refactor(realtime): extract "SocketClient" to separate class "RealtimeClientConnection"

Signed-off-by: BoHong Li <a60814billy@gmail.com>

Author: a60814billy

lib/realtime.js

@@ -21,6 +21,8 @@ var models = require('./models')
 // ot
 var ot = require('./ot')
 
+const {RealtimeClientConnection} = require('./realtimeClientConnection')
+
 // public
 var realtime = {
   io: null,
@@ -780,239 +782,6 @@ function getNoteFromNotePool (noteId) {
   return notes[noteId]
 }
 
-class SocketClient {
-  constructor (socket) {
-    this.socket = socket
-  }
-
-  registerEventHandler () {
-    // received client refresh request
-    this.socket.on('refresh', this.refreshEventHandler.bind(this))
-    // received user status
-    this.socket.on('user status', this.userStatusEventHandler.bind(this))
-    // when a new client disconnect
-    this.socket.on('disconnect', this.disconnectEventHandler.bind(this))
-    // received cursor focus
-    this.socket.on('cursor focus', this.cursorFocusEventHandler.bind(this))
-    // received cursor activity
-    this.socket.on('cursor activity', this.cursorActivityEventHandler.bind(this))
-    // received cursor blur
-    this.socket.on('cursor blur', this.cursorBlurEventHandlder.bind(this))
-    // check version
-    this.socket.on('version', this.checkVersionEventHandler.bind(this))
-    // received sync of online users request
-    this.socket.on('online users', this.onlineUsersEventHandler.bind(this))
-    // reveiced when user logout or changed
-    this.socket.on('user changed', this.userChangedEventHandler.bind(this))
-    // delete a note
-    this.socket.on('delete', this.deleteNoteEventHandler.bind(this))
-    // received note permission change request
-    this.socket.on('permission', this.permissionChangeEventHandler.bind(this))
-  }
-
-  isUserLoggedIn () {
-    return this.socket.request.user && this.socket.request.user.logged_in
-  }
-
-  isNoteAndUserExists () {
-    const note = getNoteFromNotePool(this.socket.noteId)
-    const user = getUserFromUserPool(this.socket.id)
-    return note && user
-  }
-
-  isNoteOwner () {
-    const note = this.getCurrentNote()
-    return get(note, 'owner') === this.getCurrentLoggedInUserId()
-  }
-
-  isAnonymousEnable () {
-    //TODO: move this method to config module
-    return config.allowAnonymous || config.allowAnonymousEdits
-  }
-
-  disconnectSocketOnNote (note) {
-    note.socks.forEach((sock) => {
-      if (sock) {
-        sock.emit('delete')
-        setImmediate(() => {
-          sock.disconnect(true)
-        })
-      }
-    })
-  }
-
-  getCurrentUser () {
-    if (!this.socket.id) return
-    return getUserFromUserPool(this.socket.id)
-  }
-
-  getCurrentLoggedInUserId () {
-    return get(this.socket, 'request.user.id')
-  }
-
-  getCurrentNote () {
-    if (!this.socket.noteId) return
-    return getNoteFromNotePool(this.socket.noteId)
-  }
-
-  getNoteChannel () {
-    return this.socket.broadcast.to(this.socket.noteId)
-  }
-
-  async destroyNote (id) {
-    return models.Note.destroy({
-      where: { id: id }
-    })
-  }
-
-  async changeNotePermission (newPermission) {
-    const changedRows = await models.Note.update({
-      permission: newPermission
-    }, {
-      where: {
-        id: this.getCurrentNote().id
-      }
-    })
-    if (changedRows !== 1) {
-      throw new Error(`update database failed, cannot set permission ${newPermission} to note ${this.getCurrentNote().id}`)
-    }
-  }
-
-  notifyPermissionChanged () {
-    realtime.io.to(this.getCurrentNote().id).emit('permission', {
-      permission: this.getCurrentNote().permission
-    })
-    this.getCurrentNote().socks.forEach((sock) => {
-      if (sock) {
-        if (!exports.checkViewPermission(sock.request, this.getCurrentNote())) {
-          sock.emit('info', {
-            code: 403
-          })
-          setTimeout(function () {
-            sock.disconnect(true)
-          }, 0)
-        }
-      }
-    })
-  }
-
-  refreshEventHandler () {
-    exports.emitRefresh(this.socket)
-  }
-
-  checkVersionEventHandler () {
-    this.socket.emit('version', {
-      version: config.fullversion,
-      minimumCompatibleVersion: config.minimumCompatibleVersion
-    })
-  }
-
-  userStatusEventHandler (data) {
-    if (!this.isNoteAndUserExists()) return
-    const user = this.getCurrentUser()
-    if (config.debug) {
-      logger.info('SERVER received [' + this.socket.noteId + '] user status from [' + this.socket.id + ']: ' + JSON.stringify(data))
-    }
-    if (data) {
-      user.idle = data.idle
-      user.type = data.type
-    }
-    exports.emitUserStatus(this.socket)
-  }
-
-  userChangedEventHandler () {
-    logger.info('user changed')
-
-    const note = this.getCurrentNote()
-    if (!note) return
-    const user = note.users[this.socket.id]
-    if (!user) return
-
-    exports.updateUserData(this.socket, user)
-    exports.emitOnlineUsers(this.socket)
-  }
-
-  onlineUsersEventHandler () {
-    if (!this.isNoteAndUserExists()) return
-
-    const currentNote = this.getCurrentNote()
-
-    const currentNoteOnlineUserList = Object.keys(currentNote.users)
-      .map(key => buildUserOutData(currentNote.users[key]))
-
-    this.socket.emit('online users', {
-      users: currentNoteOnlineUserList
-    })
-  }
-
-  cursorFocusEventHandler (data) {
-    if (!this.isNoteAndUserExists()) return
-    const user = this.getCurrentUser()
-    user.cursor = data
-    const out = buildUserOutData(user)
-    this.getNoteChannel().emit('cursor focus', out)
-  }
-
-  cursorActivityEventHandler (data) {
-    if (!this.isNoteAndUserExists()) return
-    const user = this.getCurrentUser()
-    user.cursor = data
-    const out = buildUserOutData(user)
-    this.getNoteChannel().emit('cursor activity', out)
-  }
-
-  cursorBlurEventHandlder () {
-    if (!this.isNoteAndUserExists()) return
-    const user = this.getCurrentUser()
-    user.cursor = null
-    this.getNoteChannel().emit('cursor blur', {
-      id: this.socket.id
-    })
-  }
-
-  deleteNoteEventHandler () {
-    // need login to do more actions
-    if (this.isUserLoggedIn() && this.isNoteAndUserExists()) {
-      const note = this.getCurrentNote()
-      // Only owner can delete note
-      if (note.owner && note.owner === this.getCurrentLoggedInUserId()) {
-        this.destroyNote(note.id)
-          .then((successRows) => {
-            if (!successRows) return
-            this.disconnectSocketOnNote(note)
-          })
-          .catch(function (err) {
-            return logger.error('delete note failed: ' + err)
-          })
-      }
-    }
-  }
-
-  permissionChangeEventHandler (permission) {
-    if (!this.isUserLoggedIn()) return
-    if (!this.isNoteAndUserExists()) return
-
-    const note = this.getCurrentNote()
-    // Only owner can change permission
-    if (!this.isNoteOwner()) return
-    if (!this.isAnonymousEnable() && permission === 'freely') return
-
-    this.changeNotePermission(permission)
-      .then(() => {
-        console.log('---')
-        note.permission = permission
-        this.notifyPermissionChanged()
-      })
-      .catch(err => logger.error('update note permission failed: ' + err))
-  }
-
-  disconnectEventHandler () {
-    if (isDuplicatedInSocketQueue(disconnectSocketQueue, this.socket)) return
-    disconnectSocketQueue.push(this.socket)
-    exports.disconnect(this.socket)
-  }
-}
-
 function connection (socket) {
   if (realtime.maintenance) return
   exports.parseNoteIdFromSocket(socket, function (err, noteId) {
@@ -1068,7 +837,7 @@ function connection (socket) {
     exports.startConnection(socket)
   })
 
-  const socketClient = new SocketClient(socket)
+  const socketClient = new RealtimeClientConnection(socket)
   socketClient.registerEventHandler()
 }
 
@@ -1086,6 +855,9 @@ exports.emitUserStatus = emitUserStatus
 exports.disconnect = disconnect
 exports.emitOnlineUsers = emitOnlineUsers
 exports.checkViewPermission = checkViewPermission
+exports.getNoteFromNotePool = getNoteFromNotePool
+exports.getUserFromUserPool = getUserFromUserPool
+exports.buildUserOutData = buildUserOutData
 exports.notes = notes
 exports.users = users
 exports.disconnectSocketQueue = disconnectSocketQueue