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use std::net::SocketAddr;
use std::sync::Arc;
use std::time::Duration;
use bytes::IntoBuf;
use futures::stream::futures_unordered::FuturesUnordered;
use futures::stream::StreamExt;
use futures_util::future::FutureExt;
use hyper::client::Client;
use hyper::{Body, Method, Request, StatusCode};
use crate::data::*;
use crate::error::Error;
use crate::membership::System;
use crate::proto::Message;
pub async fn rpc_call_many(
sys: Arc<System>,
to: &[UUID],
msg: &Message,
timeout: Duration,
) -> Vec<Result<Message, Error>> {
let mut resp_stream = to
.iter()
.map(|to| rpc_call(sys.clone(), to, msg, timeout))
.collect::<FuturesUnordered<_>>();
let mut results = vec![];
while let Some(resp) = resp_stream.next().await {
results.push(resp);
}
results
}
pub async fn rpc_try_call_many(
sys: Arc<System>,
to: &[UUID],
msg: &Message,
stop_after: usize,
timeout: Duration,
) -> Result<Vec<Message>, Error> {
let mut resp_stream = to
.iter()
.map(|to| rpc_call(sys.clone(), to, msg, timeout))
.collect::<FuturesUnordered<_>>();
let mut results = vec![];
let mut errors = vec![];
while let Some(resp) = resp_stream.next().await {
match resp {
Ok(msg) => {
results.push(msg);
if results.len() >= stop_after {
break;
}
}
Err(e) => {
errors.push(e);
}
}
}
if results.len() >= stop_after {
Ok(results)
} else {
let mut msg = "Too many failures:".to_string();
for e in errors {
msg += &format!("\n{}", e);
}
Err(Error::Message(msg))
}
}
pub async fn rpc_call(
sys: Arc<System>,
to: &UUID,
msg: &Message,
timeout: Duration,
) -> Result<Message, Error> {
let addr = {
let members = sys.members.read().await;
match members.status.get(to) {
Some(status) => status.addr.clone(),
None => return Err(Error::Message(format!("Peer ID not found"))),
}
};
sys.rpc_client.call(&addr, msg, timeout).await
}
pub struct RpcClient {
pub client: Client<hyper::client::HttpConnector, hyper::Body>,
}
impl RpcClient {
pub fn new() -> Self {
RpcClient {
client: Client::new(),
}
}
pub async fn call(
&self,
to_addr: &SocketAddr,
msg: &Message,
timeout: Duration,
) -> Result<Message, Error> {
let uri = format!("http://{}/rpc", to_addr);
let req = Request::builder()
.method(Method::POST)
.uri(uri)
.body(Body::from(rmp_to_vec_all_named(msg)?))?;
let resp_fut = self.client.request(req).fuse();
let resp = tokio::time::timeout(timeout, resp_fut).await??;
if resp.status() == StatusCode::OK {
let body = hyper::body::to_bytes(resp.into_body()).await?;
let msg = rmp_serde::decode::from_read::<_, Message>(body.into_buf())?;
match msg {
Message::Error(e) => Err(Error::RPCError(e)),
x => Ok(x),
}
} else {
Err(Error::RPCError(format!("Status code {}", resp.status())))
}
}
}
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