diff --git a/internal/storage/transaction.go b/internal/storage/transaction.go deleted file mode 100644 index 604016d..0000000 --- a/internal/storage/transaction.go +++ /dev/null @@ -1,2265 +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/transaction.go -// Назначение: Реализация транзакций с поддержкой MVCC (Multi-Version Concurrency Control) и WAL (Write-Ahead Log) без блокировок, использующее атомарные операции и версионирование. -// ОПТИМИЗИРОВАНО: пакетная запись WAL, буферизация, асинхронная обработка. -// УЛУЧШЕНИЯ: Segmented WAL, Parallel Recovery, Visibility Map, Version Pruning, -// Distributed Transactions, Deadlock Detection, Transaction Timeout, Savepoints, -// Асинхронное восстановление WAL, реальный fsync. - - -package storage - -import ( - "bufio" - "encoding/binary" - "encoding/json" - "fmt" - "os" - "path/filepath" - "sort" - "sync" - "sync/atomic" - "time" -) - -// ========== Базовые типы ========== - -type TransactionID uint64 - -type TransactionState int32 - -const ( - TransactionActive TransactionState = iota - TransactionCommitted - TransactionAborted - TransactionPrepared // ДОБАВЛЕНО: состояние для 2PC -) - -// TransactionRecord представляет запись 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"` // ДОБАВЛЕНО - Nodes []string `json:"nodes,omitempty"` // ДОБАВЛЕНО -} - -// WALRecord представляет запись в WAL файле -type WALRecord struct { - CRC uint32 `json:"crc"` - Length uint32 `json:"length"` - Type byte `json:"type"` // 1=Transaction, 2=Checkpoint, 3=2PC_Prepare, 4=2PC_Commit, 5=2PC_Abort - Data []byte `json:"data"` - Timestamp int64 `json:"timestamp"` - LSN uint64 `json:"lsn"` -} - -// ========== Константы ========== - -const ( - WALSegmentSize = 64 * 1024 * 1024 - WALSegmentPrefix = "wal_segment_" - WALIndexPrefix = "wal_index_" - - VisibilityMapSize = 1024 * 1024 - VersionPruneInterval = 5 * time.Minute - MaxVersionsPerDoc = 100 - VersionRetentionDays = 7 - - DefaultTxTimeout = 30 * time.Second - DeadlockCheckInterval = 1 * time.Second - MaxSavepointsPerTx = 100 - - TwoPhaseCommitTimeout = 10 * time.Second - - AsyncRecoveryBufferSize = 10000 - AsyncRecoveryWorkers = 4 - AsyncRecoveryTimeout = 30 * time.Second - - FsyncMaxRetries = 3 - FsyncRetryDelay = 100 * time.Millisecond -) - -// ========== CRC32 ========== - -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, 0x37d83bf0, 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 -} - -// ========== WALManager ========== - -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 -} - -func NewWALManager(path string) (*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, - } - - 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 - } - } -} - -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 - } - - lenBuf := make([]byte, 4) - binary.BigEndian.PutUint32(lenBuf, uint32(len(data))) - if _, err := wm.writer.Write(lenBuf); err != nil { - continue - } - - if _, err := wm.writer.Write(data); 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 err := RealFsyncWithRetry(wm.file, FsyncMaxRetries, FsyncRetryDelay); err == nil { - 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) 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) - lenBuf := make([]byte, 4) - - for { - _, err := reader.Read(lenBuf) - if err != nil { - break - } - - recordLen := binary.BigEndian.Uint32(lenBuf) - recordData := make([]byte, recordLen) - _, err = reader.Read(recordData) - if err != nil { - break - } - - var record WALRecord - if err := json.Unmarshal(recordData, &record); err != nil { - continue - } - - data, _ := json.Marshal(record.Data) - if crc32(data) != 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 - } - RealFsync(wm.file) - return wm.file.Close() -} - -// ========== Segmented WAL Manager ========== - -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 - stopChan chan struct{} - wg sync.WaitGroup - batchSize int - logger LoggerInterface - recoveryManager *AsyncRecoveryManager - recoveryComplete atomic.Bool - // ДОБАВЛЕНО: для синхронизации с бэкапами - backupLSN atomic.Uint64 - prepareLSN atomic.Uint64 -} - -func NewSegmentedWALManager(segmentsDir string, 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), - stopChan: make(chan struct{}), - batchSize: 100, - logger: logger, - } - - 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)) - } - } - - if wm.currentSegment == nil { - if err := wm.rotateSegment(); err != nil { - return nil, err - } - } - - wm.wg.Add(1) - go wm.writerLoop() - - return wm, nil -} - -// ДОБАВЛЕНО: Получение LSN для бэкапа -func (wm *SegmentedWALManager) GetBackupLSN() uint64 { - return wm.backupLSN.Load() -} - -// ДОБАВЛЕНО: Установка LSN после бэкапа -func (wm *SegmentedWALManager) SetBackupLSN(lsn uint64) { - wm.backupLSN.Store(lsn) -} - -// ДОБАВЛЕНО: Получение LSN для Prepared транзакций -func (wm *SegmentedWALManager) GetPrepareLSN() uint64 { - return wm.prepareLSN.Load() -} - -// ДОБАВЛЕНО: Установка LSN для Prepared транзакций -func (wm *SegmentedWALManager) SetPrepareLSN(lsn uint64) { - wm.prepareLSN.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 -} - -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(), - } - - if wm.currentSegment != nil { - wm.currentSegment.Writer.Flush() - RealFsync(wm.currentSegment.File) - wm.currentSegment.File.Close() - } - - 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.stopChan: - wm.flushBatch(batch) - return - } - } -} - -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) - - lenBuf := make([]byte, 4) - binary.BigEndian.PutUint32(lenBuf, uint32(len(data))) - if _, err := wm.currentSegment.Writer.Write(lenBuf); 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(4 + len(data)) - wm.currentSegment.EndLSN = record.LSN - } - - wm.currentSegment.Writer.Flush() - RealFsync(wm.currentSegment.File) - wm.index.save() -} - -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 { - return nil, err - } - records = append(records, segRecords...) - } - - return records, nil -} - -// ДОБАВЛЕНО: Чтение записей с определённого LSN -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 -} - -// ДОБАВЛЕНО: Получение текущего LSN -func (wm *SegmentedWALManager) GetCurrentLSN() uint64 { - wm.mu.RLock() - defer wm.mu.RUnlock() - if wm.currentSegment == nil { - return 1 - } - return wm.currentSegment.EndLSN -} - -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) - lenBuf := make([]byte, 4) - - for { - _, err := reader.Read(lenBuf) - if err != nil { - break - } - - recordLen := binary.BigEndian.Uint32(lenBuf) - recordData := make([]byte, recordLen) - _, err = reader.Read(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...) - if crc32(crcData) != record.CRC { - continue - } - - records = append(records, &record) - } - - return records, nil -} - -func (wm *SegmentedWALManager) Close() error { - close(wm.stopChan) - close(wm.writeChan) - wm.wg.Wait() - - wm.mu.Lock() - defer wm.mu.Unlock() - - if wm.currentSegment != nil { - wm.currentSegment.Writer.Flush() - 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) FindByLSN(lsn uint64) *WALIndexEntry { - im.mu.RLock() - defer im.mu.RUnlock() - return im.index[lsn] -} - -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 - } - 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 - // ДОБАВЛЕНО: поддержка 2PC - pending2PC map[TransactionID]*TransactionRecord - mu2PC sync.RWMutex -} - -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, - pending2PC: make(map[TransactionID]*TransactionRecord), - } - - for i := 0; i < workers; i++ { - arm.wg.Add(1) - go arm.worker() - } - - go arm.errorMonitor() - - return arm -} - -// ДОБАВЛЕНО: Обработка 2PC записей -func (arm *AsyncRecoveryManager) handle2PC(record *WALRecord) error { - var txRecord TransactionRecord - if err := json.Unmarshal(record.Data, &txRecord); err != nil { - return err - } - - arm.mu2PC.Lock() - defer arm.mu2PC.Unlock() - - // Получаем тип записи из Type поля - switch record.Type { - case 3: // 2PC_Prepare - arm.pending2PC[txRecord.ID] = &txRecord - if arm.callback != nil { - return arm.callback(record) - } - return nil - - case 4: // 2PC_Commit - if pending, ok := arm.pending2PC[txRecord.ID]; ok { - if pending.State == TransactionPrepared { - txRecord.State = TransactionCommitted - delete(arm.pending2PC, txRecord.ID) - if arm.callback != nil { - return arm.callback(record) - } - } - } - return nil - - case 5: // 2PC_Abort - delete(arm.pending2PC, txRecord.ID) - if arm.callback != nil { - return arm.callback(record) - } - return nil - - default: - if arm.callback != nil { - return arm.callback(record) - } - return nil - } -} - -// ДОБАВЛЕНО: Получение незавершённых 2PC транзакций -func (arm *AsyncRecoveryManager) GetPending2PCTransactions() []*TransactionRecord { - arm.mu2PC.RLock() - defer arm.mu2PC.RUnlock() - - result := make([]*TransactionRecord, 0, len(arm.pending2PC)) - for _, tx := range arm.pending2PC { - result = append(result, tx) - } - return result -} - -func (arm *AsyncRecoveryManager) worker() { - defer arm.wg.Done() - - for record := range arm.recordChan { - var err error - - // ДОБАВЛЕНО: Обработка 2PC записей - switch record.Type { - case 3, 4, 5: // 2PC записи - err = arm.handle2PC(record) - default: - 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(), - "pending_2pc": len(arm.pending2PC), - } -} - -// ========== MVCC ========== - -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 -} - -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) - _, ok := vm.entries.Load(key) - if !ok { - vm.missCount.Add(1) - return false - } - vm.hitCount.Add(1) - return true -} - -func (vm *VisibilityMap) GetStats() map[string]interface{} { - return map[string]interface{}{ - "hits": vm.hitCount.Load(), - "misses": vm.missCount.Load(), - } -} - -type ReadTimestampCache struct { - cache sync.Map - maxSize int - ttl time.Duration - hits atomic.Uint64 - misses atomic.Uint64 -} - -type cachedEntry struct { - doc *Document - cachedAt time.Time -} - -func NewReadTimestampCache(maxSize int, ttl time.Duration) *ReadTimestampCache { - if maxSize <= 0 { - maxSize = 10000 - } - if ttl <= 0 { - ttl = 5 * time.Minute - } - return &ReadTimestampCache{maxSize: maxSize, ttl: ttl} -} - -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.misses.Add(1) - return nil - } - rtc.hits.Add(1) - return entry.doc -} - -func (rtc *ReadTimestampCache) Set(docID string, timestamp int64, doc *Document) { - key := fmt.Sprintf("%s@%d", docID, timestamp) - rtc.cache.Store(key, &cachedEntry{doc: doc, cachedAt: time.Now()}) -} - -func (rtc *ReadTimestampCache) GetStats() map[string]interface{} { - return map[string]interface{}{ - "hits": rtc.hits.Load(), - "misses": rtc.misses.Load(), - } -} - -// ========== Transaction ========== - -type Transaction struct { - ID TransactionID - State atomic.Int32 - Operations []Operation - StartTime int64 - Version uint64 - mu sync.RWMutex - // ДОБАВЛЕНО: для 2PC - IsDistributed bool - Nodes []string - PreparedNodes map[string]bool -} - -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 - // ДОБАВЛЕНО: синхронизация с бэкапами - backupLock sync.RWMutex - backupInProgress atomic.Bool - pending2PCTransactions []*TransactionRecord - pending2PCMu sync.RWMutex -} - -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(TwoPhaseCommitTimeout), - deadlockDetector: NewDeadlockDetector(DeadlockCheckInterval, DefaultTxTimeout), - pending2PCTransactions: make([]*TransactionRecord, 0), - } - globalTxManager.nextTxID.Store(1) - - var walErr error - globalTxManager.wal, walErr = NewSegmentedWALManager(filepath.Dir(walPath), nil) - if walErr != nil { - err = walErr - return - } - - globalTxManager.startAsyncRecovery() - - go globalTxManager.checkpointLoop() - go globalTxManager.versionCleanupLoop() - go globalTxManager.recoverPending2PC() // ДОБАВЛЕНО - }) - return err -} - -// ДОБАВЛЕНО: Восстановление незавершённых 2PC транзакций -func (tm *TransactionManager) recoverPending2PC() { - if tm.recoveryManager == nil { - return - } - - ticker := time.NewTicker(5 * time.Second) - defer ticker.Stop() - - for range ticker.C { - pending := tm.recoveryManager.GetPending2PCTransactions() - if len(pending) == 0 { - continue - } - - tm.pending2PCMu.Lock() - for _, tx := range pending { - // Проверяем, не истёк ли таймаут - if time.Now().UnixMilli()-tx.Timestamp > int64(TwoPhaseCommitTimeout.Milliseconds()) { - // Откатываем просроченную транзакцию - tm.distCoord.Abort(tx.ID) - if tm.logger != nil { - tm.logger.Warn(fmt.Sprintf("Aborted pending 2PC transaction %d due to timeout", tx.ID)) - } - } else { - tm.pending2PCTransactions = append(tm.pending2PCTransactions, tx) - } - } - tm.pending2PCMu.Unlock() - } -} - -// ДОБАВЛЕНО: Получение незавершённых 2PC транзакций для бэкапа -func (tm *TransactionManager) GetPending2PCTransactions() []*TransactionRecord { - tm.pending2PCMu.RLock() - defer tm.pending2PCMu.RUnlock() - result := make([]*TransactionRecord, len(tm.pending2PCTransactions)) - copy(result, tm.pending2PCTransactions) - return result -} - -// ДОБАВЛЕНО: Блокировка для бэкапа -func (tm *TransactionManager) LockForBackup() { - tm.backupLock.Lock() - tm.backupInProgress.Store(true) -} - -// ДОБАВЛЕНО: Разблокировка после бэкапа -func (tm *TransactionManager) UnlockForBackup() { - tm.backupInProgress.Store(false) - tm.backupLock.Unlock() -} - -// ДОБАВЛЕНО: Проверка, выполняется ли бэкап -func (tm *TransactionManager) IsBackupInProgress() bool { - return tm.backupInProgress.Load() -} - -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 || record.Type == 3 || record.Type == 4 || record.Type == 5 { - var txRecord TransactionRecord - if err := json.Unmarshal(record.Data, &txRecord); err != nil { - return err - } - - switch record.Type { - case 3: // 2PC_Prepare - // Сохраняем в pending для дальнейшего восстановления - return nil - case 4: // 2PC_Commit - if txRecord.State == TransactionPrepared { - txRecord.State = TransactionCommitted - for _, op := range txRecord.Operations { - if err := applyOperation(op); err != nil { - return err - } - } - } - return nil - case 5: // 2PC_Abort - return nil - default: - if txRecord.State == TransactionCommitted { - for _, op := range txRecord.Operations { - if err := applyOperation(op); err != nil { - return err - } - } - } - return nil - } - } - 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, %d pending 2PC", - stats["recovered"], stats["pending_2pc"])) - } - 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, %d pending 2PC", - stats["recovered"], stats["errors"], stats["pending_2pc"])) - } - 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"], - "pending_2pc": stats["pending_2pc"], - } -} - -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 BeginTransaction() *Transaction { - if globalTxManager == nil { - InitTransactionManager("futriis.wal") - } - - tx := &Transaction{ - ID: TransactionID(globalTxManager.nextTxID.Add(1) - 1), - StartTime: time.Now().UnixMilli(), - Operations: make([]Operation, 0, 100), - Version: 1, - } - tx.State.Store(int32(TransactionActive)) - - globalTxManager.activeTransactions.Store(tx.ID, tx) - currentTx.Store(tx) - - AuditLog("START", "TRANSACTION", fmt.Sprintf("%d", tx.ID), map[string]interface{}{ - "start_time": tx.StartTime, - }) - - return tx -} - -// ДОБАВЛЕНО: Начало распределённой транзакции (2PC) -func BeginDistributedTransaction(nodes []string) (*Transaction, error) { - if globalTxManager == nil { - if err := InitTransactionManager("futriis.wal"); err != nil { - return nil, err - } - } - - tx := BeginTransaction() - if tx == nil { - return nil, fmt.Errorf("failed to create transaction") - } - - tx.IsDistributed = true - tx.Nodes = nodes - tx.PreparedNodes = make(map[string]bool) - - 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 -} - -// ДОБАВЛЕНО: Подготовка 2PC транзакции -func PrepareDistributedTransaction(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") - } - - // Записываем Prepare в WAL - txRecord := &TransactionRecord{ - ID: txID, - State: TransactionPrepared, - Timestamp: time.Now().UnixMilli(), - Operations: tx.Operations, - IsDistributed: tx.IsDistributed, - Nodes: tx.Nodes, - } - - data, err := json.Marshal(txRecord) - if err != nil { - return err - } - - walRecord := &WALRecord{ - Type: 3, // 2PC_Prepare - Data: data, - } - - if err := globalTxManager.wal.Write(walRecord); err != nil { - return err - } - - // Обновляем состояние - tx.State.Store(int32(TransactionPrepared)) - - // Обновляем LSN для 2PC - globalTxManager.wal.SetPrepareLSN(walRecord.LSN) - - AuditLog("PREPARE", "TRANSACTION", fmt.Sprintf("%d", txID), map[string]interface{}{ - "nodes": tx.Nodes, - }) - - return nil -} - -// ДОБАВЛЕНО: Commit распределённой транзакции (2PC) -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()) != TransactionPrepared { - return fmt.Errorf("transaction is not prepared") - } - - // Записываем Commit в WAL - txRecord := &TransactionRecord{ - ID: txID, - State: TransactionCommitted, - Timestamp: time.Now().UnixMilli(), - Operations: tx.Operations, - IsDistributed: tx.IsDistributed, - Nodes: tx.Nodes, - } - - data, err := json.Marshal(txRecord) - if err != nil { - return err - } - - walRecord := &WALRecord{ - Type: 4, // 2PC_Commit - Data: data, - } - - if err := globalTxManager.wal.Write(walRecord); err != nil { - return err - } - - // Применяем операции - 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) - - AuditLog("COMMIT_2PC", "TRANSACTION", fmt.Sprintf("%d", txID), map[string]interface{}{ - "nodes": tx.Nodes, - }) - - return nil -} - -// ДОБАВЛЕНО: Abort распределённой транзакции (2PC) -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) - - // Записываем Abort в WAL - txRecord := &TransactionRecord{ - ID: txID, - State: TransactionAborted, - Timestamp: time.Now().UnixMilli(), - Operations: tx.Operations, - IsDistributed: tx.IsDistributed, - Nodes: tx.Nodes, - } - - data, err := json.Marshal(txRecord) - if err != nil { - return err - } - - walRecord := &WALRecord{ - Type: 5, // 2PC_Abort - Data: data, - } - - if err := globalTxManager.wal.Write(walRecord); err != nil { - return err - } - - tx.State.Store(int32(TransactionAborted)) - globalTxManager.activeTransactions.Delete(txID) - - AuditLog("ABORT_2PC", "TRANSACTION", fmt.Sprintf("%d", txID), map[string]interface{}{ - "nodes": tx.Nodes, - }) - - return nil -} - -func BeginTransactionWithTimeout(timeout time.Duration) *Transaction { - tx := BeginTransaction() - if tx == nil { - return nil - } - - time.AfterFunc(timeout, func() { - if tx != nil && TransactionState(tx.State.Load()) == TransactionActive { - tx.State.Store(int32(TransactionAborted)) - if globalTxManager != nil { - globalTxManager.activeTransactions.Delete(tx.ID) - } - AuditLog("TIMEOUT", "TRANSACTION", fmt.Sprintf("%d", tx.ID), map[string]interface{}{ - "timeout_ms": timeout.Milliseconds(), - }) - } - }) - - return tx -} - -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 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") - } - - // Проверяем, не является ли транзакция распределённой - if tx.IsDistributed { - return fmt.Errorf("distributed transaction must use CommitDistributedTransaction") - } - - 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 { - globalTxManager.AddDocumentVersion(op.DocumentID, &DocumentVersion{ - Document: doc.Clone(), - Timestamp: time.Now().UnixMilli(), - TxID: tx.ID, - }) - } - } - } - } - } - } - - tx.State.Store(int32(TransactionCommitted)) - - // Записываем Commit в WAL - 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, // Transaction - Data: data, - } - globalTxManager.wal.Write(walRecord) - } - - AuditLog("COMMIT", "TRANSACTION", fmt.Sprintf("%d", tx.ID), map[string]interface{}{ - "operations": len(tx.Operations), - }) - - 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)) - - AuditLog("ABORT", "TRANSACTION", fmt.Sprintf("%d", tx.ID), map[string]interface{}{ - "operations": len(tx.Operations), - }) - - currentTx.Store(nil) - globalTxManager.activeTransactions.Delete(tx.ID) - - 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" - case TransactionPrepared: - status = "prepared" - } - - 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, - }) - } - tx.mu.RUnlock() - - info := TransactionInfo{ - ID: fmt.Sprintf("%d", tx.ID), - Status: status, - StartTime: tx.StartTime, - OperationCount: opCount, - Operations: operations, - } - if tx.IsDistributed { - info.Status = "distributed_" + status - } - 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() - - 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 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 - return coll.Insert(doc) - - case "update": - return coll.Update(op.DocumentID, op.Data) - - case "delete": - return coll.Delete(op.DocumentID) - } - - return nil -} - -func SetGlobalStorage(s *Storage) { - globalStorage = s -} - -func GetGlobalStorage() *Storage { - return globalStorage -} - -func AuditLog(operation, dataType, name string, details map[string]interface{}) { - LogAudit(operation, dataType, name, details) -} - -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 - // ДОБАВЛЕНО: сохраняем LSN для бэкапов - checkpoint["backup_lsn"] = tm.wal.GetBackupLSN() - checkpoint["prepare_lsn"] = tm.wal.GetPrepareLSN() - - 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 StopTransactionManager() error { - if globalTxManager == nil { - return nil - } - - if globalTxManager.deadlockDetector != nil { - globalTxManager.deadlockDetector.Stop() - } - - if globalTxManager.wal != nil { - return globalTxManager.wal.Close() - } - - return nil -} - -// ========== 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) - // Проверяем, не является ли транзакция распределённой - 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) - 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 - TxPrepared - TxCommitted - TxAborted - TxTimeout -) - -type DistributedTxInfo struct { - TxID TransactionID - Nodes []string - Prepared map[string]bool - Committed map[string]bool - 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 = TwoPhaseCommitTimeout - } - return &DistributedTransactionCoordinator{timeout: timeout} -} - -func (dtc *DistributedTransactionCoordinator) Prepare(txID TransactionID, nodes []string) error { - info := &DistributedTxInfo{ - TxID: txID, - Nodes: nodes, - Prepared: make(map[string]bool), - Committed: make(map[string]bool), - Status: TxActive, - StartTime: time.Now().UnixMilli(), - Timeout: dtc.timeout, - } - dtc.pendingTxs.Store(txID, info) - return nil -} - -func (dtc *DistributedTransactionCoordinator) VoteCommit(txID TransactionID, node string) error { - val, ok := dtc.pendingTxs.Load(txID) - if !ok { - return fmt.Errorf("transaction not found: %d", txID) - } - info := val.(*DistributedTxInfo) - - dtc.mu.Lock() - info.Prepared[node] = true - dtc.mu.Unlock() - - if len(info.Prepared) == len(info.Nodes) { - return dtc.Commit(txID) - } - 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 -} - -// ========== Дополнительные функции ========== - -type DocumentVersion struct { - Document *Document `json:"document"` - Timestamp int64 `json:"timestamp"` - TxID TransactionID `json:"tx_id"` -} - -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"` -} - -type OperationInfo struct { - Type string `json:"type"` - Database string `json:"database"` - Collection string `json:"collection"` - DocumentID string `json:"document_id"` -} - -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"` -} - -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, - } -}