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db-postgres/provider.go

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feat(db-postgres): initial implementation — pgx pool with lifecycle and UnitOfWork (v1.0.0) 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
2026-05-29 15:50:20 +00:00
package postgres
import (
"context"
"github.com/jackc/pgx/v5"
)
// Provider is the database access interface consumed by repositories and services.
// All methods are safe for concurrent use.
type Provider interface {
// GetExecutor returns the active transaction injected by [UnitOfWork] if one
// is present in ctx, otherwise returns the connection pool.
GetExecutor(ctx context.Context) Executor
// Begin starts a new transaction with default options.
Begin(ctx context.Context) (Tx, error)
// BeginTx starts a new transaction with the given options.
BeginTx(ctx context.Context, opts pgx.TxOptions) (Tx, error)
// Ping verifies that the database connection is alive.
Ping(ctx context.Context) error
// HandleError maps a pgx or PostgreSQL error to a typed [xerrors] value.
// Call this at every point where a pgx error is first observed.
HandleError(err error) error
}