peridot/vendor/cloud.google.com/go/auth/grpctransport/dial_socketopt.go

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// Copyright 2023 Google LLC
//
// 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.
//go:build linux
// +build linux
package grpctransport
import (
"context"
"net"
"syscall"
"google.golang.org/grpc"
)
const (
// defaultTCPUserTimeout is the default TCP_USER_TIMEOUT socket option. By
// default is 20 seconds.
tcpUserTimeoutMilliseconds = 20000
// Copied from golang.org/x/sys/unix.TCP_USER_TIMEOUT.
tcpUserTimeoutOp = 0x12
)
func init() {
// timeoutDialerOption is a grpc.DialOption that contains dialer with
// socket option TCP_USER_TIMEOUT. This dialer requires go versions 1.11+.
timeoutDialerOption = grpc.WithContextDialer(dialTCPUserTimeout)
}
func dialTCPUserTimeout(ctx context.Context, addr string) (net.Conn, error) {
control := func(network, address string, c syscall.RawConn) error {
var syscallErr error
controlErr := c.Control(func(fd uintptr) {
syscallErr = syscall.SetsockoptInt(
int(fd), syscall.IPPROTO_TCP, tcpUserTimeoutOp, tcpUserTimeoutMilliseconds)
})
if syscallErr != nil {
return syscallErr
}
if controlErr != nil {
return controlErr
}
return nil
}
d := &net.Dialer{
Control: control,
}
return d.DialContext(ctx, "tcp", addr)
}