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authorNathan Dench <ndenc2@gmail.com>2019-05-24 15:16:44 +1000
committerNathan Dench <ndenc2@gmail.com>2019-05-24 15:16:44 +1000
commit107c1cdb09c575aa2f61d97f48d8587eb6bada4c (patch)
treeca7d008643efc555c388baeaf1d986e0b6b3e28c /vendor/google.golang.org/api/gensupport/send.go
parent844b5a68d8af4791755b8f0ad293cc99f5959183 (diff)
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Upgrade to 0.12
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1 files changed, 87 insertions, 0 deletions
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1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package gensupport
6
7import (
8 "context"
9 "encoding/json"
10 "errors"
11 "net/http"
12)
13
14// Hook is the type of a function that is called once before each HTTP request
15// that is sent by a generated API. It returns a function that is called after
16// the request returns.
17// Hooks are not called if the context is nil.
18type Hook func(ctx context.Context, req *http.Request) func(resp *http.Response)
19
20var hooks []Hook
21
22// RegisterHook registers a Hook to be called before each HTTP request by a
23// generated API. Hooks are called in the order they are registered. Each
24// hook can return a function; if it is non-nil, it is called after the HTTP
25// request returns. These functions are called in the reverse order.
26// RegisterHook should not be called concurrently with itself or SendRequest.
27func RegisterHook(h Hook) {
28 hooks = append(hooks, h)
29}
30
31// SendRequest sends a single HTTP request using the given client.
32// If ctx is non-nil, it calls all hooks, then sends the request with
33// req.WithContext, then calls any functions returned by the hooks in
34// reverse order.
35func SendRequest(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
36 // Disallow Accept-Encoding because it interferes with the automatic gzip handling
37 // done by the default http.Transport. See https://github.com/google/google-api-go-client/issues/219.
38 if _, ok := req.Header["Accept-Encoding"]; ok {
39 return nil, errors.New("google api: custom Accept-Encoding headers not allowed")
40 }
41 if ctx == nil {
42 return client.Do(req)
43 }
44 // Call hooks in order of registration, store returned funcs.
45 post := make([]func(resp *http.Response), len(hooks))
46 for i, h := range hooks {
47 fn := h(ctx, req)
48 post[i] = fn
49 }
50
51 // Send request.
52 resp, err := send(ctx, client, req)
53
54 // Call returned funcs in reverse order.
55 for i := len(post) - 1; i >= 0; i-- {
56 if fn := post[i]; fn != nil {
57 fn(resp)
58 }
59 }
60 return resp, err
61}
62
63func send(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
64 if client == nil {
65 client = http.DefaultClient
66 }
67 resp, err := client.Do(req.WithContext(ctx))
68 // If we got an error, and the context has been canceled,
69 // the context's error is probably more useful.
70 if err != nil {
71 select {
72 case <-ctx.Done():
73 err = ctx.Err()
74 default:
75 }
76 }
77 return resp, err
78}
79
80// DecodeResponse decodes the body of res into target. If there is no body,
81// target is unchanged.
82func DecodeResponse(target interface{}, res *http.Response) error {
83 if res.StatusCode == http.StatusNoContent {
84 return nil
85 }
86 return json.NewDecoder(res.Body).Decode(target)
87}