web3-proxy/web3_proxy/src/rpcs/request.rs

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use super::connection::Web3Connection;
use super::provider::Web3Provider;
use std::fmt;
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use std::sync::atomic;
use std::sync::Arc;
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use tokio::time::{sleep, Duration, Instant};
use tracing::warn;
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use tracing::{instrument, trace};
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#[derive(Debug)]
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pub enum OpenRequestResult {
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Handle(OpenRequestHandle),
/// Unable to start a request. Retry at the given time.
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RetryAt(Instant),
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/// Unable to start a request. Retrying will not succeed.
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RetryNever,
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}
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/// Make RPC requests through this handle and drop it when you are done.
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#[derive(Debug)]
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pub struct OpenRequestHandle(Arc<Web3Connection>);
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impl OpenRequestHandle {
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pub fn new(connection: Arc<Web3Connection>) -> Self {
// TODO: attach a unique id to this? customer requests have one, but not internal queries
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// TODO: what ordering?!
connection
.active_requests
.fetch_add(1, atomic::Ordering::AcqRel);
// TODO: handle overflows?
// TODO: what ordering?
connection
.total_requests
.fetch_add(1, atomic::Ordering::Relaxed);
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Self(connection)
}
pub fn clone_connection(&self) -> Arc<Web3Connection> {
self.0.clone()
}
/// Send a web3 request
/// By having the request method here, we ensure that the rate limiter was called and connection counts were properly incremented
/// By taking self here, we ensure that this is dropped after the request is complete
#[instrument(skip_all)]
pub async fn request<T, R>(
&self,
method: &str,
params: T,
) -> Result<R, ethers::prelude::ProviderError>
where
T: fmt::Debug + serde::Serialize + Send + Sync,
R: serde::Serialize + serde::de::DeserializeOwned + fmt::Debug,
{
// TODO: use tracing spans properly
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// TODO: requests from customers have request ids, but we should add
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// TODO: including params in this is way too verbose
trace!("Sending {} to {}", method, self.0);
let mut provider = None;
while provider.is_none() {
match self.0.provider.read().await.as_ref() {
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None => {
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warn!(rpc=%self.0, "no provider!");
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// TODO: how should this work? a reconnect should be in progress. but maybe force one now?
// TODO: sleep how long? subscribe to something instead?
sleep(Duration::from_millis(100)).await
}
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Some(found_provider) => provider = Some(found_provider.clone()),
}
}
let response = match &*provider.unwrap() {
Web3Provider::Http(provider) => provider.request(method, params).await,
Web3Provider::Ws(provider) => provider.request(method, params).await,
};
// TODO: i think ethers already has trace logging (and does it much more fancy)
// TODO: at least instrument this with more useful information
// trace!("Reply from {}: {:?}", self.0, response);
trace!("Reply from {}", self.0);
response
}
}
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impl Drop for OpenRequestHandle {
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fn drop(&mut self) {
self.0
.active_requests
.fetch_sub(1, atomic::Ordering::AcqRel);
}
}