native/Consumer: Replace panics on formatter errors with a simple fal…

…lback text (#10)

native/consumer/writer.go

@@ -22,7 +22,7 @@ type Writer struct {
 	Formatter formatter.Formatter
 
 	// Interceptor can be used to intercept the consumption of an event shortly
-	// before the actual consumption or directly afterwards. If nothing was
+	// before the actual consumption or directly afterward. If nothing was
 	// provided interceptor.Default will be used.
 	Interceptor interceptor.Interceptor
 
@@ -39,12 +39,12 @@ type Writer struct {
 	// additional performance costs.
 	Synchronized bool
 
-	// OnFormatError will be called if there as any kind of error while
+	// OnFormatError will be called if their as any kind of error while
 	// formatting an log.Event using the configured Formatter. If nothing was
-	// provided these errors will result in a panic.
+	// provided these errors will result in a fallback message of the event.
 	OnFormatError func(*Writer, io.Writer, error)
 
-	// OnColorInitializationError will be called if there as any kind of error
+	// OnColorInitializationError will be called if their as any kind of error
 	// while initialize the color support. If nothing was provided these errors
 	// will be silently swallowed.
 	OnColorInitializationError func(*Writer, io.Writer, error)
@@ -100,7 +100,7 @@ func (instance *Writer) Consume(event log.Event, source log.CoreLogger) {
 		if v := instance.OnFormatError; v != nil {
 			v(instance, out, err)
 		} else {
-			panic(fmt.Errorf("cannot format event %v: %w", event, err))
+			content = []byte(fmt.Sprintf("LOG_EVENT_FORMAT_ERROR (event: %v, error: %v)", event, err))
 		}
 	}
 

native/consumer/writer_test.go

@@ -68,11 +68,9 @@ func Test_Writer_Consume_panicsOnFormatErrors(t *testing.T) {
 		})
 	})
 
-	assert.Execution(t, func() {
-		instance.Consume(givenEvent, givenLogger)
-	}).WillPanicWith("cannot format event .+?: expected")
+	instance.Consume(givenEvent, givenLogger)
 
-	assert.ToBeEqual(t, "", givenOut.String())
+	assert.ToBeMatching(t, "^LOG_EVENT_FORMAT_ERROR \\(event: .+?, error: expected\\)$", givenOut.String())
 }
 
 func Test_Writer_Consume_callsHookOnFormatErrors(t *testing.T) {