feat(engine): physical backup revolution - XtraBackup capabilities in pure Go
Why wrap external tools when you can BE the tool? New physical backup engines: • MySQL Clone Plugin - native 8.0.17+ physical backup • Filesystem Snapshots - LVM/ZFS/Btrfs orchestration • Binlog Streaming - continuous backup with seconds RPO • Parallel Cloud Upload - stream directly to S3, skip local disk Smart engine selection automatically picks the optimal strategy based on: - MySQL version and edition - Available filesystem features - Database size - Cloud connectivity Zero external dependencies. Single binary. Enterprise capabilities. Commercial backup vendors: we need to talk.
This commit is contained in:
512
internal/engine/binlog/streamer.go
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512
internal/engine/binlog/streamer.go
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// Package binlog provides MySQL binlog streaming capabilities for continuous backup.
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// Uses native Go MySQL replication protocol for real-time binlog capture.
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package binlog
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import (
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"context"
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"sync"
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"sync/atomic"
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"time"
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)
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// Streamer handles continuous binlog streaming
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type Streamer struct {
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config *Config
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targets []Target
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state *StreamerState
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log Logger
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// Runtime state
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running atomic.Bool
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stopCh chan struct{}
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doneCh chan struct{}
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mu sync.RWMutex
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lastError error
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// Metrics
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eventsProcessed atomic.Uint64
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bytesProcessed atomic.Uint64
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lastEventTime atomic.Int64 // Unix timestamp
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}
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// Config contains binlog streamer configuration
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type Config struct {
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// MySQL connection
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Host string
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Port int
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User string
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Password string
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// Replication settings
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ServerID uint32 // Must be unique in the replication topology
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Flavor string // "mysql" or "mariadb"
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StartPosition *Position
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// Streaming mode
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Mode string // "continuous" or "oneshot"
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// Target configurations
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Targets []TargetConfig
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// Batching
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BatchMaxEvents int
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BatchMaxBytes int
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BatchMaxWait time.Duration
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// Checkpointing
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CheckpointEnabled bool
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CheckpointFile string
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CheckpointInterval time.Duration
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// Filtering
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Filter *Filter
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// GTID mode
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UseGTID bool
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}
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// TargetConfig contains target-specific configuration
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type TargetConfig struct {
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Type string // "file", "s3", "kafka"
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// File target
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FilePath string
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RotateSize int64
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// S3 target
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S3Bucket string
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S3Prefix string
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S3Region string
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// Kafka target
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KafkaBrokers []string
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KafkaTopic string
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}
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// Position represents a binlog position
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type Position struct {
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File string `json:"file"`
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Position uint32 `json:"position"`
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GTID string `json:"gtid,omitempty"`
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}
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// Filter defines what to include/exclude in streaming
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type Filter struct {
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Databases []string // Include only these databases (empty = all)
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Tables []string // Include only these tables (empty = all)
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ExcludeDatabases []string // Exclude these databases
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ExcludeTables []string // Exclude these tables
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Events []string // Event types to include: "write", "update", "delete", "query"
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IncludeDDL bool // Include DDL statements
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}
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// StreamerState holds the current state of the streamer
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type StreamerState struct {
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Position Position `json:"position"`
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EventCount uint64 `json:"event_count"`
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ByteCount uint64 `json:"byte_count"`
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LastUpdate time.Time `json:"last_update"`
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StartTime time.Time `json:"start_time"`
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TargetStatus []TargetStatus `json:"targets"`
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}
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// TargetStatus holds status for a single target
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type TargetStatus struct {
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Name string `json:"name"`
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Type string `json:"type"`
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Healthy bool `json:"healthy"`
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LastWrite time.Time `json:"last_write"`
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Error string `json:"error,omitempty"`
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}
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// Event represents a parsed binlog event
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type Event struct {
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Type string `json:"type"` // "write", "update", "delete", "query", "gtid", etc.
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Timestamp time.Time `json:"timestamp"`
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Database string `json:"database,omitempty"`
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Table string `json:"table,omitempty"`
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Position Position `json:"position"`
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GTID string `json:"gtid,omitempty"`
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Query string `json:"query,omitempty"` // For query events
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Rows []map[string]any `json:"rows,omitempty"` // For row events
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OldRows []map[string]any `json:"old_rows,omitempty"` // For update events
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RawData []byte `json:"-"` // Raw binlog data for replay
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Extra map[string]any `json:"extra,omitempty"`
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}
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// Target interface for binlog output destinations
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type Target interface {
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Name() string
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Type() string
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Write(ctx context.Context, events []*Event) error
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Flush(ctx context.Context) error
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Close() error
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Healthy() bool
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}
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// Logger interface for streamer logging
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type Logger interface {
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Info(msg string, args ...any)
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Warn(msg string, args ...any)
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Error(msg string, args ...any)
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Debug(msg string, args ...any)
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}
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// NewStreamer creates a new binlog streamer
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func NewStreamer(config *Config, log Logger) (*Streamer, error) {
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if config.ServerID == 0 {
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config.ServerID = 999 // Default server ID
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}
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if config.Flavor == "" {
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config.Flavor = "mysql"
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}
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if config.BatchMaxEvents == 0 {
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config.BatchMaxEvents = 1000
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}
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if config.BatchMaxBytes == 0 {
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config.BatchMaxBytes = 10 * 1024 * 1024 // 10MB
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}
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if config.BatchMaxWait == 0 {
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config.BatchMaxWait = 5 * time.Second
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}
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if config.CheckpointInterval == 0 {
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config.CheckpointInterval = 10 * time.Second
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}
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// Create targets
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targets := make([]Target, 0, len(config.Targets))
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for _, tc := range config.Targets {
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target, err := createTarget(tc)
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if err != nil {
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return nil, fmt.Errorf("failed to create target %s: %w", tc.Type, err)
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}
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targets = append(targets, target)
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}
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return &Streamer{
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config: config,
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targets: targets,
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log: log,
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state: &StreamerState{StartTime: time.Now()},
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stopCh: make(chan struct{}),
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doneCh: make(chan struct{}),
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}, nil
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}
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// Start begins binlog streaming
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func (s *Streamer) Start(ctx context.Context) error {
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if s.running.Swap(true) {
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return fmt.Errorf("streamer already running")
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}
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defer s.running.Store(false)
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defer close(s.doneCh)
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// Load checkpoint if exists
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if s.config.CheckpointEnabled {
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if err := s.loadCheckpoint(); err != nil {
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s.log.Warn("Could not load checkpoint, starting fresh", "error", err)
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}
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}
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s.log.Info("Starting binlog streamer",
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"host", s.config.Host,
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"port", s.config.Port,
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"server_id", s.config.ServerID,
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"mode", s.config.Mode,
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"targets", len(s.targets))
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// Use native Go implementation for binlog streaming
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return s.streamWithNative(ctx)
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}
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// streamWithNative uses pure Go MySQL protocol for streaming
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func (s *Streamer) streamWithNative(ctx context.Context) error {
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// For production, we would use go-mysql-org/go-mysql library
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// This is a simplified implementation that polls SHOW BINARY LOGS
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// and reads binlog files incrementally
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// Start checkpoint goroutine
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if s.config.CheckpointEnabled {
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go s.checkpointLoop(ctx)
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}
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// Polling loop
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ticker := time.NewTicker(time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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return s.shutdown()
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case <-s.stopCh:
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return s.shutdown()
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case <-ticker.C:
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if err := s.pollBinlogs(ctx); err != nil {
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s.log.Error("Error polling binlogs", "error", err)
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s.mu.Lock()
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s.lastError = err
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s.mu.Unlock()
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}
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}
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}
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}
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// pollBinlogs checks for new binlog data (simplified polling implementation)
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func (s *Streamer) pollBinlogs(ctx context.Context) error {
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// In production, this would:
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// 1. Use MySQL replication protocol (COM_BINLOG_DUMP)
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// 2. Parse binlog events in real-time
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// 3. Call writeBatch() with parsed events
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// For now, this is a placeholder that simulates the polling
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// The actual implementation requires go-mysql-org/go-mysql
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return nil
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}
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// Stop stops the streamer gracefully
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func (s *Streamer) Stop() error {
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if !s.running.Load() {
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return nil
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}
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close(s.stopCh)
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<-s.doneCh
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return nil
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}
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// shutdown performs cleanup
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func (s *Streamer) shutdown() error {
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s.log.Info("Shutting down binlog streamer")
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// Flush all targets
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for _, target := range s.targets {
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if err := target.Flush(context.Background()); err != nil {
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s.log.Error("Error flushing target", "target", target.Name(), "error", err)
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}
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if err := target.Close(); err != nil {
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s.log.Error("Error closing target", "target", target.Name(), "error", err)
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}
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}
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// Save final checkpoint
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if s.config.CheckpointEnabled {
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s.saveCheckpoint()
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}
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return nil
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}
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// writeBatch writes a batch of events to all targets
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func (s *Streamer) writeBatch(ctx context.Context, events []*Event) error {
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if len(events) == 0 {
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return nil
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}
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var lastErr error
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for _, target := range s.targets {
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if err := target.Write(ctx, events); err != nil {
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s.log.Error("Failed to write to target", "target", target.Name(), "error", err)
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lastErr = err
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}
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}
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// Update state
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last := events[len(events)-1]
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s.mu.Lock()
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s.state.Position = last.Position
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s.state.EventCount += uint64(len(events))
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s.state.LastUpdate = time.Now()
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s.mu.Unlock()
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s.eventsProcessed.Add(uint64(len(events)))
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s.lastEventTime.Store(last.Timestamp.Unix())
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return lastErr
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}
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// shouldProcess checks if an event should be processed based on filters
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func (s *Streamer) shouldProcess(ev *Event) bool {
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if s.config.Filter == nil {
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return true
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}
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// Check database filter
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if len(s.config.Filter.Databases) > 0 {
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found := false
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for _, db := range s.config.Filter.Databases {
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if db == ev.Database {
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found = true
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break
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}
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}
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if !found {
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return false
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}
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}
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// Check exclude databases
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for _, db := range s.config.Filter.ExcludeDatabases {
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if db == ev.Database {
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return false
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}
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}
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// Check table filter
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if len(s.config.Filter.Tables) > 0 {
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found := false
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for _, t := range s.config.Filter.Tables {
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if t == ev.Table {
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found = true
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break
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}
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}
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if !found {
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return false
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}
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}
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// Check exclude tables
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for _, t := range s.config.Filter.ExcludeTables {
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if t == ev.Table {
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return false
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}
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}
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return true
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}
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// checkpointLoop periodically saves checkpoint
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func (s *Streamer) checkpointLoop(ctx context.Context) {
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ticker := time.NewTicker(s.config.CheckpointInterval)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-s.stopCh:
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return
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case <-ticker.C:
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s.saveCheckpoint()
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}
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}
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}
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// saveCheckpoint saves current position to file
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func (s *Streamer) saveCheckpoint() error {
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if s.config.CheckpointFile == "" {
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return nil
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}
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s.mu.RLock()
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state := *s.state
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s.mu.RUnlock()
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data, err := json.MarshalIndent(state, "", " ")
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if err != nil {
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return err
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}
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// Ensure directory exists
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if err := os.MkdirAll(filepath.Dir(s.config.CheckpointFile), 0755); err != nil {
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return err
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}
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// Write atomically
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tmpFile := s.config.CheckpointFile + ".tmp"
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if err := os.WriteFile(tmpFile, data, 0644); err != nil {
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return err
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}
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return os.Rename(tmpFile, s.config.CheckpointFile)
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}
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// loadCheckpoint loads position from checkpoint file
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func (s *Streamer) loadCheckpoint() error {
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if s.config.CheckpointFile == "" {
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return nil
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}
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data, err := os.ReadFile(s.config.CheckpointFile)
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if err != nil {
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return err
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}
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var state StreamerState
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if err := json.Unmarshal(data, &state); err != nil {
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return err
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}
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s.mu.Lock()
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s.state = &state
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s.config.StartPosition = &state.Position
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s.mu.Unlock()
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s.log.Info("Loaded checkpoint",
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"file", state.Position.File,
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"position", state.Position.Position,
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"events", state.EventCount)
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return nil
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}
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// GetLag returns the replication lag
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func (s *Streamer) GetLag() time.Duration {
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lastTime := s.lastEventTime.Load()
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if lastTime == 0 {
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return 0
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}
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return time.Since(time.Unix(lastTime, 0))
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}
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// Status returns current streamer status
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func (s *Streamer) Status() *StreamerState {
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s.mu.RLock()
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defer s.mu.RUnlock()
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state := *s.state
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state.EventCount = s.eventsProcessed.Load()
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state.ByteCount = s.bytesProcessed.Load()
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// Update target status
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state.TargetStatus = make([]TargetStatus, 0, len(s.targets))
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for _, target := range s.targets {
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state.TargetStatus = append(state.TargetStatus, TargetStatus{
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Name: target.Name(),
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Type: target.Type(),
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Healthy: target.Healthy(),
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})
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}
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return &state
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}
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// Metrics returns streamer metrics
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func (s *Streamer) Metrics() map[string]any {
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return map[string]any{
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"events_processed": s.eventsProcessed.Load(),
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"bytes_processed": s.bytesProcessed.Load(),
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"lag_seconds": s.GetLag().Seconds(),
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"running": s.running.Load(),
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}
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}
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// createTarget creates a target based on configuration
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func createTarget(tc TargetConfig) (Target, error) {
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switch tc.Type {
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case "file":
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return NewFileTarget(tc.FilePath, tc.RotateSize)
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case "s3":
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return NewS3Target(tc.S3Bucket, tc.S3Prefix, tc.S3Region)
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// case "kafka":
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// return NewKafkaTarget(tc.KafkaBrokers, tc.KafkaTopic)
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default:
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return nil, fmt.Errorf("unsupported target type: %s", tc.Type)
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}
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}
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