forked from github/multus-cni
ac21a96804
gomodule is still in progress to migrate for now, hence multus team decide to keep vendor directory to support build without gomodule.
112 lines
2.9 KiB
Go
112 lines
2.9 KiB
Go
// +build freebsd linux darwin
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/*
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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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"net/url"
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"os"
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"path/filepath"
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"time"
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"golang.org/x/sys/unix"
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"k8s.io/klog"
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)
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const (
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// unixProtocol is the network protocol of unix socket.
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unixProtocol = "unix"
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)
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func CreateListener(endpoint string) (net.Listener, error) {
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protocol, addr, err := parseEndpointWithFallbackProtocol(endpoint, unixProtocol)
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if err != nil {
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return nil, err
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}
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if protocol != unixProtocol {
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return nil, fmt.Errorf("only support unix socket endpoint")
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}
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// Unlink to cleanup the previous socket file.
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err = unix.Unlink(addr)
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if err != nil && !os.IsNotExist(err) {
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return nil, fmt.Errorf("failed to unlink socket file %q: %v", addr, err)
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}
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return net.Listen(protocol, addr)
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}
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func GetAddressAndDialer(endpoint string) (string, func(addr string, timeout time.Duration) (net.Conn, error), error) {
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protocol, addr, err := parseEndpointWithFallbackProtocol(endpoint, unixProtocol)
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if err != nil {
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return "", nil, err
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}
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if protocol != unixProtocol {
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return "", nil, fmt.Errorf("only support unix socket endpoint")
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}
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return addr, dial, nil
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}
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func dial(addr string, timeout time.Duration) (net.Conn, error) {
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return net.DialTimeout(unixProtocol, addr, timeout)
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}
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func parseEndpointWithFallbackProtocol(endpoint string, fallbackProtocol string) (protocol string, addr string, err error) {
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if protocol, addr, err = parseEndpoint(endpoint); err != nil && protocol == "" {
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fallbackEndpoint := fallbackProtocol + "://" + endpoint
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protocol, addr, err = parseEndpoint(fallbackEndpoint)
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if err == nil {
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klog.Warningf("Using %q as endpoint is deprecated, please consider using full url format %q.", endpoint, fallbackEndpoint)
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}
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}
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return
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}
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func parseEndpoint(endpoint string) (string, string, error) {
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u, err := url.Parse(endpoint)
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if err != nil {
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return "", "", err
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}
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switch u.Scheme {
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case "tcp":
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return "tcp", u.Host, nil
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case "unix":
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return "unix", u.Path, nil
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case "":
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return "", "", fmt.Errorf("Using %q as endpoint is deprecated, please consider using full url format", endpoint)
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default:
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return u.Scheme, "", fmt.Errorf("protocol %q not supported", u.Scheme)
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}
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}
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// LocalEndpoint returns the full path to a unix socket at the given endpoint
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func LocalEndpoint(path, file string) string {
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u := url.URL{
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Scheme: unixProtocol,
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Path: path,
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}
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return filepath.Join(u.String(), file+".sock")
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}
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