Parsing Node out log

[osgafarov]

Hi guys,

Is there a support in logagent for parsing logs of the following format:

�[0mGET /styles.db0a1697fcca0b6b5960.bundle.css �[36m304 �[0m0.515 ms - -�[0m
[0mGET /assets/loader.css �[36m304 �[0m0.569 ms - -�[0m

Thanks!

[otisg]

You can always write a custom parsing rule (in patterns.yml). See https://sematext.com/docs/logagent/parser/

[osgafarov]

Ok, so there is none. Thanks! I will implement it.

[otisg]

What sort of application emits such logs? Is this from a custom application you wrote or something that many other people use? If it's the latter, it would be great if you could contribute your pattern through a PR.

[osgafarov]

These logs are from an Angular app. Will post a PR once I implement it.

[otisg]

Great, thanks!

[megastef]

I think what you need to do is removing the ANSI escape sequences for terminal colour codes.
The docker plugin has this functionality too.

See:
https://github.com/sematext/logagent-js/blob/master/lib/plugins/input/docker/docker.js#L7
https://github.com/sematext/logagent-js/blob/master/lib/plugins/input/docker/docker.js#L110

We could first implement an input-filter to make the removal of ANSI escape sequences a general feature.
The rest would just be a new pattern definition in patterns.yml.

You can find here an example of an input-filter: https://github.com/sematext/logagent-js/blob/master/lib/plugins/input-filter/grep.js