--- /dev/null
+/*
+ *
+ * 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 dns
+
+import (
+ "fmt"
+ "net"
+ "os"
+ "reflect"
+ "sync"
+ "testing"
+ "time"
+
+ "google.golang.org/grpc/resolver"
+ "google.golang.org/grpc/test/leakcheck"
+)
+
+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
+ 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
+}
+
+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},
+ {"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", errForInvalidTarget},
+ }
+
+ 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)
+ }
+ }
+}
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