Asynchronous logger is a performant implementation of log facade. The implementation is
based on async_logger crate, and allows non-blocking writes of
log records in memory buffer, which in turn then processed in separate thread by writer (see
more details in async_logger documentation).
Default log record format includes date, time, timezone, log level, target, and log message itself. Log record example:
[2020-03-15 11:47:32.339865887+0100 WARN thread]: log message.
The log record format, and other parameters are customizable with LoggerBuilder.
use async_logger_log::Logger;
use log::{info, warn};
let logger = Logger::new("/tmp", 256, 10*1024*1024).expect("Failed to create Logger instance");
log::set_boxed_logger(Box::new(logger)).expect("Failed to set logger");
log::set_max_level(log::LevelFilter::Info);
info!("{}", "test msg");
warn!("{}", "warning msg");
log::logger().flush();Custom writer and formatter:
use async_logger_log::Logger;
use async_logger::Writer;
use log::{debug, Record};
// Custom formatting of `log::Record`
fn custom_formatter(record: &Record) -> String {
format!("log record: {}\n", record.args())
}
struct StdoutWriter {}
// Writer simply prints log messages to stdout
impl Writer<Box<String>> for StdoutWriter {
fn process_slice(&mut self, slice: &[Box<String>]) {
for item in slice {
println!("{}", **item);
}
}
fn flush(&mut self) { }
}
let logger = Logger::builder()
.buf_size(256)
.formatter(custom_formatter)
.writer(Box::new(StdoutWriter {}))
.build()
.unwrap();
log::set_boxed_logger(Box::new(logger)).expect("Failed to set logger");
log::set_max_level(log::LevelFilter::Trace);
debug!("{}", "Hello, Wrold!");
log::logger().flush();- Dependency on
timecrate is optional and can be excluded by adding in Cargo.toml:
[dependencies.async_logger_log]
default-features = false
- This crate was tested on Linux x86_64. Rust version 1.42.
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