Function Example_contextual

log/example_test.go:32–60

()

}

func Example_contextual() {
	logger := log.NewLogfmtLogger(os.Stdout)

	type Task struct {
		ID  int
		Cmd string
	}

	taskHelper := func(cmd string, logger log.Logger) {
		// execute(cmd)
		logger.Log("cmd", cmd, "dur", 42*time.Millisecond)
	}

	RunTask := func(task Task, logger log.Logger) {
		logger = log.With(logger, "taskID", task.ID)
		logger.Log("event", "starting task")

		taskHelper(task.Cmd, logger)

		logger.Log("event", "task complete")
	}

	RunTask(Task{ID: 1, Cmd: "echo Hello, world!"}, logger)

	// Output:
	// taskID=1 event="starting task"
	// taskID=1 cmd="echo Hello, world!" dur=42ms
	// taskID=1 event="task complete"
}

func Example_valuer() {
	logger := log.NewLogfmtLogger(os.Stdout)