使用BroadcastChannel建立较为可靠的连接

如需安装所有解决方案，请参考全量解决方案安装

使用BroadcastChannel，同源的不同标签页之间可以相互通信，有的时候，一些操作需要在一个标签页面执行，然后广播给其他标签页。

比如：和服务器建立WebSocket通信，只能一个标签页和服务器建立通信，这个时候就需要多个标签页之间协调出一个主标签页建立连接，将消息广播给其他标签页。

此方案基于BroadcastChannel:

相对可靠的。
动态更新tab标签页列表。
主节点选举。
事件监听。

实现流程如下

标签初始化：标签页面打开，连接BroadcastChannel时，先广播消息（id为当前时间+随机数）。
已存在标签回复：已经存在的标签页面广播通道收到广播消息，进行回复。
ID 收集：收到回复后，将该标签页添加到id列表（friendChannelIdSet）中。
ID列表确认：一定时间（300ms）后，根据收到的最新的id列表（friendChannelIdSet），可以知道都有那些标签页。
主节点选举：根据id列表信息（friendChannelIdSet），可以知道自己是否可以为主节点。
主节点职责：
- 定时发送主节点心跳广播信息。
- 并将id列表信息保存为旧节点信息列表（_oldFrendChannelIdList）。
- 清空id列表信息（friendChannelIdSet）。
- 根据旧列表重新评估主状态；必要恢复成普通节点。
心跳监听：
- 回复主节点心跳。
- 将id列表信息保存为旧节点信息列表（_oldFrendChannelIdList）。
- 清空当前 ID 列表。
- 将主节点添加到id列表中。
处理回复：所有监听此广播通道的标签页，收到主节点广播信息的回复信息后，将其对应id添加到id列表信息中（friendChannelIdSet）
申请为主节点：其他监听此广播通道的非主节点标签页，每次收到主节点心跳广播信息，会设置一个超时时间，如果超时了没收到主节点信息，则认为主节点不在了：
- 广播申请为主节点。
- 一定时间内，如果收到其他标签页的拒绝信息，则不成为主节点，如果没收到拒绝信息，则成为主节点。
选举协商：收到其他标签页申请为主节点的消息后，根据自己的id，回复其是否可以为主节点。

单独安装此javascript类

npmyarnpnpm

shell

npm install @havue/bc-connect --save

shell

yarn add @havue/bc-connect

shell

pnpm install @havue/bc-connect

使用

引入

import { BroadcastChannelManager } from 'havue'
// or
import { BroadcastChannelManager } from '@havue/solutions'
// or
import { BroadcastChannelManager } from '@havue/bc-connect'

示例

可复制当前页面地址，通过其他标签页打开，进行通信。

Node id list

Current tab node id:

current tab node type:

Message:

Target node id:

点我看代码

templatescriptstyle

vue

<template>
  <div class="brdCnl-box">
    <div class="left-box">
      <div class="title">Node id list</div>
      <div class="friend-item" v-for="friend in friendList" :key="friend">{{ friend }}</div>
    </div>
    <div class="right-box">
      <div class="current-info">Current tab node id: {{ currentBcId }}</div>
      <div class="current-info">current tab node type: {{ currentBcNodeType }}</div>
      <div class="options-box">
        <div class="form-item"><span class="label">Message:</span><input v-model="message" /></div>
        <button class="borad-btn" @click="handleBroadMessage">广播(Broadcast)</button>
        <div class="form-item"><span class="label">Target node id:</span><input v-model="targetId" /></div>
        <button class="sigle-btn" @click="handleBroadOneMessage">Single talk</button>
      </div>
      <div class="message-box">
        <div class="message-item" v-for="message in recieveMessageList" :key="message.id">
          <div class="id">id:{{ message.id }}</div>
          <div class="data">data: {{ message.data }}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup lang="ts">
import type { BcConnectSendMessageType } from '@havue/bc-connect'
import { ref, onMounted, onBeforeUnmount } from 'vue'
// import { BroadcastChannelManager, BcConnectEventTypeEnum } from '@havue/bc-connect'
import { BroadcastChannelManager, BcConnectEventTypeEnum } from '@havue/solutions'

let bcManager: BroadcastChannelManager | null = null

const currentBcId = ref()
const currentBcNodeType = ref()

const friendList = ref<Array<number>>([])
const message = ref()
const targetId = ref()

const recieveMessageList = ref<Array<BcConnectSendMessageType>>([])

function handleBroadMessage() {
  if (!message.value) {
    alert('Please enter message')
    return
  }
  bcManager?.send('test-message', message.value)
}

function handleBroadOneMessage() {
  if (!message.value) {
    alert('Please enter message')
    return
  }
  if (!targetId.value) {
    alert('Please enter target id')
    return
  }
  bcManager?.sendToTarget('test-message', Number(targetId.value), message.value)
}

onMounted(() => {
  if (!bcManager) {
    bcManager = new BroadcastChannelManager('bc_test')
  }

  currentBcId.value = bcManager.id
  friendList.value = bcManager.friendList
  bcManager.connect()
  bcManager.on('test-message', (info) => {
    recieveMessageList.value.push(info)
  })
  bcManager.on(BcConnectEventTypeEnum.Friend_List_Update, (info) => {
    friendList.value = info.data || []
  })
  bcManager.on(BcConnectEventTypeEnum.Node_Type_Change, (info) => {
    currentBcNodeType.value = info.data
  })
})

onBeforeUnmount(() => {
  bcManager?.close()
  bcManager?.destroy()
  bcManager = null
})
</script>

scss

<style lang="scss" scoped>
.brdCnl-box {
  box-sizing: border-box;
  display: flex;
  width: 100%;
  height: 600px;
  color: black;
  background-color: #4d797c;

  .left-box {
    width: 30%;
    overflow: auto;

    .title {
      font-size: 18px;
      font-weight: bold;
    }

    .friend-item {
      padding: 6px 10px;
      margin: 5px;
      background-color: rgb(100 148 237);
    }
  }

  .right-box {
    display: flex;
    flex: 1;
    flex-direction: column;
    padding: 5px 10px;
    background-color: #4e7c4d;

    .current-info {
      padding: 3px 5px;
      background-color: #a8b9be;
    }

    .message-box {
      flex: 1;
      margin-top: 10px;
      overflow: auto;
      background-color: antiquewhite;

      .message-item {
        padding: 5px;
        margin: 5px;
        background-color: #8cbba9;

        .id {
          font-weight: bold;
        }

        .message {
          color: #44b15c;
        }
      }
    }

    .form-item {
      display: flex;
      align-items: center;
      margin: 5px 20px;

      .label {
        display: inline-block;
        width: 100px;
        text-align: right;
      }

      input {
        flex: 1;
        padding: 5px;
        font-size: 16px;
        color: #fff;
        background-color: black;
      }
    }

    button {
      width: 100%;
      color: black;
      background-color: #a8b9be;
    }
  }
}
</style>

源码

manager.ts

// #region typedefine
/** 事件数据类型 | Event Datatypes */
export type BcConnectSendMessageType = {
  /** 事件类型 | type */
  type: string
  /** 数据 | data */
  data: any
  /** 发送事件的实例id | BroadcastChannelManager instance id */
  id: number
  /** 此消息的目标实例id | The target instance id for this message */
  targetId?: number
}

/** 事件类型 | Event types */
export enum BcConnectEventTypeEnum {
  /** 初始广播 | Initial broadcast */
  Broadcast = '__BCM_INIT__',
  /** 回复初始广播 | Reply to initial broadcast */
  Broadcast_Reply = '__BCM_INIT_REPLY__',
  /** 主节点心跳 | Master node heartbeat */
  Main_Node_Hearbeat = '__BCM_MAIN_NODE_HEARBEAT__',
  /** 回复主节点心跳 | Reply to the master node heartbeat */
  Res_Main_Node_Hearbeat = '__BCM_MAIN_NODE_HEARBEAT_REPLY__',
  /**
   * 长时间未收到主节点心跳，申请成为主节点
   * It has not received the heartbeat of the master node for a long time.
   *  Apply to become the master node
   */
  Req_Be_Main_Node = '__BCM_REQ_BE_MAIN_NODE__',
  /** 拒绝其他节点成为主节点 | Reject other nodes as master nodes */
  Res_Be_Main_Node = '__BCM_REQ_BE_MAIN_NODE_REJECT__',
  /** 当前节点类型更改 | The current node type has changed */
  Node_Type_Change = '__BCM_NODE_TYPE_CHANGE__',
  /** 其他标签页BC节点id列表更新 | Other TAB node id list updated */
  Friend_List_Update = '__BCM_FRIEND_LIST_UPDATE__'
}

/** BroadcastChannel节点类型 | BroadcastChannel node type */
export enum BcConnectNodeTypeEnum {
  Main = 'main',
  Normal = 'normal'
}
// #endregion typedefine

// 消息超时时间 | Message timeout time
const MessageTimeout = 300

/**
 * 使用BroadcastChannel与其他标签页进行通信
 * Use BroadcastChannel to communicate with other tabs
 */
export class BroadcastChannelManager {
  /** 通道名称 | Channel name */
  private _bcName: string
  /** BroadcastChannel instance */
  private _broadcastChannel: BroadcastChannel | undefined = undefined
  /** Event map */
  private _eventMap: Map<string, Array<(_: BcConnectSendMessageType) => void>>
  /** 主节点发送心跳的interval | The interval at which the master node sends the heartbeat */
  private _mainNodeMsgInterval: number | null = null
  /** 认为主节点掉线的timeout | timeout to consider the primary node to be offline */
  private _mainNodeMsgTimeoutTimer: number | null = null
  /** 更新友方列表的timeout | Update the timeout of the friend list */
  private _updateFriendListTimer: number | null = null
  /** 当前实例id | Current instance id */
  public id: number = Date.now() + Math.random()
  /** 其他广播通道id列表 | List of other broadcast channel ids */
  private _oldFrendChannelIdList: Array<number> = []
  /** 正在更新的id数组 | The id array being updated */
  private _friendChannelIdSet: Set<number> = new Set()
  /** 当前节点类型 | Current node type */
  private _nodeType: BcConnectNodeTypeEnum | undefined = undefined

  /**
   * 是否开启调试模式，会在控制台打印相关信息
   * If debug mode is enabled, it will print information to the console
   */
  private _debug: boolean = false

  constructor(name: string, debug: boolean = false) {
    this._debug = debug
    this._bcName = name
    this._eventMap = new Map()
    this._debug && console.log('BC:id:', this.id)
  }

  get nodeType() {
    return this._nodeType
  }

  get friendList() {
    return [...this._oldFrendChannelIdList]
  }

  public connect() {
    this._debug && console.log('BC:bc connect')
    this.close()
    this._broadcastChannel = new BroadcastChannel(this._bcName)
    this._bindBroadcastChannelEvent()
    this._updateFriendList()
  }

  public close() {
    this._debug && console.log('BC:bc close')
    this._broadcastChannel && this._broadcastChannel.close()
    this._broadcastChannel = undefined
    this._updateFriendListTimer && clearTimeout(this._updateFriendListTimer)
    this._updateFriendListTimer = null
    this._mainNodeMsgInterval && clearInterval(this._mainNodeMsgInterval)
    this._mainNodeMsgInterval = null
    this._mainNodeMsgTimeoutTimer && clearTimeout(this._mainNodeMsgTimeoutTimer)
    this._mainNodeMsgTimeoutTimer = null
    this._oldFrendChannelIdList = []
    this._friendChannelIdSet.clear()
    this._nodeType = undefined
  }

  /**
   * 切换节点类型 | Switching node type
   * @param {BcConnectNodeTypeEnum} type
   * @returns
   */
  private _setNodeType(type: BcConnectNodeTypeEnum) {
    if (this._nodeType === type) {
      return
    }
    this._nodeType = type
    this.emit(BcConnectEventTypeEnum.Node_Type_Change, {
      type: BcConnectEventTypeEnum.Node_Type_Change,
      data: type,
      id: this.id
    })
  }

  /** 更新广播id列表 | Update the list of broadcast ids */
  private _updateFriendList() {
    // 广播告知己方存在 | Broadcast your presence
    this.send(BcConnectEventTypeEnum.Broadcast)

    this._updateFriendListTimer && clearTimeout(this._updateFriendListTimer)

    this._updateFriendListTimer = setTimeout(() => {
      this._oldFrendChannelIdList = this._getNewFriendList()
      this._debug && console.log('BC:connect:updateFriendChannelIdList:', this._oldFrendChannelIdList)
      this.emit(BcConnectEventTypeEnum.Friend_List_Update, {
        type: BcConnectEventTypeEnum.Friend_List_Update,
        data: [...this._oldFrendChannelIdList],
        id: this.id
      })
      this._updataNodeType()
    }, MessageTimeout)
  }
  /** 绑定事件 | Bind event */
  private _bindBroadcastChannelEvent() {
    this._broadcastChannel &&
      (this._broadcastChannel.onmessage = (event) => {
        const { type, targetId } = event.data
        if (targetId && targetId !== this.id) {
          return
        }
        this.emit(type, event.data)
      })

    // 收到初始广播 | Receiving the initial broadcast
    this.on(BcConnectEventTypeEnum.Broadcast, (data) => {
      const { id } = data
      if (!this._friendChannelIdSet.has(id)) {
        this._friendChannelIdSet.add(id)
      }

      this.sendToTarget(BcConnectEventTypeEnum.Broadcast_Reply, id)
    })

    // 收到初始广播回复 | The initial broadcast reply is received
    this.on(BcConnectEventTypeEnum.Broadcast_Reply, (data) => {
      const { id } = data
      this._addFriend(id)
    })

    // 收到其他节点申请为主节点 | Others apply for the master node
    this.on(BcConnectEventTypeEnum.Req_Be_Main_Node, (data) => {
      const { id } = data
      if (id > this.id) {
        this.sendToTarget(BcConnectEventTypeEnum.Res_Be_Main_Node, id)
      }
    })

    // 收到主节点心跳回复 | Received the master node heartbeat reply
    this.on(BcConnectEventTypeEnum.Res_Main_Node_Hearbeat, (data) => {
      this._addFriend(data.id)
    })

    this._bindNodeEvent()
  }

  /** 监听节点类型切换事件 |  */
  private _bindNodeEvent() {
    const onMainNodeHearbeat = (data: BcConnectSendMessageType) => {
      this._timeoutToBeMainNode()
      this._catchOldFriend()
      this._addFriend(data.id)
      this.send(BcConnectEventTypeEnum.Res_Main_Node_Hearbeat)
    }

    this.on(BcConnectEventTypeEnum.Node_Type_Change, (info) => {
      const { data } = info
      this._mainNodeMsgInterval && clearInterval(this._mainNodeMsgInterval)
      this._debug && console.log('BC:NODE_TYPE_CHANGE：', info.data)
      if (data === BcConnectNodeTypeEnum.Main) {
        // 定时发送主节点心跳 | The heartbeat of the master node is sent periodically
        this._mainNodeMsgInterval = setInterval(() => {
          this._catchOldFriend()
          this.send(BcConnectEventTypeEnum.Main_Node_Hearbeat)
        }, MessageTimeout)
      } else if (data === BcConnectNodeTypeEnum.Normal) {
        this._timeoutToBeMainNode()
      }
      // 收到主节点心跳, 重新更新友方列表 | Update the friend list after receiving the heartbeat of the master node
      this.on(BcConnectEventTypeEnum.Main_Node_Hearbeat, onMainNodeHearbeat)
    })
  }

  /** 获取最新的节点列表 | Get the latest node list */
  private _getNewFriendList() {
    return [...this._friendChannelIdSet].sort((a, b) => a - b)
  }
  /**
   * 更新当前节点类型 | Update the current node type
   */
  private _updataNodeType() {
    this._mainNodeMsgInterval && clearInterval(this._mainNodeMsgInterval)
    if (this._oldFrendChannelIdList.length === 0 || Math.min(...this._oldFrendChannelIdList) > this.id) {
      if (this._nodeType === BcConnectNodeTypeEnum.Main) {
        return
      }
      this._setNodeType(BcConnectNodeTypeEnum.Main)
    } else {
      if (this._nodeType === BcConnectNodeTypeEnum.Normal) {
        return
      }
      this._setNodeType(BcConnectNodeTypeEnum.Normal)
    }
  }

  private _timeoutToBeMainNode() {
    this._mainNodeMsgTimeoutTimer && clearTimeout(this._mainNodeMsgTimeoutTimer)
    // 超时未收到心跳，认为主节点掉线，申请为主节点
    // If no heartbeat is received after the timeout, the master node is considered to be offline and the master node is applied
    this._mainNodeMsgTimeoutTimer = setTimeout(() => {
      this._req_beMainNode()
    }, MessageTimeout * 3)
  }

  /**
   * 保存最新的节点列表到_oldFrendChannelIdList，清空_friendChannelIdSet
   * Save the latest node list to _oldFrendChannelIdList and clear _friendChannelIdSet
   */
  private _catchOldFriend() {
    const newFriendList = this._getNewFriendList()
    if (this._oldFrendChannelIdList.join() !== newFriendList.join()) {
      this._debug && console.log('BC:updateFriendChannelIdList:', newFriendList)
      this.emit(BcConnectEventTypeEnum.Friend_List_Update, {
        type: BcConnectEventTypeEnum.Friend_List_Update,
        data: [...newFriendList],
        id: this.id
      })
      this._oldFrendChannelIdList = [...newFriendList]
    }

    if (this._nodeType === BcConnectNodeTypeEnum.Main && Math.min(...this._oldFrendChannelIdList) < this.id) {
      // 有更小的id，不再为主节点 | Has a smaller id and is no longer a master node
      this._setNodeType(BcConnectNodeTypeEnum.Normal)
    }

    this._friendChannelIdSet.clear()
  }

  /**
   * 申请成为主节点 | Apply to be a master node
   */
  private _req_beMainNode() {
    this._debug && console.log('BC:req_beMainNode')

    // 向所有节点申请成为主节点 | Apply to all nodes to become master nodes
    this.send(BcConnectEventTypeEnum.Req_Be_Main_Node)

    // 如果长时间未回复，认为自己可以当主节点
    // If there is no reply for a long time, it considers itself to be the master
    const timer = setTimeout(() => {
      this._setNodeType(BcConnectNodeTypeEnum.Main)
    }, MessageTimeout)

    // 收到拒绝回复，清空timeout
    // Clear the timeout when you receive a rejection reply
    const handleRes_beMainNode = () => {
      clearTimeout(timer)
      this.off(BcConnectEventTypeEnum.Res_Be_Main_Node, handleRes_beMainNode)
    }

    this.on(BcConnectEventTypeEnum.Res_Be_Main_Node, handleRes_beMainNode)
  }

  /**
   * add node
   * @param id id
   */
  public _addFriend(id: number) {
    if (!this._friendChannelIdSet.has(id)) {
      this._friendChannelIdSet.add(id)
    }
  }

  /**
   * 广播消息 | Send Broadcast message
   * @param type 消息类型 | Message type
   * @param data 数据 | data
   */
  public send(type: string, data?: any) {
    this._broadcastChannel?.postMessage({
      type,
      data,
      id: this.id
    })
  }

  /**
   * 给特定id的节点发送消息 | Send a message to a node with a specific id
   * @param type 消息类型 | Message type
   * @param targetId 目标节点id | Target Node id
   * @param data 数据 | data
   */
  public sendToTarget(type: string, targetId: number, data?: any) {
    this._broadcastChannel?.postMessage({
      type,
      data,
      id: this.id,
      targetId
    })
  }

  /**
   * 注册事件 | Registering events
   * @param { string } event 事件类型 | Event type
   * @param callback 回调 | callback
   * @returns void
   */
  public on(event: string, callback: (_: BcConnectSendMessageType) => void) {
    const callbacks = this._eventMap.get(event)
    if (!callbacks) {
      this._eventMap.set(event, [callback])
      return
    }

    if (callbacks.includes(callback)) {
      return
    }
    callbacks.push(callback)
  }

  /**
   * 注销事件 | Remove events
   * @param { string } event 事件类型 | Event type
   * @param callback 事件回调 | callback
   * @returns
   */
  public off(event: string, callback?: (_: BcConnectSendMessageType) => void) {
    const callbacks = this._eventMap.get(event)
    if (!callbacks) {
      return
    }

    if (!callback) {
      callbacks.length = 0
      return
    }

    const index = callbacks.indexOf(callback)
    callbacks.splice(index, 1)
  }

  /**
   * 触发事件 | Triggering events
   * @param { string } event 事件类型 | Event type
   * @param data 数据 | data
   */
  public emit(event: string, data: BcConnectSendMessageType) {
    const callbacks = this._eventMap.get(event) || []

    callbacks.forEach((cb) => {
      cb(data)
    })
  }

  /**
   * 销毁 | destroy
   */
  public destroy() {
    this._bcName = ''
    this._eventMap.clear()
    this._broadcastChannel?.close()
    this._broadcastChannel = undefined
    this._oldFrendChannelIdList = []
    this._friendChannelIdSet.clear()
    this.id = -1
    this._nodeType = undefined

    this._mainNodeMsgInterval && clearInterval(this._mainNodeMsgInterval)
    this._mainNodeMsgInterval = null
    this._mainNodeMsgTimeoutTimer && clearInterval(this._mainNodeMsgTimeoutTimer)
    this._mainNodeMsgTimeoutTimer = null
    this._debug && console.log('BC:destroy')
  }
}

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BroadcastChannelManager类介绍

构造函数

属性	说明	参数类型
constructor	构造函数, 参数为通道名称	`(name: string) => void`

实例属性

属性	说明	(参数)类型
id	实例id	`number`
nodeType	当前节点类型	`NodeTypeEnum \| null`
friendList	存储的其他标签页通道实例id列表	`number[]`
connect	建立通信，监听通道消息	`() => void`
close	断开通信，不再监听通道消息	`() => void`
destroy	销毁实例	`() => void`
send	广播消息,其他实例会触发`type`事件	`(type: string, data?:any) => void`
sendToTarget	给特定id的实例广播消息	`(type: string, targetId: number, data?:any) => void`
on	监听特定事件	`(event: string, callback: (_: SendMessageType) => void) => void`
off	取消监听事件, 不传`callback`会清空事件	`(event: string, callback?: (_: SendMessageType) => void) => void`
emit	触发事件	`(event: string, data: SendMessageType) => void`

类型定义

/** 事件数据类型 | Event Datatypes */
export type BcConnectSendMessageType = {
  /** 事件类型 | type */
  type: string
  /** 数据 | data */
  data: any
  /** 发送事件的实例id | BroadcastChannelManager instance id */
  id: number
  /** 此消息的目标实例id | The target instance id for this message */
  targetId?: number
}

/** 事件类型 | Event types */
export enum BcConnectEventTypeEnum {
  /** 初始广播 | Initial broadcast */
  Broadcast = '__BCM_INIT__',
  /** 回复初始广播 | Reply to initial broadcast */
  Broadcast_Reply = '__BCM_INIT_REPLY__',
  /** 主节点心跳 | Master node heartbeat */
  Main_Node_Hearbeat = '__BCM_MAIN_NODE_HEARBEAT__',
  /** 回复主节点心跳 | Reply to the master node heartbeat */
  Res_Main_Node_Hearbeat = '__BCM_MAIN_NODE_HEARBEAT_REPLY__',
  /**
   * 长时间未收到主节点心跳，申请成为主节点
   * It has not received the heartbeat of the master node for a long time.
   *  Apply to become the master node
   */
  Req_Be_Main_Node = '__BCM_REQ_BE_MAIN_NODE__',
  /** 拒绝其他节点成为主节点 | Reject other nodes as master nodes */
  Res_Be_Main_Node = '__BCM_REQ_BE_MAIN_NODE_REJECT__',
  /** 当前节点类型更改 | The current node type has changed */
  Node_Type_Change = '__BCM_NODE_TYPE_CHANGE__',
  /** 其他标签页BC节点id列表更新 | Other TAB node id list updated */
  Friend_List_Update = '__BCM_FRIEND_LIST_UPDATE__'
}

/** BroadcastChannel节点类型 | BroadcastChannel node type */
export enum BcConnectNodeTypeEnum {
  Main = 'main',
  Normal = 'normal'
}

使用BroadcastChannel建立较为可靠的连接 ​

实现流程如下 ​

单独安装此javascript类 ​

使用 ​

示例 ​

BroadcastChannelManager类介绍 ​

构造函数 ​

实例属性 ​

类型定义 ​

使用BroadcastChannel建立较为可靠的连接

实现流程如下

单独安装此javascript类

使用

示例

BroadcastChannelManager类介绍

构造函数

实例属性

类型定义