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/* | ||
* Copyright 2023 gRPC 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. | ||
* | ||
*/ | ||
|
||
package internal | ||
|
||
import ( | ||
"net" | ||
"syscall" | ||
"time" | ||
) | ||
|
||
// NetDialerWithTCPKeepalive returns a net.Dialer that enables TCP keepalives on | ||
// the underlying connection with OS default values for keepalive parameters. | ||
// | ||
// TODO: Once https://github.com/golang/go/issues/62254 lands, and the | ||
// appropriate Go version becomes less than our least supported Go version, we | ||
// should look into using the new API to make things more straightforward. | ||
func NetDialerWithTCPKeepalive() *net.Dialer { | ||
return &net.Dialer{ | ||
// Setting a negative value here prevents the Go stdlib from overriding | ||
// the values of TCP keepalive time and interval. It also prevents the | ||
// Go stdlib from enabling TCP keepalives by default. | ||
KeepAlive: time.Duration(-1), | ||
// This method is called after the underlying network socket is created, | ||
// but before dialing the socket (or calling its connect() method). The | ||
// combination of unconditionally enabling TCP keepalives here, and | ||
// disabling the overriding of TCP keepalive parameters by setting the | ||
// KeepAlive field to a negative value above, results in OS defaults for | ||
// the TCP keealive interval and time parameters. | ||
Control: func(_, _ string, c syscall.RawConn) error { | ||
return c.Control(func(fd uintptr) { | ||
syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, 1) | ||
}) | ||
}, | ||
} | ||
} |
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