garage/src/rpc_client.rs

265 lines
5.9 KiB
Rust

use std::borrow::Borrow;
use std::marker::PhantomData;
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, HttpConnector};
use hyper::{Body, Method, Request};
use tokio::sync::{watch, Semaphore};
use crate::background::BackgroundRunner;
use crate::data::*;
use crate::error::Error;
use crate::membership::Status;
use crate::rpc_server::RpcMessage;
use crate::server::TlsConfig;
use crate::tls_util;
pub struct RpcClient<M: RpcMessage> {
status: watch::Receiver<Arc<Status>>,
background: Arc<BackgroundRunner>,
pub rpc_addr_client: RpcAddrClient<M>,
}
impl<M: RpcMessage + 'static> RpcClient<M> {
pub fn new(
rac: RpcAddrClient<M>,
background: Arc<BackgroundRunner>,
status: watch::Receiver<Arc<Status>>,
) -> Arc<Self> {
Arc::new(Self {
rpc_addr_client: rac,
background,
status,
})
}
pub fn by_addr(&self) -> &RpcAddrClient<M> {
&self.rpc_addr_client
}
pub async fn call<MB: Borrow<M>, N: Borrow<UUID>>(
&self,
to: N,
msg: MB,
timeout: Duration,
) -> Result<M, Error> {
let addr = {
let status = self.status.borrow().clone();
match status.nodes.get(to.borrow()) {
Some(status) => status.addr,
None => {
return Err(Error::Message(format!(
"Peer ID not found: {:?}",
to.borrow()
)))
}
}
};
self.rpc_addr_client.call(&addr, msg, timeout).await
}
pub async fn call_many(&self, to: &[UUID], msg: M, timeout: Duration) -> Vec<Result<M, Error>> {
let msg = Arc::new(msg);
let mut resp_stream = to
.iter()
.map(|to| self.call(to, msg.clone(), timeout))
.collect::<FuturesUnordered<_>>();
let mut results = vec![];
while let Some(resp) = resp_stream.next().await {
results.push(resp);
}
results
}
pub async fn try_call_many(
self: &Arc<Self>,
to: &[UUID],
msg: M,
stop_after: usize,
timeout: Duration,
) -> Result<Vec<M>, Error> {
let msg = Arc::new(msg);
let mut resp_stream = to
.to_vec()
.into_iter()
.map(|to| {
let self2 = self.clone();
let msg = msg.clone();
async move { self2.call(to, msg, timeout).await }
})
.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 {
// Continue requests in background
// TODO: make this optionnal (only usefull for write requests)
self.clone().background.spawn_cancellable(async move {
resp_stream.collect::<Vec<_>>().await;
Ok(())
});
Ok(results)
} else {
let mut msg = "Too many failures:".to_string();
for e in errors {
msg += &format!("\n{}", e);
}
Err(Error::Message(msg))
}
}
}
pub struct RpcAddrClient<M: RpcMessage> {
phantom: PhantomData<M>,
pub http_client: Arc<RpcHttpClient>,
pub path: String,
}
impl<M: RpcMessage> RpcAddrClient<M> {
pub fn new(http_client: Arc<RpcHttpClient>, path: String) -> Self {
Self {
phantom: PhantomData::default(),
http_client: http_client,
path,
}
}
pub async fn call<MB>(
&self,
to_addr: &SocketAddr,
msg: MB,
timeout: Duration,
) -> Result<M, Error>
where
MB: Borrow<M>,
{
self.http_client
.call(&self.path, to_addr, msg, timeout)
.await
}
}
pub struct RpcHttpClient {
request_limiter: Semaphore,
method: ClientMethod,
}
enum ClientMethod {
HTTP(Client<HttpConnector, hyper::Body>),
HTTPS(Client<tls_util::HttpsConnectorFixedDnsname<HttpConnector>, hyper::Body>),
}
impl RpcHttpClient {
pub fn new(
max_concurrent_requests: usize,
tls_config: &Option<TlsConfig>,
) -> Result<Self, Error> {
let method = if let Some(cf) = tls_config {
let ca_certs = tls_util::load_certs(&cf.ca_cert)?;
let node_certs = tls_util::load_certs(&cf.node_cert)?;
let node_key = tls_util::load_private_key(&cf.node_key)?;
let mut config = rustls::ClientConfig::new();
for crt in ca_certs.iter() {
config.root_store.add(crt)?;
}
config.set_single_client_cert([&node_certs[..], &ca_certs[..]].concat(), node_key)?;
let connector =
tls_util::HttpsConnectorFixedDnsname::<HttpConnector>::new(config, "garage");
ClientMethod::HTTPS(Client::builder().build(connector))
} else {
ClientMethod::HTTP(Client::new())
};
Ok(RpcHttpClient {
method,
request_limiter: Semaphore::new(max_concurrent_requests),
})
}
async fn call<M, MB>(
&self,
path: &str,
to_addr: &SocketAddr,
msg: MB,
timeout: Duration,
) -> Result<M, Error>
where
MB: Borrow<M>,
M: RpcMessage,
{
let uri = match self.method {
ClientMethod::HTTP(_) => format!("http://{}/{}", to_addr, path),
ClientMethod::HTTPS(_) => format!("https://{}/{}", to_addr, path),
};
let req = Request::builder()
.method(Method::POST)
.uri(uri)
.body(Body::from(rmp_to_vec_all_named(msg.borrow())?))?;
let resp_fut = match &self.method {
ClientMethod::HTTP(client) => client.request(req).fuse(),
ClientMethod::HTTPS(client) => client.request(req).fuse(),
};
let slot = self.request_limiter.acquire().await;
let resp = tokio::time::timeout(timeout, resp_fut)
.await
.map_err(|e| {
debug!(
"RPC timeout to {}: {}",
to_addr,
debug_serialize(msg.borrow())
);
e
})?
.map_err(|e| {
warn!(
"RPC HTTP client error when connecting to {}: {}",
to_addr, e
);
e
})?;
drop(slot);
let status = resp.status();
let body = hyper::body::to_bytes(resp.into_body()).await?;
match rmp_serde::decode::from_read::<_, Result<M, String>>(body.into_buf()) {
Err(e) => Err(Error::RPCError(
format!("Invalid reply (deserialize error: {})", e),
status,
)),
Ok(Err(e)) => Err(Error::RPCError(e, status)),
Ok(Ok(x)) => Ok(x),
}
}
}