GELF codec should support compression

[flyingflo]

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Use Cases

Currently, the GELF codec fails to decode compressed messages received via UDP.

GELF supports compression:

When using UDP as transport layer, GELF messages can be sent uncompressed or compressed with either GZIP or ZLIB. Graylog nodes automatically detect the compression type in the GELF magic byte header. Decide if you want to trade a bit more CPU load for saving network bandwidth. GZIP is the protocol default.

Attempted Solutions

If I understand that correctly, decompression is just not yet implemented.

Proposal

The Graylog GELF decoder decides whether it is gzip, zlib, or uncompressed by looking a the magic numbers in the first bytes, then decompress accordingly. It also detects Chunking (#13292) this way.

References

13292

4868

Version

No response

[flyingflo]

Another example in Go from grafana.

I should learn Rust :thinking:

[jorgehermo9]

I'm planning to implement this once my GELF chunking PR #20859 is merged.

Actually, I have decompression kind of working, but wanted to wait until it's merged so the PR is not bloated with a lot of changes.

I'd appreciate if you could wait until #20859 is merged and I submit the decompression PR

@flyingflo

[flyingflo]

Thank you for your work @jorgehermo9! Take your time complete it.