| /* |
| * |
| * Copyright 2018 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 dns |
| |
| import ( |
| "context" |
| "errors" |
| "fmt" |
| "net" |
| "os" |
| "reflect" |
| "sync" |
| "testing" |
| "time" |
| |
| "google.golang.org/grpc/internal/leakcheck" |
| "google.golang.org/grpc/resolver" |
| ) |
| |
| func TestMain(m *testing.M) { |
| cleanup := replaceNetFunc() |
| code := m.Run() |
| cleanup() |
| os.Exit(code) |
| } |
| |
| const ( |
| txtBytesLimit = 255 |
| ) |
| |
| type testClientConn struct { |
| target string |
| m1 sync.Mutex |
| addrs []resolver.Address |
| a int // how many times NewAddress() has been called |
| m2 sync.Mutex |
| sc string |
| s int |
| } |
| |
| func (t *testClientConn) NewAddress(addresses []resolver.Address) { |
| t.m1.Lock() |
| defer t.m1.Unlock() |
| t.addrs = addresses |
| t.a++ |
| } |
| |
| func (t *testClientConn) getAddress() ([]resolver.Address, int) { |
| t.m1.Lock() |
| defer t.m1.Unlock() |
| return t.addrs, t.a |
| } |
| |
| func (t *testClientConn) NewServiceConfig(serviceConfig string) { |
| t.m2.Lock() |
| defer t.m2.Unlock() |
| t.sc = serviceConfig |
| t.s++ |
| } |
| |
| func (t *testClientConn) getSc() (string, int) { |
| t.m2.Lock() |
| defer t.m2.Unlock() |
| return t.sc, t.s |
| } |
| |
| type testResolver struct { |
| } |
| |
| func (*testResolver) LookupHost(ctx context.Context, host string) ([]string, error) { |
| return hostLookup(host) |
| } |
| |
| func (*testResolver) LookupSRV(ctx context.Context, service, proto, name string) (string, []*net.SRV, error) { |
| return srvLookup(service, proto, name) |
| } |
| |
| func (*testResolver) LookupTXT(ctx context.Context, host string) ([]string, error) { |
| return txtLookup(host) |
| } |
| |
| func replaceNetFunc() func() { |
| oldResolver := defaultResolver |
| defaultResolver = &testResolver{} |
| |
| return func() { |
| defaultResolver = oldResolver |
| } |
| } |
| |
| var hostLookupTbl = struct { |
| sync.Mutex |
| tbl map[string][]string |
| }{ |
| tbl: map[string][]string{ |
| "foo.bar.com": {"1.2.3.4", "5.6.7.8"}, |
| "ipv4.single.fake": {"1.2.3.4"}, |
| "srv.ipv4.single.fake": {"2.4.6.8"}, |
| "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) { |
| hostLookupTbl.Lock() |
| defer hostLookupTbl.Unlock() |
| if addrs, cnt := hostLookupTbl.tbl[host]; cnt { |
| return addrs, nil |
| } |
| return nil, fmt.Errorf("failed to lookup host:%s resolution in hostLookupTbl", host) |
| } |
| |
| var srvLookupTbl = struct { |
| sync.Mutex |
| tbl map[string][]*net.SRV |
| }{ |
| tbl: 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 |
| srvLookupTbl.Lock() |
| defer srvLookupTbl.Unlock() |
| if srvs, cnt := srvLookupTbl.tbl[cname]; cnt { |
| return cname, srvs, nil |
| } |
| return "", nil, fmt.Errorf("failed to lookup srv record for %s in srvLookupTbl", cname) |
| } |
| |
| // div divides a byte slice into a slice of strings, each of which is of maximum |
| // 255 bytes length, which is the length limit per TXT record in DNS. |
| func div(b []byte) []string { |
| var r []string |
| for i := 0; i < len(b); i += txtBytesLimit { |
| if i+txtBytesLimit > len(b) { |
| r = append(r, string(b[i:])) |
| } else { |
| r = append(r, string(b[i:i+txtBytesLimit])) |
| } |
| } |
| return r |
| } |
| |
| // scfs contains an array of service config file string in JSON format. |
| // Notes about the scfs contents and usage: |
| // scfs contains 4 service config file JSON strings for testing. Inside each |
| // service config file, there are multiple choices. scfs[0:3] each contains 5 |
| // choices, and first 3 choices are nonmatching choices based on canarying rule, |
| // while the last two are matched choices. scfs[3] only contains 3 choices, and |
| // all of them are nonmatching based on canarying rule. For each of scfs[0:3], |
| // the eventually returned service config, which is from the first of the two |
| // matched choices, is stored in the corresponding scs element (e.g. |
| // scfs[0]->scs[0]). scfs and scs elements are used in pair to test the dns |
| // resolver functionality, with scfs as the input and scs used for validation of |
| // the output. For scfs[3], it corresponds to empty service config, since there |
| // isn't a matched choice. |
| var scfs = []string{ |
| `[ |
| { |
| "clientLanguage": [ |
| "CPP", |
| "JAVA" |
| ], |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "percentage": 0, |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "clientHostName": [ |
| "localhost" |
| ], |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "clientLanguage": [ |
| "GO" |
| ], |
| "percentage": 100, |
| "serviceConfig": { |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "method": "bar" |
| } |
| ], |
| "maxRequestMessageBytes": 1024, |
| "maxResponseMessageBytes": 1024 |
| } |
| ] |
| } |
| }, |
| { |
| "serviceConfig": { |
| "loadBalancingPolicy": "round_robin", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "foo", |
| "method": "bar" |
| } |
| ], |
| "waitForReady": true |
| } |
| ] |
| } |
| } |
| ]`, |
| `[ |
| { |
| "clientLanguage": [ |
| "CPP", |
| "JAVA" |
| ], |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "percentage": 0, |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "clientHostName": [ |
| "localhost" |
| ], |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "clientLanguage": [ |
| "GO" |
| ], |
| "percentage": 100, |
| "serviceConfig": { |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "foo", |
| "method": "bar" |
| } |
| ], |
| "waitForReady": true, |
| "timeout": "1s", |
| "maxRequestMessageBytes": 1024, |
| "maxResponseMessageBytes": 1024 |
| } |
| ] |
| } |
| }, |
| { |
| "serviceConfig": { |
| "loadBalancingPolicy": "round_robin", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "foo", |
| "method": "bar" |
| } |
| ], |
| "waitForReady": true |
| } |
| ] |
| } |
| } |
| ]`, |
| `[ |
| { |
| "clientLanguage": [ |
| "CPP", |
| "JAVA" |
| ], |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "percentage": 0, |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "clientHostName": [ |
| "localhost" |
| ], |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "clientLanguage": [ |
| "GO" |
| ], |
| "percentage": 100, |
| "serviceConfig": { |
| "loadBalancingPolicy": "round_robin", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "foo" |
| } |
| ], |
| "waitForReady": true, |
| "timeout": "1s" |
| }, |
| { |
| "name": [ |
| { |
| "service": "bar" |
| } |
| ], |
| "waitForReady": false |
| } |
| ] |
| } |
| }, |
| { |
| "serviceConfig": { |
| "loadBalancingPolicy": "round_robin", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "foo", |
| "method": "bar" |
| } |
| ], |
| "waitForReady": true |
| } |
| ] |
| } |
| } |
| ]`, |
| `[ |
| { |
| "clientLanguage": [ |
| "CPP", |
| "JAVA" |
| ], |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "percentage": 0, |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| }, |
| { |
| "clientHostName": [ |
| "localhost" |
| ], |
| "serviceConfig": { |
| "loadBalancingPolicy": "grpclb", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "all" |
| } |
| ], |
| "timeout": "1s" |
| } |
| ] |
| } |
| } |
| ]`, |
| } |
| |
| // scs contains an array of service config string in JSON format. |
| var scs = []string{ |
| `{ |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "method": "bar" |
| } |
| ], |
| "maxRequestMessageBytes": 1024, |
| "maxResponseMessageBytes": 1024 |
| } |
| ] |
| }`, |
| `{ |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "foo", |
| "method": "bar" |
| } |
| ], |
| "waitForReady": true, |
| "timeout": "1s", |
| "maxRequestMessageBytes": 1024, |
| "maxResponseMessageBytes": 1024 |
| } |
| ] |
| }`, |
| `{ |
| "loadBalancingPolicy": "round_robin", |
| "methodConfig": [ |
| { |
| "name": [ |
| { |
| "service": "foo" |
| } |
| ], |
| "waitForReady": true, |
| "timeout": "1s" |
| }, |
| { |
| "name": [ |
| { |
| "service": "bar" |
| } |
| ], |
| "waitForReady": false |
| } |
| ] |
| }`, |
| } |
| |
| // scLookupTbl is a set, which contains targets that have service config. Target |
| // not in this set should not have service config. |
| var scLookupTbl = map[string]bool{ |
| "foo.bar.com": true, |
| "srv.ipv4.single.fake": true, |
| "srv.ipv4.multi.fake": true, |
| "no.attribute": true, |
| } |
| |
| // generateSCF generates a slice of strings (aggregately representing a single |
| // service config file) for the input name, which mocks the result from a real |
| // DNS TXT record lookup. |
| func generateSCF(name string) []string { |
| var b []byte |
| switch name { |
| case "foo.bar.com": |
| b = []byte(scfs[0]) |
| case "srv.ipv4.single.fake": |
| b = []byte(scfs[1]) |
| case "srv.ipv4.multi.fake": |
| b = []byte(scfs[2]) |
| default: |
| b = []byte(scfs[3]) |
| } |
| if name == "no.attribute" { |
| return div(b) |
| } |
| return div(append([]byte(txtAttribute), b...)) |
| } |
| |
| // generateSC returns a service config string in JSON format for the input name. |
| func generateSC(name string) string { |
| _, cnt := scLookupTbl[name] |
| if !cnt || name == "no.attribute" { |
| return "" |
| } |
| switch name { |
| case "foo.bar.com": |
| return scs[0] |
| case "srv.ipv4.single.fake": |
| return scs[1] |
| case "srv.ipv4.multi.fake": |
| return scs[2] |
| default: |
| return "" |
| } |
| } |
| |
| var txtLookupTbl = struct { |
| sync.Mutex |
| tbl map[string][]string |
| }{ |
| tbl: map[string][]string{ |
| "foo.bar.com": generateSCF("foo.bar.com"), |
| "srv.ipv4.single.fake": generateSCF("srv.ipv4.single.fake"), |
| "srv.ipv4.multi.fake": generateSCF("srv.ipv4.multi.fake"), |
| "srv.ipv6.single.fake": generateSCF("srv.ipv6.single.fake"), |
| "srv.ipv6.multi.fake": generateSCF("srv.ipv6.multi.fake"), |
| "no.attribute": generateSCF("no.attribute"), |
| }, |
| } |
| |
| func txtLookup(host string) ([]string, error) { |
| txtLookupTbl.Lock() |
| defer txtLookupTbl.Unlock() |
| if scs, cnt := txtLookupTbl.tbl[host]; cnt { |
| return scs, nil |
| } |
| return nil, fmt.Errorf("failed to lookup TXT:%s resolution in txtLookupTbl", host) |
| } |
| |
| func TestResolve(t *testing.T) { |
| testDNSResolver(t) |
| testDNSResolveNow(t) |
| testIPResolver(t) |
| } |
| |
| func testDNSResolver(t *testing.T) { |
| defer leakcheck.Check(t) |
| tests := []struct { |
| target string |
| addrWant []resolver.Address |
| scWant string |
| }{ |
| { |
| "foo.bar.com", |
| []resolver.Address{{Addr: "1.2.3.4" + colonDefaultPort}, {Addr: "5.6.7.8" + colonDefaultPort}}, |
| generateSC("foo.bar.com"), |
| }, |
| { |
| "foo.bar.com:1234", |
| []resolver.Address{{Addr: "1.2.3.4:1234"}, {Addr: "5.6.7.8:1234"}}, |
| generateSC("foo.bar.com"), |
| }, |
| { |
| "srv.ipv4.single.fake", |
| []resolver.Address{{Addr: "1.2.3.4:1234", Type: resolver.GRPCLB, ServerName: "ipv4.single.fake"}, {Addr: "2.4.6.8" + colonDefaultPort}}, |
| generateSC("srv.ipv4.single.fake"), |
| }, |
| { |
| "srv.ipv4.multi.fake", |
| []resolver.Address{ |
| {Addr: "1.2.3.4:1234", Type: resolver.GRPCLB, ServerName: "ipv4.multi.fake"}, |
| {Addr: "5.6.7.8:1234", Type: resolver.GRPCLB, ServerName: "ipv4.multi.fake"}, |
| {Addr: "9.10.11.12:1234", Type: resolver.GRPCLB, ServerName: "ipv4.multi.fake"}, |
| }, |
| generateSC("srv.ipv4.multi.fake"), |
| }, |
| { |
| "srv.ipv6.single.fake", |
| []resolver.Address{{Addr: "[2607:f8b0:400a:801::1001]:1234", Type: resolver.GRPCLB, ServerName: "ipv6.single.fake"}}, |
| generateSC("srv.ipv6.single.fake"), |
| }, |
| { |
| "srv.ipv6.multi.fake", |
| []resolver.Address{ |
| {Addr: "[2607:f8b0:400a:801::1001]:1234", Type: resolver.GRPCLB, ServerName: "ipv6.multi.fake"}, |
| {Addr: "[2607:f8b0:400a:801::1002]:1234", Type: resolver.GRPCLB, ServerName: "ipv6.multi.fake"}, |
| {Addr: "[2607:f8b0:400a:801::1003]:1234", Type: resolver.GRPCLB, ServerName: "ipv6.multi.fake"}, |
| }, |
| generateSC("srv.ipv6.multi.fake"), |
| }, |
| { |
| "no.attribute", |
| nil, |
| generateSC("no.attribute"), |
| }, |
| } |
| |
| for _, a := range tests { |
| b := NewBuilder() |
| cc := &testClientConn{target: a.target} |
| r, err := b.Build(resolver.Target{Endpoint: a.target}, cc, resolver.BuildOption{}) |
| if err != nil { |
| t.Fatalf("%v\n", err) |
| } |
| var addrs []resolver.Address |
| var cnt int |
| for { |
| addrs, cnt = cc.getAddress() |
| if cnt > 0 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| var sc string |
| for { |
| sc, cnt = cc.getSc() |
| if cnt > 0 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| if !reflect.DeepEqual(a.addrWant, addrs) { |
| t.Errorf("Resolved addresses of target: %q = %+v, want %+v\n", a.target, addrs, a.addrWant) |
| } |
| if !reflect.DeepEqual(a.scWant, sc) { |
| t.Errorf("Resolved service config of target: %q = %+v, want %+v\n", a.target, sc, a.scWant) |
| } |
| r.Close() |
| } |
| } |
| |
| func mutateTbl(target string) func() { |
| hostLookupTbl.Lock() |
| oldHostTblEntry := hostLookupTbl.tbl[target] |
| hostLookupTbl.tbl[target] = hostLookupTbl.tbl[target][:len(oldHostTblEntry)-1] |
| hostLookupTbl.Unlock() |
| txtLookupTbl.Lock() |
| oldTxtTblEntry := txtLookupTbl.tbl[target] |
| txtLookupTbl.tbl[target] = []string{""} |
| txtLookupTbl.Unlock() |
| |
| return func() { |
| hostLookupTbl.Lock() |
| hostLookupTbl.tbl[target] = oldHostTblEntry |
| hostLookupTbl.Unlock() |
| txtLookupTbl.Lock() |
| txtLookupTbl.tbl[target] = oldTxtTblEntry |
| txtLookupTbl.Unlock() |
| } |
| } |
| |
| func testDNSResolveNow(t *testing.T) { |
| defer leakcheck.Check(t) |
| tests := []struct { |
| target string |
| addrWant []resolver.Address |
| addrNext []resolver.Address |
| scWant string |
| scNext string |
| }{ |
| { |
| "foo.bar.com", |
| []resolver.Address{{Addr: "1.2.3.4" + colonDefaultPort}, {Addr: "5.6.7.8" + colonDefaultPort}}, |
| []resolver.Address{{Addr: "1.2.3.4" + colonDefaultPort}}, |
| generateSC("foo.bar.com"), |
| "", |
| }, |
| } |
| |
| for _, a := range tests { |
| b := NewBuilder() |
| cc := &testClientConn{target: a.target} |
| r, err := b.Build(resolver.Target{Endpoint: a.target}, cc, resolver.BuildOption{}) |
| if err != nil { |
| t.Fatalf("%v\n", err) |
| } |
| var addrs []resolver.Address |
| var cnt int |
| for { |
| addrs, cnt = cc.getAddress() |
| if cnt > 0 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| var sc string |
| for { |
| sc, cnt = cc.getSc() |
| if cnt > 0 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| if !reflect.DeepEqual(a.addrWant, addrs) { |
| t.Errorf("Resolved addresses of target: %q = %+v, want %+v\n", a.target, addrs, a.addrWant) |
| } |
| if !reflect.DeepEqual(a.scWant, sc) { |
| t.Errorf("Resolved service config of target: %q = %+v, want %+v\n", a.target, sc, a.scWant) |
| } |
| revertTbl := mutateTbl(a.target) |
| r.ResolveNow(resolver.ResolveNowOption{}) |
| for { |
| addrs, cnt = cc.getAddress() |
| if cnt == 2 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| for { |
| sc, cnt = cc.getSc() |
| if cnt == 2 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| if !reflect.DeepEqual(a.addrNext, addrs) { |
| t.Errorf("Resolved addresses of target: %q = %+v, want %+v\n", a.target, addrs, a.addrNext) |
| } |
| if !reflect.DeepEqual(a.scNext, sc) { |
| t.Errorf("Resolved service config of target: %q = %+v, want %+v\n", a.target, sc, a.scNext) |
| } |
| revertTbl() |
| r.Close() |
| } |
| } |
| |
| const colonDefaultPort = ":" + defaultPort |
| |
| func testIPResolver(t *testing.T) { |
| defer leakcheck.Check(t) |
| tests := []struct { |
| target string |
| want []resolver.Address |
| }{ |
| {"127.0.0.1", []resolver.Address{{Addr: "127.0.0.1" + colonDefaultPort}}}, |
| {"127.0.0.1:12345", []resolver.Address{{Addr: "127.0.0.1:12345"}}}, |
| {"::1", []resolver.Address{{Addr: "[::1]" + colonDefaultPort}}}, |
| {"[::1]:12345", []resolver.Address{{Addr: "[::1]:12345"}}}, |
| {"[::1]", []resolver.Address{{Addr: "[::1]:443"}}}, |
| {"2001:db8:85a3::8a2e:370:7334", []resolver.Address{{Addr: "[2001:db8:85a3::8a2e:370:7334]" + colonDefaultPort}}}, |
| {"[2001:db8:85a3::8a2e:370:7334]", []resolver.Address{{Addr: "[2001:db8:85a3::8a2e:370:7334]" + colonDefaultPort}}}, |
| {"[2001:db8:85a3::8a2e:370:7334]:12345", []resolver.Address{{Addr: "[2001:db8:85a3::8a2e:370:7334]:12345"}}}, |
| {"[2001:db8::1]:http", []resolver.Address{{Addr: "[2001:db8::1]:http"}}}, |
| // TODO(yuxuanli): zone support? |
| } |
| |
| for _, v := range tests { |
| b := NewBuilder() |
| cc := &testClientConn{target: v.target} |
| r, err := b.Build(resolver.Target{Endpoint: v.target}, cc, resolver.BuildOption{}) |
| if err != nil { |
| t.Fatalf("%v\n", err) |
| } |
| var addrs []resolver.Address |
| var cnt int |
| for { |
| addrs, cnt = cc.getAddress() |
| if cnt > 0 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| if !reflect.DeepEqual(v.want, addrs) { |
| t.Errorf("Resolved addresses of target: %q = %+v, want %+v\n", v.target, addrs, v.want) |
| } |
| r.ResolveNow(resolver.ResolveNowOption{}) |
| for { |
| addrs, cnt = cc.getAddress() |
| if cnt == 2 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| if !reflect.DeepEqual(v.want, addrs) { |
| t.Errorf("Resolved addresses of target: %q = %+v, want %+v\n", v.target, addrs, v.want) |
| } |
| r.Close() |
| } |
| } |
| |
| func TestResolveFunc(t *testing.T) { |
| defer leakcheck.Check(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}, |
| {"::", 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}, |
| {"[2001:db8::1]:", errEndsWithColon}, |
| {":", errEndsWithColon}, |
| {"", errMissingAddr}, |
| {"[2001:db8:a0b:12f0::1", fmt.Errorf("invalid target address [2001:db8:a0b:12f0::1, error info: address [2001:db8:a0b:12f0::1:443: missing ']' in address")}, |
| } |
| |
| b := NewBuilder() |
| for _, v := range tests { |
| cc := &testClientConn{target: v.addr} |
| r, err := b.Build(resolver.Target{Endpoint: v.addr}, cc, resolver.BuildOption{}) |
| if err == nil { |
| r.Close() |
| } |
| if !reflect.DeepEqual(err, v.want) { |
| t.Errorf("Build(%q, cc, resolver.BuildOption{}) = %v, want %v", v.addr, err, v.want) |
| } |
| } |
| } |
| |
| func TestDisableServiceConfig(t *testing.T) { |
| defer leakcheck.Check(t) |
| tests := []struct { |
| target string |
| scWant string |
| disableServiceConfig bool |
| }{ |
| { |
| "foo.bar.com", |
| generateSC("foo.bar.com"), |
| false, |
| }, |
| { |
| "foo.bar.com", |
| "", |
| true, |
| }, |
| } |
| |
| for _, a := range tests { |
| b := NewBuilder() |
| cc := &testClientConn{target: a.target} |
| r, err := b.Build(resolver.Target{Endpoint: a.target}, cc, resolver.BuildOption{DisableServiceConfig: a.disableServiceConfig}) |
| if err != nil { |
| t.Fatalf("%v\n", err) |
| } |
| var cnt int |
| var sc string |
| for { |
| sc, cnt = cc.getSc() |
| if cnt > 0 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| if !reflect.DeepEqual(a.scWant, sc) { |
| t.Errorf("Resolved service config of target: %q = %+v, want %+v\n", a.target, sc, a.scWant) |
| } |
| r.Close() |
| } |
| } |
| |
| func TestDNSResolverRetry(t *testing.T) { |
| b := NewBuilder() |
| target := "ipv4.single.fake" |
| cc := &testClientConn{target: target} |
| r, err := b.Build(resolver.Target{Endpoint: target}, cc, resolver.BuildOption{}) |
| if err != nil { |
| t.Fatalf("%v\n", err) |
| } |
| var addrs []resolver.Address |
| for { |
| addrs, _ = cc.getAddress() |
| if len(addrs) == 1 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| want := []resolver.Address{{Addr: "1.2.3.4" + colonDefaultPort}} |
| if !reflect.DeepEqual(want, addrs) { |
| t.Errorf("Resolved addresses of target: %q = %+v, want %+v\n", target, addrs, want) |
| } |
| // mutate the host lookup table so the target has 0 address returned. |
| revertTbl := mutateTbl(target) |
| // trigger a resolve that will get empty address list |
| r.ResolveNow(resolver.ResolveNowOption{}) |
| for { |
| addrs, _ = cc.getAddress() |
| if len(addrs) == 0 { |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| revertTbl() |
| // wait for the retry to happen in two seconds. |
| timer := time.NewTimer(2 * time.Second) |
| for { |
| b := false |
| select { |
| case <-timer.C: |
| b = true |
| default: |
| addrs, _ = cc.getAddress() |
| if len(addrs) == 1 { |
| b = true |
| break |
| } |
| time.Sleep(time.Millisecond) |
| } |
| if b { |
| break |
| } |
| } |
| if !reflect.DeepEqual(want, addrs) { |
| t.Errorf("Resolved addresses of target: %q = %+v, want %+v\n", target, addrs, want) |
| } |
| r.Close() |
| } |
| |
| func TestCustomAuthority(t *testing.T) { |
| defer leakcheck.Check(t) |
| |
| tests := []struct { |
| authority string |
| authorityWant string |
| expectError bool |
| }{ |
| { |
| "4.3.2.1:" + defaultDNSSvrPort, |
| "4.3.2.1:" + defaultDNSSvrPort, |
| false, |
| }, |
| { |
| "4.3.2.1:123", |
| "4.3.2.1:123", |
| false, |
| }, |
| { |
| "4.3.2.1", |
| "4.3.2.1:" + defaultDNSSvrPort, |
| false, |
| }, |
| { |
| "::1", |
| "[::1]:" + defaultDNSSvrPort, |
| false, |
| }, |
| { |
| "[::1]", |
| "[::1]:" + defaultDNSSvrPort, |
| false, |
| }, |
| { |
| "[::1]:123", |
| "[::1]:123", |
| false, |
| }, |
| { |
| "dnsserver.com", |
| "dnsserver.com:" + defaultDNSSvrPort, |
| false, |
| }, |
| { |
| ":123", |
| "localhost:123", |
| false, |
| }, |
| { |
| ":", |
| "", |
| true, |
| }, |
| { |
| "[::1]:", |
| "", |
| true, |
| }, |
| { |
| "dnsserver.com:", |
| "", |
| true, |
| }, |
| } |
| oldCustomAuthorityDialler := customAuthorityDialler |
| defer func() { |
| customAuthorityDialler = oldCustomAuthorityDialler |
| }() |
| |
| for _, a := range tests { |
| errChan := make(chan error, 1) |
| customAuthorityDialler = func(authority string) func(ctx context.Context, network, address string) (net.Conn, error) { |
| if authority != a.authorityWant { |
| errChan <- fmt.Errorf("wrong custom authority passed to resolver. input: %s expected: %s actual: %s", a.authority, a.authorityWant, authority) |
| } else { |
| errChan <- nil |
| } |
| return func(ctx context.Context, network, address string) (net.Conn, error) { |
| return nil, errors.New("no need to dial") |
| } |
| } |
| |
| b := NewBuilder() |
| cc := &testClientConn{target: "foo.bar.com"} |
| r, err := b.Build(resolver.Target{Endpoint: "foo.bar.com", Authority: a.authority}, cc, resolver.BuildOption{}) |
| |
| if err == nil { |
| r.Close() |
| |
| err = <-errChan |
| if err != nil { |
| t.Errorf(err.Error()) |
| } |
| |
| if a.expectError { |
| t.Errorf("custom authority should have caused an error: %s", a.authority) |
| } |
| } else if !a.expectError { |
| t.Errorf("unexpected error using custom authority %s: %s", a.authority, err) |
| } |
| } |
| } |
