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