Initial commit: Database Backup Tool v1.1.0

- PostgreSQL and MySQL support - Interactive TUI with fixed menu navigation - Line-by-line progress display - CPU-aware parallel processing - Cross-platform build support - Configuration settings menu - Silent mode for TUI operations
2025-10-22 19:27:38 +00:00
commit 9b3c3f2b1b
39 changed files with 6498 additions and 0 deletions
--- a/internal/database/postgresql.go
+++ b/internal/database/postgresql.go
@ -0,0 +1,427 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+
+	"dbbackup/internal/config"
+	"dbbackup/internal/logger"
+)
+
+// PostgreSQL implements Database interface for PostgreSQL
+type PostgreSQL struct {
+	baseDatabase
+}
+
+// NewPostgreSQL creates a new PostgreSQL database instance
+func NewPostgreSQL(cfg *config.Config, log logger.Logger) *PostgreSQL {
+	return &PostgreSQL{
+		baseDatabase: baseDatabase{
+			cfg: cfg,
+			log: log,
+		},
+	}
+}
+
+// Connect establishes a connection to PostgreSQL
+func (p *PostgreSQL) Connect(ctx context.Context) error {
+	// Build PostgreSQL DSN
+	dsn := p.buildDSN()
+	p.dsn = dsn
+	
+	p.log.Debug("Connecting to PostgreSQL", "dsn", sanitizeDSN(dsn))
+	
+	db, err := sql.Open("postgres", dsn)
+	if err != nil {
+		return fmt.Errorf("failed to open PostgreSQL connection: %w", err)
+	}
+	
+	// Configure connection pool
+	db.SetMaxOpenConns(10)
+	db.SetMaxIdleConns(5)
+	db.SetConnMaxLifetime(0)
+	
+	// Test connection
+	timeoutCtx, cancel := buildTimeout(ctx, 0)
+	defer cancel()
+	
+	if err := db.PingContext(timeoutCtx); err != nil {
+		db.Close()
+		return fmt.Errorf("failed to ping PostgreSQL: %w", err)
+	}
+	
+	p.db = db
+	p.log.Info("Connected to PostgreSQL successfully")
+	return nil
+}
+
+// ListDatabases returns list of non-template databases
+func (p *PostgreSQL) ListDatabases(ctx context.Context) ([]string, error) {
+	if p.db == nil {
+		return nil, fmt.Errorf("not connected to database")
+	}
+	
+	query := `SELECT datname FROM pg_database 
+	          WHERE datistemplate = false 
+	          ORDER BY datname`
+	
+	rows, err := p.db.QueryContext(ctx, query)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query databases: %w", err)
+	}
+	defer rows.Close()
+	
+	var databases []string
+	for rows.Next() {
+		var name string
+		if err := rows.Scan(&name); err != nil {
+			return nil, fmt.Errorf("failed to scan database name: %w", err)
+		}
+		databases = append(databases, name)
+	}
+	
+	return databases, rows.Err()
+}
+
+// ListTables returns list of tables in a database
+func (p *PostgreSQL) ListTables(ctx context.Context, database string) ([]string, error) {
+	if p.db == nil {
+		return nil, fmt.Errorf("not connected to database")
+	}
+	
+	query := `SELECT schemaname||'.'||tablename as full_name
+	          FROM pg_tables 
+	          WHERE schemaname NOT IN ('information_schema', 'pg_catalog', 'pg_toast')
+	          ORDER BY schemaname, tablename`
+	
+	rows, err := p.db.QueryContext(ctx, query)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query tables: %w", err)
+	}
+	defer rows.Close()
+	
+	var tables []string
+	for rows.Next() {
+		var name string
+		if err := rows.Scan(&name); err != nil {
+			return nil, fmt.Errorf("failed to scan table name: %w", err)
+		}
+		tables = append(tables, name)
+	}
+	
+	return tables, rows.Err()
+}
+
+// CreateDatabase creates a new database
+func (p *PostgreSQL) CreateDatabase(ctx context.Context, name string) error {
+	if p.db == nil {
+		return fmt.Errorf("not connected to database")
+	}
+	
+	// PostgreSQL doesn't support CREATE DATABASE in transactions or prepared statements
+	query := fmt.Sprintf("CREATE DATABASE %s", name)
+	_, err := p.db.ExecContext(ctx, query)
+	if err != nil {
+		return fmt.Errorf("failed to create database %s: %w", name, err)
+	}
+	
+	p.log.Info("Created database", "name", name)
+	return nil
+}
+
+// DropDatabase drops a database
+func (p *PostgreSQL) DropDatabase(ctx context.Context, name string) error {
+	if p.db == nil {
+		return fmt.Errorf("not connected to database")
+	}
+	
+	// Force drop connections and drop database
+	query := fmt.Sprintf("DROP DATABASE IF EXISTS %s", name)
+	_, err := p.db.ExecContext(ctx, query)
+	if err != nil {
+		return fmt.Errorf("failed to drop database %s: %w", name, err)
+	}
+	
+	p.log.Info("Dropped database", "name", name)
+	return nil
+}
+
+// DatabaseExists checks if a database exists
+func (p *PostgreSQL) DatabaseExists(ctx context.Context, name string) (bool, error) {
+	if p.db == nil {
+		return false, fmt.Errorf("not connected to database")
+	}
+	
+	query := `SELECT EXISTS(SELECT 1 FROM pg_database WHERE datname = $1)`
+	var exists bool
+	err := p.db.QueryRowContext(ctx, query, name).Scan(&exists)
+	if err != nil {
+		return false, fmt.Errorf("failed to check database existence: %w", err)
+	}
+	
+	return exists, nil
+}
+
+// GetVersion returns PostgreSQL version
+func (p *PostgreSQL) GetVersion(ctx context.Context) (string, error) {
+	if p.db == nil {
+		return "", fmt.Errorf("not connected to database")
+	}
+	
+	var version string
+	err := p.db.QueryRowContext(ctx, "SELECT version()").Scan(&version)
+	if err != nil {
+		return "", fmt.Errorf("failed to get version: %w", err)
+	}
+	
+	return version, nil
+}
+
+// GetDatabaseSize returns database size in bytes
+func (p *PostgreSQL) GetDatabaseSize(ctx context.Context, database string) (int64, error) {
+	if p.db == nil {
+		return 0, fmt.Errorf("not connected to database")
+	}
+	
+	query := `SELECT pg_database_size($1)`
+	var size int64
+	err := p.db.QueryRowContext(ctx, query, database).Scan(&size)
+	if err != nil {
+		return 0, fmt.Errorf("failed to get database size: %w", err)
+	}
+	
+	return size, nil
+}
+
+// GetTableRowCount returns approximate row count for a table
+func (p *PostgreSQL) GetTableRowCount(ctx context.Context, database, table string) (int64, error) {
+	if p.db == nil {
+		return 0, fmt.Errorf("not connected to database")
+	}
+	
+	// Use pg_stat_user_tables for approximate count (faster)
+	parts := strings.Split(table, ".")
+	if len(parts) != 2 {
+		return 0, fmt.Errorf("table name must be in format schema.table")
+	}
+	
+	query := `SELECT COALESCE(n_tup_ins, 0) FROM pg_stat_user_tables 
+	          WHERE schemaname = $1 AND relname = $2`
+	
+	var count int64
+	err := p.db.QueryRowContext(ctx, query, parts[0], parts[1]).Scan(&count)
+	if err != nil {
+		// Fallback to exact count if stats not available
+		exactQuery := fmt.Sprintf("SELECT COUNT(*) FROM %s", table)
+		err = p.db.QueryRowContext(ctx, exactQuery).Scan(&count)
+		if err != nil {
+			return 0, fmt.Errorf("failed to get table row count: %w", err)
+		}
+	}
+	
+	return count, nil
+}
+
+// BuildBackupCommand builds pg_dump command
+func (p *PostgreSQL) BuildBackupCommand(database, outputFile string, options BackupOptions) []string {
+	cmd := []string{"pg_dump"}
+	
+	// Connection parameters
+	if p.cfg.Host != "localhost" {
+		cmd = append(cmd, "-h", p.cfg.Host)
+		cmd = append(cmd, "-p", strconv.Itoa(p.cfg.Port))
+		cmd = append(cmd, "--no-password")
+	}
+	cmd = append(cmd, "-U", p.cfg.User)
+	
+	// Format and compression
+	if options.Format != "" {
+		cmd = append(cmd, "--format="+options.Format)
+	} else {
+		cmd = append(cmd, "--format=custom")
+	}
+	
+	if options.Compression > 0 {
+		cmd = append(cmd, "--compress="+strconv.Itoa(options.Compression))
+	}
+	
+	// Parallel jobs (only for directory format)
+	if options.Parallel > 1 && options.Format == "directory" {
+		cmd = append(cmd, "--jobs="+strconv.Itoa(options.Parallel))
+	}
+	
+	// Options
+	if options.Blobs {
+		cmd = append(cmd, "--blobs")
+	}
+	if options.SchemaOnly {
+		cmd = append(cmd, "--schema-only")
+	}
+	if options.DataOnly {
+		cmd = append(cmd, "--data-only")
+	}
+	if options.NoOwner {
+		cmd = append(cmd, "--no-owner")
+	}
+	if options.NoPrivileges {
+		cmd = append(cmd, "--no-privileges")
+	}
+	if options.Role != "" {
+		cmd = append(cmd, "--role="+options.Role)
+	}
+	
+	// Database and output
+	cmd = append(cmd, "--dbname="+database)
+	cmd = append(cmd, "--file="+outputFile)
+	
+	return cmd
+}
+
+// BuildRestoreCommand builds pg_restore command
+func (p *PostgreSQL) BuildRestoreCommand(database, inputFile string, options RestoreOptions) []string {
+	cmd := []string{"pg_restore"}
+	
+	// Connection parameters
+	if p.cfg.Host != "localhost" {
+		cmd = append(cmd, "-h", p.cfg.Host)
+		cmd = append(cmd, "-p", strconv.Itoa(p.cfg.Port))
+		cmd = append(cmd, "--no-password")
+	}
+	cmd = append(cmd, "-U", p.cfg.User)
+	
+	// Parallel jobs
+	if options.Parallel > 1 {
+		cmd = append(cmd, "--jobs="+strconv.Itoa(options.Parallel))
+	}
+	
+	// Options
+	if options.Clean {
+		cmd = append(cmd, "--clean")
+	}
+	if options.IfExists {
+		cmd = append(cmd, "--if-exists")
+	}
+	if options.NoOwner {
+		cmd = append(cmd, "--no-owner")
+	}
+	if options.NoPrivileges {
+		cmd = append(cmd, "--no-privileges")
+	}
+	if options.SingleTransaction {
+		cmd = append(cmd, "--single-transaction")
+	}
+	
+	// Database and input
+	cmd = append(cmd, "--dbname="+database)
+	cmd = append(cmd, inputFile)
+	
+	return cmd
+}
+
+// BuildSampleQuery builds SQL query for sampling data
+func (p *PostgreSQL) BuildSampleQuery(database, table string, strategy SampleStrategy) string {
+	switch strategy.Type {
+	case "ratio":
+		// Every Nth record using row_number
+		return fmt.Sprintf("SELECT * FROM (SELECT *, row_number() OVER () as rn FROM %s) t WHERE rn %% %d = 1", 
+			table, strategy.Value)
+	case "percent":
+		// Percentage sampling using TABLESAMPLE (PostgreSQL 9.5+)
+		return fmt.Sprintf("SELECT * FROM %s TABLESAMPLE BERNOULLI(%d)", table, strategy.Value)
+	case "count":
+		// First N records
+		return fmt.Sprintf("SELECT * FROM %s LIMIT %d", table, strategy.Value)
+	default:
+		return fmt.Sprintf("SELECT * FROM %s LIMIT 1000", table)
+	}
+}
+
+// ValidateBackupTools checks if required PostgreSQL tools are available
+func (p *PostgreSQL) ValidateBackupTools() error {
+	tools := []string{"pg_dump", "pg_restore", "pg_dumpall", "psql"}
+	
+	for _, tool := range tools {
+		if _, err := exec.LookPath(tool); err != nil {
+			return fmt.Errorf("required tool not found: %s", tool)
+		}
+	}
+	
+	return nil
+}
+
+// buildDSN constructs PostgreSQL connection string
+func (p *PostgreSQL) buildDSN() string {
+	dsn := fmt.Sprintf("user=%s dbname=%s", p.cfg.User, p.cfg.Database)
+	
+	if p.cfg.Password != "" {
+		dsn += " password=" + p.cfg.Password
+	}
+	
+	// For localhost connections, try socket first for peer auth
+	if p.cfg.Host == "localhost" && p.cfg.Password == "" {
+		// Try Unix socket connection for peer authentication
+		// Common PostgreSQL socket locations
+		socketDirs := []string{
+			"/var/run/postgresql",
+			"/tmp",
+			"/var/lib/pgsql",
+		}
+		
+		for _, dir := range socketDirs {
+			socketPath := fmt.Sprintf("%s/.s.PGSQL.%d", dir, p.cfg.Port)
+			if _, err := os.Stat(socketPath); err == nil {
+				dsn += " host=" + dir
+				p.log.Debug("Using PostgreSQL socket", "path", socketPath)
+				break
+			}
+		}
+	} else if p.cfg.Host != "localhost" || p.cfg.Password != "" {
+		// Use TCP connection
+		dsn += " host=" + p.cfg.Host
+		dsn += " port=" + strconv.Itoa(p.cfg.Port)
+	}
+	
+	if p.cfg.SSLMode != "" && !p.cfg.Insecure {
+		// Map SSL modes to supported values for lib/pq
+		switch strings.ToLower(p.cfg.SSLMode) {
+		case "prefer", "preferred":
+			dsn += " sslmode=require" // lib/pq default, closest to prefer
+		case "require", "required":
+			dsn += " sslmode=require"
+		case "verify-ca":
+			dsn += " sslmode=verify-ca"
+		case "verify-full", "verify-identity":
+			dsn += " sslmode=verify-full"
+		case "disable", "disabled":
+			dsn += " sslmode=disable"
+		default:
+			dsn += " sslmode=require" // Safe default
+		}
+	} else if p.cfg.Insecure {
+		dsn += " sslmode=disable"
+	}
+	
+	return dsn
+}
+
+// sanitizeDSN removes password from DSN for logging
+func sanitizeDSN(dsn string) string {
+	// Simple password removal for logging
+	parts := strings.Split(dsn, " ")
+	var sanitized []string
+	
+	for _, part := range parts {
+		if strings.HasPrefix(part, "password=") {
+			sanitized = append(sanitized, "password=***")
+		} else {
+			sanitized = append(sanitized, part)
+		}
+	}
+	
+	return strings.Join(sanitized, " ")
+}