web3-proxy/web3_proxy/src/metered/jsonrpc_error_count.rs

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2022-09-20 09:58:40 +03:00
//! A module providing the `JsonRpcErrorCount` metric.
use ethers::providers::ProviderError;
use serde::Serialize;
use std::ops::Deref;
/// A metric counting how many times an expression typed std `Result` as
/// returned an `Err` variant.
///
/// This is a light-weight metric.
///
/// By default, `ErrorCount` uses a lock-free `u64` `Counter`, which makes sense
/// in multithread scenarios. Non-threaded applications can gain performance by
/// using a `std::cell:Cell<u64>` instead.
#[derive(Clone, Default, Debug, Serialize)]
pub struct JsonRpcErrorCount<C: Counter = AtomicInt<u64>>(pub C);
impl<C: Counter, T> Metric<Result<T, ProviderError>> for JsonRpcErrorCount<C> {}
impl<C: Counter> Enter for JsonRpcErrorCount<C> {
type E = ();
fn enter(&self) {}
}
impl<C: Counter, T> OnResult<Result<T, ProviderError>> for JsonRpcErrorCount<C> {
/// Unlike the default ErrorCount, this one does not increment for internal jsonrpc errors
/// TODO: count errors like this on another helper
fn on_result(&self, _: (), r: &Result<T, ProviderError>) -> Advice {
match r {
Ok(_) => {}
Err(ProviderError::JsonRpcClientError(_)) => {
self.0.incr();
}
Err(_) => {
// TODO: count jsonrpc errors
}
}
Advice::Return
}
}
impl<C: Counter> Clear for JsonRpcErrorCount<C> {
fn clear(&self) {
self.0.clear()
}
}
impl<C: Counter> Deref for JsonRpcErrorCount<C> {
type Target = C;
fn deref(&self) -> &Self::Target {
&self.0
}
}