Function NewLogHandler

lambdacontext/logger.go:54–74

NewLogHandler returns a [slog.Handler] for AWS Lambda structured logging. It reads AWS_LAMBDA_LOG_FORMAT and AWS_LAMBDA_LOG_LEVEL from environment, and injects requestId from Lambda context into each log record. By default, only requestId is injected. Use WithFunctionARN or WithTenantID to include

(opts ...LogOption)

// By default, only requestId is injected. Use WithFunctionARN or WithTenantID to include more.
// See the package examples for usage.
func NewLogHandler(opts ...LogOption) slog.Handler {
	options := &logOptions{}
	for _, opt := range opts {
		opt(options)
	}

	level := parseLogLevel()
	handlerOpts := &slog.HandlerOptions{
		Level:       level,
		ReplaceAttr: ReplaceAttr,
	}

	var h slog.Handler
	if logFormat == "JSON" {
		h = slog.NewJSONHandler(os.Stdout, handlerOpts)
	} else {
		h = slog.NewTextHandler(os.Stdout, handlerOpts)
	}

	return &lambdaHandler{handler: h, fields: options.fields}
}

// NewLogger returns a [*slog.Logger] configured for AWS Lambda structured logging.
// This is a convenience function equivalent to slog.New(NewLogHandler(opts...)).