A. Renz
914307ac8f
- Add .golangci.yml with minimal linters (govet, ineffassign) - Run gofmt -s and goimports on all files to fix formatting - Disable fieldalignment and copylocks checks in govet
135 lines
3.3 KiB
Go
Executable File
135 lines
3.3 KiB
Go
Executable File
package database
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import (
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"context"
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"database/sql"
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"fmt"
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"time"
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"dbbackup/internal/config"
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"dbbackup/internal/logger"
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_ "github.com/go-sql-driver/mysql" // MySQL driver
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_ "github.com/jackc/pgx/v5/stdlib" // PostgreSQL driver (pgx - high performance)
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)
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// Database represents a database connection and operations
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type Database interface {
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// Connection management
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Connect(ctx context.Context) error
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Close() error
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Ping(ctx context.Context) error
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// Database discovery
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ListDatabases(ctx context.Context) ([]string, error)
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ListTables(ctx context.Context, database string) ([]string, error)
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// Database operations
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CreateDatabase(ctx context.Context, name string) error
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DropDatabase(ctx context.Context, name string) error
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DatabaseExists(ctx context.Context, name string) (bool, error)
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// Information
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GetVersion(ctx context.Context) (string, error)
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GetDatabaseSize(ctx context.Context, database string) (int64, error)
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GetTableRowCount(ctx context.Context, database, table string) (int64, error)
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// Backup/Restore command building
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BuildBackupCommand(database, outputFile string, options BackupOptions) []string
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BuildRestoreCommand(database, inputFile string, options RestoreOptions) []string
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BuildSampleQuery(database, table string, strategy SampleStrategy) string
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// Validation
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ValidateBackupTools() error
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}
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// BackupOptions holds options for backup operations
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type BackupOptions struct {
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Compression int
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Parallel int
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Format string // "custom", "plain", "directory"
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Blobs bool
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SchemaOnly bool
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DataOnly bool
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NoOwner bool
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NoPrivileges bool
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Clean bool
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IfExists bool
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Role string
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}
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// RestoreOptions holds options for restore operations
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type RestoreOptions struct {
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Parallel int
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Clean bool
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IfExists bool
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NoOwner bool
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NoPrivileges bool
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SingleTransaction bool
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Verbose bool // Enable verbose output (caution: can cause OOM on large restores)
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}
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// SampleStrategy defines how to sample data
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type SampleStrategy struct {
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Type string // "ratio", "percent", "count"
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Value int
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}
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// DatabaseInfo holds database metadata
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type DatabaseInfo struct {
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Name string
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Size int64
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Owner string
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Encoding string
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Collation string
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Tables []TableInfo
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}
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// TableInfo holds table metadata
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type TableInfo struct {
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Schema string
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Name string
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RowCount int64
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Size int64
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}
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// New creates a new database instance based on configuration
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func New(cfg *config.Config, log logger.Logger) (Database, error) {
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if cfg.IsPostgreSQL() {
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return NewPostgreSQL(cfg, log), nil
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} else if cfg.IsMySQL() {
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return NewMySQL(cfg, log), nil
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}
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return nil, fmt.Errorf("unsupported database type: %s", cfg.DatabaseType)
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}
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// Common database implementation
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type baseDatabase struct {
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cfg *config.Config
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log logger.Logger
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db *sql.DB
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dsn string
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}
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func (b *baseDatabase) Close() error {
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if b.db != nil {
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return b.db.Close()
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}
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return nil
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}
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func (b *baseDatabase) Ping(ctx context.Context) error {
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if b.db == nil {
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return fmt.Errorf("database not connected")
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}
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return b.db.PingContext(ctx)
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}
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// buildTimeout creates a context with timeout for database operations
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func buildTimeout(ctx context.Context, timeout time.Duration) (context.Context, context.CancelFunc) {
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if timeout <= 0 {
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timeout = 30 * time.Second
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}
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return context.WithTimeout(ctx, timeout)
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}
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