feat(T2.1): implement activity result caching
- Add internal/cache package for deduplicating activity results - Implement ResultCache with MD5 hash-based cache keys - Support cache by activity type, task ID, input hash, model ID - Configurable max size with FIFO eviction policy - TTL support for automatic expiration - Persistence to JSON for recovery across runs - Query operations: by activity type, by task ID - Hit rate tracking and statistics - 13 cache tests, all passing Features: - ComputeHash() for input deduplication - Set/Get operations with TTL support - Invalidation by activity type or task ID - Cache stats with usage ratio - Full cache clear - Disk persistence with JSON storage - Hit rate calculation Performance: - Avoids redundant LLM calls - Reduces API costs - Faster workflow execution - Configurable eviction policies Test Coverage: - 13 cache tests (set/get, TTL, eviction, persistence) - Hit rate calculation verified - Invalidation tested - Multi-entry scenarios Next: T2.2 (Parallel task dispatch)
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Test
Vendored
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package cache
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import (
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"crypto/md5"
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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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// CacheKey represents a cache key for an activity result
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type CacheKey struct {
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ActivityType string // "implementer", "judge", "planner"
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TaskID string
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InputHash string // MD5 hash of input
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ModelID string // LLM model used
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}
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// String returns a string representation of the cache key
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func (ck *CacheKey) String() string {
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return fmt.Sprintf("%s:%s:%s:%s", ck.ActivityType, ck.TaskID, ck.InputHash, ck.ModelID)
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}
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// CacheEntry represents a cached activity result
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type CacheEntry struct {
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Key CacheKey `json:"key"`
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Result map[string]interface{} `json:"result"`
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CreatedAt time.Time `json:"created_at"`
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HitCount int `json:"hit_count"`
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Metadata map[string]interface{} `json:"metadata,omitempty"`
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}
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// ResultCache caches activity results to avoid redundant computations
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type ResultCache struct {
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mu sync.RWMutex
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basePath string
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cache map[string]*CacheEntry
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maxSize int
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ttl time.Duration
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}
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// NewResultCache creates a new result cache
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func NewResultCache(basePath string, maxSize int, ttl time.Duration) *ResultCache {
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return &ResultCache{
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basePath: basePath,
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cache: make(map[string]*CacheEntry),
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maxSize: maxSize,
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ttl: ttl,
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}
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}
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// ComputeHash computes a hash of the input data
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func ComputeHash(data interface{}) (string, error) {
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jsonData, err := json.Marshal(data)
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if err != nil {
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return "", err
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}
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hash := md5.Sum(jsonData)
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return fmt.Sprintf("%x", hash), nil
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}
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// Set stores a result in the cache
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func (rc *ResultCache) Set(key *CacheKey, result map[string]interface{}) error {
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if key == nil {
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return fmt.Errorf("cache key cannot be nil")
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}
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rc.mu.Lock()
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defer rc.mu.Unlock()
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keyStr := key.String()
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entry := &CacheEntry{
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Key: *key,
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Result: result,
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CreatedAt: time.Now(),
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Metadata: make(map[string]interface{}),
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}
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// Check size limit
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if len(rc.cache) >= rc.maxSize && rc.cache[keyStr] == nil {
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// Evict oldest entry (simple FIFO)
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var oldestKey string
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var oldestTime time.Time
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for k, v := range rc.cache {
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if oldestTime.IsZero() || v.CreatedAt.Before(oldestTime) {
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oldestKey = k
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oldestTime = v.CreatedAt
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}
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}
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if oldestKey != "" {
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delete(rc.cache, oldestKey)
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}
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}
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rc.cache[keyStr] = entry
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return rc.persistLocked(keyStr, entry)
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}
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// Get retrieves a result from the cache
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func (rc *ResultCache) Get(key *CacheKey) (map[string]interface{}, bool, error) {
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if key == nil {
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return nil, false, fmt.Errorf("cache key cannot be nil")
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}
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rc.mu.Lock()
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defer rc.mu.Unlock()
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keyStr := key.String()
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entry, exists := rc.cache[keyStr]
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if !exists {
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return nil, false, nil
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}
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// Check TTL
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if rc.ttl > 0 && time.Since(entry.CreatedAt) > rc.ttl {
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delete(rc.cache, keyStr)
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return nil, false, nil
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}
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// Increment hit count
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entry.HitCount++
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_ = rc.persistLocked(keyStr, entry)
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return entry.Result, true, nil
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}
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// Invalidate removes a cache entry
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func (rc *ResultCache) Invalidate(key *CacheKey) error {
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if key == nil {
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return fmt.Errorf("cache key cannot be nil")
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}
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rc.mu.Lock()
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defer rc.mu.Unlock()
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keyStr := key.String()
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delete(rc.cache, keyStr)
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// Delete from disk
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cacheFile := filepath.Join(rc.basePath, "cache", fmt.Sprintf("%s.json", keyStr))
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_ = os.Remove(cacheFile)
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return nil
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}
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// Clear clears all cache entries
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func (rc *ResultCache) Clear() error {
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rc.mu.Lock()
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defer rc.mu.Unlock()
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rc.cache = make(map[string]*CacheEntry)
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// Clear disk cache
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cacheDir := filepath.Join(rc.basePath, "cache")
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_ = os.RemoveAll(cacheDir)
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return nil
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}
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// GetStats returns cache statistics
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func (rc *ResultCache) GetStats() map[string]interface{} {
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rc.mu.RLock()
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defer rc.mu.RUnlock()
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totalHits := 0
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for _, entry := range rc.cache {
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totalHits += entry.HitCount
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}
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return map[string]interface{}{
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"size": len(rc.cache),
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"max_size": rc.maxSize,
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"total_hits": totalHits,
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"usage_ratio": float64(len(rc.cache)) / float64(rc.maxSize),
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}
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}
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// GetSize returns the current cache size
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func (rc *ResultCache) GetSize() int {
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rc.mu.RLock()
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defer rc.mu.RUnlock()
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return len(rc.cache)
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}
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// persistLocked saves a cache entry to disk (must be called with lock held)
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func (rc *ResultCache) persistLocked(keyStr string, entry *CacheEntry) error {
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cacheDir := filepath.Join(rc.basePath, "cache")
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// Create directory if it doesn't exist
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if err := os.MkdirAll(cacheDir, 0755); err != nil {
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return err
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}
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cacheFile := filepath.Join(cacheDir, fmt.Sprintf("%s.json", keyStr))
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data, err := json.MarshalIndent(entry, "", " ")
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if err != nil {
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return err
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}
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return os.WriteFile(cacheFile, data, 0644)
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}
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// Load loads cache from disk
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func (rc *ResultCache) Load() error {
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rc.mu.Lock()
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defer rc.mu.Unlock()
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cacheDir := filepath.Join(rc.basePath, "cache")
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entries, err := os.ReadDir(cacheDir)
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if err != nil {
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if os.IsNotExist(err) {
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return nil // Cache doesn't exist yet
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}
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return err
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}
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for _, entry := range entries {
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if entry.IsDir() {
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continue
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}
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filePath := filepath.Join(cacheDir, entry.Name())
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data, err := os.ReadFile(filePath)
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if err != nil {
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continue
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}
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var cacheEntry CacheEntry
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if err := json.Unmarshal(data, &cacheEntry); err != nil {
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continue
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}
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// Skip expired entries
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if rc.ttl > 0 && time.Since(cacheEntry.CreatedAt) > rc.ttl {
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continue
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}
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keyStr := cacheEntry.Key.String()
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rc.cache[keyStr] = &cacheEntry
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}
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return nil
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}
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// InvalidateByActivity invalidates all cache entries for an activity type
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func (rc *ResultCache) InvalidateByActivity(activityType string) error {
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rc.mu.Lock()
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defer rc.mu.Unlock()
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keysToDelete := make([]string, 0)
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for keyStr, entry := range rc.cache {
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if entry.Key.ActivityType == activityType {
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keysToDelete = append(keysToDelete, keyStr)
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}
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}
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for _, keyStr := range keysToDelete {
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delete(rc.cache, keyStr)
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// Delete from disk
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cacheFile := filepath.Join(rc.basePath, "cache", fmt.Sprintf("%s.json", keyStr))
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_ = os.Remove(cacheFile)
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}
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return nil
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}
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// InvalidateByTask invalidates all cache entries for a task
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func (rc *ResultCache) InvalidateByTask(taskID string) error {
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rc.mu.Lock()
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defer rc.mu.Unlock()
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keysToDelete := make([]string, 0)
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for keyStr, entry := range rc.cache {
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if entry.Key.TaskID == taskID {
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keysToDelete = append(keysToDelete, keyStr)
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}
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}
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for _, keyStr := range keysToDelete {
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delete(rc.cache, keyStr)
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// Delete from disk
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cacheFile := filepath.Join(rc.basePath, "cache", fmt.Sprintf("%s.json", keyStr))
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_ = os.Remove(cacheFile)
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}
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return nil
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}
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// GetHitRate returns the cache hit rate
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func (rc *ResultCache) GetHitRate() (float64, int) {
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rc.mu.RLock()
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defer rc.mu.RUnlock()
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if len(rc.cache) == 0 {
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return 0, 0
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}
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totalHits := 0
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for _, entry := range rc.cache {
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totalHits += entry.HitCount
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}
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if totalHits == 0 {
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return 0, len(rc.cache)
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}
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return float64(totalHits) / float64(len(rc.cache)), len(rc.cache)
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}
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