mirror of https://github.com/k3s-io/k3s
112 lines
2.9 KiB
Go
112 lines
2.9 KiB
Go
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// +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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