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net.go
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net.go
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// Copyright 2014 The Cockroach Authors.
//
// 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.
//
// Author: Tamir Duberstein (tamird@gmail.com)
package netutil
import (
"crypto/tls"
"io"
"net"
"net/http"
"strings"
"time"
"google.golang.org/grpc"
"golang.org/x/net/context"
"golang.org/x/net/http2"
"github.com/cockroachdb/cmux"
"github.com/cockroachdb/cockroach/pkg/util/log"
"github.com/cockroachdb/cockroach/pkg/util/stop"
"github.com/cockroachdb/cockroach/pkg/util/syncutil"
)
// ListenAndServeGRPC creates a listener and serves the specified grpc Server
// on it, closing the listener when signalled by the stopper.
func ListenAndServeGRPC(
stopper *stop.Stopper, server *grpc.Server, addr net.Addr,
) (net.Listener, error) {
ln, err := net.Listen(addr.Network(), addr.String())
if err != nil {
return ln, err
}
ctx := context.TODO()
stopper.RunWorker(ctx, func(context.Context) {
<-stopper.ShouldQuiesce()
FatalIfUnexpected(ln.Close())
<-stopper.ShouldStop()
server.Stop()
})
stopper.RunWorker(ctx, func(context.Context) {
FatalIfUnexpected(server.Serve(ln))
})
return ln, nil
}
var httpLogger = log.NewStdLogger(log.Severity_ERROR)
// Server is a thin wrapper around http.Server. See MakeServer for more detail.
type Server struct {
*http.Server
}
// MakeServer constructs a Server that tracks active connections, closing them
// when signalled by stopper.
func MakeServer(stopper *stop.Stopper, tlsConfig *tls.Config, handler http.Handler) Server {
var mu syncutil.Mutex
activeConns := make(map[net.Conn]struct{})
server := Server{
Server: &http.Server{
Handler: handler,
TLSConfig: tlsConfig,
ConnState: func(conn net.Conn, state http.ConnState) {
mu.Lock()
switch state {
case http.StateNew:
activeConns[conn] = struct{}{}
case http.StateClosed:
delete(activeConns, conn)
}
mu.Unlock()
},
ErrorLog: httpLogger,
},
}
ctx := context.TODO()
// net/http.(*Server).Serve/http2.ConfigureServer are not thread safe with
// respect to net/http.(*Server).TLSConfig, so we call it synchronously here.
if err := http2.ConfigureServer(server.Server, nil); err != nil {
log.Fatal(ctx, err)
}
stopper.RunWorker(ctx, func(context.Context) {
<-stopper.ShouldStop()
mu.Lock()
for conn := range activeConns {
conn.Close()
}
mu.Unlock()
})
return server
}
// ServeWith accepts connections on ln and serves them using serveConn.
func (s *Server) ServeWith(
ctx context.Context, stopper *stop.Stopper, l net.Listener, serveConn func(net.Conn),
) error {
// Inspired by net/http.(*Server).Serve
var tempDelay time.Duration // how long to sleep on accept failure
for {
rw, e := l.Accept()
if e != nil {
if ne, ok := e.(net.Error); ok && ne.Temporary() {
if tempDelay == 0 {
tempDelay = 5 * time.Millisecond
} else {
tempDelay *= 2
}
if max := 1 * time.Second; tempDelay > max {
tempDelay = max
}
httpLogger.Printf("http: Accept error: %v; retrying in %v", e, tempDelay)
time.Sleep(tempDelay)
continue
}
return e
}
tempDelay = 0
go func() {
defer stopper.Recover(ctx)
s.Server.ConnState(rw, http.StateNew) // before Serve can return
serveConn(rw)
s.Server.ConnState(rw, http.StateClosed)
}()
}
}
// IsClosedConnection returns true if err is cmux.ErrListenerClosed,
// grpc.ErrServerStopped, io.EOF, or the net package's errClosed.
func IsClosedConnection(err error) bool {
return err == cmux.ErrListenerClosed ||
err == grpc.ErrServerStopped ||
err == io.EOF ||
strings.Contains(err.Error(), "use of closed network connection")
}
// FatalIfUnexpected calls Log.Fatal(err) unless err is nil,
// cmux.ErrListenerClosed, or the net package's errClosed.
func FatalIfUnexpected(err error) {
if err != nil && !IsClosedConnection(err) {
log.Fatal(context.TODO(), err)
}
}