145 lines
3.6 KiB
Go
145 lines
3.6 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package ctxhttp provides helper functions for performing context-aware HTTP requests.
|
|
package ctxhttp // import "golang.org/x/net/context/ctxhttp"
|
|
|
|
import (
|
|
"io"
|
|
"net/http"
|
|
"net/url"
|
|
"strings"
|
|
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
func nop() {}
|
|
|
|
var (
|
|
testHookContextDoneBeforeHeaders = nop
|
|
testHookDoReturned = nop
|
|
testHookDidBodyClose = nop
|
|
)
|
|
|
|
// Do sends an HTTP request with the provided http.Client and returns an HTTP response.
|
|
// If the client is nil, http.DefaultClient is used.
|
|
// If the context is canceled or times out, ctx.Err() will be returned.
|
|
func Do(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
|
|
if client == nil {
|
|
client = http.DefaultClient
|
|
}
|
|
|
|
// Request cancelation changed in Go 1.5, see cancelreq.go and cancelreq_go14.go.
|
|
cancel := canceler(client, req)
|
|
|
|
type responseAndError struct {
|
|
resp *http.Response
|
|
err error
|
|
}
|
|
result := make(chan responseAndError, 1)
|
|
|
|
// Make local copies of test hooks closed over by goroutines below.
|
|
// Prevents data races in tests.
|
|
testHookDoReturned := testHookDoReturned
|
|
testHookDidBodyClose := testHookDidBodyClose
|
|
|
|
go func() {
|
|
resp, err := client.Do(req)
|
|
testHookDoReturned()
|
|
result <- responseAndError{resp, err}
|
|
}()
|
|
|
|
var resp *http.Response
|
|
|
|
select {
|
|
case <-ctx.Done():
|
|
testHookContextDoneBeforeHeaders()
|
|
cancel()
|
|
// Clean up after the goroutine calling client.Do:
|
|
go func() {
|
|
if r := <-result; r.resp != nil {
|
|
testHookDidBodyClose()
|
|
r.resp.Body.Close()
|
|
}
|
|
}()
|
|
return nil, ctx.Err()
|
|
case r := <-result:
|
|
var err error
|
|
resp, err = r.resp, r.err
|
|
if err != nil {
|
|
return resp, err
|
|
}
|
|
}
|
|
|
|
c := make(chan struct{})
|
|
go func() {
|
|
select {
|
|
case <-ctx.Done():
|
|
cancel()
|
|
case <-c:
|
|
// The response's Body is closed.
|
|
}
|
|
}()
|
|
resp.Body = ¬ifyingReader{resp.Body, c}
|
|
|
|
return resp, nil
|
|
}
|
|
|
|
// Get issues a GET request via the Do function.
|
|
func Get(ctx context.Context, client *http.Client, url string) (*http.Response, error) {
|
|
req, err := http.NewRequest("GET", url, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return Do(ctx, client, req)
|
|
}
|
|
|
|
// Head issues a HEAD request via the Do function.
|
|
func Head(ctx context.Context, client *http.Client, url string) (*http.Response, error) {
|
|
req, err := http.NewRequest("HEAD", url, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return Do(ctx, client, req)
|
|
}
|
|
|
|
// Post issues a POST request via the Do function.
|
|
func Post(ctx context.Context, client *http.Client, url string, bodyType string, body io.Reader) (*http.Response, error) {
|
|
req, err := http.NewRequest("POST", url, body)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
req.Header.Set("Content-Type", bodyType)
|
|
return Do(ctx, client, req)
|
|
}
|
|
|
|
// PostForm issues a POST request via the Do function.
|
|
func PostForm(ctx context.Context, client *http.Client, url string, data url.Values) (*http.Response, error) {
|
|
return Post(ctx, client, url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
|
|
}
|
|
|
|
// notifyingReader is an io.ReadCloser that closes the notify channel after
|
|
// Close is called or a Read fails on the underlying ReadCloser.
|
|
type notifyingReader struct {
|
|
io.ReadCloser
|
|
notify chan<- struct{}
|
|
}
|
|
|
|
func (r *notifyingReader) Read(p []byte) (int, error) {
|
|
n, err := r.ReadCloser.Read(p)
|
|
if err != nil && r.notify != nil {
|
|
close(r.notify)
|
|
r.notify = nil
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (r *notifyingReader) Close() error {
|
|
err := r.ReadCloser.Close()
|
|
if r.notify != nil {
|
|
close(r.notify)
|
|
r.notify = nil
|
|
}
|
|
return err
|
|
}
|