Use a Custom Logger instead of Async Logger

[fabirydel]

Is is possible to use a custom logger instead of the default Async Logger? I have been struggling to find a way to achieve this

[ioquatix]

What problem are you trying to solve? What is a custom logger.

[fabirydel]

I need to change the format of the outgoing messages, instead of outputting a string like "info: Starting server [pid=33039] [2021-05-08 08:18:13 +0100]", I need a Json:

{
  severity: 'INFO',
  message: 'Starting server',
  timestamp: '2021-05-08 08:18:13 +0100',
  pid: 33039,
  other_args: {
    ...
  },
  ....
}

I have a custom logger class that is a subclass of Ruby's Logger that takes care of all the parsing and formatting but can't find a way to tell the app to use it for by default instead of Console::Logger.

I've tried doing this when initializing the app and locally it does seem to work.

Async do
  Async.logger = CustomLogger.new($stdout, level: Logger::INFO)
end

But when I run the app on GCP's CloudRun, which sends any log sent to stdout into CloudLogging, I see plain string again. Perhaps the problem is related to CloudRun and not Falcon directly, I've just not found what it is yet.

Thanks in advance for any help!

[ioquatix]

Console logger already does this by default. Just output it to a file (or anything other than a TTY) and it will write JSON. Does that solve your problem?

You might need the latest version of the logger to get this.

[fabirydel]

Ok I see, and how do I go about changing the default output of the Console Logger from within the Falcon framework? Is that what I need to do then?

[ioquatix]

It automatically picks it up you shouldn't need to do anything. Just make sure you are using the latest version.

[ioquatix]

Here is an example: https://github.com/socketry/falcon/runs/2532727154?check_suite_focus=true#step:5:56

GitHub Actions doesn't present a TTY (lol) so it assumes it's logging to a file and outputs JSON.

[fabirydel]

Hey, thanks for the help so far, but unfortunately it hasn't solved my problem. I actually need to use a different Logger than Console Logger. I'm shipping my Falcon app's logs to GCP and I need to be able to use Google's CloudLogging logger. Their documentation says to add use Google::Cloud::Logging::Middleware in the Rack middleware configuration code, where would that be in a Falcon app?

If that is not possible, ideally I could just do something like we do on a Rails app, but I haven't figured out how yet:

configuration do |config|
  logger = MyCustomGoogleLogger.new(etc)
end

Thanks again for any help!

[ioquatix]

use Google::Cloud::Logging::Middleware in the Rack middleware configuration code

In config.ru.

You can tee the output into a logger using a different output but we don't have any google specific output adapters.