David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 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 | |
| 5 | // +build go1.7 |
| 6 | |
| 7 | // Package ctxhttp provides helper functions for performing context-aware HTTP requests. |
| 8 | package ctxhttp // import "golang.org/x/net/context/ctxhttp" |
| 9 | |
| 10 | import ( |
| 11 | "io" |
| 12 | "net/http" |
| 13 | "net/url" |
| 14 | "strings" |
| 15 | |
| 16 | "golang.org/x/net/context" |
| 17 | ) |
| 18 | |
| 19 | // Do sends an HTTP request with the provided http.Client and returns |
| 20 | // an HTTP response. |
| 21 | // |
| 22 | // If the client is nil, http.DefaultClient is used. |
| 23 | // |
| 24 | // The provided ctx must be non-nil. If it is canceled or times out, |
| 25 | // ctx.Err() will be returned. |
| 26 | func Do(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) { |
| 27 | if client == nil { |
| 28 | client = http.DefaultClient |
| 29 | } |
| 30 | resp, err := client.Do(req.WithContext(ctx)) |
| 31 | // If we got an error, and the context has been canceled, |
| 32 | // the context's error is probably more useful. |
| 33 | if err != nil { |
| 34 | select { |
| 35 | case <-ctx.Done(): |
| 36 | err = ctx.Err() |
| 37 | default: |
| 38 | } |
| 39 | } |
| 40 | return resp, err |
| 41 | } |
| 42 | |
| 43 | // Get issues a GET request via the Do function. |
| 44 | func Get(ctx context.Context, client *http.Client, url string) (*http.Response, error) { |
| 45 | req, err := http.NewRequest("GET", url, nil) |
| 46 | if err != nil { |
| 47 | return nil, err |
| 48 | } |
| 49 | return Do(ctx, client, req) |
| 50 | } |
| 51 | |
| 52 | // Head issues a HEAD request via the Do function. |
| 53 | func Head(ctx context.Context, client *http.Client, url string) (*http.Response, error) { |
| 54 | req, err := http.NewRequest("HEAD", url, nil) |
| 55 | if err != nil { |
| 56 | return nil, err |
| 57 | } |
| 58 | return Do(ctx, client, req) |
| 59 | } |
| 60 | |
| 61 | // Post issues a POST request via the Do function. |
| 62 | func Post(ctx context.Context, client *http.Client, url string, bodyType string, body io.Reader) (*http.Response, error) { |
| 63 | req, err := http.NewRequest("POST", url, body) |
| 64 | if err != nil { |
| 65 | return nil, err |
| 66 | } |
| 67 | req.Header.Set("Content-Type", bodyType) |
| 68 | return Do(ctx, client, req) |
| 69 | } |
| 70 | |
| 71 | // PostForm issues a POST request via the Do function. |
| 72 | func PostForm(ctx context.Context, client *http.Client, url string, data url.Values) (*http.Response, error) { |
| 73 | return Post(ctx, client, url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode())) |
| 74 | } |