package zerolog_test import ( "bytes" "fmt" "io/ioutil" "os" "strings" "testing" "time" "github.com/rs/zerolog" ) func ExampleConsoleWriter() { log := zerolog.New(zerolog.ConsoleWriter{Out: os.Stdout, NoColor: true}) log.Info().Str("foo", "bar").Msg("Hello World") // Output: INF Hello World foo=bar } func ExampleConsoleWriter_customFormatters() { out := zerolog.ConsoleWriter{Out: os.Stdout, NoColor: true} out.FormatLevel = func(i interface{}) string { return strings.ToUpper(fmt.Sprintf("%-6s|", i)) } out.FormatFieldName = func(i interface{}) string { return fmt.Sprintf("%s:", i) } out.FormatFieldValue = func(i interface{}) string { return strings.ToUpper(fmt.Sprintf("%s", i)) } log := zerolog.New(out) log.Info().Str("foo", "bar").Msg("Hello World") // Output: INFO | Hello World foo:BAR } func ExampleNewConsoleWriter() { out := zerolog.NewConsoleWriter() out.NoColor = true // For testing purposes only log := zerolog.New(out) log.Debug().Str("foo", "bar").Msg("Hello World") // Output: DBG Hello World foo=bar } func ExampleNewConsoleWriter_customFormatters() { out := zerolog.NewConsoleWriter( func(w *zerolog.ConsoleWriter) { // Customize time format w.TimeFormat = time.RFC822 // Customize level formatting w.FormatLevel = func(i interface{}) string { return strings.ToUpper(fmt.Sprintf("[%-5s]", i)) } }, ) out.NoColor = true // For testing purposes only log := zerolog.New(out) log.Info().Str("foo", "bar").Msg("Hello World") // Output: [INFO ] Hello World foo=bar } func TestConsoleLogger(t *testing.T) { t.Run("Numbers", func(t *testing.T) { buf := &bytes.Buffer{} log := zerolog.New(zerolog.ConsoleWriter{Out: buf, NoColor: true}) log.Info(). Float64("float", 1.23). Uint64("small", 123). Uint64("big", 1152921504606846976). Msg("msg") if got, want := strings.TrimSpace(buf.String()), " INF msg big=1152921504606846976 float=1.23 small=123"; got != want { t.Errorf("\ngot:\n%s\nwant:\n%s", got, want) } }) } func TestConsoleWriter(t *testing.T) { t.Run("Default field formatter", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: true, PartsOrder: []string{"foo"}} _, err := w.Write([]byte(`{"foo" : "DEFAULT"}`)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := "DEFAULT foo=DEFAULT\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) t.Run("Write colorized", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: false} _, err := w.Write([]byte(`{"level" : "warn", "message" : "Foobar"}`)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := "\x1b[90m\x1b[0m \x1b[31mWRN\x1b[0m Foobar\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) t.Run("Write fields", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: true} d := time.Unix(0, 0).UTC().Format(time.RFC3339) _, err := w.Write([]byte(`{"time" : "` + d + `", "level" : "debug", "message" : "Foobar", "foo" : "bar"}`)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := "12:00AM DBG Foobar foo=bar\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) t.Run("Write colorized fields", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: false} _, err := w.Write([]byte(`{"level" : "warn", "message" : "Foobar", "foo": "bar"}`)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := "\x1b[90m\x1b[0m \x1b[31mWRN\x1b[0m Foobar \x1b[36mfoo=\x1b[0mbar\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) t.Run("Write error field", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: true} d := time.Unix(0, 0).UTC().Format(time.RFC3339) evt := `{"time" : "` + d + `", "level" : "error", "message" : "Foobar", "aaa" : "bbb", "error" : "Error"}` // t.Log(evt) _, err := w.Write([]byte(evt)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := "12:00AM ERR Foobar error=Error aaa=bbb\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) t.Run("Write caller field", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: true} cwd, err := os.Getwd() if err != nil { t.Fatalf("Cannot get working directory: %s", err) } d := time.Unix(0, 0).UTC().Format(time.RFC3339) evt := `{"time" : "` + d + `", "level" : "debug", "message" : "Foobar", "foo" : "bar", "caller" : "` + cwd + `/foo/bar.go"}` // t.Log(evt) _, err = w.Write([]byte(evt)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := "12:00AM DBG foo/bar.go > Foobar foo=bar\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) t.Run("Write JSON field", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: true} evt := `{"level" : "debug", "message" : "Foobar", "foo" : [1, 2, 3], "bar" : true}` // t.Log(evt) _, err := w.Write([]byte(evt)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := " DBG Foobar bar=true foo=[1,2,3]\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) } func TestConsoleWriterConfiguration(t *testing.T) { t.Run("Sets TimeFormat", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: true, TimeFormat: time.RFC3339} d := time.Unix(0, 0).UTC().Format(time.RFC3339) evt := `{"time" : "` + d + `", "level" : "info", "message" : "Foobar"}` _, err := w.Write([]byte(evt)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := "1970-01-01T00:00:00Z INF Foobar\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) t.Run("Sets PartsOrder", func(t *testing.T) { buf := &bytes.Buffer{} w := zerolog.ConsoleWriter{Out: buf, NoColor: true, PartsOrder: []string{"message", "level"}} evt := `{"level" : "info", "message" : "Foobar"}` _, err := w.Write([]byte(evt)) if err != nil { t.Errorf("Unexpected error when writing output: %s", err) } expectedOutput := "Foobar INF\n" actualOutput := buf.String() if actualOutput != expectedOutput { t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput) } }) } func BenchmarkConsoleWriter(b *testing.B) { b.ResetTimer() b.ReportAllocs() var msg = []byte(`{"level" : "info", "foo" : "bar", "message" : "HELLO", "time" : "1990-01-01"}`) w := zerolog.ConsoleWriter{Out: ioutil.Discard, NoColor: false} for i := 0; i < b.N; i++ { w.Write(msg) } }