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// Copyright 2015 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 transport/grpc supports network connections to GRPC servers.
// This package is not intended for use by end developers. Use the
// google.golang.org/api/option package to configure API clients.
package grpc
import (
"errors"
"golang.org/x/net/context"
"google.golang.org/api/internal"
"google.golang.org/api/option"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/oauth"
)
// Set at init time by dial_appengine.go. If nil, we're not on App Engine.
var appengineDialerHook func(context.Context) grpc.DialOption
// Dial returns a GRPC connection for use communicating with a Google cloud
// service, configured with the given ClientOptions.
func Dial(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, error) {
return dial(ctx, false, opts)
}
// DialInsecure returns an insecure GRPC connection for use communicating
// with fake or mock Google cloud service implementations, such as emulators.
// The connection is configured with the given ClientOptions.
func DialInsecure(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, error) {
return dial(ctx, true, opts)
}
func dial(ctx context.Context, insecure bool, opts []option.ClientOption) (*grpc.ClientConn, error) {
var o internal.DialSettings
for _, opt := range opts {
opt.Apply(&o)
}
if err := o.Validate(); err != nil {
return nil, err
}
if o.HTTPClient != nil {
return nil, errors.New("unsupported HTTP client specified")
}
if o.GRPCConn != nil {
return o.GRPCConn, nil
}
var grpcOpts []grpc.DialOption
if insecure {
grpcOpts = []grpc.DialOption{grpc.WithInsecure()}
} else if !o.NoAuth {
creds, err := internal.Creds(ctx, &o)
if err != nil {
return nil, err
}
grpcOpts = []grpc.DialOption{
grpc.WithPerRPCCredentials(oauth.TokenSource{creds.TokenSource}),
grpc.WithTransportCredentials(credentials.NewClientTLSFromCert(nil, "")),
}
}
if appengineDialerHook != nil {
// Use the Socket API on App Engine.
grpcOpts = append(grpcOpts, appengineDialerHook(ctx))
}
// Add tracing, but before the other options, so that clients can override the
// gRPC stats handler.
// This assumes that gRPC options are processed in order, left to right.
grpcOpts = addOCStatsHandler(grpcOpts)
grpcOpts = append(grpcOpts, o.GRPCDialOpts...)
if o.UserAgent != "" {
grpcOpts = append(grpcOpts, grpc.WithUserAgent(o.UserAgent))
}
return grpc.DialContext(ctx, o.Endpoint, grpcOpts...)
}
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