Fix console writer when unix time stamp and/or no message field is used

console.go

@@ -295,7 +295,13 @@ func consoleDefaultFormatTimestamp(timeFormat string, noColor bool) Formatter {
 				t = ts.Format(timeFormat)
 			}
 		case json.Number:
+			i, err := tt.Int64()
+			if err != nil {
 				t = tt.String()
+			} else {
+				ts := time.Unix(i, 0)
+				t = ts.Format(timeFormat)
+			}
 		}
 		return colorize(t, colorDarkGray, noColor)
 	}
@@ -347,6 +353,9 @@ func consoleDefaultFormatCaller(noColor bool) Formatter {
 }
 
 func consoleDefaultFormatMessage(i interface{}) string {
+	if i == nil {
+		return ""
+	}
 	return fmt.Sprintf("%s", i)
 }
 

console_test.go

@@ -121,6 +121,44 @@ func TestConsoleWriter(t *testing.T) {
 		}
 	})
 
+	t.Run("Unix timestamp input format", func(t *testing.T) {
+		of := zerolog.TimeFieldFormat
+		defer func() {
+			zerolog.TimeFieldFormat = of
+		}()
+		zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+
+		buf := &bytes.Buffer{}
+		w := zerolog.ConsoleWriter{Out: buf, NoColor: true}
+
+		_, err := w.Write([]byte(`{"time": 0, "level": "debug", "message": "Foobar", "foo": "bar"}`))
+		if err != nil {
+			t.Errorf("Unexpected error when writing output: %s", err)
+		}
+
+		expectedOutput := "4:00PM DBG Foobar foo=bar\n"
+		actualOutput := buf.String()
+		if actualOutput != expectedOutput {
+			t.Errorf("Unexpected output %q, want: %q", actualOutput, expectedOutput)
+		}
+	})
+
+	t.Run("No message field", func(t *testing.T) {
+		buf := &bytes.Buffer{}
+		w := zerolog.ConsoleWriter{Out: buf, NoColor: true}
+
+		_, err := w.Write([]byte(`{"level": "debug", "foo": "bar"}`))
+		if err != nil {
+			t.Errorf("Unexpected error when writing output: %s", err)
+		}
+
+		expectedOutput := "<nil> DBG  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}

go.mod

@@ -1 +1,11 @@
 module github.com/rs/zerolog
+
+go 1.12
+
+require (
+	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
+	github.com/pkg/errors v0.8.1
+	github.com/rs/xid v1.2.1
+	github.com/zenazn/goji v0.9.0
+	golang.org/x/tools v0.0.0-20190425163242-31fd60d6bfdc
+)