Improve HTTP server docs (#470)

src/lib.rs

@@ -251,7 +251,8 @@ pub mod dev {
     pub use context::Drain;
     pub use extractor::{FormConfig, PayloadConfig};
     pub use handler::{AsyncResult, Handler};
-    pub use httpmessage::{MessageBody, UrlEncoded};
+    pub use httpmessage::{MessageBody, Readlines, UrlEncoded};
+    pub use pipeline::Pipeline;
     pub use httpresponse::HttpResponseBuilder;
     pub use info::ConnectionInfo;
     pub use json::{JsonBody, JsonConfig};

src/pipeline.rs

@@ -83,7 +83,7 @@ impl<S: 'static> PipelineInfo<S> {
 }
 
 impl<S: 'static, H: PipelineHandler<S>> Pipeline<S, H> {
-    pub fn new(
+    pub(crate) fn new(
         req: HttpRequest<S>, mws: Rc<Vec<Box<Middleware<S>>>>, handler: Rc<H>,
     ) -> Pipeline<S, H> {
         let mut info = PipelineInfo {
@@ -475,7 +475,7 @@ impl<S: 'static, H> ProcessResponse<S, H> {
                                 }
                             }
                         }
-                        Ok(Async::Ready(None)) => 
+                        Ok(Async::Ready(None)) =>
                             return Some(FinishingMiddlewares::init(
                                 info, mws, self.resp.take().unwrap(),
                             )),

src/server/http.rs

@@ -31,6 +31,10 @@ use super::{
 };
 
 /// An HTTP Server
+///
+/// By default it serves HTTP2 when HTTPs is enabled,
+/// in order to change it, use `ServerFlags` that can be provided
+/// to acceptor service.
 pub struct HttpServer<H>
 where
     H: IntoHttpHandler + 'static,

src/server/mod.rs

@@ -1,4 +1,111 @@
-//! Http server
+//! Http server module
+//!
+//! The module contains everything necessary to setup
+//! HTTP server.
+//!
+//! In order to start HTTP server, first you need to create and configure it
+//! using factory that can be supplied to [new](fn.new.html).
+//!
+//! ## Factory
+//!
+//! Factory is a function that returns Application, describing how
+//! to serve incoming HTTP requests.
+//!
+//! As the server uses worker pool, the factory function is restricted to trait bounds
+//! `Sync + Send + 'static` so that each worker would be able to accept Application
+//! without a need for synchronization.
+//!
+//! If you wish to share part of state among all workers you should
+//! wrap it in `Arc` and potentially synchronization primitive like
+//! [RwLock](https://doc.rust-lang.org/std/sync/struct.RwLock.html)
+//! If the wrapped type is not thread safe.
+//!
+//! Note though that locking is not advisable for asynchronous programming
+//! and you should minimize all locks in your request handlers
+//!
+//! ## HTTPS Support
+//!
+//! Actix-web provides support for major crates that provides TLS.
+//! Each TLS implementation is provided with [AcceptorService](trait.AcceptorService.html)
+//! that describes how HTTP Server accepts connections.
+//!
+//! For `bind` and `listen` there are corresponding `bind_with` and `listen_with` that accepts
+//! these services.
+//!
+//! By default, acceptor would work with both HTTP2 and HTTP1 protocols.
+//! But it can be controlled using [ServerFlags](struct.ServerFlags.html) which
+//! can be supplied when creating `AcceptorService`.
+//!
+//! **NOTE:** `native-tls` doesn't support `HTTP2` yet
+//!
+//! ## Signal handling and shutdown
+//!
+//! By default HTTP Server listens for system signals
+//! and, gracefully shuts down at most after 30 seconds.
+//!
+//! Both signal handling and shutdown timeout can be controlled
+//! using corresponding methods.
+//!
+//! If worker, for some reason, unable to shut down within timeout
+//! it is forcibly dropped.
+//!
+//! ## Example
+//!
+//! ```rust,ignore
+//!extern crate actix;
+//!extern crate actix_web;
+//!extern crate rustls;
+//!
+//!use actix_web::{http, middleware, server, App, Error, HttpRequest, HttpResponse, Responder};
+//!use std::io::BufReader;
+//!use rustls::internal::pemfile::{certs, rsa_private_keys};
+//!use rustls::{NoClientAuth, ServerConfig};
+//!
+//!fn index(req: &HttpRequest) -> Result<HttpResponse, Error> {
+//!    Ok(HttpResponse::Ok().content_type("text/plain").body("Welcome!"))
+//!}
+//!
+//!fn load_ssl() -> ServerConfig {
+//!    use std::io::BufReader;
+//!
+//!    const CERT: &'static [u8] = include_bytes!("../cert.pem");
+//!    const KEY: &'static [u8] = include_bytes!("../key.pem");
+//!
+//!    let mut cert = BufReader::new(CERT);
+//!    let mut key = BufReader::new(KEY);
+//!
+//!    let mut config = ServerConfig::new(NoClientAuth::new());
+//!    let cert_chain = certs(&mut cert).unwrap();
+//!    let mut keys = rsa_private_keys(&mut key).unwrap();
+//!    config.set_single_cert(cert_chain, keys.remove(0)).unwrap();
+//!
+//!    config
+//!}
+//!
+//!fn main() {
+//!    let sys = actix::System::new("http-server");
+//!    // load ssl keys
+//!    let config = load_ssl();
+//!
+//!     // Create acceptor service for only HTTP1 protocol
+//!     // You can use ::new(config) to leave defaults
+//!     let acceptor = server::RustlsAcceptor::with_flags(config, actix_web::server::ServerFlags::HTTP1);
+//!
+//!     // create and start server at once
+//!     server::new(|| {
+//!         App::new()
+//!             // register simple handler, handle all methods
+//!             .resource("/index.html", |r| r.f(index))
+//!             }))
+//!     }).bind_with("127.0.0.1:8080", acceptor)
+//!     .unwrap()
+//!     .start();
+//!
+//!     println!("Started http server: 127.0.0.1:8080");
+//!     //Run system so that server would start accepting connections
+//!     let _ = sys.run();
+//!}
+//! ```
 use std::net::Shutdown;
 use std::rc::Rc;
 use std::{io, net, time};
@@ -83,8 +190,11 @@ where
 }
 
 bitflags! {
+    ///Flags that can be used to configure HTTP Server.
     pub struct ServerFlags: u8 {
+        ///Use HTTP1 protocol
         const HTTP1 = 0b0000_0001;
+        ///Use HTTP2 protocol
         const HTTP2 = 0b0000_0010;
     }
 }

src/server/server.rs

@@ -13,6 +13,8 @@ use super::accept::{AcceptLoop, AcceptNotify, Command};
 use super::worker::{StopWorker, Worker, WorkerClient, Conn};
 use super::{PauseServer, ResumeServer, StopServer, Token};
 
+///Describes service that could be used
+///with [Server](struct.Server.html)
 pub trait Service: Send + 'static {
     /// Clone service
     fn clone(&self) -> Box<Service>;
@@ -31,6 +33,8 @@ impl Service for Box<Service> {
     }
 }
 
+///Describes the way serivce handles incoming
+///TCP connections.
 pub trait ServiceHandler {
     /// Handle incoming stream
     fn handle(&mut self, token: Token, io: net::TcpStream, peer: Option<net::SocketAddr>);
@@ -43,6 +47,7 @@ pub(crate) enum ServerCommand {
     WorkerDied(usize),
 }
 
+///Server
 pub struct Server {
     threads: usize,
     workers: Vec<(usize, Addr<Worker>)>,
@@ -80,7 +85,7 @@ impl Server {
             maxconnrate: 256,
         }
     }
-    
+
     /// Set number of workers to start.
     ///
     /// By default http server uses number of available logical cpu as threads
@@ -108,7 +113,7 @@ impl Server {
     ///
     /// By default max connections is set to a 256.
     pub fn maxconnrate(mut self, num: usize) -> Self {
-        self.maxconnrate= num;
+        self.maxconnrate = num;
         self
     }
 
@@ -146,7 +151,7 @@ impl Server {
     }
 
     /// Add new service to server
-    pub fn service<T>(mut self, srv: T) -> Self 
+    pub fn service<T>(mut self, srv: T) -> Self
     where
         T: Into<(Box<Service>, Vec<(Token, net::TcpListener)>)>
     {
@@ -171,7 +176,7 @@ impl Server {
     ///
     /// fn main() {
     ///     Server::new().
-    ///         .service( 
+    ///         .service(
     ///            HttpServer::new(|| App::new().resource("/", |r| r.h(|_| HttpResponse::Ok())))
     ///                .bind("127.0.0.1:0")
     ///                .expect("Can not bind to 127.0.0.1:0"))
@@ -184,7 +189,7 @@ impl Server {
         sys.run();
     }
 
-    /// Start
+    /// Starts Server Actor and returns its address
     pub fn start(mut self) -> Addr<Server> {
         if self.sockets.is_empty() {
             panic!("Service should have at least one bound socket");
@@ -393,7 +398,8 @@ impl StreamHandler<ServerCommand, ()> for Server {
 }
 
 #[derive(Clone, Default)]
-pub struct Connections (Arc<ConnectionsInner>);
+///Contains information about connection.
+pub struct Connections(Arc<ConnectionsInner>);
 
 impl Connections {
     fn new(notify: AcceptNotify, maxconn: usize, maxconnrate: usize) -> Self {
@@ -458,7 +464,7 @@ impl ConnectionsInner {
             self.notify.notify();
         }
     }
-    
+
     fn notify_maxconnrate(&self, connrate: usize) {
         if connrate > self.maxconnrate_low && connrate <= self.maxconnrate {
             self.notify.notify();
@@ -468,8 +474,8 @@ impl ConnectionsInner {
 }
 
 /// Type responsible for max connection stat.
-/// 
+///
-/// Max connections stat get updated on drop. 
+/// Max connections stat get updated on drop.
 pub struct ConnectionTag(Arc<ConnectionsInner>);
 
 impl ConnectionTag {
@@ -487,8 +493,8 @@ impl Drop for ConnectionTag {
 }
 
 /// Type responsible for max connection rate stat.
-/// 
+///
-/// Max connections rate stat get updated on drop. 
+/// Max connections rate stat get updated on drop.
 pub struct ConnectionRateTag (Arc<ConnectionsInner>);
 
 impl ConnectionRateTag {