1 unstable release
0.0.5 | Feb 24, 2022 |
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#8 in #tower-layer
21KB
334 lines
tower-fault
tower-fault
is a library for injecting various faults into a tower::Service
.
Layers
You can use the following layers to inject faults into a service:
ErrorLayer
- randomly inject errors into a service.LatencyLayer
- randomly add latency into a service.
Example usage
use tower_fault::{
error::ErrorLayer,
latency::LatencyLayer,
};
use tower::{service_fn, ServiceBuilder};
struct MyRequest {
value: u64
}
async fn my_service(req: MyRequest) -> Result<(), String> {
Ok(())
}
// LatencyLayer with a 10% probability of injecting 200 to 500 milliseconds
// of latency.
let latency_layer = LatencyLayer::new(0.1, 200..500);
// ErrorLayer that injects an error if the request value is greater than 10.
let error_layer = ErrorLayer::new(|req: &MyRequest| req.value > 10, |_: &MyRequest| String::from("error"));
let service = ServiceBuilder::new()
.layer(latency_layer)
.service(service_fn(my_service));
Dependencies
~1.6–3.5MB
~65K SLoC