mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
119 lines
2.8 KiB
Go
119 lines
2.8 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// Package netutil implements network-related utility functions.
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package netutil
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import (
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"net"
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"net/url"
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"reflect"
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"sort"
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"github.com/coreos/etcd/pkg/types"
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"github.com/coreos/pkg/capnslog"
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)
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var (
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plog = capnslog.NewPackageLogger("github.com/coreos/etcd/pkg", "netutil")
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// indirection for testing
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resolveTCPAddr = net.ResolveTCPAddr
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)
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// resolveTCPAddrs is a convenience wrapper for net.ResolveTCPAddr.
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// resolveTCPAddrs return a new set of url.URLs, in which all DNS hostnames
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// are resolved.
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func resolveTCPAddrs(urls [][]url.URL) ([][]url.URL, error) {
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newurls := make([][]url.URL, 0)
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for _, us := range urls {
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nus := make([]url.URL, len(us))
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for i, u := range us {
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nu, err := url.Parse(u.String())
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if err != nil {
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return nil, err
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}
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nus[i] = *nu
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}
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for i, u := range nus {
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host, _, err := net.SplitHostPort(u.Host)
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if err != nil {
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plog.Errorf("could not parse url %s during tcp resolving", u.Host)
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return nil, err
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}
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if host == "localhost" {
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continue
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}
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if net.ParseIP(host) != nil {
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continue
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}
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tcpAddr, err := resolveTCPAddr("tcp", u.Host)
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if err != nil {
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plog.Errorf("could not resolve host %s", u.Host)
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return nil, err
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}
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plog.Infof("resolving %s to %s", u.Host, tcpAddr.String())
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nus[i].Host = tcpAddr.String()
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}
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newurls = append(newurls, nus)
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}
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return newurls, nil
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}
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// urlsEqual checks equality of url.URLS between two arrays.
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// This check pass even if an URL is in hostname and opposite is in IP address.
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func urlsEqual(a []url.URL, b []url.URL) bool {
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if len(a) != len(b) {
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return false
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}
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urls, err := resolveTCPAddrs([][]url.URL{a, b})
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if err != nil {
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return false
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}
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a, b = urls[0], urls[1]
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sort.Sort(types.URLs(a))
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sort.Sort(types.URLs(b))
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for i := range a {
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if !reflect.DeepEqual(a[i], b[i]) {
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return false
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}
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}
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return true
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}
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func URLStringsEqual(a []string, b []string) bool {
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if len(a) != len(b) {
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return false
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}
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urlsA := make([]url.URL, 0)
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for _, str := range a {
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u, err := url.Parse(str)
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if err != nil {
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return false
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}
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urlsA = append(urlsA, *u)
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}
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urlsB := make([]url.URL, 0)
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for _, str := range b {
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u, err := url.Parse(str)
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if err != nil {
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return false
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}
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urlsB = append(urlsB, *u)
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}
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return urlsEqual(urlsA, urlsB)
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}
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