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TA贡献1876条经验 获得超6个赞
最好在函数中处理上下文,这样就可以将其用作 中的同步函数。makeHTTPRequest()main()
https://play.golang.org/p/Bhl4qprIBgH
func makeHTTPRequest(ctx context.Context) (string, error) {
ch := make(chan string)
go func() {
time.Sleep(10 * time.Second)
select {
case ch <- "abc":
default:
// When context deadline exceeded, there is no receiver
// This case will prevent goroutine blocking forever
return
}
}()
select {
case <-ctx.Done():
return "", ctx.Err()
case result := <-ch:
return result, nil
}
}
func main() {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
fmt.Printf("[%v] Begin make request \n", time.Now())
abc, err := makeHTTPRequest(ctx)
if err != nil {
fmt.Printf("[%v] Return error: %v \n", time.Now(), err)
return
}
fmt.Printf("[%v] %s", time.Now(), abc)
}
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