一个简单demo展示接口请求超时处理

package main

import (
	"context"
	"errors"
	"fmt"
	"time"
)

type result struct {
	record string
	err error
}

func search(term string) (string, error) {
	time.Sleep(200 * time.Millisecond)
	return "some value", nil
}

func process(term string) error {
	 ctx, cancel := context.WithTimeout(context.Background(), 100 * time.Millisecond)
	 defer cancel()

	 // 此处使用容量为1的chan是为了防止goroutine泄露
	 ch := make(chan result, 1)
	 go func() {
		 record, err := search(term)
		 ch <- result{record: record, err: err}
	 }()
	select {
	case <- ctx.Done():
		return errors.New("search canceled")
	case result := <- ch:
		if result.err != nil {
			return result.err
		}
		fmt.Println("record:", result.record)
		return nil
	 }
}