From 59dbb02b12f2db55b122dd7aec9ea16b9c041bdf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=D0=93=D1=80=D0=B8=D0=B3=D0=BE=D1=80=D0=B8=D0=B9=20=D0=A1?= =?UTF-8?q?=D0=B0=D1=84=D1=80=D0=BE=D0=BD=D0=BE=D0=B2?= Date: Thu, 17 Sep 2026 22:04:22 +0000 Subject: [PATCH] Delete internal/storage/transactions.go --- internal/storage/transactions.go | 4427 ------------------------------ 1 file changed, 4427 deletions(-) delete mode 100644 internal/storage/transactions.go diff --git a/internal/storage/transactions.go b/internal/storage/transactions.go deleted file mode 100644 index 5106f29..0000000 --- a/internal/storage/transactions.go +++ /dev/null @@ -1,4427 +0,0 @@ -/* - * Copyright 2026 Safronov Grigorii - * - * Licensed under the CDDL, Version 1.0 (the "License"); - * you may not use this file except in compliance with the License. - * - * You may obtain a copy of the License at - * https://opensource.org/licenses/CDDL-1.0 - */ - -// Файл: internal/storage/transactions.go -// Назначение: Реализация транзакций с поддержкой MVCC и WAL без блокировок. -// Для распределённых транзакций используется протокол SAGA. - -package storage - -import ( - "bufio" - "encoding/binary" - "encoding/json" - "fmt" - "io" - "os" - "path/filepath" - "sort" - "sync" - "sync/atomic" - "time" - - "futriis/internal/config" -) - -// ============================================================================= -// БАЗОВЫЕ ТИПЫ -// ============================================================================= - -// TransactionID - уникальный идентификатор транзакции. -type TransactionID uint64 - -// TransactionState - состояние транзакции. -type TransactionState int32 - -const ( - TransactionActive TransactionState = iota - TransactionCommitted - TransactionAborted - TransactionPrepared -) - -// TransactionRecord - запись транзакции в WAL. -type TransactionRecord struct { - ID TransactionID `json:"id"` - State TransactionState `json:"state"` - Timestamp int64 `json:"timestamp"` - Operations []Operation `json:"operations"` - IsDistributed bool `json:"is_distributed"` - Nodes []string `json:"nodes,omitempty"` -} - -// WALRecord - запись в WAL (Write-Ahead Log). -type WALRecord struct { - CRC uint32 `json:"crc"` - Length uint32 `json:"length"` - Type byte `json:"type"` - Data []byte `json:"data"` - Timestamp int64 `json:"timestamp"` - LSN uint64 `json:"lsn"` -} - -// ============================================================================= -// КОНСТАНТЫ -// ============================================================================= - -const ( - WALSegmentSize = 64 * 1024 * 1024 - WALSegmentPrefix = "wal_segment_" - WALIndexPrefix = "wal_index_" - - VersionPruneInterval = 5 * time.Minute - - DefaultTxTimeout = 30 * time.Second - DeadlockCheckInterval = 1 * time.Second - MaxSavepointsPerTx = 100 - - AsyncRecoveryBufferSize = 10000 - AsyncRecoveryWorkers = 4 - AsyncRecoveryTimeout = 30 * time.Second - FsyncMaxRetries = 3 - FsyncRetryDelay = 100 * time.Millisecond - - SagaStateDir = "saga_states" - SagaStateFilePrefix = "saga_state_" - SagaStateFileSuffix = ".json" - SagaCheckpointInterval = 30 * time.Second - SagaMaxRetries = 5 - SagaRetryBackoff = 100 * time.Millisecond - - // ИСПРАВЛЕНО: Константы для orphan-шагов SAGA - SagaOrphanTimeout = 5 * time.Minute - SagaCleanupInterval = 1 * time.Minute -) - -// ============================================================================= -// CRC32 - КОНТРОЛЬНАЯ СУММА -// ============================================================================= - -var crc32Table = [256]uint32{ - 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, - 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, - 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, - 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, - 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, - 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, - 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, - 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, - 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, - 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, - 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, - 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, - 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, - 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, - 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, - 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, - 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, - 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, - 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, - 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, - 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, - 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, - 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, - 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, - 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, - 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, - 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, - 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, - 0xd80d2bda, 0xaf0a1a4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, - 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, - 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, - 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, - 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, - 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, - 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, - 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, - 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, - 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, - 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, - 0x40df0b66, 0x37d83bf8, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, - 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, - 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, - 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, -} - -func crc32(data []byte) uint32 { - crc := uint32(0xFFFFFFFF) - for _, b := range data { - crc = (crc >> 8) ^ crc32Table[(crc^uint32(b))&0xFF] - } - return crc ^ 0xFFFFFFFF -} - -// ============================================================================= -// АУДИТ ТРАНЗАКЦИЙ -// ============================================================================= - -// TransactionAuditEntry представляет запись аудита транзакции -type TransactionAuditEntry struct { - TxID TransactionID `json:"tx_id"` - Action string `json:"action"` - State TransactionState `json:"state"` - Timestamp int64 `json:"timestamp"` - TimestampStr string `json:"timestamp_str"` - Details map[string]interface{} `json:"details"` -} - -// TransactionAuditLogger управляет аудитом транзакций -type TransactionAuditLogger struct { - entries []TransactionAuditEntry - mu sync.RWMutex - maxSize int - filePath string - fileMu sync.Mutex - enabled bool -} - -var globalTxAuditLogger = &TransactionAuditLogger{ - entries: make([]TransactionAuditEntry, 0), - maxSize: 100000, - enabled: true, -} - -// InitTransactionAuditLogger инициализирует аудит логгер с записью в файл -func InitTransactionAuditLogger(filePath string) error { - globalTxAuditLogger.filePath = filePath - if filePath != "" { - if err := os.MkdirAll(filepath.Dir(filePath), 0755); err != nil { - return err - } - globalTxAuditLogger.loadFromFile() - } - return nil -} - -func (tal *TransactionAuditLogger) loadFromFile() { - if tal.filePath == "" { - return - } - data, err := os.ReadFile(tal.filePath) - if err != nil { - return - } - var entries []TransactionAuditEntry - if err := json.Unmarshal(data, &entries); err != nil { - return - } - tal.mu.Lock() - defer tal.mu.Unlock() - tal.entries = entries -} - -func (tal *TransactionAuditLogger) saveToFile() { - if tal.filePath == "" { - return - } - tal.fileMu.Lock() - defer tal.fileMu.Unlock() - - tal.mu.RLock() - data, err := json.MarshalIndent(tal.entries, "", " ") - tal.mu.RUnlock() - - if err != nil { - return - } - os.WriteFile(tal.filePath, data, 0644) -} - -// LogTransactionAudit записывает событие аудита транзакции -func LogTransactionAudit(txID TransactionID, action string, state TransactionState, details map[string]interface{}) { - if !globalTxAuditLogger.enabled { - return - } - - now := time.Now() - entry := TransactionAuditEntry{ - TxID: txID, - Action: action, - State: state, - Timestamp: now.UnixMilli(), - TimestampStr: now.Format("2006-01-02 15:04:05.000"), - Details: details, - } - - globalTxAuditLogger.mu.Lock() - globalTxAuditLogger.entries = append(globalTxAuditLogger.entries, entry) - if len(globalTxAuditLogger.entries) > globalTxAuditLogger.maxSize { - globalTxAuditLogger.entries = globalTxAuditLogger.entries[len(globalTxAuditLogger.entries)-globalTxAuditLogger.maxSize:] - } - globalTxAuditLogger.mu.Unlock() - - go globalTxAuditLogger.saveToFile() -} - -// GetTransactionAuditLog возвращает лог аудита транзакций -func GetTransactionAuditLog() []TransactionAuditEntry { - globalTxAuditLogger.mu.RLock() - defer globalTxAuditLogger.mu.RUnlock() - result := make([]TransactionAuditEntry, len(globalTxAuditLogger.entries)) - copy(result, globalTxAuditLogger.entries) - return result -} - -// ============================================================================= -// MVCC - MULTI-VERSION CONCURRENCY CONTROL -// ИСПРАВЛЕНО: Утечка версий - добавлен учёт активных читателей -// ============================================================================= - -// MVCCManager - основной менеджер MVCC -type MVCCManager struct { - versions sync.Map // docID -> []*DocumentVersion - visibilityMap *VisibilityMap - readCache *ReadTimestampCache - maxVersionsPerDoc int - retentionDuration time.Duration - stats MVCCStats - mu sync.RWMutex - // ИСПРАВЛЕНО: Отслеживание активных читателей - activeReaders sync.Map // map[uint64]int64 - txID -> timestamp начала чтения - readersMu sync.RWMutex - oldestReadTx atomic.Int64 -} - -// MVCCStats статистика MVCC -type MVCCStats struct { - TotalVersionsCreated atomic.Uint64 - TotalVersionsPruned atomic.Uint64 - TotalCacheHits atomic.Uint64 - TotalCacheMisses atomic.Uint64 - TotalVisibilityHits atomic.Uint64 - TotalVisibilityMisses atomic.Uint64 - TotalSkippedPrune atomic.Uint64 -} - -// NewMVCCManager создаёт новый MVCC менеджер -func NewMVCCManager(maxVersionsPerDoc int, retentionDays int) *MVCCManager { - if maxVersionsPerDoc <= 0 { - maxVersionsPerDoc = MaxVersionsPerDoc - } - if retentionDays <= 0 { - retentionDays = VersionRetentionDays - } - - m := &MVCCManager{ - maxVersionsPerDoc: maxVersionsPerDoc, - retentionDuration: time.Duration(retentionDays) * 24 * time.Hour, - visibilityMap: NewVisibilityMap(VisibilityMapSize), - readCache: NewReadTimestampCache(10000, 5*time.Minute), - } - m.oldestReadTx.Store(0) - go m.pruneOldVersionsLoop() - return m -} - -// RegisterReader регистрирует активного читателя -func (m *MVCCManager) RegisterReader(txID uint64) { - m.readersMu.Lock() - defer m.readersMu.Unlock() - m.activeReaders.Store(txID, time.Now().UnixMilli()) - m.updateOldestReader() -} - -// UnregisterReader удаляет читателя из отслеживания -func (m *MVCCManager) UnregisterReader(txID uint64) { - m.readersMu.Lock() - defer m.readersMu.Unlock() - m.activeReaders.Delete(txID) - m.updateOldestReader() -} - -// updateOldestReader обновляет oldestReadTx (вызывать под readersMu) -func (m *MVCCManager) updateOldestReader() { - oldest := int64(^uint64(0) >> 1) - m.activeReaders.Range(func(key, value interface{}) bool { - if ts, ok := value.(int64); ok && ts < oldest { - oldest = ts - } - return true - }) - m.oldestReadTx.Store(oldest) -} - -// CreateVersion создаёт новую версию документа -func (m *MVCCManager) CreateVersion(doc *Document, txID TransactionID) *DocumentVersion { - version := &DocumentVersion{ - Document: doc.Clone(), - Timestamp: time.Now().UnixMilli(), - TxID: txID, - VersionID: fmt.Sprintf("%s_%d_%d", doc.ID, txID, time.Now().UnixNano()), - } - - m.mu.Lock() - defer m.mu.Unlock() - - val, _ := m.versions.LoadOrStore(doc.ID, make([]*DocumentVersion, 0)) - versions := val.([]*DocumentVersion) - versions = append(versions, version) - - // ИСПРАВЛЕНО: Учитываем активных читателей при удалении старых версий - if len(versions) > m.maxVersionsPerDoc { - oldestReader := m.oldestReadTx.Load() - newVersions := make([]*DocumentVersion, 0, m.maxVersionsPerDoc) - startIdx := len(versions) - m.maxVersionsPerDoc - if startIdx < 0 { - startIdx = 0 - } - for i := startIdx; i < len(versions); i++ { - newVersions = append(newVersions, versions[i]) - } - // Сохраняем версии, которые могут читать активные транзакции - if oldestReader > 0 { - for i := 0; i < startIdx; i++ { - if versions[i].Timestamp >= oldestReader { - newVersions = append([]*DocumentVersion{versions[i]}, newVersions...) - } - } - } - prunedCount := len(versions) - len(newVersions) - versions = newVersions - m.stats.TotalVersionsPruned.Add(uint64(prunedCount)) - } - - m.versions.Store(doc.ID, versions) - m.visibilityMap.MarkVisible(doc.ID, uint64(txID), true) - m.stats.TotalVersionsCreated.Add(1) - - LogTransactionAudit(txID, "VERSION_CREATE", TransactionActive, map[string]interface{}{ - "doc_id": doc.ID, - "version": version.VersionID, - }) - - return version -} - -// GetVersionAt возвращает версию документа на указанный момент времени -func (m *MVCCManager) GetVersionAt(docID string, timestamp int64) *Document { - if cached := m.readCache.Get(docID, timestamp); cached != nil { - m.stats.TotalCacheHits.Add(1) - return cached - } - m.stats.TotalCacheMisses.Add(1) - - m.mu.RLock() - defer m.mu.RUnlock() - - val, ok := m.versions.Load(docID) - if !ok { - return nil - } - versions := val.([]*DocumentVersion) - - var result *DocumentVersion - for i := len(versions) - 1; i >= 0; i-- { - v := versions[i] - if v.Timestamp <= timestamp && m.visibilityMap.IsVisible(docID, uint64(v.TxID)) { - result = v - break - } - } - if result == nil { - return nil - } - - doc := result.Document.Clone() - m.readCache.Set(docID, timestamp, doc) - return doc -} - -// GetLatestVersion возвращает последнюю версию документа -func (m *MVCCManager) GetLatestVersion(docID string) *Document { - m.mu.RLock() - defer m.mu.RUnlock() - - val, ok := m.versions.Load(docID) - if !ok { - return nil - } - versions := val.([]*DocumentVersion) - if len(versions) == 0 { - return nil - } - return versions[len(versions)-1].Document.Clone() -} - -// GetAllVersions возвращает все версии документа -func (m *MVCCManager) GetAllVersions(docID string) []*DocumentVersion { - m.mu.RLock() - defer m.mu.RUnlock() - - val, ok := m.versions.Load(docID) - if !ok { - return nil - } - versions := val.([]*DocumentVersion) - result := make([]*DocumentVersion, len(versions)) - for i, v := range versions { - result[i] = &DocumentVersion{ - Document: v.Document.Clone(), - Timestamp: v.Timestamp, - TxID: v.TxID, - VersionID: v.VersionID, - } - } - return result -} - -func (m *MVCCManager) pruneOldVersionsLoop() { - ticker := time.NewTicker(VersionPruneInterval) - defer ticker.Stop() - for range ticker.C { - m.PruneOldVersions() - } -} - -// PruneOldVersions удаляет старые версии документов -// ИСПРАВЛЕНО: Учитывает активных читателей -func (m *MVCCManager) PruneOldVersions() { - cutoffTime := time.Now().Add(-m.retentionDuration).UnixMilli() - oldestReader := m.oldestReadTx.Load() - pruned := int64(0) - skipped := int64(0) - - m.mu.Lock() - defer m.mu.Unlock() - - m.versions.Range(func(key, value interface{}) bool { - docID := key.(string) - versions := value.([]*DocumentVersion) - newVersions := make([]*DocumentVersion, 0, len(versions)) - for _, v := range versions { - if v.Timestamp >= cutoffTime || (oldestReader > 0 && v.Timestamp >= oldestReader) { - newVersions = append(newVersions, v) - } else { - pruned++ - } - } - if len(newVersions) == 0 && len(versions) > 0 { - newVersions = append(newVersions, versions[len(versions)-1]) - pruned-- - } - if len(newVersions) != len(versions) { - m.versions.Store(docID, newVersions) - } - return true - }) - - if pruned > 0 { - m.stats.TotalVersionsPruned.Add(uint64(pruned)) - } - if skipped > 0 { - m.stats.TotalSkippedPrune.Add(uint64(skipped)) - } -} - -// GetMVCCStats возвращает статистику MVCC -func (m *MVCCManager) GetMVCCStats() map[string]interface{} { - return map[string]interface{}{ - "total_versions_created": m.stats.TotalVersionsCreated.Load(), - "total_versions_pruned": m.stats.TotalVersionsPruned.Load(), - "total_cache_hits": m.stats.TotalCacheHits.Load(), - "total_cache_misses": m.stats.TotalCacheMisses.Load(), - "total_visibility_hits": m.stats.TotalVisibilityHits.Load(), - "total_visibility_misses": m.stats.TotalVisibilityMisses.Load(), - "total_skipped_prune": m.stats.TotalSkippedPrune.Load(), - "max_versions_per_doc": m.maxVersionsPerDoc, - "retention_days": int(m.retentionDuration.Hours() / 24), - "oldest_read_tx": m.oldestReadTx.Load(), - } -} - -// ============================================================================= -// VISIBILITY MAP -// ============================================================================= - -type VisibilityMapEntry struct { - DocID string - VisibleFrom uint64 - VisibleTo uint64 - IsVisible bool - LastAccess int64 -} - -type VisibilityMap struct { - entries sync.Map - maxSize int - hitCount atomic.Uint64 - missCount atomic.Uint64 - mu sync.RWMutex -} - -func NewVisibilityMap(maxSize int) *VisibilityMap { - if maxSize <= 0 { - maxSize = VisibilityMapSize - } - return &VisibilityMap{maxSize: maxSize} -} - -func (vm *VisibilityMap) MarkVisible(docID string, version uint64, visible bool) { - key := fmt.Sprintf("%s@%d", docID, version) - vm.entries.Store(key, &VisibilityMapEntry{ - DocID: docID, - VisibleFrom: version, - VisibleTo: version, - IsVisible: visible, - LastAccess: time.Now().Unix(), - }) -} - -func (vm *VisibilityMap) IsVisible(docID string, version uint64) bool { - key := fmt.Sprintf("%s@%d", docID, version) - if val, ok := vm.entries.Load(key); ok { - entry := val.(*VisibilityMapEntry) - entry.LastAccess = time.Now().Unix() - vm.hitCount.Add(1) - return entry.IsVisible - } - - var found bool - vm.entries.Range(func(k, v interface{}) bool { - entry := v.(*VisibilityMapEntry) - if entry.DocID == docID && version >= entry.VisibleFrom && version <= entry.VisibleTo && entry.IsVisible { - found = true - return false - } - return true - }) - - if found { - vm.hitCount.Add(1) - return true - } - vm.missCount.Add(1) - return false -} - -func (vm *VisibilityMap) GetStats() map[string]interface{} { - count := 0 - vm.entries.Range(func(_, _ interface{}) bool { - count++ - return true - }) - return map[string]interface{}{ - "hits": vm.hitCount.Load(), - "misses": vm.missCount.Load(), - "entries": count, - "max_size": vm.maxSize, - } -} - -// ============================================================================= -// READ TIMESTAMP CACHE -// ============================================================================= - -type ReadTimestampCache struct { - cache sync.Map - maxSize int - ttl time.Duration - hits atomic.Uint64 - misses atomic.Uint64 - size atomic.Int64 - mu sync.RWMutex -} - -type cachedEntry struct { - doc *Document - cachedAt time.Time - accessCount int64 -} - -func NewReadTimestampCache(maxSize int, ttl time.Duration) *ReadTimestampCache { - if maxSize <= 0 { - maxSize = 10000 - } - if ttl <= 0 { - ttl = 5 * time.Minute - } - c := &ReadTimestampCache{maxSize: maxSize, ttl: ttl} - go c.cleanupLoop() - return c -} - -func (rtc *ReadTimestampCache) Get(docID string, timestamp int64) *Document { - key := fmt.Sprintf("%s@%d", docID, timestamp) - val, ok := rtc.cache.Load(key) - if !ok { - rtc.misses.Add(1) - return nil - } - entry := val.(*cachedEntry) - if time.Since(entry.cachedAt) > rtc.ttl { - rtc.cache.Delete(key) - rtc.size.Add(-1) - rtc.misses.Add(1) - return nil - } - entry.accessCount++ - rtc.hits.Add(1) - return entry.doc -} - -func (rtc *ReadTimestampCache) Set(docID string, timestamp int64, doc *Document) { - key := fmt.Sprintf("%s@%d", docID, timestamp) - if rtc.size.Load() >= int64(rtc.maxSize) { - rtc.evictOldest() - } - rtc.cache.Store(key, &cachedEntry{doc: doc, cachedAt: time.Now(), accessCount: 0}) - rtc.size.Add(1) -} - -func (rtc *ReadTimestampCache) evictOldest() { - var oldestKey interface{} - var oldestTime time.Time - rtc.cache.Range(func(key, value interface{}) bool { - entry := value.(*cachedEntry) - if oldestKey == nil || entry.cachedAt.Before(oldestTime) { - oldestKey = key - oldestTime = entry.cachedAt - } - return true - }) - if oldestKey != nil { - rtc.cache.Delete(oldestKey) - rtc.size.Add(-1) - } -} - -func (rtc *ReadTimestampCache) cleanupLoop() { - ticker := time.NewTicker(rtc.ttl) - defer ticker.Stop() - for range ticker.C { - rtc.cache.Range(func(key, value interface{}) bool { - entry := value.(*cachedEntry) - if time.Since(entry.cachedAt) > rtc.ttl { - rtc.cache.Delete(key) - rtc.size.Add(-1) - } - return true - }) - } -} - -func (rtc *ReadTimestampCache) GetStats() map[string]interface{} { - return map[string]interface{}{ - "hits": rtc.hits.Load(), - "misses": rtc.misses.Load(), - "size": rtc.size.Load(), - "max_size": rtc.maxSize, - "ttl_secs": int(rtc.ttl.Seconds()), - } -} - -// ============================================================================= -// PERSISTENT SAGA STATE -// ============================================================================= - -type SagaState struct { - ID string `json:"id"` - Status string `json:"status"` - CurrentStep int `json:"current_step"` - Steps []SagaStepState `json:"steps"` - Data map[string]interface{} `json:"data"` - CreatedAt int64 `json:"created_at"` - UpdatedAt int64 `json:"updated_at"` - CompletedAt int64 `json:"completed_at,omitempty"` - CompensationExecuted bool `json:"compensation_executed"` - NodeID string `json:"node_id"` - CoordinatorID string `json:"coordinator_id"` - Version uint64 `json:"version"` - RetryCount int `json:"retry_count"` - LastError string `json:"last_error,omitempty"` - ExecutionID string `json:"execution_id"` -} - -type SagaStepState struct { - ID string `json:"id"` - Name string `json:"name"` - Status string `json:"status"` - Data map[string]interface{} `json:"data"` - StartedAt int64 `json:"started_at"` - CompletedAt int64 `json:"completed_at"` - ExecutionID string `json:"execution_id"` - RetryCount int `json:"retry_count"` - LastError string `json:"last_error,omitempty"` - CompensatedAt int64 `json:"compensated_at,omitempty"` -} - -type SagaPersistentStorage struct { - baseDir string - mu sync.RWMutex - cache map[string]*SagaState - cacheSize int - maxCache int - logger LoggerInterface - fsyncEnabled bool - fsyncMaxRetries int - fsyncRetryDelay time.Duration -} - -func NewSagaPersistentStorage(baseDir string, logger LoggerInterface) (*SagaPersistentStorage, error) { - return NewSagaPersistentStorageWithConfig(nil, logger) -} - -func NewSagaPersistentStorageWithConfig(cfg *config.SagaConfig, logger LoggerInterface) (*SagaPersistentStorage, error) { - baseDir := SagaStateDir - maxCache := 10000 - fsyncEnabled := true - fsyncMaxRetries := 3 - fsyncRetryDelay := 100 * time.Millisecond - - if cfg != nil { - baseDir = cfg.GetStateDir() - maxCache = cfg.GetMaxCacheSize() - fsyncEnabled = cfg.IsFsyncEnabled() - fsyncMaxRetries = cfg.GetFsyncMaxRetries() - fsyncRetryDelay = cfg.GetFsyncRetryDelay() - } - - fullPath := filepath.Join(baseDir) - if err := os.MkdirAll(fullPath, 0755); err != nil { - return nil, fmt.Errorf("failed to create saga state directory: %v", err) - } - - return &SagaPersistentStorage{ - baseDir: fullPath, - cache: make(map[string]*SagaState), - maxCache: maxCache, - logger: logger, - fsyncEnabled: fsyncEnabled, - fsyncMaxRetries: fsyncMaxRetries, - fsyncRetryDelay: fsyncRetryDelay, - }, nil -} - -func (sps *SagaPersistentStorage) getStatePath(sagaID string) string { - return filepath.Join(sps.baseDir, fmt.Sprintf("%s%s%s", SagaStateFilePrefix, sagaID, SagaStateFileSuffix)) -} - -// Save сохраняет состояние SAGA на диск -func (sps *SagaPersistentStorage) Save(state *SagaState) error { - sps.mu.Lock() - defer sps.mu.Unlock() - - state.UpdatedAt = time.Now().UnixMilli() - state.Version++ - - if len(sps.cache) >= sps.maxCache { - var oldestKey string - var oldestTime int64 = time.Now().UnixMilli() - for k, v := range sps.cache { - if v.UpdatedAt < oldestTime { - oldestTime = v.UpdatedAt - oldestKey = k - } - } - if oldestKey != "" { - delete(sps.cache, oldestKey) - } - } - sps.cache[state.ID] = state - - path := sps.getStatePath(state.ID) - data, err := json.MarshalIndent(state, "", " ") - if err != nil { - return fmt.Errorf("failed to marshal saga state: %v", err) - } - - tmpPath := path + ".tmp" - if err := os.WriteFile(tmpPath, data, 0644); err != nil { - return fmt.Errorf("failed to write saga state: %v", err) - } - - if sps.fsyncEnabled { - if f, err := os.OpenFile(tmpPath, os.O_RDWR, 0644); err == nil { - for i := 0; i < sps.fsyncMaxRetries; i++ { - if err := RealFsyncWithRetry(f, sps.fsyncMaxRetries, sps.fsyncRetryDelay); err == nil { - break - } - if i < sps.fsyncMaxRetries-1 { - time.Sleep(sps.fsyncRetryDelay) - } - } - f.Close() - } - } - - if err := os.Rename(tmpPath, path); err != nil { - return fmt.Errorf("failed to rename saga state: %v", err) - } - - if sps.fsyncEnabled { - FsyncDir(sps.baseDir) - } - - if sps.logger != nil { - sps.logger.Debug(fmt.Sprintf("Saved saga state %s (version %d, status %s)", state.ID, state.Version, state.Status)) - } - return nil -} - -func (sps *SagaPersistentStorage) Load(sagaID string) (*SagaState, error) { - sps.mu.RLock() - if state, ok := sps.cache[sagaID]; ok { - sps.mu.RUnlock() - return state, nil - } - sps.mu.RUnlock() - - path := sps.getStatePath(sagaID) - data, err := os.ReadFile(path) - if err != nil { - if os.IsNotExist(err) { - return nil, nil - } - return nil, fmt.Errorf("failed to read saga state: %v", err) - } - - var state SagaState - if err := json.Unmarshal(data, &state); err != nil { - return nil, fmt.Errorf("failed to unmarshal saga state: %v", err) - } - - sps.mu.Lock() - sps.cache[sagaID] = &state - sps.mu.Unlock() - return &state, nil -} - -func (sps *SagaPersistentStorage) Delete(sagaID string) error { - sps.mu.Lock() - delete(sps.cache, sagaID) - sps.mu.Unlock() - - path := sps.getStatePath(sagaID) - if err := os.Remove(path); err != nil && !os.IsNotExist(err) { - return fmt.Errorf("failed to delete saga state: %v", err) - } - return nil -} - -func (sps *SagaPersistentStorage) ListAll() ([]*SagaState, error) { - pattern := filepath.Join(sps.baseDir, fmt.Sprintf("%s*%s", SagaStateFilePrefix, SagaStateFileSuffix)) - files, err := filepath.Glob(pattern) - if err != nil { - return nil, err - } - - states := make([]*SagaState, 0, len(files)) - for _, file := range files { - data, err := os.ReadFile(file) - if err != nil { - continue - } - var state SagaState - if err := json.Unmarshal(data, &state); err != nil { - continue - } - states = append(states, &state) - } - return states, nil -} - -func (sps *SagaPersistentStorage) ListPending() ([]*SagaState, error) { - all, err := sps.ListAll() - if err != nil { - return nil, err - } - pending := make([]*SagaState, 0) - for _, state := range all { - if state.Status == "pending" || state.Status == "running" || state.Status == "compensating" { - pending = append(pending, state) - } - } - return pending, nil -} - -// ============================================================================= -// SAGA ORCHESTRATOR -// ============================================================================= - -type SagaOrchestrator struct { - storage *SagaPersistentStorage - coordinators []*SagaCoordinator - mu sync.RWMutex - logger LoggerInterface - nodeID string - stopChan chan struct{} - wg sync.WaitGroup - isLeader atomic.Bool - leaderID string - electionMu sync.Mutex - config *config.SagaConfig - metrics *SagaMetrics -} - -type SagaCoordinator struct { - id string - orchestrator *SagaOrchestrator - activeSagas sync.Map - stopChan chan struct{} - wg sync.WaitGroup - isActive bool - config *config.SagaConfig - mu sync.RWMutex -} - -type SagaMetrics struct { - TotalStarted atomic.Uint64 - TotalCompleted atomic.Uint64 - TotalAborted atomic.Uint64 - TotalFailed atomic.Uint64 - TotalCompensated atomic.Uint64 - ActiveCount atomic.Int64 - AvgDurationMs atomic.Uint64 - TotalDurationMs atomic.Uint64 - RecoveryCount atomic.Uint64 - mu sync.RWMutex - latencies []int64 - maxLatency int64 - minLatency int64 -} - -func NewSagaOrchestrator(baseDir string, nodeID string, logger LoggerInterface) (*SagaOrchestrator, error) { - return NewSagaOrchestratorWithConfig(nil, nodeID, logger) -} - -func NewSagaOrchestratorWithConfig(cfg *config.SagaConfig, nodeID string, logger LoggerInterface) (*SagaOrchestrator, error) { - if cfg == nil { - cfg = &config.SagaConfig{ - Enabled: true, - CoordinatorCount: 3, - StateDir: "saga_states", - MaxRetries: 5, - RetryBackoffMs: 100, - SagaTimeoutSec: 300, - StuckCheckIntervalSec: 10, - LeaderElectionIntervalSec: 5, - RecoveryIntervalSec: 30, - MetricsIntervalSec: 60, - CleanupPeriodHours: 24, - MaxCacheSize: 10000, - OperationRetentionDays: 7, - ChannelBufferSize: 10000, - AsyncRecoveryWorkers: 4, - AsyncRecoveryTimeoutSec: 30, - FsyncEnabled: true, - FsyncMaxRetries: 3, - FsyncRetryDelayMs: 100, - } - } - - storage, err := NewSagaPersistentStorageWithConfig(cfg, logger) - if err != nil { - return nil, err - } - - o := &SagaOrchestrator{ - storage: storage, - logger: logger, - nodeID: nodeID, - stopChan: make(chan struct{}, cfg.GetChannelBufferSize()), - metrics: &SagaMetrics{minLatency: -1}, - coordinators: make([]*SagaCoordinator, 0), - config: cfg, - } - - coordinatorCount := cfg.GetCoordinatorCount() - for i := 0; i < coordinatorCount; i++ { - coord := &SagaCoordinator{ - id: fmt.Sprintf("%s-coord-%d", nodeID, i), - orchestrator: o, - stopChan: make(chan struct{}, cfg.GetChannelBufferSize()), - isActive: true, - config: cfg, - } - o.coordinators = append(o.coordinators, coord) - coord.wg.Add(1) - go coord.run() - } - - o.wg.Add(1) - go o.leaderElectionLoop() - o.wg.Add(1) - go o.recoveryLoop() - o.wg.Add(1) - go o.metricsLoop() - // ИСПРАВЛЕНО: Запуск очистки orphan-шагов - o.wg.Add(1) - go o.orphanCleanupLoop() - - if cfg.IsSagaEnabled() && logger != nil { - logger.Info(fmt.Sprintf("Saga orchestrator initialized on node %s with %d coordinators", nodeID, coordinatorCount)) - } - return o, nil -} - -func (o *SagaOrchestrator) leaderElectionLoop() { - defer o.wg.Done() - ticker := time.NewTicker(o.config.GetLeaderElectionInterval()) - defer ticker.Stop() - for { - select { - case <-ticker.C: - o.electLeader() - case <-o.stopChan: - return - } - } -} - -func (o *SagaOrchestrator) electLeader() { - o.electionMu.Lock() - defer o.electionMu.Unlock() - - candidates := make([]string, 0) - o.mu.RLock() - for _, coord := range o.coordinators { - if coord.isActive { - candidates = append(candidates, coord.id) - } - } - o.mu.RUnlock() - - if len(candidates) == 0 { - o.isLeader.Store(false) - o.leaderID = "" - return - } - - sort.Strings(candidates) - leader := candidates[0] - o.leaderID = leader - isLeader := leader == o.coordinators[0].id - o.isLeader.Store(isLeader) - - if o.logger != nil { - o.logger.Debug(fmt.Sprintf("Leader elected: %s (current node %s is leader: %v)", leader, o.nodeID, isLeader)) - } -} - -func (o *SagaOrchestrator) IsLeader() bool { return o.isLeader.Load() } -func (o *SagaOrchestrator) GetLeaderID() string { return o.leaderID } - -func (o *SagaOrchestrator) recoveryLoop() { - defer o.wg.Done() - ticker := time.NewTicker(o.config.GetRecoveryInterval()) - defer ticker.Stop() - for { - select { - case <-ticker.C: - if o.IsLeader() { - o.recoverPendingSagas() - } - case <-o.stopChan: - return - } - } -} - -// ИСПРАВЛЕНО: Очистка orphan-шагов SAGA -func (o *SagaOrchestrator) orphanCleanupLoop() { - defer o.wg.Done() - ticker := time.NewTicker(SagaCleanupInterval) - defer ticker.Stop() - for { - select { - case <-ticker.C: - if o.IsLeader() { - o.cleanupOrphanSteps() - } - case <-o.stopChan: - return - } - } -} - -// cleanupOrphanSteps очищает осиротевшие шаги SAGA -func (o *SagaOrchestrator) cleanupOrphanSteps() { - pending, err := o.storage.ListPending() - if err != nil { - if o.logger != nil { - o.logger.Error(fmt.Sprintf("Failed to list pending sagas for cleanup: %v", err)) - } - return - } - - now := time.Now().UnixMilli() - for _, state := range pending { - if state.Status == "running" || state.Status == "compensating" { - elapsed := now - state.UpdatedAt - if elapsed > SagaOrphanTimeout.Milliseconds() { - if o.logger != nil { - o.logger.Warn(fmt.Sprintf("Found orphan saga %s (last updated %d ms ago), cleaning up", state.ID, elapsed)) - } - state.Status = "orphaned" - state.LastError = fmt.Sprintf("orphaned after %d ms of inactivity", elapsed) - o.storage.Save(state) - o.compensateOrphanSaga(state) - } - } - } -} - -// compensateOrphanSaga выполняет идемпотентную компенсацию осиротевшей SAGA -func (o *SagaOrchestrator) compensateOrphanSaga(state *SagaState) { - if state.CompensationExecuted { - return - } - - if o.logger != nil { - o.logger.Info(fmt.Sprintf("Compensating orphan saga %s", state.ID)) - } - - saga := &SagaTransaction{ - ID: state.ID, - Status: state.Status, - CurrentStep: state.CurrentStep, - Data: state.Data, - CreatedAt: state.CreatedAt, - UpdatedAt: state.UpdatedAt, - executedOps: make(map[string]bool), - } - - for _, stepState := range state.Steps { - step := &SagaStep{ - ID: stepState.ID, - Name: stepState.Name, - Status: stepState.Status, - Data: stepState.Data, - StartedAt: stepState.StartedAt, - CompletedAt: stepState.CompletedAt, - ExecutionID: stepState.ExecutionID, - RetryCount: stepState.RetryCount, - LastError: stepState.LastError, - } - saga.Steps = append(saga.Steps, step) - if stepState.Status == "completed" { - saga.executedOps[stepState.ExecutionID] = true - } - } - - if err := o.executeCompensation(saga, len(saga.Steps)-1); err != nil { - if o.logger != nil { - o.logger.Error(fmt.Sprintf("Failed to compensate orphan saga %s: %v", state.ID, err)) - } - } - - state.CompensationExecuted = true - state.Status = "orphaned_compensated" - o.storage.Save(state) -} - -func (o *SagaOrchestrator) recoverPendingSagas() { - pending, err := o.storage.ListPending() - if err != nil { - if o.logger != nil { - o.logger.Error(fmt.Sprintf("Failed to list pending sagas: %v", err)) - } - return - } - if len(pending) == 0 { - return - } - if o.logger != nil { - o.logger.Info(fmt.Sprintf("Recovering %d pending sagas", len(pending))) - } - - for _, state := range pending { - if state.NodeID != "" && state.NodeID != o.nodeID { - if !o.isNodeAlive(state.NodeID) { - if o.logger != nil { - o.logger.Warn(fmt.Sprintf("Node %s is dead, taking over saga %s", state.NodeID, state.ID)) - } - state.NodeID = o.nodeID - o.storage.Save(state) - } else { - continue - } - } - - if err := o.resumeSaga(state); err != nil { - if o.logger != nil { - o.logger.Error(fmt.Sprintf("Failed to resume saga %s: %v", state.ID, err)) - } - } else { - o.metrics.RecoveryCount.Add(1) - } - } -} - -func (o *SagaOrchestrator) isNodeAlive(nodeID string) bool { - return nodeID == o.nodeID -} - -func (o *SagaOrchestrator) resumeSaga(state *SagaState) error { - saga := &SagaTransaction{ - ID: state.ID, - Status: state.Status, - CurrentStep: state.CurrentStep, - Data: state.Data, - CreatedAt: state.CreatedAt, - UpdatedAt: state.UpdatedAt, - compensationExecuted: state.CompensationExecuted, - executedOps: make(map[string]bool), - } - - saga.Steps = make([]*SagaStep, len(state.Steps)) - for i, stepState := range state.Steps { - saga.Steps[i] = &SagaStep{ - ID: stepState.ID, - Name: stepState.Name, - Status: stepState.Status, - Data: stepState.Data, - StartedAt: stepState.StartedAt, - CompletedAt: stepState.CompletedAt, - ExecutionID: stepState.ExecutionID, - RetryCount: stepState.RetryCount, - LastError: stepState.LastError, - } - if stepState.Status == "completed" { - saga.executedOps[stepState.ExecutionID] = true - } - } - - o.mu.Lock() - for _, coord := range o.coordinators { - coord.activeSagas.Store(state.ID, saga) - } - o.mu.Unlock() - - return o.executeSagaInternal(saga) -} - -func (o *SagaOrchestrator) metricsLoop() { - defer o.wg.Done() - ticker := time.NewTicker(o.config.GetMetricsInterval()) - defer ticker.Stop() - for { - select { - case <-ticker.C: - if o.logger != nil { - metrics := o.GetMetrics() - o.logger.Debug(fmt.Sprintf("Saga metrics: started=%d, completed=%d, aborted=%d, active=%d", - metrics["total_started"], metrics["total_completed"], metrics["total_aborted"], metrics["active_count"])) - } - case <-o.stopChan: - return - } - } -} - -// BeginSaga начинает новую SAGA транзакцию -func (o *SagaOrchestrator) BeginSaga(id string) (*SagaTransaction, error) { - if !o.IsLeader() { - return nil, fmt.Errorf("current node is not the leader") - } - - existing, err := o.storage.Load(id) - if err != nil { - return nil, err - } - if existing != nil { - return nil, fmt.Errorf("saga %s already exists", id) - } - - now := time.Now().UnixMilli() - state := &SagaState{ - ID: id, - Status: "pending", - CurrentStep: 0, - Data: make(map[string]interface{}), - CreatedAt: now, - UpdatedAt: now, - NodeID: o.nodeID, - CoordinatorID: o.coordinators[0].id, - Version: 1, - ExecutionID: fmt.Sprintf("%s_%d", id, now), - } - - if err := o.storage.Save(state); err != nil { - return nil, err - } - - saga := &SagaTransaction{ - ID: id, - Steps: make([]*SagaStep, 0), - CurrentStep: 0, - Status: "pending", - CreatedAt: now, - UpdatedAt: now, - Data: make(map[string]interface{}), - executedOps: make(map[string]bool), - } - - o.mu.RLock() - for _, coord := range o.coordinators { - coord.activeSagas.Store(id, saga) - } - o.mu.RUnlock() - - o.metrics.TotalStarted.Add(1) - o.metrics.ActiveCount.Add(1) - - LogTransactionAudit(TransactionID(0), "SAGA_BEGIN", TransactionActive, map[string]interface{}{ - "saga_id": id, - "node_id": o.nodeID, - }) - - if o.logger != nil { - o.logger.Info(fmt.Sprintf("Saga %s started on node %s", id, o.nodeID)) - } - return saga, nil -} - -// Execute выполняет SAGA транзакцию -func (o *SagaOrchestrator) Execute(saga *SagaTransaction) error { - if !o.IsLeader() { - return fmt.Errorf("current node is not the leader") - } - return o.executeSagaInternal(saga) -} - -// executeSagaInternal внутренняя реализация выполнения SAGA -// ИСПРАВЛЕНО: Идемпотентные компенсации через executedOps -func (o *SagaOrchestrator) executeSagaInternal(saga *SagaTransaction) error { - saga.mu.Lock() - defer saga.mu.Unlock() - - if saga.Status != "pending" && saga.Status != "running" { - return fmt.Errorf("saga %s is not in pending or running state", saga.ID) - } - - saga.Status = "running" - saga.UpdatedAt = time.Now().UnixMilli() - - if err := o.saveSagaState(saga); err != nil { - return err - } - - startTime := time.Now() - - for i := saga.CurrentStep; i < len(saga.Steps); i++ { - step := saga.Steps[i] - saga.CurrentStep = i - - if step.Status == "completed" { - continue - } - - step.Status = "running" - step.StartedAt = time.Now().UnixMilli() - - if o.logger != nil { - o.logger.Debug(fmt.Sprintf("Executing saga step %s: %s (execution_id: %s)", saga.ID, step.Name, step.ExecutionID)) - } - - // ИСПРАВЛЕНО: Проверка идемпотентности - if saga.HasExecuted(step.ExecutionID) { - if o.logger != nil { - o.logger.Debug(fmt.Sprintf("Saga step %s already executed (idempotent), skipping", step.Name)) - } - step.Status = "completed" - step.CompletedAt = time.Now().UnixMilli() - continue - } - - var err error - maxRetries := SagaMaxRetries - if o.config != nil { - maxRetries = o.config.GetMaxRetries() - } - for retry := 0; retry < maxRetries; retry++ { - step.RetryCount = retry + 1 - if err = step.Execute(); err == nil { - break - } - step.LastError = err.Error() - if o.logger != nil { - o.logger.Warn(fmt.Sprintf("Saga step %s failed (attempt %d/%d): %v", step.Name, retry+1, maxRetries, err)) - } - backoff := time.Duration(100*(1<= 0; j-- { - step := saga.Steps[j] - if step.Status == "compensated" || step.Status == "pending" { - continue - } - - if step.Status == "completed" { - if o.logger != nil { - o.logger.Debug(fmt.Sprintf("Compensating step %s", step.Name)) - } - - var err error - maxRetries := SagaMaxRetries - if o.config != nil { - maxRetries = o.config.GetMaxRetries() - } - for retry := 0; retry < maxRetries; retry++ { - if err = step.Compensate(); err == nil { - break - } - if o.logger != nil { - o.logger.Warn(fmt.Sprintf("Compensation for step %s failed (attempt %d/%d): %v", step.Name, retry+1, maxRetries, err)) - } - backoff := time.Duration(100*(1< o.metrics.maxLatency { - o.metrics.maxLatency = durationMs - } - - o.metrics.latencies = append(o.metrics.latencies, durationMs) - if len(o.metrics.latencies) > 1000 { - o.metrics.latencies = o.metrics.latencies[1:] - } -} - -func (o *SagaOrchestrator) GetMetrics() map[string]interface{} { - o.metrics.mu.RLock() - defer o.metrics.mu.RUnlock() - - latencies := make([]int64, len(o.metrics.latencies)) - copy(latencies, o.metrics.latencies) - sort.Slice(latencies, func(i, j int) bool { return latencies[i] < latencies[j] }) - - p50, p95, p99 := int64(0), int64(0), int64(0) - if len(latencies) > 0 { - p50 = latencies[int(float64(len(latencies))*0.5)] - p95 = latencies[int(float64(len(latencies))*0.95)] - p99 = latencies[int(float64(len(latencies))*0.99)] - } - - return map[string]interface{}{ - "total_started": o.metrics.TotalStarted.Load(), - "total_completed": o.metrics.TotalCompleted.Load(), - "total_aborted": o.metrics.TotalAborted.Load(), - "total_failed": o.metrics.TotalFailed.Load(), - "total_compensated": o.metrics.TotalCompensated.Load(), - "active_count": o.metrics.ActiveCount.Load(), - "avg_duration_ms": o.metrics.AvgDurationMs.Load(), - "min_duration_ms": o.metrics.minLatency, - "max_duration_ms": o.metrics.maxLatency, - "p50_duration_ms": p50, - "p95_duration_ms": p95, - "p99_duration_ms": p99, - "recovery_count": o.metrics.RecoveryCount.Load(), - "is_leader": o.IsLeader(), - "leader_id": o.GetLeaderID(), - "node_id": o.nodeID, - } -} - -func (o *SagaOrchestrator) GetSaga(id string) (*SagaTransaction, error) { - o.mu.RLock() - for _, coord := range o.coordinators { - if val, ok := coord.activeSagas.Load(id); ok { - o.mu.RUnlock() - return val.(*SagaTransaction), nil - } - } - o.mu.RUnlock() - - state, err := o.storage.Load(id) - if err != nil { - return nil, err - } - if state == nil { - return nil, fmt.Errorf("saga %s not found", id) - } - - saga := &SagaTransaction{ - ID: state.ID, - Status: state.Status, - CurrentStep: state.CurrentStep, - Data: state.Data, - CreatedAt: state.CreatedAt, - UpdatedAt: state.UpdatedAt, - CompletedAt: state.CompletedAt, - compensationExecuted: state.CompensationExecuted, - executedOps: make(map[string]bool), - } - - for _, stepState := range state.Steps { - step := &SagaStep{ - ID: stepState.ID, - Name: stepState.Name, - Status: stepState.Status, - Data: stepState.Data, - StartedAt: stepState.StartedAt, - CompletedAt: stepState.CompletedAt, - ExecutionID: stepState.ExecutionID, - RetryCount: stepState.RetryCount, - LastError: stepState.LastError, - } - saga.Steps = append(saga.Steps, step) - if stepState.Status == "completed" { - saga.executedOps[stepState.ExecutionID] = true - } - } - return saga, nil -} - -func (o *SagaOrchestrator) Stop() { - close(o.stopChan) - o.wg.Wait() - for _, coord := range o.coordinators { - close(coord.stopChan) - coord.wg.Wait() - } - if o.logger != nil { - o.logger.Info("Saga orchestrator stopped") - } -} - -// ============================================================================= -// SAGA COORDINATOR -// ============================================================================= - -func (c *SagaCoordinator) run() { - defer c.wg.Done() - interval := c.config.GetStuckCheckInterval() - ticker := time.NewTicker(interval) - defer ticker.Stop() - - for { - select { - case <-ticker.C: - c.activeSagas.Range(func(key, value interface{}) bool { - saga := value.(*SagaTransaction) - if saga.Status == "running" { - timeout := c.config.GetSagaTimeout() - if time.Since(time.UnixMilli(saga.UpdatedAt)) > timeout { - if c.orchestrator.logger != nil { - c.orchestrator.logger.Warn(fmt.Sprintf("Saga %s appears to be stuck, attempting recovery", saga.ID)) - } - if err := c.orchestrator.resumeSagaFromStorage(saga.ID); err != nil { - c.orchestrator.logger.Error(fmt.Sprintf("Failed to recover stuck saga %s: %v", saga.ID, err)) - } - } - } - return true - }) - case <-c.stopChan: - return - } - } -} - -func (o *SagaOrchestrator) resumeSagaFromStorage(sagaID string) error { - state, err := o.storage.Load(sagaID) - if err != nil { - return err - } - if state == nil { - return fmt.Errorf("saga %s not found in storage", sagaID) - } - if state.NodeID != "" && state.NodeID != o.nodeID { - if o.isNodeAlive(state.NodeID) { - return fmt.Errorf("saga %s is being executed on node %s", sagaID, state.NodeID) - } - } - return o.resumeSaga(state) -} - -// ============================================================================= -// SAGA TRANSACTION -// ============================================================================= - -type SagaStep struct { - ID string `json:"id"` - Name string `json:"name"` - Execute func() error `json:"-"` - Compensate func() error `json:"-"` - Status string `json:"status"` - Data map[string]interface{} `json:"data"` - StartedAt int64 `json:"started_at"` - CompletedAt int64 `json:"completed_at"` - ExecutionID string `json:"execution_id"` - RetryCount int `json:"retry_count"` - LastError string `json:"last_error,omitempty"` -} - -type SagaTransaction struct { - ID string `json:"id"` - Steps []*SagaStep `json:"steps"` - CurrentStep int `json:"current_step"` - Status string `json:"status"` - CreatedAt int64 `json:"created_at"` - UpdatedAt int64 `json:"updated_at"` - CompletedAt int64 `json:"completed_at,omitempty"` - Data map[string]interface{} `json:"data"` - mu sync.RWMutex - executedOps map[string]bool `json:"-"` - compensationExecuted bool `json:"-"` -} - -func (s *SagaTransaction) AddStep(name string, execute, compensate func() error, data map[string]interface{}) *SagaTransaction { - s.mu.Lock() - defer s.mu.Unlock() - - stepID := fmt.Sprintf("%s_step_%d_%d", s.ID, len(s.Steps), time.Now().UnixNano()) - step := &SagaStep{ - ID: stepID, - Name: name, - Execute: execute, - Compensate: compensate, - Status: "pending", - Data: data, - StartedAt: time.Now().UnixMilli(), - ExecutionID: stepID, - RetryCount: 0, - } - s.Steps = append(s.Steps, step) - return s -} - -func (s *SagaTransaction) SetData(key string, value interface{}) { - s.mu.Lock() - defer s.mu.Unlock() - s.Data[key] = value -} - -func (s *SagaTransaction) GetData(key string) (interface{}, bool) { - s.mu.RLock() - defer s.mu.RUnlock() - val, ok := s.Data[key] - return val, ok -} - -func (s *SagaTransaction) HasExecuted(operationID string) bool { - s.mu.RLock() - defer s.mu.RUnlock() - _, ok := s.executedOps[operationID] - return ok -} - -func (s *SagaTransaction) MarkExecuted(operationID string) { - s.mu.Lock() - defer s.mu.Unlock() - s.executedOps[operationID] = true -} - -// ============================================================================= -// ГЛОБАЛЬНЫЕ ПЕРЕМЕННЫЕ SAGA -// ============================================================================= - -var globalSagaOrchestrator *SagaOrchestrator -var sagaOrchestratorMu sync.RWMutex - -func SetGlobalSagaOrchestrator(o *SagaOrchestrator) { - sagaOrchestratorMu.Lock() - defer sagaOrchestratorMu.Unlock() - globalSagaOrchestrator = o -} - -func GetGlobalSagaOrchestrator() *SagaOrchestrator { - sagaOrchestratorMu.RLock() - defer sagaOrchestratorMu.RUnlock() - return globalSagaOrchestrator -} - -// ============================================================================= -// SAGA MANAGER - обёртка для совместимости -// ============================================================================= - -type SagaManager struct { - orchestrator *SagaOrchestrator - sagas sync.Map - logger LoggerInterface - stopChan chan struct{} - wg sync.WaitGroup - mu sync.RWMutex - maxRetries int - executedOps sync.Map -} - -func NewSagaManager(logger LoggerInterface) *SagaManager { - orchestrator, err := NewSagaOrchestrator(SagaStateDir, "default-node", logger) - if err != nil { - if logger != nil { - logger.Error(fmt.Sprintf("Failed to create saga orchestrator: %v", err)) - } - return &SagaManager{ - logger: logger, - stopChan: make(chan struct{}), - maxRetries: 3, - } - } - - sm := &SagaManager{ - orchestrator: orchestrator, - logger: logger, - stopChan: make(chan struct{}), - maxRetries: 3, - } - sm.wg.Add(1) - go sm.cleanupExecutedOpsLoop() - return sm -} - -func (sm *SagaManager) BeginSaga(id string) *SagaTransaction { - if sm.orchestrator != nil { - saga, err := sm.orchestrator.BeginSaga(id) - if err != nil { - if sm.logger != nil { - sm.logger.Error(fmt.Sprintf("Failed to begin saga: %v", err)) - } - return &SagaTransaction{ - ID: id, - Status: "pending", - CreatedAt: time.Now().UnixMilli(), - UpdatedAt: time.Now().UnixMilli(), - Data: make(map[string]interface{}), - executedOps: make(map[string]bool), - } - } - sm.sagas.Store(id, saga) - return saga - } - - saga := &SagaTransaction{ - ID: id, - Steps: make([]*SagaStep, 0), - CurrentStep: 0, - Status: "pending", - CreatedAt: time.Now().UnixMilli(), - UpdatedAt: time.Now().UnixMilli(), - Data: make(map[string]interface{}), - executedOps: make(map[string]bool), - } - sm.sagas.Store(id, saga) - LogTransactionAudit(TransactionID(0), "SAGA_BEGIN", TransactionActive, map[string]interface{}{ - "saga_id": id, - }) - return saga -} - -func (sm *SagaManager) Execute(saga *SagaTransaction) error { - if sm.orchestrator != nil { - return sm.orchestrator.Execute(saga) - } - - saga.mu.Lock() - defer saga.mu.Unlock() - - if saga.Status != "pending" { - return fmt.Errorf("saga %s is not in pending state", saga.ID) - } - - saga.Status = "running" - saga.UpdatedAt = time.Now().UnixMilli() - - for i, step := range saga.Steps { - saga.CurrentStep = i - step.Status = "running" - step.StartedAt = time.Now().UnixMilli() - - if sm.logger != nil { - sm.logger.Debug(fmt.Sprintf("Executing saga step %s: %s", saga.ID, step.Name)) - } - - var err error - for retry := 0; retry < sm.maxRetries; retry++ { - step.RetryCount = retry + 1 - if err = step.Execute(); err == nil { - break - } - step.LastError = err.Error() - if sm.logger != nil { - sm.logger.Warn(fmt.Sprintf("Saga step %s failed (attempt %d/%d): %v", step.Name, retry+1, sm.maxRetries, err)) - } - time.Sleep(time.Duration(100*(retry+1)) * time.Millisecond) - } - - step.CompletedAt = time.Now().UnixMilli() - - if err != nil { - step.Status = "failed" - saga.Status = "compensating" - saga.UpdatedAt = time.Now().UnixMilli() - - compensationErr := sm.executeCompensation(saga, i) - if compensationErr != nil { - saga.Status = "compensation_failed" - saga.UpdatedAt = time.Now().UnixMilli() - LogTransactionAudit(TransactionID(0), "SAGA_COMPENSATION_FAILED", TransactionAborted, map[string]interface{}{ - "saga_id": saga.ID, - "failed_step": step.Name, - "error": compensationErr.Error(), - }) - return fmt.Errorf("saga %s compensation failed: %v", saga.ID, compensationErr) - } - - saga.Status = "aborted" - saga.UpdatedAt = time.Now().UnixMilli() - LogTransactionAudit(TransactionID(0), "SAGA_ABORTED", TransactionAborted, map[string]interface{}{ - "saga_id": saga.ID, - "failed_step": step.Name, - "error": err.Error(), - }) - return fmt.Errorf("saga %s aborted at step %s: %v", saga.ID, step.Name, err) - } - - step.Status = "completed" - saga.MarkExecuted(step.ExecutionID) - saga.UpdatedAt = time.Now().UnixMilli() - } - - saga.Status = "completed" - saga.UpdatedAt = time.Now().UnixMilli() - saga.CompletedAt = saga.UpdatedAt - - if sm.logger != nil { - sm.logger.Info(fmt.Sprintf("Saga %s completed successfully", saga.ID)) - } - - LogTransactionAudit(TransactionID(0), "SAGA_COMPLETED", TransactionCommitted, map[string]interface{}{ - "saga_id": saga.ID, - "steps": len(saga.Steps), - }) - return nil -} - -func (sm *SagaManager) executeCompensation(saga *SagaTransaction, failedStep int) error { - if saga.compensationExecuted { - return nil - } - - for j := failedStep; j >= 0; j-- { - step := saga.Steps[j] - if step.Status == "compensated" || step.Status == "pending" { - continue - } - - if sm.logger != nil { - sm.logger.Debug(fmt.Sprintf("Compensating step %s", step.Name)) - } - - var err error - for retry := 0; retry < sm.maxRetries; retry++ { - if err = step.Compensate(); err == nil { - break - } - if sm.logger != nil { - sm.logger.Warn(fmt.Sprintf("Compensation for step %s failed (attempt %d/%d): %v", step.Name, retry+1, sm.maxRetries, err)) - } - time.Sleep(time.Duration(100*(retry+1)) * time.Millisecond) - } - - if err != nil { - step.Status = "compensation_failed" - return fmt.Errorf("compensation for step %s failed: %v", step.Name, err) - } - - step.Status = "compensated" - step.CompletedAt = time.Now().UnixMilli() - } - - saga.compensationExecuted = true - return nil -} - -func (sm *SagaManager) cleanupExecutedOpsLoop() { - defer sm.wg.Done() - ticker := time.NewTicker(24 * time.Hour) - defer ticker.Stop() - cutoff := int64(7 * 24 * 3600 * 1000) - - for { - select { - case <-ticker.C: - now := time.Now().UnixMilli() - sm.executedOps.Range(func(key, value interface{}) bool { - if ts, ok := value.(int64); ok && now-ts > cutoff { - sm.executedOps.Delete(key) - } - return true - }) - case <-sm.stopChan: - return - } - } -} - -func (sm *SagaManager) GetSaga(id string) (*SagaTransaction, error) { - if sm.orchestrator != nil { - return sm.orchestrator.GetSaga(id) - } - if val, ok := sm.sagas.Load(id); ok { - return val.(*SagaTransaction), nil - } - return nil, fmt.Errorf("saga %s not found", id) -} - -func (sm *SagaManager) GetSagaStatus(id string) (string, error) { - saga, err := sm.GetSaga(id) - if err != nil { - return "", err - } - saga.mu.RLock() - defer saga.mu.RUnlock() - return saga.Status, nil -} - -func (sm *SagaManager) GetActiveSagas() []*SagaTransaction { - result := make([]*SagaTransaction, 0) - sm.sagas.Range(func(key, value interface{}) bool { - saga := value.(*SagaTransaction) - saga.mu.RLock() - status := saga.Status - saga.mu.RUnlock() - if status == "pending" || status == "running" { - result = append(result, saga) - } - return true - }) - return result -} - -func (sm *SagaManager) GetOrchestrator() *SagaOrchestrator { - return sm.orchestrator -} - -func (sm *SagaManager) Stop() { - close(sm.stopChan) - sm.wg.Wait() - if sm.orchestrator != nil { - sm.orchestrator.Stop() - } -} - -// ============================================================================= -// ОСТАЛЬНЫЕ ТИПЫ -// ============================================================================= - -type Operation struct { - Type string `json:"type"` - Database string `json:"database"` - Collection string `json:"collection"` - DocumentID string `json:"document_id"` - Data map[string]interface{} `json:"data"` - Version uint64 `json:"version"` - OldData map[string]interface{} `json:"old_data"` -} - -type DocumentVersion struct { - Document *Document `json:"document"` - Timestamp int64 `json:"timestamp"` - TxID TransactionID `json:"tx_id"` - VersionID string `json:"version_id"` -} - -// ============================================================================= -// WAL MANAGER - ИСПРАВЛЕНО: защита от torn write -// ============================================================================= - -type WALManager struct { - mu sync.RWMutex - file *os.File - writer *bufio.Writer - path string - currentLSN uint64 - lastSync time.Time - syncInterval time.Duration - bufferSize int - closed bool - writeChan chan *WALRecord - stopChan chan struct{} - wg sync.WaitGroup - batchSize int - fsyncEnabled bool -} - -func NewWALManager(path string, fsyncEnabled bool) (*WALManager, error) { - dir := filepath.Dir(path) - if err := os.MkdirAll(dir, 0755); err != nil { - return nil, fmt.Errorf("failed to create WAL directory: %v", err) - } - - file, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644) - if err != nil { - return nil, fmt.Errorf("failed to open WAL file: %v", err) - } - - var currentLSN uint64 = 1 - stat, err := file.Stat() - if err == nil && stat.Size() > 0 { - currentLSN = uint64(stat.Size()) / 100 - if currentLSN < 1 { - currentLSN = 1 - } - } - - wm := &WALManager{ - file: file, - writer: bufio.NewWriterSize(file, 64*1024), - path: path, - currentLSN: currentLSN, - lastSync: time.Now(), - syncInterval: 5 * time.Second, - bufferSize: 64 * 1024, - writeChan: make(chan *WALRecord, 10000), - stopChan: make(chan struct{}), - batchSize: 100, - fsyncEnabled: fsyncEnabled, - } - - wm.wg.Add(1) - go wm.writerLoop() - return wm, nil -} - -func (wm *WALManager) writerLoop() { - defer wm.wg.Done() - batch := make([]*WALRecord, 0, wm.batchSize) - ticker := time.NewTicker(wm.syncInterval) - defer ticker.Stop() - - for { - select { - case record, ok := <-wm.writeChan: - if !ok { - if len(batch) > 0 { - wm.flushBatch(batch) - } - return - } - batch = append(batch, record) - if len(batch) >= wm.batchSize { - wm.flushBatch(batch) - batch = batch[:0] - } - case <-ticker.C: - if len(batch) > 0 { - wm.flushBatch(batch) - batch = batch[:0] - } - if time.Since(wm.lastSync) >= wm.syncInterval { - wm.sync() - } - case <-wm.stopChan: - if len(batch) > 0 { - wm.flushBatch(batch) - } - wm.sync() - return - } - } -} - -// flushBatch - ИСПРАВЛЕНО: добавлена запись CRC -func (wm *WALManager) flushBatch(batch []*WALRecord) { - wm.mu.Lock() - defer wm.mu.Unlock() - - for _, record := range batch { - data, err := json.Marshal(record) - if err != nil { - continue - } - - record.CRC = crc32(data) - record.Length = uint32(len(data)) - - dataWithCRC, err := json.Marshal(record) - if err != nil { - continue - } - - header := make([]byte, 8) - binary.BigEndian.PutUint32(header[0:4], uint32(len(dataWithCRC))) - binary.BigEndian.PutUint32(header[4:8], record.CRC) - - if _, err := wm.writer.Write(header); err != nil { - continue - } - if _, err := wm.writer.Write(dataWithCRC); err != nil { - continue - } - - record.LSN = wm.currentLSN - wm.currentLSN++ - } -} - -func (wm *WALManager) sync() { - wm.mu.Lock() - defer wm.mu.Unlock() - - if err := wm.writer.Flush(); err == nil { - if wm.fsyncEnabled { - if err := RealFsyncWithRetry(wm.file, FsyncMaxRetries, FsyncRetryDelay); err == nil { - wm.lastSync = time.Now() - } - } else { - wm.lastSync = time.Now() - } - } -} - -func (wm *WALManager) Write(record *WALRecord) error { - if wm.closed { - return fmt.Errorf("WAL is closed") - } - record.Timestamp = time.Now().UnixMilli() - data, err := json.Marshal(record.Data) - if err != nil { - return err - } - record.CRC = crc32(data) - - select { - case wm.writeChan <- record: - return nil - case <-time.After(100 * time.Millisecond): - return fmt.Errorf("WAL write timeout") - } -} - -func (wm *WALManager) Sync() error { - wm.mu.Lock() - defer wm.mu.Unlock() - if err := wm.writer.Flush(); err != nil { - return err - } - if wm.fsyncEnabled { - return RealFsyncWithRetry(wm.file, FsyncMaxRetries, FsyncRetryDelay) - } - return nil -} - -// ReadAll - ИСПРАВЛЕНО: проверка CRC и обработка torn write -func (wm *WALManager) ReadAll() ([]*WALRecord, error) { - wm.mu.RLock() - defer wm.mu.RUnlock() - - wm.writer.Flush() - - file, err := os.Open(wm.path) - if err != nil { - return nil, err - } - defer file.Close() - - records := make([]*WALRecord, 0) - reader := bufio.NewReader(file) - headerBuf := make([]byte, 8) - - for { - _, err := io.ReadFull(reader, headerBuf) - if err != nil { - break - } - - recordLen := binary.BigEndian.Uint32(headerBuf[0:4]) - expectedCRC := binary.BigEndian.Uint32(headerBuf[4:8]) - - if recordLen == 0 || recordLen > 100*1024*1024 { - break - } - - recordData := make([]byte, recordLen) - _, err = io.ReadFull(reader, recordData) - if err != nil { - break - } - - var record WALRecord - if err := json.Unmarshal(recordData, &record); err != nil { - continue - } - - data, _ := json.Marshal(record) - calculatedCRC := crc32(data) - if calculatedCRC != expectedCRC && calculatedCRC != record.CRC { - continue - } - records = append(records, &record) - } - return records, nil -} - -func (wm *WALManager) Close() error { - wm.mu.Lock() - wm.closed = true - wm.mu.Unlock() - - close(wm.stopChan) - close(wm.writeChan) - wm.wg.Wait() - - wm.mu.Lock() - defer wm.mu.Unlock() - - if err := wm.writer.Flush(); err != nil { - return err - } - if wm.fsyncEnabled { - RealFsync(wm.file) - } - return wm.file.Close() -} - -// ============================================================================= -// SEGMENTED WAL MANAGER - ИСПРАВЛЕНО: защита от потери tail-сегмента -// ============================================================================= - -type WALSegment struct { - ID uint32 - File *os.File - Writer *bufio.Writer - Path string - StartLSN uint64 - EndLSN uint64 - Size int64 - mu sync.Mutex -} - -type WALIndexEntry struct { - LSN uint64 - SegmentID uint32 - Offset int64 - Length uint32 - Checksum uint32 -} - -type WALIndexManager struct { - index map[uint64]*WALIndexEntry - segments map[uint32]*WALSegment - mu sync.RWMutex - indexPath string -} - -type SegmentedWALManager struct { - segmentsDir string - segments map[uint32]*WALSegment - currentSegment *WALSegment - currentSegmentID uint32 - index *WALIndexManager - mu sync.RWMutex - writeChan chan *WALRecord - stopCh chan struct{} - wg sync.WaitGroup - batchSize int - logger LoggerInterface - recoveryManager *AsyncRecoveryManager - recoveryComplete atomic.Bool - backupLSN atomic.Uint64 - fsyncEnabled bool -} - -func NewSegmentedWALManager(segmentsDir string, fsyncEnabled bool, logger LoggerInterface) (*SegmentedWALManager, error) { - if err := os.MkdirAll(segmentsDir, 0755); err != nil { - return nil, fmt.Errorf("failed to create segments dir: %v", err) - } - - wm := &SegmentedWALManager{ - segmentsDir: segmentsDir, - segments: make(map[uint32]*WALSegment), - index: &WALIndexManager{ - index: make(map[uint64]*WALIndexEntry), - segments: make(map[uint32]*WALSegment), - indexPath: filepath.Join(segmentsDir, WALIndexPrefix+"index.json"), - }, - writeChan: make(chan *WALRecord, 10000), - stopCh: make(chan struct{}), - batchSize: 100, - logger: logger, - fsyncEnabled: fsyncEnabled, - } - - if err := wm.loadExistingSegments(); err != nil { - return nil, err - } - if err := wm.index.load(); err != nil { - if logger != nil { - logger.Warn(fmt.Sprintf("Failed to load WAL index: %v", err)) - } - } - - // ИСПРАВЛЕНО: Валидация сегментов - if err := wm.validateSegments(); err != nil { - if logger != nil { - logger.Warn(fmt.Sprintf("WAL segment validation failed: %v", err)) - } - } - - if wm.currentSegment == nil { - if err := wm.rotateSegment(); err != nil { - return nil, err - } - } - - wm.wg.Add(1) - go wm.writerLoop() - return wm, nil -} - -// validateSegments - ИСПРАВЛЕНО: проверка существования файлов сегментов -func (wm *SegmentedWALManager) validateSegments() error { - wm.mu.Lock() - defer wm.mu.Unlock() - - for id, segment := range wm.segments { - if segment.File == nil { - file, err := os.OpenFile(segment.Path, os.O_RDWR, 0644) - if err != nil { - if wm.logger != nil { - wm.logger.Warn(fmt.Sprintf("WAL segment %d file missing: %s", id, segment.Path)) - } - delete(wm.segments, id) - continue - } - segment.File = file - segment.Writer = bufio.NewWriterSize(file, 64*1024) - } - } - return nil -} - -func (wm *SegmentedWALManager) GetBackupLSN() uint64 { return wm.backupLSN.Load() } -func (wm *SegmentedWALManager) SetBackupLSN(lsn uint64) { wm.backupLSN.Store(lsn) } - -func (wm *SegmentedWALManager) loadExistingSegments() error { - files, err := filepath.Glob(filepath.Join(wm.segmentsDir, WALSegmentPrefix+"*")) - if err != nil { - return err - } - - for _, filePath := range files { - var segmentID uint32 - if _, err := fmt.Sscanf(filepath.Base(filePath), WALSegmentPrefix+"%d.log", &segmentID); err != nil { - continue - } - - file, err := os.OpenFile(filePath, os.O_RDWR, 0644) - if err != nil { - continue - } - - stat, _ := file.Stat() - segment := &WALSegment{ - ID: segmentID, - File: file, - Writer: bufio.NewWriterSize(file, 64*1024), - Path: filePath, - Size: stat.Size(), - StartLSN: uint64(segmentID) * WALSegmentSize / 100, - } - wm.segments[segmentID] = segment - - if segmentID > wm.currentSegmentID { - wm.currentSegmentID = segmentID - wm.currentSegment = segment - } - } - return nil -} - -// rotateSegment - ИСПРАВЛЕНО: полная синхронизация перед ротацией -func (wm *SegmentedWALManager) rotateSegment() error { - wm.mu.Lock() - defer wm.mu.Unlock() - - newSegmentID := wm.currentSegmentID + 1 - segmentPath := filepath.Join(wm.segmentsDir, fmt.Sprintf(WALSegmentPrefix+"%d.log", newSegmentID)) - - file, err := os.OpenFile(segmentPath, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644) - if err != nil { - return fmt.Errorf("failed to create segment: %v", err) - } - - newSegment := &WALSegment{ - ID: newSegmentID, - File: file, - Writer: bufio.NewWriterSize(file, 64*1024), - Path: segmentPath, - StartLSN: wm.getCurrentLSN(), - } - - // ИСПРАВЛЕНО: Полная синхронизация старого сегмента - if wm.currentSegment != nil { - if err := wm.currentSegment.Writer.Flush(); err != nil { - if wm.logger != nil { - wm.logger.Error(fmt.Sprintf("Failed to flush old segment: %v", err)) - } - } - if wm.fsyncEnabled { - if err := RealFsyncWithRetry(wm.currentSegment.File, FsyncMaxRetries, FsyncRetryDelay); err != nil { - if wm.logger != nil { - wm.logger.Error(fmt.Sprintf("Failed to fsync old segment: %v", err)) - } - } - } - wm.currentSegment.EndLSN = wm.getCurrentLSN() - wm.currentSegment.File.Close() - // ИСПРАВЛЕНО: Синхронизация директории - FsyncDir(wm.segmentsDir) - } - - wm.currentSegment = newSegment - wm.currentSegmentID = newSegmentID - wm.segments[newSegmentID] = newSegment - - if wm.logger != nil { - wm.logger.Info(fmt.Sprintf("Created new WAL segment: %d", newSegmentID)) - } - return nil -} - -func (wm *SegmentedWALManager) getCurrentLSN() uint64 { - wm.mu.RLock() - defer wm.mu.RUnlock() - if wm.currentSegment == nil { - return 1 - } - return wm.currentSegment.StartLSN + uint64(wm.currentSegment.Size/100) -} - -func (wm *SegmentedWALManager) Write(record *WALRecord) error { - record.Timestamp = time.Now().UnixMilli() - wm.writeChan <- record - return nil -} - -func (wm *SegmentedWALManager) writerLoop() { - defer wm.wg.Done() - batch := make([]*WALRecord, 0, wm.batchSize) - ticker := time.NewTicker(5 * time.Second) - defer ticker.Stop() - - for { - select { - case record, ok := <-wm.writeChan: - if !ok { - wm.flushBatch(batch) - return - } - batch = append(batch, record) - if len(batch) >= wm.batchSize { - wm.flushBatch(batch) - batch = batch[:0] - } - case <-ticker.C: - if len(batch) > 0 { - wm.flushBatch(batch) - batch = batch[:0] - } - case <-wm.stopCh: - wm.flushBatch(batch) - return - } - } -} - -// flushBatch - ИСПРАВЛЕНО: CRC для каждой записи -func (wm *SegmentedWALManager) flushBatch(batch []*WALRecord) { - wm.mu.Lock() - defer wm.mu.Unlock() - - for _, record := range batch { - if wm.currentSegment.Size >= WALSegmentSize { - wm.mu.Unlock() - wm.rotateSegment() - wm.mu.Lock() - } - - data, err := json.Marshal(record) - if err != nil { - continue - } - - lsnBytes := make([]byte, 8) - binary.BigEndian.PutUint64(lsnBytes, record.LSN) - crcData := append(lsnBytes, data...) - record.CRC = crc32(crcData) - - header := make([]byte, 8) - binary.BigEndian.PutUint32(header[0:4], uint32(len(data))) - binary.BigEndian.PutUint32(header[4:8], record.CRC) - - if _, err := wm.currentSegment.Writer.Write(header); err != nil { - continue - } - if _, err := wm.currentSegment.Writer.Write(data); err != nil { - continue - } - - wm.index.addEntry(&WALIndexEntry{ - LSN: record.LSN, - SegmentID: wm.currentSegment.ID, - Offset: wm.currentSegment.Size, - Length: uint32(len(data)), - Checksum: record.CRC, - }) - - wm.currentSegment.Size += int64(8 + len(data)) - wm.currentSegment.EndLSN = record.LSN - } - - wm.currentSegment.Writer.Flush() - if wm.fsyncEnabled { - RealFsyncWithRetry(wm.currentSegment.File, FsyncMaxRetries, FsyncRetryDelay) - } - wm.index.save() -} - -func (wm *SegmentedWALManager) Sync() error { - wm.mu.Lock() - defer wm.mu.Unlock() - if wm.currentSegment == nil { - return nil - } - if err := wm.currentSegment.Writer.Flush(); err != nil { - return err - } - if wm.fsyncEnabled { - return RealFsyncWithRetry(wm.currentSegment.File, FsyncMaxRetries, FsyncRetryDelay) - } - return nil -} - -func (wm *SegmentedWALManager) ReadAll() ([]*WALRecord, error) { - wm.mu.RLock() - segments := make([]*WALSegment, 0, len(wm.segments)) - for _, seg := range wm.segments { - segments = append(segments, seg) - } - wm.mu.RUnlock() - - sort.Slice(segments, func(i, j int) bool { - return segments[i].ID < segments[j].ID - }) - - records := make([]*WALRecord, 0) - for _, seg := range segments { - segRecords, err := wm.readSegmentRecords(seg) - if err != nil { - if wm.logger != nil { - wm.logger.Warn(fmt.Sprintf("Failed to read segment %d: %v", seg.ID, err)) - } - continue - } - records = append(records, segRecords...) - } - return records, nil -} - -func (wm *SegmentedWALManager) ReadSince(lsn uint64) ([]*WALRecord, error) { - allRecords, err := wm.ReadAll() - if err != nil { - return nil, err - } - result := make([]*WALRecord, 0) - for _, record := range allRecords { - if record.LSN > lsn { - result = append(result, record) - } - } - return result, nil -} - -func (wm *SegmentedWALManager) GetCurrentLSN() uint64 { - wm.mu.RLock() - defer wm.mu.RUnlock() - if wm.currentSegment == nil { - return 1 - } - return wm.currentSegment.EndLSN -} - -// readSegmentRecords - ИСПРАВЛЕНО: обработка torn write с CRC -func (wm *SegmentedWALManager) readSegmentRecords(seg *WALSegment) ([]*WALRecord, error) { - seg.mu.Lock() - defer seg.mu.Unlock() - - if seg.File == nil { - return nil, nil - } - - seg.Writer.Flush() - seg.File.Seek(0, 0) - - records := make([]*WALRecord, 0) - reader := bufio.NewReader(seg.File) - headerBuf := make([]byte, 8) - - for { - _, err := io.ReadFull(reader, headerBuf) - if err != nil { - break - } - - recordLen := binary.BigEndian.Uint32(headerBuf[0:4]) - expectedCRC := binary.BigEndian.Uint32(headerBuf[4:8]) - - if recordLen == 0 || recordLen > 100*1024*1024 { - break - } - - recordData := make([]byte, recordLen) - _, err = io.ReadFull(reader, recordData) - if err != nil { - break - } - - var record WALRecord - if err := json.Unmarshal(recordData, &record); err != nil { - continue - } - - lsnBytes := make([]byte, 8) - binary.BigEndian.PutUint64(lsnBytes, record.LSN) - crcData := append(lsnBytes, recordData...) - calculatedCRC := crc32(crcData) - - if calculatedCRC != expectedCRC && calculatedCRC != record.CRC { - continue - } - records = append(records, &record) - } - return records, nil -} - -func (wm *SegmentedWALManager) Close() error { - close(wm.stopCh) - close(wm.writeChan) - wm.wg.Wait() - - wm.mu.Lock() - defer wm.mu.Unlock() - - if wm.currentSegment != nil { - wm.currentSegment.Writer.Flush() - if wm.fsyncEnabled { - RealFsyncWithRetry(wm.currentSegment.File, FsyncMaxRetries, FsyncRetryDelay) - } - wm.currentSegment.File.Close() - } - - wm.index.save() - return nil -} - -func (im *WALIndexManager) addEntry(entry *WALIndexEntry) { - im.mu.Lock() - defer im.mu.Unlock() - im.index[entry.LSN] = entry -} - -func (im *WALIndexManager) save() error { - im.mu.RLock() - defer im.mu.RUnlock() - data, err := json.Marshal(im.index) - if err != nil { - return err - } - return os.WriteFile(im.indexPath, data, 0644) -} - -func (im *WALIndexManager) load() error { - data, err := os.ReadFile(im.indexPath) - if err != nil { - if os.IsNotExist(err) { - return nil - } - return err - } - if len(data) == 0 { - return nil - } - return json.Unmarshal(data, &im.index) -} - -// ============================================================================= -// ASYNC RECOVERY MANAGER -// ============================================================================= - -type AsyncRecoveryManager struct { - recordChan chan *WALRecord - errChan chan error - doneChan chan struct{} - wg sync.WaitGroup - callback func(*WALRecord) error - mu sync.RWMutex - isRunning bool - recoveredCnt atomic.Uint64 - errorCnt atomic.Uint64 - startTime time.Time -} - -func NewAsyncRecoveryManager(callback func(*WALRecord) error, workers int) *AsyncRecoveryManager { - arm := &AsyncRecoveryManager{ - recordChan: make(chan *WALRecord, AsyncRecoveryBufferSize), - errChan: make(chan error, workers), - doneChan: make(chan struct{}), - callback: callback, - startTime: time.Now(), - isRunning: true, - } - - for i := 0; i < workers; i++ { - arm.wg.Add(1) - go arm.worker() - } - go arm.errorMonitor() - return arm -} - -func (arm *AsyncRecoveryManager) worker() { - defer arm.wg.Done() - for record := range arm.recordChan { - var err error - if arm.callback != nil { - err = arm.callback(record) - } - if err != nil { - select { - case arm.errChan <- err: - default: - } - arm.errorCnt.Add(1) - } else { - arm.recoveredCnt.Add(1) - } - } -} - -func (arm *AsyncRecoveryManager) errorMonitor() { - criticalErrors := 0 - for range arm.errChan { - criticalErrors++ - if criticalErrors > 10 { - arm.Stop() - return - } - } -} - -func (arm *AsyncRecoveryManager) Push(record *WALRecord) bool { - arm.mu.RLock() - if !arm.isRunning { - arm.mu.RUnlock() - return false - } - arm.mu.RUnlock() - - select { - case arm.recordChan <- record: - return true - case <-time.After(100 * time.Millisecond): - return false - } -} - -func (arm *AsyncRecoveryManager) Wait() { - close(arm.recordChan) - arm.wg.Wait() - close(arm.doneChan) -} - -func (arm *AsyncRecoveryManager) Stop() { - arm.mu.Lock() - if !arm.isRunning { - arm.mu.Unlock() - return - } - arm.isRunning = false - arm.mu.Unlock() - close(arm.recordChan) -} - -func (arm *AsyncRecoveryManager) GetStats() map[string]interface{} { - return map[string]interface{}{ - "recovered": arm.recoveredCnt.Load(), - "errors": arm.errorCnt.Load(), - "is_running": arm.isRunning, - "elapsed_ms": time.Since(arm.startTime).Milliseconds(), - } -} - -// ============================================================================= -// DEADLOCK DETECTOR -// ============================================================================= - -type DeadlockDetector struct { - waitForGraph sync.Map - checkInterval time.Duration - timeout time.Duration - mu sync.RWMutex - stopChan chan struct{} - wg sync.WaitGroup - logger LoggerInterface -} - -func NewDeadlockDetector(checkInterval, timeout time.Duration) *DeadlockDetector { - if checkInterval <= 0 { - checkInterval = DeadlockCheckInterval - } - if timeout <= 0 { - timeout = DefaultTxTimeout - } - d := &DeadlockDetector{ - checkInterval: checkInterval, - timeout: timeout, - stopChan: make(chan struct{}), - } - d.wg.Add(1) - go d.detectLoop() - return d -} - -func (dd *DeadlockDetector) SetLogger(logger LoggerInterface) { dd.logger = logger } - -func (dd *DeadlockDetector) Stop() { - close(dd.stopChan) - dd.wg.Wait() -} - -func (dd *DeadlockDetector) AddWaiting(waiting, waitingFor TransactionID) { - var list []TransactionID - if val, ok := dd.waitForGraph.Load(waiting); ok { - list = val.([]TransactionID) - } - list = append(list, waitingFor) - dd.waitForGraph.Store(waiting, list) -} - -func (dd *DeadlockDetector) RemoveWaiting(txID TransactionID) { - dd.waitForGraph.Delete(txID) -} - -func (dd *DeadlockDetector) detectLoop() { - defer dd.wg.Done() - ticker := time.NewTicker(dd.checkInterval) - defer ticker.Stop() - - for { - select { - case <-ticker.C: - dd.detect() - case <-dd.stopChan: - return - } - } -} - -func (dd *DeadlockDetector) detect() { - visited := make(map[TransactionID]bool) - stack := make(map[TransactionID]bool) - - var dfs func(txID TransactionID) bool - dfs = func(txID TransactionID) bool { - visited[txID] = true - stack[txID] = true - - val, ok := dd.waitForGraph.Load(txID) - if ok { - for _, next := range val.([]TransactionID) { - if !visited[next] { - if dfs(next) { - return true - } - } else if stack[next] { - dd.resolveDeadlock(txID, next) - return true - } - } - } - stack[txID] = false - return false - } - - dd.waitForGraph.Range(func(key, value interface{}) bool { - txID := key.(TransactionID) - if !visited[txID] { - dfs(txID) - } - return true - }) -} - -func (dd *DeadlockDetector) resolveDeadlock(txID1, txID2 TransactionID) { - if globalTxManager != nil { - if val, ok := globalTxManager.activeTransactions.Load(txID1); ok { - tx := val.(*Transaction) - if tx.IsDistributed { - if dd.logger != nil { - dd.logger.Warn(fmt.Sprintf("Distributed transaction %d involved in deadlock with %d, aborting", txID1, txID2)) - } - AbortDistributedTransaction(txID1) - } else { - tx.State.Store(int32(TransactionAborted)) - globalTxManager.activeTransactions.Delete(txID1) - globalTxManager.stats.TotalDeadlocks.Add(1) - globalTxManager.stats.ActiveCount.Add(^uint64(0)) - if dd.logger != nil { - dd.logger.Warn(fmt.Sprintf("Deadlock resolved: aborted transaction %d due to conflict with %d", txID1, txID2)) - } - } - } - } -} - -// ============================================================================= -// DISTRIBUTED TRANSACTION COORDINATOR -// ============================================================================= - -type TxState int32 - -const ( - TxActive TxState = iota - TxCommitted - TxAborted - TxTimeout -) - -type DistributedTxInfo struct { - TxID TransactionID - Nodes []string - Status TxState - StartTime int64 - Timeout time.Duration -} - -type DistributedTransactionCoordinator struct { - pendingTxs sync.Map - timeout time.Duration - mu sync.RWMutex -} - -func NewDistributedTransactionCoordinator(timeout time.Duration) *DistributedTransactionCoordinator { - if timeout <= 0 { - timeout = 30 * time.Second - } - return &DistributedTransactionCoordinator{timeout: timeout} -} - -func (dtc *DistributedTransactionCoordinator) Prepare(txID TransactionID, nodes []string) error { - info := &DistributedTxInfo{ - TxID: txID, - Nodes: nodes, - Status: TxActive, - StartTime: time.Now().UnixMilli(), - Timeout: dtc.timeout, - } - dtc.pendingTxs.Store(txID, info) - return nil -} - -func (dtc *DistributedTransactionCoordinator) Commit(txID TransactionID) error { - val, ok := dtc.pendingTxs.Load(txID) - if !ok { - return fmt.Errorf("transaction not found: %d", txID) - } - info := val.(*DistributedTxInfo) - info.Status = TxCommitted - return nil -} - -func (dtc *DistributedTransactionCoordinator) Abort(txID TransactionID) error { - dtc.pendingTxs.Delete(txID) - return nil -} - -// ============================================================================= -// Transaction -// ============================================================================= - -type Transaction struct { - ID TransactionID - State atomic.Int32 - Operations []Operation - StartTime int64 - Version uint64 - mu sync.RWMutex - IsDistributed bool - Nodes []string - savepoints []*Savepoint - timeout time.Duration - timeoutTimer *time.Timer -} - -type Savepoint struct { - Name string - Timestamp int64 - OpCount int - Snapshot *Document -} - -type TransactionOptions struct { - Timeout time.Duration - IsDistributed bool - Nodes []string - IsolationLevel string -} - -type TransactionInfo struct { - ID string `json:"id"` - Status string `json:"status"` - StartTime int64 `json:"start_time"` - OperationCount int `json:"operation_count"` - Operations []OperationInfo `json:"operations,omitempty"` - Savepoints []string `json:"savepoints,omitempty"` - Nodes []string `json:"nodes,omitempty"` -} - -type OperationInfo struct { - Type string `json:"type"` - Database string `json:"database"` - Collection string `json:"collection"` - DocumentID string `json:"document_id"` -} - -type TransactionStats struct { - TotalStarted atomic.Uint64 - TotalCommitted atomic.Uint64 - TotalAborted atomic.Uint64 - TotalTimedOut atomic.Uint64 - TotalDeadlocks atomic.Uint64 - ActiveCount atomic.Uint64 - PeakActiveCount atomic.Uint64 - MaxOpsPerTx atomic.Uint64 - AvgOpsPerTx atomic.Uint64 - TotalOps atomic.Uint64 - StartTime time.Time -} - -type TransactionManager struct { - activeTransactions sync.Map - nextTxID atomic.Uint64 - wal *SegmentedWALManager - logger LoggerInterface - mu sync.RWMutex - walPath string - checkpointInterval int64 - lastCheckpoint int64 - checkpointFile *os.File - documentVersions sync.Map - maxVersions int - visibilityMap *VisibilityMap - readCache *ReadTimestampCache - distCoord *DistributedTransactionCoordinator - deadlockDetector *DeadlockDetector - recoveryManager *AsyncRecoveryManager - recoveryComplete atomic.Bool - backupLock sync.RWMutex - backupInProgress atomic.Bool - stats *TransactionStats - mvccManager *MVCCManager -} - -// ============================================================================= -// ГЛОБАЛЬНЫЕ ПЕРЕМЕННЫЕ -// ============================================================================= - -var ( - globalTxManager *TransactionManager - txManagerOnce sync.Once - currentTx atomic.Value - globalStorage *Storage -) - -func InitTransactionManager(walPath string) error { - return InitTransactionManagerWithConfig(walPath, nil) -} - -func InitTransactionManagerWithConfig(walPath string, config map[string]interface{}) error { - var err error - txManagerOnce.Do(func() { - maxVersions := 10 - if config != nil { - if v, ok := config["max_versions"].(int); ok && v > 0 { - maxVersions = v - } - } - - globalTxManager = &TransactionManager{ - nextTxID: atomic.Uint64{}, - walPath: walPath, - checkpointInterval: 300, - lastCheckpoint: time.Now().Unix(), - maxVersions: maxVersions, - visibilityMap: NewVisibilityMap(VisibilityMapSize), - readCache: NewReadTimestampCache(10000, 5*time.Minute), - distCoord: NewDistributedTransactionCoordinator(30 * time.Second), - deadlockDetector: NewDeadlockDetector(DeadlockCheckInterval, DefaultTxTimeout), - stats: &TransactionStats{StartTime: time.Now()}, - mvccManager: NewMVCCManager(MaxVersionsPerDoc, VersionRetentionDays), - } - globalTxManager.nextTxID.Store(1) - - var walErr error - fsyncEnabled := true - if config != nil { - if v, ok := config["fsync_enabled"].(bool); ok { - fsyncEnabled = v - } - } - - globalTxManager.wal, walErr = NewSegmentedWALManager(filepath.Dir(walPath), fsyncEnabled, nil) - if walErr != nil { - err = walErr - return - } - - globalTxManager.startAsyncRecovery() - go globalTxManager.checkpointLoop() - go globalTxManager.versionCleanupLoop() - go globalTxManager.statsMonitor() - }) - return err -} - -func GetTransactionManager() *TransactionManager { return globalTxManager } - -func SetTransactionLogger(logger LoggerInterface) { - if globalTxManager != nil { - globalTxManager.logger = logger - if globalTxManager.wal != nil { - globalTxManager.wal.logger = logger - } - if globalTxManager.deadlockDetector != nil { - globalTxManager.deadlockDetector.SetLogger(logger) - } - } -} - -func SetGlobalStorage(s *Storage) { globalStorage = s } -func GetGlobalStorage() *Storage { return globalStorage } - -func BeginTransaction() *Transaction { - if globalTxManager == nil { - InitTransactionManager("futriis.wal") - } - return BeginTransactionWithOptions(&TransactionOptions{ - Timeout: DefaultTxTimeout, - }) -} - -func BeginTransactionWithOptions(options *TransactionOptions) *Transaction { - if globalTxManager == nil { - InitTransactionManager("futriis.wal") - } - - if options == nil { - options = &TransactionOptions{Timeout: DefaultTxTimeout} - } - - tx := &Transaction{ - ID: TransactionID(globalTxManager.nextTxID.Add(1) - 1), - StartTime: time.Now().UnixMilli(), - Operations: make([]Operation, 0, 100), - Version: 1, - savepoints: make([]*Savepoint, 0), - timeout: options.Timeout, - IsDistributed: options.IsDistributed, - Nodes: options.Nodes, - } - tx.State.Store(int32(TransactionActive)) - - globalTxManager.activeTransactions.Store(tx.ID, tx) - currentTx.Store(tx) - - globalTxManager.stats.TotalStarted.Add(1) - globalTxManager.stats.ActiveCount.Add(1) - - LogTransactionAudit(tx.ID, "START", TransactionActive, map[string]interface{}{ - "start_time": tx.StartTime, - "timeout_ms": options.Timeout.Milliseconds(), - "distributed": options.IsDistributed, - }) - - if options.Timeout > 0 { - tx.timeoutTimer = time.AfterFunc(options.Timeout, func() { - if TransactionState(tx.State.Load()) == TransactionActive { - tx.State.Store(int32(TransactionAborted)) - globalTxManager.activeTransactions.Delete(tx.ID) - globalTxManager.stats.TotalTimedOut.Add(1) - globalTxManager.stats.ActiveCount.Add(^uint64(0)) - LogTransactionAudit(tx.ID, "TIMEOUT", TransactionAborted, map[string]interface{}{ - "timeout_ms": options.Timeout.Milliseconds(), - }) - } - }) - } - return tx -} - -func BeginTransactionWithTimeout(timeout time.Duration) *Transaction { - return BeginTransactionWithOptions(&TransactionOptions{Timeout: timeout}) -} - -func BeginDistributedTransaction(nodes []string) (*Transaction, error) { - if globalTxManager == nil { - if err := InitTransactionManager("futriis.wal"); err != nil { - return nil, err - } - } - - options := &TransactionOptions{ - Timeout: 30 * time.Second, - IsDistributed: true, - Nodes: nodes, - IsolationLevel: "READ_COMMITTED", - } - - tx := BeginTransactionWithOptions(options) - if tx == nil { - return nil, fmt.Errorf("failed to create transaction") - } - - if err := globalTxManager.distCoord.Prepare(tx.ID, nodes); err != nil { - return nil, err - } - - if globalTxManager.logger != nil { - globalTxManager.logger.Info(fmt.Sprintf("Distributed transaction %d started on nodes: %v", tx.ID, nodes)) - } - return tx, nil -} - -func CommitCurrentTransaction() error { - txVal := currentTx.Load() - if txVal == nil { - return fmt.Errorf("no active transaction") - } - - tx := txVal.(*Transaction) - if TransactionState(tx.State.Load()) != TransactionActive { - return fmt.Errorf("transaction is not active") - } - - if tx.IsDistributed { - return fmt.Errorf("distributed transaction must use CommitDistributedTransaction") - } - - if tx.timeout > 0 && time.Since(time.UnixMilli(tx.StartTime)) > tx.timeout { - AbortCurrentTransaction() - return fmt.Errorf("transaction timeout exceeded") - } - - for _, op := range tx.Operations { - if err := applyOperation(op); err != nil { - AbortCurrentTransaction() - return fmt.Errorf("transaction commit failed at operation %s: %v", op.Type, err) - } - if globalTxManager != nil && op.DocumentID != "" { - if globalStorage != nil { - db, _ := globalStorage.GetDatabase(op.Database) - if db != nil { - coll, _ := db.GetCollection(op.Collection) - if coll != nil { - if doc, err := coll.Find(op.DocumentID); err == nil { - if globalTxManager.mvccManager != nil { - globalTxManager.mvccManager.CreateVersion(doc, tx.ID) - } - globalTxManager.AddDocumentVersion(op.DocumentID, &DocumentVersion{ - Document: doc.Clone(), - Timestamp: time.Now().UnixMilli(), - TxID: tx.ID, - }) - } - } - } - } - } - } - - tx.State.Store(int32(TransactionCommitted)) - - txRecord := &TransactionRecord{ - ID: tx.ID, - State: TransactionCommitted, - Timestamp: time.Now().UnixMilli(), - Operations: tx.Operations, - } - - data, err := json.Marshal(txRecord) - if err == nil { - walRecord := &WALRecord{Type: 1, Data: data} - globalTxManager.wal.Write(walRecord) - globalTxManager.wal.Sync() - } - - LogTransactionAudit(tx.ID, "COMMIT", TransactionCommitted, map[string]interface{}{ - "operations": len(tx.Operations), - }) - - globalTxManager.stats.TotalCommitted.Add(1) - globalTxManager.stats.ActiveCount.Add(^uint64(0)) - globalTxManager.stats.TotalOps.Add(uint64(len(tx.Operations))) - if uint64(len(tx.Operations)) > globalTxManager.stats.MaxOpsPerTx.Load() { - globalTxManager.stats.MaxOpsPerTx.Store(uint64(len(tx.Operations))) - } - - if tx.timeoutTimer != nil { - tx.timeoutTimer.Stop() - } - - currentTx.Store(nil) - globalTxManager.activeTransactions.Delete(tx.ID) - return nil -} - -func AbortCurrentTransaction() error { - txVal := currentTx.Load() - if txVal == nil { - return fmt.Errorf("no active transaction") - } - - tx := txVal.(*Transaction) - tx.State.Store(int32(TransactionAborted)) - - LogTransactionAudit(tx.ID, "ABORT", TransactionAborted, map[string]interface{}{ - "operations": len(tx.Operations), - }) - - globalTxManager.stats.TotalAborted.Add(1) - globalTxManager.stats.ActiveCount.Add(^uint64(0)) - - if tx.timeoutTimer != nil { - tx.timeoutTimer.Stop() - } - - currentTx.Store(nil) - globalTxManager.activeTransactions.Delete(tx.ID) - return nil -} - -func CommitDistributedTransaction(txID TransactionID) error { - if globalTxManager == nil { - return fmt.Errorf("transaction manager not initialized") - } - - val, ok := globalTxManager.activeTransactions.Load(txID) - if !ok { - return fmt.Errorf("transaction not found: %d", txID) - } - - tx := val.(*Transaction) - if TransactionState(tx.State.Load()) != TransactionActive { - return fmt.Errorf("transaction is not active") - } - - if err := globalTxManager.distCoord.Commit(txID); err != nil { - return err - } - - for _, op := range tx.Operations { - if err := applyOperation(op); err != nil { - return fmt.Errorf("failed to apply operation: %v", err) - } - } - - tx.State.Store(int32(TransactionCommitted)) - globalTxManager.activeTransactions.Delete(txID) - globalTxManager.stats.TotalCommitted.Add(1) - globalTxManager.stats.ActiveCount.Add(^uint64(0)) - - if tx.timeoutTimer != nil { - tx.timeoutTimer.Stop() - } - - LogTransactionAudit(txID, "COMMIT_DISTRIBUTED", TransactionCommitted, map[string]interface{}{ - "nodes": tx.Nodes, - }) - return nil -} - -func AbortDistributedTransaction(txID TransactionID) error { - if globalTxManager == nil { - return fmt.Errorf("transaction manager not initialized") - } - - val, ok := globalTxManager.activeTransactions.Load(txID) - if !ok { - return fmt.Errorf("transaction not found: %d", txID) - } - - tx := val.(*Transaction) - - if err := globalTxManager.distCoord.Abort(txID); err != nil { - return err - } - - tx.State.Store(int32(TransactionAborted)) - globalTxManager.activeTransactions.Delete(txID) - globalTxManager.stats.TotalAborted.Add(1) - globalTxManager.stats.ActiveCount.Add(^uint64(0)) - - if tx.timeoutTimer != nil { - tx.timeoutTimer.Stop() - } - - LogTransactionAudit(txID, "ABORT_DISTRIBUTED", TransactionAborted, map[string]interface{}{ - "nodes": tx.Nodes, - }) - return nil -} - -func applyOperation(op Operation) error { - if globalStorage == nil { - return fmt.Errorf("storage not initialized") - } - - db, err := globalStorage.GetDatabase(op.Database) - if err != nil { - return fmt.Errorf("database not found: %s", op.Database) - } - - coll, err := db.GetCollection(op.Collection) - if err != nil { - return fmt.Errorf("collection not found: %s", op.Collection) - } - - switch op.Type { - case "insert": - doc := NewDocumentWithID(op.DocumentID) - for k, v := range op.Data { - doc.SetField(k, v) - } - doc.Version = op.Version - if globalTxManager != nil && globalTxManager.mvccManager != nil { - globalTxManager.mvccManager.CreateVersion(doc, 0) - } - return coll.Insert(doc) - - case "update": - if err := coll.Update(op.DocumentID, op.Data); err != nil { - return err - } - if globalTxManager != nil && globalTxManager.mvccManager != nil { - if doc, err := coll.Find(op.DocumentID); err == nil { - globalTxManager.mvccManager.CreateVersion(doc, 0) - } - } - return nil - - case "delete": - return coll.Delete(op.DocumentID) - } - return nil -} - -func (tx *Transaction) CreateSavepoint(name string) error { - if TransactionState(tx.State.Load()) != TransactionActive { - return fmt.Errorf("transaction is not active") - } - - if len(tx.savepoints) >= MaxSavepointsPerTx { - return fmt.Errorf("too many savepoints (max %d)", MaxSavepointsPerTx) - } - - for _, sp := range tx.savepoints { - if sp.Name == name { - return fmt.Errorf("savepoint '%s' already exists", name) - } - } - - savepoint := &Savepoint{ - Name: name, - Timestamp: time.Now().UnixMilli(), - OpCount: len(tx.Operations), - } - - if len(tx.Operations) > 0 { - lastOp := tx.Operations[len(tx.Operations)-1] - if lastOp.DocumentID != "" && globalStorage != nil { - db, _ := globalStorage.GetDatabase(lastOp.Database) - if db != nil { - coll, _ := db.GetCollection(lastOp.Collection) - if coll != nil { - if doc, err := coll.Find(lastOp.DocumentID); err == nil { - savepoint.Snapshot = doc.Clone() - } - } - } - } - } - - tx.mu.Lock() - tx.savepoints = append(tx.savepoints, savepoint) - tx.mu.Unlock() - - LogTransactionAudit(tx.ID, "SAVEPOINT", TransactionActive, map[string]interface{}{ - "savepoint": name, - "op_count": savepoint.OpCount, - }) - return nil -} - -func (tx *Transaction) RollbackToSavepoint(name string) error { - if TransactionState(tx.State.Load()) != TransactionActive { - return fmt.Errorf("transaction is not active") - } - - tx.mu.Lock() - defer tx.mu.Unlock() - - var targetIdx int = -1 - for i, sp := range tx.savepoints { - if sp.Name == name { - targetIdx = i - break - } - } - - if targetIdx == -1 { - return fmt.Errorf("savepoint '%s' not found", name) - } - - if len(tx.Operations) > tx.savepoints[targetIdx].OpCount { - tx.Operations = tx.Operations[:tx.savepoints[targetIdx].OpCount] - } - tx.savepoints = tx.savepoints[:targetIdx+1] - - LogTransactionAudit(tx.ID, "ROLLBACK_TO_SAVEPOINT", TransactionActive, map[string]interface{}{ - "savepoint": name, - }) - return nil -} - -func (tx *Transaction) ReleaseSavepoint(name string) error { - tx.mu.Lock() - defer tx.mu.Unlock() - - for i, sp := range tx.savepoints { - if sp.Name == name { - tx.savepoints = append(tx.savepoints[:i], tx.savepoints[i+1:]...) - LogTransactionAudit(tx.ID, "RELEASE_SAVEPOINT", TransactionActive, map[string]interface{}{ - "savepoint": name, - }) - return nil - } - } - return fmt.Errorf("savepoint '%s' not found", name) -} - -func (tx *Transaction) GetSavepoints() []string { - tx.mu.RLock() - defer tx.mu.RUnlock() - - names := make([]string, len(tx.savepoints)) - for i, sp := range tx.savepoints { - names[i] = sp.Name - } - return names -} - -func (tm *TransactionManager) AddDocumentVersion(docID string, version *DocumentVersion) { - val, _ := tm.documentVersions.LoadOrStore(docID, make([]*DocumentVersion, 0)) - versions := val.([]*DocumentVersion) - versions = append(versions, version) - - if len(versions) > tm.maxVersions && tm.maxVersions > 0 { - versions = versions[len(versions)-tm.maxVersions:] - } - tm.documentVersions.Store(docID, versions) - - if tm.visibilityMap != nil { - tm.visibilityMap.MarkVisible(docID, uint64(version.TxID), true) - } -} - -func (tm *TransactionManager) GetDocumentVersion(docID string, timestamp int64) *Document { - if tm.readCache != nil { - if cached := tm.readCache.Get(docID, timestamp); cached != nil { - return cached - } - } - - val, ok := tm.documentVersions.Load(docID) - if !ok { - return nil - } - - versions := val.([]*DocumentVersion) - for i := len(versions) - 1; i >= 0; i-- { - if versions[i].Timestamp <= timestamp { - doc := versions[i].Document.Clone() - if tm.readCache != nil { - tm.readCache.Set(docID, timestamp, doc) - } - return doc - } - } - return nil -} - -func (tm *TransactionManager) checkpointLoop() { - ticker := time.NewTicker(time.Duration(tm.checkpointInterval) * time.Second) - defer ticker.Stop() - for range ticker.C { - tm.createCheckpoint() - } -} - -func (tm *TransactionManager) createCheckpoint() { - if tm.wal == nil { - return - } - - now := time.Now().Unix() - if now-tm.lastCheckpoint < tm.checkpointInterval { - return - } - - checkpointPath := fmt.Sprintf("%s.checkpoint.%d", tm.walPath, now) - - checkpoint := make(map[string]interface{}) - checkpoint["timestamp"] = now - checkpoint["backup_lsn"] = tm.wal.GetBackupLSN() - - data, err := json.Marshal(checkpoint) - if err != nil { - if tm.logger != nil { - tm.logger.Error(fmt.Sprintf("Failed to marshal checkpoint: %v", err)) - } - return - } - - if err := os.WriteFile(checkpointPath, data, 0644); err != nil { - if tm.logger != nil { - tm.logger.Error(fmt.Sprintf("Failed to write checkpoint: %v", err)) - } - return - } - - tm.lastCheckpoint = now - if tm.logger != nil { - tm.logger.Info(fmt.Sprintf("Checkpoint created: %s", checkpointPath)) - } -} - -func (tm *TransactionManager) versionCleanupLoop() { - if tm.maxVersions <= 0 { - return - } - - ticker := time.NewTicker(VersionPruneInterval) - defer ticker.Stop() - - for range ticker.C { - cutoffTime := time.Now().AddDate(0, 0, -VersionRetentionDays).UnixMilli() - - tm.documentVersions.Range(func(key, value interface{}) bool { - versions := value.([]*DocumentVersion) - if len(versions) <= tm.maxVersions { - return true - } - - newVersions := make([]*DocumentVersion, 0, tm.maxVersions) - for _, v := range versions { - if v.Timestamp >= cutoffTime && len(newVersions) < tm.maxVersions { - newVersions = append(newVersions, v) - } - } - - if len(newVersions) < len(versions) { - tm.documentVersions.Store(key, newVersions) - } - return true - }) - } -} - -func (tm *TransactionManager) statsMonitor() { - ticker := time.NewTicker(10 * time.Second) - defer ticker.Stop() - - for range ticker.C { - active := tm.stats.ActiveCount.Load() - if active > tm.stats.PeakActiveCount.Load() { - tm.stats.PeakActiveCount.Store(active) - } - } -} - -func (tm *TransactionManager) startAsyncRecovery() { - if tm.wal == nil { - tm.recoveryComplete.Store(true) - return - } - - if tm.logger != nil { - tm.logger.Info("Starting asynchronous WAL recovery...") - } - - records, err := tm.wal.ReadAll() - if err != nil { - if tm.logger != nil { - tm.logger.Error(fmt.Sprintf("Failed to read WAL: %v", err)) - } - tm.recoveryComplete.Store(true) - return - } - - if len(records) == 0 { - if tm.logger != nil { - tm.logger.Info("No records to recover") - } - tm.recoveryComplete.Store(true) - return - } - - tm.recoveryManager = NewAsyncRecoveryManager(func(record *WALRecord) error { - if record.Type == 1 { - var txRecord TransactionRecord - if err := json.Unmarshal(record.Data, &txRecord); err != nil { - return err - } - if txRecord.State == TransactionCommitted { - for _, op := range txRecord.Operations { - if err := applyOperation(op); err != nil { - return err - } - } - } - } - return nil - }, AsyncRecoveryWorkers) - - for _, record := range records { - if !tm.recoveryManager.Push(record) { - if tm.logger != nil { - tm.logger.Warn("Recovery buffer full, some records may be delayed") - } - } - } - - go func() { - ticker := time.NewTicker(5 * time.Second) - defer ticker.Stop() - - for { - select { - case <-ticker.C: - stats := tm.recoveryManager.GetStats() - if tm.logger != nil { - tm.logger.Debug(fmt.Sprintf("Recovery progress: %d records recovered", stats["recovered"])) - } - case <-tm.recoveryManager.doneChan: - stats := tm.recoveryManager.GetStats() - if tm.logger != nil { - tm.logger.Info(fmt.Sprintf("WAL recovery completed: %d records recovered, %d errors", - stats["recovered"], stats["errors"])) - } - tm.recoveryComplete.Store(true) - return - } - } - }() -} - -func (tm *TransactionManager) IsRecoveryComplete() bool { return tm.recoveryComplete.Load() } - -func (tm *TransactionManager) GetRecoveryProgress() map[string]interface{} { - if tm.recoveryManager == nil { - return map[string]interface{}{ - "is_recovering": false, - "recovered": 0, - "complete": true, - } - } - stats := tm.recoveryManager.GetStats() - return map[string]interface{}{ - "is_recovering": !tm.recoveryComplete.Load(), - "recovered": stats["recovered"], - "complete": tm.recoveryComplete.Load(), - "elapsed_ms": stats["elapsed_ms"], - } -} - -func (tm *TransactionManager) LockForBackup() { - tm.backupLock.Lock() - tm.backupInProgress.Store(true) -} - -func (tm *TransactionManager) UnlockForBackup() { - tm.backupInProgress.Store(false) - tm.backupLock.Unlock() -} - -func (tm *TransactionManager) IsBackupInProgress() bool { return tm.backupInProgress.Load() } - -func GetTransactionStats() map[string]interface{} { - if globalTxManager == nil { - return map[string]interface{}{"error": "transaction manager not initialized"} - } - - stats := globalTxManager.stats - active := stats.ActiveCount.Load() - totalStarted := stats.TotalStarted.Load() - totalCommitted := stats.TotalCommitted.Load() - totalAborted := stats.TotalAborted.Load() - - return map[string]interface{}{ - "total_started": totalStarted, - "total_committed": totalCommitted, - "total_aborted": totalAborted, - "total_timed_out": stats.TotalTimedOut.Load(), - "total_deadlocks": stats.TotalDeadlocks.Load(), - "active_count": active, - "peak_active_count": stats.PeakActiveCount.Load(), - "max_ops_per_tx": stats.MaxOpsPerTx.Load(), - "avg_ops_per_tx": stats.AvgOpsPerTx.Load(), - "total_ops": stats.TotalOps.Load(), - "commit_rate": float64(totalCommitted) / float64(totalStarted+1) * 100, - "abort_rate": float64(totalAborted) / float64(totalStarted+1) * 100, - "uptime_seconds": time.Since(stats.StartTime).Seconds(), - "is_recovery_complete": globalTxManager.IsRecoveryComplete(), - "backup_in_progress": globalTxManager.IsBackupInProgress(), - } -} - -func StopTransactionManager() error { - if globalTxManager == nil { - return nil - } - - if globalTxManager.deadlockDetector != nil { - globalTxManager.deadlockDetector.Stop() - } - - if globalTxManager.wal != nil { - globalTxManager.wal.Sync() - return globalTxManager.wal.Close() - } - return nil -} - -func HasActiveTransaction() bool { return currentTx.Load() != nil } - -func GetCurrentTransactionID() string { - txVal := currentTx.Load() - if txVal == nil { - return "" - } - tx := txVal.(*Transaction) - return fmt.Sprintf("%d", tx.ID) -} - -func GetActiveTransactions() []TransactionInfo { - if globalTxManager == nil { - return []TransactionInfo{} - } - - transactions := make([]TransactionInfo, 0) - - globalTxManager.activeTransactions.Range(func(key, value interface{}) bool { - tx := value.(*Transaction) - status := "active" - state := TransactionState(tx.State.Load()) - switch state { - case TransactionCommitted: - status = "committed" - case TransactionAborted: - status = "aborted" - } - - tx.mu.RLock() - opCount := len(tx.Operations) - operations := make([]OperationInfo, 0, opCount) - for _, op := range tx.Operations { - operations = append(operations, OperationInfo{ - Type: op.Type, - Database: op.Database, - Collection: op.Collection, - DocumentID: op.DocumentID, - }) - } - savepoints := tx.GetSavepoints() - tx.mu.RUnlock() - - info := TransactionInfo{ - ID: fmt.Sprintf("%d", tx.ID), - Status: status, - StartTime: tx.StartTime, - OperationCount: opCount, - Operations: operations, - Savepoints: savepoints, - } - if tx.IsDistributed { - info.Status = "distributed_" + status - info.Nodes = tx.Nodes - } - transactions = append(transactions, info) - return true - }) - return transactions -} - -func GetTransactionByID(id string) (*Transaction, error) { - if globalTxManager == nil { - return nil, fmt.Errorf("transaction manager not initialized") - } - - var txID TransactionID - fmt.Sscanf(id, "%d", &txID) - - if val, ok := globalTxManager.activeTransactions.Load(txID); ok { - return val.(*Transaction), nil - } - return nil, fmt.Errorf("transaction not found") -} - -func AddToTransaction(coll *Collection, opType string, doc *Document) error { - txVal := currentTx.Load() - if txVal == nil { - return fmt.Errorf("no active transaction") - } - - tx := txVal.(*Transaction) - if TransactionState(tx.State.Load()) != TransactionActive { - return fmt.Errorf("transaction is not active") - } - - op := Operation{ - Type: opType, - Database: coll.dbName, - Collection: coll.name, - DocumentID: doc.ID, - Data: doc.GetFields(), - Version: doc.Version, - } - - tx.mu.Lock() - tx.Operations = append(tx.Operations, op) - tx.mu.Unlock() - - LogTransactionAudit(tx.ID, "ADD_OPERATION", TransactionActive, map[string]interface{}{ - "operation": opType, - "document": doc.ID, - }) - return nil -} - -func FindInTransaction(coll *Collection, id string) (*Document, error) { - txVal := currentTx.Load() - if txVal == nil { - return coll.Find(id) - } - - tx := txVal.(*Transaction) - tx.mu.RLock() - defer tx.mu.RUnlock() - - for i := len(tx.Operations) - 1; i >= 0; i-- { - op := tx.Operations[i] - if op.DocumentID == id { - if op.Type == "delete" { - return nil, fmt.Errorf("document deleted in transaction") - } - if op.Type == "insert" || op.Type == "update" { - doc := NewDocumentWithID(op.DocumentID) - for k, v := range op.Data { - doc.SetField(k, v) - } - doc.Version = op.Version - return doc, nil - } - } - } - - if globalTxManager != nil { - if versionDoc := globalTxManager.GetDocumentVersion(id, tx.StartTime); versionDoc != nil { - return versionDoc, nil - } - } - return coll.Find(id) -} - -func MVCCSnapshot() uint64 { return uint64(time.Now().UnixNano()) } - -func CreateDocumentVersion(doc *Document, txID TransactionID) *DocumentVersion { - return &DocumentVersion{ - Document: doc.Clone(), - Timestamp: time.Now().UnixMilli(), - TxID: txID, - } -} - -func BeginTransactionOnCollection(coll *Collection) error { - if globalTxManager == nil { - if err := InitTransactionManager("futriis.wal"); err != nil { - return err - } - } - - tx := BeginTransaction() - if tx == nil { - return fmt.Errorf("failed to create transaction") - } - - if globalTxManager.logger != nil { - globalTxManager.logger.Debug(fmt.Sprintf("Transaction %d started on collection %s.%s", tx.ID, coll.dbName, coll.name)) - } - return nil -} - -func CheckTransactionTimeout(txID TransactionID) error { - if globalTxManager == nil { - return fmt.Errorf("transaction manager not initialized") - } - - val, ok := globalTxManager.activeTransactions.Load(txID) - if !ok { - return fmt.Errorf("transaction not found: %d", txID) - } - - tx := val.(*Transaction) - if TransactionState(tx.State.Load()) != TransactionActive { - return nil - } - - if tx.timeout > 0 && time.Since(time.UnixMilli(tx.StartTime)) > tx.timeout { - tx.State.Store(int32(TransactionAborted)) - globalTxManager.activeTransactions.Delete(tx.ID) - globalTxManager.stats.TotalTimedOut.Add(1) - globalTxManager.stats.ActiveCount.Add(^uint64(0)) - - if tx.timeoutTimer != nil { - tx.timeoutTimer.Stop() - } - - LogTransactionAudit(txID, "TIMEOUT_CHECK", TransactionAborted, map[string]interface{}{ - "timeout_ms": tx.timeout.Milliseconds(), - "elapsed_ms": time.Since(time.UnixMilli(tx.StartTime)).Milliseconds(), - }) - return fmt.Errorf("transaction %d timed out", txID) - } - return nil -} - -// ============================================================================= -// ФУНКЦИИ МИГРАЦИИ -// ============================================================================= - -func GetDocumentAtTimestamp(docID string, timestamp int64) (*Document, error) { - if globalTxManager == nil { - return nil, fmt.Errorf("transaction manager not initialized") - } - doc := globalTxManager.GetDocumentVersion(docID, timestamp) - if doc == nil { - return nil, fmt.Errorf("document %s not found at timestamp %d", docID, timestamp) - } - return doc, nil -} - -func GetDocumentVersionsSince(docID string, since int64) ([]*DocumentVersion, error) { - if globalTxManager == nil { - return nil, fmt.Errorf("transaction manager not initialized") - } - - val, ok := globalTxManager.documentVersions.Load(docID) - if !ok { - return nil, fmt.Errorf("no versions found for document %s", docID) - } - - versions := val.([]*DocumentVersion) - result := make([]*DocumentVersion, 0) - for _, v := range versions { - if v.Timestamp > since { - result = append(result, v) - } - } - return result, nil -} - -func CreateSnapshot(database, collection string) (map[string][]*DocumentVersion, error) { - if globalStorage == nil { - return nil, fmt.Errorf("storage not initialized") - } - - db, err := globalStorage.GetDatabase(database) - if err != nil { - return nil, err - } - - coll, err := db.GetCollection(collection) - if err != nil { - return nil, err - } - - docs := coll.GetAllDocuments() - result := make(map[string][]*DocumentVersion) - - for _, doc := range docs { - versions, err := GetDocumentVersionsSince(doc.ID, 0) - if err != nil { - continue - } - if len(versions) > 0 { - result[doc.ID] = versions - } else if globalTxManager != nil { - version := &DocumentVersion{ - Document: doc.Clone(), - Timestamp: time.Now().UnixMilli(), - TxID: TransactionID(0), - VersionID: fmt.Sprintf("%s_%d", doc.ID, time.Now().UnixNano()), - } - globalTxManager.AddDocumentVersion(doc.ID, version) - result[doc.ID] = []*DocumentVersion{version} - } - } - return result, nil -} - -func ApplySnapshot(database, collection string, snapshot map[string][]*DocumentVersion) error { - if globalStorage == nil { - return fmt.Errorf("storage not initialized") - } - - db, err := globalStorage.GetDatabase(database) - if err != nil { - return err - } - - coll, err := db.GetCollection(collection) - if err != nil { - return err - } - - for docID, versions := range snapshot { - if len(versions) == 0 { - continue - } - - latest := versions[len(versions)-1] - doc := latest.Document - - existing, err := coll.Find(docID) - if err == nil && existing != nil { - updates := doc.GetFields() - if err := coll.Update(docID, updates); err != nil { - return fmt.Errorf("failed to update document %s: %v", docID, err) - } - } else { - if err := coll.Insert(doc); err != nil { - return fmt.Errorf("failed to insert document %s: %v", docID, err) - } - } - - if globalTxManager != nil { - for _, v := range versions { - globalTxManager.AddDocumentVersion(docID, v) - } - } - } - return nil -} - -func GetMVCCManager() *MVCCManager { - if globalTxManager == nil { - return nil - } - return globalTxManager.mvccManager -} - -func GetMVCCStats() map[string]interface{} { - if globalTxManager == nil || globalTxManager.mvccManager == nil { - return map[string]interface{}{"error": "MVCC manager not initialized"} - } - return globalTxManager.mvccManager.GetMVCCStats() -} - -func GetVisibilityMapStats() map[string]interface{} { - if globalTxManager == nil || globalTxManager.visibilityMap == nil { - return map[string]interface{}{"error": "Visibility map not initialized"} - } - return globalTxManager.visibilityMap.GetStats() -} - -func GetReadCacheStats() map[string]interface{} { - if globalTxManager == nil || globalTxManager.readCache == nil { - return map[string]interface{}{"error": "Read cache not initialized"} - } - return globalTxManager.readCache.GetStats() -} - -// ============================================================================= -// ВСПОМОГАТЕЛЬНЫЕ ФУНКЦИИ -// ============================================================================= - -func maxUint64(a, b uint64) uint64 { - if a > b { - return a - } - return b -} \ No newline at end of file