component.go

package postgres

import (
	"code.nochebuena.dev/einherjar/contracts/lifecycle"
	"code.nochebuena.dev/einherjar/contracts/observability"
	"github.com/jackc/pgx/v5/pgxpool"
)

// Component bundles the full postgres capability: lifecycle management,
// health reporting, and the database [Provider] interface.
// Register with launcher and health before starting.
type Component interface {
	lifecycle.Component
	observability.Checkable
	observability.Identifiable
	Provider
	// Stats returns connection pool statistics. Returns a zero-value stat
	// when the pool has not been initialized yet.
	Stats() *pgxpool.Stat
}
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 (`
			`"code.nochebuena.dev/einherjar/contracts/lifecycle"`
			`"code.nochebuena.dev/einherjar/contracts/observability"`
			`"github.com/jackc/pgx/v5/pgxpool"`
			`)`

			`// Component bundles the full postgres capability: lifecycle management,`
			`// health reporting, and the database [Provider] interface.`
			`// Register with launcher and health before starting.`
			`type Component interface {`
			`lifecycle.Component`
			`observability.Checkable`
			`observability.Identifiable`
			`Provider`
			`// Stats returns connection pool statistics. Returns a zero-value stat`
			`// when the pool has not been initialized yet.`
			`Stats() *pgxpool.Stat`
			`}`