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68 lines
2.0 KiB
Go
68 lines
2.0 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package util
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import (
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"fmt"
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"net"
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"strconv"
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"k8s.io/klog/v2"
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)
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// LocalPort describes a port on specific IP address and protocol
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type LocalPort struct {
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// Description is the identity message of a given local port.
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Description string
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// IP is the IP address part of a given local port.
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// If this string is empty, the port binds to all local IP addresses.
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IP string
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// Port is the port part of a given local port.
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Port int
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// Protocol is the protocol part of a given local port.
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// The value is assumed to be lower-case. For example, "udp" not "UDP", "tcp" not "TCP".
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Protocol string
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}
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func (lp *LocalPort) String() string {
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ipPort := net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port))
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return fmt.Sprintf("%q (%s/%s)", lp.Description, ipPort, lp.Protocol)
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}
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// Closeable is an interface around closing a port.
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type Closeable interface {
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Close() error
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}
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// PortOpener is an interface around port opening/closing.
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// Abstracted out for testing.
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type PortOpener interface {
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OpenLocalPort(lp *LocalPort, isIPv6 bool) (Closeable, error)
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}
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// RevertPorts is closing ports in replacementPortsMap but not in originalPortsMap. In other words, it only
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// closes the ports opened in this sync.
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func RevertPorts(replacementPortsMap, originalPortsMap map[LocalPort]Closeable) {
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for k, v := range replacementPortsMap {
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// Only close newly opened local ports - leave ones that were open before this update
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if originalPortsMap[k] == nil {
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klog.V(2).Infof("Closing local port %s", k.String())
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v.Close()
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}
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}
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}
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