我正在嘗試將整個(gè)目錄上傳到服務(wù)器。它適用于小目錄，但有 100 多張圖片，它返回“許多打開(kāi)的文件”錯(cuò)誤。我在讀取文件后立即關(guān)閉該文件。知道如何解決這個(gè)問(wèn)題嗎？這是我的代碼 func uploadDir(path string) error { dir, err := os.Open(path) if err != nil { return err } files, err := dir.Readdirnames(-1) if err != nil { return err } dir.Close() errChan := make(chan error) resChan := make(chan *client.PutResult) remaining := len(files) for _, file := range files { file := file go func() { file, err := os.Open(path + "/" + file) if err != nil { errChan <- err } c := client.NewClient(os.Getenv("DROPS_SERVER")) res, err := c.Upload(client.NewUploadHandleFromReader(file)) file.Close() if err != nil { errChan <- err } resChan <- res }() } for { select { case res := <-resChan: log.Println(res) remaining-- case err := <-errChan: if err != nil { return err } } if remaining == 0 { break } } return nil}
2 回答
慕雪6442864
TA貢獻(xiàn)1812條經(jīng)驗(yàn) 獲得超5個(gè)贊
原始代碼不限制活動(dòng) go 例程的數(shù)量，因此不限制打開(kāi)的文件描述符的數(shù)量。一些操作系統(tǒng)對(duì)打開(kāi)的文件描述符的數(shù)量有限制。解決方法是創(chuàng)建固定數(shù)量的工作程序 go 例程。
func uploadDir(path string) error {
// Read directory and close.
dir, err := os.Open(path)
if err != nil {
return err
}
names, err := dir.Readdirnames(-1)
if err != nil {
return err
}
dir.Close()
// Copy names to a channel for workers to consume. Close the
// channel so that workers stop when all work is complete.
namesChan := make(chan string, len(names))
for _, name := range names {
namesChan <- name
}
close(namesChan)
// Create a maximum of 8 workers
workers := 8
if len(names) < workers {
workers = len(names)
}
errChan := make(chan error, 1)
resChan := make(chan *client.PutResult, len(names))
// Run workers
for i := 0; i < workers; i++ {
go func() {
// Consume work from namesChan. Loop will end when no more work.
for name := range namesChan {
file, err := os.Open(filepath.Join(path, name))
if err != nil {
select {
case errChan <- err:
// will break parent goroutine out of loop
default:
// don't care, first error wins
}
return
}
c := client.NewClient(os.Getenv("DROPS_SERVER"))
res, err := c.Upload(client.NewUploadHandleFromReader(file))
file.Close()
if err != nil {
select {
case errChan <- err:
// will break parent goroutine out of loop
default:
// don't care, first error wins
}
return
}
resChan <- res
}
}()
}
// Collect results from workers
for i := 0; i < len(names); i++ {
select {
case res := <-resChan:
log.Println(res)
case err := <-errChan:
return err
}
}
return nil
}
作為獎(jiǎng)勵(lì)，我修改了通道大小并發(fā)送操作，以便在出現(xiàn)錯(cuò)誤時(shí)不會(huì)卡住 goroutine。
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