winston 0.3.0

winston for rust
Documentation 
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mod common;

use common::DelayedTransport;
use std::time::{Duration, Instant};
use winston::{
    close, configure,
    format::{self, LogInfo},
    log,
    transports::stdout,
    Logger, LoggerOptions,
};

#[test]
fn test_default_logger() {
    log!(info, "This use the default configuration");
    log!(
        info,
        "This is the second that uses the default configuration to check queue order"
    );

    configure(Some(
        LoggerOptions::new()
            .level("debug")
            .add_transport(stdout())
            .format(format::combine(vec![format::timestamp(), format::json()])),
    ));

    log!(info, "This will use the new configuration");
    close();
}

#[test]
fn test_new_macros() {
    configure(Some(
        LoggerOptions::new()
            .level("debug")
            .add_transport(stdout())
            .format(format::combine(vec![format::timestamp(), format::json()])),
    ));

    // Basic usage
    log!(info, "Hello, world!");

    // With key-value pairs
    log!(warn, "User logged in", user_id = 123, ip = "192.168.1.1");

    // With explicit logger
    let custom_logger = Logger::builder()
        .add_transport(stdout())
        .level("debug")
        .build();
    log!(custom_logger, debug, "Custom logger message");

    close();
}

#[test]
fn test_default_logger_macros() {
    log!(info, "This is an info message");
    log!(warn, "This is a warning");

    let error = "an error";
    log!(error, format!("This is an error: {}", error));
    close();
}

#[test]
fn test_configure_on_custom_logger() {
    let logger = Logger::default();

    log!(logger, info, "This is a message from the custom logger");

    logger.configure(Some(
        LoggerOptions::new()
            .add_transport(stdout())
            .format(format::simple())
            .level("debug"),
    ));

    log!(logger, info, "This is a message from the custom logger");
}

#[test]
fn test_logger_non_blocking() {
    const NUM_MESSAGES: usize = 100;
    const PROCESS_DELAY: Duration = Duration::from_millis(100);

    let delayed_transport = DelayedTransport::new(PROCESS_DELAY);

    let logger = Logger::builder()
        .add_transport(stdout())
        .add_transport(delayed_transport)
        .format(format::pretty_print().with_option("colorize", "true"))
        .build();

    // Measure time to enqueue all messages
    let enqueue_start = Instant::now();

    for i in 0..NUM_MESSAGES {
        let log_entry = LogInfo::new("info", &format!("Test message {}", i));
        logger.log(log_entry);
    }

    let actual_enqueue_duration = enqueue_start.elapsed();

    // Calculate theoretical synchronous enqueue time
    let theoretical_sync_duration = PROCESS_DELAY * NUM_MESSAGES as u32;

    println!("Number of messages: {}", NUM_MESSAGES);
    println!("Delay per message: {:?}", PROCESS_DELAY);
    println!("Actual enqueue duration: {:?}", actual_enqueue_duration);
    println!(
        "Theoretical synchronous duration: {:?}",
        theoretical_sync_duration
    );

    // Assertions
    assert!(
        actual_enqueue_duration < theoretical_sync_duration,
        "Actual enqueue time ({:?}) should be less than theoretical synchronous time ({:?})",
        actual_enqueue_duration,
        theoretical_sync_duration
    );

    // Check that actual enqueuing was significantly faster than theoretical synchronous time
    assert!(
        actual_enqueue_duration * 5 < theoretical_sync_duration,
        "Actual enqueue time ({:?}) should be at least 5 times faster than theoretical synchronous time ({:?})",
        actual_enqueue_duration,
        theoretical_sync_duration
    );
}