mirror of
https://github.com/fafhrd91/actix-net
synced 2024-11-24 01:11:07 +01:00
refactor connection counter (#343)
* Remove restart_worker test * Remove Slab * Rework counter * Make counter limit switch accurate * Remove backpressure. Add pause state * make changes for review * fix doc comment for counter
This commit is contained in:
fakeshadow
GitHub
parent
8ad5f58d38
commit
e4d4ae21ee
@ -28,7 +28,6 @@ futures-core = { version = "0.3.7", default-features = false, features = ["alloc
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log = "0.4"
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mio = { version = "0.7.6", features = ["os-poll", "net"] }
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num_cpus = "1.13"
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slab = "0.4"
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tokio = { version = "1.2", features = ["sync"] }
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[dev-dependencies]
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@ -7,18 +7,14 @@ use actix_rt::{
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};
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use log::{error, info};
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use mio::{Interest, Poll, Token as MioToken};
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use slab::Slab;
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use crate::server::Server;
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use crate::socket::MioListener;
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use crate::waker_queue::{WakerInterest, WakerQueue, WAKER_TOKEN};
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use crate::worker::{Conn, WorkerHandleAccept};
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use crate::Token;
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struct ServerSocketInfo {
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/// Beware this is the crate token for identify socket and should not be confused
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/// with `mio::Token`.
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token: Token,
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token: usize,
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lst: MioListener,
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@ -62,7 +58,7 @@ impl AcceptLoop {
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pub(crate) fn start(
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&mut self,
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socks: Vec<(Token, MioListener)>,
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socks: Vec<(usize, MioListener)>,
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handles: Vec<WorkerHandleAccept>,
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) {
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let srv = self.srv.take().expect("Can not re-use AcceptInfo");
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@ -81,7 +77,7 @@ struct Accept {
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srv: Server,
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next: usize,
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avail: Availability,
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backpressure: bool,
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paused: bool,
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}
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/// Array of u128 with every bit as marker for a worker handle's availability.
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@ -95,23 +91,22 @@ impl Default for Availability {
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impl Availability {
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/// Check if any worker handle is available
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#[inline(always)]
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fn available(&self) -> bool {
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self.0.iter().any(|a| *a != 0)
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}
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/// Check if worker handle is available by index
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#[inline(always)]
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fn get_available(&self, idx: usize) -> bool {
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let (offset, idx) = Self::offset(idx);
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self.0[offset] & (1 << idx as u128) != 0
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}
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/// Set worker handle available state by index.
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fn set_available(&mut self, idx: usize, avail: bool) {
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let (offset, idx) = if idx < 128 {
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(0, idx)
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} else if idx < 128 * 2 {
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(1, idx - 128)
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} else if idx < 128 * 3 {
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(2, idx - 128 * 2)
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} else if idx < 128 * 4 {
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(3, idx - 128 * 3)
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} else {
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panic!("Max WorkerHandle count is 512")
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};
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let (offset, idx) = Self::offset(idx);
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let off = 1 << idx as u128;
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if avail {
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@ -128,6 +123,21 @@ impl Availability {
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self.set_available(handle.idx(), true);
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})
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}
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/// Get offset and adjusted index of given worker handle index.
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fn offset(idx: usize) -> (usize, usize) {
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if idx < 128 {
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(0, idx)
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} else if idx < 128 * 2 {
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(1, idx - 128)
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} else if idx < 128 * 3 {
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(2, idx - 128 * 2)
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} else if idx < 128 * 4 {
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(3, idx - 128 * 3)
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} else {
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panic!("Max WorkerHandle count is 512")
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}
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}
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}
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/// This function defines errors that are per-connection. Which basically
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@ -147,7 +157,7 @@ impl Accept {
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pub(crate) fn start(
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poll: Poll,
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waker: WakerQueue,
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socks: Vec<(Token, MioListener)>,
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socks: Vec<(usize, MioListener)>,
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srv: Server,
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handles: Vec<WorkerHandleAccept>,
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) {
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@ -158,10 +168,10 @@ impl Accept {
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.name("actix-server accept loop".to_owned())
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.spawn(move || {
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System::set_current(sys);
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let (mut accept, sockets) =
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let (mut accept, mut sockets) =
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Accept::new_with_sockets(poll, waker, socks, handles, srv);
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accept.poll_with(sockets);
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accept.poll_with(&mut sockets);
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})
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.unwrap();
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}
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@ -169,26 +179,25 @@ impl Accept {
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fn new_with_sockets(
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poll: Poll,
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waker: WakerQueue,
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socks: Vec<(Token, MioListener)>,
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socks: Vec<(usize, MioListener)>,
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handles: Vec<WorkerHandleAccept>,
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srv: Server,
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) -> (Accept, Slab<ServerSocketInfo>) {
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let mut sockets = Slab::new();
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for (hnd_token, mut lst) in socks.into_iter() {
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let entry = sockets.vacant_entry();
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let token = entry.key();
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) -> (Accept, Vec<ServerSocketInfo>) {
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let sockets = socks
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.into_iter()
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.map(|(token, mut lst)| {
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// Start listening for incoming connections
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poll.registry()
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.register(&mut lst, MioToken(token), Interest::READABLE)
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.unwrap_or_else(|e| panic!("Can not register io: {}", e));
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entry.insert(ServerSocketInfo {
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token: hnd_token,
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ServerSocketInfo {
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token,
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lst,
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timeout: None,
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});
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}
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})
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.collect();
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let mut avail = Availability::default();
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@ -202,19 +211,19 @@ impl Accept {
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srv,
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next: 0,
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avail,
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backpressure: false,
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paused: false,
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};
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(accept, sockets)
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}
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fn poll_with(&mut self, mut sockets: Slab<ServerSocketInfo>) {
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fn poll_with(&mut self, sockets: &mut [ServerSocketInfo]) {
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let mut events = mio::Events::with_capacity(128);
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loop {
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if let Err(e) = self.poll.poll(&mut events, None) {
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match e.kind() {
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std::io::ErrorKind::Interrupted => continue,
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io::ErrorKind::Interrupted => continue,
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_ => panic!("Poll error: {}", e),
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}
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}
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@ -222,122 +231,146 @@ impl Accept {
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for event in events.iter() {
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let token = event.token();
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match token {
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WAKER_TOKEN => {
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let exit = self.handle_waker(sockets);
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if exit {
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info!("Accept is stopped.");
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return;
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}
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}
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_ => {
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let token = usize::from(token);
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self.accept(sockets, token);
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}
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}
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}
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}
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}
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fn handle_waker(&mut self, sockets: &mut [ServerSocketInfo]) -> bool {
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// This is a loop because interests for command from previous version was
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// a loop that would try to drain the command channel. It's yet unknown
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// if it's necessary/good practice to actively drain the waker queue.
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WAKER_TOKEN => 'waker: loop {
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loop {
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// take guard with every iteration so no new interest can be added
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// until the current task is done.
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let mut guard = self.waker.guard();
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match guard.pop_front() {
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// worker notify it becomes available. we may want to recover
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// from backpressure.
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// worker notify it becomes available.
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Some(WakerInterest::WorkerAvailable(idx)) => {
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drop(guard);
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self.maybe_backpressure(&mut sockets, false);
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self.avail.set_available(idx, true);
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if !self.paused {
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self.accept_all(sockets);
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}
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}
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// a new worker thread is made and it's handle would be added to Accept
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Some(WakerInterest::Worker(handle)) => {
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drop(guard);
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// maybe we want to recover from a backpressure.
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self.maybe_backpressure(&mut sockets, false);
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self.avail.set_available(handle.idx(), true);
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self.handles.push(handle);
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if !self.paused {
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self.accept_all(sockets);
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}
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}
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// got timer interest and it's time to try register socket(s) again
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Some(WakerInterest::Timer) => {
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drop(guard);
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self.process_timer(&mut sockets)
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self.process_timer(sockets)
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}
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Some(WakerInterest::Pause) => {
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drop(guard);
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self.deregister_all(&mut sockets);
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self.paused = true;
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self.deregister_all(sockets);
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}
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Some(WakerInterest::Resume) => {
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drop(guard);
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sockets.iter_mut().for_each(|(token, info)| {
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self.register_logged(token, info);
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self.paused = false;
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sockets.iter_mut().for_each(|info| {
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self.register_logged(info);
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});
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self.accept_all(sockets);
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}
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Some(WakerInterest::Stop) => {
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return self.deregister_all(&mut sockets);
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self.deregister_all(sockets);
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return true;
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}
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// waker queue is drained
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None => {
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// Reset the WakerQueue before break so it does not grow infinitely
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WakerQueue::reset(&mut guard);
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break 'waker;
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}
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}
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},
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_ => {
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let token = usize::from(token);
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self.accept(&mut sockets, token);
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}
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return false;
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}
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}
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}
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}
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fn process_timer(&self, sockets: &mut Slab<ServerSocketInfo>) {
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fn process_timer(&self, sockets: &mut [ServerSocketInfo]) {
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let now = Instant::now();
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sockets
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.iter_mut()
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// Only sockets that had an associated timeout were deregistered.
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.filter(|(_, info)| info.timeout.is_some())
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.for_each(|(token, info)| {
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.filter(|info| info.timeout.is_some())
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.for_each(|info| {
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let inst = info.timeout.take().unwrap();
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if now < inst {
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info.timeout = Some(inst);
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} else if !self.backpressure {
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self.register_logged(token, info);
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} else if !self.paused {
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self.register_logged(info);
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}
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// Drop the timeout if server is in backpressure and socket timeout is expired.
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// When server recovers from backpressure it will register all sockets without
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// Drop the timeout if server is paused and socket timeout is expired.
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// When server recovers from pause it will register all sockets without
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// a timeout value so this socket register will be delayed till then.
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});
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}
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#[cfg(not(target_os = "windows"))]
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fn register(&self, token: usize, info: &mut ServerSocketInfo) -> io::Result<()> {
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fn register(&self, info: &mut ServerSocketInfo) -> io::Result<()> {
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let token = MioToken(info.token);
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self.poll
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.registry()
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.register(&mut info.lst, MioToken(token), Interest::READABLE)
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.register(&mut info.lst, token, Interest::READABLE)
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}
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#[cfg(target_os = "windows")]
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fn register(&self, token: usize, info: &mut ServerSocketInfo) -> io::Result<()> {
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fn register(&self, info: &mut ServerSocketInfo) -> io::Result<()> {
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// On windows, calling register without deregister cause an error.
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// See https://github.com/actix/actix-web/issues/905
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// Calling reregister seems to fix the issue.
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let token = MioToken(info.token);
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self.poll
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.registry()
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.register(&mut info.lst, mio::Token(token), Interest::READABLE)
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.register(&mut info.lst, token, Interest::READABLE)
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.or_else(|_| {
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self.poll.registry().reregister(
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&mut info.lst,
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mio::Token(token),
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Interest::READABLE,
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)
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self.poll
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.registry()
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.reregister(&mut info.lst, token, Interest::READABLE)
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})
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}
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fn register_logged(&self, token: usize, info: &mut ServerSocketInfo) {
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match self.register(token, info) {
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fn register_logged(&self, info: &mut ServerSocketInfo) {
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match self.register(info) {
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Ok(_) => info!("Resume accepting connections on {}", info.lst.local_addr()),
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Err(e) => error!("Can not register server socket {}", e),
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}
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}
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fn deregister(&self, info: &mut ServerSocketInfo) -> io::Result<()> {
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self.poll.registry().deregister(&mut info.lst)
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}
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fn deregister_logged(&self, info: &mut ServerSocketInfo) {
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match self.deregister(info) {
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match self.poll.registry().deregister(&mut info.lst) {
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Ok(_) => info!("Paused accepting connections on {}", info.lst.local_addr()),
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Err(e) => {
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error!("Can not deregister server socket {}", e)
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@ -345,7 +378,7 @@ impl Accept {
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}
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}
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fn deregister_all(&self, sockets: &mut Slab<ServerSocketInfo>) {
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fn deregister_all(&self, sockets: &mut [ServerSocketInfo]) {
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// This is a best effort implementation with following limitation:
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//
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// Every ServerSocketInfo with associate timeout will be skipped and it's timeout
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@ -358,70 +391,23 @@ impl Accept {
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.iter_mut()
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// Take all timeout.
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// This is to prevent Accept::process_timer method re-register a socket afterwards.
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.map(|(_, info)| (info.timeout.take(), info))
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.map(|info| (info.timeout.take(), info))
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// Socket info with a timeout is already deregistered so skip them.
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.filter(|(timeout, _)| timeout.is_none())
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.for_each(|(_, info)| self.deregister_logged(info));
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}
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fn maybe_backpressure(&mut self, sockets: &mut Slab<ServerSocketInfo>, on: bool) {
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// Only operate when server is in a different backpressure than the given flag.
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if self.backpressure != on {
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self.backpressure = on;
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sockets
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.iter_mut()
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// Only operate on sockets without associated timeout.
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// Sockets with it should be handled by `accept` and `process_timer` methods.
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// They are already deregistered or need to be reregister in the future.
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.filter(|(_, info)| info.timeout.is_none())
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.for_each(|(token, info)| {
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if on {
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self.deregister_logged(info);
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} else {
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self.register_logged(token, info);
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}
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});
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}
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}
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fn accept_one(&mut self, sockets: &mut Slab<ServerSocketInfo>, mut conn: Conn) {
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if self.backpressure {
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// send_connection would remove fault worker from handles.
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// worst case here is conn get dropped after all handles are gone.
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while let Err(c) = self.send_connection(sockets, conn) {
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conn = c
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}
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} else {
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while self.avail.available() {
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let next = self.next();
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let idx = next.idx();
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if next.available() {
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self.avail.set_available(idx, true);
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match self.send_connection(sockets, conn) {
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Ok(_) => return,
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Err(c) => conn = c,
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}
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} else {
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self.avail.set_available(idx, false);
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self.set_next();
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}
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}
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// Sending Conn failed due to either all workers are in error or not available.
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// Enter backpressure state and try again.
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self.maybe_backpressure(sockets, true);
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self.accept_one(sockets, conn);
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}
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}
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// Send connection to worker and handle error.
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fn send_connection(
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&mut self,
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sockets: &mut Slab<ServerSocketInfo>,
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conn: Conn,
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) -> Result<(), Conn> {
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match self.next().send(conn) {
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fn send_connection(&mut self, conn: Conn) -> Result<(), Conn> {
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let next = self.next();
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match next.send(conn) {
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Ok(_) => {
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// Increment counter of WorkerHandle.
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// Set worker to unavailable with it hit max (Return false).
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if !next.inc_counter() {
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let idx = next.idx();
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self.avail.set_available(idx, false);
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}
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self.set_next();
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Ok(())
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}
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@ -432,7 +418,6 @@ impl Accept {
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|
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if self.handles.is_empty() {
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error!("No workers");
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self.maybe_backpressure(sockets, true);
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// All workers are gone and Conn is nowhere to be sent.
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// Treat this situation as Ok and drop Conn.
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return Ok(());
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@ -445,19 +430,38 @@ impl Accept {
|
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}
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}
|
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|
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fn accept(&mut self, sockets: &mut Slab<ServerSocketInfo>, token: usize) {
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fn accept_one(&mut self, mut conn: Conn) {
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loop {
|
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let info = sockets
|
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.get_mut(token)
|
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.expect("ServerSocketInfo is removed from Slab");
|
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let next = self.next();
|
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let idx = next.idx();
|
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|
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if self.avail.get_available(idx) {
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||||
match self.send_connection(conn) {
|
||||
Ok(_) => return,
|
||||
Err(c) => conn = c,
|
||||
}
|
||||
} else {
|
||||
self.avail.set_available(idx, false);
|
||||
self.set_next();
|
||||
|
||||
if !self.avail.available() {
|
||||
while let Err(c) = self.send_connection(conn) {
|
||||
conn = c;
|
||||
}
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn accept(&mut self, sockets: &mut [ServerSocketInfo], token: usize) {
|
||||
while self.avail.available() {
|
||||
let info = &mut sockets[token];
|
||||
|
||||
match info.lst.accept() {
|
||||
Ok(io) => {
|
||||
let msg = Conn {
|
||||
io,
|
||||
token: info.token,
|
||||
};
|
||||
self.accept_one(sockets, msg);
|
||||
let conn = Conn { io, token };
|
||||
self.accept_one(conn);
|
||||
}
|
||||
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => return,
|
||||
Err(ref e) if connection_error(e) => continue,
|
||||
@ -485,11 +489,22 @@ impl Accept {
|
||||
}
|
||||
}
|
||||
|
||||
fn accept_all(&mut self, sockets: &mut [ServerSocketInfo]) {
|
||||
sockets
|
||||
.iter_mut()
|
||||
.map(|info| info.token)
|
||||
.collect::<Vec<_>>()
|
||||
.into_iter()
|
||||
.for_each(|idx| self.accept(sockets, idx))
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
fn next(&self) -> &WorkerHandleAccept {
|
||||
&self.handles[self.next]
|
||||
}
|
||||
|
||||
/// Set next worker handle that would accept connection.
|
||||
#[inline(always)]
|
||||
fn set_next(&mut self) {
|
||||
self.next = (self.next + 1) % self.handles.len();
|
||||
}
|
||||
|
||||
@ -8,30 +8,29 @@ use std::{
|
||||
|
||||
use actix_rt::{self as rt, net::TcpStream, time::sleep, System};
|
||||
use log::{error, info};
|
||||
use tokio::sync::mpsc::{unbounded_channel, UnboundedReceiver};
|
||||
use tokio::sync::oneshot;
|
||||
use tokio::sync::{
|
||||
mpsc::{unbounded_channel, UnboundedReceiver},
|
||||
oneshot,
|
||||
};
|
||||
|
||||
use crate::accept::AcceptLoop;
|
||||
use crate::join_all;
|
||||
use crate::server::{Server, ServerCommand};
|
||||
use crate::service::{InternalServiceFactory, ServiceFactory, StreamNewService};
|
||||
use crate::signals::{Signal, Signals};
|
||||
use crate::socket::{MioListener, StdSocketAddr, StdTcpListener, ToSocketAddrs};
|
||||
use crate::socket::{MioTcpListener, MioTcpSocket};
|
||||
use crate::waker_queue::{WakerInterest, WakerQueue};
|
||||
use crate::worker::{
|
||||
ServerWorker, ServerWorkerConfig, WorkerAvailability, WorkerHandleAccept,
|
||||
WorkerHandleServer,
|
||||
};
|
||||
use crate::{join_all, Token};
|
||||
use crate::worker::{ServerWorker, ServerWorkerConfig, WorkerHandleAccept, WorkerHandleServer};
|
||||
|
||||
/// Server builder
|
||||
pub struct ServerBuilder {
|
||||
threads: usize,
|
||||
token: Token,
|
||||
token: usize,
|
||||
backlog: u32,
|
||||
handles: Vec<(usize, WorkerHandleServer)>,
|
||||
services: Vec<Box<dyn InternalServiceFactory>>,
|
||||
sockets: Vec<(Token, String, MioListener)>,
|
||||
sockets: Vec<(usize, String, MioListener)>,
|
||||
accept: AcceptLoop,
|
||||
exit: bool,
|
||||
no_signals: bool,
|
||||
@ -55,7 +54,7 @@ impl ServerBuilder {
|
||||
|
||||
ServerBuilder {
|
||||
threads: num_cpus::get(),
|
||||
token: Token::default(),
|
||||
token: 0,
|
||||
handles: Vec::new(),
|
||||
services: Vec::new(),
|
||||
sockets: Vec::new(),
|
||||
@ -157,7 +156,7 @@ impl ServerBuilder {
|
||||
let sockets = bind_addr(addr, self.backlog)?;
|
||||
|
||||
for lst in sockets {
|
||||
let token = self.token.next();
|
||||
let token = self.next_token();
|
||||
self.services.push(StreamNewService::create(
|
||||
name.as_ref().to_string(),
|
||||
token,
|
||||
@ -206,7 +205,7 @@ impl ServerBuilder {
|
||||
{
|
||||
use std::net::{IpAddr, Ipv4Addr};
|
||||
lst.set_nonblocking(true)?;
|
||||
let token = self.token.next();
|
||||
let token = self.next_token();
|
||||
let addr = StdSocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
|
||||
self.services.push(StreamNewService::create(
|
||||
name.as_ref().to_string(),
|
||||
@ -232,7 +231,7 @@ impl ServerBuilder {
|
||||
lst.set_nonblocking(true)?;
|
||||
let addr = lst.local_addr()?;
|
||||
|
||||
let token = self.token.next();
|
||||
let token = self.next_token();
|
||||
self.services.push(StreamNewService::create(
|
||||
name.as_ref().to_string(),
|
||||
token,
|
||||
@ -291,12 +290,11 @@ impl ServerBuilder {
|
||||
fn start_worker(
|
||||
&self,
|
||||
idx: usize,
|
||||
waker: WakerQueue,
|
||||
waker_queue: WakerQueue,
|
||||
) -> (WorkerHandleAccept, WorkerHandleServer) {
|
||||
let avail = WorkerAvailability::new(idx, waker);
|
||||
let services = self.services.iter().map(|v| v.clone_factory()).collect();
|
||||
|
||||
ServerWorker::start(idx, services, avail, self.worker_config)
|
||||
ServerWorker::start(idx, services, waker_queue, self.worker_config)
|
||||
}
|
||||
|
||||
fn handle_cmd(&mut self, item: ServerCommand) {
|
||||
@ -410,6 +408,12 @@ impl ServerBuilder {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn next_token(&mut self) -> usize {
|
||||
let token = self.token;
|
||||
self.token += 1;
|
||||
token
|
||||
}
|
||||
}
|
||||
|
||||
impl Future for ServerBuilder {
|
||||
|
||||
@ -26,28 +26,6 @@ use std::future::Future;
|
||||
use std::pin::Pin;
|
||||
use std::task::{Context, Poll};
|
||||
|
||||
/// Socket ID token
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
|
||||
pub(crate) struct Token(usize);
|
||||
|
||||
impl Default for Token {
|
||||
fn default() -> Self {
|
||||
Self::new()
|
||||
}
|
||||
}
|
||||
|
||||
impl Token {
|
||||
fn new() -> Self {
|
||||
Self(0)
|
||||
}
|
||||
|
||||
pub(crate) fn next(&mut self) -> Token {
|
||||
let token = Token(self.0);
|
||||
self.0 += 1;
|
||||
token
|
||||
}
|
||||
}
|
||||
|
||||
/// Start server building process
|
||||
pub fn new() -> ServerBuilder {
|
||||
ServerBuilder::default()
|
||||
|
||||
@ -3,15 +3,12 @@ use std::net::SocketAddr;
|
||||
use std::task::{Context, Poll};
|
||||
|
||||
use actix_service::{Service, ServiceFactory as BaseServiceFactory};
|
||||
use actix_utils::{
|
||||
counter::CounterGuard,
|
||||
future::{ready, Ready},
|
||||
};
|
||||
use actix_utils::future::{ready, Ready};
|
||||
use futures_core::future::LocalBoxFuture;
|
||||
use log::error;
|
||||
|
||||
use crate::socket::{FromStream, MioStream};
|
||||
use crate::Token;
|
||||
use crate::worker::WorkerCounterGuard;
|
||||
|
||||
pub trait ServiceFactory<Stream: FromStream>: Send + Clone + 'static {
|
||||
type Factory: BaseServiceFactory<Stream, Config = ()>;
|
||||
@ -20,16 +17,16 @@ pub trait ServiceFactory<Stream: FromStream>: Send + Clone + 'static {
|
||||
}
|
||||
|
||||
pub(crate) trait InternalServiceFactory: Send {
|
||||
fn name(&self, token: Token) -> &str;
|
||||
fn name(&self, token: usize) -> &str;
|
||||
|
||||
fn clone_factory(&self) -> Box<dyn InternalServiceFactory>;
|
||||
|
||||
fn create(&self) -> LocalBoxFuture<'static, Result<(Token, BoxedServerService), ()>>;
|
||||
fn create(&self) -> LocalBoxFuture<'static, Result<(usize, BoxedServerService), ()>>;
|
||||
}
|
||||
|
||||
pub(crate) type BoxedServerService = Box<
|
||||
dyn Service<
|
||||
(CounterGuard, MioStream),
|
||||
(WorkerCounterGuard, MioStream),
|
||||
Response = (),
|
||||
Error = (),
|
||||
Future = Ready<Result<(), ()>>,
|
||||
@ -50,7 +47,7 @@ impl<S, I> StreamService<S, I> {
|
||||
}
|
||||
}
|
||||
|
||||
impl<S, I> Service<(CounterGuard, MioStream)> for StreamService<S, I>
|
||||
impl<S, I> Service<(WorkerCounterGuard, MioStream)> for StreamService<S, I>
|
||||
where
|
||||
S: Service<I>,
|
||||
S::Future: 'static,
|
||||
@ -65,7 +62,7 @@ where
|
||||
self.service.poll_ready(ctx).map_err(|_| ())
|
||||
}
|
||||
|
||||
fn call(&self, (guard, req): (CounterGuard, MioStream)) -> Self::Future {
|
||||
fn call(&self, (guard, req): (WorkerCounterGuard, MioStream)) -> Self::Future {
|
||||
ready(match FromStream::from_mio(req) {
|
||||
Ok(stream) => {
|
||||
let f = self.service.call(stream);
|
||||
@ -86,7 +83,7 @@ where
|
||||
pub(crate) struct StreamNewService<F: ServiceFactory<Io>, Io: FromStream> {
|
||||
name: String,
|
||||
inner: F,
|
||||
token: Token,
|
||||
token: usize,
|
||||
addr: SocketAddr,
|
||||
_t: PhantomData<Io>,
|
||||
}
|
||||
@ -98,7 +95,7 @@ where
|
||||
{
|
||||
pub(crate) fn create(
|
||||
name: String,
|
||||
token: Token,
|
||||
token: usize,
|
||||
inner: F,
|
||||
addr: SocketAddr,
|
||||
) -> Box<dyn InternalServiceFactory> {
|
||||
@ -117,7 +114,7 @@ where
|
||||
F: ServiceFactory<Io>,
|
||||
Io: FromStream + Send + 'static,
|
||||
{
|
||||
fn name(&self, _: Token) -> &str {
|
||||
fn name(&self, _: usize) -> &str {
|
||||
&self.name
|
||||
}
|
||||
|
||||
@ -131,7 +128,7 @@ where
|
||||
})
|
||||
}
|
||||
|
||||
fn create(&self) -> LocalBoxFuture<'static, Result<(Token, BoxedServerService), ()>> {
|
||||
fn create(&self) -> LocalBoxFuture<'static, Result<(usize, BoxedServerService), ()>> {
|
||||
let token = self.token;
|
||||
let fut = self.inner.create().new_service(());
|
||||
Box::pin(async move {
|
||||
|
||||
@ -2,8 +2,9 @@ use std::{
|
||||
future::Future,
|
||||
mem,
|
||||
pin::Pin,
|
||||
rc::Rc,
|
||||
sync::{
|
||||
atomic::{AtomicBool, Ordering},
|
||||
atomic::{AtomicUsize, Ordering},
|
||||
Arc,
|
||||
},
|
||||
task::{Context, Poll},
|
||||
@ -15,7 +16,6 @@ use actix_rt::{
|
||||
time::{sleep, Instant, Sleep},
|
||||
Arbiter,
|
||||
};
|
||||
use actix_utils::counter::Counter;
|
||||
use futures_core::{future::LocalBoxFuture, ready};
|
||||
use log::{error, info, trace};
|
||||
use tokio::sync::{
|
||||
@ -23,10 +23,10 @@ use tokio::sync::{
|
||||
oneshot,
|
||||
};
|
||||
|
||||
use crate::join_all;
|
||||
use crate::service::{BoxedServerService, InternalServiceFactory};
|
||||
use crate::socket::MioStream;
|
||||
use crate::waker_queue::{WakerInterest, WakerQueue};
|
||||
use crate::{join_all, Token};
|
||||
|
||||
/// Stop worker message. Returns `true` on successful graceful shutdown.
|
||||
/// and `false` if some connections still alive when shutdown execute.
|
||||
@ -38,35 +38,131 @@ pub(crate) struct Stop {
|
||||
#[derive(Debug)]
|
||||
pub(crate) struct Conn {
|
||||
pub io: MioStream,
|
||||
pub token: Token,
|
||||
pub token: usize,
|
||||
}
|
||||
|
||||
fn handle_pair(
|
||||
idx: usize,
|
||||
tx1: UnboundedSender<Conn>,
|
||||
tx2: UnboundedSender<Stop>,
|
||||
avail: WorkerAvailability,
|
||||
counter: Counter,
|
||||
) -> (WorkerHandleAccept, WorkerHandleServer) {
|
||||
let accept = WorkerHandleAccept { tx: tx1, avail };
|
||||
let accept = WorkerHandleAccept {
|
||||
idx,
|
||||
tx: tx1,
|
||||
counter,
|
||||
};
|
||||
|
||||
let server = WorkerHandleServer { idx, tx: tx2 };
|
||||
|
||||
(accept, server)
|
||||
}
|
||||
|
||||
/// counter: Arc<AtomicUsize> field is owned by `Accept` thread and `ServerWorker` thread.
|
||||
///
|
||||
/// `Accept` would increment the counter and `ServerWorker` would decrement it.
|
||||
///
|
||||
/// # Atomic Ordering:
|
||||
///
|
||||
/// `Accept` always look into it's cached `Availability` field for `ServerWorker` state.
|
||||
/// It lazily increment counter after successful dispatching new work to `ServerWorker`.
|
||||
/// On reaching counter limit `Accept` update it's cached `Availability` and mark worker as
|
||||
/// unable to accept any work.
|
||||
///
|
||||
/// `ServerWorker` always decrement the counter when every work received from `Accept` is done.
|
||||
/// On reaching counter limit worker would use `mio::Waker` and `WakerQueue` to wake up `Accept`
|
||||
/// and notify it to update cached `Availability` again to mark worker as able to accept work again.
|
||||
///
|
||||
/// Hense a wake up would only happen after `Accept` increment it to limit.
|
||||
/// And a decrement to limit always wake up `Accept`.
|
||||
#[derive(Clone)]
|
||||
pub(crate) struct Counter {
|
||||
counter: Arc<AtomicUsize>,
|
||||
limit: usize,
|
||||
}
|
||||
|
||||
impl Counter {
|
||||
pub(crate) fn new(limit: usize) -> Self {
|
||||
Self {
|
||||
counter: Arc::new(AtomicUsize::new(1)),
|
||||
limit,
|
||||
}
|
||||
}
|
||||
|
||||
/// Increment counter by 1 and return true when hitting limit
|
||||
#[inline(always)]
|
||||
pub(crate) fn inc(&self) -> bool {
|
||||
self.counter.fetch_add(1, Ordering::Relaxed) != self.limit
|
||||
}
|
||||
|
||||
/// Decrement counter by 1 and return true if crossing limit.
|
||||
#[inline(always)]
|
||||
pub(crate) fn dec(&self) -> bool {
|
||||
self.counter.fetch_sub(1, Ordering::Relaxed) == self.limit
|
||||
}
|
||||
|
||||
pub(crate) fn total(&self) -> usize {
|
||||
self.counter.load(Ordering::SeqCst) - 1
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) struct WorkerCounter {
|
||||
idx: usize,
|
||||
inner: Rc<(WakerQueue, Counter)>,
|
||||
}
|
||||
|
||||
impl Clone for WorkerCounter {
|
||||
fn clone(&self) -> Self {
|
||||
Self {
|
||||
idx: self.idx,
|
||||
inner: self.inner.clone(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl WorkerCounter {
|
||||
pub(crate) fn new(idx: usize, waker_queue: WakerQueue, counter: Counter) -> Self {
|
||||
Self {
|
||||
idx,
|
||||
inner: Rc::new((waker_queue, counter)),
|
||||
}
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
pub(crate) fn guard(&self) -> WorkerCounterGuard {
|
||||
WorkerCounterGuard(self.clone())
|
||||
}
|
||||
|
||||
fn total(&self) -> usize {
|
||||
self.inner.1.total()
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) struct WorkerCounterGuard(WorkerCounter);
|
||||
|
||||
impl Drop for WorkerCounterGuard {
|
||||
fn drop(&mut self) {
|
||||
let (waker_queue, counter) = &*self.0.inner;
|
||||
if counter.dec() {
|
||||
waker_queue.wake(WakerInterest::WorkerAvailable(self.0.idx));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Handle to worker that can send connection message to worker and share the
|
||||
/// availability of worker to other thread.
|
||||
///
|
||||
/// Held by [Accept](crate::accept::Accept).
|
||||
pub(crate) struct WorkerHandleAccept {
|
||||
idx: usize,
|
||||
tx: UnboundedSender<Conn>,
|
||||
avail: WorkerAvailability,
|
||||
counter: Counter,
|
||||
}
|
||||
|
||||
impl WorkerHandleAccept {
|
||||
#[inline(always)]
|
||||
pub(crate) fn idx(&self) -> usize {
|
||||
self.avail.idx
|
||||
self.idx
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
@ -75,8 +171,8 @@ impl WorkerHandleAccept {
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
pub(crate) fn available(&self) -> bool {
|
||||
self.avail.available()
|
||||
pub(crate) fn inc_counter(&self) -> bool {
|
||||
self.counter.inc()
|
||||
}
|
||||
}
|
||||
|
||||
@ -96,40 +192,6 @@ impl WorkerHandleServer {
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone)]
|
||||
pub(crate) struct WorkerAvailability {
|
||||
idx: usize,
|
||||
waker: WakerQueue,
|
||||
available: Arc<AtomicBool>,
|
||||
}
|
||||
|
||||
impl WorkerAvailability {
|
||||
pub fn new(idx: usize, waker: WakerQueue) -> Self {
|
||||
WorkerAvailability {
|
||||
idx,
|
||||
waker,
|
||||
available: Arc::new(AtomicBool::new(false)),
|
||||
}
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
pub fn available(&self) -> bool {
|
||||
self.available.load(Ordering::Acquire)
|
||||
}
|
||||
|
||||
pub fn set(&self, val: bool) {
|
||||
// Ordering:
|
||||
//
|
||||
// There could be multiple set calls happen in one <ServerWorker as Future>::poll.
|
||||
// Order is important between them.
|
||||
let old = self.available.swap(val, Ordering::AcqRel);
|
||||
// Notify the accept on switched to available.
|
||||
if !old && val {
|
||||
self.waker.wake(WakerInterest::WorkerAvailable(self.idx));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Service worker.
|
||||
///
|
||||
/// Worker accepts Socket objects via unbounded channel and starts stream processing.
|
||||
@ -138,9 +200,8 @@ pub(crate) struct ServerWorker {
|
||||
// It must be dropped as soon as ServerWorker dropping.
|
||||
rx: UnboundedReceiver<Conn>,
|
||||
rx2: UnboundedReceiver<Stop>,
|
||||
counter: WorkerCounter,
|
||||
services: Box<[WorkerService]>,
|
||||
availability: WorkerAvailability,
|
||||
conns: Counter,
|
||||
factories: Box<[Box<dyn InternalServiceFactory>]>,
|
||||
state: WorkerState,
|
||||
shutdown_timeout: Duration,
|
||||
@ -207,15 +268,15 @@ impl ServerWorker {
|
||||
pub(crate) fn start(
|
||||
idx: usize,
|
||||
factories: Vec<Box<dyn InternalServiceFactory>>,
|
||||
availability: WorkerAvailability,
|
||||
waker_queue: WakerQueue,
|
||||
config: ServerWorkerConfig,
|
||||
) -> (WorkerHandleAccept, WorkerHandleServer) {
|
||||
assert!(!availability.available());
|
||||
|
||||
let (tx1, rx) = unbounded_channel();
|
||||
let (tx2, rx2) = unbounded_channel();
|
||||
let avail = availability.clone();
|
||||
|
||||
let counter = Counter::new(config.max_concurrent_connections);
|
||||
|
||||
let counter_clone = counter.clone();
|
||||
// every worker runs in it's own arbiter.
|
||||
// use a custom tokio runtime builder to change the settings of runtime.
|
||||
Arbiter::with_tokio_rt(move || {
|
||||
@ -245,7 +306,7 @@ impl ServerWorker {
|
||||
Ok(res) => res
|
||||
.into_iter()
|
||||
.fold(Vec::new(), |mut services, (factory, token, service)| {
|
||||
assert_eq!(token.0, services.len());
|
||||
assert_eq!(token, services.len());
|
||||
services.push(WorkerService {
|
||||
factory,
|
||||
service,
|
||||
@ -266,8 +327,7 @@ impl ServerWorker {
|
||||
rx,
|
||||
rx2,
|
||||
services,
|
||||
availability,
|
||||
conns: Counter::new(config.max_concurrent_connections),
|
||||
counter: WorkerCounter::new(idx, waker_queue, counter_clone),
|
||||
factories: factories.into_boxed_slice(),
|
||||
state: Default::default(),
|
||||
shutdown_timeout: config.shutdown_timeout,
|
||||
@ -275,16 +335,16 @@ impl ServerWorker {
|
||||
});
|
||||
});
|
||||
|
||||
handle_pair(idx, tx1, tx2, avail)
|
||||
handle_pair(idx, tx1, tx2, counter)
|
||||
}
|
||||
|
||||
fn restart_service(&mut self, token: Token, factory_id: usize) {
|
||||
fn restart_service(&mut self, idx: usize, factory_id: usize) {
|
||||
let factory = &self.factories[factory_id];
|
||||
trace!("Service {:?} failed, restarting", factory.name(token));
|
||||
self.services[token.0].status = WorkerServiceStatus::Restarting;
|
||||
trace!("Service {:?} failed, restarting", factory.name(idx));
|
||||
self.services[idx].status = WorkerServiceStatus::Restarting;
|
||||
self.state = WorkerState::Restarting(Restart {
|
||||
factory_id,
|
||||
token,
|
||||
token: idx,
|
||||
fut: factory.create(),
|
||||
});
|
||||
}
|
||||
@ -302,8 +362,8 @@ impl ServerWorker {
|
||||
});
|
||||
}
|
||||
|
||||
fn check_readiness(&mut self, cx: &mut Context<'_>) -> Result<bool, (Token, usize)> {
|
||||
let mut ready = self.conns.available(cx);
|
||||
fn check_readiness(&mut self, cx: &mut Context<'_>) -> Result<bool, (usize, usize)> {
|
||||
let mut ready = true;
|
||||
for (idx, srv) in self.services.iter_mut().enumerate() {
|
||||
if srv.status == WorkerServiceStatus::Available
|
||||
|| srv.status == WorkerServiceStatus::Unavailable
|
||||
@ -313,7 +373,7 @@ impl ServerWorker {
|
||||
if srv.status == WorkerServiceStatus::Unavailable {
|
||||
trace!(
|
||||
"Service {:?} is available",
|
||||
self.factories[srv.factory].name(Token(idx))
|
||||
self.factories[srv.factory].name(idx)
|
||||
);
|
||||
srv.status = WorkerServiceStatus::Available;
|
||||
}
|
||||
@ -324,7 +384,7 @@ impl ServerWorker {
|
||||
if srv.status == WorkerServiceStatus::Available {
|
||||
trace!(
|
||||
"Service {:?} is unavailable",
|
||||
self.factories[srv.factory].name(Token(idx))
|
||||
self.factories[srv.factory].name(idx)
|
||||
);
|
||||
srv.status = WorkerServiceStatus::Unavailable;
|
||||
}
|
||||
@ -332,10 +392,10 @@ impl ServerWorker {
|
||||
Poll::Ready(Err(_)) => {
|
||||
error!(
|
||||
"Service {:?} readiness check returned error, restarting",
|
||||
self.factories[srv.factory].name(Token(idx))
|
||||
self.factories[srv.factory].name(idx)
|
||||
);
|
||||
srv.status = WorkerServiceStatus::Failed;
|
||||
return Err((Token(idx), srv.factory));
|
||||
return Err((idx, srv.factory));
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -354,8 +414,8 @@ enum WorkerState {
|
||||
|
||||
struct Restart {
|
||||
factory_id: usize,
|
||||
token: Token,
|
||||
fut: LocalBoxFuture<'static, Result<(Token, BoxedServerService), ()>>,
|
||||
token: usize,
|
||||
fut: LocalBoxFuture<'static, Result<(usize, BoxedServerService), ()>>,
|
||||
}
|
||||
|
||||
// Shutdown keep states necessary for server shutdown:
|
||||
@ -376,10 +436,6 @@ impl Default for WorkerState {
|
||||
|
||||
impl Drop for ServerWorker {
|
||||
fn drop(&mut self) {
|
||||
// Set availability to true so if accept try to send connection to this worker
|
||||
// it would find worker is gone and remove it.
|
||||
// This is helpful when worker is dropped unexpected.
|
||||
self.availability.set(true);
|
||||
// Stop the Arbiter ServerWorker runs on on drop.
|
||||
Arbiter::current().stop();
|
||||
}
|
||||
@ -394,8 +450,7 @@ impl Future for ServerWorker {
|
||||
// `StopWorker` message handler
|
||||
if let Poll::Ready(Some(Stop { graceful, tx })) = Pin::new(&mut this.rx2).poll_recv(cx)
|
||||
{
|
||||
this.availability.set(false);
|
||||
let num = this.conns.total();
|
||||
let num = this.counter.total();
|
||||
if num == 0 {
|
||||
info!("Shutting down worker, 0 connections");
|
||||
let _ = tx.send(true);
|
||||
@ -422,7 +477,6 @@ impl Future for ServerWorker {
|
||||
WorkerState::Unavailable => match this.check_readiness(cx) {
|
||||
Ok(true) => {
|
||||
this.state = WorkerState::Available;
|
||||
this.availability.set(true);
|
||||
self.poll(cx)
|
||||
}
|
||||
Ok(false) => Poll::Pending,
|
||||
@ -450,7 +504,7 @@ impl Future for ServerWorker {
|
||||
this.factories[factory_id].name(token)
|
||||
);
|
||||
|
||||
this.services[token.0].created(service);
|
||||
this.services[token].created(service);
|
||||
this.state = WorkerState::Unavailable;
|
||||
|
||||
self.poll(cx)
|
||||
@ -459,7 +513,7 @@ impl Future for ServerWorker {
|
||||
// Wait for 1 second.
|
||||
ready!(shutdown.timer.as_mut().poll(cx));
|
||||
|
||||
if this.conns.total() == 0 {
|
||||
if this.counter.total() == 0 {
|
||||
// Graceful shutdown.
|
||||
if let WorkerState::Shutdown(shutdown) = mem::take(&mut this.state) {
|
||||
let _ = shutdown.tx.send(true);
|
||||
@ -484,22 +538,20 @@ impl Future for ServerWorker {
|
||||
Ok(true) => {}
|
||||
Ok(false) => {
|
||||
trace!("Worker is unavailable");
|
||||
this.availability.set(false);
|
||||
this.state = WorkerState::Unavailable;
|
||||
return self.poll(cx);
|
||||
}
|
||||
Err((token, idx)) => {
|
||||
this.restart_service(token, idx);
|
||||
this.availability.set(false);
|
||||
return self.poll(cx);
|
||||
}
|
||||
}
|
||||
|
||||
match ready!(Pin::new(&mut this.rx).poll_recv(cx)) {
|
||||
// handle incoming io stream
|
||||
match ready!(Pin::new(&mut this.rx).poll_recv(cx)) {
|
||||
Some(msg) => {
|
||||
let guard = this.conns.get();
|
||||
let _ = this.services[msg.token.0].service.call((guard, msg.io));
|
||||
let guard = this.counter.guard();
|
||||
let _ = this.services[msg.token].service.call((guard, msg.io));
|
||||
}
|
||||
None => return Poll::Ready(()),
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user