Rocket Sentry

rocket-sentry is a simple add-on for the Rocket web framework to simplify integration with the Sentry application monitoring system.

Or maybe...

"The Rocket Sentry is a static rocket-firing gun platform that is based on a Personality Construct and used in the Aperture Science Enrichment Center."

-- Half-Life wiki

Features

Currently rocket-sentry includes two integrations:

• Rust panic handler: when a panic happens, it is reported as a Sentry event.

• Performance Monitoring: HTTP requests are reported as Transactions, if the sentry_traces_sample_rate setting is configured or traces_sampler callback is provided (see example below).

  Transactions currently include the following fields:

  • HTTP method
  • GET query string
  • headers
  • POST data
  • cookies
  • environment
  • URL

Pull requests welcome!

Usage

rocket-sentry can be configured via Rocket.toml (sentry_dsn=) or environment variable ROCKET_SENTRY_DSN.

To use this, add the dependency to your Cargo.toml, and add the fairing to your code:

use rocket_sentry::RocketSentry;

#[launch]
fn rocket() -> _ {
    rocket::build()
        .attach(RocketSentry::fairing())
        // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   add this line
}

Then, the Sentry integration can be enabled by adding a sentry_dsn= value to the Rocket.toml file, for example:

[debug]
sentry_dsn = ""  # Disabled
[release]
sentry_dsn = "https://057006d7dfe5fff0fbed461cfca5f757@sentry.io/1111111"
sentry_traces_sample_rate = 0.2  # 20% of requests will be logged under the performance tab

Performance Monitoring

traces_sampler can be used instead of sentry_traces_sample_rate to have a more granular control over performance monitoring, see Sentry documentation.

use rocket_sentry::RocketSentry;

#[launch]
fn rocket() -> _ {
    let traces_sampler = move |ctx: &TransactionContext| -> f32 {
        match ctx.name() {
            "GET /specific/path/1" | "GET /specific/path/2" => 0.,  // Drop the performance transaction
            _ => 1.,
        }
    };
    rocket::build()
        .attach(RocketSentry::builder().traces_sampler(Arc::new(traces_sampler)).build());
}

See a more advanced example.

Testing

The functionality can be tested with the examples/panic.rs example. Just change the Rocket.toml file and run it...

cargo run --example panic

Then try accessing this URL: http://localhost:8012/panic?msg=Is+it+time+to+panic+yet?