How to implement the LevelWrite.WriteLevel for GCP logging?

[davidshen84]

Hi,

I am integrating zerolog with GCP logging. The Entry type only supports a string or an interface that can be marshalled by encoding/json.

However, in the WriteLevel method, I only get an array of bytes. Is that the serialised content of the log object? Is there a way to deserialise it back into an object and also make sure this object is compatible with encoding/json?

If I pass that array to the GCP logger's Payload field directly, it is treated as string and the log looks like this in the GCP console:

The log from zerolog becomes a string and is saved in the textPayload field.

{
  "textPayload": "{\"level\":\"info\",\"message\":\"content error\n\"}",
  "insertId": "====",
  "resource": {
    "type": "project",
    "labels": {
      "project_id": "===="
    }
  },
  "timestamp": "2025-08-15T01:52:38.638116838Z",
  "severity": "INFO",
  "logName": "projects/d===",
  "receiveTimestamp": "2025-08-15T01:52:38.894528999Z"
}

Thanks

[davidshen84]

	var jsonMap interface{}
	if err := json.Unmarshal(p, &jsonMap); err != nil {
		return 0, err
	}

Unmarshalling the bytes back did the trick. I guess it is not very performant.

Is there a way to get the original Log instance directly?