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55 lines
1.9 KiB
Go
55 lines
1.9 KiB
Go
//go:build unix
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/*
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* Copyright 2023 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package internal
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import (
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"net"
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"syscall"
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"time"
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"golang.org/x/sys/unix"
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)
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// NetDialerWithTCPKeepalive returns a net.Dialer that enables TCP keepalives on
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// the underlying connection with OS default values for keepalive parameters.
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//
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// TODO: Once https://github.com/golang/go/issues/62254 lands, and the
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// appropriate Go version becomes less than our least supported Go version, we
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// should look into using the new API to make things more straightforward.
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func NetDialerWithTCPKeepalive() *net.Dialer {
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return &net.Dialer{
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// Setting a negative value here prevents the Go stdlib from overriding
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// the values of TCP keepalive time and interval. It also prevents the
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// Go stdlib from enabling TCP keepalives by default.
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KeepAlive: time.Duration(-1),
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// This method is called after the underlying network socket is created,
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// but before dialing the socket (or calling its connect() method). The
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// combination of unconditionally enabling TCP keepalives here, and
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// disabling the overriding of TCP keepalive parameters by setting the
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// KeepAlive field to a negative value above, results in OS defaults for
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// the TCP keepalive interval and time parameters.
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Control: func(_, _ string, c syscall.RawConn) error {
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return c.Control(func(fd uintptr) {
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unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_KEEPALIVE, 1)
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})
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},
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}
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}
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