36 lines
1.2 KiB
Go
36 lines
1.2 KiB
Go
package net
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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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func newDefaultDialer() net.Dialer {
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// From `grpc.WithContextDialer` comment:
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//
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// Note: All supported releases of Go (as of December 2023) override the OS
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// defaults for TCP keepalive time and interval to 15s. To enable TCP keepalive
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// with OS defaults for keepalive time and interval, use a net.Dialer that sets
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// the KeepAlive field to a negative value, and sets the SO_KEEPALIVE socket
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// option to true from the Control field. For a concrete example of how to do
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// this, see internal.NetDialerWithTCPKeepalive().
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//
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// https://github.com/grpc/grpc-go/blob/830135e6c5a351abf75f0c9cfdf978e5df8daeba/dialoptions.go#L432
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//
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// From `internal.NetDialerWithTCPKeepalive` comment:
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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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return net.Dialer{
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KeepAlive: time.Duration(-1),
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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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