tracing-web

A tracing compatible subscriber layer for web platforms.

Documentation

Overview

tracing-web can be used in conjunction with the tracing-subscriber crate to quickly install a subscriber that emits messages to the dev-tools console, and events to the Performance API. An example configuration can look like

use tracing_web::{MakeWebConsoleWriter, performance_layer};
use tracing_subscriber::fmt::format::Pretty;
use tracing_subscriber::prelude::*;

fn main() {
    let fmt_layer = tracing_subscriber::fmt::layer()
        .with_ansi(false) // Only partially supported across browsers
        .without_time()   // std::time is not available in browsers, see note below
        .with_writer(MakeWebConsoleWriter::new()); // write events to the console
    let perf_layer = performance_layer()
        .with_details_from_fields(Pretty::default());

    tracing_subscriber::registry()
        .with(fmt_layer)
        .with(perf_layer)
        .init(); // Install these as subscribers to tracing events

    todo!("write your awesome application");
}

Note: You can alternatively use .with_timer(UtcTime::rfc_3339()) with UtcTime on web targets if you enable the wasm-bindgen feature of the time crate, for example by adding the following to your Cargo.toml.

time = { version = "0.3", features = ["wasm-bindgen"] }

License

This project is dual licensed under the MIT license and the Apache license.