77 lines
2.4 KiB
Go
77 lines
2.4 KiB
Go
// Copyright 2018 The Go Cloud Development Kit Authors
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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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// https://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 useragent includes constants and utilitiesfor setting the User-Agent
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// for Go CDK connections to GCP.
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package useragent // import "gocloud.dev/internal/useragent"
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import (
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"fmt"
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"net/http"
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"google.golang.org/api/option"
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"google.golang.org/grpc"
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)
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const (
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prefix = "go-cloud"
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version = "0.1.0"
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)
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// ClientOption returns an option.ClientOption that sets a Go CDK User-Agent.
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func ClientOption(api string) option.ClientOption {
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return option.WithUserAgent(userAgentString(api))
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}
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// GRPCDialOption returns a grpc.DialOption that sets a Go CDK User-Agent.
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func GRPCDialOption(api string) grpc.DialOption {
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return grpc.WithUserAgent(userAgentString(api))
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}
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// AzureUserAgentPrefix returns a prefix that is used to set Azure SDK User-Agent to help with diagnostics.
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func AzureUserAgentPrefix(api string) string {
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return userAgentString(api)
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}
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func userAgentString(api string) string {
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return fmt.Sprintf("%s/%s/%s", prefix, api, version)
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}
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// userAgentTransport wraps an http.RoundTripper, adding a User-Agent header
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// to each request.
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type userAgentTransport struct {
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base http.RoundTripper
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api string
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}
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func (t *userAgentTransport) RoundTrip(req *http.Request) (*http.Response, error) {
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// Clone the request to avoid mutating it.
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newReq := *req
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newReq.Header = make(http.Header)
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for k, vv := range req.Header {
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newReq.Header[k] = vv
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}
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// Append to the User-Agent string to preserve other information.
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newReq.Header.Set("User-Agent", req.UserAgent()+" "+userAgentString(t.api))
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return t.base.RoundTrip(&newReq)
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}
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// HTTPClient wraps client and appends a Go CDK string to the User-Agent
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// header for all requests.
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func HTTPClient(client *http.Client, api string) *http.Client {
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c := *client
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c.Transport = &userAgentTransport{base: c.Transport, api: api}
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return &c
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}
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