| // Copyright 2016 Google LLC |
| // |
| // 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 grpc |
| |
| import ( |
| "context" |
| "errors" |
| "net" |
| "testing" |
| "time" |
| |
| "golang.org/x/oauth2" |
| "google.golang.org/api/option" |
| "google.golang.org/grpc" |
| ) |
| |
| // Check that user optioned grpc.WithDialer option overrides the App Engine hook. |
| func TestGRPCHook(t *testing.T) { |
| ctx, cancel := context.WithTimeout(context.Background(), 10*time.Millisecond) |
| expected := false |
| |
| appengineDialerHook = (func(ctx context.Context) grpc.DialOption { |
| return grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) { |
| t.Error("did not expect a call to notExpected dialer, got one") |
| cancel() |
| return nil, errors.New("not expected") |
| }) |
| }) |
| defer func() { |
| appengineDialerHook = nil |
| }() |
| |
| expectedDialer := grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) { |
| expected = true |
| cancel() |
| return nil, errors.New("expected") |
| }) |
| |
| conn, err := Dial(ctx, |
| option.WithTokenSource(oauth2.StaticTokenSource(nil)), // No creds. |
| option.WithGRPCDialOption(expectedDialer), |
| option.WithEndpoint("example.google.com:443")) |
| if err != nil { |
| t.Errorf("DialGRPC: error %v, want nil", err) |
| } |
| |
| // gRPC doesn't connect before the first call. |
| grpc.Invoke(ctx, "foo", nil, nil, conn) |
| conn.Close() |
| |
| if !expected { |
| t.Error("expected a call to expected dialer, didn't get one") |
| } |
| } |