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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
import (
"errors"
"fmt"
"net/http"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/cloud"
"google.golang.org/cloud/internal/opts"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/oauth"
)
// ErrHTTP is returned when on a non-200 HTTP response.
type ErrHTTP struct {
StatusCode int
Body []byte
err error
}
func (e *ErrHTTP) Error() string {
if e.err == nil {
return fmt.Sprintf("error during call, http status code: %v %s", e.StatusCode, e.Body)
}
return e.err.Error()
}
// NewHTTPClient returns an HTTP client for use communicating with a Google cloud
// service, configured with the given ClientOptions. It also returns the endpoint
// for the service as specified in the options.
func NewHTTPClient(ctx context.Context, opt ...cloud.ClientOption) (*http.Client, string, error) {
var o opts.DialOpt
for _, opt := range opt {
opt.Resolve(&o)
}
if o.GRPCClient != nil {
return nil, "", errors.New("unsupported GRPC base transport specified")
}
// TODO(djd): Wrap all http.Clients with appropriate internal version to add
// UserAgent header and prepend correct endpoint.
if o.HTTPClient != nil {
return o.HTTPClient, o.Endpoint, nil
}
if o.TokenSource == nil {
var err error
o.TokenSource, err = google.DefaultTokenSource(ctx, o.Scopes...)
if err != nil {
return nil, "", fmt.Errorf("google.DefaultTokenSource: %v", err)
}
}
return oauth2.NewClient(ctx, o.TokenSource), o.Endpoint, nil
}
// DialGRPC returns a GRPC connection for use communicating with a Google cloud
// service, configured with the given ClientOptions.
func DialGRPC(ctx context.Context, opt ...cloud.ClientOption) (*grpc.ClientConn, error) {
var o opts.DialOpt
for _, opt := range opt {
opt.Resolve(&o)
}
if o.HTTPClient != nil {
return nil, errors.New("unsupported HTTP base transport specified")
}
if o.GRPCClient != nil {
return o.GRPCClient, nil
}
if o.TokenSource == nil {
var err error
o.TokenSource, err = google.DefaultTokenSource(ctx, o.Scopes...)
if err != nil {
return nil, fmt.Errorf("google.DefaultTokenSource: %v", err)
}
}
grpcOpts := []grpc.DialOption{
grpc.WithPerRPCCredentials(oauth.TokenSource{o.TokenSource}),
grpc.WithTransportCredentials(credentials.NewClientTLSFromCert(nil, "")),
}
grpcOpts = append(grpcOpts, o.GRPCDialOpts...)
if o.UserAgent != "" {
grpcOpts = append(grpcOpts, grpc.WithUserAgent(o.UserAgent))
}
return grpc.Dial(o.Endpoint, grpcOpts...)
}
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