fix user presence

Author: Vikhyath Mondreti

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/hooks/use-presence.ts

@@ -3,6 +3,16 @@
 import { useMemo } from 'react'
 import { useSocket } from '@/contexts/socket-context'
 
+// Socket presence user from server
+interface SocketPresenceUser {
+  socketId: string
+  userId: string
+  userName: string
+  cursor?: { x: number; y: number }
+  selection?: { type: 'block' | 'edge' | 'none'; id?: string }
+}
+
+// UI presence user for components
 type PresenceUser = {
   connectionId: string | number
   name?: string
@@ -24,10 +34,17 @@ export function usePresence(): UsePresenceReturn {
   const { presenceUsers, isConnected } = useSocket()
 
   const users = useMemo(() => {
-    return presenceUsers.map((user, index) => ({
-      // Use socketId directly as connectionId to ensure uniqueness
-      // If no socketId, use a unique fallback based on userId + index
-      connectionId: user.socketId || `fallback-${user.userId}-${index}`,
+    // Deduplicate by userId - only show one presence per unique user
+    const uniqueUsers = new Map<string, SocketPresenceUser>()
+
+    presenceUsers.forEach((user) => {
+      // Keep the most recent presence for each user (last one wins)
+      uniqueUsers.set(user.userId, user)
+    })
+
+    return Array.from(uniqueUsers.values()).map((user) => ({
+      // Use userId as connectionId since we've deduplicated
+      connectionId: user.userId,
       name: user.userName,
       color: undefined, // Let the avatar component generate colors
       info: user.selection?.type ? `Editing ${user.selection.type}` : undefined,

apps/sim/contexts/socket-context.tsx

@@ -101,7 +101,21 @@ export function SocketProvider({ children, user }: SocketProviderProps) {
 
   // Initialize socket when user is available
   useEffect(() => {
-    if (!user?.id || socket) return
+    if (!user?.id) return
+
+    // Prevent duplicate connections - disconnect existing socket first
+    if (socket) {
+      logger.info('Disconnecting existing socket before creating new one')
+      socket.disconnect()
+      setSocket(null)
+      setIsConnected(false)
+    }
+
+    // Prevent multiple simultaneous initialization attempts
+    if (isConnecting) {
+      logger.info('Socket initialization already in progress, skipping')
+      return
+    }
 
     logger.info('Initializing socket connection for user:', user.id)
     setIsConnecting(true)
@@ -282,8 +296,16 @@ export function SocketProvider({ children, user }: SocketProviderProps) {
     // Start the socket initialization
     initializeSocket()
 
-    // Cleanup on unmount
+    // Cleanup on unmount or user change
     return () => {
+      if (socket) {
+        logger.info('Cleaning up socket connection')
+        socket.disconnect()
+        setSocket(null)
+        setIsConnected(false)
+        setIsConnecting(false)
+      }
+
       positionUpdateTimeouts.current.forEach((timeoutId) => {
         clearTimeout(timeoutId)
       })
@@ -295,15 +317,30 @@ export function SocketProvider({ children, user }: SocketProviderProps) {
   // Join workflow room
   const joinWorkflow = useCallback(
     (workflowId: string) => {
-      if (socket && user?.id) {
-        logger.info(`Joining workflow: ${workflowId}`)
-        socket.emit('join-workflow', {
-          workflowId, // Server gets user info from authenticated session
-        })
-        setCurrentWorkflowId(workflowId)
+      if (!socket || !user?.id) {
+        logger.warn('Cannot join workflow: socket or user not available')
+        return
       }
+
+      // Prevent duplicate joins to the same workflow
+      if (currentWorkflowId === workflowId) {
+        logger.info(`Already in workflow ${workflowId}, skipping join`)
+        return
+      }
+
+      // Leave current workflow first if we're in one
+      if (currentWorkflowId) {
+        logger.info(`Leaving current workflow ${currentWorkflowId} before joining ${workflowId}`)
+        socket.emit('leave-workflow')
+      }
+
+      logger.info(`Joining workflow: ${workflowId}`)
+      socket.emit('join-workflow', {
+        workflowId, // Server gets user info from authenticated session
+      })
+      setCurrentWorkflowId(workflowId)
     },
-    [socket, user]
+    [socket, user, currentWorkflowId]
   )
 
   // Leave current workflow room

apps/sim/socket-server/handlers/workflow.ts

@@ -97,8 +97,9 @@ export function setupWorkflowHandlers(
       // Broadcast updated presence list to all users in the room
       roomManager.broadcastPresenceUpdate(workflowId)
 
+      const uniqueUserCount = roomManager.getUniqueUserCount(workflowId)
       logger.info(
-        `User ${userId} (${userName}) joined workflow ${workflowId}. Room now has ${room.activeConnections} users.`
+        `User ${userId} (${userName}) joined workflow ${workflowId}. Room now has ${uniqueUserCount} unique users (${room.activeConnections} connections).`
       )
     } catch (error) {
       logger.error('Error joining workflow:', error)

apps/sim/socket-server/rooms/manager.ts

@@ -180,4 +180,20 @@ export class RoomManager {
       this.io.to(workflowId).emit('presence-update', roomPresence)
     }
   }
+
+  /**
+   * Get the number of unique users in a workflow room
+   * (not the number of socket connections)
+   */
+  getUniqueUserCount(workflowId: string): number {
+    const room = this.workflowRooms.get(workflowId)
+    if (!room) return 0
+
+    const uniqueUsers = new Set<string>()
+    room.users.forEach((presence) => {
+      uniqueUsers.add(presence.userId)
+    })
+
+    return uniqueUsers.size
+  }
 }