Rene Nochebuena
d64fd5403d
Introduces code.nochebuena.dev/einherjar/db-mysql — the MySQL database starter for the Einherjar framework. Absorbs the mysql package from micro-lib using the go-sql-driver/mysql driver, replacing fmt.Errorf wrapping with core/xerrors. Interfaces (CT-6: one TypeSpec per file): - Executor — ExecContext, QueryContext, QueryRowContext (database/sql types) - Tx — Executor + Commit(), Rollback() — no ctx; honest database/sql contract - Provider — GetExecutor, Begin, BeginTx, Ping, HandleError - Component — lifecycle.Component + observability.Checkable + Provider + Stats() - UnitOfWork — Do(ctx, fn) Implementation: - New(logger, cfg) Component — pool not created until OnInit - OnInit: sql.Open + SetMaxOpenConns/SetMaxIdleConns/SetConnMaxLifetime/SetConnMaxIdleTime - OnStart: Ping with 5s timeout; logs "mysql: connected" - OnStop: db.Close(); logs "mysql: closing pool" - GetExecutor: returns active Tx from context (ctxTxKey) or *sql.DB; explicit nil return when db uninitialized to avoid typed-nil interface pitfall - Begin/BeginTx: wraps db.BeginTx(*sql.TxOptions); wrapped in xerrors on error - HealthCheck: delegates to Ping; Priority LevelCritical - Stats() sql.DBStats — zero value when pool uninitialized - NewUnitOfWork(logger, provider) UnitOfWork — Begin+inject+commit/rollback; no write mutex (MySQL is a server DB with internal concurrency control) - HandleError: 1062→ErrAlreadyExists, 1216/1217/1451/1452→ErrInvalidInput, sql.ErrNoRows→ErrNotFound, all others→ErrInternal - Driver imported as mysqldrv alias in errors.go to avoid package-name collision; registered via blank import in new.go Config (EINHERJAR_MYSQL_* env vars): Host, Port(3306), User, Password, Name, MaxConns(5), MinConns(2), MaxConnLifetime(1h), MaxConnIdleTime(30m), Charset(utf8mb4), Loc(UTC), ParseTime(true) - Component interface embeds observability.Identifiable; identifiable.go implements ModulePath and ModuleVersion via runtime/debug.ReadBuildInfo() — prints in launcher banner
38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
package mysql
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import (
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"database/sql"
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"errors"
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mysqldrv "github.com/go-sql-driver/mysql"
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"code.nochebuena.dev/einherjar/core/xerrors"
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)
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// HandleError maps MySQL driver and database/sql errors to typed [xerrors] values.
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// Returns nil when err is nil. Also available as [Provider.HandleError].
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//
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// Mapped codes:
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// - 1062 (ER_DUP_ENTRY) → ErrAlreadyExists
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// - 1216, 1217, 1451, 1452 (FK errors) → ErrInvalidInput
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// - sql.ErrNoRows → ErrNotFound
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// - all others → ErrInternal
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func HandleError(err error) error {
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if err == nil {
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return nil
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}
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var mysqlErr *mysqldrv.MySQLError
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if errors.As(err, &mysqlErr) {
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switch mysqlErr.Number {
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case 1062:
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return xerrors.New(xerrors.ErrAlreadyExists, "record already exists").WithError(err)
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case 1216, 1217, 1451, 1452:
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return xerrors.New(xerrors.ErrInvalidInput, "data integrity violation").WithError(err)
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}
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}
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if errors.Is(err, sql.ErrNoRows) {
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return xerrors.New(xerrors.ErrNotFound, "record not found").WithError(err)
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}
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return xerrors.New(xerrors.ErrInternal, "unexpected database error").WithError(err)
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}
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