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// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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 (
"errors"
"net"
"testing"
"time"
"golang.org/x/net/context"
"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")
}
}
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