mstrucken commented on issue #7954:
URL: https://github.com/apache/storm/issues/7954#issuecomment-2634390738
The essential code from `multilang/resources/storm.py`:
```python
def sendMsgToParent(msg):
print(json_encode(msg))
print("end")
sys.stdout.flush()
def log(msg, level=2):
sendMsgToParent({"command": "log", "msg": msg, "level":level})
def logTrace(msg):
log(msg, 0)
def logDebug(msg):
log(msg, 1)
def logInfo(msg):
log(msg, 2)
def logWarn(msg):
log(msg, 3)
def logError(msg):
log(msg, 4)
```
The json encoded messages:
```json
{"command": "log", "msg": "Python bolt starting...", "level": 2}
{"command": "log", "msg": "This is a sample warning", "level": 3}
{"command": "log", "msg": "Error processing tuple with python...", "level":
4}
```
The message is deserialized using
`org.apache.storm.multilang.JsonSerializer`:
```java
public ShellMsg readShellMsg() throws IOException, NoOutputException {
JSONObject msg = (JSONObject)this.readMessage();
ShellMsg shellMsg = new ShellMsg();
String command = (String)msg.get("command");
// ...
if (command.equals("log")) {
Object logLevelObj = msg.get("level");
if (logLevelObj != null && logLevelObj instanceof Long) {
long logLevel = (Long)logLevelObj;
shellMsg.setLogLevel((int)logLevel);
}
}
return shellMsg;
}
```
But `logLevelObj` is not an instance of `Long` but an instance of `Integer`.
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