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use std::{
cell::RefCell,
sync::{Arc, atomic::Ordering},
};
use metainfo::MetaInfo;
use motore::service::Service;
use pilota::thrift::ThriftException;
use tokio::sync::futures::Notified;
use tracing::*;
use volo::{net::Address, volo_unreachable};
use crate::{
DummyMessage, EntryMessage, ServerError, ThriftMessage,
codec::{Decoder, Encoder},
context::{SERVER_CONTEXT_CACHE, ServerContext, ThriftContext},
protocol::TMessageType,
server_error_to_application_exception, thrift_exception_to_application_exception,
tracing::SpanProvider,
transport::should_log,
};
#[allow(clippy::too_many_arguments)]
pub async fn serve<Svc, Req, Resp, E, D, SP>(
mut encoder: E,
mut decoder: D,
notified: Notified<'_>,
exit_mark: Arc<std::sync::atomic::AtomicBool>,
service: &Svc,
stat_tracer: Arc<[crate::server::TraceFn]>,
peer_addr: Option<Address>,
span_provider: SP,
) where
Svc: Service<ServerContext, Req, Response = Resp>,
Svc::Error: Into<ServerError>,
Req: EntryMessage,
Resp: EntryMessage,
E: Encoder,
D: Decoder,
SP: SpanProvider,
{
tokio::pin!(notified);
metainfo::METAINFO
.scope(RefCell::new(MetaInfo::default()), async {
#[cfg(feature = "shmipc")]
let helper = decoder.shmipc_helper();
loop {
// new context
let mut cx = SERVER_CONTEXT_CACHE.with(|cache| {
let mut cache = cache.borrow_mut();
cache.pop().unwrap_or_default()
});
if let Some(peer_addr) = &peer_addr {
cx.rpc_info.caller_mut().set_address(peer_addr.clone());
}
let msg = tokio::select! {
_ = &mut notified => {
tracing::trace!(
"[VOLO] close conn by notified, peer_addr: {:?}",
peer_addr,
);
break;
},
out = decoder.decode(&mut cx) => out
};
debug!(
"[VOLO] received message: {:?}, cx: {:?}, peer_addr: {:?}",
msg.as_ref().map(|msg| msg.as_ref().map(|msg| &msg.meta)),
cx,
peer_addr
);
#[cfg(feature = "shmipc")]
helper.release_read_and_reuse();
// it is promised safe here, because span only reads cx before handling polling
let tracing_cx = unsafe {
std::mem::transmute::<
&crate::context::ServerContext,
&crate::context::ServerContext,
>(&cx)
};
let result = async {
match msg {
Ok(Some(ThriftMessage { data: Ok(req), .. })) => {
cx.stats.record_process_start_at();
let resp = service.call(&mut cx, req).await.map_err(Into::into);
cx.stats.record_process_end_at();
if exit_mark.load(Ordering::Relaxed) {
cx.set_conn_reset_by_ttheader(true);
}
let req_msg_type =
cx.req_msg_type.expect("`req_msg_type` should be set.");
if req_msg_type != TMessageType::OneWay {
cx.msg_type = Some(match resp {
Ok(_) => TMessageType::Reply,
Err(_) => TMessageType::Exception,
});
let msg = ThriftMessage::mk_server_resp(
&cx,
resp.map_err(server_error_to_application_exception),
);
if let Err(e) = async {
let result = encoder.encode(&mut cx, msg).await;
span_provider.leave_encode(&cx);
result
}
.instrument(span_provider.on_encode(tracing_cx))
.await
{
if should_log(&e) {
error!(
"[VOLO] server send response error: {:?}, cx: {:?}, \
peer_addr: {:?}",
e, cx, peer_addr
);
}
stat_tracer.iter().for_each(|f| f(&cx));
return Err(());
}
}
if cx.transport.is_conn_reset() {
return Err(());
}
}
Ok(Some(ThriftMessage { data: Err(_), .. })) => {
volo_unreachable!();
}
Ok(None) => {
trace!(
"[VOLO] reach eof, connection has been closed by client, \
peer_addr: {:?}",
peer_addr
);
return Err(());
}
Err(e) => {
if should_log(&e) {
error!(
"[VOLO] pingpong server decode error: {:?}, cx: {:?}, \
peer_addr: {:?}",
e, cx, peer_addr
);
}
cx.msg_type = Some(TMessageType::Exception);
cx.set_conn_reset_by_ttheader(true);
if !matches!(e, ThriftException::Transport(_)) {
let msg = ThriftMessage::mk_server_resp(
&cx,
Err::<DummyMessage, _>(
thrift_exception_to_application_exception(e),
),
);
if let Err(e) = encoder.encode(&mut cx, msg).await {
if should_log(&e) {
error!(
"[VOLO] server send error error: {:?}, cx: {:?}, \
peer_addr: {:?}",
e, cx, peer_addr
);
}
}
}
stat_tracer.iter().for_each(|f| f(&cx));
return Err(());
}
}
stat_tracer.iter().for_each(|f| f(&cx));
metainfo::METAINFO.with(|mi| {
mi.borrow_mut().clear();
});
span_provider.leave_serve(&cx);
SERVER_CONTEXT_CACHE.with(|cache| {
let mut cache = cache.borrow_mut();
if cache.len() < cache.capacity() {
cx.reset(Default::default());
cache.push(cx);
}
});
Ok(())
}
.instrument(span_provider.on_serve(tracing_cx))
.await;
if result.is_err() {
break;
}
}
})
.await;
}