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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Block a user