Rene Nochebuena
0acf4da97e
Introduces code.nochebuena.dev/einherjar/db-sqlite — the SQLite database starter for the Einherjar framework. Absorbs the sqlite package from micro-lib using the pure-Go modernc.org/sqlite driver (no CGO, cross-compilation compatible). 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, Ping, HandleError - Component — lifecycle.Component + observability.Checkable + Provider - UnitOfWork — Do(ctx, fn) Implementation: - New(logger, cfg) Component — pool not created until OnInit - OnInit: sql.Open with DSN (Path + Pragmas); sets MaxOpenConns, MaxIdleConns - OnStart: Ping with 5s timeout; logs "sqlite: connected" - OnStop: db.Close(); logs "sqlite: 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: wraps db.BeginTx; wrapped in xerrors on error - HealthCheck: delegates to Ping; Priority LevelDegraded (file DB; absence is non-fatal on a server restart — file always present if configured) - NewUnitOfWork(logger, provider) UnitOfWork — acquires writeMu before Begin to prevent SQLITE_BUSY under concurrent goroutines (SQLite single-writer model) - writeMu: extracted from *sqliteImpl via type assertion in NewUnitOfWork; gracefully skipped when provider is a mock (nil mu) - HandleError: sql.ErrNoRows→ErrNotFound, unique/pk constraint→ErrAlreadyExists, foreign key→ErrInvalidInput, all others→ErrInternal Config (EINHERJAR_SQLITE_* env vars): Path(required), MaxOpenConns(1), MaxIdleConns(1), Pragmas(?_journal=WAL&_timeout=5000&_fk=true) - Component interface embeds observability.Identifiable; identifiable.go implements ModulePath and ModuleVersion via runtime/debug.ReadBuildInfo() — prints in launcher banner
19 lines
721 B
Go
19 lines
721 B
Go
package sqlite
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import "context"
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// Provider is the database access interface consumed by repositories and services.
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// All methods are safe for concurrent use.
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type Provider interface {
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// GetExecutor returns the active transaction injected by [UnitOfWork] if one
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// is present in ctx, otherwise returns the connection pool.
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GetExecutor(ctx context.Context) Executor
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// Begin starts a new transaction.
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Begin(ctx context.Context) (Tx, error)
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// Ping verifies that the database connection is alive.
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Ping(ctx context.Context) error
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// HandleError maps a database/sql or SQLite error to a typed [xerrors] value.
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// Call this at every point where a database error is first observed.
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HandleError(err error) error
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}
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