package mqtt2

import (
	"sync"

	"gitee.com/xuyiping_admin/pkg/logger/zaplog"
	"go.uber.org/zap"

	mqtt "github.com/eclipse/paho.mqtt.golang"
)

var bufferPool = sync.Pool{
	New: func() interface{} {
		return make([]byte, 1024) // 根据实际情况调整缓冲区大小
	},
}

// Consumer 处理收到的消息
func (s *MqttClient) Consumer(topic string, qos, workNumber int32) <-chan []byte {
	var subMsgChan = make(chan []byte, 2*workNumber)
	defer close(subMsgChan)
	if token := s.Client.Subscribe(topic, byte(qos), func(client mqtt.Client, msg mqtt.Message) {
		buffer := bufferPool.Get().([]byte)
		copy(buffer, msg.Payload())
		select {
		case subMsgChan <- buffer[:len(msg.Payload())]:
			bufferPool.Put(buffer)
		}
	}); token.Wait() && token.Error() != nil {
		close(subMsgChan)
		zaplog.Error("Consumer", zap.Any("topic", topic), zap.Any("err", token.Error()))
		return subMsgChan
	}

	go func() {
		for msg := range subMsgChan {
			bufferPool.Put(msg)
		}
	}()

	return subMsgChan
}