• Rust
• Logging

Rust/Logging

• Base crate is log to provide standard traits for different logging crates
• log4rs allows for logging config file

Tracing

log4rs

*  cargo add log  *  cargo add log4rs 

• src/log4.rs {{{#rust

use log::LevelFilter; use log4rs::append::console::{self}; use log4rs::config::{Appender, Config, Logger, Root}; use log4rs::encode::pattern::PatternEncoder; use std::sync::OnceLock;

pub fn init_log() {

• static INIT: OnceLock<()> = OnceLock::new(); // initialise only once INIT.get_or_init(|| {

  • let logfile = log4rs::append::file::FileAppender::builder()

    • build("my-log.log")
    • unwrap();
    // {d}: Timestamp of the log entry. // {l}: Log level (e.g., INFO, DEBUG). // {m}: The actual log message. // {n}: Newline character. // {h}: highlight ??

    let console = console::ConsoleAppender::builder()

    • encoder(Box::new(PatternEncoder::new(

      • "{d} {h({l})} t{t}\n {h({m}{n})}", // Add custom formatting
      )))
    • build();
    let config = Config::builder()
    • appender(Appender::builder().build("logfile", Box::new(logfile)))
    • appender(Appender::builder().build("console", Box::new(console)))
    • logger(
      • Logger::builder()
        • additive(false)

        • build("my_module", LevelFilter::Debug), // Set to Debug for detailed logs

      )

    • build(Root::builder().appender("console").build(LevelFilter::Info))

    • unwrap();
    log4rs::init_config(config).unwrap();
  });

} }}}

CategoryLogging