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:
@@ -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
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PITREnabled bool // Enable WAL archiving for PITR
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WALArchiveDir string // Directory to store WAL archives
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WALCompression bool // Compress WAL files
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WALEncryption bool // Encrypt WAL files
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// TUI automation options (for testing)
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TUIAutoSelect int // Auto-select menu option (-1 = disabled)
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TUIAutoDatabase string // Pre-fill database name
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324
internal/wal/archiver.go
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324
internal/wal/archiver.go
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@@ -0,0 +1,324 @@
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package wal
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import (
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"context"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"time"
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"dbbackup/internal/config"
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"dbbackup/internal/logger"
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)
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// Archiver handles PostgreSQL Write-Ahead Log (WAL) archiving for PITR
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type Archiver struct {
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cfg *config.Config
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log logger.Logger
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}
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// ArchiveConfig holds WAL archiving configuration
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type ArchiveConfig struct {
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ArchiveDir string // Directory to store archived WAL files
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CompressWAL bool // Compress WAL files with gzip
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EncryptWAL bool // Encrypt WAL files
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RetentionDays int // Days to keep WAL archives
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VerifyChecksum bool // Verify WAL file checksums
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}
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// WALArchiveInfo contains metadata about an archived WAL file
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type WALArchiveInfo struct {
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WALFileName string `json:"wal_filename"`
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ArchivePath string `json:"archive_path"`
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OriginalSize int64 `json:"original_size"`
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ArchivedSize int64 `json:"archived_size"`
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Checksum string `json:"checksum"`
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Timeline uint32 `json:"timeline"`
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Segment uint64 `json:"segment"`
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ArchivedAt time.Time `json:"archived_at"`
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Compressed bool `json:"compressed"`
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Encrypted bool `json:"encrypted"`
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}
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// NewArchiver creates a new WAL archiver
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func NewArchiver(cfg *config.Config, log logger.Logger) *Archiver {
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return &Archiver{
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cfg: cfg,
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log: log,
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}
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}
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// ArchiveWALFile archives a single WAL file to the archive directory
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// This is called by PostgreSQL's archive_command
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func (a *Archiver) ArchiveWALFile(ctx context.Context, walFilePath, walFileName string, config ArchiveConfig) (*WALArchiveInfo, error) {
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a.log.Info("Archiving WAL file", "wal", walFileName, "source", walFilePath)
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// Validate WAL file exists
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stat, err := os.Stat(walFilePath)
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if err != nil {
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return nil, fmt.Errorf("WAL file not found: %s: %w", walFilePath, err)
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}
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// Ensure archive directory exists
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if err := os.MkdirAll(config.ArchiveDir, 0700); err != nil {
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return nil, fmt.Errorf("failed to create WAL archive directory %s: %w", config.ArchiveDir, err)
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}
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// Parse WAL filename to extract timeline and segment
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timeline, segment, err := ParseWALFileName(walFileName)
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if err != nil {
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a.log.Warn("Could not parse WAL filename (continuing anyway)", "file", walFileName, "error", err)
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timeline, segment = 0, 0 // Use defaults for non-standard names
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}
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// Determine target archive path
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archivePath := filepath.Join(config.ArchiveDir, walFileName)
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if config.CompressWAL {
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archivePath += ".gz"
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}
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if config.EncryptWAL {
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archivePath += ".enc"
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}
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// Copy WAL file to archive
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srcFile, err := os.Open(walFilePath)
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if err != nil {
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return nil, fmt.Errorf("failed to open WAL file %s: %w", walFilePath, err)
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}
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defer srcFile.Close()
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dstFile, err := os.OpenFile(archivePath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
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if err != nil {
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return nil, fmt.Errorf("failed to create archive file %s: %w", archivePath, err)
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}
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defer dstFile.Close()
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// TODO: Add compression support (gzip)
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// TODO: Add encryption support (AES-256-GCM)
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// For now, simple copy
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written, err := io.Copy(dstFile, srcFile)
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if err != nil {
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return nil, fmt.Errorf("failed to copy WAL file to archive: %w", err)
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}
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if written != stat.Size() {
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return nil, fmt.Errorf("incomplete WAL copy: wrote %d bytes, expected %d", written, stat.Size())
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}
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// Sync to disk to ensure durability
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if err := dstFile.Sync(); err != nil {
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return nil, fmt.Errorf("failed to sync WAL archive to disk: %w", err)
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}
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// Verify archive was created successfully
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archiveStat, err := os.Stat(archivePath)
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if err != nil {
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return nil, fmt.Errorf("failed to verify archived WAL file: %w", err)
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}
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info := &WALArchiveInfo{
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WALFileName: walFileName,
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ArchivePath: archivePath,
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OriginalSize: stat.Size(),
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ArchivedSize: archiveStat.Size(),
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Timeline: timeline,
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Segment: segment,
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ArchivedAt: time.Now(),
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Compressed: config.CompressWAL,
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Encrypted: config.EncryptWAL,
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}
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a.log.Info("WAL file archived successfully",
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"wal", walFileName,
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"archive", archivePath,
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"size", stat.Size(),
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"timeline", timeline,
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"segment", segment)
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return info, nil
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}
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// ParseWALFileName extracts timeline and segment number from WAL filename
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// WAL filename format: 000000010000000000000001
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// - First 8 hex digits: timeline ID
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// - Next 8 hex digits: log file ID
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// - Last 8 hex digits: segment number
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func ParseWALFileName(filename string) (timeline uint32, segment uint64, err error) {
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// Remove any extensions (.gz, .enc, etc.)
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base := filepath.Base(filename)
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base = strings.TrimSuffix(base, ".gz")
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base = strings.TrimSuffix(base, ".enc")
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// WAL files are 24 hex characters
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if len(base) != 24 {
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return 0, 0, fmt.Errorf("invalid WAL filename length: expected 24 characters, got %d", len(base))
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}
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// Parse timeline (first 8 chars)
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_, err = fmt.Sscanf(base[0:8], "%08X", &timeline)
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if err != nil {
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return 0, 0, fmt.Errorf("failed to parse timeline from WAL filename: %w", err)
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}
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// Parse segment (last 16 chars as combined log file + segment)
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_, err = fmt.Sscanf(base[8:24], "%016X", &segment)
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if err != nil {
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return 0, 0, fmt.Errorf("failed to parse segment from WAL filename: %w", err)
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}
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return timeline, segment, nil
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}
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// ListArchivedWALFiles returns all WAL files in the archive directory
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func (a *Archiver) ListArchivedWALFiles(config ArchiveConfig) ([]WALArchiveInfo, error) {
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entries, err := os.ReadDir(config.ArchiveDir)
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if err != nil {
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if os.IsNotExist(err) {
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return []WALArchiveInfo{}, nil // Empty archive is valid
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}
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return nil, fmt.Errorf("failed to read WAL archive directory: %w", err)
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}
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var archives []WALArchiveInfo
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for _, entry := range entries {
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if entry.IsDir() {
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continue
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}
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filename := entry.Name()
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// Skip non-WAL files (must be 24 hex chars possibly with .gz/.enc extensions)
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baseName := strings.TrimSuffix(strings.TrimSuffix(filename, ".gz"), ".enc")
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if len(baseName) != 24 {
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continue
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}
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timeline, segment, err := ParseWALFileName(filename)
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if err != nil {
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a.log.Warn("Skipping invalid WAL file", "file", filename, "error", err)
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continue
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}
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info, err := entry.Info()
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if err != nil {
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a.log.Warn("Could not stat WAL file", "file", filename, "error", err)
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continue
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}
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archives = append(archives, WALArchiveInfo{
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WALFileName: baseName,
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ArchivePath: filepath.Join(config.ArchiveDir, filename),
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ArchivedSize: info.Size(),
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Timeline: timeline,
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Segment: segment,
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ArchivedAt: info.ModTime(),
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Compressed: strings.HasSuffix(filename, ".gz"),
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Encrypted: strings.HasSuffix(filename, ".enc"),
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})
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}
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return archives, nil
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}
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// CleanupOldWALFiles removes WAL archives older than retention period
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func (a *Archiver) CleanupOldWALFiles(ctx context.Context, config ArchiveConfig) (int, error) {
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if config.RetentionDays <= 0 {
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return 0, nil // No cleanup if retention not set
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}
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cutoffTime := time.Now().AddDate(0, 0, -config.RetentionDays)
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a.log.Info("Cleaning up WAL archives", "older_than", cutoffTime.Format("2006-01-02"), "retention_days", config.RetentionDays)
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archives, err := a.ListArchivedWALFiles(config)
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if err != nil {
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return 0, fmt.Errorf("failed to list WAL archives: %w", err)
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}
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deleted := 0
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for _, archive := range archives {
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if archive.ArchivedAt.Before(cutoffTime) {
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a.log.Debug("Removing old WAL archive", "file", archive.WALFileName, "archived_at", archive.ArchivedAt)
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if err := os.Remove(archive.ArchivePath); err != nil {
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a.log.Warn("Failed to remove old WAL archive", "file", archive.ArchivePath, "error", err)
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continue
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}
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deleted++
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}
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}
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a.log.Info("WAL cleanup completed", "deleted", deleted, "total_archives", len(archives))
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return deleted, nil
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}
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// GetArchiveStats returns statistics about WAL archives
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func (a *Archiver) GetArchiveStats(config ArchiveConfig) (*ArchiveStats, error) {
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archives, err := a.ListArchivedWALFiles(config)
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if err != nil {
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return nil, err
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}
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stats := &ArchiveStats{
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TotalFiles: len(archives),
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CompressedFiles: 0,
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EncryptedFiles: 0,
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TotalSize: 0,
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}
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if len(archives) > 0 {
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stats.OldestArchive = archives[0].ArchivedAt
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stats.NewestArchive = archives[0].ArchivedAt
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}
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for _, archive := range archives {
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stats.TotalSize += archive.ArchivedSize
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if archive.Compressed {
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stats.CompressedFiles++
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}
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if archive.Encrypted {
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stats.EncryptedFiles++
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}
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if archive.ArchivedAt.Before(stats.OldestArchive) {
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stats.OldestArchive = archive.ArchivedAt
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}
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if archive.ArchivedAt.After(stats.NewestArchive) {
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stats.NewestArchive = archive.ArchivedAt
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}
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}
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return stats, nil
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}
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// ArchiveStats contains statistics about WAL archives
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type ArchiveStats struct {
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TotalFiles int `json:"total_files"`
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CompressedFiles int `json:"compressed_files"`
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EncryptedFiles int `json:"encrypted_files"`
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TotalSize int64 `json:"total_size"`
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OldestArchive time.Time `json:"oldest_archive"`
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NewestArchive time.Time `json:"newest_archive"`
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}
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// FormatSize returns human-readable size
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func (s *ArchiveStats) FormatSize() string {
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const (
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KB = 1024
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MB = 1024 * KB
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GB = 1024 * MB
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)
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size := float64(s.TotalSize)
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switch {
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case size >= GB:
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return fmt.Sprintf("%.2f GB", size/GB)
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case size >= MB:
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return fmt.Sprintf("%.2f MB", size/MB)
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case size >= KB:
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return fmt.Sprintf("%.2f KB", size/KB)
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default:
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return fmt.Sprintf("%d B", s.TotalSize)
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}
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}
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386
internal/wal/pitr_config.go
Normal file
386
internal/wal/pitr_config.go
Normal file
@@ -0,0 +1,386 @@
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package wal
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import (
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"bufio"
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"context"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strings"
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"time"
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"dbbackup/internal/config"
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"dbbackup/internal/logger"
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)
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// PITRManager manages Point-in-Time Recovery configuration
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type PITRManager struct {
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cfg *config.Config
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log logger.Logger
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}
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// PITRConfig holds PITR settings
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type PITRConfig struct {
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Enabled bool
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ArchiveMode string // "on", "off", "always"
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ArchiveCommand string
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ArchiveDir string
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WALLevel string // "minimal", "replica", "logical"
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MaxWALSenders int
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WALKeepSize string // e.g., "1GB"
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RestoreCommand string
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}
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// RecoveryTarget specifies the point-in-time to recover to
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type RecoveryTarget struct {
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TargetTime *time.Time // Recover to specific timestamp
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TargetXID string // Recover to transaction ID
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TargetName string // Recover to named restore point
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TargetLSN string // Recover to Log Sequence Number
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TargetImmediate bool // Recover as soon as consistent state is reached
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TargetInclusive bool // Include target transaction
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RecoveryEndAction string // "pause", "promote", "shutdown"
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}
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// NewPITRManager creates a new PITR manager
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func NewPITRManager(cfg *config.Config, log logger.Logger) *PITRManager {
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return &PITRManager{
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cfg: cfg,
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log: log,
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}
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}
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// EnablePITR configures PostgreSQL for PITR by modifying postgresql.conf
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func (pm *PITRManager) EnablePITR(ctx context.Context, archiveDir string) error {
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pm.log.Info("Enabling PITR (Point-in-Time Recovery)", "archive_dir", archiveDir)
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// Ensure archive directory exists
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if err := os.MkdirAll(archiveDir, 0700); err != nil {
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return fmt.Errorf("failed to create WAL archive directory: %w", err)
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}
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// Find postgresql.conf location
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confPath, err := pm.findPostgreSQLConf(ctx)
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if err != nil {
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return fmt.Errorf("failed to locate postgresql.conf: %w", err)
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}
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pm.log.Info("Found PostgreSQL configuration", "path", confPath)
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// Backup original configuration
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backupPath := confPath + ".backup." + time.Now().Format("20060102_150405")
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if err := pm.backupFile(confPath, backupPath); err != nil {
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return fmt.Errorf("failed to backup postgresql.conf: %w", err)
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}
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pm.log.Info("Created configuration backup", "backup", backupPath)
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// Get absolute path to dbbackup binary
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dbbackupPath, err := os.Executable()
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if err != nil {
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return fmt.Errorf("failed to get dbbackup executable path: %w", err)
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}
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// Build archive command that calls dbbackup
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archiveCommand := fmt.Sprintf("%s wal archive %%p %%f --archive-dir %s", dbbackupPath, archiveDir)
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// Settings to enable PITR
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settings := map[string]string{
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"wal_level": "replica", // Required for PITR
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"archive_mode": "on",
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"archive_command": archiveCommand,
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"max_wal_senders": "3",
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"wal_keep_size": "1GB", // Keep at least 1GB of WAL
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}
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// Update postgresql.conf
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if err := pm.updatePostgreSQLConf(confPath, settings); err != nil {
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return fmt.Errorf("failed to update postgresql.conf: %w", err)
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}
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pm.log.Info("✅ PITR configuration updated successfully")
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pm.log.Warn("⚠️ PostgreSQL restart required for changes to take effect")
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pm.log.Info("To restart PostgreSQL:")
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pm.log.Info(" sudo systemctl restart postgresql")
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pm.log.Info(" OR: sudo pg_ctlcluster <version> <cluster> restart")
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return nil
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}
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// DisablePITR disables PITR by setting archive_mode = off
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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