Method TestResolverCaseSensitivity

resolver_test.go:50–98

(t *testing.T)

}

func (s) TestResolverCaseSensitivity(t *testing.T) {
	// This should find the "casetest" resolver instead of the "caseTest"
	// resolver, even though the latter was registered later.  "casetest" is
	// "passthrough" and "caseTest" is "dns".  With "passthrough" the dialer
	// should see the target's address directly, but "dns" would be converted
	// into a loopback IP (v4 or v6) address.
	target := "caseTest:///localhost:1234"
	addrCh := make(chan string, 1)
	customDialer := func(_ context.Context, addr string) (net.Conn, error) {
		select {
		case addrCh <- addr:
		default:
		}
		return nil, fmt.Errorf("not dialing with custom dialer")
	}

	cc, err := NewClient(target, WithContextDialer(customDialer), WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		t.Fatalf("Unexpected NewClient(%q) error: %v", target, err)
	}
	cc.Connect()
	if got, want := <-addrCh, "localhost:1234"; got != want {
		cc.Close()
		t.Fatalf("Dialer got address %q; wanted %q", got, want)
	}
	cc.Close()

	// Clear addrCh for future use.
	select {
	case <-addrCh:
	default:
	}

	res := &wrapResolverBuilder{Builder: resolver.Get("dns"), scheme: "caseTest2"}
	// This should not find the injected resolver due to the case not matching.
	// This results in "passthrough" being used with the address as the whole
	// target.
	target = "caseTest2:///localhost:1234"
	cc, err = NewClient(target, WithContextDialer(customDialer), withDefaultScheme("passthrough"), WithResolvers(res), WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		t.Fatalf("Unexpected NewClient(%q) error: %v", target, err)
	}
	cc.Connect()
	if got, want := <-addrCh, target; got != want {
		cc.Close()
		t.Fatalf("Dialer got address %q; wanted %q", got, want)
	}
	cc.Close()
}

// TestResolverAddressesToEndpoints ensures one Endpoint is created for each
// entry in resolver.State.Addresses automatically.