Actix Web

Learn about monitoring your Actix Web application with Sentry.

The Sentry SDK offers a middleware for the Actix Web framework that supports:

  • Capturing server errors returned by Actix Web services.
  • Starting a transaction for each request-response cycle.

To add Sentry with the Actix Web integration to your Rust project, add a new dependency to your Cargo.toml:

Cargo.toml
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[dependencies]
actix-web = "4.11.0"
sentry = { version = "0.41.0", features = ["actix"] }

Initialize and configure the Sentry client. This will enable a set of default integrations, such as panic reporting. Then, initialize Actix Web with the Sentry middleware.

main.rs
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use std::io;

use actix_web::{get, App, Error, HttpRequest, HttpServer};

#[get("/")]
async fn failing(_req: HttpRequest) -> Result<String, Error> {
    Err(io::Error::new(io::ErrorKind::Other, "An error happens here").into())
}

fn main() -> io::Result<()> {
    let _guard = sentry::init((
        "https://examplePublicKey@o0.ingest.sentry.io/0",
        sentry::ClientOptions {
            release: sentry::release_name!(),
            // Capture all traces and spans. Set to a lower value in production
            traces_sample_rate: 1.0,
            // Capture user IPs and potentially sensitive headers when using HTTP server integrations
            // see https://docs.sentry.io/platforms/rust/data-management/data-collected for more info
            send_default_pii: true,
            // Capture all HTTP request bodies, regardless of size
            max_request_body_size: sentry::MaxRequestBodySize::Always,
            ..Default::default()
        },
    ));

    actix_web::rt::System::new().block_on(async {
        HttpServer::new(|| {
            App::new()
                .wrap(
                    sentry::integrations::actix::Sentry::builder()
                        .capture_server_errors(true) // Capture server errors
                        .start_transaction(true) // Start a transaction (Sentry root span) for each request
                        .finish(),
                )
                .service(failing)
        })
        .bind("127.0.0.1:3001")?
        .run()
        .await
    })?;

    Ok(())
}

The snippet above sets up a service that always fails, so you can test that everything is working as soon as you set it up.

Send a request to the application. The response error will be captured by Sentry.

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curl http://localhost:3001/

To view and resolve the recorded error, log into sentry.io and select your project. Clicking on the error's title will open a page where you can see detailed information and mark it as resolved.

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