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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 cloud
import (
"net/http"
"golang.org/x/oauth2"
"google.golang.org/cloud/internal/opts"
"google.golang.org/grpc"
)
// ClientOption is used when construct clients for each cloud service.
type ClientOption interface {
// Resolve configures the given DialOpts for this option.
Resolve(*opts.DialOpt)
}
// WithTokenSource returns a ClientOption that specifies an OAuth2 token
// source to be used as the basis for authentication.
func WithTokenSource(s oauth2.TokenSource) ClientOption {
return withTokenSource{s}
}
type withTokenSource struct{ ts oauth2.TokenSource }
func (w withTokenSource) Resolve(o *opts.DialOpt) {
o.TokenSource = w.ts
}
// WithEndpoint returns a ClientOption that overrides the default endpoint
// to be used for a service.
func WithEndpoint(url string) ClientOption {
return withEndpoint(url)
}
type withEndpoint string
func (w withEndpoint) Resolve(o *opts.DialOpt) {
o.Endpoint = string(w)
}
// WithScopes returns a ClientOption that overrides the default OAuth2 scopes
// to be used for a service.
func WithScopes(scope ...string) ClientOption {
return withScopes(scope)
}
type withScopes []string
func (w withScopes) Resolve(o *opts.DialOpt) {
s := make([]string, len(w))
copy(s, w)
o.Scopes = s
}
// WithUserAgent returns a ClientOption that sets the User-Agent.
func WithUserAgent(ua string) ClientOption {
return withUA(ua)
}
type withUA string
func (w withUA) Resolve(o *opts.DialOpt) { o.UserAgent = string(w) }
// WithBaseHTTP returns a ClientOption that specifies the HTTP client to
// use as the basis of communications. This option may only be used with
// services that support HTTP as their communication transport.
func WithBaseHTTP(client *http.Client) ClientOption {
return withBaseHTTP{client}
}
type withBaseHTTP struct{ client *http.Client }
func (w withBaseHTTP) Resolve(o *opts.DialOpt) {
o.HTTPClient = w.client
}
// WithBaseGRPC returns a ClientOption that specifies the gRPC client
// connection to use as the basis of communications. This option many only be
// used with services that support gRPC as their communication transport.
func WithBaseGRPC(client *grpc.ClientConn) ClientOption {
return withBaseGRPC{client}
}
type withBaseGRPC struct{ client *grpc.ClientConn }
func (w withBaseGRPC) Resolve(o *opts.DialOpt) {
o.GRPCClient = w.client
}
// WithGRPCDialOption returns a ClientOption that appends a new grpc.DialOption
// to an underlying gRPC dial. It does not work with WithBaseGRPC.
func WithGRPCDialOption(opt grpc.DialOption) ClientOption {
return withGRPCDialOption{opt}
}
type withGRPCDialOption struct{ opt grpc.DialOption }
func (w withGRPCDialOption) Resolve(o *opts.DialOpt) {
o.GRPCDialOpts = append(o.GRPCDialOpts, w.opt)
}
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