2dc6202fe7
This introduces the `hyper::service` module, which replaces `tokio-service`. Since the trait is specific to hyper, its associated types have been adjusted. It didn't make sense to need to define `Service<Request=http::Request>`, since we already know the context is HTTP. Instead, the request and response bodies are associated types now, and slightly stricter bounds have been placed on `Error`. The helpers `service_fn` and `service_fn_ok` should be sufficient for now to ease creating `Service`s. The `NewService` trait now allows service creation to also be asynchronous. These traits are similar to `tower` in nature, and possibly will be replaced completely by it in the future. For now, hyper defining its own allows the traits to have better context, and prevents breaking changes in `tower` from affecting hyper. Closes #1461 BREAKING CHANGE: The `Service` trait has changed: it has some changed associated types, and `call` is now bound to `&mut self`. The `NewService` trait has changed: it has some changed associated types, and `new_service` now returns a `Future`. `Client` no longer implements `Service` for now. `hyper::server::conn::Serve` now returns `Connecting` instead of `Connection`s, since `new_service` can now return a `Future`. The `Connecting` is a future wrapping the new service future, returning a `Connection` afterwards. In many cases, `Future::flatten` can be used.
662 lines
21 KiB
Rust
662 lines
21 KiB
Rust
//! HTTP Client
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use std::fmt;
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use std::io;
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use std::sync::Arc;
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use std::time::Duration;
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use futures::{Async, Future, Poll};
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use futures::future::{self, Either, Executor};
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use futures::sync::oneshot;
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use http::{Method, Request, Response, Uri, Version};
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use http::header::{Entry, HeaderValue, HOST};
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use http::uri::Scheme;
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use body::{Body, Payload};
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use common::Exec;
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use self::pool::{Pool, Poolable, Reservation};
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pub use self::connect::{Connect, HttpConnector};
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use self::connect::Destination;
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pub mod conn;
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pub mod connect;
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pub(crate) mod dispatch;
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mod dns;
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mod pool;
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#[cfg(test)]
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mod tests;
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/// A Client to make outgoing HTTP requests.
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pub struct Client<C, B = Body> {
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connector: Arc<C>,
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executor: Exec,
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h1_writev: bool,
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pool: Pool<PoolClient<B>>,
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retry_canceled_requests: bool,
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set_host: bool,
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ver: Ver,
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}
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impl Client<HttpConnector, Body> {
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/// Create a new Client with the default config.
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#[inline]
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pub fn new() -> Client<HttpConnector, Body> {
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Builder::default().build_http()
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}
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}
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impl Default for Client<HttpConnector, Body> {
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fn default() -> Client<HttpConnector, Body> {
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Client::new()
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}
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}
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impl Client<HttpConnector, Body> {
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/// Configure a Client.
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///
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/// # Example
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///
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/// ```
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/// use hyper::Client;
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///
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/// let client = Client::builder()
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/// .keep_alive(true)
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/// .build_http();
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/// # let infer: Client<_, hyper::Body> = client;
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/// # drop(infer);
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/// ```
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#[inline]
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pub fn builder() -> Builder {
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Builder::default()
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}
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}
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impl<C, B> Client<C, B>
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where C: Connect + Sync + 'static,
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C::Transport: 'static,
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C::Future: 'static,
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B: Payload + Send + 'static,
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B::Data: Send,
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{
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/// Send a `GET` request to the supplied `Uri`.
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///
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/// # Note
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///
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/// This requires that the `Payload` type have a `Default` implementation.
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/// It *should* return an "empty" version of itself, such that
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/// `Payload::is_end_stream` is `true`.
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pub fn get(&self, uri: Uri) -> FutureResponse
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where
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B: Default,
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{
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let body = B::default();
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if !body.is_end_stream() {
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warn!("default Payload used for get() does not return true for is_end_stream");
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}
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let mut req = Request::new(body);
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*req.uri_mut() = uri;
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self.request(req)
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}
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/// Send a constructed Request using this Client.
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pub fn request(&self, mut req: Request<B>) -> FutureResponse {
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// TODO(0.12): do this at construction time.
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//
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// It cannot be done in the constructor because the Client::configured
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// does not have `B: 'static` bounds, which are required to spawn
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// the interval. In 0.12, add a static bounds to the constructor,
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// and move this.
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self.schedule_pool_timer();
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match req.version() {
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Version::HTTP_10 |
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Version::HTTP_11 => (),
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other => {
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error!("Request has unsupported version \"{:?}\"", other);
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//TODO: replace this with a proper variant
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return FutureResponse(Box::new(future::err(::Error::new_user_unsupported_version())));
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}
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}
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if req.method() == &Method::CONNECT {
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debug!("Client does not support CONNECT requests");
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return FutureResponse(Box::new(future::err(::Error::new_user_unsupported_request_method())));
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}
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let uri = req.uri().clone();
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let domain = match (uri.scheme_part(), uri.authority_part()) {
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(Some(scheme), Some(auth)) => {
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format!("{}://{}", scheme, auth)
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}
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_ => {
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//TODO: replace this with a proper variant
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return FutureResponse(Box::new(future::err(::Error::new_io(
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io::Error::new(
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io::ErrorKind::InvalidInput,
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"invalid URI for Client Request"
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)
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))));
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}
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};
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if self.set_host && self.ver == Ver::Http1 {
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if let Entry::Vacant(entry) = req.headers_mut().entry(HOST).expect("HOST is always valid header name") {
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let hostname = uri.host().expect("authority implies host");
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let host = if let Some(port) = uri.port() {
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let s = format!("{}:{}", hostname, port);
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HeaderValue::from_str(&s)
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} else {
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HeaderValue::from_str(hostname)
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}.expect("uri host is valid header value");
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entry.insert(host);
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}
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}
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let client = self.clone();
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let uri = req.uri().clone();
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let fut = RetryableSendRequest {
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client: client,
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future: self.send_request(req, &domain),
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domain: domain,
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uri: uri,
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};
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FutureResponse(Box::new(fut))
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}
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//TODO: replace with `impl Future` when stable
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fn send_request(&self, mut req: Request<B>, domain: &str) -> Box<Future<Item=Response<Body>, Error=ClientError<B>> + Send> {
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let url = req.uri().clone();
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let ver = self.ver;
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let pool_key = (Arc::new(domain.to_string()), self.ver);
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let checkout = self.pool.checkout(pool_key.clone());
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let connect = {
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let executor = self.executor.clone();
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let pool = self.pool.clone();
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let h1_writev = self.h1_writev;
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let connector = self.connector.clone();
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let dst = Destination {
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uri: url,
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};
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future::lazy(move || {
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if let Some(connecting) = pool.connecting(&pool_key) {
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Either::A(connector.connect(dst)
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.map_err(::Error::new_connect)
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.and_then(move |(io, connected)| {
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conn::Builder::new()
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.h1_writev(h1_writev)
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.http2_only(pool_key.1 == Ver::Http2)
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.handshake_no_upgrades(io)
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.and_then(move |(tx, conn)| {
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executor.execute(conn.map_err(|e| {
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debug!("client connection error: {}", e)
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}));
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// Wait for 'conn' to ready up before we
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// declare this tx as usable
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tx.when_ready()
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})
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.map(move |tx| {
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pool.pooled(connecting, PoolClient {
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is_proxied: connected.is_proxied,
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tx: match ver {
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Ver::Http1 => PoolTx::Http1(tx),
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Ver::Http2 => PoolTx::Http2(tx.into_http2()),
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},
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})
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})
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}))
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} else {
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let canceled = ::Error::new_canceled(Some("HTTP/2 connection in progress"));
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Either::B(future::err(canceled))
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}
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})
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};
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let race = checkout.select(connect)
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.map(|(pooled, _work)| pooled)
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.or_else(|(e, other)| {
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// Either checkout or connect could get canceled:
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//
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// 1. Connect is canceled if this is HTTP/2 and there is
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// an outstanding HTTP/2 connecting task.
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// 2. Checkout is canceled if the pool cannot deliver an
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// idle connection reliably.
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//
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// In both cases, we should just wait for the other future.
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if e.is_canceled() {
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//trace!("checkout/connect race canceled: {}", e);
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Either::A(other.map_err(ClientError::Normal))
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} else {
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Either::B(future::err(ClientError::Normal(e)))
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}
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});
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let executor = self.executor.clone();
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let resp = race.and_then(move |mut pooled| {
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let conn_reused = pooled.is_reused();
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if ver == Ver::Http1 {
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set_relative_uri(req.uri_mut(), pooled.is_proxied);
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}
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let fut = pooled.send_request_retryable(req)
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.map_err(move |(err, orig_req)| {
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if let Some(req) = orig_req {
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ClientError::Canceled {
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connection_reused: conn_reused,
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reason: err,
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req,
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}
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} else {
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ClientError::Normal(err)
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}
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})
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.and_then(move |mut res| {
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// when pooled is dropped, it will try to insert back into the
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// pool. To delay that, spawn a future that completes once the
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// sender is ready again.
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//
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// This *should* only be once the related `Connection` has polled
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// for a new request to start.
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//
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// It won't be ready if there is a body to stream.
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if pooled.is_ready() {
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drop(pooled);
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} else if !res.body().is_empty() {
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let (delayed_tx, delayed_rx) = oneshot::channel();
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res.body_mut().delayed_eof(delayed_rx);
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executor.execute(
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future::poll_fn(move || {
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pooled.poll_ready()
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})
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.then(move |_| {
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// At this point, `pooled` is dropped, and had a chance
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// to insert into the pool (if conn was idle)
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drop(delayed_tx);
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Ok(())
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})
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);
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}
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Ok(res)
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});
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fut
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});
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Box::new(resp)
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}
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fn schedule_pool_timer(&self) {
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self.pool.spawn_expired_interval(&self.executor);
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}
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}
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impl<C, B> Clone for Client<C, B> {
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fn clone(&self) -> Client<C, B> {
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Client {
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connector: self.connector.clone(),
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executor: self.executor.clone(),
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h1_writev: self.h1_writev,
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pool: self.pool.clone(),
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retry_canceled_requests: self.retry_canceled_requests,
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set_host: self.set_host,
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ver: self.ver,
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}
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}
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}
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impl<C, B> fmt::Debug for Client<C, B> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("Client")
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.finish()
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}
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}
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/// A `Future` that will resolve to an HTTP Response.
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#[must_use = "futures do nothing unless polled"]
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pub struct FutureResponse(Box<Future<Item=Response<Body>, Error=::Error> + Send + 'static>);
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impl fmt::Debug for FutureResponse {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.pad("Future<Response>")
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}
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}
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impl Future for FutureResponse {
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type Item = Response<Body>;
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type Error = ::Error;
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fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
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self.0.poll()
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}
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}
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struct RetryableSendRequest<C, B> {
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client: Client<C, B>,
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domain: String,
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future: Box<Future<Item=Response<Body>, Error=ClientError<B>> + Send>,
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uri: Uri,
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}
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impl<C, B> Future for RetryableSendRequest<C, B>
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where
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C: Connect + 'static,
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C::Future: 'static,
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B: Payload + Send + 'static,
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B::Data: Send,
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{
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type Item = Response<Body>;
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type Error = ::Error;
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fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
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loop {
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match self.future.poll() {
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Ok(Async::Ready(resp)) => return Ok(Async::Ready(resp)),
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Ok(Async::NotReady) => return Ok(Async::NotReady),
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Err(ClientError::Normal(err)) => return Err(err),
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Err(ClientError::Canceled {
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connection_reused,
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mut req,
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reason,
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}) => {
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if !self.client.retry_canceled_requests || !connection_reused {
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// if client disabled, don't retry
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// a fresh connection means we definitely can't retry
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return Err(reason);
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}
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trace!("unstarted request canceled, trying again (reason={:?})", reason);
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*req.uri_mut() = self.uri.clone();
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self.future = self.client.send_request(req, &self.domain);
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}
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}
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}
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}
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}
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struct PoolClient<B> {
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is_proxied: bool,
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tx: PoolTx<B>,
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}
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enum PoolTx<B> {
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Http1(conn::SendRequest<B>),
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Http2(conn::Http2SendRequest<B>),
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}
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impl<B> PoolClient<B> {
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fn poll_ready(&mut self) -> Poll<(), ::Error> {
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match self.tx {
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PoolTx::Http1(ref mut tx) => tx.poll_ready(),
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PoolTx::Http2(_) => Ok(Async::Ready(())),
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}
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}
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fn is_ready(&self) -> bool {
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match self.tx {
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PoolTx::Http1(ref tx) => tx.is_ready(),
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PoolTx::Http2(ref tx) => tx.is_ready(),
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}
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}
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}
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impl<B: Payload + 'static> PoolClient<B> {
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//TODO: replace with `impl Future` when stable
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fn send_request_retryable(&mut self, req: Request<B>) -> Box<Future<Item=Response<Body>, Error=(::Error, Option<Request<B>>)> + Send>
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where
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B: Send,
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{
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match self.tx {
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PoolTx::Http1(ref mut tx) => tx.send_request_retryable(req),
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PoolTx::Http2(ref mut tx) => tx.send_request_retryable(req),
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}
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}
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}
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impl<B> Poolable for PoolClient<B>
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where
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B: 'static,
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{
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fn is_closed(&self) -> bool {
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match self.tx {
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PoolTx::Http1(ref tx) => tx.is_closed(),
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PoolTx::Http2(ref tx) => tx.is_closed(),
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}
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}
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fn reserve(self) -> Reservation<Self> {
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match self.tx {
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PoolTx::Http1(tx) => {
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Reservation::Unique(PoolClient {
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is_proxied: self.is_proxied,
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tx: PoolTx::Http1(tx),
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})
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},
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PoolTx::Http2(tx) => {
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let b = PoolClient {
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is_proxied: self.is_proxied,
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tx: PoolTx::Http2(tx.clone()),
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};
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let a = PoolClient {
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is_proxied: self.is_proxied,
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tx: PoolTx::Http2(tx),
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};
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Reservation::Shared(a, b)
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}
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}
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}
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}
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enum ClientError<B> {
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Normal(::Error),
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Canceled {
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connection_reused: bool,
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req: Request<B>,
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reason: ::Error,
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}
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}
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/// A marker to identify what version a pooled connection is.
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#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
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enum Ver {
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Http1,
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Http2,
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}
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fn set_relative_uri(uri: &mut Uri, is_proxied: bool) {
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if is_proxied && uri.scheme_part() != Some(&Scheme::HTTPS) {
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return;
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}
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let path = match uri.path_and_query() {
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Some(path) if path.as_str() != "/" => {
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let mut parts = ::http::uri::Parts::default();
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parts.path_and_query = Some(path.clone());
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Uri::from_parts(parts).expect("path is valid uri")
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},
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_none_or_just_slash => {
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"/".parse().expect("/ is valid path")
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}
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};
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*uri = path;
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}
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|
|
/// Builder for a Client
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#[derive(Clone)]
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pub struct Builder {
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//connect_timeout: Duration,
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exec: Exec,
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keep_alive: bool,
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keep_alive_timeout: Option<Duration>,
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h1_writev: bool,
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//TODO: make use of max_idle config
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max_idle: usize,
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retry_canceled_requests: bool,
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set_host: bool,
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ver: Ver,
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}
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|
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impl Default for Builder {
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fn default() -> Self {
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Self {
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exec: Exec::Default,
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keep_alive: true,
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keep_alive_timeout: Some(Duration::from_secs(90)),
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h1_writev: true,
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max_idle: 5,
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retry_canceled_requests: true,
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set_host: true,
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ver: Ver::Http1,
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}
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}
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}
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|
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impl Builder {
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/// Enable or disable keep-alive mechanics.
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///
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/// Default is enabled.
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#[inline]
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pub fn keep_alive(&mut self, val: bool) -> &mut Self {
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|
self.keep_alive = val;
|
|
self
|
|
}
|
|
|
|
/// Set an optional timeout for idle sockets being kept-alive.
|
|
///
|
|
/// Pass `None` to disable timeout.
|
|
///
|
|
/// Default is 90 seconds.
|
|
#[inline]
|
|
pub fn keep_alive_timeout(&mut self, val: Option<Duration>) -> &mut Self {
|
|
self.keep_alive_timeout = val;
|
|
self
|
|
}
|
|
|
|
/// Set whether HTTP/1 connections should try to use vectored writes,
|
|
/// or always flatten into a single buffer.
|
|
///
|
|
/// Note that setting this to false may mean more copies of body data,
|
|
/// but may also improve performance when an IO transport doesn't
|
|
/// support vectored writes well, such as most TLS implementations.
|
|
///
|
|
/// Default is `true`.
|
|
#[inline]
|
|
pub fn http1_writev(&mut self, val: bool) -> &mut Self {
|
|
self.h1_writev = val;
|
|
self
|
|
}
|
|
|
|
/// Set whether the connection **must** use HTTP/2.
|
|
///
|
|
/// Note that setting this to true prevents HTTP/1 from being allowed.
|
|
///
|
|
/// Default is false.
|
|
pub fn http2_only(&mut self, val: bool) -> &mut Self {
|
|
self.ver = if val {
|
|
Ver::Http2
|
|
} else {
|
|
Ver::Http1
|
|
};
|
|
self
|
|
}
|
|
|
|
/// Set whether to retry requests that get disrupted before ever starting
|
|
/// to write.
|
|
///
|
|
/// This means a request that is queued, and gets given an idle, reused
|
|
/// connection, and then encounters an error immediately as the idle
|
|
/// connection was found to be unusable.
|
|
///
|
|
/// When this is set to `false`, the related `FutureResponse` would instead
|
|
/// resolve to an `Error::Cancel`.
|
|
///
|
|
/// Default is `true`.
|
|
#[inline]
|
|
pub fn retry_canceled_requests(&mut self, val: bool) -> &mut Self {
|
|
self.retry_canceled_requests = val;
|
|
self
|
|
}
|
|
|
|
/// Set whether to automatically add the `Host` header to requests.
|
|
///
|
|
/// If true, and a request does not include a `Host` header, one will be
|
|
/// added automatically, derived from the authority of the `Uri`.
|
|
///
|
|
/// Default is `true`.
|
|
#[inline]
|
|
pub fn set_host(&mut self, val: bool) -> &mut Self {
|
|
self.set_host = val;
|
|
self
|
|
}
|
|
|
|
/// Provide an executor to execute background `Connection` tasks.
|
|
pub fn executor<E>(&mut self, exec: E) -> &mut Self
|
|
where
|
|
E: Executor<Box<Future<Item=(), Error=()> + Send>> + Send + Sync + 'static,
|
|
{
|
|
self.exec = Exec::Executor(Arc::new(exec));
|
|
self
|
|
}
|
|
|
|
/// Builder a client with this configuration and the default `HttpConnector`.
|
|
pub fn build_http<B>(&self) -> Client<HttpConnector, B>
|
|
where
|
|
B: Payload + Send,
|
|
B::Data: Send,
|
|
{
|
|
let mut connector = HttpConnector::new(4);
|
|
if self.keep_alive {
|
|
connector.set_keepalive(self.keep_alive_timeout);
|
|
}
|
|
self.build(connector)
|
|
}
|
|
|
|
/// Combine the configuration of this builder with a connector to create a `Client`.
|
|
pub fn build<C, B>(&self, connector: C) -> Client<C, B>
|
|
where
|
|
C: Connect,
|
|
C::Transport: 'static,
|
|
C::Future: 'static,
|
|
B: Payload + Send,
|
|
B::Data: Send,
|
|
{
|
|
Client {
|
|
connector: Arc::new(connector),
|
|
executor: self.exec.clone(),
|
|
h1_writev: self.h1_writev,
|
|
pool: Pool::new(self.keep_alive, self.keep_alive_timeout),
|
|
retry_canceled_requests: self.retry_canceled_requests,
|
|
set_host: self.set_host,
|
|
ver: self.ver,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for Builder {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
f.debug_struct("Builder")
|
|
.field("keep_alive", &self.keep_alive)
|
|
.field("keep_alive_timeout", &self.keep_alive_timeout)
|
|
.field("http1_writev", &self.h1_writev)
|
|
.field("max_idle", &self.max_idle)
|
|
.field("set_host", &self.set_host)
|
|
.field("version", &self.ver)
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod unit_tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn set_relative_uri_with_implicit_path() {
|
|
let mut uri = "http://hyper.rs".parse().unwrap();
|
|
set_relative_uri(&mut uri, false);
|
|
|
|
assert_eq!(uri.to_string(), "/");
|
|
}
|
|
}
|