Logrus: Is it possible to log a data struct or JSON object so we don't have to enumerate/list the fields?

[edwindvinas]

Hi,

Thanks for sharing the nice logger.
I just want check if this has a functionality to log a JSON or a data struct?

Example:
log.WithFields(&jsonObject).Info("A JSON object is logged from mongodb!")
log.WithFields(&tableStruct).Info("A data struct is logged from datastore!")

Best Regards,
Edwin

[aybabtme]

You'll need to pass a logrus.Field{"name": &jsonObject} and then that jsonObject will be printed as JSON if you use the JSONFormatter.

[RongxinZhang]

@aybabtme Is there an example that you can show? I just tried the below and the response was a bunch on weird encoding:

please advise:

Logger:

jsonStr := []string{"1", "2", "3"}
jsonObj, _ := json.Marshal(jsonStr)
fmt.Println(string(jsonObj))

log.WithFields(log.Fields{
  "json": &jsonObj, 
}).Info("message")

Result:

{"json":"WyIxIiwiMiIsIjMiXQ==","level":"info","msg":"message","time":"2016-05-06T15:07:52-07:00"}

[aybabtme]

do:

jsonStr := []string{"1", "2", "3"}
log.WithFields(log.Fields{
  "json": jsonStr, 
}).Info("message")

[mlsaito]

For those who will stumble upon the same problem in the future.
You can display the actual map or data struc without having to convert it to JSON:

Logger:

// Get HTTP GET parameters as a map
getParameters, _ := url.ParseQuery(r.URL.RawQuery)

log.WithFields(logrus.Fields{
  "getParameters": getParameters,
}).Info("Request received!")

Result:

{"getParameters":{"from":["verify"],"text":["SampleMessage!"],"to":["817031805898"]},"level":"info","msg":"Request received!","time":"2018-04-12 17:32:48"}

If you use logrus.Field{"name": &jsonObject} it wouldn't display the actual value as @RongxinZhang mentioned.

And if you convert the JSON to a string, you'll have a lot of escape characters which is not friendly with services such as Loggly:

// Get HTTP GET parameters as a map
getParameters, _ := url.ParseQuery(r.URL.RawQuery)
getParametersJson, err := json.Marshal(getParameters)

log.WithFields(logrus.Fields{
  "getParameters": string(getParametersJson),
}).Info("Request received!")

Result:

{"getParameters":"{\"from\":[\"verify\"],\"text\":[\"SampleMessage!\"],\"to\":[\"817031805898\"]}","level":"info","msg":"Request received!","time":"2018-04-12 16:05:18"}