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log

Structured logging on top of slog.

Usage

log := log.NewLogger(cfg)

log.Info("server started")
log.Infof("listening on %s", port)
log.Error("connection failed")

// With context
reqLog := log.With("request_id", reqID, "user_id", userID)
reqLog.Info("processing request")

Levels: debug, info, error. Configured via cfg.Log.Level.

JSON output if LOG_FORMAT=json, human-readable text by default.

API

type Logger interface {
    Debug(v ...any)
    Debugf(format string, a ...any)
    Info(v ...any)
    Infof(format string, a ...any)
    Error(v ...any)
    Errorf(format string, a ...any)
    With(args ...any) Logger
}

For tests: log.NewNoopLogger() or log.NewTestLogger("debug").