/*
*
* Copyright 2017 gRPC authors.
*
* 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 naming
import (
"fmt"
"net"
"reflect"
"sync"
"testing"
"time"
)
func newUpdateWithMD(op Operation, addr, lb string) *Update {
return &Update{
Op: op,
Addr: addr,
Metadata: AddrMetadataGRPCLB{AddrType: GRPCLB, ServerName: lb},
}
}
func toMap(u []*Update) map[string]*Update {
m := make(map[string]*Update)
for _, v := range u {
m[v.Addr] = v
}
return m
}
func TestCompileUpdate(t *testing.T) {
tests := []struct {
oldAddrs []string
newAddrs []string
want []*Update
}{
{
[]string{},
[]string{"1.0.0.1"},
[]*Update{{Op: Add, Addr: "1.0.0.1"}},
},
{
[]string{"1.0.0.1"},
[]string{"1.0.0.1"},
[]*Update{},
},
{
[]string{"1.0.0.0"},
[]string{"1.0.0.1"},
[]*Update{{Op: Delete, Addr: "1.0.0.0"}, {Op: Add, Addr: "1.0.0.1"}},
},
{
[]string{"1.0.0.1"},
[]string{"1.0.0.0"},
[]*Update{{Op: Add, Addr: "1.0.0.0"}, {Op: Delete, Addr: "1.0.0.1"}},
},
{
[]string{"1.0.0.1"},
[]string{"1.0.0.1", "1.0.0.2", "1.0.0.3"},
[]*Update{{Op: Add, Addr: "1.0.0.2"}, {Op: Add, Addr: "1.0.0.3"}},
},
{
[]string{"1.0.0.1", "1.0.0.2", "1.0.0.3"},
[]string{"1.0.0.0"},
[]*Update{{Op: Add, Addr: "1.0.0.0"}, {Op: Delete, Addr: "1.0.0.1"}, {Op: Delete, Addr: "1.0.0.2"}, {Op: Delete, Addr: "1.0.0.3"}},
},
{
[]string{"1.0.0.1", "1.0.0.3", "1.0.0.5"},
[]string{"1.0.0.2", "1.0.0.3", "1.0.0.6"},
[]*Update{{Op: Delete, Addr: "1.0.0.1"}, {Op: Add, Addr: "1.0.0.2"}, {Op: Delete, Addr: "1.0.0.5"}, {Op: Add, Addr: "1.0.0.6"}},
},
{
[]string{"1.0.0.1", "1.0.0.1", "1.0.0.2"},
[]string{"1.0.0.1"},
[]*Update{{Op: Delete, Addr: "1.0.0.2"}},
},
}
var w dnsWatcher
for _, c := range tests {
w.curAddrs = make(map[string]*Update)
newUpdates := make(map[string]*Update)
for _, a := range c.oldAddrs {
w.curAddrs[a] = &Update{Addr: a}
}
for _, a := range c.newAddrs {
newUpdates[a] = &Update{Addr: a}
}
r := w.compileUpdate(newUpdates)
if !reflect.DeepEqual(toMap(c.want), toMap(r)) {
t.Errorf("w(%+v).compileUpdate(%+v) = %+v, want %+v", c.oldAddrs, c.newAddrs, updatesToSlice(r), updatesToSlice(c.want))
}
}
}
func TestResolveFunc(t *testing.T) {
tests := []struct {
addr string
want error
}{
// TODO(yuxuanli): More false cases?
{"www.google.com", nil},
{"foo.bar:12345", nil},
{"127.0.0.1", nil},
{"127.0.0.1:12345", nil},
{"[::1]:80", nil},
{"[2001:db8:a0b:12f0::1]:21", nil},
{":80", nil},
{"127.0.0...1:12345", nil},
{"[fe80::1%lo0]:80", nil},
{"golang.org:http", nil},
{"[2001:db8::1]:http", nil},
{":", nil},
{"", errMissingAddr},
{"[2001:db8:a0b:12f0::1", fmt.Errorf("invalid target address %v", "[2001:db8:a0b:12f0::1")},
}
r, err := NewDNSResolver()
if err != nil {
t.Errorf("%v", err)
}
for _, v := range tests {
_, err := r.Resolve(v.addr)
if !reflect.DeepEqual(err, v.want) {
t.Errorf("Resolve(%q) = %v, want %v", v.addr, err, v.want)
}
}
}
var hostLookupTbl = map[string][]string{
"foo.bar.com": {"1.2.3.4", "5.6.7.8"},
"ipv4.single.fake": {"1.2.3.4"},
"ipv4.multi.fake": {"1.2.3.4", "5.6.7.8", "9.10.11.12"},
"ipv6.single.fake": {"2607:f8b0:400a:801::1001"},
"ipv6.multi.fake": {"2607:f8b0:400a:801::1001", "2607:f8b0:400a:801::1002", "2607:f8b0:400a:801::1003"},
}
func hostLookup(host string) ([]string, error) {
if addrs, ok := hostLookupTbl[host]; ok {
return addrs, nil
}
return nil, fmt.Errorf("failed to lookup host:%s resolution in hostLookupTbl", host)
}
var srvLookupTbl = map[string][]*net.SRV{
"_grpclb._tcp.srv.ipv4.single.fake": {&net.SRV{Target: "ipv4.single.fake", Port: 1234}},
"_grpclb._tcp.srv.ipv4.multi.fake": {&net.SRV{Target: "ipv4.multi.fake", Port: 1234}},
"_grpclb._tcp.srv.ipv6.single.fake": {&net.SRV{Target: "ipv6.single.fake", Port: 1234}},
"_grpclb._tcp.srv.ipv6.multi.fake": {&net.SRV{Target: "ipv6.multi.fake", Port: 1234}},
}
func srvLookup(service, proto, name string) (string, []*net.SRV, error) {
cname := "_" + service + "._" + proto + "." + name
if srvs, ok := srvLookupTbl[cname]; ok {
return cname, srvs, nil
}
return "", nil, fmt.Errorf("failed to lookup srv record for %s in srvLookupTbl", cname)
}
func updatesToSlice(updates []*Update) []Update {
res := make([]Update, len(updates))
for i, u := range updates {
res[i] = *u
}
return res
}
func testResolver(t *testing.T, freq time.Duration, slp time.Duration) {
tests := []struct {
target string
want []*Update
}{
{
"foo.bar.com",
[]*Update{{Op: Add, Addr: "1.2.3.4" + colonDefaultPort}, {Op: Add, Addr: "5.6.7.8" + colonDefaultPort}},
},
{
"foo.bar.com:1234",
[]*Update{{Op: Add, Addr: "1.2.3.4:1234"}, {Op: Add, Addr: "5.6.7.8:1234"}},
},
{
"srv.ipv4.single.fake",
[]*Update{newUpdateWithMD(Add, "1.2.3.4:1234", "ipv4.single.fake")},
},
{
"srv.ipv4.multi.fake",
[]*Update{
newUpdateWithMD(Add, "1.2.3.4:1234", "ipv4.multi.fake"),
newUpdateWithMD(Add, "5.6.7.8:1234", "ipv4.multi.fake"),
newUpdateWithMD(Add, "9.10.11.12:1234", "ipv4.multi.fake")},
},
{
"srv.ipv6.single.fake",
[]*Update{newUpdateWithMD(Add, "[2607:f8b0:400a:801::1001]:1234", "ipv6.single.fake")},
},
{
"srv.ipv6.multi.fake",
[]*Update{
newUpdateWithMD(Add, "[2607:f8b0:400a:801::1001]:1234", "ipv6.multi.fake"),
newUpdateWithMD(Add, "[2607:f8b0:400a:801::1002]:1234", "ipv6.multi.fake"),
newUpdateWithMD(Add, "[2607:f8b0:400a:801::1003]:1234", "ipv6.multi.fake"),
},
},
}
for _, a := range tests {
r, err := NewDNSResolverWithFreq(freq)
if err != nil {
t.Fatalf("%v\n", err)
}
w, err := r.Resolve(a.target)
if err != nil {
t.Fatalf("%v\n", err)
}
updates, err := w.Next()
if err != nil {
t.Fatalf("%v\n", err)
}
if !reflect.DeepEqual(toMap(a.want), toMap(updates)) {
t.Errorf("Resolve(%q) = %+v, want %+v\n", a.target, updatesToSlice(updates), updatesToSlice(a.want))
}
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
for {
_, err := w.Next()
if err != nil {
return
}
t.Error("Execution shouldn't reach here, since w.Next() should be blocked until close happen.")
}
}()
// Sleep for sometime to let watcher do more than one lookup
time.Sleep(slp)
w.Close()
wg.Wait()
}
}
func TestResolve(t *testing.T) {
defer replaceNetFunc()()
testResolver(t, time.Millisecond*5, time.Millisecond*10)
}
const colonDefaultPort = ":" + defaultPort
func TestIPWatcher(t *testing.T) {
tests := []struct {
target string
want []*Update
}{
{"127.0.0.1", []*Update{{Op: Add, Addr: "127.0.0.1" + colonDefaultPort}}},
{"127.0.0.1:12345", []*Update{{Op: Add, Addr: "127.0.0.1:12345"}}},
{"::1", []*Update{{Op: Add, Addr: "[::1]" + colonDefaultPort}}},
{"[::1]:12345", []*Update{{Op: Add, Addr: "[::1]:12345"}}},
{"[::1]:", []*Update{{Op: Add, Addr: "[::1]:443"}}},
{"2001:db8:85a3::8a2e:370:7334", []*Update{{Op: Add, Addr: "[2001:db8:85a3::8a2e:370:7334]" + colonDefaultPort}}},
{"[2001:db8:85a3::8a2e:370:7334]", []*Update{{Op: Add, Addr: "[2001:db8:85a3::8a2e:370:7334]" + colonDefaultPort}}},
{"[2001:db8:85a3::8a2e:370:7334]:12345", []*Update{{Op: Add, Addr: "[2001:db8:85a3::8a2e:370:7334]:12345"}}},
{"[2001:db8::1]:http", []*Update{{Op: Add, Addr: "[2001:db8::1]:http"}}},
// TODO(yuxuanli): zone support?
}
for _, v := range tests {
r, err := NewDNSResolverWithFreq(time.Millisecond * 5)
if err != nil {
t.Fatalf("%v\n", err)
}
w, err := r.Resolve(v.target)
if err != nil {
t.Fatalf("%v\n", err)
}
var updates []*Update
var wg sync.WaitGroup
wg.Add(1)
count := 0
go func() {
defer wg.Done()
for {
u, err := w.Next()
if err != nil {
return
}
updates = u
count++
}
}()
// Sleep for sometime to let watcher do more than one lookup
time.Sleep(time.Millisecond * 10)
w.Close()
wg.Wait()
if !reflect.DeepEqual(v.want, updates) {
t.Errorf("Resolve(%q) = %v, want %+v\n", v.target, updatesToSlice(updates), updatesToSlice(v.want))
}
if count != 1 {
t.Errorf("IPWatcher Next() should return only once, not %d times\n", count)
}
}
}