Rene Nochebuena
4b58f8e3d9
Introduces code.nochebuena.dev/einherjar/db-postgres — the PostgreSQL database starter for the Einherjar framework. Absorbs the postgres package from micro-lib, replacing fmt.Errorf wrapping with core/xerrors and migrating from pgx v4 to pgx v5. Interfaces (CT-6: one TypeSpec per file): - Executor — Exec, Query, QueryRow (pgx-native types) - Tx — Executor + Commit(ctx), Rollback(ctx) - 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: pgxpool.NewWithConfig with duration parsing; 30s timeout - OnStart: PING with 5s timeout; logs "postgres: connected" - OnStop: pool.Close(); logs "postgres: closing pool" - GetExecutor: returns active Tx from context (ctxTxKey) or pool; nil-safe - Begin/BeginTx: wraps pgx.TxOptions; wrapped in xerrors on error - HealthCheck: delegates to Ping; Priority LevelCritical - Stats() *pgxpool.Stat — zero value when pool uninitialized - NewUnitOfWork(logger, provider) UnitOfWork — Begin+inject+commit/rollback - HandleError: UniqueViolation→ErrAlreadyExists, ForeignKey/Check→ErrInvalidInput, pgx.ErrNoRows→ErrNotFound, all others→ErrInternal Config (EINHERJAR_PG_* env vars): Host, Port(5432), User, Password, Name, SSLMode(disable), Timezone(UTC), MaxConns(5), MinConns(2), MaxConnLifetime(1h), MaxConnIdleTime(30m), HealthCheckPeriod(1m) - Component interface embeds observability.Identifiable; identifiable.go implements ModulePath and ModuleVersion via runtime/debug.ReadBuildInfo() — prints in launcher banner
46 lines
1.5 KiB
Go
46 lines
1.5 KiB
Go
package postgres
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import (
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"errors"
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"github.com/jackc/pgerrcode"
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"github.com/jackc/pgx/v5"
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"github.com/jackc/pgx/v5/pgconn"
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"code.nochebuena.dev/einherjar/core/xerrors"
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)
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// HandleError maps pgx and PostgreSQL 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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// - UniqueViolation → ErrAlreadyExists
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// - ForeignKeyViolation → ErrInvalidInput
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// - CheckViolation → ErrInvalidInput
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// - pgx.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 pgErr *pgconn.PgError
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if errors.As(err, &pgErr) {
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switch pgErr.Code {
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case pgerrcode.UniqueViolation:
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return xerrors.New(xerrors.ErrAlreadyExists, "record already exists").
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WithContext("constraint", pgErr.ConstraintName).WithError(err)
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case pgerrcode.ForeignKeyViolation:
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return xerrors.New(xerrors.ErrInvalidInput, "data integrity violation").
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WithContext("table", pgErr.TableName).WithError(err)
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case pgerrcode.CheckViolation:
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return xerrors.New(xerrors.ErrInvalidInput, "data constraint violation").
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WithContext("table", pgErr.TableName).
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WithContext("column", pgErr.ColumnName).WithError(err)
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}
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}
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if errors.Is(err, pgx.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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