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:
549
internal/engine/mysqldump.go
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549
internal/engine/mysqldump.go
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@@ -0,0 +1,549 @@
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package engine
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import (
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"bufio"
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"compress/gzip"
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"context"
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"database/sql"
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"fmt"
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"io"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"dbbackup/internal/logger"
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"dbbackup/internal/metadata"
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"dbbackup/internal/security"
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)
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// MySQLDumpEngine implements BackupEngine using mysqldump
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type MySQLDumpEngine struct {
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db *sql.DB
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config *MySQLDumpConfig
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log logger.Logger
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}
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// MySQLDumpConfig contains mysqldump configuration
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type MySQLDumpConfig struct {
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// 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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Socket string
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// SSL
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SSLMode string
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Insecure bool
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// Dump options
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SingleTransaction bool
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Routines bool
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Triggers bool
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Events bool
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AddDropTable bool
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CreateOptions bool
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Quick bool
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LockTables bool
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FlushLogs bool
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MasterData int // 0 = disabled, 1 = CHANGE MASTER, 2 = commented
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// Parallel (for mydumper if available)
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Parallel int
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}
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// NewMySQLDumpEngine creates a new mysqldump engine
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func NewMySQLDumpEngine(db *sql.DB, config *MySQLDumpConfig, log logger.Logger) *MySQLDumpEngine {
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if config == nil {
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config = &MySQLDumpConfig{
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SingleTransaction: true,
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Routines: true,
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Triggers: true,
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Events: true,
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AddDropTable: true,
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CreateOptions: true,
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Quick: true,
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}
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}
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return &MySQLDumpEngine{
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db: db,
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config: config,
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log: log,
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}
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}
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// Name returns the engine name
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func (e *MySQLDumpEngine) Name() string {
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return "mysqldump"
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}
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// Description returns a human-readable description
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func (e *MySQLDumpEngine) Description() string {
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return "MySQL logical backup using mysqldump (universal compatibility)"
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}
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// CheckAvailability verifies mysqldump is available
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func (e *MySQLDumpEngine) CheckAvailability(ctx context.Context) (*AvailabilityResult, error) {
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result := &AvailabilityResult{
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Info: make(map[string]string),
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}
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// Check if mysqldump exists
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path, err := exec.LookPath("mysqldump")
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if err != nil {
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result.Available = false
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result.Reason = "mysqldump not found in PATH"
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return result, nil
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}
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result.Info["path"] = path
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// Get version
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cmd := exec.CommandContext(ctx, "mysqldump", "--version")
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output, err := cmd.Output()
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if err == nil {
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version := strings.TrimSpace(string(output))
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result.Info["version"] = version
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}
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// Check database connection
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if e.db != nil {
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if err := e.db.PingContext(ctx); err != nil {
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result.Available = false
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result.Reason = fmt.Sprintf("database connection failed: %v", err)
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return result, nil
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}
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}
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result.Available = true
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return result, nil
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}
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// Backup performs a mysqldump backup
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func (e *MySQLDumpEngine) Backup(ctx context.Context, opts *BackupOptions) (*BackupResult, error) {
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startTime := time.Now()
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e.log.Info("Starting mysqldump backup", "database", opts.Database)
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// Generate output filename if not specified
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outputFile := opts.OutputFile
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if outputFile == "" {
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timestamp := time.Now().Format("20060102_150405")
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ext := ".sql"
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if opts.Compress {
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ext = ".sql.gz"
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}
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outputFile = filepath.Join(opts.OutputDir, fmt.Sprintf("db_%s_%s%s", opts.Database, timestamp, ext))
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}
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// Ensure output directory exists
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if err := os.MkdirAll(filepath.Dir(outputFile), 0755); err != nil {
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return nil, fmt.Errorf("failed to create output directory: %w", err)
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}
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// Get binlog position before backup
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binlogFile, binlogPos, gtidSet := e.getBinlogPosition(ctx)
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// Build command
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args := e.buildArgs(opts.Database)
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e.log.Debug("Running mysqldump", "args", strings.Join(args, " "))
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// Execute mysqldump
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cmd := exec.CommandContext(ctx, "mysqldump", args...)
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// Set password via environment
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if e.config.Password != "" {
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cmd.Env = append(os.Environ(), "MYSQL_PWD="+e.config.Password)
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}
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// Get stdout pipe
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return nil, fmt.Errorf("failed to create stdout pipe: %w", err)
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}
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// Capture stderr for errors
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var stderrBuf strings.Builder
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cmd.Stderr = &stderrBuf
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// Start command
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if err := cmd.Start(); err != nil {
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return nil, fmt.Errorf("failed to start mysqldump: %w", err)
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}
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// Create output file
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outFile, err := os.Create(outputFile)
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if err != nil {
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cmd.Process.Kill()
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return nil, fmt.Errorf("failed to create output file: %w", err)
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}
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defer outFile.Close()
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// Setup writer (with optional compression)
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var writer io.Writer = outFile
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var gzWriter *gzip.Writer
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if opts.Compress {
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level := opts.CompressLevel
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if level == 0 {
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level = gzip.DefaultCompression
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}
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gzWriter, err = gzip.NewWriterLevel(outFile, level)
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if err != nil {
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return nil, fmt.Errorf("failed to create gzip writer: %w", err)
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}
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defer gzWriter.Close()
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writer = gzWriter
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}
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// Copy data with progress reporting
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var bytesWritten int64
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bufReader := bufio.NewReaderSize(stdout, 1024*1024) // 1MB buffer
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buf := make([]byte, 32*1024) // 32KB chunks
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for {
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n, err := bufReader.Read(buf)
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if n > 0 {
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if _, werr := writer.Write(buf[:n]); werr != nil {
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cmd.Process.Kill()
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return nil, fmt.Errorf("failed to write output: %w", werr)
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}
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bytesWritten += int64(n)
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// Report progress
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if opts.ProgressFunc != nil {
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opts.ProgressFunc(&Progress{
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Stage: "DUMPING",
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BytesDone: bytesWritten,
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Message: fmt.Sprintf("Dumped %s", formatBytes(bytesWritten)),
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})
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}
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}
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if err == io.EOF {
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break
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}
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if err != nil {
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return nil, fmt.Errorf("failed to read mysqldump output: %w", err)
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}
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}
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// Close gzip writer before checking command status
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if gzWriter != nil {
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gzWriter.Close()
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}
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// Wait for command
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if err := cmd.Wait(); err != nil {
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stderr := stderrBuf.String()
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return nil, fmt.Errorf("mysqldump failed: %w\n%s", err, stderr)
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}
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// Get file info
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fileInfo, err := os.Stat(outputFile)
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if err != nil {
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return nil, fmt.Errorf("failed to stat output file: %w", err)
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}
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// Calculate checksum
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checksum, err := security.ChecksumFile(outputFile)
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if err != nil {
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e.log.Warn("Failed to calculate checksum", "error", err)
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}
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// Save metadata
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meta := &metadata.BackupMetadata{
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Version: "3.1.0",
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Timestamp: startTime,
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Database: opts.Database,
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DatabaseType: "mysql",
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Host: e.config.Host,
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Port: e.config.Port,
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User: e.config.User,
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BackupFile: outputFile,
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SizeBytes: fileInfo.Size(),
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SHA256: checksum,
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BackupType: "full",
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ExtraInfo: make(map[string]string),
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}
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meta.ExtraInfo["backup_engine"] = "mysqldump"
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if opts.Compress {
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meta.Compression = opts.CompressFormat
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if meta.Compression == "" {
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meta.Compression = "gzip"
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}
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}
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if binlogFile != "" {
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meta.ExtraInfo["binlog_file"] = binlogFile
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meta.ExtraInfo["binlog_position"] = fmt.Sprintf("%d", binlogPos)
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meta.ExtraInfo["gtid_set"] = gtidSet
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}
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if err := meta.Save(); err != nil {
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e.log.Warn("Failed to save metadata", "error", err)
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}
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endTime := time.Now()
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result := &BackupResult{
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Engine: "mysqldump",
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Database: opts.Database,
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StartTime: startTime,
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EndTime: endTime,
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Duration: endTime.Sub(startTime),
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Files: []BackupFile{
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{
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Path: outputFile,
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Size: fileInfo.Size(),
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Checksum: checksum,
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},
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},
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TotalSize: fileInfo.Size(),
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BinlogFile: binlogFile,
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BinlogPos: binlogPos,
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GTIDExecuted: gtidSet,
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Metadata: map[string]string{
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"compress": strconv.FormatBool(opts.Compress),
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"checksum": checksum,
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"dump_bytes": strconv.FormatInt(bytesWritten, 10),
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},
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}
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e.log.Info("mysqldump backup completed",
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"database", opts.Database,
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"output", outputFile,
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"size", formatBytes(fileInfo.Size()),
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"duration", result.Duration)
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return result, nil
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}
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// Restore restores from a mysqldump backup
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func (e *MySQLDumpEngine) Restore(ctx context.Context, opts *RestoreOptions) error {
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e.log.Info("Starting mysqldump restore", "source", opts.SourcePath, "target", opts.TargetDB)
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// Build mysql command
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args := []string{}
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// Connection parameters
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if e.config.Host != "" && e.config.Host != "localhost" {
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args = append(args, "-h", e.config.Host)
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args = append(args, "-P", strconv.Itoa(e.config.Port))
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}
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args = append(args, "-u", e.config.User)
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// Database
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if opts.TargetDB != "" {
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args = append(args, opts.TargetDB)
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}
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// Build command
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cmd := exec.CommandContext(ctx, "mysql", args...)
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// Set password via environment
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if e.config.Password != "" {
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cmd.Env = append(os.Environ(), "MYSQL_PWD="+e.config.Password)
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}
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// Open input file
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inFile, err := os.Open(opts.SourcePath)
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if err != nil {
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return fmt.Errorf("failed to open input file: %w", err)
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}
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defer inFile.Close()
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// Setup reader (with optional decompression)
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var reader io.Reader = inFile
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if strings.HasSuffix(opts.SourcePath, ".gz") {
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gzReader, err := gzip.NewReader(inFile)
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if err != nil {
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return fmt.Errorf("failed to create gzip reader: %w", err)
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}
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defer gzReader.Close()
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reader = gzReader
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}
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cmd.Stdin = reader
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// Capture stderr
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var stderrBuf strings.Builder
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cmd.Stderr = &stderrBuf
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// Run
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if err := cmd.Run(); err != nil {
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stderr := stderrBuf.String()
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return fmt.Errorf("mysql restore failed: %w\n%s", err, stderr)
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}
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e.log.Info("mysqldump restore completed", "target", opts.TargetDB)
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return nil
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}
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// SupportsRestore returns true
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func (e *MySQLDumpEngine) SupportsRestore() bool {
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return true
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}
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// SupportsIncremental returns false (mysqldump doesn't support incremental)
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func (e *MySQLDumpEngine) SupportsIncremental() bool {
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return false
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}
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// SupportsStreaming returns true (can pipe output)
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func (e *MySQLDumpEngine) SupportsStreaming() bool {
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return true
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}
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// BackupToWriter implements StreamingEngine
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func (e *MySQLDumpEngine) BackupToWriter(ctx context.Context, w io.Writer, opts *BackupOptions) (*BackupResult, error) {
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startTime := time.Now()
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// Build command
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args := e.buildArgs(opts.Database)
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cmd := exec.CommandContext(ctx, "mysqldump", args...)
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// Set password
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if e.config.Password != "" {
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cmd.Env = append(os.Environ(), "MYSQL_PWD="+e.config.Password)
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}
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// Pipe stdout to writer
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return nil, err
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}
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var stderrBuf strings.Builder
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cmd.Stderr = &stderrBuf
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if err := cmd.Start(); err != nil {
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return nil, err
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}
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// Copy with optional compression
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var writer io.Writer = w
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var gzWriter *gzip.Writer
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if opts.Compress {
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gzWriter = gzip.NewWriter(w)
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defer gzWriter.Close()
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writer = gzWriter
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}
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bytesWritten, err := io.Copy(writer, stdout)
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if err != nil {
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cmd.Process.Kill()
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return nil, err
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}
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if gzWriter != nil {
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gzWriter.Close()
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}
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if err := cmd.Wait(); err != nil {
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return nil, fmt.Errorf("mysqldump failed: %w\n%s", err, stderrBuf.String())
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}
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return &BackupResult{
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Engine: "mysqldump",
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Database: opts.Database,
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StartTime: startTime,
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EndTime: time.Now(),
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Duration: time.Since(startTime),
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TotalSize: bytesWritten,
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}, nil
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}
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// buildArgs builds mysqldump command arguments
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func (e *MySQLDumpEngine) buildArgs(database string) []string {
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args := []string{}
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// Connection parameters
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if e.config.Host != "" && e.config.Host != "localhost" {
|
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args = append(args, "-h", e.config.Host)
|
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args = append(args, "-P", strconv.Itoa(e.config.Port))
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}
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args = append(args, "-u", e.config.User)
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// SSL
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if e.config.Insecure {
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args = append(args, "--skip-ssl")
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} else if e.config.SSLMode != "" {
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switch strings.ToLower(e.config.SSLMode) {
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case "require", "required":
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args = append(args, "--ssl-mode=REQUIRED")
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case "verify-ca":
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args = append(args, "--ssl-mode=VERIFY_CA")
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case "verify-full", "verify-identity":
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args = append(args, "--ssl-mode=VERIFY_IDENTITY")
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}
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}
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// Dump options
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if e.config.SingleTransaction {
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args = append(args, "--single-transaction")
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}
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if e.config.Routines {
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args = append(args, "--routines")
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}
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if e.config.Triggers {
|
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args = append(args, "--triggers")
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}
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if e.config.Events {
|
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args = append(args, "--events")
|
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}
|
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if e.config.Quick {
|
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args = append(args, "--quick")
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}
|
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if e.config.LockTables {
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args = append(args, "--lock-tables")
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}
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if e.config.FlushLogs {
|
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args = append(args, "--flush-logs")
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}
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if e.config.MasterData > 0 {
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args = append(args, fmt.Sprintf("--master-data=%d", e.config.MasterData))
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||||
}
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// Database
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args = append(args, database)
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return args
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}
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|
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// getBinlogPosition gets current binlog position
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||||
func (e *MySQLDumpEngine) getBinlogPosition(ctx context.Context) (string, int64, string) {
|
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if e.db == nil {
|
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return "", 0, ""
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}
|
||||
|
||||
rows, err := e.db.QueryContext(ctx, "SHOW MASTER STATUS")
|
||||
if err != nil {
|
||||
return "", 0, ""
|
||||
}
|
||||
defer rows.Close()
|
||||
|
||||
if rows.Next() {
|
||||
var file string
|
||||
var position int64
|
||||
var binlogDoDB, binlogIgnoreDB, gtidSet sql.NullString
|
||||
|
||||
cols, _ := rows.Columns()
|
||||
if len(cols) >= 5 {
|
||||
rows.Scan(&file, &position, &binlogDoDB, &binlogIgnoreDB, >idSet)
|
||||
} else {
|
||||
rows.Scan(&file, &position, &binlogDoDB, &binlogIgnoreDB)
|
||||
}
|
||||
|
||||
return file, position, gtidSet.String
|
||||
}
|
||||
|
||||
return "", 0, ""
|
||||
}
|
||||
|
||||
func init() {
|
||||
// Register mysqldump engine (will be initialized later with actual config)
|
||||
// This is just a placeholder registration
|
||||
}
|
||||
Reference in New Issue
Block a user