client connector wait timeout

src/client/connector.rs

@@ -1,11 +1,11 @@
 use std::{fmt, mem, io, time};
-use std::cell::RefCell;
+use std::cell::{Cell, RefCell};
 use std::rc::Rc;
 use std::net::Shutdown;
 use std::time::{Duration, Instant};
 use std::collections::{HashMap, VecDeque};
 
-use actix::{fut, Actor, ActorFuture, Context, AsyncContext,
+use actix::{fut, Actor, ActorFuture, Arbiter, Context, AsyncContext,
             Handler, Message, ActorResponse, Supervised, ContextFutureSpawner};
 use actix::registry::ArbiterService;
 use actix::fut::WrapFuture;
@@ -16,6 +16,7 @@ use futures::{Async, Future, Poll};
 use futures::task::{Task, current as current_task};
 use futures::unsync::oneshot;
 use tokio_io::{AsyncRead, AsyncWrite};
+use tokio_core::reactor::Timeout;
 
 #[cfg(feature="alpn")]
 use openssl::ssl::{SslMethod, SslConnector, Error as OpensslError};
@@ -35,8 +36,9 @@ use server::IoStream;
 /// `Connect` type represents message that can be send to `ClientConnector`
 /// with connection request.
 pub struct Connect {
-    pub uri: Uri,
-    pub conn_timeout: Duration,
+    pub(crate) uri: Uri,
+    pub(crate) wait_time: Duration,
+    pub(crate) conn_timeout: Duration,
 }
 
 impl Connect {
@@ -44,9 +46,25 @@ impl Connect {
     pub fn new<U>(uri: U) -> Result<Connect, HttpError> where Uri: HttpTryFrom<U> {
         Ok(Connect {
             uri: Uri::try_from(uri).map_err(|e| e.into())?,
-            conn_timeout: Duration::from_secs(1)
+            wait_time: Duration::from_secs(5),
+            conn_timeout: Duration::from_secs(1),
         })
     }
+
+    /// Connection timeout, max time to connect to remote host.
+    /// By default connect timeout is 1 seccond.
+    pub fn conn_timeout(mut self, timeout: Duration) -> Self {
+        self.conn_timeout = timeout;
+        self
+    }
+
+    /// If connection pool limits are enabled, wait time indicates
+    /// max time to wait for available connection.
+    /// By default connect timeout is 5 secconds.
+    pub fn wait_time(mut self, timeout: Duration) -> Self {
+        self.wait_time = timeout;
+        self
+    }
 }
 
 impl Message for Connect {
@@ -102,6 +120,7 @@ impl From<ConnectorError> for ClientConnectorError {
 
 struct Waiter {
     tx: oneshot::Sender<Result<Connection, ClientConnectorError>>,
+    wait: Instant,
     conn_timeout: Duration,
 }
 
@@ -114,6 +133,8 @@ pub struct ClientConnector {
     connector: TlsConnector,
 
     pool: Rc<Pool>,
+    pool_modified: Rc<Cell<bool>>,
+
     conn_lifetime: Duration,
     conn_keep_alive: Duration,
     limit: usize,
@@ -123,6 +144,7 @@ pub struct ClientConnector {
     available: HashMap<Key, VecDeque<Conn>>,
     to_close: Vec<Connection>,
     waiters: HashMap<Key, VecDeque<Waiter>>,
+    wait_timeout: Option<(Instant, Timeout)>,
 }
 
 impl Actor for ClientConnector {
@@ -140,6 +162,8 @@ impl ArbiterService for ClientConnector {}
 
 impl Default for ClientConnector {
     fn default() -> ClientConnector {
+        let modified = Rc::new(Cell::new(false));
+
         #[cfg(all(feature="alpn"))]
         {
             let builder = SslConnector::builder(SslMethod::tls()).unwrap();
@@ -149,7 +173,8 @@ impl Default for ClientConnector {
         {
             let builder = TlsConnector::builder().unwrap();
             ClientConnector {
-                pool: Rc::new(Pool::new()),
+                pool: Rc::new(Pool::new(Rc::clone(&modified))),
+                pool_modified: modified,
                 connector: builder.build().unwrap(),
                 conn_lifetime: Duration::from_secs(15),
                 conn_keep_alive: Duration::from_secs(75),
@@ -160,11 +185,13 @@ impl Default for ClientConnector {
                 available: HashMap::new(),
                 to_close: Vec::new(),
                 waiters: HashMap::new(),
+                wait_timeout: None,
             }
         }
 
         #[cfg(not(any(feature="alpn", feature="tls")))]
-        ClientConnector {pool: Rc::new(Pool::new()),
+        ClientConnector {pool: Rc::new(Pool::new(Rc::clone(&modified))),
+                         pool_modified: modified,
                          conn_lifetime: Duration::from_secs(15),
                          conn_keep_alive: Duration::from_secs(75),
                          limit: 100,
@@ -174,6 +201,7 @@ impl Default for ClientConnector {
                          available: HashMap::new(),
                          to_close: Vec::new(),
                          waiters: HashMap::new(),
+                         wait_timeout: None,
         }
     }
 }
@@ -224,9 +252,11 @@ impl ClientConnector {
     /// }
     /// ```
     pub fn with_connector(connector: SslConnector) -> ClientConnector {
+        let modified = Rc::new(Cell::new(false));
         ClientConnector {
             connector,
-            pool: Rc::new(Pool::new()),
+            pool: Rc::new(Pool::new(Rc::clone(&modified))),
+            pool_modified: modified,
             conn_lifetime: Duration::from_secs(15),
             conn_keep_alive: Duration::from_secs(75),
             limit: 100,
@@ -236,6 +266,7 @@ impl ClientConnector {
             available: HashMap::new(),
             to_close: Vec::new(),
             waiters: HashMap::new(),
+            wait_timeout: None,
         }
     }
 
@@ -357,31 +388,33 @@ impl ClientConnector {
     fn collect(&mut self, periodic: bool) {
         let now = Instant::now();
 
-        // collect half acquire keys
-        if let Some(keys) = self.pool.collect_keys() {
-            for key in keys {
-                self.release_key(&key);
+        if self.pool_modified.get() {
+            // collect half acquire keys
+            if let Some(keys) = self.pool.collect_keys() {
+                for key in keys {
+                    self.release_key(&key);
+                }
             }
-        }
 
-        // collect connections for close
-        if let Some(to_close) = self.pool.collect_close() {
-            for conn in to_close {
-                self.release_key(&conn.key);
-                self.to_close.push(conn);
+            // collect connections for close
+            if let Some(to_close) = self.pool.collect_close() {
+                for conn in to_close {
+                    self.release_key(&conn.key);
+                    self.to_close.push(conn);
+                }
             }
-        }
 
-        // connection connections
-        if let Some(to_release) = self.pool.collect_release() {
-            for conn in to_release {
-                self.release_key(&conn.key);
+            // connection connections
+            if let Some(to_release) = self.pool.collect_release() {
+                for conn in to_release {
+                    self.release_key(&conn.key);
 
-                // check connection lifetime and the return to available pool
-                if (now - conn.ts) < self.conn_lifetime {
-                    self.available.entry(conn.key.clone())
-                        .or_insert_with(VecDeque::new)
-                        .push_back(Conn(Instant::now(), conn));
+                    // check connection lifetime and the return to available pool
+                    if (now - conn.ts) < self.conn_lifetime {
+                        self.available.entry(conn.key.clone())
+                            .or_insert_with(VecDeque::new)
+                            .push_back(Conn(Instant::now(), conn));
+                    }
                 }
             }
         }
@@ -412,6 +445,8 @@ impl ClientConnector {
                 }
             }
         }
+
+        self.pool_modified.set(false);
     }
 
     fn collect_periodic(&mut self, ctx: &mut Context<Self>) {
@@ -419,15 +454,58 @@ impl ClientConnector {
         // re-schedule next collect period
         ctx.run_later(Duration::from_secs(1), |act, ctx| act.collect_periodic(ctx));
     }
+
+    fn collect_waiters(&mut self) {
+        let now = Instant::now();
+        let mut next = None;
+
+        for (_, waiters) in &mut self.waiters {
+            let mut idx = 0;
+            while idx < waiters.len() {
+                if waiters[idx].wait <= now {
+                    let waiter = waiters.swap_remove_back(idx).unwrap();
+                    let _ = waiter.tx.send(Err(ClientConnectorError::Timeout));
+                } else {
+                    if let Some(n) = next {
+                        if waiters[idx].wait < n {
+                            next = Some(waiters[idx].wait);
+                        }
+                    } else {
+                        next = Some(waiters[idx].wait);
+                    }
+                    idx += 1;
+                }
+            }
+        }
+
+        if next.is_some() {
+            self.install_wait_timeout(next.unwrap());
+        }
+    }
+    
+    fn install_wait_timeout(&mut self, time: Instant) {
+        if let Some(ref mut wait) = self.wait_timeout {
+            if wait.0 < time {
+                return
+            }
+        }
+
+        let mut timeout = Timeout::new(time-Instant::now(), Arbiter::handle()).unwrap();
+        let _ = timeout.poll();
+        self.wait_timeout = Some((time, timeout));
+    }
 }
 
 impl Handler<Connect> for ClientConnector {
     type Result = ActorResponse<ClientConnector, Connection, ClientConnectorError>;
 
     fn handle(&mut self, msg: Connect, _: &mut Self::Context) -> Self::Result {
-        self.collect(false);
+        if self.pool_modified.get() {
+            self.collect(false);
+        }
 
         let uri = &msg.uri;
+        let wait_time = msg.wait_time;
         let conn_timeout = msg.conn_timeout;
 
         // host name is required
@@ -469,7 +547,11 @@ impl Handler<Connect> for ClientConnector {
                 Acquire::NotAvailable => {
                     // connection is not available, wait
                     let (tx, rx) = oneshot::channel();
-                    let waiter = Waiter{ tx, conn_timeout };
+
+                    let wait = Instant::now() + wait_time;
+                    self.install_wait_timeout(wait);
+
+                    let waiter = Waiter{ tx, wait, conn_timeout };
                     self.waiters.entry(key.clone()).or_insert_with(VecDeque::new)
                         .push_back(waiter);
                     return ActorResponse::async(
@@ -563,8 +645,13 @@ impl fut::ActorFuture for Maintenance
     fn poll(&mut self, act: &mut ClientConnector, ctx: &mut Context<ClientConnector>)
             -> Poll<Self::Item, Self::Error>
     {
-        // collecto connections
-        act.collect(false);
+        // collect connections
+        if act.pool_modified.get() {
+            act.collect(false);
+        }
+
+        // collect wait timers
+        act.collect_waiters();
 
         // check waiters
         let tmp: &mut ClientConnector = unsafe{mem::transmute(act as &mut _)};
@@ -781,11 +868,13 @@ pub struct Pool {
     to_close: RefCell<Vec<Connection>>,
     to_release: RefCell<Vec<Connection>>,
     task: RefCell<Option<Task>>,
+    modified: Rc<Cell<bool>>,
 }
 
 impl Pool {
-    fn new() -> Pool {
+    fn new(modified: Rc<Cell<bool>>) -> Pool {
         Pool {
+            modified,
             keys: RefCell::new(Vec::new()),
             to_close: RefCell::new(Vec::new()),
             to_release: RefCell::new(Vec::new()),
@@ -818,6 +907,7 @@ impl Pool {
     }
 
     fn close(&self, conn: Connection) {
+        self.modified.set(true);
         self.to_close.borrow_mut().push(conn);
         if let Some(ref task) = *self.task.borrow() {
             task.notify()
@@ -825,6 +915,7 @@ impl Pool {
     }
 
     fn release(&self, conn: Connection) {
+        self.modified.set(true);
         self.to_release.borrow_mut().push(conn);
         if let Some(ref task) = *self.task.borrow() {
             task.notify()
@@ -832,6 +923,7 @@ impl Pool {
     }
 
     fn release_key(&self, key: Key) {
+        self.modified.set(true);
         self.keys.borrow_mut().push(key);
         if let Some(ref task) = *self.task.borrow() {
             task.notify()

src/client/pipeline.rs

@@ -69,6 +69,7 @@ pub struct SendRequest {
     state: State,
     conn: Addr<Unsync, ClientConnector>,
     conn_timeout: Duration,
+    wait_time: Duration,
     timeout: Option<Timeout>,
 }
 
@@ -83,7 +84,8 @@ impl SendRequest {
         SendRequest{req, conn,
                     state: State::New,
                     timeout: None,
-                    conn_timeout: Duration::from_secs(1)
+                    wait_time: Duration::from_secs(5),
+                    conn_timeout: Duration::from_secs(1),
         }
     }
 
@@ -93,6 +95,7 @@ impl SendRequest {
                     state: State::Connection(conn),
                     conn: ClientConnector::from_registry(),
                     timeout: None,
+                    wait_time: Duration::from_secs(5),
                     conn_timeout: Duration::from_secs(1),
         }
     }
@@ -115,6 +118,15 @@ impl SendRequest {
         self.conn_timeout = timeout;
         self
     }
+
+    /// Set wait time
+    ///
+    /// If connections pool limits are enabled, wait time indicates max time
+    /// to wait for available connection. Default value is 5 seconds.
+    pub fn wait_time(mut self, timeout: Duration) -> Self {
+        self.wait_time = timeout;
+        self
+    }
 }
 
 impl Future for SendRequest {
@@ -129,6 +141,7 @@ impl Future for SendRequest {
                 State::New =>
                     self.state = State::Connect(self.conn.send(Connect {
                         uri: self.req.uri().clone(),
+                        wait_time: self.wait_time,
                         conn_timeout: self.conn_timeout,
                     })),
                 State::Connect(mut conn) => match conn.poll() {