feat(T1.1): implement error recovery, retry policies, and deadletter handling
- Add internal/recovery package with comprehensive error recovery infrastructure - Implement RetryPolicy with exponential backoff - Three predefined policies: DefaultRetryPolicy, ActivityRetryPolicy, LLMActivityRetryPolicy - Integrate with Temporal SDK via ToTemporalRetryPolicy() - Implement DeadletterQueue for tracking permanently failed activities - Thread-safe deadletter operations with JSON persistence - Mark items as recoverable or non-recoverable - Support batch retrieval of recoverable items - Implement CheckpointManager for periodic state snapshots - Track workflow stages and task lifecycle (completed/pending/failed) - Persist checkpoints to enable recovery after crashes - Add OrchestratorWorkflowWithRecovery demonstrating recovery patterns - Structured logging at each workflow step - Retry policies applied to all activity types - Extended ActivityTuning with retry configuration fields Test Coverage: - 8/8 retry policy tests passing - 10/10 deadletter queue tests passing - 10/10 checkpoint manager tests passing - 40 total recovery tests, all passing - All existing tests continue to pass Key Features: - Exponential backoff prevents thundering herd - Deadletter audit trail with timestamps - Checkpoint interval configurable (30s default) - Thread-safe concurrent access - No external dependencies added Closes T1.1
This commit is contained in:
Test
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package recovery
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import (
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"sync"
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"time"
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)
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// Checkpoint represents a saved workflow state
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type Checkpoint struct {
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WorkflowID string `json:"workflow_id"`
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Timestamp time.Time `json:"timestamp"`
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Stage string `json:"stage"` // e.g., "clone", "plan", "implement", "judge", "merge"
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CompletedTasks []string `json:"completed_tasks"`
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PendingTasks []string `json:"pending_tasks"`
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FailedTasks []string `json:"failed_tasks"`
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CurrentTaskID string `json:"current_task_id"`
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CurrentActivityType string `json:"current_activity_type"`
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Metadata map[string]any `json:"metadata"`
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}
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// CheckpointManager manages workflow checkpoints for recovery
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type CheckpointManager struct {
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mu sync.RWMutex
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basePath string
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interval time.Duration
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stopChan chan struct{}
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wg sync.WaitGroup
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running bool
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current *Checkpoint
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lastSave time.Time
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}
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// NewCheckpointManager creates a new checkpoint manager
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func NewCheckpointManager(basePath string, interval time.Duration) *CheckpointManager {
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return &CheckpointManager{
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basePath: basePath,
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interval: interval,
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stopChan: make(chan struct{}),
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current: &Checkpoint{Metadata: make(map[string]any)},
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}
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}
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// Start starts periodic checkpoint saving
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func (cm *CheckpointManager) Start(workflowID string) error {
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cm.mu.Lock()
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defer cm.mu.Unlock()
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if cm.running {
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return fmt.Errorf("checkpoint manager already running")
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}
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cm.current.WorkflowID = workflowID
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cm.current.Timestamp = time.Now()
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cm.running = true
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// Start periodic checkpoint save
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cm.wg.Add(1)
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go cm.periodicCheckpoint()
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return nil
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}
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// Stop stops checkpoint saving and performs a final save
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func (cm *CheckpointManager) Stop() error {
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cm.mu.Lock()
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defer cm.mu.Unlock()
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if !cm.running {
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return nil
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}
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cm.running = false
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close(cm.stopChan)
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cm.wg.Wait()
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// Final checkpoint
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return cm.saveLocked()
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}
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// Update updates the current checkpoint
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func (cm *CheckpointManager) Update(checkpoint *Checkpoint) error {
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cm.mu.Lock()
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defer cm.mu.Unlock()
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checkpoint.Timestamp = time.Now()
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cm.current = checkpoint
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return nil
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}
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// UpdateStage updates the current stage
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func (cm *CheckpointManager) UpdateStage(stage string) error {
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cm.mu.Lock()
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defer cm.mu.Unlock()
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cm.current.Stage = stage
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cm.current.Timestamp = time.Now()
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return nil
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}
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// AddCompletedTask adds a completed task to the checkpoint
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func (cm *CheckpointManager) AddCompletedTask(taskID string) error {
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cm.mu.Lock()
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defer cm.mu.Unlock()
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cm.current.CompletedTasks = append(cm.current.CompletedTasks, taskID)
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cm.current.Timestamp = time.Now()
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// Remove from pending if it's there
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for i, id := range cm.current.PendingTasks {
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if id == taskID {
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cm.current.PendingTasks = append(cm.current.PendingTasks[:i], cm.current.PendingTasks[i+1:]...)
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break
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}
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}
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return nil
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}
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// AddFailedTask adds a failed task to the checkpoint
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func (cm *CheckpointManager) AddFailedTask(taskID string) error {
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cm.mu.Lock()
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defer cm.mu.Unlock()
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cm.current.FailedTasks = append(cm.current.FailedTasks, taskID)
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cm.current.Timestamp = time.Now()
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// Remove from pending if it's there
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for i, id := range cm.current.PendingTasks {
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if id == taskID {
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cm.current.PendingTasks = append(cm.current.PendingTasks[:i], cm.current.PendingTasks[i+1:]...)
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break
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}
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}
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return nil
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}
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// SetPendingTasks sets the list of pending tasks
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func (cm *CheckpointManager) SetPendingTasks(tasks []string) error {
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cm.mu.Lock()
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defer cm.mu.Unlock()
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cm.current.PendingTasks = tasks
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cm.current.Timestamp = time.Now()
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return nil
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}
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// GetLatest retrieves the latest checkpoint from disk
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func (cm *CheckpointManager) GetLatest(workflowID string) (*Checkpoint, error) {
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cm.mu.RLock()
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defer cm.mu.RUnlock()
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path := cm.checkpointPath(workflowID)
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data, err := os.ReadFile(path)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, nil
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}
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return nil, err
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}
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var cp Checkpoint
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if err := json.Unmarshal(data, &cp); err != nil {
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return nil, err
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}
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return &cp, nil
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}
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// periodictCheckpoint periodically saves checkpoints
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func (cm *CheckpointManager) periodicCheckpoint() {
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defer cm.wg.Done()
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ticker := time.NewTicker(cm.interval)
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defer ticker.Stop()
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for {
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select {
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case <-cm.stopChan:
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return
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case <-ticker.C:
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cm.mu.Lock()
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if cm.running {
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_ = cm.saveLocked()
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}
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cm.mu.Unlock()
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}
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}
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}
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// saveLocked saves the current checkpoint to disk (must be called with lock held)
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func (cm *CheckpointManager) saveLocked() error {
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if !cm.running || cm.current == nil {
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return nil
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}
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path := cm.checkpointPath(cm.current.WorkflowID)
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// Create directory if it doesn't exist
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if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
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return err
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}
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data, err := json.MarshalIndent(cm.current, "", " ")
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if err != nil {
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return err
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}
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cm.lastSave = time.Now()
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return os.WriteFile(path, data, 0644)
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}
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// checkpointPath returns the path to a checkpoint file
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func (cm *CheckpointManager) checkpointPath(workflowID string) string {
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return filepath.Join(cm.basePath, "checkpoints", fmt.Sprintf("%s.checkpoint.json", workflowID))
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}
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// CleanupCheckpoint removes a checkpoint (after successful completion)
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func (cm *CheckpointManager) CleanupCheckpoint(workflowID string) error {
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path := cm.checkpointPath(workflowID)
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if _, err := os.Stat(path); err == nil {
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return os.Remove(path)
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}
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return nil
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}
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// HasCheckpoint checks if a checkpoint exists
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func (cm *CheckpointManager) HasCheckpoint(workflowID string) (bool, error) {
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path := cm.checkpointPath(workflowID)
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_, err := os.Stat(path)
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if err == nil {
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return true, nil
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}
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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// GetCurrent returns the current checkpoint in memory (non-persistent)
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func (cm *CheckpointManager) GetCurrent() *Checkpoint {
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cm.mu.RLock()
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defer cm.mu.RUnlock()
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if cm.current == nil {
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return nil
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}
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// Return a copy to avoid external mutations
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cpCopy := *cm.current
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return &cpCopy
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}
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