1933 lines
58 KiB
Go
1933 lines
58 KiB
Go
/*
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* Copyright 2026 Safronov Grigorii
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*
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* Licensed under the CDDL, Version 1.0 (the "License");
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* you may not use this file except in compliance with the License.
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*
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* You may obtain a copy of the License at
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* https://opensource.org/licenses/CDDL-1.0
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*/
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// Файл: internal/storage/transaction.go
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// Назначение: Реализация транзакций с поддержкой MVCC (Multi-Version Concurrency Control)
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// и WAL (Write-Ahead Log) без блокировок. Использует атомарные операции и версионирование.
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// ОПТИМИЗИРОВАНО: пакетная запись WAL, буферизация, асинхронная обработка.
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// УЛУЧШЕНИЯ: Segmented WAL, Parallel Recovery, Visibility Map, Version Pruning,
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// Distributed Transactions, Deadlock Detection, Transaction Timeout, Savepoints,
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// Асинхронное восстановление WAL, реальный fsync.
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package storage
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import (
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"bufio"
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"encoding/binary"
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"sort"
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"sync"
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"sync/atomic"
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"time"
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)
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// ========== Базовые типы ==========
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// TransactionID представляет уникальный идентификатор транзакции
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type TransactionID uint64
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// TransactionState представляет состояние транзакции
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type TransactionState int32
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const (
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TransactionActive TransactionState = iota
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TransactionCommitted
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TransactionAborted
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)
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// TransactionRecord представляет запись в WAL
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type TransactionRecord struct {
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ID TransactionID `json:"id"`
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State TransactionState `json:"state"`
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Timestamp int64 `json:"timestamp"`
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Operations []Operation `json:"operations"`
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}
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// Operation представляет одну операцию в транзакции
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type Operation struct {
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Type string `json:"type"` // "insert", "update", "delete"
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Database string `json:"database"`
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Collection string `json:"collection"`
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DocumentID string `json:"document_id"`
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Data map[string]interface{} `json:"data"`
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Version uint64 `json:"version"`
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OldData map[string]interface{} `json:"old_data"` // для отката
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}
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// DocumentVersion представляет версию документа для MVCC
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type DocumentVersion struct {
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Document *Document `json:"document"`
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Timestamp int64 `json:"timestamp"`
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TxID TransactionID `json:"tx_id"`
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}
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// TransactionInfo представляет информацию о транзакции для API
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type TransactionInfo struct {
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ID string `json:"id"`
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Status string `json:"status"`
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StartTime int64 `json:"start_time"`
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OperationCount int `json:"operation_count"`
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Operations []OperationInfo `json:"operations,omitempty"`
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}
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// OperationInfo представляет информацию об операции для API
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type OperationInfo struct {
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Type string `json:"type"`
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Database string `json:"database"`
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Collection string `json:"collection"`
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DocumentID string `json:"document_id"`
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}
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// WALRecord представляет запись в WAL файле
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type WALRecord struct {
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CRC uint32 `json:"crc"`
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Length uint32 `json:"length"`
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Type byte `json:"type"` // 1=Transaction, 2=Checkpoint
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Data []byte `json:"data"`
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Timestamp int64 `json:"timestamp"`
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LSN uint64 `json:"lsn"` // Log Sequence Number
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}
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// ========== Константы ==========
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const (
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// WAL Segment
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WALSegmentSize = 64 * 1024 * 1024 // 64MB per segment
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WALSegmentPrefix = "wal_segment_"
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WALIndexPrefix = "wal_index_"
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// MVCC
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VisibilityMapSize = 1024 * 1024
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VersionPruneInterval = 5 * time.Minute
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MaxVersionsPerDoc = 100
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VersionRetentionDays = 7
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// Transactions
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DefaultTxTimeout = 30 * time.Second
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DeadlockCheckInterval = 1 * time.Second
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MaxSavepointsPerTx = 100
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// Distributed Transactions
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TwoPhaseCommitTimeout = 10 * time.Second
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// Асинхронное восстановление WAL
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AsyncRecoveryBufferSize = 10000
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AsyncRecoveryWorkers = 4
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AsyncRecoveryTimeout = 30 * time.Second
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// Fsync
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FsyncMaxRetries = 3
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FsyncRetryDelay = 100 * time.Millisecond
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)
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// ========== CRC32 таблица ==========
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var crc32Table = [256]uint32{
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1a4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
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}
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// crc32 вычисляет CRC32 хеш
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func crc32(data []byte) uint32 {
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crc := uint32(0xFFFFFFFF)
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for _, b := range data {
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crc = (crc >> 8) ^ crc32Table[(crc^uint32(b))&0xFF]
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}
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return crc ^ 0xFFFFFFFF
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}
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// ========== WALManager ==========
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// WALManager управляет Write-Ahead Log с оптимизациями для высокой нагрузки
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type WALManager struct {
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mu sync.RWMutex
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file *os.File
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writer *bufio.Writer
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path string
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currentLSN uint64
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lastSync time.Time
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syncInterval time.Duration
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bufferSize int
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closed bool
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writeChan chan *WALRecord
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stopChan chan struct{}
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wg sync.WaitGroup
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batchSize int
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}
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// NewWALManager создаёт новый WAL менеджер с оптимизациями
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func NewWALManager(path string) (*WALManager, error) {
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dir := filepath.Dir(path)
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if err := os.MkdirAll(dir, 0755); err != nil {
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return nil, fmt.Errorf("failed to create WAL directory: %v", err)
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}
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file, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644)
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if err != nil {
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return nil, fmt.Errorf("failed to open WAL file: %v", err)
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}
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var currentLSN uint64 = 1
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stat, err := file.Stat()
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if err == nil && stat.Size() > 0 {
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currentLSN = uint64(stat.Size()) / 100
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if currentLSN < 1 {
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currentLSN = 1
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}
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}
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wm := &WALManager{
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file: file,
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writer: bufio.NewWriterSize(file, 64*1024),
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path: path,
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currentLSN: currentLSN,
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lastSync: time.Now(),
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syncInterval: 5 * time.Second,
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bufferSize: 64 * 1024,
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writeChan: make(chan *WALRecord, 10000),
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stopChan: make(chan struct{}),
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batchSize: 100,
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}
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wm.wg.Add(1)
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go wm.writerLoop()
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return wm, nil
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}
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// writerLoop асинхронно записывает записи в WAL пакетами
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func (wm *WALManager) writerLoop() {
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defer wm.wg.Done()
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batch := make([]*WALRecord, 0, wm.batchSize)
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ticker := time.NewTicker(wm.syncInterval)
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defer ticker.Stop()
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for {
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select {
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case record, ok := <-wm.writeChan:
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if !ok {
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if len(batch) > 0 {
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wm.flushBatch(batch)
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}
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return
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}
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batch = append(batch, record)
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if len(batch) >= wm.batchSize {
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wm.flushBatch(batch)
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batch = batch[:0]
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}
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case <-ticker.C:
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if len(batch) > 0 {
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wm.flushBatch(batch)
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batch = batch[:0]
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}
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if time.Since(wm.lastSync) >= wm.syncInterval {
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wm.sync()
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}
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case <-wm.stopChan:
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if len(batch) > 0 {
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wm.flushBatch(batch)
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}
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wm.sync()
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return
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}
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}
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}
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// flushBatch записывает пакет записей
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func (wm *WALManager) flushBatch(batch []*WALRecord) {
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wm.mu.Lock()
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defer wm.mu.Unlock()
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for _, record := range batch {
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data, err := json.Marshal(record)
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if err != nil {
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continue
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}
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lenBuf := make([]byte, 4)
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binary.BigEndian.PutUint32(lenBuf, uint32(len(data)))
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if _, err := wm.writer.Write(lenBuf); err != nil {
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continue
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}
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if _, err := wm.writer.Write(data); err != nil {
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continue
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}
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record.LSN = wm.currentLSN
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wm.currentLSN++
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}
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}
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// sync синхронизирует буфер с диском с реальным fsync
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func (wm *WALManager) sync() {
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wm.mu.Lock()
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defer wm.mu.Unlock()
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if err := wm.writer.Flush(); err == nil {
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// Реальный fsync с повторными попытками (используем функции из fsync.go)
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if err := RealFsyncWithRetry(wm.file, FsyncMaxRetries, FsyncRetryDelay); err == nil {
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wm.lastSync = time.Now()
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}
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}
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}
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// Write записывает запись в WAL
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func (wm *WALManager) Write(record *WALRecord) error {
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if wm.closed {
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return fmt.Errorf("WAL is closed")
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}
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record.Timestamp = time.Now().UnixMilli()
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data, err := json.Marshal(record.Data)
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if err != nil {
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return err
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}
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record.CRC = crc32(data)
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select {
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case wm.writeChan <- record:
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return nil
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case <-time.After(100 * time.Millisecond):
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return fmt.Errorf("WAL write timeout")
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}
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}
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// ReadAll читает все записи из WAL
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func (wm *WALManager) ReadAll() ([]*WALRecord, error) {
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wm.mu.RLock()
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defer wm.mu.RUnlock()
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wm.writer.Flush()
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file, err := os.Open(wm.path)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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records := make([]*WALRecord, 0)
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reader := bufio.NewReader(file)
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lenBuf := make([]byte, 4)
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for {
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_, err := reader.Read(lenBuf)
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if err != nil {
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break
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}
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recordLen := binary.BigEndian.Uint32(lenBuf)
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recordData := make([]byte, recordLen)
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_, err = reader.Read(recordData)
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if err != nil {
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break
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}
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var record WALRecord
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if err := json.Unmarshal(recordData, &record); err != nil {
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continue
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}
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data, _ := json.Marshal(record.Data)
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if crc32(data) != record.CRC {
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continue
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}
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records = append(records, &record)
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}
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return records, nil
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}
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// Close закрывает WAL с финальной синхронизацией
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func (wm *WALManager) Close() error {
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wm.mu.Lock()
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wm.closed = true
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wm.mu.Unlock()
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close(wm.stopChan)
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close(wm.writeChan)
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wm.wg.Wait()
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wm.mu.Lock()
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defer wm.mu.Unlock()
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if err := wm.writer.Flush(); err != nil {
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return err
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}
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// Финальный fsync
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RealFsync(wm.file)
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return wm.file.Close()
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}
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// ========== Segmented WAL Manager ==========
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// WALSegment представляет сегмент WAL файла
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type WALSegment struct {
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ID uint32
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File *os.File
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Writer *bufio.Writer
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Path string
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StartLSN uint64
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EndLSN uint64
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Size int64
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mu sync.Mutex
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}
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// WALIndexEntry представляет запись в индексе WAL
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type WALIndexEntry struct {
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LSN uint64
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SegmentID uint32
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Offset int64
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Length uint32
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Checksum uint32
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}
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// WALIndexManager управляет индексом для быстрого поиска LSN
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type WALIndexManager struct {
|
||
index map[uint64]*WALIndexEntry
|
||
segments map[uint32]*WALSegment
|
||
mu sync.RWMutex
|
||
indexPath string
|
||
}
|
||
|
||
// SegmentedWALManager расширяет WALManager с поддержкой сегментов
|
||
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
|
||
}
|
||
|
||
// NewSegmentedWALManager создаёт новый сегментированный WAL менеджер
|
||
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
|
||
}
|
||
|
||
// loadExistingSegments загружает существующие сегменты WAL
|
||
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 создаёт новый сегмент WAL
|
||
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
|
||
}
|
||
|
||
// getCurrentLSN возвращает текущий LSN
|
||
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)
|
||
}
|
||
|
||
// Write записывает запись в WAL
|
||
func (wm *SegmentedWALManager) Write(record *WALRecord) error {
|
||
record.Timestamp = time.Now().UnixMilli()
|
||
wm.writeChan <- record
|
||
return nil
|
||
}
|
||
|
||
// writerLoop асинхронно записывает записи
|
||
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
|
||
}
|
||
}
|
||
}
|
||
|
||
// flushBatch записывает пакет записей с реальным fsync
|
||
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()
|
||
// Реальный fsync после записи пакета
|
||
RealFsync(wm.currentSegment.File)
|
||
wm.index.save()
|
||
}
|
||
|
||
// ReadAll читает все записи из всех сегментов WAL
|
||
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
|
||
}
|
||
|
||
// readSegmentRecords читает все записи из одного сегмента
|
||
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
|
||
}
|
||
|
||
// Close закрывает SegmentedWALManager
|
||
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
|
||
}
|
||
|
||
// addEntry добавляет запись в индекс
|
||
func (im *WALIndexManager) addEntry(entry *WALIndexEntry) {
|
||
im.mu.Lock()
|
||
defer im.mu.Unlock()
|
||
im.index[entry.LSN] = entry
|
||
}
|
||
|
||
// FindByLSN ищет запись по LSN
|
||
func (im *WALIndexManager) FindByLSN(lsn uint64) *WALIndexEntry {
|
||
im.mu.RLock()
|
||
defer im.mu.RUnlock()
|
||
return im.index[lsn]
|
||
}
|
||
|
||
// save сохраняет индекс на диск
|
||
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)
|
||
}
|
||
|
||
// load загружает индекс с диска
|
||
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 ==========
|
||
|
||
// AsyncRecoveryManager управляет асинхронным восстановлением из WAL
|
||
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
|
||
}
|
||
|
||
// NewAsyncRecoveryManager создаёт менеджер асинхронного восстановления
|
||
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
|
||
}
|
||
|
||
// worker обрабатывает записи из канала
|
||
func (arm *AsyncRecoveryManager) worker() {
|
||
defer arm.wg.Done()
|
||
|
||
for record := range arm.recordChan {
|
||
if err := arm.callback(record); err != nil {
|
||
select {
|
||
case arm.errChan <- err:
|
||
default:
|
||
}
|
||
arm.errorCnt.Add(1)
|
||
} else {
|
||
arm.recoveredCnt.Add(1)
|
||
}
|
||
}
|
||
}
|
||
|
||
// errorMonitor отслеживает ошибки и может остановить процесс
|
||
func (arm *AsyncRecoveryManager) errorMonitor() {
|
||
criticalErrors := 0
|
||
for range arm.errChan {
|
||
criticalErrors++
|
||
if criticalErrors > 10 {
|
||
arm.Stop()
|
||
return
|
||
}
|
||
}
|
||
}
|
||
|
||
// Push добавляет запись для восстановления
|
||
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
|
||
}
|
||
}
|
||
|
||
// Wait ожидает завершения всех воркеров
|
||
func (arm *AsyncRecoveryManager) Wait() {
|
||
close(arm.recordChan)
|
||
arm.wg.Wait()
|
||
close(arm.doneChan)
|
||
}
|
||
|
||
// Stop останавливает восстановление
|
||
func (arm *AsyncRecoveryManager) Stop() {
|
||
arm.mu.Lock()
|
||
if !arm.isRunning {
|
||
arm.mu.Unlock()
|
||
return
|
||
}
|
||
arm.isRunning = false
|
||
arm.mu.Unlock()
|
||
|
||
close(arm.recordChan)
|
||
}
|
||
|
||
// GetStats возвращает статистику восстановления
|
||
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(),
|
||
}
|
||
}
|
||
|
||
// ========== MVCC Improvements ==========
|
||
|
||
// VisibilityMapEntry представляет запись в карте видимости
|
||
type VisibilityMapEntry struct {
|
||
DocID string
|
||
VisibleFrom uint64
|
||
VisibleTo uint64
|
||
IsVisible bool
|
||
LastAccess int64
|
||
}
|
||
|
||
// VisibilityMap управляет битовой картой видимости версий
|
||
type VisibilityMap struct {
|
||
entries sync.Map
|
||
maxSize int
|
||
hitCount atomic.Uint64
|
||
missCount atomic.Uint64
|
||
}
|
||
|
||
// NewVisibilityMap создаёт новую карту видимости
|
||
func NewVisibilityMap(maxSize int) *VisibilityMap {
|
||
if maxSize <= 0 {
|
||
maxSize = VisibilityMapSize
|
||
}
|
||
return &VisibilityMap{maxSize: maxSize}
|
||
}
|
||
|
||
// MarkVisible отмечает версию как видимую
|
||
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(),
|
||
})
|
||
}
|
||
|
||
// IsVisible проверяет видимость версии
|
||
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
|
||
}
|
||
|
||
// GetStats возвращает статистику
|
||
func (vm *VisibilityMap) GetStats() map[string]interface{} {
|
||
return map[string]interface{}{
|
||
"hits": vm.hitCount.Load(),
|
||
"misses": vm.missCount.Load(),
|
||
}
|
||
}
|
||
|
||
// ReadTimestampCache кэширует версии документов по timestamp
|
||
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
|
||
}
|
||
|
||
// NewReadTimestampCache создаёт новый кэш
|
||
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}
|
||
}
|
||
|
||
// Get возвращает кэшированную версию документа
|
||
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
|
||
}
|
||
|
||
// Set добавляет версию в кэш
|
||
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()})
|
||
}
|
||
|
||
// GetStats возвращает статистику кэша
|
||
func (rtc *ReadTimestampCache) GetStats() map[string]interface{} {
|
||
return map[string]interface{}{
|
||
"hits": rtc.hits.Load(),
|
||
"misses": rtc.misses.Load(),
|
||
}
|
||
}
|
||
|
||
// ========== Transaction ==========
|
||
|
||
// Transaction представляет одну транзакцию
|
||
type Transaction struct {
|
||
ID TransactionID
|
||
State atomic.Int32
|
||
Operations []Operation
|
||
StartTime int64
|
||
Version uint64
|
||
mu sync.RWMutex
|
||
}
|
||
|
||
// TransactionManager управляет транзакциями с поддержкой MVCC
|
||
type TransactionManager struct {
|
||
activeTransactions sync.Map // map[TransactionID]*Transaction
|
||
nextTxID atomic.Uint64
|
||
wal *SegmentedWALManager
|
||
logger LoggerInterface
|
||
mu sync.RWMutex
|
||
walPath string
|
||
checkpointInterval int64
|
||
lastCheckpoint int64
|
||
checkpointFile *os.File
|
||
documentVersions sync.Map // map[string][]*DocumentVersion
|
||
maxVersions int
|
||
visibilityMap *VisibilityMap
|
||
readCache *ReadTimestampCache
|
||
distCoord *DistributedTransactionCoordinator
|
||
deadlockDetector *DeadlockDetector
|
||
recoveryManager *AsyncRecoveryManager
|
||
recoveryComplete atomic.Bool
|
||
}
|
||
|
||
var (
|
||
globalTxManager *TransactionManager
|
||
txManagerOnce sync.Once
|
||
currentTx atomic.Value // *Transaction
|
||
globalStorage *Storage
|
||
)
|
||
|
||
// InitTransactionManager инициализирует глобальный менеджер транзакций
|
||
func InitTransactionManager(walPath string) error {
|
||
return InitTransactionManagerWithConfig(walPath, nil)
|
||
}
|
||
|
||
// InitTransactionManagerWithConfig инициализирует менеджер транзакций с конфигурацией
|
||
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),
|
||
}
|
||
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()
|
||
})
|
||
return err
|
||
}
|
||
|
||
// startAsyncRecovery запускает асинхронное восстановление из WAL
|
||
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/%d records recovered",
|
||
stats["recovered"], len(records)))
|
||
}
|
||
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
|
||
}
|
||
}
|
||
}()
|
||
}
|
||
|
||
// IsRecoveryComplete возвращает статус восстановления
|
||
func (tm *TransactionManager) IsRecoveryComplete() bool {
|
||
return tm.recoveryComplete.Load()
|
||
}
|
||
|
||
// GetRecoveryProgress возвращает прогресс восстановления
|
||
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"],
|
||
}
|
||
}
|
||
|
||
// SetTransactionLogger устанавливает логгер для транзакций
|
||
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)
|
||
}
|
||
}
|
||
}
|
||
|
||
// BeginTransaction начинает новую транзакцию
|
||
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
|
||
}
|
||
|
||
// BeginTransactionWithTimeout начинает транзакцию с таймаутом
|
||
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
|
||
}
|
||
|
||
// BeginTransactionOnCollection начинает транзакцию для конкретной коллекции
|
||
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
|
||
}
|
||
|
||
// CommitCurrentTransaction коммитит текущую транзакцию
|
||
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")
|
||
}
|
||
|
||
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))
|
||
|
||
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
|
||
}
|
||
|
||
// AbortCurrentTransaction откатывает текущую транзакцию
|
||
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
|
||
}
|
||
|
||
// HasActiveTransaction проверяет наличие активной транзакции
|
||
func HasActiveTransaction() bool {
|
||
return currentTx.Load() != nil
|
||
}
|
||
|
||
// GetCurrentTransactionID возвращает ID текущей транзакции
|
||
func GetCurrentTransactionID() string {
|
||
txVal := currentTx.Load()
|
||
if txVal == nil {
|
||
return ""
|
||
}
|
||
tx := txVal.(*Transaction)
|
||
return fmt.Sprintf("%d", tx.ID)
|
||
}
|
||
|
||
// GetActiveTransactions возвращает список активных транзакций для API
|
||
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"
|
||
if TransactionState(tx.State.Load()) == TransactionCommitted {
|
||
status = "committed"
|
||
} else if TransactionState(tx.State.Load()) == 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,
|
||
})
|
||
}
|
||
tx.mu.RUnlock()
|
||
|
||
transactions = append(transactions, TransactionInfo{
|
||
ID: fmt.Sprintf("%d", tx.ID),
|
||
Status: status,
|
||
StartTime: tx.StartTime,
|
||
OperationCount: opCount,
|
||
Operations: operations,
|
||
})
|
||
return true
|
||
})
|
||
|
||
return transactions
|
||
}
|
||
|
||
// GetTransactionByID возвращает транзакцию по ID
|
||
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")
|
||
}
|
||
|
||
// AddToTransaction добавляет операцию в текущую транзакцию
|
||
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
|
||
}
|
||
|
||
// FindInTransaction ищет документ в контексте транзакции с поддержкой MVCC
|
||
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)
|
||
}
|
||
|
||
// applyOperation применяет операцию к хранилищу
|
||
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
|
||
}
|
||
|
||
// SetGlobalStorage устанавливает глобальное хранилище
|
||
func SetGlobalStorage(s *Storage) {
|
||
globalStorage = s
|
||
}
|
||
|
||
// GetGlobalStorage возвращает глобальное хранилище
|
||
func GetGlobalStorage() *Storage {
|
||
return globalStorage
|
||
}
|
||
|
||
// AuditLog записывает событие в аудит
|
||
func AuditLog(operation, dataType, name string, details map[string]interface{}) {
|
||
LogAudit(operation, dataType, name, details)
|
||
}
|
||
|
||
// AddDocumentVersion добавляет версию документа для MVCC
|
||
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)
|
||
}
|
||
}
|
||
|
||
// GetDocumentVersion возвращает версию документа на определённый момент времени
|
||
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
|
||
}
|
||
|
||
// checkpointLoop периодически создаёт чекпоинты
|
||
func (tm *TransactionManager) checkpointLoop() {
|
||
ticker := time.NewTicker(time.Duration(tm.checkpointInterval) * time.Second)
|
||
defer ticker.Stop()
|
||
|
||
for range ticker.C {
|
||
tm.createCheckpoint()
|
||
}
|
||
}
|
||
|
||
// createCheckpoint создаёт чекпоинт текущего состояния
|
||
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
|
||
|
||
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))
|
||
}
|
||
}
|
||
|
||
// versionCleanupLoop периодически очищает старые версии документов
|
||
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
|
||
})
|
||
}
|
||
}
|
||
|
||
// StopTransactionManager останавливает менеджер транзакций
|
||
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 ==========
|
||
|
||
// DeadlockDetector обнаруживает циклические зависимости между транзакциями
|
||
type DeadlockDetector struct {
|
||
waitForGraph sync.Map
|
||
checkInterval time.Duration
|
||
timeout time.Duration
|
||
mu sync.RWMutex
|
||
stopChan chan struct{}
|
||
wg sync.WaitGroup
|
||
logger LoggerInterface
|
||
}
|
||
|
||
// NewDeadlockDetector создаёт новый детектор дедлоков
|
||
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
|
||
}
|
||
|
||
// SetLogger устанавливает логгер для детектора дедлоков
|
||
func (dd *DeadlockDetector) SetLogger(logger LoggerInterface) {
|
||
dd.logger = logger
|
||
}
|
||
|
||
// Stop останавливает детектор
|
||
func (dd *DeadlockDetector) Stop() {
|
||
close(dd.stopChan)
|
||
dd.wg.Wait()
|
||
}
|
||
|
||
// AddWaiting добавляет ожидающую транзакцию
|
||
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)
|
||
}
|
||
|
||
// RemoveWaiting удаляет ожидающую транзакцию
|
||
func (dd *DeadlockDetector) RemoveWaiting(txID TransactionID) {
|
||
dd.waitForGraph.Delete(txID)
|
||
}
|
||
|
||
// detectLoop обнаруживает циклы в графе ожидания
|
||
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
|
||
}
|
||
}
|
||
}
|
||
|
||
// detect выполняет обнаружение дедлоков
|
||
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
|
||
})
|
||
}
|
||
|
||
// resolveDeadlock разрешает дедлок, откатывая одну из транзакций
|
||
func (dd *DeadlockDetector) resolveDeadlock(txID1, txID2 TransactionID) {
|
||
if globalTxManager != nil {
|
||
if val, ok := globalTxManager.activeTransactions.Load(txID1); ok {
|
||
tx := val.(*Transaction)
|
||
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 ==========
|
||
|
||
// TxState представляет состояние транзакции
|
||
type TxState int32
|
||
|
||
const (
|
||
TxActive TxState = iota
|
||
TxPrepared
|
||
TxCommitted
|
||
TxAborted
|
||
TxTimeout
|
||
)
|
||
|
||
// DistributedTxInfo содержит информацию о распределённой транзакции
|
||
type DistributedTxInfo struct {
|
||
TxID TransactionID
|
||
Nodes []string
|
||
Prepared map[string]bool
|
||
Committed map[string]bool
|
||
Status TxState
|
||
StartTime int64
|
||
Timeout time.Duration
|
||
}
|
||
|
||
// DistributedTransactionCoordinator координирует распределённые транзакции
|
||
type DistributedTransactionCoordinator struct {
|
||
pendingTxs sync.Map
|
||
timeout time.Duration
|
||
mu sync.RWMutex
|
||
}
|
||
|
||
// NewDistributedTransactionCoordinator создаёт новый координатор
|
||
func NewDistributedTransactionCoordinator(timeout time.Duration) *DistributedTransactionCoordinator {
|
||
if timeout <= 0 {
|
||
timeout = TwoPhaseCommitTimeout
|
||
}
|
||
return &DistributedTransactionCoordinator{timeout: timeout}
|
||
}
|
||
|
||
// Prepare подготавливает распределённую транзакцию
|
||
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
|
||
}
|
||
|
||
// VoteCommit получает голоса за коммит от узлов
|
||
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
|
||
}
|
||
|
||
// Commit коммитит распределённую транзакцию
|
||
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
|
||
}
|
||
|
||
// Abort откатывает распределённую транзакцию
|
||
func (dtc *DistributedTransactionCoordinator) Abort(txID TransactionID) error {
|
||
dtc.pendingTxs.Delete(txID)
|
||
return nil
|
||
}
|
||
|
||
// ========== Дополнительные функции для совместимости ==========
|
||
|
||
// MVCCSnapshot создаёт снапшот текущего состояния для MVCC
|
||
func MVCCSnapshot() uint64 {
|
||
return uint64(time.Now().UnixNano())
|
||
}
|
||
|
||
// CreateDocumentVersion создаёт новую версию документа для MVCC
|
||
func CreateDocumentVersion(doc *Document, txID TransactionID) *DocumentVersion {
|
||
return &DocumentVersion{
|
||
Document: doc.Clone(),
|
||
Timestamp: time.Now().UnixMilli(),
|
||
TxID: txID,
|
||
}
|
||
}
|