Close streams with Reset instead of Close when closing streaming connections

This ensures that the call to close the underlying streaming connection will execute immediately,
instead of waiting for all streams to gracefully shut down.
This commit is contained in:
Andy Goldstein 2016-03-10 12:43:24 -05:00
parent 1460f24746
commit 01b33ec330
2 changed files with 168 additions and 1 deletions

View File

@ -78,11 +78,15 @@ const createStreamResponseTimeout = 30 * time.Second
func (c *connection) Close() error {
c.streamLock.Lock()
for _, s := range c.streams {
s.Close()
// calling Reset instead of Close ensures that all streams are fully torn down
s.Reset()
}
c.streams = make([]httpstream.Stream, 0)
c.streamLock.Unlock()
// now that all streams are fully torn down, it's safe to call close on the underlying connection,
// which should be able to terminate immediately at this point, instead of waiting for any
// remaining graceful stream termination.
return c.conn.Close()
}

View File

@ -0,0 +1,163 @@
/*
Copyright 2016 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package spdy
import (
"io"
"net"
"net/http"
"sync"
"testing"
"time"
"k8s.io/kubernetes/pkg/util/httpstream"
)
func runProxy(t *testing.T, backendUrl string, proxyUrl chan<- string, proxyDone chan<- struct{}) {
listener, err := net.Listen("tcp4", "localhost:0")
if err != nil {
t.Fatalf("error listening: %v", err)
}
defer listener.Close()
proxyUrl <- listener.Addr().String()
clientConn, err := listener.Accept()
if err != nil {
t.Errorf("proxy: error accepting client connection: %v", err)
return
}
backendConn, err := net.Dial("tcp4", backendUrl)
if err != nil {
t.Errorf("proxy: error dialing backend: %v", err)
return
}
defer backendConn.Close()
var wg sync.WaitGroup
wg.Add(2)
go func() {
defer wg.Done()
io.Copy(backendConn, clientConn)
}()
go func() {
defer wg.Done()
io.Copy(clientConn, backendConn)
}()
wg.Wait()
proxyDone <- struct{}{}
}
func runServer(t *testing.T, backendUrl chan<- string, serverDone chan<- struct{}) {
listener, err := net.Listen("tcp4", "localhost:0")
if err != nil {
t.Fatalf("server: error listening: %v", err)
}
defer listener.Close()
backendUrl <- listener.Addr().String()
conn, err := listener.Accept()
if err != nil {
t.Errorf("server: error accepting connection: %v", err)
return
}
streamChan := make(chan httpstream.Stream)
replySentChan := make(chan (<-chan struct{}))
spdyConn, err := NewServerConnection(conn, func(stream httpstream.Stream, replySent <-chan struct{}) error {
streamChan <- stream
replySentChan <- replySent
return nil
})
if err != nil {
t.Errorf("server: error creating spdy connection: %v", err)
return
}
stream := <-streamChan
replySent := <-replySentChan
<-replySent
buf := make([]byte, 1)
_, err = stream.Read(buf)
if err != io.EOF {
t.Errorf("server: unexpected read error: %v", err)
return
}
<-spdyConn.CloseChan()
raw := spdyConn.(*connection).conn
if err := raw.Wait(15 * time.Second); err != nil {
t.Errorf("server: timed out waiting for connection closure: %v", err)
}
serverDone <- struct{}{}
}
func TestConnectionCloseIsImmediateThroughAProxy(t *testing.T) {
serverDone := make(chan struct{})
backendUrlChan := make(chan string)
go runServer(t, backendUrlChan, serverDone)
backendUrl := <-backendUrlChan
proxyDone := make(chan struct{})
proxyUrlChan := make(chan string)
go runProxy(t, backendUrl, proxyUrlChan, proxyDone)
proxyUrl := <-proxyUrlChan
conn, err := net.Dial("tcp4", proxyUrl)
if err != nil {
t.Fatalf("client: error connecting to proxy: %v", err)
}
spdyConn, err := NewClientConnection(conn)
if err != nil {
t.Fatalf("client: error creating spdy connection: %v", err)
}
if _, err := spdyConn.CreateStream(http.Header{}); err != nil {
t.Fatalf("client: error creating stream: %v", err)
}
spdyConn.Close()
raw := spdyConn.(*connection).conn
if err := raw.Wait(15 * time.Second); err != nil {
t.Fatalf("client: timed out waiting for connection closure: %v", err)
}
expired := time.NewTimer(15 * time.Second)
i := 0
for {
select {
case <-expired.C:
t.Fatalf("timed out waiting for proxy and/or server closure")
case <-serverDone:
i++
case <-proxyDone:
i++
}
if i == 2 {
break
}
}
}