tracing-actix-web provides [TracingLogger], a middleware to log request and response info when using the [actix-web] framework.
[TracingLogger] is designed as a drop-in replacement of [actix-web]'s [Logger].
[Logger] is built on top of the [log] crate: you need to use regular expressions to parse the request information out of the logged message.
[TracingLogger] relies on [tracing], a modern instrumentation framework for structured logging: all request information is captured as a machine-parsable set of key-value pairs.
It also enables propagation of context information to children spans.
Add tracing-actix-web to your dependencies:
```toml
[dependencies]
tracing-actix-web = "0.1"
If you are using [`cargo-edit`](https://github.com/killercup/cargo-edit), run
bash
cargo add tracing-actix-web
```
Register TracingLogger as a middleware for your application using .wrap on App.
Add a Subscriber implementation to output logs to the console.
```rust use actixweb::middleware::Logger; use actixweb::App; use tracing::{Subscriber, subscriber::setglobaldefault}; use tracingactixweb::TracingLogger; use tracingbunyanformatter::{BunyanFormattingLayer, JsonStorageLayer}; use tracing_subscriber::{layer::SubscriberExt, EnvFilter, Registry};
/// Compose multiple layers into a tracing's subscriber.
pub fn getsubscriber(
name: String,
envfilter: String
) -> impl Subscriber + Send + Sync {
let envfilter = EnvFilter::tryfromdefaultenv()
.unwrapor(EnvFilter::new(envfilter));
let formattinglayer = BunyanFormattingLayer::new(
name.into(),
std::io::stdout
);
Registry::default()
.with(envfilter)
.with(JsonStorageLayer)
.with(formatting_layer)
}
/// Register a subscriber as global default to process span data. /// /// It should only be called once! pub fn initsubscriber(subscriber: impl Subscriber + Send + Sync) { LogTracer::init().expect("Failed to set logger"); setglobal_default(subscriber).expect("Failed to set subscriber"); }
fn main() { let subscriber = getsubscriber("app".into(), "info".into()); initsubscriber(subscriber);
let app = App::new().wrap(TracingLogger);
} ```