fusen-render/websocket.go

package fusenrender

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"time"

	"github.com/gorilla/websocket"
	"github.com/lni/dragonboat/v4"
	"github.com/lni/dragonboat/v4/client"
)

var UidCreater = NewUniqueId(1)
var PopChannel chan []byte = make(chan []byte, 3) // chan *QueueItem = make(chan *QueueItem, 1)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
}

func HttpListen(ns *dragonboat.NodeHost, port int) {
	http.HandleFunc("/api/queue/push", pushRenderTaskHandler)
	http.HandleFunc("/ws/pop/queue", queueHandler)
	http.HandleFunc("/ws/callback", callbackHandler)
	log.Printf(":%d", port)
	http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
}

func queueHandler(w http.ResponseWriter, r *http.Request) {
	var err error
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println(err)
		return
	}
	defer conn.Close()

	log.Println("建立连接", DequeueHandler.RefCountAdd(1))
	defer func() {
		log.Println("退出连接", DequeueHandler.RefCountAdd(-1))
	}()

	for {

		// msgType, msg, err := conn.ReadMessage()

		// if err != nil {
		// 	log.Println(msgType, msg, err)
		// 	return
		// }

		itemdata := <-PopChannel

		// 写回消息
		err = conn.WriteMessage(websocket.BinaryMessage, itemdata)
		if err != nil {
			log.Println(err)
			var item QueueItem
			err = item.Decode(itemdata)
			if err != nil {
				log.Println(err)
				return
			}
			log.Println("重新回队")
			stateClient.PushItem(nil, &item)
			return
		}
		// 打印消息
		fmt.Printf("%s len=%d sent: \n ", conn.RemoteAddr(), len(itemdata))

		// 读取消息
		// msgType, msg, err := conn.ReadMessage()

		// if err != nil {
		// 	log.Println(msgType, msg, err)
		// 	return
		// }

	}
}

func callbackHandler(w http.ResponseWriter, r *http.Request) {
	conn, _ := upgrader.Upgrade(w, r, nil)

	for {
		// 读取消息
		msgType, msg, err := conn.ReadMessage()
		if err != nil {
			return
		}

		// 打印消息
		fmt.Printf("%s sent: %s\n", conn.RemoteAddr(), string(msg))

		// 写回消息
		err = conn.WriteMessage(msgType, msg)
		if err != nil {
			return
		}
	}
}

func pushRenderTaskHandler(w http.ResponseWriter, r *http.Request) {
	// 1. 读取Body内容
	body, err := io.ReadAll(r.Body)
	if err != nil {
		panic(err)
	}

	// 2. 定义结构体

	item := QueueItem{}

	// 3. 解析JSON到结构体
	err = json.Unmarshal(body, &item)
	if err != nil {
		panic(err)
	}

	stateClient.PushItem(nil, &item)
}

type StateClient struct {
	nh *dragonboat.NodeHost
}

var stateClient *StateClient

func (cli *StateClient) GetNoOPSession() *client.Session {
	return cli.nh.GetNoOPSession(shardID)
}

func (cli *StateClient) PushItem(cs *client.Session, item *QueueItem) {
	if cs == nil {
		cs = cli.GetNoOPSession()
	}

	cmd := &CmdEnqueue{Command: Command{Group: "test"}}
	cmd.Item = item
	data, err := FsPasser.PackToBytes(cmd)

	if err != nil {
		log.Println(err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
	_, err = cli.nh.SyncPropose(ctx, cs, data)
	if err != nil {
		log.Println(err)
	}

	// log.Println("enqueue", len(result.Data))
	cancel()
}

func (cli *StateClient) PopItem(cs *client.Session, group string) (*QueueItem, error) {
	if cs == nil {
		cs = cli.GetNoOPSession()
	}

	cmd := &CmdDequeue{Command{Group: "test"}}
	data, err := FsPasser.PackToBytes(cmd)
	if err != nil {
		log.Println(err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	result, err := cli.nh.SyncPropose(ctx, cs, data)
	cancel()

	if err != nil {
		return nil, err
	}

	if len(result.Data) == 0 {
		return nil, nil
	}

	var item QueueItem
	err = item.Decode(result.Data)
	if err != nil {
		log.Println(err)
	}
	return &item, nil
}