slog-vmodule - Module based level filter Drain for [slog-rs]

Features

Filter Drain provides fine-grained control over logging at the module(logger name) level. Examples: With flag foo=debug,bar=error and default level INFO, a debug log will only be drain if it's from foo but not from bar. And logs from bar must have a at least ERROR level to pass. Other logs without module name continue to adopt the default INFO setting.

Usage

``` // ...

let vmodule: HashMap<String, Level> = [
    ("foo".to_owned(), Level::Debug),
    ("bar".to_owned(), Level::Error),
]
.iter()
.cloned()
.collect();
// Or parse from flag string
//let vmodule: HashMap<String, Level> = ModLevelFilterConfig("foo=debug,bar=error".to_string()).into();

// Module name key("module" here) is configurable. Use whatever you like.
let filter =
    ModLevelFilter::new(drain, "module".to_owned(), Level::Warning, vmodule).fuse();

// Logger for different modules
let root_log = Logger::root(filter.fuse(), o!());
let foo_log = root_log.new(o!("module" => "foo"));
let bar_log = root_log.new(o!("module" => "bar"));

info!(root_log, "Not Pass");
info!(foo_log, "Pass");
info!(bar_log, "Not Pass");

// ...

```