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refactor keep-alive; update guide

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This commit is contained in:
Nikolay Kim 2017-12-13 21:38:47 -08:00
parent 653b431895
commit c2751efa87
9 changed files with 161 additions and 95 deletions
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2
build.rs
View file

@ -15,10 +15,10 @@ fn main() {
"guide/src/qs_1.md",
"guide/src/qs_2.md",
"guide/src/qs_3.md",
"guide/src/qs_3_5.md",
"guide/src/qs_4.md",
"guide/src/qs_4_5.md",
"guide/src/qs_5.md",
"guide/src/qs_6.md",
"guide/src/qs_7.md",
"guide/src/qs_9.md",
"guide/src/qs_10.md",

2
guide/src/SUMMARY.md
View file

@ -3,9 +3,9 @@
[Quickstart](./qs_1.md)
- [Getting Started](./qs_2.md)
- [Application](./qs_3.md)
- [Server](./qs_3_5.md)
- [Handler](./qs_4.md)
- [Errors](./qs_4_5.md)
- [State](./qs_6.md)
- [URL Dispatch](./qs_5.md)
- [Request & Response](./qs_7.md)
- [WebSockets](./qs_9.md)

43
guide/src/qs_3.md
View file

@ -56,3 +56,46 @@ fn main() {
```
All `/app1` requests route to first application, `/app2` to second and then all other to third.
## State
Application state is shared with all routes and resources within same application.
State could be accessed with `HttpRequest::state()` method as a read-only item
but interior mutability pattern with `RefCell` could be used to archive state mutability.
State could be accessed with `HttpContext::state()` in case of http actor.
State also available to route matching predicates and middlewares.
Let's write simple application that uses shared state. We are going to store requests count
in the state:
```rust
# extern crate actix;
# extern crate actix_web;
#
use actix_web::*;
use std::cell::Cell;
// This struct represents state
struct AppState {
counter: Cell<usize>,
}
fn index(req: HttpRequest<AppState>) -> String {
let count = req.state().counter.get() + 1; // <- get count
req.state().counter.set(count); // <- store new count in state
format!("Request number: {}", count) // <- response with count
}
fn main() {
Application::with_state(AppState{counter: Cell::new(0)})
.resource("/", |r| r.method(Method::GET).f(index))
.finish();
}
```
Note on application state, http server accepts application factory rather than application
instance. Http server construct application instance for each thread, so application state
must be constructed multiple times. If you want to share state between different thread
shared object should be used, like `Arc`. Application state does not need to be `Send` and `Sync`
but application factory must be `Send` + `Sync`.

37
guide/src/qs_6.md
View file

@ -1,37 +0,0 @@
# Application state
Application state is shared with all routes and resources within same application.
State could be accessed with `HttpRequest::state()` method as a read-only item
but interior mutability pattern with `RefCell` could be used to archive state mutability.
State could be accessed with `HttpContext::state()` in case of http actor.
State also available to route matching predicates. State is not available
to application middlewares, middlewares receives `HttpRequest<()>` object.
Let's write simple application that uses shared state. We are going to store requests count
in the state:
```rust
# extern crate actix;
# extern crate actix_web;
#
use actix_web::*;
use std::cell::Cell;
// This struct represents state
struct AppState {
counter: Cell<usize>,
}
fn index(req: HttpRequest<AppState>) -> String {
let count = req.state().counter.get() + 1; // <- get count
req.state().counter.set(count); // <- store new count in state
format!("Request number: {}", count) // <- response with count
}
fn main() {
Application::with_state(AppState{counter: Cell::new(0)})
.resource("/", |r| r.method(Method::GET).f(index))
.finish();
}
```

5
src/channel.rs
View file

@ -11,7 +11,7 @@ use h2;
use error::Error;
use h1writer::Writer;
use httprequest::HttpRequest;
use server::ServerSettings;
use server::{ServerSettings, WorkerSettings};
/// Low level http request handler
#[allow(unused_variables)]
@ -67,7 +67,8 @@ pub struct HttpChannel<T, H>
impl<T, H> HttpChannel<T, H>
where T: AsyncRead + AsyncWrite + 'static, H: HttpHandler + 'static
{
pub fn new(h: Rc<Vec<H>>, io: T, peer: Option<SocketAddr>, http2: bool) -> HttpChannel<T, H>
pub(crate) fn new(h: Rc<WorkerSettings<H>>,
io: T, peer: Option<SocketAddr>, http2: bool) -> HttpChannel<T, H>
{
if http2 {
HttpChannel {

41
src/h1.rs
View file

@ -17,12 +17,12 @@ use pipeline::Pipeline;
use encoding::PayloadType;
use channel::{HttpHandler, HttpHandlerTask};
use h1writer::H1Writer;
use server::WorkerSettings;
use httpcodes::HTTPNotFound;
use httprequest::HttpRequest;
use error::{ParseError, PayloadError, ResponseError};
use payload::{Payload, PayloadWriter, DEFAULT_BUFFER_SIZE};
const KEEPALIVE_PERIOD: u64 = 15; // seconds
const INIT_BUFFER_SIZE: usize = 8192;
const MAX_BUFFER_SIZE: usize = 131_072;
const MAX_HEADERS: usize = 100;
@ -59,7 +59,7 @@ enum Item {
pub(crate) struct Http1<T: AsyncWrite + 'static, H: 'static> {
flags: Flags,
handlers: Rc<Vec<H>>,
settings: Rc<WorkerSettings<H>>,
addr: Option<SocketAddr>,
stream: H1Writer<T>,
reader: Reader,
@ -77,9 +77,9 @@ impl<T, H> Http1<T, H>
where T: AsyncRead + AsyncWrite + 'static,
H: HttpHandler + 'static
{
pub fn new(h: Rc<Vec<H>>, stream: T, addr: Option<SocketAddr>) -> Self {
pub fn new(h: Rc<WorkerSettings<H>>, stream: T, addr: Option<SocketAddr>) -> Self {
Http1{ flags: Flags::KEEPALIVE,
handlers: h,
settings: h,
addr: addr,
stream: H1Writer::new(stream),
reader: Reader::new(),
@ -88,8 +88,8 @@ impl<T, H> Http1<T, H>
keepalive_timer: None }
}
pub fn into_inner(self) -> (Rc<Vec<H>>, T, Option<SocketAddr>, Bytes) {
(self.handlers, self.stream.into_inner(), self.addr, self.read_buf.freeze())
pub fn into_inner(self) -> (Rc<WorkerSettings<H>>, T, Option<SocketAddr>, Bytes) {
(self.settings, self.stream.into_inner(), self.addr, self.read_buf.freeze())
}
pub fn poll(&mut self) -> Poll<Http1Result, ()> {
@ -198,7 +198,7 @@ impl<T, H> Http1<T, H>
// start request processing
let mut pipe = None;
for h in self.handlers.iter() {
for h in self.settings.handlers().iter() {
req = match h.handle(req) {
Ok(t) => {
pipe = Some(t);
@ -249,19 +249,24 @@ impl<T, H> Http1<T, H>
Ok(Async::NotReady) => {
// start keep-alive timer, this is also slow request timeout
if self.tasks.is_empty() {
if self.flags.contains(Flags::KEEPALIVE) {
if self.keepalive_timer.is_none() {
trace!("Start keep-alive timer");
let mut to = Timeout::new(
Duration::new(KEEPALIVE_PERIOD, 0),
Arbiter::handle()).unwrap();
// register timeout
let _ = to.poll();
self.keepalive_timer = Some(to);
if let Some(keep_alive) = self.settings.keep_alive() {
if keep_alive > 0 && self.flags.contains(Flags::KEEPALIVE) {
if self.keepalive_timer.is_none() {
trace!("Start keep-alive timer");
let mut to = Timeout::new(
Duration::new(keep_alive as u64, 0),
Arbiter::handle()).unwrap();
// register timeout
let _ = to.poll();
self.keepalive_timer = Some(to);
}
} else {
// keep-alive disable, drop connection
return Ok(Async::Ready(Http1Result::Done))
}
} else {
// keep-alive disable, drop connection
return Ok(Async::Ready(Http1Result::Done))
// keep-alive unset, rely on operating system
return Ok(Async::NotReady)
}
}
break

43
src/h2.rs
View file

@ -16,6 +16,7 @@ use tokio_core::reactor::Timeout;
use pipeline::Pipeline;
use h2writer::H2Writer;
use server::WorkerSettings;
use channel::{HttpHandler, HttpHandlerTask};
use error::PayloadError;
use encoding::PayloadType;
@ -23,8 +24,6 @@ use httpcodes::HTTPNotFound;
use httprequest::HttpRequest;
use payload::{Payload, PayloadWriter};
const KEEPALIVE_PERIOD: u64 = 15; // seconds
bitflags! {
struct Flags: u8 {
const DISCONNECTED = 0b0000_0010;
@ -36,7 +35,7 @@ pub(crate) struct Http2<T, H>
where T: AsyncRead + AsyncWrite + 'static, H: 'static
{
flags: Flags,
handlers: Rc<Vec<H>>,
settings: Rc<WorkerSettings<H>>,
addr: Option<SocketAddr>,
state: State<IoWrapper<T>>,
tasks: VecDeque<Entry>,
@ -53,14 +52,14 @@ impl<T, H> Http2<T, H>
where T: AsyncRead + AsyncWrite + 'static,
H: HttpHandler + 'static
{
pub fn new(h: Rc<Vec<H>>, stream: T, addr: Option<SocketAddr>, buf: Bytes) -> Self
pub fn new(h: Rc<WorkerSettings<H>>, io: T, addr: Option<SocketAddr>, buf: Bytes) -> Self
{
Http2{ flags: Flags::empty(),
handlers: h,
settings: h,
addr: addr,
tasks: VecDeque::new(),
state: State::Handshake(
Server::handshake(IoWrapper{unread: Some(buf), inner: stream})),
Server::handshake(IoWrapper{unread: Some(buf), inner: io})),
keepalive_timer: None,
}
}
@ -151,18 +150,28 @@ impl<T, H> Http2<T, H>
self.keepalive_timer.take();
self.tasks.push_back(
Entry::new(parts, body, resp, self.addr, &self.handlers));
Entry::new(parts, body, resp, self.addr, &self.settings));
}
Ok(Async::NotReady) => {
// start keep-alive timer
if self.tasks.is_empty() && self.keepalive_timer.is_none() {
trace!("Start keep-alive timer");
let mut timeout = Timeout::new(
Duration::new(KEEPALIVE_PERIOD, 0),
Arbiter::handle()).unwrap();
// register timeout
let _ = timeout.poll();
self.keepalive_timer = Some(timeout);
if self.tasks.is_empty() {
if let Some(keep_alive) = self.settings.keep_alive() {
if keep_alive > 0 && self.keepalive_timer.is_none() {
trace!("Start keep-alive timer");
let mut timeout = Timeout::new(
Duration::new(keep_alive as u64, 0),
Arbiter::handle()).unwrap();
// register timeout
let _ = timeout.poll();
self.keepalive_timer = Some(timeout);
}
} else {
// keep-alive disable, drop connection
return Ok(Async::Ready(()))
}
} else {
// keep-alive unset, rely on operating system
return Ok(Async::NotReady)
}
}
Err(err) => {
@ -230,7 +239,7 @@ impl Entry {
recv: RecvStream,
resp: Respond<Bytes>,
addr: Option<SocketAddr>,
handlers: &Rc<Vec<H>>) -> Entry
settings: &Rc<WorkerSettings<H>>) -> Entry
where H: HttpHandler + 'static
{
// Payload and Content-Encoding
@ -247,7 +256,7 @@ impl Entry {
// start request processing
let mut task = None;
for h in handlers.iter() {
for h in settings.handlers().iter() {
req = match h.handle(req) {
Ok(t) => {
task = Some(t);

1
src/lib.rs
View file

@ -110,6 +110,7 @@ pub mod headers {
//! Headers implementation
pub use encoding::ContentEncoding;
pub use httpresponse::ConnectionType;
pub use cookie::Cookie;
pub use cookie::CookieBuilder;

82
src/server.rs
View file

@ -90,10 +90,11 @@ impl ServerSettings {
pub struct HttpServer<T, A, H, U>
where H: 'static
{
h: Rc<Vec<H>>,
h: Option<Rc<WorkerSettings<H>>>,
io: PhantomData<T>,
addr: PhantomData<A>,
threads: usize,
keep_alive: Option<u16>,
factory: Arc<Fn() -> U + Send + Sync>,
workers: Vec<SyncAddress<Worker<H>>>,
}
@ -124,10 +125,11 @@ impl<T, A, H, U, V> HttpServer<T, A, H, U>
pub fn new<F>(factory: F) -> Self
where F: Sync + Send + 'static + Fn() -> U,
{
HttpServer{ h: Rc::new(Vec::new()),
HttpServer{ h: None,
io: PhantomData,
addr: PhantomData,
threads: num_cpus::get(),
keep_alive: None,
factory: Arc::new(factory),
workers: Vec::new(),
}
@ -141,6 +143,20 @@ impl<T, A, H, U, V> HttpServer<T, A, H, U>
self
}
/// Set server keep-alive setting.
///
/// By default keep alive is enabled.
///
/// - `Some(75)` - enable
///
/// - `Some(0)` - disable
///
/// - `None` - use `SO_KEEPALIVE` socket option
pub fn keep_alive(mut self, val: Option<u16>) -> Self {
self.keep_alive = val;
self
}
/// Start listening for incomming connections from a stream.
///
/// This method uses only one thread for handling incoming connections.
@ -155,7 +171,7 @@ impl<T, A, H, U, V> HttpServer<T, A, H, U>
for app in &mut apps {
app.server_settings(settings.clone());
}
self.h = Rc::new(apps);
self.h = Some(Rc::new(WorkerSettings{h: apps, keep_alive: self.keep_alive}));
// start server
Ok(HttpServer::create(move |ctx| {
@ -215,15 +231,16 @@ impl<T, A, H, U, V> HttpServer<T, A, H, U>
}
fn start_workers(&mut self, settings: &ServerSettings, handler: &StreamHandlerType)
-> Vec<mpsc::UnboundedSender<IoStream<net::TcpStream>>>
-> Vec<mpsc::UnboundedSender<IoStream<Socket>>>
{
// start workers
let mut workers = Vec::new();
for _ in 0..self.threads {
let s = settings.clone();
let (tx, rx) = mpsc::unbounded::<IoStream<net::TcpStream>>();
let (tx, rx) = mpsc::unbounded::<IoStream<Socket>>();
let h = handler.clone();
let ka = self.keep_alive.clone();
let factory = Arc::clone(&self.factory);
let addr = Arbiter::start(move |ctx: &mut Context<_>| {
let mut apps: Vec<_> = (*factory)()
@ -232,7 +249,7 @@ impl<T, A, H, U, V> HttpServer<T, A, H, U>
app.server_settings(s.clone());
}
ctx.add_stream(rx);
Worker{h: Rc::new(apps), handler: h}
Worker::new(apps, h, ka)
});
workers.push(tx);
self.workers.push(addr);
@ -379,7 +396,7 @@ impl<T, A, H, U> Handler<IoStream<T>, io::Error> for HttpServer<T, A, H, U>
-> Response<Self, IoStream<T>>
{
Arbiter::handle().spawn(
HttpChannel::new(Rc::clone(&self.h), msg.io, msg.peer, msg.http2));
HttpChannel::new(Rc::clone(&self.h.as_ref().unwrap()), msg.io, msg.peer, msg.http2));
Self::empty()
}
}
@ -389,11 +406,33 @@ impl<T, A, H, U> Handler<IoStream<T>, io::Error> for HttpServer<T, A, H, U>
///
/// Worker accepts Socket objects via unbounded channel and start requests processing.
struct Worker<H> {
h: Rc<Vec<H>>,
h: Rc<WorkerSettings<H>>,
handler: StreamHandlerType,
}
pub(crate) struct WorkerSettings<H> {
h: Vec<H>,
keep_alive: Option<u16>,
}
impl<H> WorkerSettings<H> {
pub fn handlers(&self) -> &Vec<H> {
&self.h
}
pub fn keep_alive(&self) -> Option<u16> {
self.keep_alive
}
}
impl<H: 'static> Worker<H> {
fn new(h: Vec<H>, handler: StreamHandlerType, keep_alive: Option<u16>) -> Worker<H> {
Worker {
h: Rc::new(WorkerSettings{h: h, keep_alive: keep_alive}),
handler: handler,
}
}
fn update_time(&self, ctx: &mut Context<Self>) {
utils::update_date();
ctx.run_later(Duration::new(1, 0), |slf, ctx| slf.update_time(ctx));
@ -408,15 +447,20 @@ impl<H: 'static> Actor for Worker<H> {
}
}
impl<H> StreamHandler<IoStream<net::TcpStream>> for Worker<H>
impl<H> StreamHandler<IoStream<Socket>> for Worker<H>
where H: HttpHandler + 'static {}
impl<H> Handler<IoStream<net::TcpStream>> for Worker<H>
impl<H> Handler<IoStream<Socket>> for Worker<H>
where H: HttpHandler + 'static,
{
fn handle(&mut self, msg: IoStream<net::TcpStream>, _: &mut Context<Self>)
-> Response<Self, IoStream<net::TcpStream>>
fn handle(&mut self, msg: IoStream<Socket>, _: &mut Context<Self>)
-> Response<Self, IoStream<Socket>>
{
if let None = self.h.keep_alive {
if msg.io.set_keepalive(Some(Duration::new(75, 0))).is_err() {
error!("Can not set socket keep-alive option");
}
}
self.handler.handle(Rc::clone(&self.h), msg);
Self::empty()
}
@ -432,10 +476,11 @@ enum StreamHandlerType {
}
impl StreamHandlerType {
fn handle<H: HttpHandler>(&mut self, h: Rc<Vec<H>>, msg: IoStream<net::TcpStream>) {
fn handle<H: HttpHandler>(&mut self, h: Rc<WorkerSettings<H>>, msg: IoStream<Socket>) {
match *self {
StreamHandlerType::Normal => {
let io = TcpStream::from_stream(msg.io, Arbiter::handle())
let io = TcpStream::from_stream(msg.io.into_tcp_stream(), Arbiter::handle())
.expect("failed to associate TCP stream");
Arbiter::handle().spawn(HttpChannel::new(h, io, msg.peer, msg.http2));
@ -443,7 +488,7 @@ impl StreamHandlerType {
#[cfg(feature="tls")]
StreamHandlerType::Tls(ref acceptor) => {
let IoStream { io, peer, http2 } = msg;
let io = TcpStream::from_stream(io, Arbiter::handle())
let io = TcpStream::from_stream(io.into_tcp_stream(), Arbiter::handle())
.expect("failed to associate TCP stream");
Arbiter::handle().spawn(
@ -461,7 +506,7 @@ impl StreamHandlerType {
#[cfg(feature="alpn")]
StreamHandlerType::Alpn(ref acceptor) => {
let IoStream { io, peer, .. } = msg;
let io = TcpStream::from_stream(io, Arbiter::handle())
let io = TcpStream::from_stream(io.into_tcp_stream(), Arbiter::handle())
.expect("failed to associate TCP stream");
Arbiter::handle().spawn(
@ -488,7 +533,7 @@ impl StreamHandlerType {
}
fn start_accept_thread(sock: Socket, addr: net::SocketAddr,
workers: Vec<mpsc::UnboundedSender<IoStream<net::TcpStream>>>) {
workers: Vec<mpsc::UnboundedSender<IoStream<Socket>>>) {
// start acceptors thread
let _ = thread::Builder::new().name(format!("Accept on {}", addr)).spawn(move || {
let mut next = 0;
@ -500,8 +545,7 @@ fn start_accept_thread(sock: Socket, addr: net::SocketAddr,
} else {
net::SocketAddr::V6(addr.as_inet6().unwrap())
};
let msg = IoStream{
io: socket.into_tcp_stream(), peer: Some(addr), http2: false};
let msg = IoStream{io: socket, peer: Some(addr), http2: false};
workers[next].unbounded_send(msg).expect("worker thread died");
next = (next + 1) % workers.len();
}