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add custom dialer optimized for probes

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probe util dial set linger to 1s
This commit is contained in:
Antonio Ojea 2023-01-17 11:19:23 +00:00
parent 02f893b6e2
commit 1978008c8f
2 changed files with 84 additions and 0 deletions
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42
pkg/probe/dialer_others.go Normal file
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//go:build !windows
// +build !windows
/*
Copyright 2023 The Kubernetes 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 probe
import (
"net"
"syscall"
)
// ProbeDialer returns a dialer optimized for probes to avoid lingering sockets on TIME-WAIT state.
// The dialer reduces the TIME-WAIT period to 1 seconds instead of the OS default of 60 seconds.
// Using 1 second instead of 0 because SO_LINGER socket option to 0 causes pending data to be
// discarded and the connection to be aborted with an RST rather than for the pending data to be
// transmitted and the connection closed cleanly with a FIN.
// Ref: https://issues.k8s.io/89898
func ProbeDialer() *net.Dialer {
dialer := &net.Dialer{
Control: func(network, address string, c syscall.RawConn) error {
return c.Control(func(fd uintptr) {
syscall.SetsockoptLinger(int(fd), syscall.SOL_SOCKET, syscall.SO_LINGER, &syscall.Linger{Onoff: 1, Linger: 1})
})
},
}
return dialer
}

42
pkg/probe/dialer_windows.go Normal file
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//go:build windows
// +build windows
/*
Copyright 2023 The Kubernetes 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 probe
import (
"net"
"syscall"
)
// ProbeDialer returns a dialer optimized for probes to avoid lingering sockets on TIME-WAIT state.
// The dialer reduces the TIME-WAIT period to 1 seconds instead of the OS default of 60 seconds.
// Using 1 second instead of 0 because SO_LINGER socket option to 0 causes pending data to be
// discarded and the connection to be aborted with an RST rather than for the pending data to be
// transmitted and the connection closed cleanly with a FIN.
// Ref: https://issues.k8s.io/89898
func ProbeDialer() *net.Dialer {
dialer := &net.Dialer{
Control: func(network, address string, c syscall.RawConn) error {
return c.Control(func(fd uintptr) {
syscall.SetsockoptLinger(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_LINGER, &syscall.Linger{Onoff: 1, Linger: 1})
})
},
}
return dialer
}