Example #1
0
func TestContext(t *testing.T) {
	t.Parallel()
	buf := &bytes.Buffer{}
	logger := log.NewLogfmtLogger(buf)

	kvs := []interface{}{"a", 123}
	lc := log.NewContext(logger).With(kvs...)
	kvs[1] = 0 // With should copy its key values

	lc = lc.With("b", "c") // With should stack
	if err := lc.Log("msg", "message"); err != nil {
		t.Fatal(err)
	}
	if want, have := "a=123 b=c msg=message\n", buf.String(); want != have {
		t.Errorf("\nwant: %shave: %s", want, have)
	}

	buf.Reset()
	lc = lc.WithPrefix("p", "first")
	if err := lc.Log("msg", "message"); err != nil {
		t.Fatal(err)
	}
	if want, have := "p=first a=123 b=c msg=message\n", buf.String(); want != have {
		t.Errorf("\nwant: %shave: %s", want, have)
	}
}
Example #2
0
func TestDefaultLevels(t *testing.T) {
	buf := bytes.Buffer{}
	logger := levels.New(log.NewLogfmtLogger(&buf))

	logger.Debug("msg", "résumé") // of course you'd want to do this
	if want, have := "level=debug msg=résumé\n", buf.String(); want != have {
		t.Errorf("want %#v, have %#v", want, have)
	}

	buf.Reset()
	logger.Info("msg", "Åhus")
	if want, have := "level=info msg=Åhus\n", buf.String(); want != have {
		t.Errorf("want %#v, have %#v", want, have)
	}

	buf.Reset()
	logger.Error("msg", "© violation")
	if want, have := "level=error msg=\"© violation\"\n", buf.String(); want != have {
		t.Errorf("want %#v, have %#v", want, have)
	}

	buf.Reset()
	logger.Crit("msg", "	")
	if want, have := "level=crit msg=\"\\t\"\n", buf.String(); want != have {
		t.Errorf("want %#v, have %#v", want, have)
	}
}
Example #3
0
func ExampleLevels() {
	logger := levels.New(log.NewLogfmtLogger(os.Stdout))
	logger.Debug("msg", "hello")
	logger.With("context", "foo").Warn("err", "error")

	// Output:
	// level=debug msg=hello
	// level=warn context=foo err=error
}
Example #4
0
func ExampleContext() {
	logger := log.NewLogfmtLogger(os.Stdout)
	logger.Log("foo", 123)
	ctx := log.NewContext(logger).With("level", "info")
	ctx.Log()
	ctx = ctx.With("msg", "hello")
	ctx.Log()
	ctx.With("a", 1).Log("b", 2)

	// Output:
	// foo=123
	// level=info
	// level=info msg=hello
	// level=info msg=hello a=1 b=2
}
Example #5
0
func TestSwapLogger(t *testing.T) {
	var logger log.SwapLogger

	// Zero value does not panic or error.
	err := logger.Log("k", "v")
	if got, want := err, error(nil); got != want {
		t.Errorf("got %v, want %v", got, want)
	}

	buf := &bytes.Buffer{}
	json := log.NewJSONLogger(buf)
	logger.Swap(json)

	if err := logger.Log("k", "v"); err != nil {
		t.Error(err)
	}
	if got, want := buf.String(), `{"k":"v"}`+"\n"; got != want {
		t.Errorf("got %v, want %v", got, want)
	}

	buf.Reset()
	prefix := log.NewLogfmtLogger(buf)
	logger.Swap(prefix)

	if err := logger.Log("k", "v"); err != nil {
		t.Error(err)
	}
	if got, want := buf.String(), "k=v\n"; got != want {
		t.Errorf("got %v, want %v", got, want)
	}

	buf.Reset()
	logger.Swap(nil)

	if err := logger.Log("k", "v"); err != nil {
		t.Error(err)
	}
	if got, want := buf.String(), ""; got != want {
		t.Errorf("got %v, want %v", got, want)
	}
}