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124 lines
3.5 KiB
Go
124 lines
3.5 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package gensupport
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import (
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"context"
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"encoding/json"
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"errors"
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"net/http"
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"time"
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)
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// SendRequest sends a single HTTP request using the given client.
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// If ctx is non-nil, it calls all hooks, then sends the request with
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// req.WithContext, then calls any functions returned by the hooks in
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// reverse order.
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func SendRequest(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
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// Disallow Accept-Encoding because it interferes with the automatic gzip handling
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// done by the default http.Transport. See https://github.com/google/google-api-go-client/issues/219.
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if _, ok := req.Header["Accept-Encoding"]; ok {
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return nil, errors.New("google api: custom Accept-Encoding headers not allowed")
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}
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if ctx == nil {
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return client.Do(req)
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}
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return send(ctx, client, req)
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}
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func send(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
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if client == nil {
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client = http.DefaultClient
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}
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resp, err := client.Do(req.WithContext(ctx))
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// If we got an error, and the context has been canceled,
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// the context's error is probably more useful.
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if err != nil {
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select {
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case <-ctx.Done():
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err = ctx.Err()
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default:
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}
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}
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return resp, err
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}
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// SendRequestWithRetry sends a single HTTP request using the given client,
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// with retries if a retryable error is returned.
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// If ctx is non-nil, it calls all hooks, then sends the request with
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// req.WithContext, then calls any functions returned by the hooks in
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// reverse order.
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func SendRequestWithRetry(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
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// Disallow Accept-Encoding because it interferes with the automatic gzip handling
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// done by the default http.Transport. See https://github.com/google/google-api-go-client/issues/219.
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if _, ok := req.Header["Accept-Encoding"]; ok {
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return nil, errors.New("google api: custom Accept-Encoding headers not allowed")
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}
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if ctx == nil {
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return client.Do(req)
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}
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return sendAndRetry(ctx, client, req)
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}
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func sendAndRetry(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
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if client == nil {
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client = http.DefaultClient
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}
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var resp *http.Response
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var err error
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// Loop to retry the request, up to the context deadline.
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var pause time.Duration
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bo := backoff()
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for {
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select {
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case <-ctx.Done():
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// If we got an error, and the context has been canceled,
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// the context's error is probably more useful.
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if err == nil {
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err = ctx.Err()
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}
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return resp, err
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case <-time.After(pause):
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}
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resp, err = client.Do(req.WithContext(ctx))
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var status int
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if resp != nil {
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status = resp.StatusCode
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}
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// Check if we can retry the request. A retry can only be done if the error
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// is retryable and the request body can be re-created using GetBody (this
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// will not be possible if the body was unbuffered).
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if req.GetBody == nil || !shouldRetry(status, err) {
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break
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}
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var errBody error
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req.Body, errBody = req.GetBody()
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if errBody != nil {
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break
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}
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pause = bo.Pause()
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if resp != nil && resp.Body != nil {
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resp.Body.Close()
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}
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}
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return resp, err
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}
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// DecodeResponse decodes the body of res into target. If there is no body,
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// target is unchanged.
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func DecodeResponse(target interface{}, res *http.Response) error {
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if res.StatusCode == http.StatusNoContent {
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return nil
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}
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return json.NewDecoder(res.Body).Decode(target)
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}
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