Пример #1
0
func Example_stringer() {
	err0 := errors.New("err0")
	err1 := errors.Wrap(err0, "err1")
	err2 := func() error { return errors.Wrap(err1, "err2") }()
	err3 := func() error { return errors.Wrap(err2, "err3") }()

	fmt.Println(err3)                         // fmt.Println(err3.Error())
	fmt.Println(err3.(fmt.Stringer).String()) // print json string
}
Пример #2
0
func Example_wraped() {
	err0 := errors.New("err0")
	err1 := errors.Wrap(err0, "err1")
	err2 := func() error { return errors.Wrap(err1, "err2") }()
	err3 := func() error { return errors.Wrap(err2, "err3") }()

	fmt.Println(err3)
	for j, x := range err3.(errors.Error).Caller() {
		if j == 0 {
			// Closure path is different between Go1.4 and Go1.5
			ver := runtime.Version()
			if strings.HasPrefix(ver, "go1.3") || strings.HasPrefix(ver, "go1.4") {
				if x.FuncName == "github.com/chai2010/errors_test.func" {
					x.FuncName = "github.com/chai2010/errors_test.Example_wraped.func"
				}
			}
		}
		fmt.Printf("caller:%d: %s\n", j, x.FuncName)
	}
	for i, err := range err3.(errors.Error).Wraped() {
		fmt.Printf("wraped:%d: %v\n", i, err)
		for j, x := range err.(errors.Error).Caller() {
			fmt.Printf("    caller:%d: %s\n", j, x.FuncName)
		}
	}
	// Output:
	// err3 -> {err2 -> {err1 -> {err0}}}
	// caller:0: github.com/chai2010/errors_test.Example_wraped.func
	// caller:1: github.com/chai2010/errors_test.Example_wraped
	// caller:2: testing.runExample
	// caller:3: testing.RunExamples
	// caller:4: testing.(*M).Run
	// caller:5: main.main
	// wraped:0: err2 -> {err1 -> {err0}}
	//     caller:0: github.com/chai2010/errors_test.Example_wraped.func
	//     caller:1: github.com/chai2010/errors_test.Example_wraped
	//     caller:2: testing.runExample
	//     caller:3: testing.RunExamples
	//     caller:4: testing.(*M).Run
	//     caller:5: main.main
	// wraped:1: err1 -> {err0}
	//     caller:0: github.com/chai2010/errors_test.Example_wraped
	//     caller:1: testing.runExample
	//     caller:2: testing.RunExamples
	//     caller:3: testing.(*M).Run
	//     caller:4: main.main
	// wraped:2: err0
	//     caller:0: github.com/chai2010/errors_test.Example_wraped
	//     caller:1: testing.runExample
	//     caller:2: testing.RunExamples
	//     caller:3: testing.(*M).Run
	//     caller:4: main.main
}
Пример #3
0
func Example() {
	err0 := errors.New("err0")
	err1 := errors.Wrap(err0, "err1")
	err2 := func() error { return errors.Wrap(err1, "err2") }()
	err3 := func() error { return errors.Wrap(err2, "err3") }()

	fmt.Println(err0)
	fmt.Println(err1)
	fmt.Println(err2)
	fmt.Println(err3)
	// Output:
	// err0
	// err1 -> {err0}
	// err2 -> {err1 -> {err0}}
	// err3 -> {err2 -> {err1 -> {err0}}}
}
Пример #4
0
func Example_wraped() {
	err0 := errors.New("err0")
	err1 := errors.Wrap(err0, "err1")
	err2 := func() error { return errors.Wrap(err1, "err2") }()
	err3 := func() error { return errors.Wrap(err2, "err3") }()

	fmt.Println(err3)
	for j, x := range err3.(errors.Error).Caller() {
		fmt.Printf("caller:%d: %s\n", j, x.FuncName)
	}
	for i, err := range err3.(errors.Error).Wraped() {
		fmt.Printf("wraped:%d: %v\n", i, err)
		for j, x := range err.(errors.Error).Caller() {
			fmt.Printf("    caller:%d: %s\n", j, x.FuncName)
		}
	}
	// Output:
	// err3 -> {err2 -> {err1 -> {err0}}}
	// caller:0: github.com/chai2010/errors_test.Example_wraped.func2
	// caller:1: github.com/chai2010/errors_test.Example_wraped
	// caller:2: testing.runExample
	// caller:3: testing.RunExamples
	// caller:4: testing.(*M).Run
	// caller:5: main.main
	// wraped:0: err2 -> {err1 -> {err0}}
	//     caller:0: github.com/chai2010/errors_test.Example_wraped.func1
	//     caller:1: github.com/chai2010/errors_test.Example_wraped
	//     caller:2: testing.runExample
	//     caller:3: testing.RunExamples
	//     caller:4: testing.(*M).Run
	//     caller:5: main.main
	// wraped:1: err1 -> {err0}
	//     caller:0: github.com/chai2010/errors_test.Example_wraped
	//     caller:1: testing.runExample
	//     caller:2: testing.RunExamples
	//     caller:3: testing.(*M).Run
	//     caller:4: main.main
	// wraped:2: err0
	//     caller:0: github.com/chai2010/errors_test.Example_wraped
	//     caller:1: testing.runExample
	//     caller:2: testing.RunExamples
	//     caller:3: testing.(*M).Run
	//     caller:4: main.main
}
Пример #5
0
func Example_json() {
	err0 := errors.New("err0")
	err1 := errors.Wrap(err0, "err1")
	err2 := func() error { return errors.Wrap(err1, "err2") }()
	err3 := func() error { return errors.Wrap(err2, "err3") }()

	err3JsonData, err := json.Marshal(err3)
	if err != nil {
		log.Fatal(err)
	}

	errx := errors.MustFromJson(string(err3JsonData))
	if !reflect.DeepEqual(errx, err3) {
		log.Fatal("errors_test.Example_json:", errx, "!=", err3)
	}

	fmt.Println("done")
	// Output:
	// done
}