1 unstable release
0.1.0 | Feb 10, 2020 |
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#40 in #glib
14KB
185 lines
A simple logger that integrates with glib message logging mechanism. The logger is useful when one wants to integrate a piece of Rust code into a larger application which is already using glib/gio stack.
Example
use std::env;
use log;
fn main() {
env::set_var("G_MESSAGES_DEBUG", "all");
glib_logger::init(&glib_logger::SIMPLE);
log::set_max_level(log::LevelFilter::Debug);
log::info!("info message: {}", 2);
log::warn!("warning message: {}", "foobar");
log::debug!("Hello, world!");
}
Equivalent Vala code:
public void main() {
Environment.set_variable ("G_MESSAGES_DEBUG", "all", false);
info("info message: %d", 2);
warning("warning message: %s", "foobar");
debug("Hello, world!");
}
Running:
$ ./glib_logger_test
** INFO: 20:18:34.074: src/main.rs:12: info message: 2
** (process:39403): WARNING **: 20:18:34.076: src/main.rs:13: warning message: foobar
** (process:39403): DEBUG: 20:18:34.076: src/main.rs:15: Hello, world!
Details
Due to slight differences between the meaning of respective log levels, the crate takes certain liberties. Specifically the log level mappings are:
Level::Trace
,Level::Debug
=> G_LOG_LEVEL_DEBUGLevel::Error
=> G_LOG_LEVEL_CRITICALLevel::Info
=> G_LOG_LEVEL_INFOLevel::Warn
=> G_LOG_LEVEL_WARNING
The G_LOG_LEVEL_ERROR (as produced via g_error()
macro in C) is not mapped to
any of log::Level
enum values. The reason is that g_error()
is fatal, while
log::error!()
is not.
The formatting is done fully in Rust. However, log filtering based on level is
done in Glib. It is advisable to set G_MESSAGES_DEBUG=all
environment variable.
Using Glib a domain can be set per file by using #define G_LOG_DOMAIN "my-domain"
directly in C code. This functionality is not avaialble when using
glib_logger
, all logs are emitted with a NULL domain.
Dependencies
~450KB