Merge pull request #12870 from ptabor/20210416-fix-flake-TestSnapshot…

…V3RestoreMultiMemberAdd-master

Fix TestSnapshotV3RestoreMultiMemberAdd flakes (leaks)

client/pkg/transport/transport.go

@@ -15,6 +15,7 @@
 package transport
 
 import (
+	"context"
 	"net"
 	"net/http"
 	"strings"
@@ -31,11 +32,11 @@ func NewTransport(info TLSInfo, dialtimeoutd time.Duration) (*http.Transport, er
 
 	t := &http.Transport{
 		Proxy: http.ProxyFromEnvironment,
-		Dial: (&net.Dialer{
+		DialContext: (&net.Dialer{
 			Timeout: dialtimeoutd,
 			// value taken from http.DefaultTransport
 			KeepAlive: 30 * time.Second,
-		}).Dial,
+		}).DialContext,
 		// value taken from http.DefaultTransport
 		TLSHandshakeTimeout: 10 * time.Second,
 		TLSClientConfig:     cfg,
@@ -45,15 +46,20 @@ func NewTransport(info TLSInfo, dialtimeoutd time.Duration) (*http.Transport, er
 		Timeout:   dialtimeoutd,
 		KeepAlive: 30 * time.Second,
 	}
-	dial := func(net, addr string) (net.Conn, error) {
-		return dialer.Dial("unix", addr)
-	}
 
+	dialContext := func(ctx context.Context, net, addr string) (net.Conn, error) {
+		return dialer.DialContext(ctx, "unix", addr)
+	}
 	tu := &http.Transport{
 		Proxy:               http.ProxyFromEnvironment,
-		Dial:                dial,
+		DialContext:         dialContext,
 		TLSHandshakeTimeout: 10 * time.Second,
 		TLSClientConfig:     cfg,
+		// Cost of reopening connection on sockets is low, and they are mostly used in testing.
+		// Long living unix-transport connections were leading to 'leak' test flakes.
+		// Alternativly the returned Transport (t) should override CloseIdleConnections to
+		// forward it to 'tu' as well.
+		IdleConnTimeout: time.Microsecond,
 	}
 	ut := &unixTransport{tu}
 

pkg/proxy/server.go

@@ -15,6 +15,7 @@
 package proxy
 
 import (
+	"context"
 	"fmt"
 	"io"
 	mrand "math/rand"
@@ -295,6 +296,7 @@ func (s *server) To() string {
 func (s *server) listenAndServe() {
 	defer s.closeWg.Done()
 
+	ctx := context.Background()
 	s.lg.Info("proxy is listening on", zap.String("from", s.From()))
 	close(s.readyc)
 
@@ -380,7 +382,7 @@ func (s *server) listenAndServe() {
 				}
 				continue
 			}
-			out, err = tp.Dial(s.to.Scheme, s.to.Host)
+			out, err = tp.DialContext(ctx, s.to.Scheme, s.to.Host)
 		} else {
 			out, err = net.Dial(s.to.Scheme, s.to.Host)
 		}

pkg/proxy/server_test.go

@@ -16,6 +16,7 @@ package proxy
 
 import (
 	"bytes"
+	"context"
 	"crypto/tls"
 	"fmt"
 	"io/ioutil"
@@ -615,7 +616,7 @@ func send(t *testing.T, data []byte, scheme, addr string, tlsInfo transport.TLSI
 		if terr != nil {
 			t.Fatal(terr)
 		}
-		out, err = tp.Dial(scheme, addr)
+		out, err = tp.DialContext(context.Background(), scheme, addr)
 	} else {
 		out, err = net.Dial(scheme, addr)
 	}

server/etcdserver/api/rafthttp/pipeline.go

@@ -19,6 +19,7 @@ import (
 	"context"
 	"errors"
 	"io/ioutil"
+	"runtime"
 	"sync"
 	"time"
 
@@ -139,6 +140,7 @@ func (p *pipeline) post(data []byte) (err error) {
 	go func() {
 		select {
 		case <-done:
+			cancel()
 		case <-p.stopc:
 			waitSchedule()
 			cancel()
@@ -173,4 +175,4 @@ func (p *pipeline) post(data []byte) (err error) {
 }
 
 // waitSchedule waits other goroutines to be scheduled for a while
-func waitSchedule() { time.Sleep(time.Millisecond) }
+func waitSchedule() { runtime.Gosched() }