mirror of https://github.com/grpc/grpc-go.git
94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
/*
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*
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* Copyright 2023 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 grpc
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import (
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"context"
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"fmt"
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"net"
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"testing"
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"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/resolver"
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)
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type wrapResolverBuilder struct {
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resolver.Builder
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scheme string
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}
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func (w *wrapResolverBuilder) Scheme() string {
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return w.scheme
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}
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func init() {
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resolver.Register(&wrapResolverBuilder{Builder: resolver.Get("passthrough"), scheme: "casetest"})
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resolver.Register(&wrapResolverBuilder{Builder: resolver.Get("dns"), scheme: "caseTest"})
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}
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func (s) TestResolverCaseSensitivity(t *testing.T) {
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// This should find the "casetest" resolver instead of the "caseTest"
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// resolver, even though the latter was registered later. "casetest" is
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// "passthrough" and "caseTest" is "dns". With "passthrough" the dialer
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// should see the target's address directly, but "dns" would be converted
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// into a loopback IP (v4 or v6) address.
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target := "caseTest:///localhost:1234"
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addrCh := make(chan string, 1)
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customDialer := func(ctx context.Context, addr string) (net.Conn, error) {
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select {
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case addrCh <- addr:
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default:
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}
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return nil, fmt.Errorf("not dialing with custom dialer")
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}
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cc, err := Dial(target, WithContextDialer(customDialer), WithTransportCredentials(insecure.NewCredentials()))
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if err != nil {
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t.Fatalf("Unexpected Dial(%q) error: %v", target, err)
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}
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cc.Connect()
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if got, want := <-addrCh, "localhost:1234"; got != want {
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cc.Close()
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t.Fatalf("Dialer got address %q; wanted %q", got, want)
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}
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cc.Close()
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// Clear addrCh for future use.
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select {
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case <-addrCh:
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default:
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}
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res := &wrapResolverBuilder{Builder: resolver.Get("dns"), scheme: "caseTest2"}
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// This should not find the injected resolver due to the case not matching.
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// This results in "passthrough" being used with the address as the whole
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// target.
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target = "caseTest2:///localhost:1234"
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cc, err = Dial(target, WithContextDialer(customDialer), WithResolvers(res), WithTransportCredentials(insecure.NewCredentials()))
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if err != nil {
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t.Fatalf("Unexpected Dial(%q) error: %v", target, err)
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}
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cc.Connect()
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if got, want := <-addrCh, target; got != want {
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cc.Close()
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t.Fatalf("Dialer got address %q; wanted %q", got, want)
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}
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cc.Close()
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}
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