100 lines
2.9 KiB
Go
100 lines
2.9 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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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 cloud
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import (
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"net/http"
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"golang.org/x/oauth2"
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"google.golang.org/cloud/internal/opts"
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"google.golang.org/grpc"
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)
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// ClientOption is used when construct clients for each cloud service.
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type ClientOption interface {
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// Resolve configures the given DialOpts for this option.
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Resolve(*opts.DialOpt)
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}
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// WithTokenSource returns a ClientOption that specifies an OAuth2 token
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// source to be used as the basis for authentication.
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func WithTokenSource(s oauth2.TokenSource) ClientOption {
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return withTokenSource{s}
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}
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type withTokenSource struct{ ts oauth2.TokenSource }
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func (w withTokenSource) Resolve(o *opts.DialOpt) {
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o.TokenSource = w.ts
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}
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// WithEndpoint returns a ClientOption that overrides the default endpoint
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// to be used for a service.
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func WithEndpoint(url string) ClientOption {
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return withEndpoint(url)
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}
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type withEndpoint string
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func (w withEndpoint) Resolve(o *opts.DialOpt) {
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o.Endpoint = string(w)
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}
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// WithScopes returns a ClientOption that overrides the default OAuth2 scopes
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// to be used for a service.
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func WithScopes(scope ...string) ClientOption {
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return withScopes(scope)
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}
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type withScopes []string
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func (w withScopes) Resolve(o *opts.DialOpt) {
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o.Scopes = []string(w)
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}
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// WithUserAgent returns a ClientOption that sets the User-Agent.
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func WithUserAgent(ua string) ClientOption {
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return withUA(ua)
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}
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type withUA string
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func (w withUA) Resolve(o *opts.DialOpt) { o.UserAgent = string(w) }
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// WithBaseHTTP returns a ClientOption that specifies the HTTP client to
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// use as the basis of communications. This option may only be used with
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// services that support HTTP as their communication transport.
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func WithBaseHTTP(client *http.Client) ClientOption {
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return withBaseHTTP{client}
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}
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type withBaseHTTP struct{ client *http.Client }
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func (w withBaseHTTP) Resolve(o *opts.DialOpt) {
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o.HTTPClient = w.client
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}
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// WithBaseGRPC returns a ClientOption that specifies the GRPC client
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// connection to use as the basis of communications. This option many only be
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// used with services that support HRPC as their communication transport.
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func WithBaseGRPC(client *grpc.ClientConn) ClientOption {
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return withBaseGRPC{client}
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}
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type withBaseGRPC struct{ client *grpc.ClientConn }
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func (w withBaseGRPC) Resolve(o *opts.DialOpt) {
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o.GRPCClient = w.client
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}
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