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refactor server worker

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This commit is contained in:
Nikolay Kim 2019-12-04 15:12:02 +06:00
parent 0a4fe22003
commit c4e2051327
3 changed files with 121 additions and 88 deletions
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2
actix-server/src/lib.rs
View File

@ -25,7 +25,7 @@ pub(crate) struct Token(usize);
impl Token { impl Token {
pub(crate) fn next(&mut self) -> Token { pub(crate) fn next(&mut self) -> Token {
let token = Token(self.0 + 1); let token = Token(self.0);
self.0 += 1; self.0 += 1;
token token
} }

1
actix-server/src/service.rs
View File

@ -86,7 +86,6 @@ where
let _ = f.await; let _ = f.await;
drop(guard); drop(guard);
} }
.boxed_local(),
); );
ok(()) ok(())
} else { } else {

204
actix-server/src/worker.rs
View File

@ -2,7 +2,7 @@ use std::pin::Pin;
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering}; use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
use std::sync::Arc; use std::sync::Arc;
use std::task::{Context, Poll}; use std::task::{Context, Poll};
use std::{mem, time}; use std::time;
use actix_rt::time::{delay, Delay}; use actix_rt::time::{delay, Delay};
use actix_rt::{spawn, Arbiter}; use actix_rt::{spawn, Arbiter};
@ -128,7 +128,7 @@ impl WorkerAvailability {
pub(crate) struct Worker { pub(crate) struct Worker {
rx: UnboundedReceiver<WorkerCommand>, rx: UnboundedReceiver<WorkerCommand>,
rx2: UnboundedReceiver<StopCommand>, rx2: UnboundedReceiver<StopCommand>,
services: Vec<Option<(usize, BoxedServerService)>>, services: Vec<WorkerService>,
availability: WorkerAvailability, availability: WorkerAvailability,
conns: Counter, conns: Counter,
factories: Vec<Box<dyn InternalServiceFactory>>, factories: Vec<Box<dyn InternalServiceFactory>>,
@ -136,6 +136,29 @@ pub(crate) struct Worker {
shutdown_timeout: time::Duration, shutdown_timeout: time::Duration,
} }
struct WorkerService {
factory: usize,
status: WorkerServiceStatus,
service: BoxedServerService,
}
impl WorkerService {
fn created(&mut self, service: BoxedServerService) {
self.service = service;
self.status = WorkerServiceStatus::Unavailable;
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
enum WorkerServiceStatus {
Available,
Unavailable,
Failed,
Restarting,
Stopping,
Stopped,
}
impl Worker { impl Worker {
pub(crate) fn start( pub(crate) fn start(
rx: UnboundedReceiver<WorkerCommand>, rx: UnboundedReceiver<WorkerCommand>,
@ -172,11 +195,13 @@ impl Worker {
match res { match res {
Ok(services) => { Ok(services) => {
for item in services { for item in services {
for (idx, token, service) in item { for (factory, token, service) in item {
while token.0 >= wrk.services.len() { assert_eq!(token.0, wrk.services.len());
wrk.services.push(None); wrk.services.push(WorkerService {
} factory,
wrk.services[token.0] = Some((idx, service)); service,
status: WorkerServiceStatus::Available,
});
} }
} }
} }
@ -187,52 +212,71 @@ impl Worker {
} }
wrk.await wrk.await
} }
.boxed_local(),
); );
} }
fn shutdown(&mut self, force: bool) { fn shutdown(&mut self, force: bool) {
if force { if force {
self.services.iter_mut().for_each(|h| { self.services.iter_mut().for_each(|srv| {
if let Some(h) = h { if srv.status == WorkerServiceStatus::Available {
let _ = h.1.call((None, ServerMessage::ForceShutdown)); srv.status = WorkerServiceStatus::Stopped;
actix_rt::spawn(
srv.service
.call((None, ServerMessage::ForceShutdown))
.map(|_| ()),
);
} }
}); });
} else { } else {
let timeout = self.shutdown_timeout; let timeout = self.shutdown_timeout;
self.services.iter_mut().for_each(move |h| { self.services.iter_mut().for_each(move |srv| {
if let Some(h) = h { if srv.status == WorkerServiceStatus::Available {
let _ = h.1.call((None, ServerMessage::Shutdown(timeout))); srv.status = WorkerServiceStatus::Stopping;
actix_rt::spawn(
srv.service
.call((None, ServerMessage::Shutdown(timeout)))
.map(|_| ()),
);
} }
}); });
} }
} }
fn check_readiness( fn check_readiness(&mut self, cx: &mut Context<'_>) -> Result<bool, (Token, usize)> {
&mut self,
trace: bool,
cx: &mut Context<'_>,
) -> Result<bool, (Token, usize)> {
let mut ready = self.conns.available(cx); let mut ready = self.conns.available(cx);
let mut failed = None; let mut failed = None;
for (token, service) in &mut self.services.iter_mut().enumerate() { for (idx, srv) in &mut self.services.iter_mut().enumerate() {
if let Some(service) = service { if srv.status == WorkerServiceStatus::Available
match service.1.poll_ready(cx) { || srv.status == WorkerServiceStatus::Unavailable
{
match srv.service.poll_ready(cx) {
Poll::Ready(Ok(_)) => { Poll::Ready(Ok(_)) => {
if trace { if srv.status == WorkerServiceStatus::Unavailable {
trace!( trace!(
"Service {:?} is available", "Service {:?} is available",
self.factories[service.0].name(Token(token)) self.factories[srv.factory].name(Token(idx))
); );
srv.status = WorkerServiceStatus::Available;
}
}
Poll::Pending => {
ready = false;
if srv.status == WorkerServiceStatus::Available {
trace!(
"Service {:?} is unavailable",
self.factories[srv.factory].name(Token(idx))
);
srv.status = WorkerServiceStatus::Unavailable;
} }
} }
Poll::Pending => ready = false,
Poll::Ready(Err(_)) => { Poll::Ready(Err(_)) => {
error!( error!(
"Service {:?} readiness check returned error, restarting", "Service {:?} readiness check returned error, restarting",
self.factories[service.0].name(Token(token)) self.factories[srv.factory].name(Token(idx))
); );
failed = Some((Token(token), service.0)); failed = Some((Token(idx), srv.factory));
srv.status = WorkerServiceStatus::Failed;
} }
} }
} }
@ -246,7 +290,6 @@ impl Worker {
} }
enum WorkerState { enum WorkerState {
None,
Available, Available,
Unavailable(Vec<Conn>), Unavailable(Vec<Conn>),
Restarting( Restarting(
@ -254,7 +297,11 @@ enum WorkerState {
Token, Token,
Pin<Box<dyn Future<Output = Result<Vec<(Token, BoxedServerService)>, ()>>>>, Pin<Box<dyn Future<Output = Result<Vec<(Token, BoxedServerService)>, ()>>>>,
), ),
Shutdown(Delay, Delay, oneshot::Sender<bool>), Shutdown(
Pin<Box<Delay>>,
Pin<Box<Delay>>,
Option<oneshot::Sender<bool>>,
),
} }
impl Future for Worker { impl Future for Worker {
@ -277,9 +324,9 @@ impl Future for Worker {
if num != 0 { if num != 0 {
info!("Graceful worker shutdown, {} connections", num); info!("Graceful worker shutdown, {} connections", num);
self.state = WorkerState::Shutdown( self.state = WorkerState::Shutdown(
delay(time::Instant::now() + time::Duration::from_secs(1)), Box::pin(delay(time::Instant::now() + time::Duration::from_secs(1))),
delay(time::Instant::now() + self.shutdown_timeout), Box::pin(delay(time::Instant::now() + self.shutdown_timeout)),
result, Some(result),
); );
} else { } else {
let _ = result.send(true); let _ = result.send(true);
@ -293,49 +340,33 @@ impl Future for Worker {
} }
} }
let state = mem::replace(&mut self.state, WorkerState::None); match self.state {
WorkerState::Unavailable(ref mut conns) => {
match state { let conn = conns.pop();
WorkerState::Unavailable(mut conns) => { match self.check_readiness(cx) {
match self.check_readiness(true, cx) {
Ok(true) => { Ok(true) => {
self.state = WorkerState::Available;
// process requests from wait queue // process requests from wait queue
while let Some(msg) = conns.pop() { if let Some(conn) = conn {
match self.check_readiness(false, cx) {
Ok(true) => {
let guard = self.conns.get(); let guard = self.conns.get();
let _ = self.services[msg.token.0] let _ = self.services[conn.token.0]
.as_mut() .service
.expect("actix net bug") .call((Some(guard), ServerMessage::Connect(conn.io)));
.1 } else {
.call((Some(guard), ServerMessage::Connect(msg.io))); self.state = WorkerState::Available;
}
Ok(false) => {
trace!("Worker is unavailable");
self.state = WorkerState::Unavailable(conns);
return self.poll(cx);
}
Err((token, idx)) => {
trace!(
"Service {:?} failed, restarting",
self.factories[idx].name(token)
);
self.state = WorkerState::Restarting(
idx,
token,
self.factories[idx].create(),
);
return self.poll(cx);
}
}
}
self.availability.set(true); self.availability.set(true);
}
self.poll(cx) self.poll(cx)
} }
Ok(false) => { Ok(false) => {
self.state = WorkerState::Unavailable(conns); // push connection back to queue
if let Some(conn) = conn {
match self.state {
WorkerState::Unavailable(ref mut conns) => {
conns.push(conn);
}
_ => (),
}
}
Poll::Pending Poll::Pending
} }
Err((token, idx)) => { Err((token, idx)) => {
@ -343,22 +374,24 @@ impl Future for Worker {
"Service {:?} failed, restarting", "Service {:?} failed, restarting",
self.factories[idx].name(token) self.factories[idx].name(token)
); );
self.services[token.0].status = WorkerServiceStatus::Restarting;
self.state = self.state =
WorkerState::Restarting(idx, token, self.factories[idx].create()); WorkerState::Restarting(idx, token, self.factories[idx].create());
self.poll(cx) self.poll(cx)
} }
} }
} }
WorkerState::Restarting(idx, token, mut fut) => { WorkerState::Restarting(idx, token, ref mut fut) => {
match Pin::new(&mut fut).poll(cx) { match Pin::new(fut).poll(cx) {
Poll::Ready(Ok(item)) => { Poll::Ready(Ok(item)) => {
for (token, service) in item { for (token, service) in item {
trace!( trace!(
"Service {:?} has been restarted", "Service {:?} has been restarted",
self.factories[idx].name(token) self.factories[idx].name(token)
); );
self.services[token.0] = Some((idx, service)); self.services[token.0].created(service);
self.state = WorkerState::Unavailable(Vec::new()); self.state = WorkerState::Unavailable(Vec::new());
return self.poll(cx);
} }
} }
Poll::Ready(Err(_)) => { Poll::Ready(Err(_)) => {
@ -368,40 +401,42 @@ impl Future for Worker {
); );
} }
Poll::Pending => { Poll::Pending => {
self.state = WorkerState::Restarting(idx, token, fut); // self.state = WorkerState::Restarting(idx, token, fut);
return Poll::Pending; return Poll::Pending;
} }
} }
self.poll(cx) self.poll(cx)
} }
WorkerState::Shutdown(mut t1, mut t2, tx) => { WorkerState::Shutdown(ref mut t1, ref mut t2, ref mut tx) => {
let num = num_connections(); let num = num_connections();
if num == 0 { if num == 0 {
let _ = tx.send(true); let _ = tx.take().unwrap().send(true);
Arbiter::current().stop(); Arbiter::current().stop();
return Poll::Ready(()); return Poll::Ready(());
} }
// check graceful timeout // check graceful timeout
match Pin::new(&mut t2).poll(cx) { match t2.as_mut().poll(cx) {
Poll::Pending => (), Poll::Pending => (),
Poll::Ready(_) => { Poll::Ready(_) => {
let _ = tx.take().unwrap().send(false);
self.shutdown(true); self.shutdown(true);
let _ = tx.send(false);
Arbiter::current().stop(); Arbiter::current().stop();
return Poll::Ready(()); return Poll::Ready(());
} }
} }
// sleep for 1 second and then check again // sleep for 1 second and then check again
match Pin::new(&mut t1).poll(cx) { match t1.as_mut().poll(cx) {
Poll::Pending => (), Poll::Pending => (),
Poll::Ready(_) => { Poll::Ready(_) => {
t1 = delay(time::Instant::now() + time::Duration::from_secs(1)); *t1 = Box::pin(delay(
let _ = Pin::new(&mut t1).poll(cx); time::Instant::now() + time::Duration::from_secs(1),
));
let _ = t1.as_mut().poll(cx);
} }
} }
self.state = WorkerState::Shutdown(t1, t2, tx); // self.state = WorkerState::Shutdown(t1, t2, tx);
Poll::Pending Poll::Pending
} }
WorkerState::Available => { WorkerState::Available => {
@ -409,13 +444,11 @@ impl Future for Worker {
match Pin::new(&mut self.rx).poll_next(cx) { match Pin::new(&mut self.rx).poll_next(cx) {
// handle incoming tcp stream // handle incoming tcp stream
Poll::Ready(Some(WorkerCommand(msg))) => { Poll::Ready(Some(WorkerCommand(msg))) => {
match self.check_readiness(false, cx) { match self.check_readiness(cx) {
Ok(true) => { Ok(true) => {
let guard = self.conns.get(); let guard = self.conns.get();
let _ = self.services[msg.token.0] let _ = self.services[msg.token.0]
.as_mut() .service
.expect("actix-server bug")
.1
.call((Some(guard), ServerMessage::Connect(msg.io))); .call((Some(guard), ServerMessage::Connect(msg.io)));
continue; continue;
} }
@ -430,6 +463,8 @@ impl Future for Worker {
self.factories[idx].name(token) self.factories[idx].name(token)
); );
self.availability.set(false); self.availability.set(false);
self.services[token.0].status =
WorkerServiceStatus::Restarting;
self.state = WorkerState::Restarting( self.state = WorkerState::Restarting(
idx, idx,
token, token,
@ -447,7 +482,6 @@ impl Future for Worker {
} }
} }
} }
WorkerState::None => panic!(),
} }
} }
} }