嘗試使用 go 發(fā)布多部分/表單數(shù)據(jù)圖像圖像文件從請(qǐng)求客戶端接收，并且已另存為多部分。文件這是我的代碼func postImage(file multipart.File, url string, filename string) (*http.Response, error) { r, w := io.Pipe() defer w.Close() m := multipart.NewWriter(w) defer m.Close() errchan := make(chan error) defer close(errchan) go func() { part, err := m.CreateFormFile("file", filename) log.Println(err) if err != nil { errchan <- err return } if _, err := io.Copy(part, file); err != nil { errchan <- err return } }() merr := <-errchan if merr != nil { return nil, merr } resp, err := http.Post(url, m.FormDataContentType(), r) if err != nil { return nil, err } defer resp.Body.Close() return resp, err}當(dāng)我嘗試使用它時(shí)，它卡在永遠(yuǎn)不會(huì)返回任何東西part, err := m.CreateFormFile("file", filename)任何解決方案？
1 回答
湖上湖
TA貢獻(xiàn)2003條經(jīng)驗(yàn) 獲得超2個(gè)贊
使用管道錯(cuò)誤將錯(cuò)誤傳播回主 goroutine。關(guān)閉管道的寫(xiě)入端，以防止客戶端在讀取時(shí)永久阻塞。關(guān)閉管道的讀取側(cè)，以確保 goroutine 退出。
func postImage(file multipart.File, url string, filename string) (*http.Response, error) {
r, w := io.Pipe()
// Close the read side of the pipe to ensure that
// the goroutine exits in the case where http.Post
// does not read all of the request body.
defer r.Close()
m := multipart.NewWriter(w)
go func() {
part, err := m.CreateFormFile("file", filename)
if err != nil {
// The error is returned from read on the pipe.
w.CloseWithError(err)
return
}
if _, err := io.Copy(part, file); err != nil {
// The error is returned from read on the pipe.
w.CloseWithError(err)
return
}
// The http.Post function reads the pipe until
// an error or EOF. Close to return an EOF to
// http.Post.
w.Close()
}()
resp, err := http.Post(url, m.FormDataContentType(), r)
if err != nil {
return nil, err
}
defer resp.Body.Close()
return resp, err
}
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