log4rs handle support

[tylerhawkes]

I'd like to be able to use sentry with log4rs while still being able to change the log4rs config. Currently I'm using log4rs and I dynamically reload the config whenever the file changes using inotify. To do this, the init function of log4rs returns a handle that I keep in a static mut. After looking at the examples and the code, I don't see how that's possible right now since the init call doesn't return anything. I'm happy to use any workarounds that might be available.

[bbigras]

How do you use log4rs with sentry? With sentry::integrations::log? Do you have an example?

[mitsuhiko]

You could make a proxy I assume. Sentry's log integration just dispatches to another logger.

[tylerhawkes]

We don't use it yet, but are considering it. Even just an example of how to use it with something other than env logger would be great.

[msrd0]

I'd like to see something with rust/log4rs similar to java/logback, where I can add sentry as an appender that will upload all messages with warn level or higher. Code could look similar to this:

let sentry = SentryAppender::builder()
		// ...
		.build();
	
let config = Config::builder()
		// ...
		.appender(Appender::builder().build("sentry", Box::new(sentry)))
		// ...
		.build(Root::builder().appender("sentry").build(LevelFilter::Warn))
		.unwrap();

[msrd0]

I've now made https://crates.io/crates/log4rs-sentry to get the desired behaviour