VideoStream/handler/tool.go

package handler

import (
	"VideoStream/proto"
	"VideoStream/service"
	"VideoStream/worker"
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/gorilla/websocket"
	"gocv.io/x/gocv"
	"io"
	"log"
	"net/http"
	"strconv"
	"time"
)

var (
	upgrader = websocket.Upgrader{
		ReadBufferSize:  1024,
		WriteBufferSize: 1024,
		CheckOrigin: func(r *http.Request) bool {
			// 允许所有来源的连接
			return true
		},
	}
)

func SetUpToolGroup(router *gin.Engine) {
	toolGroup := router.Group("/tool")
	toolGroup.GET("/video_stream", GetVideoStream)
	toolGroup.GET("/video_real_time", GetRealTimeImage)
}

// 跨域访问：cross  origin resource share
func CorsHandler() gin.HandlerFunc {
	return func(context *gin.Context) {
		//method := context.Request.Method
		context.Writer.Header().Set("Access-Control-Allow-Origin", "*")
		context.Header("Access-Control-Allow-Origin", "*") // 设置允许访问所有域
		context.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE,UPDATE")
		context.Header("Access-Control-Allow-Headers", "Authorization, Content-Length, X-CSRF-Token, Token,session,X_Requested_With,Accept, Origin, Host, Connection, Accept-Encoding, Accept-Language,DNT, X-CustomHeader, Keep-Alive, User-Agent, X-Requested-With, If-Modified-Since, Cache-Control, Content-Type, Pragma,token,openid,opentoken")
		context.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers,Cache-Control,Content-Language,Content-Type,Expires,Last-Modified,Pragma,FooBar")
		context.Header("Access-Control-Max-Age", "172800")
		context.Header("Access-Control-Allow-Credentials", "false")
		context.Set("content-type", "application/json") //设置返回格式是json

		//  if method == "OPTIONS" {
		// 	 context.JSON(http.StatusOK, gin.H{
		// 		"code":1,
		// 		"message":"error",
		// 		"data":"request error",
		// 	 })
		//  }

		//处理请求
		context.Next()
	}
}

type videoStreamReq struct {
	ID  int    `json:"id" form:"id"`
	Key string `json:"key" form:"key"`
}

func GetVideoStream(c *gin.Context) {
	var req videoStreamReq
	id, _ := c.Get("id")
	id1 := id.(int)
	//将query参数绑定到结构体
	if err := c.ShouldBind(&req); err != nil {
		c.JSON(400, gin.H{"error": err.Error()})
		return
	} else {
		//校验权限
		device := service.GetDevice(req.ID, id1)
		if device.ID == 0 {
			c.JSON(400, gin.H{"error": "device not exist"})
			return
		}
		//查看id是否存在
		index := -1
		for _, device := range proto.Config.DeviceInfo {
			if device.ID == req.ID {
				index = req.ID
				break
			}
		}
		if index == -1 {
			c.JSON(400, gin.H{"error": "id not exist"})
			return
		}
		//查看key是否正确
		if req.Key != "123456" {
			c.JSON(400, gin.H{"error": "key error"})
			return
		}
		//设备流
		c.Stream(func(w io.Writer) bool {
			var count int
			var frame gocv.Mat
			for {
				cnt := service.GetDeviceCurrentFrameV2(&frame, req.ID)
				if cnt == count {
					time.Sleep(50 * time.Millisecond)
					continue
				}
				//gocv.Matrix转为jpeg
				img, err2 := gocv.IMEncode(".jpg", frame)
				if err2 != nil {
					fmt.Printf("img encode err:%v", err2)
					time.Sleep(50 * time.Millisecond)
					continue
				}
				frame_ := img.GetBytes()

				_, err = w.Write([]byte("--frame\r\nContent-Type: image/jpeg\r\n\r\n"))
				if err != nil {
					fmt.Printf("写入头部信息错误: %v\n", err)
					return false
				}
				_, err = w.Write(frame_)
				if err != nil {
					fmt.Printf("写入帧数据错误: %v\n", err)
					return false
				}
				_, err = w.Write([]byte("\r\n"))
				if err != nil {
					fmt.Printf("写入帧结束标记错误: %v\n", err)
					return false
				}
				time.Sleep(50 * time.Millisecond) // 控制帧率，模拟每秒约20帧，可按实际调整
			}
		})

	}
}

// 发送实时视频流
func GetRealTimeImage(c *gin.Context) {
	id, _ := c.Get("id")
	id1 := id.(int)
	device_id := c.Query("device_id")
	device_id_int, _ := strconv.Atoi(device_id)
	device := service.GetDevice(device_id_int, id1)
	if device.ID == 0 {
		c.JSON(http.StatusOK, gin.H{"code": 4, "message": "device not found"})
		return
	}
	ws, err := upgrader.Upgrade(c.Writer, c.Request, nil)
	if err != nil {
		log.Printf("connect wss err:%v", err)
		return
	}
	worker.SetRedisWithExpire(strconv.Itoa(int(device.ID))+"_is_play", "1", time.Minute*5)
	log.Printf("device_id:%d  has set is_play to 1", device_id_int)
	go subscribeAndHandleMessagesV3(ws, device_id_int)
}

func subscribeAndHandleMessagesV3(ws *websocket.Conn, device_id int) {
	// 生成唯一连接 uuid
	con_id := uuid.New().String()
	online_conn_key := "device_" + strconv.Itoa(device_id) + "_online_conn_ids"
	// 加入设备在线连接集合
	worker.SetRedisSetAddWithExpire(online_conn_key, con_id, time.Minute*5)
	//图片计数器
	count := 0
	//定时器，发送计数器
	tCount := 0
	//从service获取当前帧
	var img gocv.Mat
	for {
		c := service.GetDeviceCurrentFrameV2(&img, device_id)
		if c != count {
			//将img转[]byte
			if img.Empty() {
				log.Printf("device:%d img is empty! count=%d", device_id, c)
			} else {
				//gocv.Matrix转为jpeg
				buf, err := gocv.IMEncode(".jpg", img)
				if err != nil {
					log.Printf("img encode err:%v", err)
					worker.SetRedisSetRemove(online_conn_key, con_id)
					break
				}
				buf1 := buf.GetBytes()

				err2 := ws.WriteMessage(websocket.BinaryMessage, buf1)
				if err2 != nil {
					log.Printf("send message to client err:%v", err2)
					worker.SetRedisSetRemove(online_conn_key, con_id)
					break
				}
				c = count
				err4 := img.Close()
				if err4 != nil {
					log.Printf("close img err:%v", err)
				}
			}
		} else {
			//每秒发送一次心跳检测
			if tCount%10 == 0 {
				err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(time.Second))
				if err != nil {
					log.Printf("Connection check failed:%v", err)
					worker.SetRedisSetRemove(online_conn_key, con_id)
					break
				}
			}
		}
		time.Sleep(100 * time.Millisecond)
		tCount++
	}

	//关闭img
	err := img.Close()
	if err != nil {
		log.Printf("img close err:%v", err)
	}

	// 查看是否还有其他连接，没有则设置 is_play 为 0
	if worker.IsContainKey(online_conn_key) == false {
		worker.SetRedisWithExpire(strconv.Itoa(device_id)+"_is_play", "1", time.Minute*5)
		log.Printf("device_id: %d has set is_play to 0", device_id)
	}
}