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