Implementing Real-Time Notification Toasts for Incoming Genesys Cloud Interactions in a Custom Agent Desktop Using WebSockets and React

What You Will Build

• This code establishes a persistent WebSocket connection to Genesys Cloud routing events and displays a dismissible toast notification when a conversation enters the ringing state.
• This implementation uses the Genesys Cloud WebSocket API for routing events (/api/v2/routing/events) and standard OAuth 2.0 token authentication.
• This tutorial covers JavaScript with React 18, modern hooks, and native WebSocket handling without external UI libraries.

Prerequisites

• OAuth 2.0 client credentials grant type registered in the Genesys Cloud Admin Console
• Required scopes: routing:conversation:read, routing:queue:read, user:read
• Genesys Cloud API version v2
• Node.js 18+ and npm 9+
• React 18+ project initialized with create-react-app or Vite
• No external dependencies required beyond React core

Authentication Setup

Genesys Cloud WebSocket endpoints require an active OAuth access token passed during the handshake. The token must contain the routing:conversation:read scope to receive conversation state changes. Tokens expire after 3600 seconds. You must implement a background refresh mechanism to avoid connection drops.

The following function retrieves a token using the client credentials flow. It includes retry logic for 429 Too Many Requests responses, which occur when you exceed the OAuth rate limit of 10 requests per second per client.

import { useState, useEffect, useCallback } from 'react';

const OAUTH_ENDPOINT = 'https://api.mypurecloud.com/oauth/token';
const WS_ENDPOINT = 'wss://api.mypurecloud.com/api/v2/routing/events';

async function fetchAccessToken(clientId, clientSecret) {
  const payload = new URLSearchParams();
  payload.append('grant_type', 'client_credentials');
  payload.append('client_id', clientId);
  payload.append('client_secret', clientSecret);

  const maxRetries = 3;
  let attempt = 0;

  while (attempt < maxRetries) {
    const response = await fetch(OAUTH_ENDPOINT, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: payload
    });

    if (response.status === 429) {
      const retryAfter = parseInt(response.headers.get('Retry-After') || '2', 10);
      await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
      attempt++;
      continue;
    }

    if (!response.ok) {
      const errorBody = await response.text();
      throw new Error(`OAuth failed with ${response.status}: ${errorBody}`);
    }

    const data = await response.json();
    return {
      token: data.access_token,
      expiresAt: Date.now() + (data.expires_in * 1000)
    };
  }

  throw new Error('OAuth token fetch failed after retries');
}

You must cache the token and refresh it before expiration. The refresh interval should trigger 30 seconds before the expires_in value lapses to account for network latency.

Implementation

Step 1: WebSocket Connection & Handshake

The Genesys Cloud routing events WebSocket endpoint accepts the access token as a query parameter. You must construct the WebSocket URL dynamically and attach the token. The connection remains open indefinitely. Genesys Cloud pushes JSON-formatted events over this channel.

You must handle connection closures gracefully. WebSocket closures with code 1000 indicate normal termination. Closures with 1006 or 4001 indicate network failures or token expiration. You must implement exponential backoff reconnection to prevent thundering herd scenarios.

function useGenesysWebSocket(token) {
  const [connectionStatus, setConnectionStatus] = useState('disconnected');
  let ws = null;
  let reconnectTimeout = null;
  let reconnectAttempts = 0;

  const connect = useCallback(() => {
    if (!token) return;

    const wsUrl = `${WS_ENDPOINT}?access_token=${encodeURIComponent(token)}`;
    ws = new WebSocket(wsUrl);

    ws.onopen = () => {
      setConnectionStatus('connected');
      reconnectAttempts = 0;
      console.log('WebSocket connected to Genesys Cloud routing events');
    };

    ws.onclose = (event) => {
      setConnectionStatus('disconnected');
      console.warn(`WebSocket closed with code ${event.code}`);
      
      if (event.code === 1000) return;

      const backoffMs = Math.min(1000 * Math.pow(2, reconnectAttempts), 30000);
      reconnectAttempts++;
      reconnectTimeout = setTimeout(connect, backoffMs);
    };

    ws.onerror = (error) => {
      console.error('WebSocket error:', error);
      ws.close();
    };

    return ws;
  }, [token]);

  useEffect(() => {
    const socket = connect();
    return () => {
      if (reconnectTimeout) clearTimeout(reconnectTimeout);
      if (socket) socket.close(1000, 'Component unmounting');
    };
  }, [connect]);

  return { connectionStatus, ws };
}

The ws.onerror handler does not close the socket explicitly because the browser fires onerror before onclose. Relying on onclose for reconnection logic prevents duplicate connection attempts.

Step 2: Event Filtering & State Management

Genesys Cloud routing events contain multiple event types. You must filter for routing.conversation.event and inspect the conversation.state field. Incoming interactions transition through queued, alerting, and ringing states. You only want to trigger a toast when the state becomes ringing.

You must deduplicate events. Genesys Cloud may send duplicate state updates if the agent desktop reconnects or if the routing engine retries. You will track active toast IDs to prevent duplicate notifications for the same conversation.

const toastState = {
  toasts: [],
  activeConversationIds: new Set()
};

function processRoutingEvent(eventData) {
  if (eventData.eventType !== 'routing.conversation.event') return;

  const { conversation, participants } = eventData;
  if (!conversation || conversation.state !== 'ringing') return;

  const conversationId = conversation.id;
  
  if (toastState.activeConversationIds.has(conversationId)) return;

  const primaryParticipant = participants?.find(p => p.role === 'agent') || participants?.[0];
  const callerName = primaryParticipant?.name || 'Unknown Caller';
  const mediaType = conversation.mediaType || 'voice';

  const newToast = {
    id: `toast-${Date.now()}-${Math.random().toString(36).slice(2)}`,
    conversationId,
    callerName,
    mediaType,
    timestamp: new Date().toLocaleTimeString()
  };

  toastState.activeConversationIds.add(conversationId);
  return newToast;
}

The deduplication set prevents multiple toasts if the routing engine emits rapid ringing updates during the initial alert phase. You will clear the set entry when the toast is dismissed or when the conversation state changes to connected or abandoned.

Step 3: Toast Rendering & Dismissal Logic

You will manage toast visibility using React state. Each toast auto-dismisses after 8 seconds. You must clean up the deduplication set when a toast is removed to allow future ringing events for the same conversation to trigger a new notification.

The following hook manages the toast array and exposes actions to the UI layer.

function useToastManager() {
  const [toasts, setToasts] = useState([]);

  const addToast = useCallback((toast) => {
    setToasts(prev => [...prev, toast]);
    
    setTimeout(() => {
      dismissToast(toast.id);
    }, 8000);
  }, []);

  const dismissToast = useCallback((id) => {
    setToasts(prev => {
      const target = prev.find(t => t.id === id);
      if (target) {
        toastState.activeConversationIds.delete(target.conversationId);
      }
      return prev.filter(t => t.id !== id);
    });
  }, []);

  return { toasts, addToast, dismissToast };
}

You will render the toasts using absolute positioning and CSS transitions. The markup must be accessible. You will use role="status" and aria-live="polite" to ensure screen readers announce incoming notifications without interrupting the user.

Complete Working Example

The following file contains the complete, runnable React component. Save it as GenesysIncomingToast.jsx in your src/ directory. Replace YOUR_CLIENT_ID and YOUR_CLIENT_SECRET with valid credentials.

import React, { useState, useEffect, useCallback, useRef } from 'react';

const OAUTH_ENDPOINT = 'https://api.mypurecloud.com/oauth/token';
const WS_ENDPOINT = 'wss://api.mypurecloud.com/api/v2/routing/events';

const GENESYS_CLIENT_ID = 'YOUR_CLIENT_ID';
const GENESYS_CLIENT_SECRET = 'YOUR_CLIENT_SECRET';

const toastState = {
  activeConversationIds: new Set()
};

async function fetchAccessToken() {
  const payload = new URLSearchParams();
  payload.append('grant_type', 'client_credentials');
  payload.append('client_id', GENESYS_CLIENT_ID);
  payload.append('client_secret', GENESYS_CLIENT_SECRET);

  const maxRetries = 3;
  let attempt = 0;

  while (attempt < maxRetries) {
    const response = await fetch(OAUTH_ENDPOINT, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: payload
    });

    if (response.status === 429) {
      const retryAfter = parseInt(response.headers.get('Retry-After') || '2', 10);
      await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
      attempt++;
      continue;
    }

    if (!response.ok) {
      const errorBody = await response.text();
      throw new Error(`OAuth failed with ${response.status}: ${errorBody}`);
    }

    const data = await response.json();
    return {
      token: data.access_token,
      expiresAt: Date.now() + (data.expires_in * 1000)
    };
  }

  throw new Error('OAuth token fetch failed after retries');
}

function GenesysIncomingToast() {
  const [toasts, setToasts] = useState([]);
  const [status, setStatus] = useState('connecting');
  const wsRef = useRef(null);
  const reconnectTimeoutRef = useRef(null);
  const reconnectAttemptsRef = useRef(0);

  const dismissToast = useCallback((id) => {
    setToasts(prev => {
      const target = prev.find(t => t.id === id);
      if (target) {
        toastState.activeConversationIds.delete(target.conversationId);
      }
      return prev.filter(t => t.id !== id);
    });
  }, []);

  const addToast = useCallback((toast) => {
    setToasts(prev => [...prev, toast]);
    setTimeout(() => dismissToast(toast.id), 8000);
  }, [dismissToast]);

  const processEvent = useCallback((rawData) => {
    try {
      const eventData = JSON.parse(rawData);
      if (eventData.eventType !== 'routing.conversation.event') return;
      
      const { conversation, participants } = eventData;
      if (!conversation || conversation.state !== 'ringing') return;

      const conversationId = conversation.id;
      if (toastState.activeConversationIds.has(conversationId)) return;

      const primaryParticipant = participants?.find(p => p.role === 'agent') || participants?.[0];
      const callerName = primaryParticipant?.name || 'Unknown Caller';
      const mediaType = conversation.mediaType || 'voice';

      const newToast = {
        id: `toast-${Date.now()}-${Math.random().toString(36).slice(2)}`,
        conversationId,
        callerName,
        mediaType,
        timestamp: new Date().toLocaleTimeString()
      };

      toastState.activeConversationIds.add(conversationId);
      addToast(newToast);
    } catch (error) {
      console.error('Failed to parse routing event:', error);
    }
  }, [addToast]);

  const connectWebSocket = useCallback(async () => {
    try {
      const auth = await fetchAccessToken();
      const wsUrl = `${WS_ENDPOINT}?access_token=${encodeURIComponent(auth.token)}`;
      
      wsRef.current = new WebSocket(wsUrl);

      wsRef.current.onopen = () => {
        setStatus('connected');
        reconnectAttemptsRef.current = 0;
      };

      wsRef.current.onmessage = (event) => processEvent(event.data);

      wsRef.current.onclose = (event) => {
        setStatus('disconnected');
        if (event.code === 1000) return;

        const backoffMs = Math.min(1000 * Math.pow(2, reconnectAttemptsRef.current), 30000);
        reconnectAttemptsRef.current++;
        reconnectTimeoutRef.current = setTimeout(connectWebSocket, backoffMs);
      };

      wsRef.current.onerror = (error) => {
        console.error('WebSocket error occurred');
        wsRef.current.close();
      };

      // Token refresh scheduler
      const refreshInterval = setInterval(async () => {
        if (Date.now() + 30000 >= auth.expiresAt) {
          try {
            const newAuth = await fetchAccessToken();
            if (wsRef.current?.readyState === WebSocket.OPEN) {
              wsRef.current.close();
              // Reconnection handled by onclose -> setTimeout -> connectWebSocket
              // We manually trigger by updating a ref or calling connectWebSocket directly
              // For simplicity, we rely on the token being passed in the next reconnect
              // In production, you would store the token in a shared state/context
            }
          } catch (err) {
            console.error('Token refresh failed:', err);
          }
        }
      }, 60000);

      return () => clearInterval(refreshInterval);
    } catch (error) {
      console.error('Authentication failed:', error);
      setStatus('error');
      setTimeout(connectWebSocket, 5000);
    }
  }, [processEvent]);

  useEffect(() => {
    connectWebSocket();
    return () => {
      if (reconnectTimeoutRef.current) clearTimeout(reconnectTimeoutRef.current);
      if (wsRef.current) wsRef.current.close(1000, 'Component unmounting');
    };
  }, [connectWebSocket]);

  return (
    <div style={{ position: 'fixed', top: 20, right: 20, zIndex: 9999, display: 'flex', flexDirection: 'column', gap: 12 }}>
      {toasts.map(toast => (
        <div 
          key={toast.id}
          role="status"
          aria-live="polite"
          style={{
            background: '#ffffff',
            borderLeft: '4px solid #007bff',
            boxShadow: '0 4px 12px rgba(0,0,0,0.15)',
            padding: '16px',
            borderRadius: '4px',
            minWidth: 320,
            display: 'flex',
            justifyContent: 'space-between',
            alignItems: 'center',
            fontSize: 14,
            fontFamily: 'system-ui, sans-serif'
          }}
        >
          <div>
            <div style={{ fontWeight: 600, marginBottom: 4 }}>
              {toast.mediaType.toUpperCase()} CALL INCOMING
            </div>
            <div style={{ color: '#555' }}>From: {toast.callerName}</div>
            <div style={{ fontSize: 12, color: '#888', marginTop: 4 }}>
              {toast.timestamp}
            </div>
          </div>
          <button 
            onClick={() => dismissToast(toast.id)}
            style={{
              background: 'transparent',
              border: 'none',
              cursor: 'pointer',
              fontSize: 18,
              padding: '4px 8px'
            }}
            aria-label="Dismiss notification"
          >
            &times;
          </button>
        </div>
      ))}
      <div style={{ fontSize: 12, color: '#666', textAlign: 'right', marginTop: 8 }}>
        Status: {status}
      </div>
    </div>
  );
}

export default GenesysIncomingToast;

You must import and mount GenesysIncomingToast in your root layout. The component manages its own lifecycle. You should wrap the OAuth credentials in environment variables in production.

Common Errors & Debugging

Error: 401 Unauthorized or 403 Forbidden on WebSocket Handshake

• What causes it: The access token lacks the routing:conversation:read scope, or the token has expired. Genesys Cloud validates scopes during the WebSocket handshake.
• How to fix it: Verify your OAuth client configuration in the Genesys Cloud Admin Console. Add routing:conversation:read to the client scopes. Ensure your token refresh logic fires before expiration.
• Code showing the fix: The fetchAccessToken function includes retry logic. You must log the token payload to verify the scope field contains the required permissions.

Error: 429 Too Many Requests on OAuth Endpoint

• What causes it: You are requesting tokens faster than Genesys Cloud allows. The OAuth endpoint enforces strict rate limits per client.
• How to fix it: Implement exponential backoff. Cache the token in localStorage or a secure backend session. Only request a new token when the current one expires.
• Code showing the fix: The fetchAccessToken function checks response.status === 429, reads the Retry-After header, and delays the next attempt.

Error: WebSocket Closure Code 1006 or 4001

• What causes it: Network instability, proxy interference, or server-side token invalidation. Genesys Cloud closes connections when tokens expire without warning.
• How to fix it: Implement automatic reconnection with backoff. The onclose handler in the complete example calculates Math.min(1000 * Math.pow(2, attempts), 30000) to prevent server overload.
• Code showing the fix: The reconnectTimeoutRef and reconnectAttemptsRef track state across renders. The setTimeout schedules reconnection. You must clear the timeout on unmount.

Error: Duplicate Toast Notifications

• What causes it: Genesys Cloud routing engine may emit multiple ringing events during the initial alert phase or after network reconnection.
• How to fix it: Track active conversation IDs in a Set. Filter out events for conversations already displayed. Clear the set entry when the toast is dismissed.
• Code showing the fix: The toastState.activeConversationIds Set prevents duplicates. The dismissToast function removes the ID to allow future events.

Official References

• Genesys Cloud WebSocket API for Routing Events
• Genesys Cloud OAuth 2.0 Authentication
• Genesys Cloud Conversation Event Schema
• React WebSocket Best Practices