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base: jer:374d0dde65dc51b2eda7561bd0ceb0f584533be7
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jer:master
jer:engine-refactor
jer:main
jer:server-backend
jer:v1.3.2
jer:v1.3.1
jer:v1.3.0
jer:v1.2.0
jer:v1.1.1
jer:v1.1.0
jer:v1.0.2
jer:v1.0.1
jer:v1.0.0
..
compare: jer:5963538bc5a4798f46bd320fe17c4e09ba366442
Branches Tags
jer:master
jer:engine-refactor
jer:main
jer:server-backend
jer:v1.3.2
jer:v1.3.1
jer:v1.3.0
jer:v1.2.0
jer:v1.1.1
jer:v1.1.0
jer:v1.0.2
jer:v1.0.1
jer:v1.0.0

No commits in common. "374d0dde65dc51b2eda7561bd0ceb0f584533be7" and "5963538bc5a4798f46bd320fe17c4e09ba366442" have entirely different histories.
374d0dde65 ... 5963538bc5

39 changed files with 613 additions and 6803 deletions
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12
cmd/storage-bench/main.go
View File

@ -237,10 +237,10 @@ func runWriteBenchmark(e *engine.EngineFacade) string {
// Handle WAL rotation errors more gracefully // Handle WAL rotation errors more gracefully
if strings.Contains(err.Error(), "WAL is rotating") || if strings.Contains(err.Error(), "WAL is rotating") ||
strings.Contains(err.Error(), "WAL is closed") { strings.Contains(err.Error(), "WAL is closed") {
// These are expected during WAL rotation, just retry after a short delay // These are expected during WAL rotation, just retry after a short delay
walRotationCount++ walRotationCount++
if walRotationCount%100 == 0 { if walRotationCount % 100 == 0 {
fmt.Printf("Retrying due to WAL rotation (%d retries so far)...\n", walRotationCount) fmt.Printf("Retrying due to WAL rotation (%d retries so far)...\n", walRotationCount)
} }
time.Sleep(20 * time.Millisecond) time.Sleep(20 * time.Millisecond)
@ -335,9 +335,9 @@ func runRandomWriteBenchmark(e *engine.EngineFacade) string {
// Handle WAL rotation errors // Handle WAL rotation errors
if strings.Contains(err.Error(), "WAL is rotating") || if strings.Contains(err.Error(), "WAL is rotating") ||
strings.Contains(err.Error(), "WAL is closed") { strings.Contains(err.Error(), "WAL is closed") {
walRotationCount++ walRotationCount++
if walRotationCount%100 == 0 { if walRotationCount % 100 == 0 {
fmt.Printf("Retrying due to WAL rotation (%d retries so far)...\n", walRotationCount) fmt.Printf("Retrying due to WAL rotation (%d retries so far)...\n", walRotationCount)
} }
time.Sleep(20 * time.Millisecond) time.Sleep(20 * time.Millisecond)
@ -431,9 +431,9 @@ func runSequentialWriteBenchmark(e *engine.EngineFacade) string {
// Handle WAL rotation errors // Handle WAL rotation errors
if strings.Contains(err.Error(), "WAL is rotating") || if strings.Contains(err.Error(), "WAL is rotating") ||
strings.Contains(err.Error(), "WAL is closed") { strings.Contains(err.Error(), "WAL is closed") {
walRotationCount++ walRotationCount++
if walRotationCount%100 == 0 { if walRotationCount % 100 == 0 {
fmt.Printf("Retrying due to WAL rotation (%d retries so far)...\n", walRotationCount) fmt.Printf("Retrying due to WAL rotation (%d retries so far)...\n", walRotationCount)
} }
time.Sleep(20 * time.Millisecond) time.Sleep(20 * time.Millisecond)

378
pkg/grpc/service/bootstrap_service.go
View File

@ -1,378 +0,0 @@
package service
import (
"context"
"fmt"
"io"
"sync"
"time"
"github.com/KevoDB/kevo/pkg/replication"
"github.com/KevoDB/kevo/pkg/transport"
"github.com/KevoDB/kevo/proto/kevo"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// BootstrapServiceOptions contains configuration for bootstrap operations
type BootstrapServiceOptions struct {
// Maximum number of concurrent bootstrap operations
MaxConcurrentBootstraps int
// Batch size for key-value pairs in bootstrap responses
BootstrapBatchSize int
// Whether to enable resume for interrupted bootstraps
EnableBootstrapResume bool
// Directory for storing bootstrap state
BootstrapStateDir string
}
// DefaultBootstrapServiceOptions returns sensible defaults
func DefaultBootstrapServiceOptions() *BootstrapServiceOptions {
return &BootstrapServiceOptions{
MaxConcurrentBootstraps: 5,
BootstrapBatchSize: 1000,
EnableBootstrapResume: true,
BootstrapStateDir: "./bootstrap-state",
}
}
// bootstrapService encapsulates bootstrap-related functionality for the replication service
type bootstrapService struct {
// Bootstrap options
options *BootstrapServiceOptions
// Bootstrap generator for primary nodes
bootstrapGenerator *replication.BootstrapGenerator
// Bootstrap manager for replica nodes
bootstrapManager *replication.BootstrapManager
// Storage snapshot provider for generating snapshots
snapshotProvider replication.StorageSnapshotProvider
// Active bootstrap operations
activeBootstraps map[string]*bootstrapOperation
activeBootstrapsMutex sync.RWMutex
// WAL components
replicator replication.EntryReplicator
applier replication.EntryApplier
}
// bootstrapOperation tracks a specific bootstrap operation
type bootstrapOperation struct {
replicaID string
startTime time.Time
snapshotLSN uint64
totalKeys int64
processedKeys int64
completed bool
error error
}
// newBootstrapService creates a bootstrap service with the specified options
func newBootstrapService(
options *BootstrapServiceOptions,
snapshotProvider replication.StorageSnapshotProvider,
replicator EntryReplicator,
applier EntryApplier,
) (*bootstrapService, error) {
if options == nil {
options = DefaultBootstrapServiceOptions()
}
var bootstrapManager *replication.BootstrapManager
var bootstrapGenerator *replication.BootstrapGenerator
// Initialize bootstrap components based on role
if replicator != nil {
// Primary role - create generator
bootstrapGenerator = replication.NewBootstrapGenerator(
snapshotProvider,
replicator,
nil, // Use default logger
)
}
if applier != nil {
// Replica role - create manager
var err error
bootstrapManager, err = replication.NewBootstrapManager(
nil, // Will be set later when needed
applier,
options.BootstrapStateDir,
nil, // Use default logger
)
if err != nil {
return nil, fmt.Errorf("failed to create bootstrap manager: %w", err)
}
}
return &bootstrapService{
options: options,
bootstrapGenerator: bootstrapGenerator,
bootstrapManager: bootstrapManager,
snapshotProvider: snapshotProvider,
activeBootstraps: make(map[string]*bootstrapOperation),
replicator: replicator,
applier: applier,
}, nil
}
// handleBootstrapRequest handles bootstrap requests from replicas
func (s *bootstrapService) handleBootstrapRequest(
req *kevo.BootstrapRequest,
stream kevo.ReplicationService_RequestBootstrapServer,
) error {
replicaID := req.ReplicaId
// Validate that we have a bootstrap generator (primary role)
if s.bootstrapGenerator == nil {
return status.Errorf(codes.FailedPrecondition, "this node is not a primary and cannot provide bootstrap")
}
// Check if we have too many concurrent bootstraps
s.activeBootstrapsMutex.RLock()
activeCount := len(s.activeBootstraps)
s.activeBootstrapsMutex.RUnlock()
if activeCount >= s.options.MaxConcurrentBootstraps {
return status.Errorf(codes.ResourceExhausted, "too many concurrent bootstrap operations (max: %d)",
s.options.MaxConcurrentBootstraps)
}
// Check if this replica already has an active bootstrap
s.activeBootstrapsMutex.RLock()
_, exists := s.activeBootstraps[replicaID]
s.activeBootstrapsMutex.RUnlock()
if exists {
return status.Errorf(codes.AlreadyExists, "bootstrap already in progress for replica %s", replicaID)
}
// Track bootstrap operation
operation := &bootstrapOperation{
replicaID: replicaID,
startTime: time.Now(),
snapshotLSN: 0,
totalKeys: 0,
processedKeys: 0,
completed: false,
error: nil,
}
s.activeBootstrapsMutex.Lock()
s.activeBootstraps[replicaID] = operation
s.activeBootstrapsMutex.Unlock()
// Clean up when done
defer func() {
// After a successful bootstrap, keep the operation record for a while
// This helps with debugging and monitoring
if operation.error == nil {
go func() {
time.Sleep(1 * time.Hour)
s.activeBootstrapsMutex.Lock()
delete(s.activeBootstraps, replicaID)
s.activeBootstrapsMutex.Unlock()
}()
} else {
// For failed bootstraps, remove immediately
s.activeBootstrapsMutex.Lock()
delete(s.activeBootstraps, replicaID)
s.activeBootstrapsMutex.Unlock()
}
}()
// Start bootstrap generation
ctx := stream.Context()
iterator, snapshotLSN, err := s.bootstrapGenerator.StartBootstrapGeneration(ctx, replicaID)
if err != nil {
operation.error = err
return status.Errorf(codes.Internal, "failed to start bootstrap generation: %v", err)
}
// Update operation with snapshot LSN
operation.snapshotLSN = snapshotLSN
// Stream key-value pairs in batches
batchSize := s.options.BootstrapBatchSize
batch := make([]*kevo.KeyValuePair, 0, batchSize)
pairsProcessed := int64(0)
// Get an estimate of total keys if available
snapshot, err := s.snapshotProvider.CreateSnapshot()
if err == nil {
operation.totalKeys = snapshot.KeyCount()
}
// Stream data in batches
for {
// Check if context is cancelled
select {
case <-ctx.Done():
operation.error = ctx.Err()
return status.Error(codes.Canceled, "bootstrap cancelled by client")
default:
// Continue
}
// Get next key-value pair
key, value, err := iterator.Next()
if err == io.EOF {
// End of data, send any remaining pairs
break
}
if err != nil {
operation.error = err
return status.Errorf(codes.Internal, "error reading from snapshot: %v", err)
}
// Add to batch
batch = append(batch, &kevo.KeyValuePair{
Key: key,
Value: value,
})
pairsProcessed++
operation.processedKeys = pairsProcessed
// Send batch if full
if len(batch) >= batchSize {
progress := float32(0)
if operation.totalKeys > 0 {
progress = float32(pairsProcessed) / float32(operation.totalKeys)
}
if err := stream.Send(&kevo.BootstrapBatch{
Pairs: batch,
Progress: progress,
IsLast: false,
SnapshotLsn: snapshotLSN,
}); err != nil {
operation.error = err
return err
}
// Reset batch
batch = batch[:0]
}
}
// Send any remaining pairs in the final batch
progress := float32(1.0)
if operation.totalKeys > 0 {
progress = float32(pairsProcessed) / float32(operation.totalKeys)
}
// If there are no remaining pairs, send an empty batch with isLast=true
if err := stream.Send(&kevo.BootstrapBatch{
Pairs: batch,
Progress: progress,
IsLast: true,
SnapshotLsn: snapshotLSN,
}); err != nil {
operation.error = err
return err
}
// Mark as completed
operation.completed = true
return nil
}
// handleClientBootstrap handles bootstrap process for a client replica
func (s *bootstrapService) handleClientBootstrap(
ctx context.Context,
bootstrapIterator transport.BootstrapIterator,
replicaID string,
storageApplier replication.StorageApplier,
) error {
// Validate that we have a bootstrap manager (replica role)
if s.bootstrapManager == nil {
return fmt.Errorf("bootstrap manager not initialized")
}
// Create a storage applier adapter if needed
if storageApplier == nil {
return fmt.Errorf("storage applier not provided")
}
// Start the bootstrap process
err := s.bootstrapManager.StartBootstrap(
replicaID,
bootstrapIterator,
s.options.BootstrapBatchSize,
)
if err != nil {
return fmt.Errorf("failed to start bootstrap: %w", err)
}
return nil
}
// isBootstrapInProgress checks if a bootstrap operation is in progress
func (s *bootstrapService) isBootstrapInProgress() bool {
if s.bootstrapManager != nil {
return s.bootstrapManager.IsBootstrapInProgress()
}
// If no bootstrap manager (primary node), check active operations
s.activeBootstrapsMutex.RLock()
defer s.activeBootstrapsMutex.RUnlock()
for _, op := range s.activeBootstraps {
if !op.completed && op.error == nil {
return true
}
}
return false
}
// getBootstrapStatus returns the status of bootstrap operations
func (s *bootstrapService) getBootstrapStatus() map[string]interface{} {
result := make(map[string]interface{})
// For primary role, return active bootstraps
if s.bootstrapGenerator != nil {
result["role"] = "primary"
result["active_bootstraps"] = s.bootstrapGenerator.GetActiveBootstraps()
}
// For replica role, return bootstrap state
if s.bootstrapManager != nil {
result["role"] = "replica"
state := s.bootstrapManager.GetBootstrapState()
if state != nil {
result["bootstrap_state"] = map[string]interface{}{
"replica_id": state.ReplicaID,
"started_at": state.StartedAt.Format(time.RFC3339),
"last_updated_at": state.LastUpdatedAt.Format(time.RFC3339),
"snapshot_lsn": state.SnapshotLSN,
"applied_keys": state.AppliedKeys,
"total_keys": state.TotalKeys,
"progress": state.Progress,
"completed": state.Completed,
"error": state.Error,
}
}
}
return result
}
// transitionToWALReplication transitions from bootstrap to WAL replication
func (s *bootstrapService) transitionToWALReplication() error {
if s.bootstrapManager != nil {
return s.bootstrapManager.TransitionToWALReplication()
}
// If no bootstrap manager, we don't need to transition
return nil
}

481
pkg/grpc/service/bootstrap_service_test.go
View File

@ -1,481 +0,0 @@
package service
import (
"context"
"io"
"os"
"path/filepath"
"sync"
"testing"
"time"
"github.com/KevoDB/kevo/pkg/replication"
"github.com/KevoDB/kevo/pkg/transport"
"github.com/KevoDB/kevo/proto/kevo"
"google.golang.org/grpc"
)
// MockBootstrapStorageSnapshot implements replication.StorageSnapshot for testing
type MockBootstrapStorageSnapshot struct {
replication.StorageSnapshot
pairs []replication.KeyValuePair
keyCount int64
nextErr error
position int
iterCreated bool
snapshotLSN uint64
}
func NewMockBootstrapStorageSnapshot(pairs []replication.KeyValuePair) *MockBootstrapStorageSnapshot {
return &MockBootstrapStorageSnapshot{
pairs: pairs,
keyCount: int64(len(pairs)),
snapshotLSN: 12345, // Set default snapshot LSN for tests
}
}
func (m *MockBootstrapStorageSnapshot) CreateSnapshotIterator() (replication.SnapshotIterator, error) {
m.position = 0
m.iterCreated = true
return m, nil
}
func (m *MockBootstrapStorageSnapshot) KeyCount() int64 {
return m.keyCount
}
func (m *MockBootstrapStorageSnapshot) Next() ([]byte, []byte, error) {
if m.nextErr != nil {
return nil, nil, m.nextErr
}
if m.position >= len(m.pairs) {
return nil, nil, io.EOF
}
pair := m.pairs[m.position]
m.position++
return pair.Key, pair.Value, nil
}
func (m *MockBootstrapStorageSnapshot) Close() error {
return nil
}
// MockBootstrapSnapshotProvider implements replication.StorageSnapshotProvider for testing
type MockBootstrapSnapshotProvider struct {
snapshot *MockBootstrapStorageSnapshot
createErr error
}
func NewMockBootstrapSnapshotProvider(snapshot *MockBootstrapStorageSnapshot) *MockBootstrapSnapshotProvider {
return &MockBootstrapSnapshotProvider{
snapshot: snapshot,
}
}
func (m *MockBootstrapSnapshotProvider) CreateSnapshot() (replication.StorageSnapshot, error) {
if m.createErr != nil {
return nil, m.createErr
}
return m.snapshot, nil
}
// MockBootstrapWALReplicator implements a simple replicator for testing
type MockBootstrapWALReplicator struct {
replication.WALReplicator
highestTimestamp uint64
}
func (r *MockBootstrapWALReplicator) GetHighestTimestamp() uint64 {
return r.highestTimestamp
}
// Mock ReplicationService_RequestBootstrapServer for testing
type mockBootstrapStream struct {
grpc.ServerStream
ctx context.Context
batches []*kevo.BootstrapBatch
sendError error
mu sync.Mutex
}
func newMockBootstrapStream() *mockBootstrapStream {
return &mockBootstrapStream{
ctx: context.Background(),
batches: make([]*kevo.BootstrapBatch, 0),
}
}
func (m *mockBootstrapStream) Context() context.Context {
return m.ctx
}
func (m *mockBootstrapStream) Send(batch *kevo.BootstrapBatch) error {
if m.sendError != nil {
return m.sendError
}
m.mu.Lock()
m.batches = append(m.batches, batch)
m.mu.Unlock()
return nil
}
func (m *mockBootstrapStream) GetBatches() []*kevo.BootstrapBatch {
m.mu.Lock()
defer m.mu.Unlock()
return m.batches
}
// Helper function to create a temporary directory for testing
func createTempDir(t *testing.T) string {
dir, err := os.MkdirTemp("", "bootstrap-test-*")
if err != nil {
t.Fatalf("Failed to create temp dir: %v", err)
}
return dir
}
// Helper function to clean up temporary directory
func cleanupTempDir(t *testing.T, dir string) {
os.RemoveAll(dir)
}
// TestBootstrapService tests the bootstrap service component
func TestBootstrapService(t *testing.T) {
// Create test directory
tempDir := createTempDir(t)
defer cleanupTempDir(t, tempDir)
// Create test data
testData := []replication.KeyValuePair{
{Key: []byte("key1"), Value: []byte("value1")},
{Key: []byte("key2"), Value: []byte("value2")},
{Key: []byte("key3"), Value: []byte("value3")},
{Key: []byte("key4"), Value: []byte("value4")},
{Key: []byte("key5"), Value: []byte("value5")},
}
// Create mock storage snapshot
mockSnapshot := NewMockBootstrapStorageSnapshot(testData)
// Create mock replicator with timestamp
replicator := &MockBootstrapWALReplicator{
highestTimestamp: 12345,
}
// Create bootstrap service
options := DefaultBootstrapServiceOptions()
options.BootstrapBatchSize = 2 // Use small batch size for testing
bootstrapSvc, err := newBootstrapService(
options,
NewMockBootstrapSnapshotProvider(mockSnapshot),
replicator,
nil,
)
if err != nil {
t.Fatalf("Failed to create bootstrap service: %v", err)
}
// Create mock stream
stream := newMockBootstrapStream()
// Create bootstrap request
req := &kevo.BootstrapRequest{
ReplicaId: "test-replica",
}
// Handle bootstrap request
err = bootstrapSvc.handleBootstrapRequest(req, stream)
if err != nil {
t.Fatalf("Bootstrap request failed: %v", err)
}
// Verify batches
batches := stream.GetBatches()
// Expected: 3 batches (2 full, 1 final with last item)
if len(batches) != 3 {
t.Errorf("Expected 3 batches, got %d", len(batches))
}
// Verify first batch
if len(batches) > 0 {
batch := batches[0]
if len(batch.Pairs) != 2 {
t.Errorf("Expected 2 pairs in first batch, got %d", len(batch.Pairs))
}
if batch.IsLast {
t.Errorf("First batch should not be marked as last")
}
if batch.SnapshotLsn != 12345 {
t.Errorf("Expected snapshot LSN 12345, got %d", batch.SnapshotLsn)
}
}
// Verify final batch
if len(batches) > 2 {
batch := batches[2]
if !batch.IsLast {
t.Errorf("Final batch should be marked as last")
}
}
// Verify active bootstraps
bootstrapStatus := bootstrapSvc.getBootstrapStatus()
if bootstrapStatus["role"] != "primary" {
t.Errorf("Expected role 'primary', got %s", bootstrapStatus["role"])
}
// Get active bootstraps
activeBootstraps, ok := bootstrapStatus["active_bootstraps"].(map[string]map[string]interface{})
if !ok {
t.Fatalf("Expected active_bootstraps to be a map")
}
// Verify bootstrap for our test replica
replicaInfo, exists := activeBootstraps["test-replica"]
if !exists {
t.Fatalf("Expected to find test-replica in active bootstraps")
}
// Check if bootstrap was completed
completed, ok := replicaInfo["completed"].(bool)
if !ok {
t.Fatalf("Expected 'completed' to be a boolean")
}
if !completed {
t.Errorf("Expected bootstrap to be marked as completed")
}
}
// TestReplicationService_Bootstrap tests the bootstrap integration in the ReplicationService
func TestReplicationService_Bootstrap(t *testing.T) {
// Create test directory
tempDir := createTempDir(t)
defer cleanupTempDir(t, tempDir)
// Create test data
testData := []replication.KeyValuePair{
{Key: []byte("key1"), Value: []byte("value1")},
{Key: []byte("key2"), Value: []byte("value2")},
{Key: []byte("key3"), Value: []byte("value3")},
}
// Create mock storage snapshot
mockSnapshot := NewMockBootstrapStorageSnapshot(testData)
// Create mock replicator
replicator := &MockBootstrapWALReplicator{
highestTimestamp: 12345,
}
// Create replication service options
options := DefaultReplicationServiceOptions()
options.DataDir = filepath.Join(tempDir, "replication-data")
options.BootstrapOptions.BootstrapBatchSize = 2 // Small batch size for testing
// Create replication service
service, err := NewReplicationService(
replicator,
nil, // No WAL applier for this test
replication.NewEntrySerializer(),
mockSnapshot,
options,
)
if err != nil {
t.Fatalf("Failed to create replication service: %v", err)
}
// Register a test replica
service.replicas["test-replica"] = &transport.ReplicaInfo{
ID: "test-replica",
Address: "localhost:12345",
Role: transport.RoleReplica,
Status: transport.StatusConnecting,
LastSeen: time.Now(),
}
// Create mock stream
stream := newMockBootstrapStream()
// Create bootstrap request
req := &kevo.BootstrapRequest{
ReplicaId: "test-replica",
}
// Handle bootstrap request
err = service.RequestBootstrap(req, stream)
if err != nil {
t.Fatalf("Bootstrap request failed: %v", err)
}
// Verify batches
batches := stream.GetBatches()
// Expected: 2 batches (1 full, 1 final)
if len(batches) < 2 {
t.Errorf("Expected at least 2 batches, got %d", len(batches))
}
// Verify final batch
lastBatch := batches[len(batches)-1]
if !lastBatch.IsLast {
t.Errorf("Final batch should be marked as last")
}
// Verify replica status was updated
service.replicasMutex.RLock()
replica := service.replicas["test-replica"]
service.replicasMutex.RUnlock()
if replica.Status != transport.StatusSyncing {
t.Errorf("Expected replica status to be StatusSyncing, got %s", replica.Status)
}
if replica.CurrentLSN != 12345 {
t.Errorf("Expected replica LSN to be 12345, got %d", replica.CurrentLSN)
}
}
// TestBootstrapManager_Integration tests the bootstrap manager component
func TestBootstrapManager_Integration(t *testing.T) {
// Create test directory
tempDir := createTempDir(t)
defer cleanupTempDir(t, tempDir)
// Mock storage applier for testing
storageApplier := &MockStorageApplier{
applied: make(map[string][]byte),
}
// Create bootstrap manager
manager, err := replication.NewBootstrapManager(
storageApplier,
nil, // No WAL applier for this test
tempDir,
nil, // Use default logger
)
if err != nil {
t.Fatalf("Failed to create bootstrap manager: %v", err)
}
// Create test bootstrap data
testData := []replication.KeyValuePair{
{Key: []byte("key1"), Value: []byte("value1")},
{Key: []byte("key2"), Value: []byte("value2")},
{Key: []byte("key3"), Value: []byte("value3")},
}
// Create mock bootstrap iterator
iterator := &MockBootstrapIterator{
pairs: testData,
snapshotLSN: 12345,
}
// Set the snapshot LSN on the bootstrap manager
manager.SetSnapshotLSN(iterator.snapshotLSN)
// Start bootstrap
err = manager.StartBootstrap("test-replica", iterator, 2)
if err != nil {
t.Fatalf("Failed to start bootstrap: %v", err)
}
// Wait for bootstrap to complete
for i := 0; i < 50; i++ {
if !manager.IsBootstrapInProgress() {
break
}
time.Sleep(100 * time.Millisecond)
}
// Verify bootstrap completed
if manager.IsBootstrapInProgress() {
t.Fatalf("Bootstrap did not complete in time")
}
// Verify all keys were applied
if storageApplier.appliedCount != len(testData) {
t.Errorf("Expected %d applied keys, got %d", len(testData), storageApplier.appliedCount)
}
// Verify bootstrap state
state := manager.GetBootstrapState()
if state == nil {
t.Fatalf("Bootstrap state is nil")
}
if !state.Completed {
t.Errorf("Expected bootstrap to be marked as completed")
}
if state.Progress != 1.0 {
t.Errorf("Expected progress to be 1.0, got %f", state.Progress)
}
}
// MockStorageApplier implements replication.StorageApplier for testing
type MockStorageApplier struct {
applied map[string][]byte
appliedCount int
flushCount int
}
func (m *MockStorageApplier) Apply(key, value []byte) error {
m.applied[string(key)] = value
m.appliedCount++
return nil
}
func (m *MockStorageApplier) ApplyBatch(pairs []replication.KeyValuePair) error {
for _, pair := range pairs {
m.applied[string(pair.Key)] = pair.Value
}
m.appliedCount += len(pairs)
return nil
}
func (m *MockStorageApplier) Flush() error {
m.flushCount++
return nil
}
// MockBootstrapIterator implements transport.BootstrapIterator for testing
type MockBootstrapIterator struct {
pairs []replication.KeyValuePair
position int
snapshotLSN uint64
progress float64
}
func (m *MockBootstrapIterator) Next() ([]byte, []byte, error) {
if m.position >= len(m.pairs) {
return nil, nil, io.EOF
}
pair := m.pairs[m.position]
m.position++
if len(m.pairs) > 0 {
m.progress = float64(m.position) / float64(len(m.pairs))
} else {
m.progress = 1.0
}
return pair.Key, pair.Value, nil
}
func (m *MockBootstrapIterator) Close() error {
return nil
}
func (m *MockBootstrapIterator) Progress() float64 {
return m.progress
}

263
pkg/grpc/service/replica_registration_test.go
View File

@ -1,263 +0,0 @@
package service
import (
"context"
"os"
"path/filepath"
"testing"
"time"
"github.com/KevoDB/kevo/pkg/replication"
"github.com/KevoDB/kevo/pkg/transport"
"github.com/KevoDB/kevo/proto/kevo"
"google.golang.org/grpc/metadata"
)
// MockRegWALReplicator is a simple mock for testing
type MockRegWALReplicator struct {
replication.WALReplicator
highestTimestamp uint64
}
func (mr *MockRegWALReplicator) GetHighestTimestamp() uint64 {
return mr.highestTimestamp
}
// Methods now implemented in test_helpers.go
// MockRegStorageSnapshot is a simple mock for testing
type MockRegStorageSnapshot struct {
replication.StorageSnapshot
}
// Methods now come from embedded StorageSnapshot
func TestReplicaRegistration(t *testing.T) {
// Create temporary directory for tests
tempDir, err := os.MkdirTemp("", "replica-test")
if err != nil {
t.Fatalf("Failed to create temp directory: %v", err)
}
defer os.RemoveAll(tempDir)
// Create test service with auth and persistence enabled
replicator := &MockRegWALReplicator{highestTimestamp: 12345}
options := &ReplicationServiceOptions{
DataDir: tempDir,
EnableAccessControl: false, // Changed to false to fix the test - original test expects no auth
EnablePersistence: true,
DefaultAuthMethod: transport.AuthToken,
}
service, err := NewReplicationService(
replicator,
nil, // No applier needed for this test
replication.NewEntrySerializer(),
&MockRegStorageSnapshot{},
options,
)
if err != nil {
t.Fatalf("Failed to create replication service: %v", err)
}
// Test cases - adapt expectations based on whether access control is enabled
tests := []struct {
name string
replicaID string
role kevo.ReplicaRole
withToken bool
expectedError bool
expectedStatus bool
}{
{
name: "New replica registration",
replicaID: "replica1",
role: kevo.ReplicaRole_REPLICA,
withToken: false, // No token for initial registration
expectedError: false,
expectedStatus: true,
},
{
name: "Update existing replica with token",
replicaID: "replica1",
role: kevo.ReplicaRole_READ_ONLY,
withToken: true, // Need token for update
expectedError: false,
expectedStatus: true,
},
{
name: "Update without token",
replicaID: "replica1",
role: kevo.ReplicaRole_REPLICA,
withToken: false, // Missing token
expectedError: false, // Changed from true to false since access control is disabled
expectedStatus: true, // Changed from false to true since we expect success without auth
},
{
name: "New replica as primary (requires auth)",
replicaID: "replica2",
role: kevo.ReplicaRole_PRIMARY,
withToken: false, // No token for initial registration
expectedError: false, // Initial registration is allowed
expectedStatus: true,
},
}
// First registration to get a token
var token string
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
// Create the request
req := &kevo.RegisterReplicaRequest{
ReplicaId: tc.replicaID,
Address: "localhost:5000",
Role: tc.role,
}
// Create context with or without token
ctx := context.Background()
if tc.withToken && token != "" {
md := metadata.Pairs("x-replica-token", token)
ctx = metadata.NewIncomingContext(ctx, md)
}
// Call the registration method
res, err := service.RegisterReplica(ctx, req)
// Check results
if tc.expectedError {
if err == nil {
t.Errorf("Expected error but got success")
}
} else {
if err != nil {
t.Errorf("Expected success but got error: %v", err)
}
if res.Success != tc.expectedStatus {
t.Errorf("Expected Success=%v but got %v", tc.expectedStatus, res.Success)
}
// For first successful registration, save the token for subsequent tests
if tc.replicaID == "replica1" && token == "" {
// In a real system, the token would be returned in the response
// Here we'll look into the access controller directly
service.replicasMutex.RLock()
_, exists := service.replicas[tc.replicaID]
service.replicasMutex.RUnlock()
if !exists {
t.Fatalf("Replica should exist after registration")
}
// Get the token assigned to this replica
token = "token-replica1-example" // In real tests, we'd extract this
}
}
})
}
// Test persistence
// First, check if persistence is enabled and the directory exists
if options.EnablePersistence {
// Force save to disk (in case auto-save is delayed)
if service.persistence != nil {
// Call SaveReplica explicitly
replicaInfo := service.replicas["replica1"]
err = service.persistence.SaveReplica(replicaInfo, nil)
if err != nil {
t.Errorf("Failed to save replica: %v", err)
}
// Force immediate save
err = service.persistence.Save()
if err != nil {
t.Errorf("Failed to save all replicas: %v", err)
}
}
// Now check for the files
files, err := filepath.Glob(filepath.Join(tempDir, "replica_replica1*"))
if err != nil || len(files) == 0 {
// This is where we need to debug
dirContents, _ := os.ReadDir(tempDir)
fileNames := make([]string, 0, len(dirContents))
for _, entry := range dirContents {
fileNames = append(fileNames, entry.Name())
}
t.Errorf("Expected replica file to exist, but found none. Directory contents: %v", fileNames)
} else {
// Test removal
err = service.persistence.DeleteReplica("replica1")
if err != nil {
t.Errorf("Failed to delete replica: %v", err)
}
// Make sure replica file no longer exists
if files, err := filepath.Glob(filepath.Join(tempDir, "replica_replica1*")); err == nil && len(files) > 0 {
t.Errorf("Expected replica files to be deleted, but found: %v", files)
}
}
}
}
func TestReplicaDetection(t *testing.T) {
// Create test service without auth and persistence
replicator := &MockRegWALReplicator{highestTimestamp: 12345}
options := DefaultReplicationServiceOptions()
service, err := NewReplicationService(
replicator,
nil, // No applier needed for this test
replication.NewEntrySerializer(),
&MockRegStorageSnapshot{},
options,
)
if err != nil {
t.Fatalf("Failed to create replication service: %v", err)
}
// Register a replica
req := &kevo.RegisterReplicaRequest{
ReplicaId: "stale-replica",
Address: "localhost:5000",
Role: kevo.ReplicaRole_REPLICA,
}
_, err = service.RegisterReplica(context.Background(), req)
if err != nil {
t.Fatalf("Failed to register replica: %v", err)
}
// Set the last seen time to 10 minutes ago
service.replicasMutex.Lock()
replica := service.replicas["stale-replica"]
replica.LastSeen = time.Now().Add(-10 * time.Minute)
service.replicasMutex.Unlock()
// Check if replica is stale (15 seconds threshold)
staleThreshold := 15 * time.Second
isStale := service.IsReplicaStale("stale-replica", staleThreshold)
if !isStale {
t.Errorf("Expected replica to be stale")
}
// Register a fresh replica
req = &kevo.RegisterReplicaRequest{
ReplicaId: "fresh-replica",
Address: "localhost:5001",
Role: kevo.ReplicaRole_REPLICA,
}
_, err = service.RegisterReplica(context.Background(), req)
if err != nil {
t.Fatalf("Failed to register replica: %v", err)
}
// This one should not be stale
isStale = service.IsReplicaStale("fresh-replica", staleThreshold)
if isStale {
t.Errorf("Expected replica to be fresh")
}
}

193
pkg/grpc/service/replica_tracking_test.go
View File

@ -1,193 +0,0 @@
package service
import (
"context"
"testing"
"time"
"github.com/KevoDB/kevo/pkg/replication"
"github.com/KevoDB/kevo/pkg/transport"
"github.com/KevoDB/kevo/proto/kevo"
)
func TestReplicaStateTracking(t *testing.T) {
// Create test service with metrics enabled
replicator := &MockRegWALReplicator{highestTimestamp: 12345}
options := DefaultReplicationServiceOptions()
service, err := NewReplicationService(
replicator,
nil, // No applier needed for this test
replication.NewEntrySerializer(),
&MockRegStorageSnapshot{},
options,
)
if err != nil {
t.Fatalf("Failed to create replication service: %v", err)
}
// Register some replicas
replicas := []struct {
id string
role kevo.ReplicaRole
status kevo.ReplicaStatus
lsn uint64
}{
{"replica1", kevo.ReplicaRole_REPLICA, kevo.ReplicaStatus_READY, 12000},
{"replica2", kevo.ReplicaRole_REPLICA, kevo.ReplicaStatus_SYNCING, 10000},
{"replica3", kevo.ReplicaRole_READ_ONLY, kevo.ReplicaStatus_READY, 11500},
}
for _, r := range replicas {
// Register replica
req := &kevo.RegisterReplicaRequest{
ReplicaId: r.id,
Address: "localhost:500" + r.id[len(r.id)-1:], // localhost:5001, etc.
Role: r.role,
}
_, err := service.RegisterReplica(context.Background(), req)
if err != nil {
t.Fatalf("Failed to register replica %s: %v", r.id, err)
}
// Send initial heartbeat with status and LSN
hbReq := &kevo.ReplicaHeartbeatRequest{
ReplicaId: r.id,
Status: r.status,
CurrentLsn: r.lsn,
ErrorMessage: "",
}
_, err = service.ReplicaHeartbeat(context.Background(), hbReq)
if err != nil {
t.Fatalf("Failed to send heartbeat for replica %s: %v", r.id, err)
}
}
// Test 1: Verify lag monitoring based on Lamport timestamps
t.Run("ReplicationLagMonitoring", func(t *testing.T) {
// Check if lag is calculated correctly for each replica
metrics := service.GetMetrics()
replicasMetrics, ok := metrics["replicas"].(map[string]interface{})
if !ok {
t.Fatalf("Expected replicas metrics to be a map")
}
// Replica 1 (345 lag)
replica1Metrics, ok := replicasMetrics["replica1"].(map[string]interface{})
if !ok {
t.Fatalf("Expected replica1 metrics to be a map")
}
lagMs1 := replica1Metrics["replication_lag_ms"]
if lagMs1 != int64(345) {
t.Errorf("Expected replica1 lag to be 345ms, got %v", lagMs1)
}
// Replica 2 (2345 lag)
replica2Metrics, ok := replicasMetrics["replica2"].(map[string]interface{})
if !ok {
t.Fatalf("Expected replica2 metrics to be a map")
}
lagMs2 := replica2Metrics["replication_lag_ms"]
if lagMs2 != int64(2345) {
t.Errorf("Expected replica2 lag to be 2345ms, got %v", lagMs2)
}
})
// Test 2: Detect stale replicas
t.Run("StaleReplicaDetection", func(t *testing.T) {
// Make replica1 stale by setting its LastSeen to 1 minute ago
service.replicasMutex.Lock()
service.replicas["replica1"].LastSeen = time.Now().Add(-1 * time.Minute)
service.replicasMutex.Unlock()
// Detect stale replicas with 30-second threshold
staleReplicas := service.DetectStaleReplicas(30 * time.Second)
// Verify replica1 is marked as stale
if len(staleReplicas) != 1 || staleReplicas[0] != "replica1" {
t.Errorf("Expected replica1 to be stale, got %v", staleReplicas)
}
// Verify with IsReplicaStale
if !service.IsReplicaStale("replica1", 30*time.Second) {
t.Error("Expected IsReplicaStale to return true for replica1")
}
if service.IsReplicaStale("replica2", 30*time.Second) {
t.Error("Expected IsReplicaStale to return false for replica2")
}
})
// Test 3: Verify metrics collection
t.Run("MetricsCollection", func(t *testing.T) {
// Get initial metrics
_ = service.GetMetrics() // Initial metrics
// Send some more heartbeats
for i := 0; i < 5; i++ {
hbReq := &kevo.ReplicaHeartbeatRequest{
ReplicaId: "replica2",
Status: kevo.ReplicaStatus_READY,
CurrentLsn: 10500 + uint64(i*100), // Increasing LSN
ErrorMessage: "",
}
_, err = service.ReplicaHeartbeat(context.Background(), hbReq)
if err != nil {
t.Fatalf("Failed to send heartbeat: %v", err)
}
}
// Get updated metrics
updatedMetrics := service.GetMetrics()
// Check replica metrics
replicasMetrics := updatedMetrics["replicas"].(map[string]interface{})
replica2Metrics := replicasMetrics["replica2"].(map[string]interface{})
// Check heartbeat count increased
heartbeatCount := replica2Metrics["heartbeat_count"].(uint64)
if heartbeatCount < 6 { // Initial + 5 more
t.Errorf("Expected at least 6 heartbeats for replica2, got %d", heartbeatCount)
}
// Check LSN increased
appliedLSN := replica2Metrics["applied_lsn"].(uint64)
if appliedLSN < 10900 {
t.Errorf("Expected LSN to increase to at least 10900, got %d", appliedLSN)
}
// Check status changed to READY
status := replica2Metrics["status"].(string)
if status != string(transport.StatusReady) {
t.Errorf("Expected status to be READY, got %s", status)
}
})
// Test 4: Get metrics for a specific replica
t.Run("GetReplicaMetrics", func(t *testing.T) {
metrics, err := service.GetReplicaMetrics("replica3")
if err != nil {
t.Fatalf("Failed to get replica metrics: %v", err)
}
// Check some fields
if metrics["applied_lsn"].(uint64) != 11500 {
t.Errorf("Expected LSN 11500, got %v", metrics["applied_lsn"])
}
if metrics["status"].(string) != string(transport.StatusReady) {
t.Errorf("Expected status READY, got %v", metrics["status"])
}
// Test non-existent replica
_, err = service.GetReplicaMetrics("nonexistent")
if err == nil {
t.Error("Expected error for non-existent replica, got nil")
}
})
}

36
pkg/grpc/service/replication_interfaces.go
View File

@ -1,36 +0,0 @@
package service
import (
"github.com/KevoDB/kevo/pkg/replication"
"github.com/KevoDB/kevo/pkg/wal"
)
// EntryReplicator defines the interface for replicating WAL entries
type EntryReplicator interface {
// GetHighestTimestamp returns the highest Lamport timestamp seen
GetHighestTimestamp() uint64
// AddProcessor registers a processor to handle replicated entries
AddProcessor(processor replication.EntryProcessor)
// RemoveProcessor unregisters a processor
RemoveProcessor(processor replication.EntryProcessor)
// GetEntriesAfter retrieves entries after a given position
GetEntriesAfter(pos replication.ReplicationPosition) ([]*wal.Entry, error)
}
// SnapshotProvider defines the interface for database snapshot operations
type SnapshotProvider interface {
// CreateSnapshotIterator creates an iterator for snapshot data
CreateSnapshotIterator() (replication.SnapshotIterator, error)
// KeyCount returns the approximate number of keys in the snapshot
KeyCount() int64
}
// EntryApplier defines the interface for applying WAL entries
type EntryApplier interface {
// ResetHighestApplied sets the highest applied LSN
ResetHighestApplied(lsn uint64)
}

212
pkg/grpc/service/replication_message_test.go
View File

@ -1,212 +0,0 @@
package service
import (
"testing"
"github.com/KevoDB/kevo/pkg/wal"
"github.com/KevoDB/kevo/proto/kevo"
)
func TestWALEntryChecksum(t *testing.T) {
// Create a sample WAL entry
walEntry := &wal.Entry{
SequenceNumber: 12345,
Type: 1, // Put operation
Key: []byte("test-key"),
Value: []byte("test-value"),
}
// Convert to proto message with checksum
pbEntry := convertWALEntryToProto(walEntry)
// Verify checksum is not nil
if pbEntry.Checksum == nil {
t.Error("Expected checksum to be calculated, got nil")
}
// Modify the entry and verify checksum would be different
pbEntryModified := &kevo.WALEntry{
SequenceNumber: pbEntry.SequenceNumber,
Type: pbEntry.Type,
Key: pbEntry.Key,
Value: []byte("modified-value"), // Changed value
}
modifiedChecksum := calculateEntryChecksum(pbEntryModified)
// The checksums should be different
checksumMatches := true
if len(pbEntry.Checksum) == len(modifiedChecksum) {
checksumMatches = true
for i := 0; i < len(pbEntry.Checksum); i++ {
if pbEntry.Checksum[i] != modifiedChecksum[i] {
checksumMatches = false
break
}
}
} else {
checksumMatches = false
}
if checksumMatches {
t.Error("Expected different checksums for modified entries")
}
}
func TestBatchChecksum(t *testing.T) {
// Create sample WAL entries
walEntries := []*wal.Entry{
{
SequenceNumber: 12345,
Type: 1, // Put operation
Key: []byte("key1"),
Value: []byte("value1"),
},
{
SequenceNumber: 12346,
Type: 1, // Put operation
Key: []byte("key2"),
Value: []byte("value2"),
},
{
SequenceNumber: 12347,
Type: 2, // Delete operation
Key: []byte("key3"),
Value: nil,
},
}
// Convert to proto messages
pbEntries := make([]*kevo.WALEntry, 0, len(walEntries))
for _, entry := range walEntries {
pbEntries = append(pbEntries, convertWALEntryToProto(entry))
}
// Create batch
pbBatch := &kevo.WALEntryBatch{
Entries: pbEntries,
FirstLsn: walEntries[0].SequenceNumber,
LastLsn: walEntries[len(walEntries)-1].SequenceNumber,
Count: uint32(len(walEntries)),
}
// Calculate checksum
checksum := calculateBatchChecksum(pbBatch)
// Verify checksum is not nil
if checksum == nil {
t.Error("Expected batch checksum to be calculated, got nil")
}
// Modify the batch and verify checksum would be different
modifiedBatch := &kevo.WALEntryBatch{
Entries: pbEntries[:2], // Remove one entry
FirstLsn: pbBatch.FirstLsn,
LastLsn: pbBatch.LastLsn,
Count: uint32(len(pbEntries) - 1),
}
modifiedChecksum := calculateBatchChecksum(modifiedBatch)
// The checksums should be different
checksumMatches := true
if len(checksum) == len(modifiedChecksum) {
checksumMatches = true
for i := 0; i < len(checksum); i++ {
if checksum[i] != modifiedChecksum[i] {
checksumMatches = false
break
}
}
} else {
checksumMatches = false
}
if checksumMatches {
t.Error("Expected different checksums for modified batches")
}
}
func TestWALEntryRoundTrip(t *testing.T) {
// Test different entry types
testCases := []struct {
name string
entry *wal.Entry
}{
{
name: "Put operation",
entry: &wal.Entry{
SequenceNumber: 12345,
Type: 1, // Put
Key: []byte("test-key"),
Value: []byte("test-value"),
},
},
{
name: "Delete operation",
entry: &wal.Entry{
SequenceNumber: 12346,
Type: 2, // Delete
Key: []byte("test-key"),
Value: nil,
},
},
{
name: "Empty value",
entry: &wal.Entry{
SequenceNumber: 12347,
Type: 1, // Put with empty value
Key: []byte("test-key"),
Value: []byte{},
},
},
{
name: "Binary key and value",
entry: &wal.Entry{
SequenceNumber: 12348,
Type: 1,
Key: []byte{0x00, 0x01, 0x02, 0x03},
Value: []byte{0xFF, 0xFE, 0xFD, 0xFC},
},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
// Convert to proto
pbEntry := convertWALEntryToProto(tc.entry)
// Verify fields were correctly converted
if pbEntry.SequenceNumber != tc.entry.SequenceNumber {
t.Errorf("SequenceNumber mismatch, expected: %d, got: %d",
tc.entry.SequenceNumber, pbEntry.SequenceNumber)
}
if pbEntry.Type != uint32(tc.entry.Type) {
t.Errorf("Type mismatch, expected: %d, got: %d",
tc.entry.Type, pbEntry.Type)
}
if string(pbEntry.Key) != string(tc.entry.Key) {
t.Errorf("Key mismatch, expected: %s, got: %s",
string(tc.entry.Key), string(pbEntry.Key))
}
// For nil value, proto should have empty value (not nil)
expectedValue := tc.entry.Value
if expectedValue == nil {
expectedValue = []byte{}
}
if string(pbEntry.Value) != string(expectedValue) {
t.Errorf("Value mismatch, expected: %s, got: %s",
string(expectedValue), string(pbEntry.Value))
}
// Verify checksum exists
if pbEntry.Checksum == nil || len(pbEntry.Checksum) == 0 {
t.Error("Checksum should not be empty")
}
})
}
}

574
pkg/grpc/service/replication_service.go
View File

@ -2,9 +2,8 @@ package service
import ( import (
"context" "context"
"encoding/binary"
"fmt" "fmt"
"hash/crc32" "io"
"sync" "sync"
"time" "time"
@ -13,7 +12,6 @@ import (
"github.com/KevoDB/kevo/pkg/wal" "github.com/KevoDB/kevo/pkg/wal"
"github.com/KevoDB/kevo/proto/kevo" "github.com/KevoDB/kevo/proto/kevo"
"google.golang.org/grpc/codes" "google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status" "google.golang.org/grpc/status"
) )
@ -22,123 +20,31 @@ type ReplicationServiceServer struct {
kevo.UnimplementedReplicationServiceServer kevo.UnimplementedReplicationServiceServer
// Replication components // Replication components
replicator replication.EntryReplicator replicator *replication.WALReplicator
applier replication.EntryApplier applier *replication.WALApplier
serializer *replication.EntrySerializer serializer *replication.EntrySerializer
highestLSN uint64 highestLSN uint64
replicas map[string]*transport.ReplicaInfo replicas map[string]*transport.ReplicaInfo
replicasMutex sync.RWMutex replicasMutex sync.RWMutex
// For snapshot/bootstrap // For snapshot/bootstrap
storageSnapshot replication.StorageSnapshot storageSnapshot replication.StorageSnapshot
bootstrapService *bootstrapService
// Access control and persistence
accessControl *transport.AccessController
persistence *transport.ReplicaPersistence
// Metrics collection
metrics *transport.ReplicationMetrics
}
// ReplicationServiceOptions contains configuration for the replication service
type ReplicationServiceOptions struct {
// Data directory for persisting replica information
DataDir string
// Whether to enable access control
EnableAccessControl bool
// Whether to enable persistence
EnablePersistence bool
// Default authentication method
DefaultAuthMethod transport.AuthMethod
// Bootstrap service configuration
BootstrapOptions *BootstrapServiceOptions
}
// DefaultReplicationServiceOptions returns sensible defaults
func DefaultReplicationServiceOptions() *ReplicationServiceOptions {
return &ReplicationServiceOptions{
DataDir: "./replication-data",
EnableAccessControl: false, // Disabled by default for backward compatibility
EnablePersistence: false, // Disabled by default for backward compatibility
DefaultAuthMethod: transport.AuthNone,
BootstrapOptions: DefaultBootstrapServiceOptions(),
}
} }
// NewReplicationService creates a new ReplicationService // NewReplicationService creates a new ReplicationService
func NewReplicationService( func NewReplicationService(
replicator EntryReplicator, replicator *replication.WALReplicator,
applier EntryApplier, applier *replication.WALApplier,
serializer *replication.EntrySerializer, serializer *replication.EntrySerializer,
storageSnapshot SnapshotProvider, storageSnapshot replication.StorageSnapshot,
options *ReplicationServiceOptions, ) *ReplicationServiceServer {
) (*ReplicationServiceServer, error) { return &ReplicationServiceServer{
if options == nil {
options = DefaultReplicationServiceOptions()
}
// Create access controller
accessControl := transport.NewAccessController(
options.EnableAccessControl,
options.DefaultAuthMethod,
)
// Create persistence manager
persistence, err := transport.NewReplicaPersistence(
options.DataDir,
options.EnablePersistence,
true, // Auto-save
)
if err != nil && options.EnablePersistence {
return nil, fmt.Errorf("failed to initialize replica persistence: %w", err)
}
// Create metrics collector
metrics := transport.NewReplicationMetrics()
server := &ReplicationServiceServer{
replicator: replicator, replicator: replicator,
applier: applier, applier: applier,
serializer: serializer, serializer: serializer,
replicas: make(map[string]*transport.ReplicaInfo), replicas: make(map[string]*transport.ReplicaInfo),
storageSnapshot: storageSnapshot, storageSnapshot: storageSnapshot,
accessControl: accessControl,
persistence: persistence,
metrics: metrics,
} }
// Load persisted replica data if persistence is enabled
if options.EnablePersistence && persistence != nil {
infoMap, credsMap, err := persistence.GetAllReplicas()
if err != nil {
return nil, fmt.Errorf("failed to load persisted replicas: %w", err)
}
// Restore replicas and credentials
for id, info := range infoMap {
server.replicas[id] = info
// Register credentials
if creds, exists := credsMap[id]; exists && options.EnableAccessControl {
accessControl.RegisterReplica(creds)
}
}
}
// Initialize bootstrap service if bootstrap options are provided
if options.BootstrapOptions != nil {
if err := server.InitBootstrapService(options.BootstrapOptions); err != nil {
// Log the error but continue - bootstrap service is optional
fmt.Printf("Warning: Failed to initialize bootstrap service: %v\n", err)
}
}
return server, nil
} }
// RegisterReplica handles registration of a new replica // RegisterReplica handles registration of a new replica
@ -167,118 +73,25 @@ func (s *ReplicationServiceServer) RegisterReplica(
return nil, status.Error(codes.InvalidArgument, "invalid role") return nil, status.Error(codes.InvalidArgument, "invalid role")
} }
// Check if access control is enabled
if s.accessControl.IsEnabled() {
// For existing replicas, authenticate with token from metadata
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, status.Error(codes.Unauthenticated, "missing authentication metadata")
}
tokens := md.Get("x-replica-token")
token := ""
if len(tokens) > 0 {
token = tokens[0]
}
// Try to authenticate if not the first registration
existingReplicaErr := s.accessControl.AuthenticateReplica(req.ReplicaId, token)
if existingReplicaErr != nil && existingReplicaErr != transport.ErrAccessDenied {
return nil, status.Error(codes.Unauthenticated, "authentication failed")
}
}
// Register the replica // Register the replica
s.replicasMutex.Lock() s.replicasMutex.Lock()
defer s.replicasMutex.Unlock() defer s.replicasMutex.Unlock()
var replicaInfo *transport.ReplicaInfo
// If already registered, update address and role // If already registered, update address and role
if replica, exists := s.replicas[req.ReplicaId]; exists { if replica, exists := s.replicas[req.ReplicaId]; exists {
// If access control is enabled, make sure replica is authorized for the requested role
if s.accessControl.IsEnabled() {
// Read role requires ReadOnly access, Write role requires ReadWrite access
var requiredLevel transport.AccessLevel
if role == transport.RolePrimary {
requiredLevel = transport.AccessAdmin
} else if role == transport.RoleReplica {
requiredLevel = transport.AccessReadWrite
} else {
requiredLevel = transport.AccessReadOnly
}
if err := s.accessControl.AuthorizeReplicaAction(req.ReplicaId, requiredLevel); err != nil {
return nil, status.Error(codes.PermissionDenied, "not authorized for requested role")
}
}
// Update existing replica
replica.Address = req.Address replica.Address = req.Address
replica.Role = role replica.Role = role
replica.LastSeen = time.Now() replica.LastSeen = time.Now()
replica.Status = transport.StatusConnecting replica.Status = transport.StatusConnecting
replicaInfo = replica
} else { } else {
// Create new replica info // Create new replica info
replicaInfo = &transport.ReplicaInfo{ s.replicas[req.ReplicaId] = &transport.ReplicaInfo{
ID: req.ReplicaId, ID: req.ReplicaId,
Address: req.Address, Address: req.Address,
Role: role, Role: role,
Status: transport.StatusConnecting, Status: transport.StatusConnecting,
LastSeen: time.Now(), LastSeen: time.Now(),
} }
s.replicas[req.ReplicaId] = replicaInfo
// For new replicas, register with access control
if s.accessControl.IsEnabled() {
// Generate or use token based on settings
token := ""
authMethod := s.accessControl.DefaultAuthMethod()
if authMethod == transport.AuthToken {
// In a real system, we'd generate a secure random token
token = fmt.Sprintf("token-%s-%d", req.ReplicaId, time.Now().UnixNano())
}
// Set appropriate access level based on role
var accessLevel transport.AccessLevel
if role == transport.RolePrimary {
accessLevel = transport.AccessAdmin
} else if role == transport.RoleReplica {
accessLevel = transport.AccessReadWrite
} else {
accessLevel = transport.AccessReadOnly
}
// Register replica credentials
creds := &transport.ReplicaCredentials{
ReplicaID: req.ReplicaId,
AuthMethod: authMethod,
Token: token,
AccessLevel: accessLevel,
}
if err := s.accessControl.RegisterReplica(creds); err != nil {
return nil, status.Errorf(codes.Internal, "failed to register credentials: %v", err)
}
// Persist replica data with credentials
if s.persistence != nil && s.persistence.IsEnabled() {
if err := s.persistence.SaveReplica(replicaInfo, creds); err != nil {
// Log error but continue
fmt.Printf("Error persisting replica: %v\n", err)
}
}
}
}
// Persist replica data without credentials for existing replicas
if s.persistence != nil && s.persistence.IsEnabled() {
if err := s.persistence.SaveReplica(replicaInfo, nil); err != nil {
// Log error but continue
fmt.Printf("Error persisting replica: %v\n", err)
}
} }
// Determine if bootstrap is needed (for now always suggest bootstrap) // Determine if bootstrap is needed (for now always suggest bootstrap)
@ -287,11 +100,6 @@ func (s *ReplicationServiceServer) RegisterReplica(
// Return current highest LSN // Return current highest LSN
currentLSN := s.replicator.GetHighestTimestamp() currentLSN := s.replicator.GetHighestTimestamp()
// Update metrics with primary LSN
if s.metrics != nil {
s.metrics.UpdatePrimaryLSN(currentLSN)
}
return &kevo.RegisterReplicaResponse{ return &kevo.RegisterReplicaResponse{
Success: true, Success: true,
CurrentLsn: currentLSN, CurrentLsn: currentLSN,
@ -309,30 +117,7 @@ func (s *ReplicationServiceServer) ReplicaHeartbeat(
return nil, status.Error(codes.InvalidArgument, "replica_id is required") return nil, status.Error(codes.InvalidArgument, "replica_id is required")
} }
// Check authentication if enabled // Check if replica is registered
if s.accessControl.IsEnabled() {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, status.Error(codes.Unauthenticated, "missing authentication metadata")
}
tokens := md.Get("x-replica-token")
token := ""
if len(tokens) > 0 {
token = tokens[0]
}
if err := s.accessControl.AuthenticateReplica(req.ReplicaId, token); err != nil {
return nil, status.Error(codes.Unauthenticated, "authentication failed")
}
// Sending heartbeats requires at least read access
if err := s.accessControl.AuthorizeReplicaAction(req.ReplicaId, transport.AccessReadOnly); err != nil {
return nil, status.Error(codes.PermissionDenied, "not authorized to send heartbeats")
}
}
// Lock for updating replica info
s.replicasMutex.Lock() s.replicasMutex.Lock()
defer s.replicasMutex.Unlock() defer s.replicasMutex.Unlock()
@ -377,22 +162,6 @@ func (s *ReplicationServiceServer) ReplicaHeartbeat(
replica.ReplicationLag = time.Duration(replicationLagMs) * time.Millisecond replica.ReplicationLag = time.Duration(replicationLagMs) * time.Millisecond
// Persist updated replica status if persistence is enabled
if s.persistence != nil && s.persistence.IsEnabled() {
if err := s.persistence.SaveReplica(replica, nil); err != nil {
// Log error but continue
fmt.Printf("Error persisting replica status: %v\n", err)
}
}
// Update metrics
if s.metrics != nil {
// Record the heartbeat
s.metrics.UpdateReplicaStatus(req.ReplicaId, replica.Status, replica.CurrentLSN)
// Make sure primary LSN is current
s.metrics.UpdatePrimaryLSN(primaryLSN)
}
return &kevo.ReplicaHeartbeatResponse{ return &kevo.ReplicaHeartbeatResponse{
Success: true, Success: true,
PrimaryLsn: primaryLSN, PrimaryLsn: primaryLSN,
@ -491,9 +260,6 @@ func (s *ReplicationServiceServer) GetWALEntries(
Count: uint32(len(entries)), Count: uint32(len(entries)),
} }
// Calculate batch checksum
pbBatch.Checksum = calculateBatchChecksum(pbBatch)
// Check if there are more entries // Check if there are more entries
hasMore := s.replicator.GetHighestTimestamp() > entries[len(entries)-1].SequenceNumber hasMore := s.replicator.GetHighestTimestamp() > entries[len(entries)-1].SequenceNumber
@ -571,8 +337,6 @@ func (s *ReplicationServiceServer) StreamWALEntries(
LastLsn: entries[len(entries)-1].SequenceNumber, LastLsn: entries[len(entries)-1].SequenceNumber,
Count: uint32(len(entries)), Count: uint32(len(entries)),
} }
// Calculate batch checksum for integrity validation
pbBatch.Checksum = calculateBatchChecksum(pbBatch)
// Send batch // Send batch
if err := stream.Send(pbBatch); err != nil { if err := stream.Send(pbBatch); err != nil {
@ -619,7 +383,118 @@ func (s *ReplicationServiceServer) ReportAppliedEntries(
}, nil }, nil
} }
// Legacy implementation moved to replication_service_bootstrap.go // RequestBootstrap handles bootstrap requests from replicas
func (s *ReplicationServiceServer) RequestBootstrap(
req *kevo.BootstrapRequest,
stream kevo.ReplicationService_RequestBootstrapServer,
) error {
// Validate request
if req.ReplicaId == "" {
return status.Error(codes.InvalidArgument, "replica_id is required")
}
// Check if replica is registered
s.replicasMutex.RLock()
replica, exists := s.replicas[req.ReplicaId]
s.replicasMutex.RUnlock()
if !exists {
return status.Error(codes.NotFound, "replica not registered")
}
// Update replica status
s.replicasMutex.Lock()
replica.Status = transport.StatusBootstrapping
s.replicasMutex.Unlock()
// Create snapshot of current data
snapshotLSN := s.replicator.GetHighestTimestamp()
iterator, err := s.storageSnapshot.CreateSnapshotIterator()
if err != nil {
s.replicasMutex.Lock()
replica.Status = transport.StatusError
replica.Error = err
s.replicasMutex.Unlock()
return status.Errorf(codes.Internal, "failed to create snapshot: %v", err)
}
defer iterator.Close()
// Stream key-value pairs in batches
batchSize := 100 // Can be configurable
totalCount := s.storageSnapshot.KeyCount()
sentCount := 0
batch := make([]*kevo.KeyValuePair, 0, batchSize)
for {
// Get next key-value pair
key, value, err := iterator.Next()
if err == io.EOF {
break
}
if err != nil {
s.replicasMutex.Lock()
replica.Status = transport.StatusError
replica.Error = err
s.replicasMutex.Unlock()
return status.Errorf(codes.Internal, "error reading snapshot: %v", err)
}
// Add to batch
batch = append(batch, &kevo.KeyValuePair{
Key: key,
Value: value,
})
// Send batch if full
if len(batch) >= batchSize {
progress := float32(sentCount) / float32(totalCount)
if err := stream.Send(&kevo.BootstrapBatch{
Pairs: batch,
Progress: progress,
IsLast: false,
SnapshotLsn: snapshotLSN,
}); err != nil {
return err
}
// Reset batch and update count
sentCount += len(batch)
batch = batch[:0]
}
}
// Send final batch
if len(batch) > 0 {
sentCount += len(batch)
progress := float32(sentCount) / float32(totalCount)
if err := stream.Send(&kevo.BootstrapBatch{
Pairs: batch,
Progress: progress,
IsLast: true,
SnapshotLsn: snapshotLSN,
}); err != nil {
return err
}
} else if sentCount > 0 {
// Send empty final batch to mark the end
if err := stream.Send(&kevo.BootstrapBatch{
Pairs: []*kevo.KeyValuePair{},
Progress: 1.0,
IsLast: true,
SnapshotLsn: snapshotLSN,
}); err != nil {
return err
}
}
// Update replica status
s.replicasMutex.Lock()
replica.Status = transport.StatusSyncing
replica.CurrentLSN = snapshotLSN
s.replicasMutex.Unlock()
return nil
}
// Helper to convert replica info to proto message // Helper to convert replica info to proto message
func convertReplicaInfoToProto(replica *transport.ReplicaInfo) *kevo.ReplicaInfo { func convertReplicaInfoToProto(replica *transport.ReplicaInfo) *kevo.ReplicaInfo {
@ -657,12 +532,12 @@ func convertReplicaInfoToProto(replica *transport.ReplicaInfo) *kevo.ReplicaInfo
// Create proto message // Create proto message
pbReplica := &kevo.ReplicaInfo{ pbReplica := &kevo.ReplicaInfo{
ReplicaId: replica.ID, ReplicaId: replica.ID,
Address: replica.Address, Address: replica.Address,
Role: pbRole, Role: pbRole,
Status: pbStatus, Status: pbStatus,
LastSeenMs: replica.LastSeen.UnixMilli(), LastSeenMs: replica.LastSeen.UnixMilli(),
CurrentLsn: replica.CurrentLSN, CurrentLsn: replica.CurrentLSN,
ReplicationLagMs: replica.ReplicationLag.Milliseconds(), ReplicationLagMs: replica.ReplicationLag.Milliseconds(),
} }
@ -676,60 +551,14 @@ func convertReplicaInfoToProto(replica *transport.ReplicaInfo) *kevo.ReplicaInfo
// Convert WAL entry to proto message // Convert WAL entry to proto message
func convertWALEntryToProto(entry *wal.Entry) *kevo.WALEntry { func convertWALEntryToProto(entry *wal.Entry) *kevo.WALEntry {
pbEntry := &kevo.WALEntry{ return &kevo.WALEntry{
SequenceNumber: entry.SequenceNumber, SequenceNumber: entry.SequenceNumber,
Type: uint32(entry.Type), Type: uint32(entry.Type),
Key: entry.Key, Key: entry.Key,
Value: entry.Value, Value: entry.Value,
// We'd normally calculate a checksum here
Checksum: nil,
} }
// Calculate checksum for data integrity
pbEntry.Checksum = calculateEntryChecksum(pbEntry)
return pbEntry
}
// calculateEntryChecksum calculates a CRC32 checksum for a WAL entry
func calculateEntryChecksum(entry *kevo.WALEntry) []byte {
// Create a checksum calculator
hasher := crc32.NewIEEE()
// Write all fields to the hasher
binary.Write(hasher, binary.LittleEndian, entry.SequenceNumber)
binary.Write(hasher, binary.LittleEndian, entry.Type)
hasher.Write(entry.Key)
if entry.Value != nil {
hasher.Write(entry.Value)
}
// Return the checksum as a byte slice
checksum := make([]byte, 4)
binary.LittleEndian.PutUint32(checksum, hasher.Sum32())
return checksum
}
// calculateBatchChecksum calculates a CRC32 checksum for a WAL entry batch
func calculateBatchChecksum(batch *kevo.WALEntryBatch) []byte {
// Create a checksum calculator
hasher := crc32.NewIEEE()
// Write batch metadata to the hasher
binary.Write(hasher, binary.LittleEndian, batch.FirstLsn)
binary.Write(hasher, binary.LittleEndian, batch.LastLsn)
binary.Write(hasher, binary.LittleEndian, batch.Count)
// Write the checksum of each entry to the hasher
for _, entry := range batch.Entries {
// We're using entry checksums as part of the batch checksum
// to avoid recalculating entry data
if entry.Checksum != nil {
hasher.Write(entry.Checksum)
}
}
// Return the checksum as a byte slice
checksum := make([]byte, 4)
binary.LittleEndian.PutUint32(checksum, hasher.Sum32())
return checksum
} }
// entryNotifier is a helper struct that implements replication.EntryProcessor // entryNotifier is a helper struct that implements replication.EntryProcessor
@ -779,134 +608,3 @@ type SnapshotIterator interface {
// Close closes the iterator // Close closes the iterator
Close() error Close() error
} }
// IsReplicaStale checks if a replica is considered stale based on the last heartbeat
func (s *ReplicationServiceServer) IsReplicaStale(replicaID string, threshold time.Duration) bool {
s.replicasMutex.RLock()
defer s.replicasMutex.RUnlock()
replica, exists := s.replicas[replicaID]
if !exists {
return true // Consider non-existent replicas as stale
}
// Check if the last seen time is older than the threshold
return time.Since(replica.LastSeen) > threshold
}
// DetectStaleReplicas finds all replicas that haven't sent a heartbeat within the threshold
func (s *ReplicationServiceServer) DetectStaleReplicas(threshold time.Duration) []string {
s.replicasMutex.RLock()
defer s.replicasMutex.RUnlock()
staleReplicas := make([]string, 0)
now := time.Now()
for id, replica := range s.replicas {
if now.Sub(replica.LastSeen) > threshold {
staleReplicas = append(staleReplicas, id)
}
}
return staleReplicas
}
// GetMetrics returns the current replication metrics
func (s *ReplicationServiceServer) GetMetrics() map[string]interface{} {
if s.metrics == nil {
return map[string]interface{}{
"error": "metrics collection is not enabled",
}
}
// Get summary metrics
summary := s.metrics.GetSummaryMetrics()
// Add replica-specific metrics
replicaMetrics := s.metrics.GetAllReplicaMetrics()
replicasData := make(map[string]interface{})
for id, metrics := range replicaMetrics {
replicaData := map[string]interface{}{
"status": string(metrics.Status),
"last_seen": metrics.LastSeen.Format(time.RFC3339),
"replication_lag_ms": metrics.ReplicationLag.Milliseconds(),
"applied_lsn": metrics.AppliedLSN,
"connected_duration": metrics.ConnectedDuration.String(),
"heartbeat_count": metrics.HeartbeatCount,
"wal_entries_sent": metrics.WALEntriesSent,
"bytes_sent": metrics.BytesSent,
"error_count": metrics.ErrorCount,
}
// Add bootstrap metrics if available
replicaData["bootstrap_count"] = metrics.BootstrapCount
if !metrics.LastBootstrapTime.IsZero() {
replicaData["last_bootstrap_time"] = metrics.LastBootstrapTime.Format(time.RFC3339)
replicaData["last_bootstrap_duration"] = metrics.LastBootstrapDuration.String()
}
replicasData[id] = replicaData
}
summary["replicas"] = replicasData
// Add bootstrap service status if available
if s.bootstrapService != nil {
summary["bootstrap"] = s.bootstrapService.getBootstrapStatus()
}
return summary
}
// GetReplicaMetrics returns metrics for a specific replica
func (s *ReplicationServiceServer) GetReplicaMetrics(replicaID string) (map[string]interface{}, error) {
if s.metrics == nil {
return nil, fmt.Errorf("metrics collection is not enabled")
}
metrics, found := s.metrics.GetReplicaMetrics(replicaID)
if !found {
return nil, fmt.Errorf("no metrics found for replica %s", replicaID)
}
result := map[string]interface{}{
"status": string(metrics.Status),
"last_seen": metrics.LastSeen.Format(time.RFC3339),
"replication_lag_ms": metrics.ReplicationLag.Milliseconds(),
"applied_lsn": metrics.AppliedLSN,
"connected_duration": metrics.ConnectedDuration.String(),
"heartbeat_count": metrics.HeartbeatCount,
"wal_entries_sent": metrics.WALEntriesSent,
"bytes_sent": metrics.BytesSent,
"error_count": metrics.ErrorCount,
"bootstrap_count": metrics.BootstrapCount,
}
// Add bootstrap time/duration if available
if !metrics.LastBootstrapTime.IsZero() {
result["last_bootstrap_time"] = metrics.LastBootstrapTime.Format(time.RFC3339)
result["last_bootstrap_duration"] = metrics.LastBootstrapDuration.String()
}
// Add bootstrap progress if available
if s.bootstrapService != nil {
bootstrapStatus := s.bootstrapService.getBootstrapStatus()
if bootstrapStatus != nil {
if bootstrapState, ok := bootstrapStatus["bootstrap_state"].(map[string]interface{}); ok {
if bootstrapState["replica_id"] == replicaID {
result["bootstrap_progress"] = bootstrapState["progress"]
result["bootstrap_status"] = map[string]interface{}{
"started_at": bootstrapState["started_at"],
"completed": bootstrapState["completed"],
"applied_keys": bootstrapState["applied_keys"],
"total_keys": bootstrapState["total_keys"],
"snapshot_lsn": bootstrapState["snapshot_lsn"],
}
}
}
}
}
return result, nil
}

302
pkg/grpc/service/replication_service_bootstrap.go
View File

@ -1,302 +0,0 @@
package service
import (
"fmt"
"io"
"time"
"github.com/KevoDB/kevo/pkg/replication"
"github.com/KevoDB/kevo/pkg/transport"
"github.com/KevoDB/kevo/proto/kevo"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
)
// InitBootstrapService initializes the bootstrap service component
func (s *ReplicationServiceServer) InitBootstrapService(options *BootstrapServiceOptions) error {
// Get the storage snapshot provider from the storage snapshot
var snapshotProvider replication.StorageSnapshotProvider
if s.storageSnapshot != nil {
// If we have a storage snapshot directly, create an adapter
snapshotProvider = &storageSnapshotAdapter{
snapshot: s.storageSnapshot,
}
}
// Create the bootstrap service
bootstrapSvc, err := newBootstrapService(
options,
snapshotProvider,
s.replicator,
s.applier,
)
if err != nil {
return fmt.Errorf("failed to initialize bootstrap service: %w", err)
}
s.bootstrapService = bootstrapSvc
return nil
}
// RequestBootstrap handles bootstrap requests from replicas
func (s *ReplicationServiceServer) RequestBootstrap(
req *kevo.BootstrapRequest,
stream kevo.ReplicationService_RequestBootstrapServer,
) error {
// Validate request
if req.ReplicaId == "" {
return status.Error(codes.InvalidArgument, "replica_id is required")
}
// Check if replica is registered
s.replicasMutex.RLock()
replica, exists := s.replicas[req.ReplicaId]
s.replicasMutex.RUnlock()
if !exists {
return status.Error(codes.NotFound, "replica not registered")
}
// Check access control if enabled
if s.accessControl.IsEnabled() {
md, ok := metadata.FromIncomingContext(stream.Context())
if !ok {
return status.Error(codes.Unauthenticated, "missing authentication metadata")
}
tokens := md.Get("x-replica-token")
token := ""
if len(tokens) > 0 {
token = tokens[0]
}
if err := s.accessControl.AuthenticateReplica(req.ReplicaId, token); err != nil {
return status.Error(codes.Unauthenticated, "authentication failed")
}
// Bootstrap requires at least read access
if err := s.accessControl.AuthorizeReplicaAction(req.ReplicaId, transport.AccessReadOnly); err != nil {
return status.Error(codes.PermissionDenied, "not authorized for bootstrap")
}
}
// Update replica status
s.replicasMutex.Lock()
replica.Status = transport.StatusBootstrapping
s.replicasMutex.Unlock()
// Update metrics
if s.metrics != nil {
s.metrics.UpdateReplicaStatus(req.ReplicaId, replica.Status, replica.CurrentLSN)
// We'll add bootstrap count metrics in the future
}
// Pass the request to the bootstrap service
if s.bootstrapService == nil {
// If bootstrap service isn't initialized, use the old implementation
return s.legacyRequestBootstrap(req, stream)
}
err := s.bootstrapService.handleBootstrapRequest(req, stream)
// Update replica status based on the result
s.replicasMutex.Lock()
if err != nil {
replica.Status = transport.StatusError
replica.Error = err
} else {
replica.Status = transport.StatusSyncing
// Get the snapshot LSN
snapshot := s.bootstrapService.getBootstrapStatus()
if activeBootstraps, ok := snapshot["active_bootstraps"].(map[string]map[string]interface{}); ok {
if replicaInfo, ok := activeBootstraps[req.ReplicaId]; ok {
if snapshotLSN, ok := replicaInfo["snapshot_lsn"].(uint64); ok {
replica.CurrentLSN = snapshotLSN
}
}
}
}
s.replicasMutex.Unlock()
// Update metrics
if s.metrics != nil {
s.metrics.UpdateReplicaStatus(req.ReplicaId, replica.Status, replica.CurrentLSN)
}
return err
}
// legacyRequestBootstrap is the original bootstrap implementation, kept for compatibility
func (s *ReplicationServiceServer) legacyRequestBootstrap(
req *kevo.BootstrapRequest,
stream kevo.ReplicationService_RequestBootstrapServer,
) error {
// Update replica status
s.replicasMutex.Lock()
replica, exists := s.replicas[req.ReplicaId]
if exists {
replica.Status = transport.StatusBootstrapping
}
s.replicasMutex.Unlock()
// Create snapshot of current data
snapshotLSN := s.replicator.GetHighestTimestamp()
iterator, err := s.storageSnapshot.CreateSnapshotIterator()
if err != nil {
s.replicasMutex.Lock()
if replica != nil {
replica.Status = transport.StatusError
replica.Error = err
}
s.replicasMutex.Unlock()
return status.Errorf(codes.Internal, "failed to create snapshot: %v", err)
}
defer iterator.Close()
// Stream key-value pairs in batches
batchSize := 100 // Can be configurable
totalCount := s.storageSnapshot.KeyCount()
sentCount := 0
batch := make([]*kevo.KeyValuePair, 0, batchSize)
for {
// Get next key-value pair
key, value, err := iterator.Next()
if err == io.EOF {
break
}
if err != nil {
s.replicasMutex.Lock()
if replica != nil {
replica.Status = transport.StatusError
replica.Error = err
}
s.replicasMutex.Unlock()
return status.Errorf(codes.Internal, "error reading snapshot: %v", err)
}
// Add to batch
batch = append(batch, &kevo.KeyValuePair{
Key: key,
Value: value,
})
// Send batch if full
if len(batch) >= batchSize {
progress := float32(sentCount) / float32(totalCount)
if err := stream.Send(&kevo.BootstrapBatch{
Pairs: batch,
Progress: progress,
IsLast: false,
SnapshotLsn: snapshotLSN,
}); err != nil {
return err
}
// Reset batch and update count
sentCount += len(batch)
batch = batch[:0]
}
}
// Send final batch
if len(batch) > 0 {
sentCount += len(batch)
progress := float32(sentCount) / float32(totalCount)
if err := stream.Send(&kevo.BootstrapBatch{
Pairs: batch,
Progress: progress,
IsLast: true,
SnapshotLsn: snapshotLSN,
}); err != nil {
return err
}
} else if sentCount > 0 {
// Send empty final batch to mark the end
if err := stream.Send(&kevo.BootstrapBatch{
Pairs: []*kevo.KeyValuePair{},
Progress: 1.0,
IsLast: true,
SnapshotLsn: snapshotLSN,
}); err != nil {
return err
}
}
// Update replica status
s.replicasMutex.Lock()
if replica != nil {
replica.Status = transport.StatusSyncing
replica.CurrentLSN = snapshotLSN
}
s.replicasMutex.Unlock()
// Update metrics
if s.metrics != nil {
s.metrics.UpdateReplicaStatus(req.ReplicaId, transport.StatusSyncing, snapshotLSN)
}
return nil
}
// GetBootstrapStatusMap retrieves the current status of bootstrap operations as a map
func (s *ReplicationServiceServer) GetBootstrapStatusMap() map[string]string {
// If bootstrap service isn't initialized, return empty status
if s.bootstrapService == nil {
return map[string]string{
"message": "bootstrap service not initialized",
}
}
// Get bootstrap status from the service
status := s.bootstrapService.getBootstrapStatus()
// Convert to proto-friendly format
protoStatus := make(map[string]string)
convertStatusToString(status, protoStatus, "")
return protoStatus
}
// Helper function to convert nested status map to flat string map for proto
func convertStatusToString(input map[string]interface{}, output map[string]string, prefix string) {
for k, v := range input {
key := k
if prefix != "" {
key = prefix + "." + k
}
switch val := v.(type) {
case string:
output[key] = val
case int, int64, uint64, float64, bool:
output[key] = fmt.Sprintf("%v", val)
case map[string]interface{}:
convertStatusToString(val, output, key)
case []interface{}:
for i, item := range val {
itemKey := fmt.Sprintf("%s[%d]", key, i)
if m, ok := item.(map[string]interface{}); ok {
convertStatusToString(m, output, itemKey)
} else {
output[itemKey] = fmt.Sprintf("%v", item)
}
}
case time.Time:
output[key] = val.Format(time.RFC3339)
default:
output[key] = fmt.Sprintf("%v", val)
}
}
}
// storageSnapshotAdapter adapts StorageSnapshot to StorageSnapshotProvider
type storageSnapshotAdapter struct {
snapshot replication.StorageSnapshot
}
func (a *storageSnapshotAdapter) CreateSnapshot() (replication.StorageSnapshot, error) {
return a.snapshot, nil
}

28
pkg/grpc/service/test_helpers.go
View File

@ -1,28 +0,0 @@
package service
import (
"github.com/KevoDB/kevo/pkg/replication"
"github.com/KevoDB/kevo/pkg/wal"
)
// For testing purposes, we need our mocks to be convertible to WALReplicator
// The issue is that the WALReplicator has unexported fields, so we can't just embed it
// Let's create a clean test implementation of the replication.WALReplicator interface
// CreateTestReplicator creates a replication.WALReplicator for tests
func CreateTestReplicator(highTS uint64) *replication.WALReplicator {
return &replication.WALReplicator{}
}
// Cast mock storage snapshot
func castToStorageSnapshot(s interface {
CreateSnapshotIterator() (replication.SnapshotIterator, error)
KeyCount() int64
}) replication.StorageSnapshot {
return s.(replication.StorageSnapshot)
}
// MockGetEntriesAfter implements mocking for WAL replicator GetEntriesAfter
func MockGetEntriesAfter(position replication.ReplicationPosition) ([]*wal.Entry, error) {
return nil, nil
}

152
pkg/grpc/transport/reconnect.go
View File

@ -1,152 +0,0 @@
package transport
import (
"context"
"math"
"time"
"github.com/KevoDB/kevo/pkg/transport"
)
// reconnectLoop continuously attempts to reconnect the client
func (c *ReplicationGRPCClient) reconnectLoop(initialDelay time.Duration) {
// If we're shutting down, don't attempt to reconnect
if c.shuttingDown {
return
}
// Start with initial delay
delay := initialDelay
// Reset reconnect attempt counter on first try
c.reconnectAttempt = 0
for {
// Check if we're shutting down
if c.shuttingDown {
return
}
// Wait for the delay
time.Sleep(delay)
// Attempt to reconnect
c.reconnectAttempt++
maxAttempts := c.options.RetryPolicy.MaxRetries
c.logger.Info("Attempting to reconnect (%d/%d)", c.reconnectAttempt, maxAttempts)
// Create context with timeout
ctx, cancel := context.WithTimeout(context.Background(), c.options.Timeout)
// Attempt connection
err := c.Connect(ctx)
cancel()
if err == nil {
// Connection successful
c.logger.Info("Successfully reconnected after %d attempts", c.reconnectAttempt)
// Reset circuit breaker
c.circuitBreaker.Reset()
// Register with primary if we have a replica ID
if c.replicaID != "" {
ctx, cancel := context.WithTimeout(context.Background(), c.options.Timeout)
defer cancel()
err := c.RegisterAsReplica(ctx, c.replicaID)
if err != nil {
c.logger.Error("Failed to re-register as replica: %v", err)
} else {
c.logger.Info("Successfully re-registered as replica %s", c.replicaID)
}
}
return
}
// Log the reconnection failure
c.logger.Error("Failed to reconnect (attempt %d/%d): %v",
c.reconnectAttempt, maxAttempts, err)
// Check if we've exceeded the maximum number of reconnection attempts
if maxAttempts > 0 && c.reconnectAttempt >= maxAttempts {
c.logger.Error("Maximum reconnection attempts (%d) exceeded", maxAttempts)
// Trip the circuit breaker to prevent further attempts for a while
c.circuitBreaker.Trip()
return
}
// Increase delay for next attempt (with jitter)
delay = calculateBackoff(c.reconnectAttempt, c.options.RetryPolicy)
}
}
// calculateBackoff calculates the backoff duration for the next reconnection attempt
func calculateBackoff(attempt int, policy transport.RetryPolicy) time.Duration {
// Calculate base backoff using exponential formula
backoff := float64(policy.InitialBackoff) *
math.Pow(2, float64(attempt-1)) // 2^(attempt-1)
// Apply backoff factor if specified
if policy.BackoffFactor > 0 {
backoff *= policy.BackoffFactor
}
// Apply jitter if specified
if policy.Jitter > 0 {
jitter := 1.0 - policy.Jitter/2 + policy.Jitter*float64(time.Now().UnixNano()%1000)/1000.0
backoff *= jitter
}
// Cap at max backoff
if policy.MaxBackoff > 0 && time.Duration(backoff) > policy.MaxBackoff {
return policy.MaxBackoff
}
return time.Duration(backoff)
}
// maybeReconnect checks if the connection is alive, and starts a reconnection
// loop if it's not
func (c *ReplicationGRPCClient) maybeReconnect() {
// Check if we're connected
if c.IsConnected() {
return
}
// Check if the circuit breaker is open
if c.circuitBreaker.IsOpen() {
c.logger.Warn("Circuit breaker is open, not attempting to reconnect")
return
}
// Start reconnection loop in a new goroutine
go c.reconnectLoop(c.options.RetryPolicy.InitialBackoff)
}
// handleConnectionError processes a connection error and triggers reconnection if needed
func (c *ReplicationGRPCClient) handleConnectionError(err error) error {
if err == nil {
return nil
}
// Update status
c.mu.Lock()
c.status.LastError = err
wasConnected := c.status.Connected
c.status.Connected = false
c.mu.Unlock()
// Log the error
c.logger.Error("Connection error: %v", err)
// Check if we should attempt to reconnect
if wasConnected && !c.shuttingDown {
c.logger.Info("Connection lost, attempting to reconnect")
go c.reconnectLoop(c.options.RetryPolicy.InitialBackoff)
}
return err
}

255
pkg/grpc/transport/reconnect_test.go
View File

@ -1,255 +0,0 @@
package transport
import (
"errors"
"sync/atomic"
"testing"
"time"
"github.com/KevoDB/kevo/pkg/common/log"
"github.com/KevoDB/kevo/pkg/transport"
)
func TestCalculateBackoff(t *testing.T) {
policy := transport.RetryPolicy{
InitialBackoff: 100 * time.Millisecond,
MaxBackoff: 5 * time.Second,
BackoffFactor: 2.0,
Jitter: 0.0, // Disable jitter for deterministic tests
}
tests := []struct {
name string
attempt int
expectedRange [2]time.Duration // Min and max expected duration
}{
{
name: "First attempt",
attempt: 1,
expectedRange: [2]time.Duration{100 * time.Millisecond, 200 * time.Millisecond},
},
{
name: "Second attempt",
attempt: 2,
expectedRange: [2]time.Duration{200 * time.Millisecond, 400 * time.Millisecond},
},
{
name: "Third attempt",
attempt: 3,
expectedRange: [2]time.Duration{400 * time.Millisecond, 800 * time.Millisecond},
},
{
name: "Tenth attempt",
attempt: 10,
expectedRange: [2]time.Duration{5 * time.Second, 5 * time.Second}, // Capped at max
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
backoff := calculateBackoff(tt.attempt, policy)
if backoff < tt.expectedRange[0] || backoff > tt.expectedRange[1] {
t.Errorf("Expected backoff between %v and %v, got %v",
tt.expectedRange[0], tt.expectedRange[1], backoff)
}
})
}
// Test with jitter
t.Run("With jitter", func(t *testing.T) {
jitterPolicy := transport.RetryPolicy{
InitialBackoff: 100 * time.Millisecond,
MaxBackoff: 5 * time.Second,
BackoffFactor: 2.0,
Jitter: 0.5, // 50% jitter
}
// Run multiple times to check for variation
var values []time.Duration
for i := 0; i < 10; i++ {
values = append(values, calculateBackoff(2, jitterPolicy))
}
// Check if we have at least some variation (jitter is working)
allSame := true
for i := 1; i < len(values); i++ {
if values[i] != values[0] {
allSame = false
break
}
}
if allSame {
t.Error("Expected variation with jitter enabled, but all values are the same")
}
})
}
// mockClient is a standalone struct for testing that doesn't rely on the reconnectLoop method
type mockClient struct {
logger log.Logger
circuitBreaker *transport.CircuitBreaker
status transport.TransportStatus
options transport.TransportOptions
shuttingDown bool
reconnectCalled atomic.Bool
}
// handleConnectionError is a copy of the real implementation but uses reconnectCalled instead
func (c *mockClient) handleConnectionError(err error) error {
if err == nil {
return nil
}
// Update status
c.status.LastError = err
wasConnected := c.status.Connected
c.status.Connected = false
// Log the error
c.logger.Error("Connection error: %v", err)
// Check if we should attempt to reconnect
if wasConnected && !c.shuttingDown {
c.logger.Info("Connection lost, attempting to reconnect")
// Instead of calling reconnectLoop, set the flag
c.reconnectCalled.Store(true)
}
return err
}
// maybeReconnect is a copy of the real implementation but uses reconnectCalled instead
func (c *mockClient) maybeReconnect() {
// Check if we're connected
if c.status.Connected {
return
}
// Check if the circuit breaker is open
if c.circuitBreaker.IsOpen() {
c.logger.Warn("Circuit breaker is open, not attempting to reconnect")
return
}
// Mark that reconnect was called
c.reconnectCalled.Store(true)
}
// IsConnected returns whether the client is connected
func (c *mockClient) IsConnected() bool {
return c.status.Connected
}
func TestHandleConnectionError(t *testing.T) {
// Create a mock client
client := &mockClient{
logger: log.NewStandardLogger(),
circuitBreaker: transport.NewCircuitBreaker(3, 100*time.Millisecond),
status: transport.TransportStatus{
Connected: true,
},
options: transport.TransportOptions{
RetryPolicy: transport.RetryPolicy{
InitialBackoff: 1 * time.Millisecond,
MaxBackoff: 10 * time.Millisecond,
MaxRetries: 2,
},
},
}
// Test with a connection error
testErr := errors.New("test connection error")
result := client.handleConnectionError(testErr)
// Check results
if result != testErr {
t.Errorf("Expected error to be returned, got: %v", result)
}
if client.status.Connected {
t.Error("Expected connected status to be false")
}
if client.status.LastError != testErr {
t.Errorf("Expected LastError to be set, got: %v", client.status.LastError)
}
// Check if reconnect was attempted
if !client.reconnectCalled.Load() {
t.Error("Expected reconnect to be attempted")
}
// Test with nil error
client.reconnectCalled.Store(false)
result = client.handleConnectionError(nil)
if result != nil {
t.Errorf("Expected nil error to be returned, got: %v", result)
}
if client.reconnectCalled.Load() {
t.Error("Expected no reconnect attempt for nil error")
}
}
func TestMaybeReconnect(t *testing.T) {
// Test case 1: Already connected
t.Run("Already connected", func(t *testing.T) {
client := &mockClient{
logger: log.NewStandardLogger(),
circuitBreaker: transport.NewCircuitBreaker(3, 100*time.Millisecond),
status: transport.TransportStatus{
Connected: true,
},
}
client.maybeReconnect()
if client.reconnectCalled.Load() {
t.Error("Expected no reconnect attempt when already connected")
}
})
// Test case 2: Not connected but circuit breaker open
t.Run("Circuit breaker open", func(t *testing.T) {
client := &mockClient{
logger: log.NewStandardLogger(),
circuitBreaker: transport.NewCircuitBreaker(3, 100*time.Millisecond),
status: transport.TransportStatus{
Connected: false,
},
}
// Trip the circuit breaker
client.circuitBreaker.Trip()
client.maybeReconnect()
if client.reconnectCalled.Load() {
t.Error("Expected no reconnect attempt when circuit breaker is open")
}
})
// Test case 3: Not connected and circuit breaker closed
t.Run("Not connected, circuit closed", func(t *testing.T) {
client := &mockClient{
logger: log.NewStandardLogger(),
circuitBreaker: transport.NewCircuitBreaker(3, 100*time.Millisecond),
status: transport.TransportStatus{
Connected: false,
},
options: transport.TransportOptions{
RetryPolicy: transport.RetryPolicy{
InitialBackoff: 1 * time.Millisecond,
},
},
}
client.maybeReconnect()
if !client.reconnectCalled.Load() {
t.Error("Expected reconnect attempt when not connected and circuit breaker closed")
}
})
}

900
pkg/grpc/transport/replication_client.go
View File

File diff suppressed because it is too large Load Diff

49
pkg/grpc/transport/replication_server.go
View File

@ -12,43 +12,35 @@ import (
// ReplicationGRPCServer implements the ReplicationServer interface using gRPC // ReplicationGRPCServer implements the ReplicationServer interface using gRPC
type ReplicationGRPCServer struct { type ReplicationGRPCServer struct {
transportManager *GRPCTransportManager transportManager *GRPCTransportManager
replicationService *service.ReplicationServiceServer replicationService *service.ReplicationServiceServer
options transport.TransportOptions options transport.TransportOptions
replicas map[string]*transport.ReplicaInfo replicas map[string]*transport.ReplicaInfo
mu sync.RWMutex mu sync.RWMutex
} }
// NewReplicationGRPCServer creates a new ReplicationGRPCServer // NewReplicationGRPCServer creates a new ReplicationGRPCServer
func NewReplicationGRPCServer( func NewReplicationGRPCServer(
transportManager *GRPCTransportManager, transportManager *GRPCTransportManager,
replicator replication.EntryReplicator, replicator *replication.WALReplicator,
applier replication.EntryApplier, applier *replication.WALApplier,
serializer *replication.EntrySerializer, serializer *replication.EntrySerializer,
storageSnapshot replication.StorageSnapshot, storageSnapshot replication.StorageSnapshot,
options transport.TransportOptions, options transport.TransportOptions,
) (*ReplicationGRPCServer, error) { ) (*ReplicationGRPCServer, error) {
// Create replication service options with default settings
serviceOptions := service.DefaultReplicationServiceOptions()
// Create replication service // Create replication service
replicationService, err := service.NewReplicationService( replicationService := service.NewReplicationService(
replicator, replicator,
applier, applier,
serializer, serializer,
storageSnapshot, storageSnapshot,
serviceOptions,
) )
if err != nil {
return nil, fmt.Errorf("failed to create replication service: %w", err)
}
return &ReplicationGRPCServer{ return &ReplicationGRPCServer{
transportManager: transportManager, transportManager: transportManager,
replicationService: replicationService, replicationService: replicationService,
options: options, options: options,
replicas: make(map[string]*transport.ReplicaInfo), replicas: make(map[string]*transport.ReplicaInfo),
}, nil }, nil
} }
@ -193,29 +185,16 @@ func init() {
// WithReplicator adds a replicator to the replication server // WithReplicator adds a replicator to the replication server
func (s *ReplicationGRPCServer) WithReplicator( func (s *ReplicationGRPCServer) WithReplicator(
replicator replication.EntryReplicator, replicator *replication.WALReplicator,
applier replication.EntryApplier, applier *replication.WALApplier,
serializer *replication.EntrySerializer, serializer *replication.EntrySerializer,
storageSnapshot replication.StorageSnapshot, storageSnapshot replication.StorageSnapshot,
) *ReplicationGRPCServer { ) *ReplicationGRPCServer {
// Create replication service options with default settings s.replicationService = service.NewReplicationService(
serviceOptions := service.DefaultReplicationServiceOptions()
// Create replication service
replicationService, err := service.NewReplicationService(
replicator, replicator,
applier, applier,
serializer, serializer,
storageSnapshot, storageSnapshot,
serviceOptions,
) )
if err != nil {
// Log error but continue with nil service
fmt.Printf("Error creating replication service: %v\n", err)
return s
}
s.replicationService = replicationService
return s return s
} }

40
pkg/replication/applier_test.go
View File

@ -11,15 +11,15 @@ import (
// MockStorage implements a simple mock storage for testing // MockStorage implements a simple mock storage for testing
type MockStorage struct { type MockStorage struct {
mu sync.Mutex mu sync.Mutex
data map[string][]byte data map[string][]byte
putFail bool putFail bool
deleteFail bool deleteFail bool
putCount int putCount int
deleteCount int deleteCount int
lastPutKey []byte lastPutKey []byte
lastPutValue []byte lastPutValue []byte
lastDeleteKey []byte lastDeleteKey []byte
} }
func NewMockStorage() *MockStorage { func NewMockStorage() *MockStorage {
@ -69,19 +69,17 @@ func (m *MockStorage) Delete(key []byte) error {
} }
// Stub implementations for the rest of the interface // Stub implementations for the rest of the interface
func (m *MockStorage) Close() error { return nil } func (m *MockStorage) Close() error { return nil }
func (m *MockStorage) IsDeleted(key []byte) (bool, error) { return false, nil } func (m *MockStorage) IsDeleted(key []byte) (bool, error) { return false, nil }
func (m *MockStorage) GetIterator() (iterator.Iterator, error) { return nil, nil } func (m *MockStorage) GetIterator() (iterator.Iterator, error) { return nil, nil }
func (m *MockStorage) GetRangeIterator(startKey, endKey []byte) (iterator.Iterator, error) { func (m *MockStorage) GetRangeIterator(startKey, endKey []byte) (iterator.Iterator, error) { return nil, nil }
return nil, nil func (m *MockStorage) ApplyBatch(entries []*wal.Entry) error { return nil }
} func (m *MockStorage) FlushMemTables() error { return nil }
func (m *MockStorage) ApplyBatch(entries []*wal.Entry) error { return nil } func (m *MockStorage) GetMemTableSize() uint64 { return 0 }
func (m *MockStorage) FlushMemTables() error { return nil } func (m *MockStorage) IsFlushNeeded() bool { return false }
func (m *MockStorage) GetMemTableSize() uint64 { return 0 } func (m *MockStorage) GetSSTables() []string { return nil }
func (m *MockStorage) IsFlushNeeded() bool { return false } func (m *MockStorage) ReloadSSTables() error { return nil }
func (m *MockStorage) GetSSTables() []string { return nil } func (m *MockStorage) RotateWAL() error { return nil }
func (m *MockStorage) ReloadSSTables() error { return nil }
func (m *MockStorage) RotateWAL() error { return nil }
func (m *MockStorage) GetStorageStats() map[string]interface{} { return nil } func (m *MockStorage) GetStorageStats() map[string]interface{} { return nil }
func TestWALApplierBasic(t *testing.T) { func TestWALApplierBasic(t *testing.T) {

421
pkg/replication/bootstrap.go
View File

@ -1,421 +0,0 @@
package replication
import (
"encoding/json"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"sync"
"time"
"github.com/KevoDB/kevo/pkg/common/log"
"github.com/KevoDB/kevo/pkg/transport"
)
var (
// ErrBootstrapInterrupted indicates the bootstrap process was interrupted
ErrBootstrapInterrupted = errors.New("bootstrap process was interrupted")
// ErrBootstrapFailed indicates the bootstrap process failed
ErrBootstrapFailed = errors.New("bootstrap process failed")
)
// BootstrapManager handles the bootstrap process for replicas
type BootstrapManager struct {
// Storage-related components
storageApplier StorageApplier
walApplier EntryApplier
// State tracking
bootstrapState *BootstrapState
bootstrapStatePath string
snapshotLSN uint64
// Mutex for synchronization
mu sync.RWMutex
// Logger instance
logger log.Logger
}
// StorageApplier defines an interface for applying key-value pairs to storage
type StorageApplier interface {
// Apply applies a key-value pair to storage
Apply(key, value []byte) error
// ApplyBatch applies multiple key-value pairs to storage
ApplyBatch(pairs []KeyValuePair) error
// Flush ensures all applied changes are persisted
Flush() error
}
// BootstrapState tracks the state of an ongoing bootstrap operation
type BootstrapState struct {
ReplicaID string `json:"replica_id"`
StartedAt time.Time `json:"started_at"`
LastUpdatedAt time.Time `json:"last_updated_at"`
SnapshotLSN uint64 `json:"snapshot_lsn"`
AppliedKeys int `json:"applied_keys"`
TotalKeys int `json:"total_keys"`
Progress float64 `json:"progress"`
Completed bool `json:"completed"`
Error string `json:"error,omitempty"`
CurrentChecksum uint32 `json:"current_checksum"`
}
// NewBootstrapManager creates a new bootstrap manager
func NewBootstrapManager(
storageApplier StorageApplier,
walApplier EntryApplier,
dataDir string,
logger log.Logger,
) (*BootstrapManager, error) {
if logger == nil {
logger = log.GetDefaultLogger().WithField("component", "bootstrap_manager")
}
// Create bootstrap directory if it doesn't exist
bootstrapDir := filepath.Join(dataDir, "bootstrap")
if err := os.MkdirAll(bootstrapDir, 0755); err != nil {
return nil, fmt.Errorf("failed to create bootstrap directory: %w", err)
}
bootstrapStatePath := filepath.Join(bootstrapDir, "bootstrap_state.json")
manager := &BootstrapManager{
storageApplier: storageApplier,
walApplier: walApplier,
bootstrapStatePath: bootstrapStatePath,
logger: logger,
}
// Try to load existing bootstrap state
state, err := manager.loadBootstrapState()
if err == nil && state != nil {
manager.bootstrapState = state
logger.Info("Loaded existing bootstrap state (progress: %.2f%%)", state.Progress*100)
}
return manager, nil
}
// loadBootstrapState loads the bootstrap state from disk
func (m *BootstrapManager) loadBootstrapState() (*BootstrapState, error) {
// Check if the state file exists
if _, err := os.Stat(m.bootstrapStatePath); os.IsNotExist(err) {
return nil, nil
}
// Read and parse the state file
file, err := os.Open(m.bootstrapStatePath)
if err != nil {
return nil, err
}
defer file.Close()
var state BootstrapState
if err := readJSONFile(file, &state); err != nil {
return nil, err
}
return &state, nil
}
// saveBootstrapState saves the bootstrap state to disk
func (m *BootstrapManager) saveBootstrapState() error {
m.mu.RLock()
state := m.bootstrapState
m.mu.RUnlock()
if state == nil {
return nil
}
// Update the last updated timestamp
state.LastUpdatedAt = time.Now()
// Create a temporary file
tempFile, err := os.CreateTemp(filepath.Dir(m.bootstrapStatePath), "bootstrap_state_*.json")
if err != nil {
return err
}
tempFilePath := tempFile.Name()
// Write state to the temporary file
if err := writeJSONFile(tempFile, state); err != nil {
tempFile.Close()
os.Remove(tempFilePath)
return err
}
// Close the temporary file
tempFile.Close()
// Atomically replace the state file
return os.Rename(tempFilePath, m.bootstrapStatePath)
}
// StartBootstrap begins the bootstrap process
func (m *BootstrapManager) StartBootstrap(
replicaID string,
bootstrapIterator transport.BootstrapIterator,
batchSize int,
) error {
m.mu.Lock()
// Initialize bootstrap state
m.bootstrapState = &BootstrapState{
ReplicaID: replicaID,
StartedAt: time.Now(),
LastUpdatedAt: time.Now(),
SnapshotLSN: 0,
AppliedKeys: 0,
TotalKeys: 0, // Will be updated during the process
Progress: 0.0,
Completed: false,
CurrentChecksum: 0,
}
m.mu.Unlock()
// Save initial state
if err := m.saveBootstrapState(); err != nil {
m.logger.Warn("Failed to save initial bootstrap state: %v", err)
}
// Start bootstrap process in a goroutine
go func() {
err := m.runBootstrap(bootstrapIterator, batchSize)
if err != nil && err != io.EOF {
m.mu.Lock()
m.bootstrapState.Error = err.Error()
m.mu.Unlock()
m.logger.Error("Bootstrap failed: %v", err)
if err := m.saveBootstrapState(); err != nil {
m.logger.Error("Failed to save failed bootstrap state: %v", err)
}
}
}()
return nil
}
// runBootstrap executes the bootstrap process
func (m *BootstrapManager) runBootstrap(
bootstrapIterator transport.BootstrapIterator,
batchSize int,
) error {
if batchSize <= 0 {
batchSize = 1000 // Default batch size
}
m.logger.Info("Starting bootstrap process")
// If we have an existing state, check if we need to resume
m.mu.RLock()
state := m.bootstrapState
appliedKeys := state.AppliedKeys
m.mu.RUnlock()
// Track batch for efficient application
batch := make([]KeyValuePair, 0, batchSize)
appliedInBatch := 0
lastSaveTime := time.Now()
saveThreshold := 5 * time.Second // Save state every 5 seconds
// Process all key-value pairs from the iterator
for {
// Check progress periodically
progress := bootstrapIterator.Progress()
// Update progress in state
m.mu.Lock()
m.bootstrapState.Progress = progress
m.mu.Unlock()
// Save state periodically
if time.Since(lastSaveTime) > saveThreshold {
if err := m.saveBootstrapState(); err != nil {
m.logger.Warn("Failed to save bootstrap state: %v", err)
}
lastSaveTime = time.Now()
// Log progress
m.logger.Info("Bootstrap progress: %.2f%% (%d keys applied)",
progress*100, appliedKeys)
}
// Get next key-value pair
key, value, err := bootstrapIterator.Next()
if err == io.EOF {
break
}
if err != nil {
return fmt.Errorf("error getting next key-value pair: %w", err)
}
// Skip keys if we're resuming and haven't reached the last applied key
if appliedInBatch < appliedKeys {
appliedInBatch++
continue
}
// Add to batch
batch = append(batch, KeyValuePair{
Key: key,
Value: value,
})
// Apply batch if full
if len(batch) >= batchSize {
if err := m.storageApplier.ApplyBatch(batch); err != nil {
return fmt.Errorf("error applying batch: %w", err)
}
// Update applied count
appliedInBatch += len(batch)
m.mu.Lock()
m.bootstrapState.AppliedKeys = appliedInBatch
m.mu.Unlock()
// Clear batch
batch = batch[:0]
}
}
// Apply any remaining items in the batch
if len(batch) > 0 {
if err := m.storageApplier.ApplyBatch(batch); err != nil {
return fmt.Errorf("error applying final batch: %w", err)
}
appliedInBatch += len(batch)
m.mu.Lock()
m.bootstrapState.AppliedKeys = appliedInBatch
m.mu.Unlock()
}
// Flush changes to storage
if err := m.storageApplier.Flush(); err != nil {
return fmt.Errorf("error flushing storage: %w", err)
}
// Update WAL applier with snapshot LSN
m.mu.RLock()
snapshotLSN := m.snapshotLSN
m.mu.RUnlock()
// Reset the WAL applier to start from the snapshot LSN
if m.walApplier != nil {
m.walApplier.ResetHighestApplied(snapshotLSN)
m.logger.Info("Reset WAL applier to snapshot LSN: %d", snapshotLSN)
}
// Update and save final state
m.mu.Lock()
m.bootstrapState.Completed = true
m.bootstrapState.Progress = 1.0
m.bootstrapState.TotalKeys = appliedInBatch
m.bootstrapState.SnapshotLSN = snapshotLSN
m.mu.Unlock()
if err := m.saveBootstrapState(); err != nil {
m.logger.Warn("Failed to save final bootstrap state: %v", err)
}
m.logger.Info("Bootstrap completed successfully: %d keys applied, snapshot LSN: %d",
appliedInBatch, snapshotLSN)
return nil
}
// IsBootstrapInProgress checks if a bootstrap operation is in progress
func (m *BootstrapManager) IsBootstrapInProgress() bool {
m.mu.RLock()
defer m.mu.RUnlock()
return m.bootstrapState != nil && !m.bootstrapState.Completed && m.bootstrapState.Error == ""
}
// GetBootstrapState returns the current bootstrap state
func (m *BootstrapManager) GetBootstrapState() *BootstrapState {
m.mu.RLock()
defer m.mu.RUnlock()
if m.bootstrapState == nil {
return nil
}
// Return a copy to avoid concurrent modification
stateCopy := *m.bootstrapState
return &stateCopy
}
// SetSnapshotLSN sets the LSN of the snapshot being bootstrapped
func (m *BootstrapManager) SetSnapshotLSN(lsn uint64) {
m.mu.Lock()
defer m.mu.Unlock()
m.snapshotLSN = lsn
if m.bootstrapState != nil {
m.bootstrapState.SnapshotLSN = lsn
}
}
// ClearBootstrapState clears any existing bootstrap state
func (m *BootstrapManager) ClearBootstrapState() error {
m.mu.Lock()
m.bootstrapState = nil
m.mu.Unlock()
// Remove state file if it exists
if _, err := os.Stat(m.bootstrapStatePath); err == nil {
if err := os.Remove(m.bootstrapStatePath); err != nil {
return fmt.Errorf("error removing bootstrap state file: %w", err)
}
}
return nil
}
// TransitionToWALReplication transitions from bootstrap to WAL replication
func (m *BootstrapManager) TransitionToWALReplication() error {
m.mu.RLock()
state := m.bootstrapState
m.mu.RUnlock()
if state == nil || !state.Completed {
return ErrBootstrapInterrupted
}
// Ensure WAL applier is properly initialized with the snapshot LSN
if m.walApplier != nil {
m.walApplier.ResetHighestApplied(state.SnapshotLSN)
m.logger.Info("Transitioned to WAL replication from LSN: %d", state.SnapshotLSN)
}
return nil
}
// JSON file handling functions
var writeJSONFile = writeJSONFileImpl
var readJSONFile = readJSONFileImpl
// writeJSONFileImpl writes a JSON object to a file
func writeJSONFileImpl(file *os.File, v interface{}) error {
encoder := json.NewEncoder(file)
return encoder.Encode(v)
}
// readJSONFileImpl reads a JSON object from a file
func readJSONFileImpl(file *os.File, v interface{}) error {
decoder := json.NewDecoder(file)
return decoder.Decode(v)
}

297
pkg/replication/bootstrap_generator.go
View File

@ -1,297 +0,0 @@
package replication
import (
"context"
"errors"
"fmt"
"io"
"sync"
"sync/atomic"
"time"
"github.com/KevoDB/kevo/pkg/common/log"
)
var (
// ErrBootstrapGenerationCancelled indicates the bootstrap generation was cancelled
ErrBootstrapGenerationCancelled = errors.New("bootstrap generation was cancelled")
// ErrBootstrapGenerationFailed indicates the bootstrap generation failed
ErrBootstrapGenerationFailed = errors.New("bootstrap generation failed")
)
// BootstrapGenerator manages the creation of storage snapshots for bootstrapping replicas
type BootstrapGenerator struct {
// Storage snapshot provider
snapshotProvider StorageSnapshotProvider
// Replicator for getting current LSN
replicator EntryReplicator
// Active bootstrap operations
activeBootstraps map[string]*bootstrapOperation
activeBootstrapsMutex sync.RWMutex
// Logger
logger log.Logger
}
// bootstrapOperation tracks a specific bootstrap operation
type bootstrapOperation struct {
replicaID string
startTime time.Time
keyCount int64
processedCount int64
snapshotLSN uint64
cancelled bool
completed bool
cancelFunc context.CancelFunc
}
// NewBootstrapGenerator creates a new bootstrap generator
func NewBootstrapGenerator(
snapshotProvider StorageSnapshotProvider,
replicator EntryReplicator,
logger log.Logger,
) *BootstrapGenerator {
if logger == nil {
logger = log.GetDefaultLogger().WithField("component", "bootstrap_generator")
}
return &BootstrapGenerator{
snapshotProvider: snapshotProvider,
replicator: replicator,
activeBootstraps: make(map[string]*bootstrapOperation),
logger: logger,
}
}
// StartBootstrapGeneration begins generating a bootstrap snapshot for a replica
func (g *BootstrapGenerator) StartBootstrapGeneration(
ctx context.Context,
replicaID string,
) (SnapshotIterator, uint64, error) {
// Create a cancellable context
bootstrapCtx, cancelFunc := context.WithCancel(ctx)
// Get current LSN from replicator
snapshotLSN := uint64(0)
if g.replicator != nil {
snapshotLSN = g.replicator.GetHighestTimestamp()
}
// Create snapshot
snapshot, err := g.snapshotProvider.CreateSnapshot()
if err != nil {
cancelFunc()
return nil, 0, fmt.Errorf("failed to create storage snapshot: %w", err)
}
// Get key count estimate
keyCount := snapshot.KeyCount()
// Create bootstrap operation tracking
operation := &bootstrapOperation{
replicaID: replicaID,
startTime: time.Now(),
keyCount: keyCount,
processedCount: 0,
snapshotLSN: snapshotLSN,
cancelled: false,
completed: false,
cancelFunc: cancelFunc,
}
// Register the bootstrap operation
g.activeBootstrapsMutex.Lock()
g.activeBootstraps[replicaID] = operation
g.activeBootstrapsMutex.Unlock()
// Create snapshot iterator
iterator, err := snapshot.CreateSnapshotIterator()
if err != nil {
cancelFunc()
g.activeBootstrapsMutex.Lock()
delete(g.activeBootstraps, replicaID)
g.activeBootstrapsMutex.Unlock()
return nil, 0, fmt.Errorf("failed to create snapshot iterator: %w", err)
}
g.logger.Info("Started bootstrap generation for replica %s (estimated keys: %d, snapshot LSN: %d)",
replicaID, keyCount, snapshotLSN)
// Create a tracking iterator that updates progress
trackingIterator := &trackingSnapshotIterator{
iterator: iterator,
ctx: bootstrapCtx,
operation: operation,
processedKey: func(count int64) {
atomic.AddInt64(&operation.processedCount, 1)
},
completedCallback: func() {
g.activeBootstrapsMutex.Lock()
defer g.activeBootstrapsMutex.Unlock()
operation.completed = true
g.logger.Info("Completed bootstrap generation for replica %s (keys: %d, duration: %v)",
replicaID, operation.processedCount, time.Since(operation.startTime))
},
cancelledCallback: func() {
g.activeBootstrapsMutex.Lock()
defer g.activeBootstrapsMutex.Unlock()
operation.cancelled = true
g.logger.Info("Cancelled bootstrap generation for replica %s (keys processed: %d)",
replicaID, operation.processedCount)
},
}
return trackingIterator, snapshotLSN, nil
}
// CancelBootstrapGeneration cancels an in-progress bootstrap generation
func (g *BootstrapGenerator) CancelBootstrapGeneration(replicaID string) bool {
g.activeBootstrapsMutex.Lock()
defer g.activeBootstrapsMutex.Unlock()
operation, exists := g.activeBootstraps[replicaID]
if !exists {
return false
}
if operation.completed || operation.cancelled {
return false
}
// Cancel the operation
operation.cancelled = true
operation.cancelFunc()
g.logger.Info("Cancelled bootstrap generation for replica %s", replicaID)
return true
}
// GetActiveBootstraps returns information about all active bootstrap operations
func (g *BootstrapGenerator) GetActiveBootstraps() map[string]map[string]interface{} {
g.activeBootstrapsMutex.RLock()
defer g.activeBootstrapsMutex.RUnlock()
result := make(map[string]map[string]interface{})
for replicaID, operation := range g.activeBootstraps {
// Skip completed operations after a certain time
if operation.completed && time.Since(operation.startTime) > 1*time.Hour {
continue
}
// Calculate progress
progress := float64(0)
if operation.keyCount > 0 {
progress = float64(operation.processedCount) / float64(operation.keyCount)
}
result[replicaID] = map[string]interface{}{
"start_time": operation.startTime,
"duration": time.Since(operation.startTime).String(),
"key_count": operation.keyCount,
"processed_count": operation.processedCount,
"progress": progress,
"snapshot_lsn": operation.snapshotLSN,
"completed": operation.completed,
"cancelled": operation.cancelled,
}
}
return result
}
// CleanupCompletedBootstraps removes tracking information for completed bootstrap operations
func (g *BootstrapGenerator) CleanupCompletedBootstraps() int {
g.activeBootstrapsMutex.Lock()
defer g.activeBootstrapsMutex.Unlock()
removed := 0
for replicaID, operation := range g.activeBootstraps {
// Remove operations that are completed or cancelled and older than 1 hour
if (operation.completed || operation.cancelled) && time.Since(operation.startTime) > 1*time.Hour {
delete(g.activeBootstraps, replicaID)
removed++
}
}
return removed
}
// trackingSnapshotIterator wraps a snapshot iterator to track progress
type trackingSnapshotIterator struct {
iterator SnapshotIterator
ctx context.Context
operation *bootstrapOperation
processedKey func(count int64)
completedCallback func()
cancelledCallback func()
closed bool
mu sync.Mutex
}
// Next returns the next key-value pair
func (t *trackingSnapshotIterator) Next() ([]byte, []byte, error) {
t.mu.Lock()
defer t.mu.Unlock()
if t.closed {
return nil, nil, io.EOF
}
// Check for cancellation
select {
case <-t.ctx.Done():
if !t.closed {
t.closed = true
t.cancelledCallback()
}
return nil, nil, ErrBootstrapGenerationCancelled
default:
// Continue
}
// Get next pair
key, value, err := t.iterator.Next()
if err == io.EOF {
if !t.closed {
t.closed = true
t.completedCallback()
}
return nil, nil, io.EOF
}
if err != nil {
return nil, nil, err
}
// Track progress
t.processedKey(1)
return key, value, nil
}
// Close closes the iterator
func (t *trackingSnapshotIterator) Close() error {
t.mu.Lock()
defer t.mu.Unlock()
if t.closed {
return nil
}
t.closed = true
// Call appropriate callback
select {
case <-t.ctx.Done():
t.cancelledCallback()
default:
t.completedCallback()
}
return t.iterator.Close()
}

621
pkg/replication/bootstrap_test.go
View File

@ -1,621 +0,0 @@
package replication
import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"sync"
"testing"
"time"
"github.com/KevoDB/kevo/pkg/common/log"
)
// MockStorageApplier implements StorageApplier for testing
type MockStorageApplier struct {
applied map[string][]byte
appliedCount int
appliedMu sync.Mutex
flushCount int
failApply bool
failFlush bool
}
func NewMockStorageApplier() *MockStorageApplier {
return &MockStorageApplier{
applied: make(map[string][]byte),
}
}
func (m *MockStorageApplier) Apply(key, value []byte) error {
m.appliedMu.Lock()
defer m.appliedMu.Unlock()
if m.failApply {
return ErrBootstrapFailed
}
m.applied[string(key)] = value
m.appliedCount++
return nil
}
func (m *MockStorageApplier) ApplyBatch(pairs []KeyValuePair) error {
m.appliedMu.Lock()
defer m.appliedMu.Unlock()
if m.failApply {
return ErrBootstrapFailed
}
for _, pair := range pairs {
m.applied[string(pair.Key)] = pair.Value
}
m.appliedCount += len(pairs)
return nil
}
func (m *MockStorageApplier) Flush() error {
m.appliedMu.Lock()
defer m.appliedMu.Unlock()
if m.failFlush {
return ErrBootstrapFailed
}
m.flushCount++
return nil
}
func (m *MockStorageApplier) GetAppliedCount() int {
m.appliedMu.Lock()
defer m.appliedMu.Unlock()
return m.appliedCount
}
func (m *MockStorageApplier) SetFailApply(fail bool) {
m.appliedMu.Lock()
defer m.appliedMu.Unlock()
m.failApply = fail
}
func (m *MockStorageApplier) SetFailFlush(fail bool) {
m.appliedMu.Lock()
defer m.appliedMu.Unlock()
m.failFlush = fail
}
// MockBootstrapIterator implements transport.BootstrapIterator for testing
type MockBootstrapIterator struct {
pairs []KeyValuePair
position int
snapshotLSN uint64
progress float64
failAfter int
closeError error
progressFunc func(pos int) float64
}
func NewMockBootstrapIterator(pairs []KeyValuePair, snapshotLSN uint64) *MockBootstrapIterator {
return &MockBootstrapIterator{
pairs: pairs,
snapshotLSN: snapshotLSN,
failAfter: -1, // Don't fail by default
progressFunc: func(pos int) float64 {
if len(pairs) == 0 {
return 1.0
}
return float64(pos) / float64(len(pairs))
},
}
}
func (m *MockBootstrapIterator) Next() ([]byte, []byte, error) {
if m.position >= len(m.pairs) {
return nil, nil, io.EOF
}
if m.failAfter > 0 && m.position >= m.failAfter {
return nil, nil, ErrBootstrapFailed
}
pair := m.pairs[m.position]
m.position++
m.progress = m.progressFunc(m.position)
return pair.Key, pair.Value, nil
}
func (m *MockBootstrapIterator) Close() error {
return m.closeError
}
func (m *MockBootstrapIterator) Progress() float64 {
return m.progress
}
func (m *MockBootstrapIterator) SetFailAfter(failAfter int) {
m.failAfter = failAfter
}
func (m *MockBootstrapIterator) SetCloseError(err error) {
m.closeError = err
}
// Helper function to create a temporary directory for testing
func createTempDir(t *testing.T) string {
dir, err := os.MkdirTemp("", "bootstrap-test-*")
if err != nil {
t.Fatalf("Failed to create temp dir: %v", err)
}
return dir
}
// Helper function to clean up temporary directory
func cleanupTempDir(t *testing.T, dir string) {
os.RemoveAll(dir)
}
// Define JSON helpers for tests
func testWriteJSONFile(file *os.File, v interface{}) error {
encoder := json.NewEncoder(file)
return encoder.Encode(v)
}
func testReadJSONFile(file *os.File, v interface{}) error {
decoder := json.NewDecoder(file)
return decoder.Decode(v)
}
// TestBootstrapManager_Basic tests basic bootstrap functionality
func TestBootstrapManager_Basic(t *testing.T) {
// Create test directory
tempDir := createTempDir(t)
defer cleanupTempDir(t, tempDir)
// Create test data
testData := []KeyValuePair{
{Key: []byte("key1"), Value: []byte("value1")},
{Key: []byte("key2"), Value: []byte("value2")},
{Key: []byte("key3"), Value: []byte("value3")},
{Key: []byte("key4"), Value: []byte("value4")},
{Key: []byte("key5"), Value: []byte("value5")},
}
// Create mock components
storageApplier := NewMockStorageApplier()
logger := log.GetDefaultLogger()
// Create bootstrap manager
manager, err := NewBootstrapManager(storageApplier, nil, tempDir, logger)
if err != nil {
t.Fatalf("Failed to create bootstrap manager: %v", err)
}
// Create mock bootstrap iterator
snapshotLSN := uint64(12345)
iterator := NewMockBootstrapIterator(testData, snapshotLSN)
// Start bootstrap process
err = manager.StartBootstrap("test-replica", iterator, 2)
if err != nil {
t.Fatalf("Failed to start bootstrap: %v", err)
}
// Wait for bootstrap to complete
for i := 0; i < 50; i++ {
if !manager.IsBootstrapInProgress() {
break
}
time.Sleep(100 * time.Millisecond)
}
// Verify bootstrap completed
if manager.IsBootstrapInProgress() {
t.Fatalf("Bootstrap did not complete in time")
}
// We don't check the exact count here, as it may include previously applied items
// and it's an implementation detail whether they get reapplied or skipped
appliedCount := storageApplier.GetAppliedCount()
if appliedCount < len(testData) {
t.Errorf("Expected at least %d applied items, got %d", len(testData), appliedCount)
}
// Verify bootstrap state
state := manager.GetBootstrapState()
if state == nil {
t.Fatalf("Bootstrap state is nil")
}
if !state.Completed {
t.Errorf("Bootstrap state should be marked as completed")
}
if state.AppliedKeys != len(testData) {
t.Errorf("Expected %d applied keys in state, got %d", len(testData), state.AppliedKeys)
}
if state.Progress != 1.0 {
t.Errorf("Expected progress 1.0, got %f", state.Progress)
}
}
// TestBootstrapManager_Resume tests bootstrap resumability
func TestBootstrapManager_Resume(t *testing.T) {
// Create test directory
tempDir := createTempDir(t)
defer cleanupTempDir(t, tempDir)
// Create test data
testData := []KeyValuePair{
{Key: []byte("key1"), Value: []byte("value1")},
{Key: []byte("key2"), Value: []byte("value2")},
{Key: []byte("key3"), Value: []byte("value3")},
{Key: []byte("key4"), Value: []byte("value4")},
{Key: []byte("key5"), Value: []byte("value5")},
{Key: []byte("key6"), Value: []byte("value6")},
{Key: []byte("key7"), Value: []byte("value7")},
{Key: []byte("key8"), Value: []byte("value8")},
{Key: []byte("key9"), Value: []byte("value9")},
{Key: []byte("key10"), Value: []byte("value10")},
}
// Create mock components
storageApplier := NewMockStorageApplier()
logger := log.GetDefaultLogger()
// Create bootstrap manager
manager, err := NewBootstrapManager(storageApplier, nil, tempDir, logger)
if err != nil {
t.Fatalf("Failed to create bootstrap manager: %v", err)
}
// Create initial bootstrap iterator that will fail after 2 items
snapshotLSN := uint64(12345)
iterator1 := NewMockBootstrapIterator(testData, snapshotLSN)
iterator1.SetFailAfter(2)
// Start first bootstrap attempt
err = manager.StartBootstrap("test-replica", iterator1, 2)
if err != nil {
t.Fatalf("Failed to start bootstrap: %v", err)
}
// Wait for the bootstrap to fail
for i := 0; i < 50; i++ {
if !manager.IsBootstrapInProgress() {
break
}
time.Sleep(100 * time.Millisecond)
}
// Verify bootstrap state shows failure
state1 := manager.GetBootstrapState()
if state1 == nil {
t.Fatalf("Bootstrap state is nil after failed attempt")
}
if state1.Completed {
t.Errorf("Bootstrap state should not be marked as completed after failure")
}
if state1.AppliedKeys != 2 {
t.Errorf("Expected 2 applied keys in state after failure, got %d", state1.AppliedKeys)
}
// Create a new bootstrap manager that should load the existing state
manager2, err := NewBootstrapManager(storageApplier, nil, tempDir, logger)
if err != nil {
t.Fatalf("Failed to create second bootstrap manager: %v", err)
}
// Create a new iterator for the resume
iterator2 := NewMockBootstrapIterator(testData, snapshotLSN)
// Start the resumed bootstrap
err = manager2.StartBootstrap("test-replica", iterator2, 2)
if err != nil {
t.Fatalf("Failed to start resumed bootstrap: %v", err)
}
// Wait for bootstrap to complete
for i := 0; i < 50; i++ {
if !manager2.IsBootstrapInProgress() {
break
}
time.Sleep(100 * time.Millisecond)
}
// Verify bootstrap completed
if manager2.IsBootstrapInProgress() {
t.Fatalf("Resumed bootstrap did not complete in time")
}
// We don't check the exact count here, as it may include previously applied items
// and it's an implementation detail whether they get reapplied or skipped
appliedCount := storageApplier.GetAppliedCount()
if appliedCount < len(testData) {
t.Errorf("Expected at least %d applied items, got %d", len(testData), appliedCount)
}
// Verify bootstrap state
state2 := manager2.GetBootstrapState()
if state2 == nil {
t.Fatalf("Bootstrap state is nil after resume")
}
if !state2.Completed {
t.Errorf("Bootstrap state should be marked as completed after resume")
}
if state2.AppliedKeys != len(testData) {
t.Errorf("Expected %d applied keys in state after resume, got %d", len(testData), state2.AppliedKeys)
}
if state2.Progress != 1.0 {
t.Errorf("Expected progress 1.0 after resume, got %f", state2.Progress)
}
}
// TestBootstrapManager_WALTransition tests transition to WAL replication
func TestBootstrapManager_WALTransition(t *testing.T) {
// Create test directory
tempDir := createTempDir(t)
defer cleanupTempDir(t, tempDir)
// Create test data
testData := []KeyValuePair{
{Key: []byte("key1"), Value: []byte("value1")},
{Key: []byte("key2"), Value: []byte("value2")},
{Key: []byte("key3"), Value: []byte("value3")},
}
// Create mock components
storageApplier := NewMockStorageApplier()
// Create mock WAL applier
walApplier := &MockWALApplier{
mu: sync.RWMutex{},
highestApplied: uint64(1000),
}
logger := log.GetDefaultLogger()
// Create bootstrap manager
manager, err := NewBootstrapManager(storageApplier, walApplier, tempDir, logger)
if err != nil {
t.Fatalf("Failed to create bootstrap manager: %v", err)
}
// Create mock bootstrap iterator
snapshotLSN := uint64(12345)
iterator := NewMockBootstrapIterator(testData, snapshotLSN)
// Set the snapshot LSN
manager.SetSnapshotLSN(snapshotLSN)
// Start bootstrap process
err = manager.StartBootstrap("test-replica", iterator, 2)
if err != nil {
t.Fatalf("Failed to start bootstrap: %v", err)
}
// Wait for bootstrap to complete
for i := 0; i < 50; i++ {
if !manager.IsBootstrapInProgress() {
break
}
time.Sleep(100 * time.Millisecond)
}
// Verify bootstrap completed
if manager.IsBootstrapInProgress() {
t.Fatalf("Bootstrap did not complete in time")
}
// Transition to WAL replication
err = manager.TransitionToWALReplication()
if err != nil {
t.Fatalf("Failed to transition to WAL replication: %v", err)
}
// Verify WAL applier's highest applied LSN was updated
walApplier.mu.RLock()
highestApplied := walApplier.highestApplied
walApplier.mu.RUnlock()
if highestApplied != snapshotLSN {
t.Errorf("Expected WAL applier highest applied LSN to be %d, got %d", snapshotLSN, highestApplied)
}
}
// TestBootstrapGenerator_Basic tests basic bootstrap generator functionality
func TestBootstrapGenerator_Basic(t *testing.T) {
// Create test data
testData := []KeyValuePair{
{Key: []byte("key1"), Value: []byte("value1")},
{Key: []byte("key2"), Value: []byte("value2")},
{Key: []byte("key3"), Value: []byte("value3")},
{Key: []byte("key4"), Value: []byte("value4")},
{Key: []byte("key5"), Value: []byte("value5")},
}
// Create mock storage snapshot
mockSnapshot := NewMemoryStorageSnapshot(testData)
// Create mock snapshot provider
snapshotProvider := &MockSnapshotProvider{
snapshot: mockSnapshot,
}
// Create mock replicator
replicator := &WALReplicator{
highestTimestamp: 12345,
}
// Create bootstrap generator
generator := NewBootstrapGenerator(snapshotProvider, replicator, nil)
// Start bootstrap generation
ctx := context.Background()
iterator, snapshotLSN, err := generator.StartBootstrapGeneration(ctx, "test-replica")
if err != nil {
t.Fatalf("Failed to start bootstrap generation: %v", err)
}
// Verify snapshotLSN
if snapshotLSN != 12345 {
t.Errorf("Expected snapshot LSN 12345, got %d", snapshotLSN)
}
// Read all data
var receivedData []KeyValuePair
for {
key, value, err := iterator.Next()
if err == io.EOF {
break
}
if err != nil {
t.Fatalf("Error reading from iterator: %v", err)
}
receivedData = append(receivedData, KeyValuePair{
Key: key,
Value: value,
})
}
// Verify all data was received
if len(receivedData) != len(testData) {
t.Errorf("Expected %d items, got %d", len(testData), len(receivedData))
}
// Verify active bootstraps
activeBootstraps := generator.GetActiveBootstraps()
if len(activeBootstraps) != 1 {
t.Errorf("Expected 1 active bootstrap, got %d", len(activeBootstraps))
}
replicaInfo, exists := activeBootstraps["test-replica"]
if !exists {
t.Fatalf("Expected to find test-replica in active bootstraps")
}
completed, ok := replicaInfo["completed"].(bool)
if !ok {
t.Fatalf("Expected 'completed' to be a boolean")
}
if !completed {
t.Errorf("Expected bootstrap to be marked as completed")
}
}
// TestBootstrapGenerator_Cancel tests cancellation of bootstrap generation
func TestBootstrapGenerator_Cancel(t *testing.T) {
// Create test data
var testData []KeyValuePair
for i := 0; i < 1000; i++ {
testData = append(testData, KeyValuePair{
Key: []byte(fmt.Sprintf("key%d", i)),
Value: []byte(fmt.Sprintf("value%d", i)),
})
}
// Create mock storage snapshot
mockSnapshot := NewMemoryStorageSnapshot(testData)
// Create mock snapshot provider
snapshotProvider := &MockSnapshotProvider{
snapshot: mockSnapshot,
}
// Create mock replicator
replicator := &WALReplicator{
highestTimestamp: 12345,
}
// Create bootstrap generator
generator := NewBootstrapGenerator(snapshotProvider, replicator, nil)
// Start bootstrap generation
ctx := context.Background()
iterator, _, err := generator.StartBootstrapGeneration(ctx, "test-replica")
if err != nil {
t.Fatalf("Failed to start bootstrap generation: %v", err)
}
// Read a few items
for i := 0; i < 5; i++ {
_, _, err := iterator.Next()
if err != nil {
t.Fatalf("Error reading from iterator: %v", err)
}
}
// Cancel the bootstrap
cancelled := generator.CancelBootstrapGeneration("test-replica")
if !cancelled {
t.Errorf("Expected to cancel bootstrap, but CancelBootstrapGeneration returned false")
}
// Try to read more items, should get cancelled error
_, _, err = iterator.Next()
if err != ErrBootstrapGenerationCancelled {
t.Errorf("Expected ErrBootstrapGenerationCancelled, got %v", err)
}
// Verify active bootstraps
activeBootstraps := generator.GetActiveBootstraps()
replicaInfo, exists := activeBootstraps["test-replica"]
if !exists {
t.Fatalf("Expected to find test-replica in active bootstraps")
}
cancelled, ok := replicaInfo["cancelled"].(bool)
if !ok {
t.Fatalf("Expected 'cancelled' to be a boolean")
}
if !cancelled {
t.Errorf("Expected bootstrap to be marked as cancelled")
}
}
// MockSnapshotProvider implements StorageSnapshotProvider for testing
type MockSnapshotProvider struct {
snapshot StorageSnapshot
createError error
}
func (m *MockSnapshotProvider) CreateSnapshot() (StorageSnapshot, error) {
if m.createError != nil {
return nil, m.createError
}
return m.snapshot, nil
}
// MockWALReplicator simulates WALReplicator for tests
type MockWALReplicator struct {
highestTimestamp uint64
}
func (r *MockWALReplicator) GetHighestTimestamp() uint64 {
return r.highestTimestamp
}
// MockWALApplier simulates WALApplier for tests
type MockWALApplier struct {
mu sync.RWMutex
highestApplied uint64
}
func (a *MockWALApplier) ResetHighestApplied(lsn uint64) {
a.mu.Lock()
defer a.mu.Unlock()
a.highestApplied = lsn
}

30
pkg/replication/interfaces.go
View File

@ -1,30 +0,0 @@
package replication
import (
"github.com/KevoDB/kevo/pkg/wal"
)
// EntryReplicator defines the interface for replicating WAL entries
type EntryReplicator interface {
// GetHighestTimestamp returns the highest Lamport timestamp seen
GetHighestTimestamp() uint64
// AddProcessor registers a processor to handle replicated entries
AddProcessor(processor EntryProcessor)
// RemoveProcessor unregisters a processor
RemoveProcessor(processor EntryProcessor)
// GetEntriesAfter retrieves entries after a given position
GetEntriesAfter(pos ReplicationPosition) ([]*wal.Entry, error)
}
// EntryApplier defines the interface for applying WAL entries
type EntryApplier interface {
// ResetHighestApplied sets the highest applied LSN
ResetHighestApplied(lsn uint64)
}
// Ensure our concrete types implement these interfaces
var _ EntryReplicator = (*WALReplicator)(nil)
var _ EntryApplier = (*WALApplier)(nil)

6
pkg/replication/serialization.go
View File

@ -291,7 +291,7 @@ func (s *BatchSerializer) DeserializeBatch(data []byte) ([]*wal.Entry, error) {
offset := 4 // Skip checksum offset := 4 // Skip checksum
// Read entry count // Read entry count
count := binary.LittleEndian.Uint32(data[offset : offset+4]) count := binary.LittleEndian.Uint32(data[offset:offset+4])
offset += 4 offset += 4
// Read base timestamp (we don't use this currently, but read past it) // Read base timestamp (we don't use this currently, but read past it)
@ -311,7 +311,7 @@ func (s *BatchSerializer) DeserializeBatch(data []byte) ([]*wal.Entry, error) {
} }
// Read entry size // Read entry size
entrySize := binary.LittleEndian.Uint32(data[offset : offset+4]) entrySize := binary.LittleEndian.Uint32(data[offset:offset+4])
offset += 4 offset += 4
// Validate entry size // Validate entry size
@ -320,7 +320,7 @@ func (s *BatchSerializer) DeserializeBatch(data []byte) ([]*wal.Entry, error) {
} }
// Deserialize entry // Deserialize entry
entry, err := s.entrySerializer.DeserializeEntry(data[offset : offset+int(entrySize)]) entry, err := s.entrySerializer.DeserializeEntry(data[offset:offset+int(entrySize)])
if err != nil { if err != nil {
return nil, err return nil, err
} }

2
pkg/replication/serialization_test.go
View File

@ -412,7 +412,7 @@ func TestSerializeToBuffer(t *testing.T) {
} }
// Test with too small buffer // Test with too small buffer
smallBuffer := make([]byte, estimatedSize-1) smallBuffer := make([]byte, estimatedSize - 1)
_, err = serializer.SerializeEntryToBuffer(entry, smallBuffer) _, err = serializer.SerializeEntryToBuffer(entry, smallBuffer)
if err != ErrBufferTooSmall { if err != ErrBufferTooSmall {
t.Errorf("Expected buffer too small error, got %v", err) t.Errorf("Expected buffer too small error, got %v", err)

4
pkg/replication/storage_snapshot.go
View File

@ -33,8 +33,8 @@ type StorageSnapshotProvider interface {
// MemoryStorageSnapshot is a simple in-memory implementation of StorageSnapshot // MemoryStorageSnapshot is a simple in-memory implementation of StorageSnapshot
// Useful for testing or small datasets // Useful for testing or small datasets
type MemoryStorageSnapshot struct { type MemoryStorageSnapshot struct {
Pairs []KeyValuePair Pairs []KeyValuePair
position int position int
} }
// KeyValuePair represents a key-value pair in storage // KeyValuePair represents a key-value pair in storage

194
pkg/transport/access_control.go
View File

@ -1,194 +0,0 @@
package transport
import (
"errors"
"sync"
"time"
)
var (
// ErrAccessDenied indicates the replica is not authorized
ErrAccessDenied = errors.New("access denied")
// ErrAuthenticationFailed indicates authentication failure
ErrAuthenticationFailed = errors.New("authentication failed")
// ErrInvalidToken indicates an invalid or expired token
ErrInvalidToken = errors.New("invalid or expired token")
)
// AuthMethod defines authentication methods for replicas
type AuthMethod string
const (
// AuthNone means no authentication required (not recommended for production)
AuthNone AuthMethod = "none"
// AuthToken uses a pre-shared token for authentication
AuthToken AuthMethod = "token"
)
// AccessLevel defines permission levels for replicas
type AccessLevel int
const (
// AccessNone has no permissions
AccessNone AccessLevel = iota
// AccessReadOnly can only read from the primary
AccessReadOnly
// AccessReadWrite can read and receive updates from the primary
AccessReadWrite
// AccessAdmin has full control including management operations
AccessAdmin
)
// ReplicaCredentials contains authentication information for a replica
type ReplicaCredentials struct {
ReplicaID string
AuthMethod AuthMethod
Token string // Token for authentication (in a production system, this would be hashed)
AccessLevel AccessLevel
ExpiresAt time.Time // Token expiration time (zero means no expiration)
}
// AccessController manages authentication and authorization for replicas
type AccessController struct {
mu sync.RWMutex
credentials map[string]*ReplicaCredentials // Map of replicaID -> credentials
enabled bool
defaultAuth AuthMethod
}
// NewAccessController creates a new access controller
func NewAccessController(enabled bool, defaultAuth AuthMethod) *AccessController {
return &AccessController{
credentials: make(map[string]*ReplicaCredentials),
enabled: enabled,
defaultAuth: defaultAuth,
}
}
// IsEnabled returns whether access control is enabled
func (ac *AccessController) IsEnabled() bool {
return ac.enabled
}
// DefaultAuthMethod returns the default authentication method
func (ac *AccessController) DefaultAuthMethod() AuthMethod {
return ac.defaultAuth
}
// RegisterReplica registers a new replica with credentials
func (ac *AccessController) RegisterReplica(creds *ReplicaCredentials) error {
if !ac.enabled {
// If access control is disabled, we still register the replica but don't enforce controls
creds.AccessLevel = AccessAdmin
}
ac.mu.Lock()
defer ac.mu.Unlock()
// Store credentials (in a real system, we'd hash tokens here)
ac.credentials[creds.ReplicaID] = creds
return nil
}
// RemoveReplica removes a replica's credentials
func (ac *AccessController) RemoveReplica(replicaID string) {
ac.mu.Lock()
defer ac.mu.Unlock()
delete(ac.credentials, replicaID)
}
// AuthenticateReplica authenticates a replica based on the provided credentials
func (ac *AccessController) AuthenticateReplica(replicaID, token string) error {
if !ac.enabled {
return nil // Authentication disabled
}
ac.mu.RLock()
defer ac.mu.RUnlock()
creds, exists := ac.credentials[replicaID]
if !exists {
return ErrAccessDenied
}
// Check if credentials are expired
if !creds.ExpiresAt.IsZero() && time.Now().After(creds.ExpiresAt) {
return ErrInvalidToken
}
// Authenticate based on method
switch creds.AuthMethod {
case AuthNone:
return nil // No authentication required
case AuthToken:
// In a real system, we'd compare hashed tokens
if token != creds.Token {
return ErrAuthenticationFailed
}
return nil
default:
return ErrAuthenticationFailed
}
}
// AuthorizeReplicaAction checks if a replica has permission for an action
func (ac *AccessController) AuthorizeReplicaAction(replicaID string, requiredLevel AccessLevel) error {
if !ac.enabled {
return nil // Authorization disabled
}
ac.mu.RLock()
defer ac.mu.RUnlock()
creds, exists := ac.credentials[replicaID]
if !exists {
return ErrAccessDenied
}
// Check permissions
if creds.AccessLevel < requiredLevel {
return ErrAccessDenied
}
return nil
}
// GetReplicaAccessLevel returns the access level for a replica
func (ac *AccessController) GetReplicaAccessLevel(replicaID string) (AccessLevel, error) {
if !ac.enabled {
return AccessAdmin, nil // If disabled, return highest access level
}
ac.mu.RLock()
defer ac.mu.RUnlock()
creds, exists := ac.credentials[replicaID]
if !exists {
return AccessNone, ErrAccessDenied
}
return creds.AccessLevel, nil
}
// SetReplicaAccessLevel updates the access level for a replica
func (ac *AccessController) SetReplicaAccessLevel(replicaID string, level AccessLevel) error {
ac.mu.Lock()
defer ac.mu.Unlock()
creds, exists := ac.credentials[replicaID]
if !exists {
return ErrAccessDenied
}
creds.AccessLevel = level
return nil
}

159
pkg/transport/bootstrap_metrics.go
View File

@ -1,159 +0,0 @@
package transport
import (
"sync"
"time"
)
// BootstrapMetrics contains metrics related to bootstrap operations
type BootstrapMetrics struct {
// Bootstrap counts per replica
bootstrapCount map[string]int
bootstrapCountLock sync.RWMutex
// Bootstrap progress per replica
bootstrapProgress map[string]float64
bootstrapProgressLock sync.RWMutex
// Last successful bootstrap time per replica
lastBootstrap map[string]time.Time
lastBootstrapLock sync.RWMutex
}
// newBootstrapMetrics creates a new bootstrap metrics container
func newBootstrapMetrics() *BootstrapMetrics {
return &BootstrapMetrics{
bootstrapCount: make(map[string]int),
bootstrapProgress: make(map[string]float64),
lastBootstrap: make(map[string]time.Time),
}
}
// IncrementBootstrapCount increments the bootstrap count for a replica
func (m *BootstrapMetrics) IncrementBootstrapCount(replicaID string) {
m.bootstrapCountLock.Lock()
defer m.bootstrapCountLock.Unlock()
m.bootstrapCount[replicaID]++
}
// GetBootstrapCount gets the bootstrap count for a replica
func (m *BootstrapMetrics) GetBootstrapCount(replicaID string) int {
m.bootstrapCountLock.RLock()
defer m.bootstrapCountLock.RUnlock()
return m.bootstrapCount[replicaID]
}
// UpdateBootstrapProgress updates the bootstrap progress for a replica
func (m *BootstrapMetrics) UpdateBootstrapProgress(replicaID string, progress float64) {
m.bootstrapProgressLock.Lock()
defer m.bootstrapProgressLock.Unlock()
m.bootstrapProgress[replicaID] = progress
}
// GetBootstrapProgress gets the bootstrap progress for a replica
func (m *BootstrapMetrics) GetBootstrapProgress(replicaID string) float64 {
m.bootstrapProgressLock.RLock()
defer m.bootstrapProgressLock.RUnlock()
return m.bootstrapProgress[replicaID]
}
// MarkBootstrapCompleted marks a bootstrap as completed for a replica
func (m *BootstrapMetrics) MarkBootstrapCompleted(replicaID string) {
m.lastBootstrapLock.Lock()
defer m.lastBootstrapLock.Unlock()
m.lastBootstrap[replicaID] = time.Now()
}
// GetLastBootstrapTime gets the last bootstrap time for a replica
func (m *BootstrapMetrics) GetLastBootstrapTime(replicaID string) (time.Time, bool) {
m.lastBootstrapLock.RLock()
defer m.lastBootstrapLock.RUnlock()
ts, exists := m.lastBootstrap[replicaID]
return ts, exists
}
// GetAllBootstrapMetrics returns all bootstrap metrics as a map
func (m *BootstrapMetrics) GetAllBootstrapMetrics() map[string]map[string]interface{} {
result := make(map[string]map[string]interface{})
// Get all replica IDs
var replicaIDs []string
m.bootstrapCountLock.RLock()
for id := range m.bootstrapCount {
replicaIDs = append(replicaIDs, id)
}
m.bootstrapCountLock.RUnlock()
m.bootstrapProgressLock.RLock()
for id := range m.bootstrapProgress {
found := false
for _, existingID := range replicaIDs {
if existingID == id {
found = true
break
}
}
if !found {
replicaIDs = append(replicaIDs, id)
}
}
m.bootstrapProgressLock.RUnlock()
m.lastBootstrapLock.RLock()
for id := range m.lastBootstrap {
found := false
for _, existingID := range replicaIDs {
if existingID == id {
found = true
break
}
}
if !found {
replicaIDs = append(replicaIDs, id)
}
}
m.lastBootstrapLock.RUnlock()
// Build metrics for each replica
for _, id := range replicaIDs {
replicaMetrics := make(map[string]interface{})
// Add bootstrap count
m.bootstrapCountLock.RLock()
if count, exists := m.bootstrapCount[id]; exists {
replicaMetrics["bootstrap_count"] = count
} else {
replicaMetrics["bootstrap_count"] = 0
}
m.bootstrapCountLock.RUnlock()
// Add bootstrap progress
m.bootstrapProgressLock.RLock()
if progress, exists := m.bootstrapProgress[id]; exists {
replicaMetrics["bootstrap_progress"] = progress
} else {
replicaMetrics["bootstrap_progress"] = 0.0
}
m.bootstrapProgressLock.RUnlock()
// Add last bootstrap time
m.lastBootstrapLock.RLock()
if ts, exists := m.lastBootstrap[id]; exists {
replicaMetrics["last_bootstrap"] = ts
} else {
replicaMetrics["last_bootstrap"] = nil
}
m.lastBootstrapLock.RUnlock()
result[id] = replicaMetrics
}
return result
}

98
pkg/transport/errors.go
View File

@ -1,98 +0,0 @@
package transport
import (
"errors"
"fmt"
)
// Common error types for transport and reliability
var (
// ErrMaxRetriesExceeded indicates the operation failed after all retries
ErrMaxRetriesExceeded = errors.New("maximum retries exceeded")
// ErrCircuitOpen indicates the circuit breaker is open
ErrCircuitOpen = errors.New("circuit breaker is open")
// ErrConnectionFailed indicates a connection failure
ErrConnectionFailed = errors.New("connection failed")
// ErrDisconnected indicates the connection was lost
ErrDisconnected = errors.New("connection was lost")
// ErrReconnectionFailed indicates reconnection attempts failed
ErrReconnectionFailed = errors.New("reconnection failed")
// ErrStreamClosed indicates the stream was closed
ErrStreamClosed = errors.New("stream was closed")
// ErrInvalidState indicates an invalid state
ErrInvalidState = errors.New("invalid state")
// ErrReplicaNotRegistered indicates the replica is not registered
ErrReplicaNotRegistered = errors.New("replica not registered")
)
// TemporaryError wraps an error with information about whether it's temporary
type TemporaryError struct {
Err error
IsTemp bool
RetryAfter int // Suggested retry after duration in milliseconds
}
// Error returns the error string
func (e *TemporaryError) Error() string {
if e.RetryAfter > 0 {
return fmt.Sprintf("%v (temporary: %v, retry after: %dms)", e.Err, e.IsTemp, e.RetryAfter)
}
return fmt.Sprintf("%v (temporary: %v)", e.Err, e.IsTemp)
}
// Unwrap returns the wrapped error
func (e *TemporaryError) Unwrap() error {
return e.Err
}
// IsTemporary returns whether the error is temporary
func (e *TemporaryError) IsTemporary() bool {
return e.IsTemp
}
// GetRetryAfter returns the suggested retry after duration
func (e *TemporaryError) GetRetryAfter() int {
return e.RetryAfter
}
// NewTemporaryError creates a new temporary error
func NewTemporaryError(err error, isTemp bool) *TemporaryError {
return &TemporaryError{
Err: err,
IsTemp: isTemp,
}
}
// NewTemporaryErrorWithRetry creates a new temporary error with retry hint
func NewTemporaryErrorWithRetry(err error, isTemp bool, retryAfter int) *TemporaryError {
return &TemporaryError{
Err: err,
IsTemp: isTemp,
RetryAfter: retryAfter,
}
}
// IsTemporary checks if an error is a temporary error
func IsTemporary(err error) bool {
var tempErr *TemporaryError
if errors.As(err, &tempErr) {
return tempErr.IsTemporary()
}
return false
}
// GetRetryAfter extracts the retry hint from an error
func GetRetryAfter(err error) int {
var tempErr *TemporaryError
if errors.As(err, &tempErr) {
return tempErr.GetRetryAfter()
}
return 0
}

150
pkg/transport/errors_test.go
View File

@ -1,150 +0,0 @@
package transport
import (
"errors"
"fmt"
"strings"
"testing"
)
func TestTemporaryError(t *testing.T) {
t.Run("Basic error wrapping", func(t *testing.T) {
baseErr := errors.New("base error")
tempErr := NewTemporaryError(baseErr, true)
if !tempErr.IsTemporary() {
t.Error("Expected IsTemporary() to return true")
}
if tempErr.GetRetryAfter() != 0 {
t.Errorf("Expected GetRetryAfter() to return 0, got %d", tempErr.GetRetryAfter())
}
if !strings.Contains(tempErr.Error(), baseErr.Error()) {
t.Errorf("Expected Error() to contain the base error message")
}
if !strings.Contains(tempErr.Error(), "temporary: true") {
t.Errorf("Expected Error() to indicate temporary status")
}
// Test unwrap
unwrapped := errors.Unwrap(tempErr)
if unwrapped != baseErr {
t.Errorf("Expected Unwrap() to return the base error")
}
})
t.Run("Error with retry hint", func(t *testing.T) {
baseErr := errors.New("connection refused")
retryAfter := 1000 // 1 second
tempErr := NewTemporaryErrorWithRetry(baseErr, true, retryAfter)
if !tempErr.IsTemporary() {
t.Error("Expected IsTemporary() to return true")
}
if tempErr.GetRetryAfter() != retryAfter {
t.Errorf("Expected GetRetryAfter() to return %d, got %d", retryAfter, tempErr.GetRetryAfter())
}
if !strings.Contains(tempErr.Error(), baseErr.Error()) {
t.Errorf("Expected Error() to contain the base error message")
}
if !strings.Contains(tempErr.Error(), "temporary: true") {
t.Errorf("Expected Error() to indicate temporary status")
}
if !strings.Contains(tempErr.Error(), "retry after: 1000ms") {
t.Errorf("Expected Error() to include retry hint")
}
})
t.Run("Non-temporary error", func(t *testing.T) {
baseErr := errors.New("permanent error")
tempErr := NewTemporaryError(baseErr, false)
if tempErr.IsTemporary() {
t.Error("Expected IsTemporary() to return false")
}
if !strings.Contains(tempErr.Error(), "temporary: false") {
t.Errorf("Expected Error() to indicate non-temporary status")
}
})
}
func TestIsTemporary(t *testing.T) {
t.Run("With TemporaryError", func(t *testing.T) {
err := NewTemporaryError(errors.New("test error"), true)
if !IsTemporary(err) {
t.Error("Expected IsTemporary() to return true")
}
err = NewTemporaryError(errors.New("test error"), false)
if IsTemporary(err) {
t.Error("Expected IsTemporary() to return false")
}
})
t.Run("With regular error", func(t *testing.T) {
err := errors.New("regular error")
if IsTemporary(err) {
t.Error("Expected IsTemporary() to return false for regular error")
}
})
t.Run("With wrapped error", func(t *testing.T) {
tempErr := NewTemporaryError(errors.New("base error"), true)
wrappedErr := errors.New("wrapper: " + tempErr.Error())
wrappedTempErr := fmt.Errorf("wrapper: %w", tempErr)
// Regular wrapping doesn't preserve error type
if IsTemporary(wrappedErr) {
t.Error("Expected IsTemporary() to return false for string-wrapped error")
}
// fmt.Errorf with %w preserves error type
if !IsTemporary(wrappedTempErr) {
t.Error("Expected IsTemporary() to return true for properly wrapped error")
}
})
}
func TestGetRetryAfter(t *testing.T) {
t.Run("With retry hint", func(t *testing.T) {
retryAfter := 2000 // 2 seconds
err := NewTemporaryErrorWithRetry(errors.New("test error"), true, retryAfter)
if GetRetryAfter(err) != retryAfter {
t.Errorf("Expected GetRetryAfter() to return %d, got %d", retryAfter, GetRetryAfter(err))
}
})
t.Run("Without retry hint", func(t *testing.T) {
err := NewTemporaryError(errors.New("test error"), true)
if GetRetryAfter(err) != 0 {
t.Errorf("Expected GetRetryAfter() to return 0, got %d", GetRetryAfter(err))
}
})
t.Run("With regular error", func(t *testing.T) {
err := errors.New("regular error")
if GetRetryAfter(err) != 0 {
t.Errorf("Expected GetRetryAfter() to return 0, got %d", GetRetryAfter(err))
}
})
t.Run("With wrapped error", func(t *testing.T) {
retryAfter := 3000 // 3 seconds
tempErr := NewTemporaryErrorWithRetry(errors.New("base error"), true, retryAfter)
wrappedTempErr := fmt.Errorf("wrapper: %w", tempErr)
if GetRetryAfter(wrappedTempErr) != retryAfter {
t.Errorf("Expected GetRetryAfter() to return %d, got %d", retryAfter, GetRetryAfter(wrappedTempErr))
}
})
}

10
pkg/transport/registry.go
View File

@ -7,9 +7,9 @@ import (
// registry implements the Registry interface // registry implements the Registry interface
type registry struct { type registry struct {
mu sync.RWMutex mu sync.RWMutex
clientFactories map[string]ClientFactory clientFactories map[string]ClientFactory
serverFactories map[string]ServerFactory serverFactories map[string]ServerFactory
replicationClientFactories map[string]ReplicationClientFactory replicationClientFactories map[string]ReplicationClientFactory
replicationServerFactories map[string]ReplicationServerFactory replicationServerFactories map[string]ReplicationServerFactory
} }
@ -17,8 +17,8 @@ type registry struct {
// NewRegistry creates a new transport registry // NewRegistry creates a new transport registry
func NewRegistry() Registry { func NewRegistry() Registry {
return &registry{ return &registry{
clientFactories: make(map[string]ClientFactory), clientFactories: make(map[string]ClientFactory),
serverFactories: make(map[string]ServerFactory), serverFactories: make(map[string]ServerFactory),
replicationClientFactories: make(map[string]ReplicationClientFactory), replicationClientFactories: make(map[string]ReplicationClientFactory),
replicationServerFactories: make(map[string]ReplicationServerFactory), replicationServerFactories: make(map[string]ReplicationServerFactory),
} }

310
pkg/transport/replica_persistence.go
View File

@ -1,310 +0,0 @@
package transport
import (
"encoding/json"
"errors"
"os"
"path/filepath"
"sync"
"time"
)
var (
// ErrPersistenceDisabled indicates persistence operations cannot be performed
ErrPersistenceDisabled = errors.New("persistence is disabled")
// ErrInvalidReplicaData indicates the stored replica data is invalid
ErrInvalidReplicaData = errors.New("invalid replica data")
)
// PersistentReplicaInfo contains replica information that can be persisted
type PersistentReplicaInfo struct {
ID string `json:"id"`
Address string `json:"address"`
Role string `json:"role"`
LastSeen int64 `json:"last_seen"`
CurrentLSN uint64 `json:"current_lsn"`
Credentials *ReplicaCredentials `json:"credentials,omitempty"`
}
// ReplicaPersistence manages persistence of replica information
type ReplicaPersistence struct {
mu sync.RWMutex
dataDir string
enabled bool
autoSave bool
replicas map[string]*PersistentReplicaInfo
dirty bool
lastSave time.Time
saveTimer *time.Timer
}
// NewReplicaPersistence creates a new persistence manager
func NewReplicaPersistence(dataDir string, enabled bool, autoSave bool) (*ReplicaPersistence, error) {
rp := &ReplicaPersistence{
dataDir: dataDir,
enabled: enabled,
autoSave: autoSave,
replicas: make(map[string]*PersistentReplicaInfo),
}
// Create data directory if it doesn't exist
if enabled {
if err := os.MkdirAll(dataDir, 0755); err != nil {
return nil, err
}
// Load existing data
if err := rp.Load(); err != nil {
return nil, err
}
// Start auto-save timer if needed
if autoSave {
rp.saveTimer = time.AfterFunc(10*time.Second, rp.autoSaveFunc)
}
}
return rp, nil
}
// autoSaveFunc is called periodically to save replica data
func (rp *ReplicaPersistence) autoSaveFunc() {
rp.mu.RLock()
dirty := rp.dirty
rp.mu.RUnlock()
if dirty {
if err := rp.Save(); err != nil {
// In a production system, this should be logged properly
println("Error auto-saving replica data:", err.Error())
}
}
// Reschedule timer
rp.saveTimer.Reset(10 * time.Second)
}
// FromReplicaInfo converts a ReplicaInfo to a persistent form
func (rp *ReplicaPersistence) FromReplicaInfo(info *ReplicaInfo, creds *ReplicaCredentials) *PersistentReplicaInfo {
return &PersistentReplicaInfo{
ID: info.ID,
Address: info.Address,
Role: string(info.Role),
LastSeen: info.LastSeen.UnixMilli(),
CurrentLSN: info.CurrentLSN,
Credentials: creds,
}
}
// ToReplicaInfo converts from persistent form to ReplicaInfo
func (rp *ReplicaPersistence) ToReplicaInfo(pinfo *PersistentReplicaInfo) *ReplicaInfo {
info := &ReplicaInfo{
ID: pinfo.ID,
Address: pinfo.Address,
Role: ReplicaRole(pinfo.Role),
LastSeen: time.UnixMilli(pinfo.LastSeen),
CurrentLSN: pinfo.CurrentLSN,
}
return info
}
// Save persists all replica information to disk
func (rp *ReplicaPersistence) Save() error {
if !rp.enabled {
return ErrPersistenceDisabled
}
rp.mu.Lock()
defer rp.mu.Unlock()
// Nothing to save if no replicas or not dirty
if len(rp.replicas) == 0 || !rp.dirty {
return nil
}
// Save each replica to its own file for better concurrency
for id, replica := range rp.replicas {
filename := filepath.Join(rp.dataDir, "replica_"+id+".json")
data, err := json.MarshalIndent(replica, "", " ")
if err != nil {
return err
}
// Write to temp file first, then rename for atomic update
tempFile := filename + ".tmp"
if err := os.WriteFile(tempFile, data, 0644); err != nil {
return err
}
if err := os.Rename(tempFile, filename); err != nil {
return err
}
}
rp.dirty = false
rp.lastSave = time.Now()
return nil
}
// IsEnabled returns whether persistence is enabled
func (rp *ReplicaPersistence) IsEnabled() bool {
return rp.enabled
}
// Load reads all persisted replica information from disk
func (rp *ReplicaPersistence) Load() error {
if !rp.enabled {
return ErrPersistenceDisabled
}
rp.mu.Lock()
defer rp.mu.Unlock()
// Clear existing data
rp.replicas = make(map[string]*PersistentReplicaInfo)
// Find all replica files
pattern := filepath.Join(rp.dataDir, "replica_*.json")
files, err := filepath.Glob(pattern)
if err != nil {
return err
}
// Load each file
for _, file := range files {
data, err := os.ReadFile(file)
if err != nil {
// Skip files with read errors
continue
}
var replica PersistentReplicaInfo
if err := json.Unmarshal(data, &replica); err != nil {
// Skip files with parse errors
continue
}
// Validate replica data
if replica.ID == "" {
continue
}
rp.replicas[replica.ID] = &replica
}
rp.dirty = false
return nil
}
// SaveReplica persists a single replica's information
func (rp *ReplicaPersistence) SaveReplica(info *ReplicaInfo, creds *ReplicaCredentials) error {
if !rp.enabled {
return ErrPersistenceDisabled
}
if info == nil || info.ID == "" {
return ErrInvalidReplicaData
}
pinfo := rp.FromReplicaInfo(info, creds)
rp.mu.Lock()
rp.replicas[info.ID] = pinfo
rp.dirty = true
// For immediate save option
shouldSave := !rp.autoSave
rp.mu.Unlock()
// Save immediately if auto-save is disabled
if shouldSave {
return rp.Save()
}
return nil
}
// LoadReplica loads a single replica's information
func (rp *ReplicaPersistence) LoadReplica(id string) (*ReplicaInfo, *ReplicaCredentials, error) {
if !rp.enabled {
return nil, nil, ErrPersistenceDisabled
}
if id == "" {
return nil, nil, ErrInvalidReplicaData
}
rp.mu.RLock()
defer rp.mu.RUnlock()
pinfo, exists := rp.replicas[id]
if !exists {
return nil, nil, nil // Not found but not an error
}
return rp.ToReplicaInfo(pinfo), pinfo.Credentials, nil
}
// DeleteReplica removes a replica's persisted information
func (rp *ReplicaPersistence) DeleteReplica(id string) error {
if !rp.enabled {
return ErrPersistenceDisabled
}
if id == "" {
return ErrInvalidReplicaData
}
rp.mu.Lock()
defer rp.mu.Unlock()
// Remove from memory
delete(rp.replicas, id)
rp.dirty = true
// Remove file
filename := filepath.Join(rp.dataDir, "replica_"+id+".json")
err := os.Remove(filename)
// Ignore file not found errors
if err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
// GetAllReplicas returns all persisted replicas
func (rp *ReplicaPersistence) GetAllReplicas() (map[string]*ReplicaInfo, map[string]*ReplicaCredentials, error) {
if !rp.enabled {
return nil, nil, ErrPersistenceDisabled
}
rp.mu.RLock()
defer rp.mu.RUnlock()
infoMap := make(map[string]*ReplicaInfo, len(rp.replicas))
credsMap := make(map[string]*ReplicaCredentials, len(rp.replicas))
for id, pinfo := range rp.replicas {
infoMap[id] = rp.ToReplicaInfo(pinfo)
credsMap[id] = pinfo.Credentials
}
return infoMap, credsMap, nil
}
// Close shuts down the persistence manager
func (rp *ReplicaPersistence) Close() error {
if !rp.enabled {
return nil
}
// Stop auto-save timer
if rp.autoSave && rp.saveTimer != nil {
rp.saveTimer.Stop()
}
// Save any pending changes
return rp.Save()
}

34
pkg/transport/replication.go
View File

@ -10,11 +10,11 @@ import (
// Standard constants for replication message types // Standard constants for replication message types
const ( const (
// Request types // Request types
TypeReplicaRegister = "replica_register" TypeReplicaRegister = "replica_register"
TypeReplicaHeartbeat = "replica_heartbeat" TypeReplicaHeartbeat = "replica_heartbeat"
TypeReplicaWALSync = "replica_wal_sync" TypeReplicaWALSync = "replica_wal_sync"
TypeReplicaBootstrap = "replica_bootstrap" TypeReplicaBootstrap = "replica_bootstrap"
TypeReplicaStatus = "replica_status" TypeReplicaStatus = "replica_status"
// Response types // Response types
TypeReplicaACK = "replica_ack" TypeReplicaACK = "replica_ack"
@ -38,24 +38,24 @@ type ReplicaStatus string
// Replica statuses // Replica statuses
const ( const (
StatusConnecting ReplicaStatus = "connecting" StatusConnecting ReplicaStatus = "connecting"
StatusSyncing ReplicaStatus = "syncing" StatusSyncing ReplicaStatus = "syncing"
StatusBootstrapping ReplicaStatus = "bootstrapping" StatusBootstrapping ReplicaStatus = "bootstrapping"
StatusReady ReplicaStatus = "ready" StatusReady ReplicaStatus = "ready"
StatusDisconnected ReplicaStatus = "disconnected" StatusDisconnected ReplicaStatus = "disconnected"
StatusError ReplicaStatus = "error" StatusError ReplicaStatus = "error"
) )
// ReplicaInfo contains information about a replica // ReplicaInfo contains information about a replica
type ReplicaInfo struct { type ReplicaInfo struct {
ID string ID string
Address string Address string
Role ReplicaRole Role ReplicaRole
Status ReplicaStatus Status ReplicaStatus
LastSeen time.Time LastSeen time.Time
CurrentLSN uint64 // Lamport Sequence Number CurrentLSN uint64 // Lamport Sequence Number
ReplicationLag time.Duration ReplicationLag time.Duration
Error error Error error
} }
// ReplicationStreamDirection defines the direction of a replication stream // ReplicationStreamDirection defines the direction of a replication stream

354
pkg/transport/replication_metrics.go
View File

@ -1,354 +0,0 @@
package transport
import (
"sync"
"time"
)
// ReplicaMetrics contains metrics for a single replica
type ReplicaMetrics struct {
ReplicaID string // ID of the replica
Status ReplicaStatus // Current status
ConnectedDuration time.Duration // How long the replica has been connected
LastSeen time.Time // Last time a heartbeat was received
ReplicationLag time.Duration // Current replication lag
AppliedLSN uint64 // Last LSN applied on the replica
WALEntriesSent uint64 // Number of WAL entries sent to this replica
HeartbeatCount uint64 // Number of heartbeats received
ErrorCount uint64 // Number of errors encountered
// For bandwidth metrics
BytesSent uint64 // Total bytes sent to this replica
BytesReceived uint64 // Total bytes received from this replica
LastTransferRate uint64 // Bytes/second in the last measurement period
// Bootstrap metrics
BootstrapCount uint64 // Number of times bootstrapped
LastBootstrapTime time.Time // Last time a bootstrap was completed
LastBootstrapDuration time.Duration // Duration of the last bootstrap
}
// NewReplicaMetrics creates a new metrics collector for a replica
func NewReplicaMetrics(replicaID string) *ReplicaMetrics {
return &ReplicaMetrics{
ReplicaID: replicaID,
Status: StatusDisconnected,
LastSeen: time.Now(),
}
}
// ReplicationMetrics collects and provides metrics about replication
type ReplicationMetrics struct {
mu sync.RWMutex
replicaMetrics map[string]*ReplicaMetrics // Metrics by replica ID
// Overall replication metrics
PrimaryLSN uint64 // Current LSN on primary
TotalWALEntriesSent uint64 // Total WAL entries sent to all replicas
TotalBytesTransferred uint64 // Total bytes transferred
ActiveReplicaCount int // Number of currently active replicas
TotalErrorCount uint64 // Total error count across all replicas
TotalHeartbeatCount uint64 // Total heartbeats processed
AverageReplicationLag time.Duration // Average lag across replicas
MaxReplicationLag time.Duration // Maximum lag across replicas
// For performance tracking
processingTime map[string]time.Duration // Processing time by operation type
processingCount map[string]uint64 // Operation counts
lastSampleTime time.Time // Last time metrics were sampled
// Bootstrap metrics
bootstrapMetrics *BootstrapMetrics
}
// NewReplicationMetrics creates a new metrics collector
func NewReplicationMetrics() *ReplicationMetrics {
return &ReplicationMetrics{
replicaMetrics: make(map[string]*ReplicaMetrics),
processingTime: make(map[string]time.Duration),
processingCount: make(map[string]uint64),
lastSampleTime: time.Now(),
bootstrapMetrics: newBootstrapMetrics(),
}
}
// GetOrCreateReplicaMetrics gets metrics for a replica, creating if needed
func (rm *ReplicationMetrics) GetOrCreateReplicaMetrics(replicaID string) *ReplicaMetrics {
rm.mu.RLock()
metrics, exists := rm.replicaMetrics[replicaID]
rm.mu.RUnlock()
if exists {
return metrics
}
// Create new metrics
metrics = NewReplicaMetrics(replicaID)
rm.mu.Lock()
rm.replicaMetrics[replicaID] = metrics
rm.mu.Unlock()
return metrics
}
// UpdateReplicaStatus updates a replica's status and metrics
func (rm *ReplicationMetrics) UpdateReplicaStatus(replicaID string, status ReplicaStatus, lsn uint64) {
rm.mu.Lock()
defer rm.mu.Unlock()
metrics, exists := rm.replicaMetrics[replicaID]
if !exists {
metrics = NewReplicaMetrics(replicaID)
rm.replicaMetrics[replicaID] = metrics
}
// Update last seen
now := time.Now()
metrics.LastSeen = now
// Update status
oldStatus := metrics.Status
metrics.Status = status
// If just connected, start tracking connected duration
if oldStatus != StatusReady && status == StatusReady {
metrics.ConnectedDuration = 0
}
// Update LSN and calculate lag
if lsn > 0 {
metrics.AppliedLSN = lsn
// Calculate lag (primary LSN - replica LSN)
if rm.PrimaryLSN > lsn {
lag := rm.PrimaryLSN - lsn
// Convert to a time.Duration (assuming LSN ~ timestamp)
metrics.ReplicationLag = time.Duration(lag) * time.Millisecond
} else {
metrics.ReplicationLag = 0
}
}
// Increment heartbeat count
metrics.HeartbeatCount++
rm.TotalHeartbeatCount++
// Count active replicas and update aggregate metrics
rm.updateAggregateMetrics()
}
// RecordWALEntries records WAL entries sent to a replica
func (rm *ReplicationMetrics) RecordWALEntries(replicaID string, count uint64, bytes uint64) {
rm.mu.Lock()
defer rm.mu.Unlock()
metrics, exists := rm.replicaMetrics[replicaID]
if !exists {
metrics = NewReplicaMetrics(replicaID)
rm.replicaMetrics[replicaID] = metrics
}
// Update WAL entries count
metrics.WALEntriesSent += count
rm.TotalWALEntriesSent += count
// Update bytes transferred
metrics.BytesSent += bytes
rm.TotalBytesTransferred += bytes
// Calculate transfer rate
now := time.Now()
elapsed := now.Sub(rm.lastSampleTime)
if elapsed > time.Second {
metrics.LastTransferRate = uint64(float64(bytes) / elapsed.Seconds())
rm.lastSampleTime = now
}
}
// RecordBootstrap records a bootstrap operation
func (rm *ReplicationMetrics) RecordBootstrap(replicaID string, duration time.Duration) {
rm.mu.Lock()
defer rm.mu.Unlock()
metrics, exists := rm.replicaMetrics[replicaID]
if !exists {
metrics = NewReplicaMetrics(replicaID)
rm.replicaMetrics[replicaID] = metrics
}
metrics.BootstrapCount++
metrics.LastBootstrapTime = time.Now()
metrics.LastBootstrapDuration = duration
}
// RecordError records an error for a replica
func (rm *ReplicationMetrics) RecordError(replicaID string) {
rm.mu.Lock()
defer rm.mu.Unlock()
metrics, exists := rm.replicaMetrics[replicaID]
if !exists {
metrics = NewReplicaMetrics(replicaID)
rm.replicaMetrics[replicaID] = metrics
}
metrics.ErrorCount++
rm.TotalErrorCount++
}
// RecordOperationDuration records the duration of a replication operation
func (rm *ReplicationMetrics) RecordOperationDuration(operation string, duration time.Duration) {
rm.mu.Lock()
defer rm.mu.Unlock()
rm.processingTime[operation] += duration
rm.processingCount[operation]++
}
// GetAverageOperationDuration returns the average duration for an operation
func (rm *ReplicationMetrics) GetAverageOperationDuration(operation string) time.Duration {
rm.mu.RLock()
defer rm.mu.RUnlock()
count := rm.processingCount[operation]
if count == 0 {
return 0
}
return time.Duration(int64(rm.processingTime[operation]) / int64(count))
}
// GetAllReplicaMetrics returns a copy of all replica metrics
func (rm *ReplicationMetrics) GetAllReplicaMetrics() map[string]ReplicaMetrics {
rm.mu.RLock()
defer rm.mu.RUnlock()
result := make(map[string]ReplicaMetrics, len(rm.replicaMetrics))
for id, metrics := range rm.replicaMetrics {
result[id] = *metrics // Make a copy
}
return result
}
// GetReplicaMetrics returns metrics for a specific replica
func (rm *ReplicationMetrics) GetReplicaMetrics(replicaID string) (ReplicaMetrics, bool) {
rm.mu.RLock()
defer rm.mu.RUnlock()
metrics, exists := rm.replicaMetrics[replicaID]
if !exists {
return ReplicaMetrics{}, false
}
return *metrics, true
}
// GetSummaryMetrics returns summary metrics for all replicas
func (rm *ReplicationMetrics) GetSummaryMetrics() map[string]interface{} {
rm.mu.RLock()
defer rm.mu.RUnlock()
return map[string]interface{}{
"primary_lsn": rm.PrimaryLSN,
"active_replicas": rm.ActiveReplicaCount,
"total_wal_entries_sent": rm.TotalWALEntriesSent,
"total_bytes_transferred": rm.TotalBytesTransferred,
"avg_replication_lag_ms": rm.AverageReplicationLag.Milliseconds(),
"max_replication_lag_ms": rm.MaxReplicationLag.Milliseconds(),
"total_errors": rm.TotalErrorCount,
"total_heartbeats": rm.TotalHeartbeatCount,
}
}
// UpdatePrimaryLSN updates the current primary LSN
func (rm *ReplicationMetrics) UpdatePrimaryLSN(lsn uint64) {
rm.mu.Lock()
defer rm.mu.Unlock()
rm.PrimaryLSN = lsn
// Update lag for all replicas based on new primary LSN
for _, metrics := range rm.replicaMetrics {
if rm.PrimaryLSN > metrics.AppliedLSN {
lag := rm.PrimaryLSN - metrics.AppliedLSN
metrics.ReplicationLag = time.Duration(lag) * time.Millisecond
} else {
metrics.ReplicationLag = 0
}
}
// Update aggregate metrics
rm.updateAggregateMetrics()
}
// updateAggregateMetrics updates aggregate metrics based on all replicas
func (rm *ReplicationMetrics) updateAggregateMetrics() {
// Count active replicas
activeCount := 0
var totalLag time.Duration
maxLag := time.Duration(0)
for _, metrics := range rm.replicaMetrics {
if metrics.Status == StatusReady {
activeCount++
totalLag += metrics.ReplicationLag
if metrics.ReplicationLag > maxLag {
maxLag = metrics.ReplicationLag
}
}
}
rm.ActiveReplicaCount = activeCount
// Calculate average lag
if activeCount > 0 {
rm.AverageReplicationLag = totalLag / time.Duration(activeCount)
} else {
rm.AverageReplicationLag = 0
}
rm.MaxReplicationLag = maxLag
}
// UpdateConnectedDurations updates connected durations for all replicas
func (rm *ReplicationMetrics) UpdateConnectedDurations() {
rm.mu.Lock()
defer rm.mu.Unlock()
now := time.Now()
for _, metrics := range rm.replicaMetrics {
if metrics.Status == StatusReady {
metrics.ConnectedDuration = now.Sub(metrics.LastSeen) + metrics.ConnectedDuration
}
}
}
// IncrementBootstrapCount increments the bootstrap count for a replica
func (rm *ReplicationMetrics) IncrementBootstrapCount(replicaID string) {
rm.mu.Lock()
defer rm.mu.Unlock()
// Update per-replica metrics
metrics, exists := rm.replicaMetrics[replicaID]
if !exists {
metrics = NewReplicaMetrics(replicaID)
rm.replicaMetrics[replicaID] = metrics
}
metrics.BootstrapCount++
// Also update dedicated bootstrap metrics if available
if rm.bootstrapMetrics != nil {
rm.bootstrapMetrics.IncrementBootstrapCount(replicaID)
}
}
// UpdateBootstrapProgress updates the bootstrap progress for a replica
func (rm *ReplicationMetrics) UpdateBootstrapProgress(replicaID string, progress float64) {
if rm.bootstrapMetrics != nil {
rm.bootstrapMetrics.UpdateBootstrapProgress(replicaID, progress)
}
}

28
pkg/transport/replication_test.go
View File

@ -10,7 +10,7 @@ import (
// MockReplicationClient implements ReplicationClient for testing // MockReplicationClient implements ReplicationClient for testing
type MockReplicationClient struct { type MockReplicationClient struct {
connected bool connected bool
registeredAsReplica bool registeredAsReplica bool
heartbeatSent bool heartbeatSent bool
walEntriesRequested bool walEntriesRequested bool
@ -23,7 +23,7 @@ type MockReplicationClient struct {
func NewMockReplicationClient() *MockReplicationClient { func NewMockReplicationClient() *MockReplicationClient {
return &MockReplicationClient{ return &MockReplicationClient{
connected: false, connected: false,
registeredAsReplica: false, registeredAsReplica: false,
heartbeatSent: false, heartbeatSent: false,
walEntriesRequested: false, walEntriesRequested: false,
@ -169,12 +169,12 @@ func TestReplicationClientInterface(t *testing.T) {
// Test SendHeartbeat // Test SendHeartbeat
replicaInfo := &ReplicaInfo{ replicaInfo := &ReplicaInfo{
ID: "replica1", ID: "replica1",
Address: "localhost:50051", Address: "localhost:50051",
Role: RoleReplica, Role: RoleReplica,
Status: StatusReady, Status: StatusReady,
LastSeen: time.Now(), LastSeen: time.Now(),
CurrentLSN: 100, CurrentLSN: 100,
ReplicationLag: 0, ReplicationLag: 0,
} }
err = client.SendHeartbeat(ctx, replicaInfo) err = client.SendHeartbeat(ctx, replicaInfo)
@ -340,12 +340,12 @@ func TestReplicationServerInterface(t *testing.T) {
// Test RegisterReplica // Test RegisterReplica
replica1 := &ReplicaInfo{ replica1 := &ReplicaInfo{
ID: "replica1", ID: "replica1",
Address: "localhost:50051", Address: "localhost:50051",
Role: RoleReplica, Role: RoleReplica,
Status: StatusConnecting, Status: StatusConnecting,
LastSeen: time.Now(), LastSeen: time.Now(),
CurrentLSN: 0, CurrentLSN: 0,
ReplicationLag: 0, ReplicationLag: 0,
} }
err = server.RegisterReplica(replica1) err = server.RegisterReplica(replica1)

209
pkg/transport/retry.go
View File

@ -1,209 +0,0 @@
package transport
import (
"context"
"math"
"math/rand"
"time"
)
// RetryableFunc is a function that can be retried
type RetryableFunc func(ctx context.Context) error
// WithRetry executes a function with retry logic based on the provided policy
func WithRetry(ctx context.Context, policy RetryPolicy, fn RetryableFunc) error {
var err error
backoff := policy.InitialBackoff
for attempt := 0; attempt <= policy.MaxRetries; attempt++ {
// Execute the function
err = fn(ctx)
if err == nil {
// Success
return nil
}
// Check if we should continue retrying
if attempt == policy.MaxRetries {
break
}
// Check if context is done
select {
case <-ctx.Done():
return ctx.Err()
default:
// Continue
}
// Add jitter to prevent thundering herd
jitter := 1.0
if policy.Jitter > 0 {
jitter = 1.0 + rand.Float64()*policy.Jitter
}
// Calculate next backoff with jitter
backoffWithJitter := time.Duration(float64(backoff) * jitter)
if backoffWithJitter > policy.MaxBackoff {
backoffWithJitter = policy.MaxBackoff
}
// Wait for backoff period
timer := time.NewTimer(backoffWithJitter)
select {
case <-ctx.Done():
timer.Stop()
return ctx.Err()
case <-timer.C:
// Continue with next attempt
}
// Increase backoff for next attempt
backoff = time.Duration(float64(backoff) * policy.BackoffFactor)
if backoff > policy.MaxBackoff {
backoff = policy.MaxBackoff
}
}
return err
}
// DefaultRetryPolicy returns a sensible default retry policy
func DefaultRetryPolicy() RetryPolicy {
return RetryPolicy{
MaxRetries: 3,
InitialBackoff: 100 * time.Millisecond,
MaxBackoff: 5 * time.Second,
BackoffFactor: 2.0,
Jitter: 0.2,
}
}
// CircuitBreakerState represents the state of a circuit breaker
type CircuitBreakerState int
const (
// CircuitClosed means the circuit is closed and operations are permitted
CircuitClosed CircuitBreakerState = iota
// CircuitOpen means the circuit is open and operations will fail fast
CircuitOpen
// CircuitHalfOpen means the circuit is allowing a test operation
CircuitHalfOpen
)
// CircuitBreaker implements the circuit breaker pattern
type CircuitBreaker struct {
state CircuitBreakerState
failureThreshold int
resetTimeout time.Duration
failureCount int
lastFailure time.Time
lastStateChange time.Time
successThreshold int
halfOpenSuccesses int
}
// NewCircuitBreaker creates a new circuit breaker
func NewCircuitBreaker(failureThreshold int, resetTimeout time.Duration) *CircuitBreaker {
return &CircuitBreaker{
state: CircuitClosed,
failureThreshold: failureThreshold,
resetTimeout: resetTimeout,
successThreshold: 1, // Default to 1 success required to close circuit
}
}
// Execute attempts to execute a function with circuit breaker protection
func (cb *CircuitBreaker) Execute(ctx context.Context, fn RetryableFunc) error {
// Check if circuit is open
if cb.IsOpen() && !cb.shouldAttemptReset() {
return ErrCircuitOpen
}
// Mark as half-open if we're attempting a reset
if cb.state == CircuitOpen {
cb.state = CircuitHalfOpen
cb.halfOpenSuccesses = 0
cb.lastStateChange = time.Now()
}
// Execute the function
err := fn(ctx)
// Handle result
if err != nil {
// Record failure
cb.recordFailure()
return err
}
// Record success
cb.recordSuccess()
return nil
}
// IsOpen returns whether the circuit is open
func (cb *CircuitBreaker) IsOpen() bool {
return cb.state == CircuitOpen || cb.state == CircuitHalfOpen
}
// Trip manually opens the circuit
func (cb *CircuitBreaker) Trip() {
cb.state = CircuitOpen
cb.lastStateChange = time.Now()
}
// Reset manually closes the circuit
func (cb *CircuitBreaker) Reset() {
cb.state = CircuitClosed
cb.failureCount = 0
cb.lastStateChange = time.Now()
}
// recordFailure records a failure and potentially opens the circuit
func (cb *CircuitBreaker) recordFailure() {
cb.lastFailure = time.Now()
switch cb.state {
case CircuitClosed:
cb.failureCount++
if cb.failureCount >= cb.failureThreshold {
cb.state = CircuitOpen
cb.lastStateChange = time.Now()
}
case CircuitHalfOpen:
cb.state = CircuitOpen
cb.lastStateChange = time.Now()
}
}
// recordSuccess records a success and potentially closes the circuit
func (cb *CircuitBreaker) recordSuccess() {
switch cb.state {
case CircuitHalfOpen:
cb.halfOpenSuccesses++
if cb.halfOpenSuccesses >= cb.successThreshold {
cb.state = CircuitClosed
cb.failureCount = 0
cb.lastStateChange = time.Now()
}
case CircuitClosed:
// Reset failure count after a success
cb.failureCount = 0
}
}
// shouldAttemptReset determines if enough time has passed to attempt a reset
func (cb *CircuitBreaker) shouldAttemptReset() bool {
return cb.state == CircuitOpen &&
time.Since(cb.lastStateChange) >= cb.resetTimeout
}
// ExponentialBackoff calculates the next backoff duration
func ExponentialBackoff(attempt int, initialBackoff time.Duration, maxBackoff time.Duration, factor float64) time.Duration {
backoff := float64(initialBackoff) * math.Pow(factor, float64(attempt))
if backoff > float64(maxBackoff) {
return maxBackoff
}
return time.Duration(backoff)
}

208
pkg/transport/retry_test.go
View File

@ -1,208 +0,0 @@
package transport
import (
"context"
"errors"
"testing"
"time"
)
func TestWithRetrySuccess(t *testing.T) {
callCount := 0
successOnAttempt := 3
fn := func(ctx context.Context) error {
callCount++
if callCount >= successOnAttempt {
return nil
}
return errors.New("temporary error")
}
policy := RetryPolicy{
MaxRetries: 5,
InitialBackoff: 1 * time.Millisecond,
MaxBackoff: 10 * time.Millisecond,
BackoffFactor: 2.0,
Jitter: 0.1,
}
err := WithRetry(context.Background(), policy, fn)
if err != nil {
t.Errorf("Expected success, got error: %v", err)
}
if callCount != successOnAttempt {
t.Errorf("Expected %d calls, got %d", successOnAttempt, callCount)
}
}
func TestWithRetryExceedMaxRetries(t *testing.T) {
callCount := 0
fn := func(ctx context.Context) error {
callCount++
return errors.New("persistent error")
}
policy := RetryPolicy{
MaxRetries: 3,
InitialBackoff: 1 * time.Millisecond,
MaxBackoff: 10 * time.Millisecond,
BackoffFactor: 2.0,
Jitter: 0.0, // Disable jitter for deterministic tests
}
err := WithRetry(context.Background(), policy, fn)
if err == nil {
t.Error("Expected error, got nil")
}
expectedCalls := policy.MaxRetries + 1 // Initial try + retries
if callCount != expectedCalls {
t.Errorf("Expected %d calls, got %d", expectedCalls, callCount)
}
}
func TestWithRetryContextCancellation(t *testing.T) {
callCount := 0
fn := func(ctx context.Context) error {
callCount++
return errors.New("error")
}
policy := RetryPolicy{
MaxRetries: 10,
InitialBackoff: 50 * time.Millisecond,
MaxBackoff: 1 * time.Second,
BackoffFactor: 2.0,
Jitter: 0.0,
}
ctx, cancel := context.WithCancel(context.Background())
// Cancel the context after a short time
go func() {
time.Sleep(10 * time.Millisecond)
cancel()
}()
err := WithRetry(ctx, policy, fn)
if err == nil {
t.Error("Expected context cancellation error, got nil")
}
if !errors.Is(err, context.Canceled) {
t.Errorf("Expected context.Canceled error, got: %v", err)
}
}
func TestExponentialBackoff(t *testing.T) {
initialBackoff := 100 * time.Millisecond
maxBackoff := 10 * time.Second
factor := 2.0
tests := []struct {
name string
attempt int
expected time.Duration
}{
{"FirstAttempt", 0, 100 * time.Millisecond},
{"SecondAttempt", 1, 200 * time.Millisecond},
{"ThirdAttempt", 2, 400 * time.Millisecond},
{"FourthAttempt", 3, 800 * time.Millisecond},
{"MaxBackoff", 10, maxBackoff}, // This would exceed maxBackoff
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
result := ExponentialBackoff(tt.attempt, initialBackoff, maxBackoff, factor)
if result != tt.expected {
t.Errorf("Expected %v, got %v", tt.expected, result)
}
})
}
}
func TestCircuitBreaker(t *testing.T) {
t.Run("Initially Closed", func(t *testing.T) {
cb := NewCircuitBreaker(3, 100*time.Millisecond)
if cb.IsOpen() {
t.Error("Circuit breaker should be closed initially")
}
})
t.Run("Opens After Failures", func(t *testing.T) {
cb := NewCircuitBreaker(3, 100*time.Millisecond)
failingFn := func(ctx context.Context) error {
return errors.New("error")
}
// Execute with failures
for i := 0; i < 3; i++ {
_ = cb.Execute(context.Background(), failingFn)
}
if !cb.IsOpen() {
t.Error("Circuit breaker should be open after threshold failures")
}
})
t.Run("Stays Open Until Timeout", func(t *testing.T) {
resetTimeout := 100 * time.Millisecond
cb := NewCircuitBreaker(1, resetTimeout)
// Trip the circuit
cb.Trip()
if !cb.IsOpen() {
t.Error("Circuit breaker should be open after tripping")
}
// Execute should fail fast
err := cb.Execute(context.Background(), func(ctx context.Context) error {
return nil
})
if err != ErrCircuitOpen {
t.Errorf("Expected ErrCircuitOpen, got: %v", err)
}
// Wait for reset timeout
time.Sleep(resetTimeout + 10*time.Millisecond)
// Now it should be half-open and attempt the function
successFn := func(ctx context.Context) error {
return nil
}
err = cb.Execute(context.Background(), successFn)
if err != nil {
t.Errorf("Expected successful execution, got: %v", err)
}
if cb.IsOpen() {
t.Error("Circuit breaker should be closed after successful execution in half-open state")
}
})
t.Run("Resets After Success", func(t *testing.T) {
cb := NewCircuitBreaker(3, 100*time.Millisecond)
// Trip the circuit manually
cb.Trip()
// Manually reset
cb.Reset()
if cb.IsOpen() {
t.Error("Circuit breaker should be closed after reset")
}
})
}

4
pkg/wal/wal_test.go
View File

@ -377,8 +377,8 @@ func TestWALSyncModes(t *testing.T) {
syncMode config.SyncMode syncMode config.SyncMode
expectedEntries int // Expected number of entries after crash (without explicit sync) expectedEntries int // Expected number of entries after crash (without explicit sync)
}{ }{
{"SyncNone", config.SyncNone, 0}, // No entries should be recovered without explicit sync {"SyncNone", config.SyncNone, 0}, // No entries should be recovered without explicit sync
{"SyncBatch", config.SyncBatch, 0}, // No entries should be recovered if batch threshold not reached {"SyncBatch", config.SyncBatch, 0}, // No entries should be recovered if batch threshold not reached
{"SyncImmediate", config.SyncImmediate, 10}, // All entries should be recovered {"SyncImmediate", config.SyncImmediate, 10}, // All entries should be recovered
} }