golang关于channel

缓冲相关

无缓冲的channel是同步的，而有缓冲的channel是非同步的
无缓冲channel在没有接收方的时候，发送方会阻塞
有缓冲channel在没有接收方的时候，如果缓冲区未满，则发送方并不会阻塞

type keyAndValue struct {
	Key   string
	Value interface{}
}

func DealNids(ctx context.Context, ids []string) (string, error) {
	if len(ids) == 0 {
		return "",nil
	}
	waitGroup, channel := sync.WaitGroup{}, make(chan keyAndValue, len(ids))
	for _, id := range ids {
		waitGroup.Add(1)
		go func(ctx context.Context, channel chan keyAndValue, waitGroup *sync.WaitGroup, id string) {
			defer waitGroup.Done()
			newId := id + "123"
			data := keyAndValue{
				Key: newId,
				Value: newId,
			}
			channel <- data
		}(ctx, channel, &waitGroup, id)
	}
	waitGroup.Wait()
	close(channel)

	result := make(map[string]interface{}, 0)
	redisRes := ""
	for value := range channel {
		result[value.Key] = value.Value
	}
	return redisRes, nil
}
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