GELF message with missing fields is dropped

[jalogisch]

Expected Behavior

If a message send via GELF (TCP) is missing some specifications or a field that should not only be visible when switching the log to debug.

https://github.com/Graylog2/graylog2-server/blob/2.2.3/graylog2-server/src/main/java/org/graylog2/shared/buffers/processors/DecodingProcessor.java#L179-L186

Current Behavior

GELF Message missing a field - short_message for example the message silently disappear.

Possible Solution

Change the logging level in case the decoding does not work.

Steps to Reproduce (for bugs)

1. Create GELF TCP Input
2. send a message with whitespaced short message

echo -e '{"version": "1.1","host":"example.org","short_message":" ","full_message":"Backtrace here\n\nmore stuff","level":1,"_user_id":9001,"_some_info":"foo","_some_env_var":"bar"}\0' | nc -w 1 GRAYLOG_SERVER 12201

3. To verify send a working message

echo -e '{"version": "1.1","host":"example.org","short_message":"Short","full_message":"Backtrace here\n\nmore stuff","level":1,"_user_id":9001,"_some_info":"foo","_some_env_var":"bar"}\0' | nc -w 1 GRAYLOG_SERVER 12201

4. Change log level to debug to see that the message with empty short_message is discarded

Your Environment

• Graylog Version: 2.2.3