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