Add example how to filter by crate/module about log4rs HOT 5 CLOSED

I would expect that to work - the additive and appender fields aren't necessary unless there are other loggers attached to the root that you don't want nickel stuff to go to. Are you seeing nickel messages still logged at trace?

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I found out the reason, and what exactly I'd like to have improved in the documentation: %M prints the module from which a message comes. All the verbose output which I wanted to suppress came from hyper/mime, which hadn't been in my log config...

Here's an example which correctly moves three modules to another appender:

log.toml

[appender.bymodule]
kind = "console"
pattern = "module=%M %d %m"

[appender.stderr]
kind = "console"
pattern = "STDERR %d %m"

[root]
level = "trace"
appenders = ["stderr"]

[[logger]]
name = "nickel"
level = "trace"
appenders = ["bymodule"]
additive = false

[[logger]]
name = "hyper"
level = "trace"
appenders = ["bymodule"]
additive = false

[[logger]]
name = "mime"
level = "trace"
appenders = ["bymodule"]
additive = false

main.rs

#[macro_use]
extern crate log;
extern crate log4rs;

#[macro_use]
extern crate nickel;

use nickel::{Nickel, HttpRouter};

fn main() {
    log4rs::init_file("log.toml", Default::default()).unwrap();

    let mut server = Nickel::new();

    server.utilize(router! {
        get "**" => |_req, _res| {
            debug!("my own debug message");
            error!("my own error message");
            "Hello world!"
        }
    });

    server.listen("127.0.0.1:6767");
}

Cargo.toml

[package]
name = "log4rs-restrict-module"
version = "0.1.0"
authors = ["Andreas Sommer <bar@foo>"]

[dependencies.hyper]
version = "*"
default-features = false # don't build SSL
[dependencies.nickel]
version = "*"

[dependencies.log]
version = "*"

[dependencies.log4rs]
version = "*"

from log4rs.

I'm unfortunately not quite sure I know the right documentation change to make here - could you make a PR with the adjustment?

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I'm going to close this out, but again, feel free to open a PR with documentation improvements!

from log4rs.

The documentation update in 2c69f51 makes it clearer how to have separate loggers per module, so I'm fine with that. Thanks!

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