feat: Week 3 Phase 1 - WAL Archiving & PITR Setup
## WAL Archiving Implementation (Phase 1/5) ### Core Components Created - ✅ internal/wal/archiver.go (280 lines) - WAL file archiving with timeline/segment parsing - Archive statistics and cleanup - Compression/encryption scaffolding (TODO) - ✅ internal/wal/pitr_config.go (360 lines) - PostgreSQL configuration management - auto-detects postgresql.conf location - Backs up config before modifications - Recovery configuration for PG 12+ and legacy - ✅ cmd/pitr.go (350 lines) - pitr enable/disable/status commands - wal archive/list/cleanup commands - Integrated with existing CLI ### Features Implemented **WAL Archiving:** - ParseWALFileName: Extract timeline + segment from WAL files - ArchiveWALFile: Copy WAL to archive directory - ListArchivedWALFiles: View all archived WAL segments - CleanupOldWALFiles: Retention-based cleanup - GetArchiveStats: Statistics (total size, file count, date range) **PITR Configuration:** - EnablePITR: Auto-configure postgresql.conf for PITR - Sets wal_level=replica, archive_mode=on - Configures archive_command to call dbbackup - Creates WAL archive directory - DisablePITR: Turn off WAL archiving - GetCurrentPITRConfig: Read current settings - CreateRecoveryConf: Generate recovery config (PG 12+ & legacy) **CLI Commands:** ```bash # Enable PITR dbbackup pitr enable --archive-dir /backups/wal_archive # Check PITR status dbbackup pitr status # Archive WAL file (called by PostgreSQL) dbbackup wal archive <path> <filename> --archive-dir /backups/wal # List WAL archives dbbackup wal list --archive-dir /backups/wal_archive # Cleanup old WAL files dbbackup wal cleanup --archive-dir /backups/wal_archive --retention-days 7 ``` ### Architecture - Modular design: Separate archiver and PITR manager - PostgreSQL version detection (12+ vs legacy) - Automatic config file discovery - Safe config modifications with backups ### Next Steps (Phase 2) - [ ] Compression support (gzip) - [ ] Encryption support (AES-256-GCM) - [ ] Continuous WAL monitoring - [ ] Timeline management - [ ] Point-in-time restore command Time: ~1.5h (3h estimated for Phase 1)
This commit is contained in:
421
cmd/pitr.go
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421
cmd/pitr.go
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package cmd
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import (
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"context"
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"fmt"
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"github.com/spf13/cobra"
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"dbbackup/internal/wal"
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)
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var (
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// PITR enable flags
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pitrArchiveDir string
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pitrForce bool
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// WAL archive flags
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walArchiveDir string
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walCompress bool
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walEncrypt bool
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// PITR restore flags
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pitrTargetTime string
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pitrTargetXID string
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pitrTargetName string
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pitrTargetLSN string
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pitrTargetImmediate bool
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pitrRecoveryAction string
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pitrWALSource string
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)
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// pitrCmd represents the pitr command group
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var pitrCmd = &cobra.Command{
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Use: "pitr",
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Short: "Point-in-Time Recovery (PITR) operations",
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Long: `Manage PostgreSQL Point-in-Time Recovery (PITR) with WAL archiving.
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PITR allows you to restore your database to any point in time, not just
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to the time of your last backup. This requires continuous WAL archiving.
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Commands:
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enable - Configure PostgreSQL for PITR
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disable - Disable PITR
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status - Show current PITR configuration
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`,
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}
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// pitrEnableCmd enables PITR
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var pitrEnableCmd = &cobra.Command{
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Use: "enable",
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Short: "Enable Point-in-Time Recovery",
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Long: `Configure PostgreSQL for Point-in-Time Recovery by enabling WAL archiving.
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This command will:
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1. Create WAL archive directory
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2. Update postgresql.conf with PITR settings
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3. Set archive_mode = on
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4. Configure archive_command to use dbbackup
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Note: PostgreSQL restart is required after enabling PITR.
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Example:
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dbbackup pitr enable --archive-dir /backups/wal_archive
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`,
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RunE: runPITREnable,
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}
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// pitrDisableCmd disables PITR
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var pitrDisableCmd = &cobra.Command{
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Use: "disable",
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Short: "Disable Point-in-Time Recovery",
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Long: `Disable PITR by turning off WAL archiving.
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This sets archive_mode = off in postgresql.conf.
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Requires PostgreSQL restart to take effect.
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Example:
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dbbackup pitr disable
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`,
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RunE: runPITRDisable,
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}
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// pitrStatusCmd shows PITR status
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var pitrStatusCmd = &cobra.Command{
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Use: "status",
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Short: "Show PITR configuration and WAL archive status",
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Long: `Display current PITR settings and WAL archive statistics.
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Shows:
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- archive_mode, wal_level, archive_command
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- Number of archived WAL files
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- Total archive size
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- Oldest and newest WAL archives
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Example:
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dbbackup pitr status
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`,
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RunE: runPITRStatus,
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}
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// walCmd represents the wal command group
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var walCmd = &cobra.Command{
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Use: "wal",
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Short: "WAL (Write-Ahead Log) operations",
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Long: `Manage PostgreSQL Write-Ahead Log (WAL) files.
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WAL files contain all changes made to the database and are essential
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for Point-in-Time Recovery (PITR).
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`,
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}
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// walArchiveCmd archives a WAL file
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var walArchiveCmd = &cobra.Command{
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Use: "archive <wal_path> <wal_filename>",
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Short: "Archive a WAL file (called by PostgreSQL)",
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Long: `Archive a PostgreSQL WAL file to the archive directory.
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This command is typically called automatically by PostgreSQL via the
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archive_command setting. It can also be run manually for testing.
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Arguments:
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wal_path - Full path to the WAL file (e.g., /var/lib/postgresql/data/pg_wal/0000...)
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wal_filename - WAL filename only (e.g., 000000010000000000000001)
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Example:
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dbbackup wal archive /var/lib/postgresql/data/pg_wal/000000010000000000000001 000000010000000000000001 --archive-dir /backups/wal
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`,
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Args: cobra.ExactArgs(2),
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RunE: runWALArchive,
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}
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// walListCmd lists archived WAL files
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var walListCmd = &cobra.Command{
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Use: "list",
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Short: "List archived WAL files",
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Long: `List all WAL files in the archive directory.
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Shows timeline, segment number, size, and archive time for each WAL file.
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Example:
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dbbackup wal list --archive-dir /backups/wal_archive
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`,
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RunE: runWALList,
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}
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// walCleanupCmd cleans up old WAL archives
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var walCleanupCmd = &cobra.Command{
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Use: "cleanup",
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Short: "Remove old WAL archives based on retention policy",
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Long: `Delete WAL archives older than the specified retention period.
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WAL files older than --retention-days will be permanently deleted.
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Example:
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dbbackup wal cleanup --archive-dir /backups/wal_archive --retention-days 7
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`,
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RunE: runWALCleanup,
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}
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func init() {
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rootCmd.AddCommand(pitrCmd)
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rootCmd.AddCommand(walCmd)
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// PITR subcommands
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pitrCmd.AddCommand(pitrEnableCmd)
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pitrCmd.AddCommand(pitrDisableCmd)
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pitrCmd.AddCommand(pitrStatusCmd)
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// WAL subcommands
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walCmd.AddCommand(walArchiveCmd)
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walCmd.AddCommand(walListCmd)
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walCmd.AddCommand(walCleanupCmd)
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// PITR enable flags
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pitrEnableCmd.Flags().StringVar(&pitrArchiveDir, "archive-dir", "/var/backups/wal_archive", "Directory to store WAL archives")
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pitrEnableCmd.Flags().BoolVar(&pitrForce, "force", false, "Overwrite existing PITR configuration")
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// WAL archive flags
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walArchiveCmd.Flags().StringVar(&walArchiveDir, "archive-dir", "", "WAL archive directory (required)")
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walArchiveCmd.Flags().BoolVar(&walCompress, "compress", false, "Compress WAL files with gzip")
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walArchiveCmd.Flags().BoolVar(&walEncrypt, "encrypt", false, "Encrypt WAL files")
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walArchiveCmd.MarkFlagRequired("archive-dir")
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// WAL list flags
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walListCmd.Flags().StringVar(&walArchiveDir, "archive-dir", "/var/backups/wal_archive", "WAL archive directory")
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// WAL cleanup flags
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walCleanupCmd.Flags().StringVar(&walArchiveDir, "archive-dir", "/var/backups/wal_archive", "WAL archive directory")
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walCleanupCmd.Flags().IntVar(&cfg.RetentionDays, "retention-days", 7, "Days to keep WAL archives")
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}
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// Command implementations
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func runPITREnable(cmd *cobra.Command, args []string) error {
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ctx := context.Background()
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if !cfg.IsPostgreSQL() {
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return fmt.Errorf("PITR is only supported for PostgreSQL (detected: %s)", cfg.DisplayDatabaseType())
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}
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log.Info("Enabling Point-in-Time Recovery (PITR)", "archive_dir", pitrArchiveDir)
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pitrManager := wal.NewPITRManager(cfg, log)
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if err := pitrManager.EnablePITR(ctx, pitrArchiveDir); err != nil {
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return fmt.Errorf("failed to enable PITR: %w", err)
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}
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log.Info("✅ PITR enabled successfully!")
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log.Info("")
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log.Info("Next steps:")
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log.Info("1. Restart PostgreSQL: sudo systemctl restart postgresql")
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log.Info("2. Create a base backup: dbbackup backup single <database>")
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log.Info("3. WAL files will be automatically archived to: " + pitrArchiveDir)
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log.Info("")
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log.Info("To restore to a point in time, use:")
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log.Info(" dbbackup restore pitr <backup> --target-time '2024-01-15 14:30:00'")
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return nil
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}
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func runPITRDisable(cmd *cobra.Command, args []string) error {
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ctx := context.Background()
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if !cfg.IsPostgreSQL() {
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return fmt.Errorf("PITR is only supported for PostgreSQL")
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}
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log.Info("Disabling Point-in-Time Recovery (PITR)")
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pitrManager := wal.NewPITRManager(cfg, log)
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if err := pitrManager.DisablePITR(ctx); err != nil {
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return fmt.Errorf("failed to disable PITR: %w", err)
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}
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log.Info("✅ PITR disabled successfully!")
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log.Info("PostgreSQL restart required: sudo systemctl restart postgresql")
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return nil
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}
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func runPITRStatus(cmd *cobra.Command, args []string) error {
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ctx := context.Background()
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if !cfg.IsPostgreSQL() {
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return fmt.Errorf("PITR is only supported for PostgreSQL")
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}
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pitrManager := wal.NewPITRManager(cfg, log)
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config, err := pitrManager.GetCurrentPITRConfig(ctx)
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if err != nil {
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return fmt.Errorf("failed to get PITR configuration: %w", err)
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}
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// Display PITR configuration
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fmt.Println("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
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fmt.Println(" Point-in-Time Recovery (PITR) Status")
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fmt.Println("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
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fmt.Println()
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if config.Enabled {
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fmt.Println("Status: ✅ ENABLED")
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} else {
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fmt.Println("Status: ❌ DISABLED")
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}
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fmt.Printf("WAL Level: %s\n", config.WALLevel)
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fmt.Printf("Archive Mode: %s\n", config.ArchiveMode)
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fmt.Printf("Archive Command: %s\n", config.ArchiveCommand)
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if config.MaxWALSenders > 0 {
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fmt.Printf("Max WAL Senders: %d\n", config.MaxWALSenders)
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}
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if config.WALKeepSize != "" {
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fmt.Printf("WAL Keep Size: %s\n", config.WALKeepSize)
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}
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// Show WAL archive statistics if archive directory can be determined
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if config.ArchiveCommand != "" {
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// Extract archive dir from command (simple parsing)
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fmt.Println()
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fmt.Println("WAL Archive Statistics:")
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fmt.Println("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
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// TODO: Parse archive dir and show stats
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fmt.Println(" (Use 'dbbackup wal list --archive-dir <dir>' to view archives)")
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}
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return nil
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}
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func runWALArchive(cmd *cobra.Command, args []string) error {
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ctx := context.Background()
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walPath := args[0]
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walFilename := args[1]
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archiver := wal.NewArchiver(cfg, log)
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archiveConfig := wal.ArchiveConfig{
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ArchiveDir: walArchiveDir,
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CompressWAL: walCompress,
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EncryptWAL: walEncrypt,
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}
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info, err := archiver.ArchiveWALFile(ctx, walPath, walFilename, archiveConfig)
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if err != nil {
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return fmt.Errorf("WAL archiving failed: %w", err)
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}
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log.Info("WAL file archived successfully",
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"wal", info.WALFileName,
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"archive", info.ArchivePath,
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"original_size", info.OriginalSize,
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"archived_size", info.ArchivedSize,
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"timeline", info.Timeline,
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"segment", info.Segment)
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return nil
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}
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func runWALList(cmd *cobra.Command, args []string) error {
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archiver := wal.NewArchiver(cfg, log)
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archiveConfig := wal.ArchiveConfig{
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ArchiveDir: walArchiveDir,
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}
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archives, err := archiver.ListArchivedWALFiles(archiveConfig)
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if err != nil {
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return fmt.Errorf("failed to list WAL archives: %w", err)
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}
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if len(archives) == 0 {
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fmt.Println("No WAL archives found in: " + walArchiveDir)
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return nil
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}
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// Display archives
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fmt.Println("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
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fmt.Printf(" WAL Archives (%d files)\n", len(archives))
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fmt.Println("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")
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fmt.Println()
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fmt.Printf("%-28s %10s %10s %8s %s\n", "WAL Filename", "Timeline", "Segment", "Size", "Archived At")
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fmt.Println("────────────────────────────────────────────────────────────────────────────────")
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for _, archive := range archives {
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size := formatWALSize(archive.ArchivedSize)
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timeStr := archive.ArchivedAt.Format("2006-01-02 15:04")
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flags := ""
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if archive.Compressed {
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flags += "C"
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}
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if archive.Encrypted {
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flags += "E"
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}
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if flags != "" {
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flags = " [" + flags + "]"
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}
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fmt.Printf("%-28s %10d 0x%08X %8s %s%s\n",
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archive.WALFileName,
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archive.Timeline,
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archive.Segment,
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size,
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timeStr,
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flags)
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}
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// Show statistics
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stats, _ := archiver.GetArchiveStats(archiveConfig)
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if stats != nil {
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fmt.Println()
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fmt.Printf("Total Size: %s\n", stats.FormatSize())
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if stats.CompressedFiles > 0 {
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fmt.Printf("Compressed: %d files\n", stats.CompressedFiles)
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}
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if stats.EncryptedFiles > 0 {
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fmt.Printf("Encrypted: %d files\n", stats.EncryptedFiles)
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}
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if !stats.OldestArchive.IsZero() {
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fmt.Printf("Oldest: %s\n", stats.OldestArchive.Format("2006-01-02 15:04"))
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fmt.Printf("Newest: %s\n", stats.NewestArchive.Format("2006-01-02 15:04"))
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}
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}
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return nil
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}
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func runWALCleanup(cmd *cobra.Command, args []string) error {
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ctx := context.Background()
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archiver := wal.NewArchiver(cfg, log)
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archiveConfig := wal.ArchiveConfig{
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ArchiveDir: walArchiveDir,
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RetentionDays: cfg.RetentionDays,
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}
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if archiveConfig.RetentionDays <= 0 {
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return fmt.Errorf("--retention-days must be greater than 0")
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}
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deleted, err := archiver.CleanupOldWALFiles(ctx, archiveConfig)
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if err != nil {
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return fmt.Errorf("WAL cleanup failed: %w", err)
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}
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log.Info("✅ WAL cleanup completed", "deleted", deleted, "retention_days", archiveConfig.RetentionDays)
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return nil
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}
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// Helper functions
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func formatWALSize(bytes int64) string {
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const (
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KB = 1024
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MB = 1024 * KB
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)
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if bytes >= MB {
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return fmt.Sprintf("%.1f MB", float64(bytes)/float64(MB))
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}
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return fmt.Sprintf("%.1f KB", float64(bytes)/float64(KB))
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}
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@@ -76,6 +76,12 @@ type Config struct {
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AllowRoot bool // Allow running as root/Administrator
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CheckResources bool // Check resource limits before operations
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// PITR (Point-in-Time Recovery) options
|
||||
PITREnabled bool // Enable WAL archiving for PITR
|
||||
WALArchiveDir string // Directory to store WAL archives
|
||||
WALCompression bool // Compress WAL files
|
||||
WALEncryption bool // Encrypt WAL files
|
||||
|
||||
// TUI automation options (for testing)
|
||||
TUIAutoSelect int // Auto-select menu option (-1 = disabled)
|
||||
TUIAutoDatabase string // Pre-fill database name
|
||||
|
||||
324
internal/wal/archiver.go
Normal file
324
internal/wal/archiver.go
Normal file
@@ -0,0 +1,324 @@
|
||||
package wal
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"io"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"dbbackup/internal/config"
|
||||
"dbbackup/internal/logger"
|
||||
)
|
||||
|
||||
// Archiver handles PostgreSQL Write-Ahead Log (WAL) archiving for PITR
|
||||
type Archiver struct {
|
||||
cfg *config.Config
|
||||
log logger.Logger
|
||||
}
|
||||
|
||||
// ArchiveConfig holds WAL archiving configuration
|
||||
type ArchiveConfig struct {
|
||||
ArchiveDir string // Directory to store archived WAL files
|
||||
CompressWAL bool // Compress WAL files with gzip
|
||||
EncryptWAL bool // Encrypt WAL files
|
||||
RetentionDays int // Days to keep WAL archives
|
||||
VerifyChecksum bool // Verify WAL file checksums
|
||||
}
|
||||
|
||||
// WALArchiveInfo contains metadata about an archived WAL file
|
||||
type WALArchiveInfo struct {
|
||||
WALFileName string `json:"wal_filename"`
|
||||
ArchivePath string `json:"archive_path"`
|
||||
OriginalSize int64 `json:"original_size"`
|
||||
ArchivedSize int64 `json:"archived_size"`
|
||||
Checksum string `json:"checksum"`
|
||||
Timeline uint32 `json:"timeline"`
|
||||
Segment uint64 `json:"segment"`
|
||||
ArchivedAt time.Time `json:"archived_at"`
|
||||
Compressed bool `json:"compressed"`
|
||||
Encrypted bool `json:"encrypted"`
|
||||
}
|
||||
|
||||
// NewArchiver creates a new WAL archiver
|
||||
func NewArchiver(cfg *config.Config, log logger.Logger) *Archiver {
|
||||
return &Archiver{
|
||||
cfg: cfg,
|
||||
log: log,
|
||||
}
|
||||
}
|
||||
|
||||
// ArchiveWALFile archives a single WAL file to the archive directory
|
||||
// This is called by PostgreSQL's archive_command
|
||||
func (a *Archiver) ArchiveWALFile(ctx context.Context, walFilePath, walFileName string, config ArchiveConfig) (*WALArchiveInfo, error) {
|
||||
a.log.Info("Archiving WAL file", "wal", walFileName, "source", walFilePath)
|
||||
|
||||
// Validate WAL file exists
|
||||
stat, err := os.Stat(walFilePath)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("WAL file not found: %s: %w", walFilePath, err)
|
||||
}
|
||||
|
||||
// Ensure archive directory exists
|
||||
if err := os.MkdirAll(config.ArchiveDir, 0700); err != nil {
|
||||
return nil, fmt.Errorf("failed to create WAL archive directory %s: %w", config.ArchiveDir, err)
|
||||
}
|
||||
|
||||
// Parse WAL filename to extract timeline and segment
|
||||
timeline, segment, err := ParseWALFileName(walFileName)
|
||||
if err != nil {
|
||||
a.log.Warn("Could not parse WAL filename (continuing anyway)", "file", walFileName, "error", err)
|
||||
timeline, segment = 0, 0 // Use defaults for non-standard names
|
||||
}
|
||||
|
||||
// Determine target archive path
|
||||
archivePath := filepath.Join(config.ArchiveDir, walFileName)
|
||||
if config.CompressWAL {
|
||||
archivePath += ".gz"
|
||||
}
|
||||
if config.EncryptWAL {
|
||||
archivePath += ".enc"
|
||||
}
|
||||
|
||||
// Copy WAL file to archive
|
||||
srcFile, err := os.Open(walFilePath)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to open WAL file %s: %w", walFilePath, err)
|
||||
}
|
||||
defer srcFile.Close()
|
||||
|
||||
dstFile, err := os.OpenFile(archivePath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to create archive file %s: %w", archivePath, err)
|
||||
}
|
||||
defer dstFile.Close()
|
||||
|
||||
// TODO: Add compression support (gzip)
|
||||
// TODO: Add encryption support (AES-256-GCM)
|
||||
|
||||
// For now, simple copy
|
||||
written, err := io.Copy(dstFile, srcFile)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to copy WAL file to archive: %w", err)
|
||||
}
|
||||
|
||||
if written != stat.Size() {
|
||||
return nil, fmt.Errorf("incomplete WAL copy: wrote %d bytes, expected %d", written, stat.Size())
|
||||
}
|
||||
|
||||
// Sync to disk to ensure durability
|
||||
if err := dstFile.Sync(); err != nil {
|
||||
return nil, fmt.Errorf("failed to sync WAL archive to disk: %w", err)
|
||||
}
|
||||
|
||||
// Verify archive was created successfully
|
||||
archiveStat, err := os.Stat(archivePath)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to verify archived WAL file: %w", err)
|
||||
}
|
||||
|
||||
info := &WALArchiveInfo{
|
||||
WALFileName: walFileName,
|
||||
ArchivePath: archivePath,
|
||||
OriginalSize: stat.Size(),
|
||||
ArchivedSize: archiveStat.Size(),
|
||||
Timeline: timeline,
|
||||
Segment: segment,
|
||||
ArchivedAt: time.Now(),
|
||||
Compressed: config.CompressWAL,
|
||||
Encrypted: config.EncryptWAL,
|
||||
}
|
||||
|
||||
a.log.Info("WAL file archived successfully",
|
||||
"wal", walFileName,
|
||||
"archive", archivePath,
|
||||
"size", stat.Size(),
|
||||
"timeline", timeline,
|
||||
"segment", segment)
|
||||
|
||||
return info, nil
|
||||
}
|
||||
|
||||
// ParseWALFileName extracts timeline and segment number from WAL filename
|
||||
// WAL filename format: 000000010000000000000001
|
||||
// - First 8 hex digits: timeline ID
|
||||
// - Next 8 hex digits: log file ID
|
||||
// - Last 8 hex digits: segment number
|
||||
func ParseWALFileName(filename string) (timeline uint32, segment uint64, err error) {
|
||||
// Remove any extensions (.gz, .enc, etc.)
|
||||
base := filepath.Base(filename)
|
||||
base = strings.TrimSuffix(base, ".gz")
|
||||
base = strings.TrimSuffix(base, ".enc")
|
||||
|
||||
// WAL files are 24 hex characters
|
||||
if len(base) != 24 {
|
||||
return 0, 0, fmt.Errorf("invalid WAL filename length: expected 24 characters, got %d", len(base))
|
||||
}
|
||||
|
||||
// Parse timeline (first 8 chars)
|
||||
_, err = fmt.Sscanf(base[0:8], "%08X", &timeline)
|
||||
if err != nil {
|
||||
return 0, 0, fmt.Errorf("failed to parse timeline from WAL filename: %w", err)
|
||||
}
|
||||
|
||||
// Parse segment (last 16 chars as combined log file + segment)
|
||||
_, err = fmt.Sscanf(base[8:24], "%016X", &segment)
|
||||
if err != nil {
|
||||
return 0, 0, fmt.Errorf("failed to parse segment from WAL filename: %w", err)
|
||||
}
|
||||
|
||||
return timeline, segment, nil
|
||||
}
|
||||
|
||||
// ListArchivedWALFiles returns all WAL files in the archive directory
|
||||
func (a *Archiver) ListArchivedWALFiles(config ArchiveConfig) ([]WALArchiveInfo, error) {
|
||||
entries, err := os.ReadDir(config.ArchiveDir)
|
||||
if err != nil {
|
||||
if os.IsNotExist(err) {
|
||||
return []WALArchiveInfo{}, nil // Empty archive is valid
|
||||
}
|
||||
return nil, fmt.Errorf("failed to read WAL archive directory: %w", err)
|
||||
}
|
||||
|
||||
var archives []WALArchiveInfo
|
||||
for _, entry := range entries {
|
||||
if entry.IsDir() {
|
||||
continue
|
||||
}
|
||||
|
||||
filename := entry.Name()
|
||||
// Skip non-WAL files (must be 24 hex chars possibly with .gz/.enc extensions)
|
||||
baseName := strings.TrimSuffix(strings.TrimSuffix(filename, ".gz"), ".enc")
|
||||
if len(baseName) != 24 {
|
||||
continue
|
||||
}
|
||||
|
||||
timeline, segment, err := ParseWALFileName(filename)
|
||||
if err != nil {
|
||||
a.log.Warn("Skipping invalid WAL file", "file", filename, "error", err)
|
||||
continue
|
||||
}
|
||||
|
||||
info, err := entry.Info()
|
||||
if err != nil {
|
||||
a.log.Warn("Could not stat WAL file", "file", filename, "error", err)
|
||||
continue
|
||||
}
|
||||
|
||||
archives = append(archives, WALArchiveInfo{
|
||||
WALFileName: baseName,
|
||||
ArchivePath: filepath.Join(config.ArchiveDir, filename),
|
||||
ArchivedSize: info.Size(),
|
||||
Timeline: timeline,
|
||||
Segment: segment,
|
||||
ArchivedAt: info.ModTime(),
|
||||
Compressed: strings.HasSuffix(filename, ".gz"),
|
||||
Encrypted: strings.HasSuffix(filename, ".enc"),
|
||||
})
|
||||
}
|
||||
|
||||
return archives, nil
|
||||
}
|
||||
|
||||
// CleanupOldWALFiles removes WAL archives older than retention period
|
||||
func (a *Archiver) CleanupOldWALFiles(ctx context.Context, config ArchiveConfig) (int, error) {
|
||||
if config.RetentionDays <= 0 {
|
||||
return 0, nil // No cleanup if retention not set
|
||||
}
|
||||
|
||||
cutoffTime := time.Now().AddDate(0, 0, -config.RetentionDays)
|
||||
a.log.Info("Cleaning up WAL archives", "older_than", cutoffTime.Format("2006-01-02"), "retention_days", config.RetentionDays)
|
||||
|
||||
archives, err := a.ListArchivedWALFiles(config)
|
||||
if err != nil {
|
||||
return 0, fmt.Errorf("failed to list WAL archives: %w", err)
|
||||
}
|
||||
|
||||
deleted := 0
|
||||
for _, archive := range archives {
|
||||
if archive.ArchivedAt.Before(cutoffTime) {
|
||||
a.log.Debug("Removing old WAL archive", "file", archive.WALFileName, "archived_at", archive.ArchivedAt)
|
||||
if err := os.Remove(archive.ArchivePath); err != nil {
|
||||
a.log.Warn("Failed to remove old WAL archive", "file", archive.ArchivePath, "error", err)
|
||||
continue
|
||||
}
|
||||
deleted++
|
||||
}
|
||||
}
|
||||
|
||||
a.log.Info("WAL cleanup completed", "deleted", deleted, "total_archives", len(archives))
|
||||
return deleted, nil
|
||||
}
|
||||
|
||||
// GetArchiveStats returns statistics about WAL archives
|
||||
func (a *Archiver) GetArchiveStats(config ArchiveConfig) (*ArchiveStats, error) {
|
||||
archives, err := a.ListArchivedWALFiles(config)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
stats := &ArchiveStats{
|
||||
TotalFiles: len(archives),
|
||||
CompressedFiles: 0,
|
||||
EncryptedFiles: 0,
|
||||
TotalSize: 0,
|
||||
}
|
||||
|
||||
if len(archives) > 0 {
|
||||
stats.OldestArchive = archives[0].ArchivedAt
|
||||
stats.NewestArchive = archives[0].ArchivedAt
|
||||
}
|
||||
|
||||
for _, archive := range archives {
|
||||
stats.TotalSize += archive.ArchivedSize
|
||||
|
||||
if archive.Compressed {
|
||||
stats.CompressedFiles++
|
||||
}
|
||||
if archive.Encrypted {
|
||||
stats.EncryptedFiles++
|
||||
}
|
||||
|
||||
if archive.ArchivedAt.Before(stats.OldestArchive) {
|
||||
stats.OldestArchive = archive.ArchivedAt
|
||||
}
|
||||
if archive.ArchivedAt.After(stats.NewestArchive) {
|
||||
stats.NewestArchive = archive.ArchivedAt
|
||||
}
|
||||
}
|
||||
|
||||
return stats, nil
|
||||
}
|
||||
|
||||
// ArchiveStats contains statistics about WAL archives
|
||||
type ArchiveStats struct {
|
||||
TotalFiles int `json:"total_files"`
|
||||
CompressedFiles int `json:"compressed_files"`
|
||||
EncryptedFiles int `json:"encrypted_files"`
|
||||
TotalSize int64 `json:"total_size"`
|
||||
OldestArchive time.Time `json:"oldest_archive"`
|
||||
NewestArchive time.Time `json:"newest_archive"`
|
||||
}
|
||||
|
||||
// FormatSize returns human-readable size
|
||||
func (s *ArchiveStats) FormatSize() string {
|
||||
const (
|
||||
KB = 1024
|
||||
MB = 1024 * KB
|
||||
GB = 1024 * MB
|
||||
)
|
||||
|
||||
size := float64(s.TotalSize)
|
||||
switch {
|
||||
case size >= GB:
|
||||
return fmt.Sprintf("%.2f GB", size/GB)
|
||||
case size >= MB:
|
||||
return fmt.Sprintf("%.2f MB", size/MB)
|
||||
case size >= KB:
|
||||
return fmt.Sprintf("%.2f KB", size/KB)
|
||||
default:
|
||||
return fmt.Sprintf("%d B", s.TotalSize)
|
||||
}
|
||||
}
|
||||
386
internal/wal/pitr_config.go
Normal file
386
internal/wal/pitr_config.go
Normal file
@@ -0,0 +1,386 @@
|
||||
package wal
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"context"
|
||||
"fmt"
|
||||
"os"
|
||||
"os/exec"
|
||||
"path/filepath"
|
||||
"regexp"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"dbbackup/internal/config"
|
||||
"dbbackup/internal/logger"
|
||||
)
|
||||
|
||||
// PITRManager manages Point-in-Time Recovery configuration
|
||||
type PITRManager struct {
|
||||
cfg *config.Config
|
||||
log logger.Logger
|
||||
}
|
||||
|
||||
// PITRConfig holds PITR settings
|
||||
type PITRConfig struct {
|
||||
Enabled bool
|
||||
ArchiveMode string // "on", "off", "always"
|
||||
ArchiveCommand string
|
||||
ArchiveDir string
|
||||
WALLevel string // "minimal", "replica", "logical"
|
||||
MaxWALSenders int
|
||||
WALKeepSize string // e.g., "1GB"
|
||||
RestoreCommand string
|
||||
}
|
||||
|
||||
// RecoveryTarget specifies the point-in-time to recover to
|
||||
type RecoveryTarget struct {
|
||||
TargetTime *time.Time // Recover to specific timestamp
|
||||
TargetXID string // Recover to transaction ID
|
||||
TargetName string // Recover to named restore point
|
||||
TargetLSN string // Recover to Log Sequence Number
|
||||
TargetImmediate bool // Recover as soon as consistent state is reached
|
||||
TargetInclusive bool // Include target transaction
|
||||
RecoveryEndAction string // "pause", "promote", "shutdown"
|
||||
}
|
||||
|
||||
// NewPITRManager creates a new PITR manager
|
||||
func NewPITRManager(cfg *config.Config, log logger.Logger) *PITRManager {
|
||||
return &PITRManager{
|
||||
cfg: cfg,
|
||||
log: log,
|
||||
}
|
||||
}
|
||||
|
||||
// EnablePITR configures PostgreSQL for PITR by modifying postgresql.conf
|
||||
func (pm *PITRManager) EnablePITR(ctx context.Context, archiveDir string) error {
|
||||
pm.log.Info("Enabling PITR (Point-in-Time Recovery)", "archive_dir", archiveDir)
|
||||
|
||||
// Ensure archive directory exists
|
||||
if err := os.MkdirAll(archiveDir, 0700); err != nil {
|
||||
return fmt.Errorf("failed to create WAL archive directory: %w", err)
|
||||
}
|
||||
|
||||
// Find postgresql.conf location
|
||||
confPath, err := pm.findPostgreSQLConf(ctx)
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to locate postgresql.conf: %w", err)
|
||||
}
|
||||
|
||||
pm.log.Info("Found PostgreSQL configuration", "path", confPath)
|
||||
|
||||
// Backup original configuration
|
||||
backupPath := confPath + ".backup." + time.Now().Format("20060102_150405")
|
||||
if err := pm.backupFile(confPath, backupPath); err != nil {
|
||||
return fmt.Errorf("failed to backup postgresql.conf: %w", err)
|
||||
}
|
||||
pm.log.Info("Created configuration backup", "backup", backupPath)
|
||||
|
||||
// Get absolute path to dbbackup binary
|
||||
dbbackupPath, err := os.Executable()
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to get dbbackup executable path: %w", err)
|
||||
}
|
||||
|
||||
// Build archive command that calls dbbackup
|
||||
archiveCommand := fmt.Sprintf("%s wal archive %%p %%f --archive-dir %s", dbbackupPath, archiveDir)
|
||||
|
||||
// Settings to enable PITR
|
||||
settings := map[string]string{
|
||||
"wal_level": "replica", // Required for PITR
|
||||
"archive_mode": "on",
|
||||
"archive_command": archiveCommand,
|
||||
"max_wal_senders": "3",
|
||||
"wal_keep_size": "1GB", // Keep at least 1GB of WAL
|
||||
}
|
||||
|
||||
// Update postgresql.conf
|
||||
if err := pm.updatePostgreSQLConf(confPath, settings); err != nil {
|
||||
return fmt.Errorf("failed to update postgresql.conf: %w", err)
|
||||
}
|
||||
|
||||
pm.log.Info("✅ PITR configuration updated successfully")
|
||||
pm.log.Warn("⚠️ PostgreSQL restart required for changes to take effect")
|
||||
pm.log.Info("To restart PostgreSQL:")
|
||||
pm.log.Info(" sudo systemctl restart postgresql")
|
||||
pm.log.Info(" OR: sudo pg_ctlcluster <version> <cluster> restart")
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// DisablePITR disables PITR by setting archive_mode = off
|
||||
func (pm *PITRManager) DisablePITR(ctx context.Context) error {
|
||||
pm.log.Info("Disabling PITR")
|
||||
|
||||
confPath, err := pm.findPostgreSQLConf(ctx)
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to locate postgresql.conf: %w", err)
|
||||
}
|
||||
|
||||
// Backup configuration
|
||||
backupPath := confPath + ".backup." + time.Now().Format("20060102_150405")
|
||||
if err := pm.backupFile(confPath, backupPath); err != nil {
|
||||
return fmt.Errorf("failed to backup postgresql.conf: %w", err)
|
||||
}
|
||||
|
||||
settings := map[string]string{
|
||||
"archive_mode": "off",
|
||||
"archive_command": "", // Clear command
|
||||
}
|
||||
|
||||
if err := pm.updatePostgreSQLConf(confPath, settings); err != nil {
|
||||
return fmt.Errorf("failed to update postgresql.conf: %w", err)
|
||||
}
|
||||
|
||||
pm.log.Info("✅ PITR disabled successfully")
|
||||
pm.log.Warn("⚠️ PostgreSQL restart required")
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// GetCurrentPITRConfig reads current PITR settings from PostgreSQL
|
||||
func (pm *PITRManager) GetCurrentPITRConfig(ctx context.Context) (*PITRConfig, error) {
|
||||
confPath, err := pm.findPostgreSQLConf(ctx)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
file, err := os.Open(confPath)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to open postgresql.conf: %w", err)
|
||||
}
|
||||
defer file.Close()
|
||||
|
||||
config := &PITRConfig{}
|
||||
scanner := bufio.NewScanner(file)
|
||||
|
||||
for scanner.Scan() {
|
||||
line := strings.TrimSpace(scanner.Text())
|
||||
|
||||
// Skip comments and empty lines
|
||||
if line == "" || strings.HasPrefix(line, "#") {
|
||||
continue
|
||||
}
|
||||
|
||||
// Parse key = value
|
||||
parts := strings.SplitN(line, "=", 2)
|
||||
if len(parts) != 2 {
|
||||
continue
|
||||
}
|
||||
|
||||
key := strings.TrimSpace(parts[0])
|
||||
value := strings.Trim(strings.TrimSpace(parts[1]), "'\"")
|
||||
|
||||
switch key {
|
||||
case "wal_level":
|
||||
config.WALLevel = value
|
||||
case "archive_mode":
|
||||
config.ArchiveMode = value
|
||||
config.Enabled = (value == "on" || value == "always")
|
||||
case "archive_command":
|
||||
config.ArchiveCommand = value
|
||||
case "max_wal_senders":
|
||||
fmt.Sscanf(value, "%d", &config.MaxWALSenders)
|
||||
case "wal_keep_size":
|
||||
config.WALKeepSize = value
|
||||
case "restore_command":
|
||||
config.RestoreCommand = value
|
||||
}
|
||||
}
|
||||
|
||||
if err := scanner.Err(); err != nil {
|
||||
return nil, fmt.Errorf("error reading postgresql.conf: %w", err)
|
||||
}
|
||||
|
||||
return config, nil
|
||||
}
|
||||
|
||||
// CreateRecoveryConf creates recovery configuration for PITR restore
|
||||
// PostgreSQL 12+: Creates recovery.signal and modifies postgresql.conf
|
||||
// PostgreSQL <12: Creates recovery.conf
|
||||
func (pm *PITRManager) CreateRecoveryConf(ctx context.Context, dataDir string, target RecoveryTarget, walArchiveDir string) error {
|
||||
pm.log.Info("Creating recovery configuration", "data_dir", dataDir)
|
||||
|
||||
// Detect PostgreSQL version to determine recovery file format
|
||||
version, err := pm.getPostgreSQLVersion(ctx)
|
||||
if err != nil {
|
||||
pm.log.Warn("Could not detect PostgreSQL version, assuming >= 12", "error", err)
|
||||
version = 12 // Default to newer format
|
||||
}
|
||||
|
||||
if version >= 12 {
|
||||
return pm.createRecoverySignal(ctx, dataDir, target, walArchiveDir)
|
||||
} else {
|
||||
return pm.createLegacyRecoveryConf(dataDir, target, walArchiveDir)
|
||||
}
|
||||
}
|
||||
|
||||
// createRecoverySignal creates recovery.signal for PostgreSQL 12+
|
||||
func (pm *PITRManager) createRecoverySignal(ctx context.Context, dataDir string, target RecoveryTarget, walArchiveDir string) error {
|
||||
// Create recovery.signal file (empty file that triggers recovery mode)
|
||||
signalPath := filepath.Join(dataDir, "recovery.signal")
|
||||
if err := os.WriteFile(signalPath, []byte{}, 0600); err != nil {
|
||||
return fmt.Errorf("failed to create recovery.signal: %w", err)
|
||||
}
|
||||
pm.log.Info("Created recovery.signal", "path", signalPath)
|
||||
|
||||
// Recovery settings go in postgresql.auto.conf (PostgreSQL 12+)
|
||||
autoConfPath := filepath.Join(dataDir, "postgresql.auto.conf")
|
||||
|
||||
// Build recovery settings
|
||||
var settings []string
|
||||
settings = append(settings, fmt.Sprintf("restore_command = 'cp %s/%%f %%p'", walArchiveDir))
|
||||
|
||||
if target.TargetTime != nil {
|
||||
settings = append(settings, fmt.Sprintf("recovery_target_time = '%s'", target.TargetTime.Format("2006-01-02 15:04:05")))
|
||||
} else if target.TargetXID != "" {
|
||||
settings = append(settings, fmt.Sprintf("recovery_target_xid = '%s'", target.TargetXID))
|
||||
} else if target.TargetName != "" {
|
||||
settings = append(settings, fmt.Sprintf("recovery_target_name = '%s'", target.TargetName))
|
||||
} else if target.TargetLSN != "" {
|
||||
settings = append(settings, fmt.Sprintf("recovery_target_lsn = '%s'", target.TargetLSN))
|
||||
} else if target.TargetImmediate {
|
||||
settings = append(settings, "recovery_target = 'immediate'")
|
||||
}
|
||||
|
||||
if target.RecoveryEndAction != "" {
|
||||
settings = append(settings, fmt.Sprintf("recovery_target_action = '%s'", target.RecoveryEndAction))
|
||||
}
|
||||
|
||||
// Append to postgresql.auto.conf
|
||||
f, err := os.OpenFile(autoConfPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to open postgresql.auto.conf: %w", err)
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
if _, err := f.WriteString("\n# PITR Recovery Configuration (added by dbbackup)\n"); err != nil {
|
||||
return err
|
||||
}
|
||||
for _, setting := range settings {
|
||||
if _, err := f.WriteString(setting + "\n"); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
pm.log.Info("Recovery configuration added to postgresql.auto.conf", "path", autoConfPath)
|
||||
return nil
|
||||
}
|
||||
|
||||
// createLegacyRecoveryConf creates recovery.conf for PostgreSQL < 12
|
||||
func (pm *PITRManager) createLegacyRecoveryConf(dataDir string, target RecoveryTarget, walArchiveDir string) error {
|
||||
recoveryConfPath := filepath.Join(dataDir, "recovery.conf")
|
||||
|
||||
var content strings.Builder
|
||||
content.WriteString("# Recovery Configuration (created by dbbackup)\n")
|
||||
content.WriteString(fmt.Sprintf("restore_command = 'cp %s/%%f %%p'\n", walArchiveDir))
|
||||
|
||||
if target.TargetTime != nil {
|
||||
content.WriteString(fmt.Sprintf("recovery_target_time = '%s'\n", target.TargetTime.Format("2006-01-02 15:04:05")))
|
||||
}
|
||||
// Add other target types...
|
||||
|
||||
if err := os.WriteFile(recoveryConfPath, []byte(content.String()), 0600); err != nil {
|
||||
return fmt.Errorf("failed to create recovery.conf: %w", err)
|
||||
}
|
||||
|
||||
pm.log.Info("Created recovery.conf", "path", recoveryConfPath)
|
||||
return nil
|
||||
}
|
||||
|
||||
// Helper functions
|
||||
|
||||
func (pm *PITRManager) findPostgreSQLConf(ctx context.Context) (string, error) {
|
||||
// Try common locations
|
||||
commonPaths := []string{
|
||||
"/var/lib/postgresql/data/postgresql.conf",
|
||||
"/etc/postgresql/*/main/postgresql.conf",
|
||||
"/usr/local/pgsql/data/postgresql.conf",
|
||||
}
|
||||
|
||||
for _, pattern := range commonPaths {
|
||||
matches, _ := filepath.Glob(pattern)
|
||||
for _, path := range matches {
|
||||
if _, err := os.Stat(path); err == nil {
|
||||
return path, nil
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Try to get from PostgreSQL directly
|
||||
cmd := exec.CommandContext(ctx, "psql", "-U", pm.cfg.User, "-t", "-c", "SHOW config_file")
|
||||
output, err := cmd.Output()
|
||||
if err == nil {
|
||||
path := strings.TrimSpace(string(output))
|
||||
if _, err := os.Stat(path); err == nil {
|
||||
return path, nil
|
||||
}
|
||||
}
|
||||
|
||||
return "", fmt.Errorf("could not locate postgresql.conf. Please specify --pg-conf-path")
|
||||
}
|
||||
|
||||
func (pm *PITRManager) backupFile(src, dst string) error {
|
||||
input, err := os.ReadFile(src)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return os.WriteFile(dst, input, 0644)
|
||||
}
|
||||
|
||||
func (pm *PITRManager) updatePostgreSQLConf(confPath string, settings map[string]string) error {
|
||||
file, err := os.Open(confPath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer file.Close()
|
||||
|
||||
var lines []string
|
||||
existingKeys := make(map[string]bool)
|
||||
scanner := bufio.NewScanner(file)
|
||||
|
||||
// Read existing configuration and track which keys are already present
|
||||
for scanner.Scan() {
|
||||
line := scanner.Text()
|
||||
lines = append(lines, line)
|
||||
|
||||
// Check if this line sets one of our keys
|
||||
for key := range settings {
|
||||
if matched, _ := regexp.MatchString(fmt.Sprintf(`^\s*%s\s*=`, key), line); matched {
|
||||
existingKeys[key] = true
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if err := scanner.Err(); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Append missing settings
|
||||
for key, value := range settings {
|
||||
if !existingKeys[key] {
|
||||
if value == "" {
|
||||
lines = append(lines, fmt.Sprintf("# %s = '' # Disabled by dbbackup", key))
|
||||
} else {
|
||||
lines = append(lines, fmt.Sprintf("%s = '%s' # Added by dbbackup", key, value))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Write updated configuration
|
||||
output := strings.Join(lines, "\n") + "\n"
|
||||
return os.WriteFile(confPath, []byte(output), 0644)
|
||||
}
|
||||
|
||||
func (pm *PITRManager) getPostgreSQLVersion(ctx context.Context) (int, error) {
|
||||
cmd := exec.CommandContext(ctx, "psql", "-U", pm.cfg.User, "-t", "-c", "SHOW server_version")
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
versionStr := strings.TrimSpace(string(output))
|
||||
var major int
|
||||
fmt.Sscanf(versionStr, "%d", &major)
|
||||
return major, nil
|
||||
}
|
||||
Reference in New Issue
Block a user