Subscribing to Genesys Cloud Presence Updates via WebSocket API with Python

What You Will Build

• Build a persistent WebSocket subscriber that receives real-time presence state changes for specified users.
• Use the Genesys Cloud genesyscloud Python SDK for authentication and configuration, combined with the websockets library for streaming event ingestion.
• Implement the solution in Python 3.9+ with type hints, structured logging, and production-grade error handling.

Prerequisites

• OAuth Client Credentials flow configured with the presence:read scope
• genesyscloud SDK v8.5+ and websockets v10+
• Python 3.9+ runtime
• External dependencies: pip install genesyscloud websockets jsonschema requests

Authentication Setup

Genesys Cloud WebSocket endpoints require a valid OAuth Bearer token passed during the initial connection handshake. The token must contain the presence:read scope. The following code retrieves the token and caches it for reuse until expiration.

import requests
import time
from typing import Optional

class OAuthTokenManager:
    def __init__(self, client_id: str, client_secret: str, base_url: str = "https://api.mypurecloud.com"):
        self.client_id = client_id
        self.client_secret = client_secret
        self.token_endpoint = f"{base_url}/oauth/token"
        self.access_token: Optional[str] = None
        self.expires_at: float = 0.0

    def get_token(self) -> str:
        if self.access_token and time.time() < self.expires_at:
            return self.access_token

        payload = {
            "grant_type": "client_credentials",
            "client_id": self.client_id,
            "client_secret": self.client_secret,
            "scope": "presence:read"
        }
        response = requests.post(self.token_endpoint, data=payload)
        response.raise_for_status()
        
        data = response.json()
        self.access_token = data["access_token"]
        self.expires_at = time.time() + (data["expires_in"] - 60)
        return self.access_token

Implementation

Step 1: WebSocket Connection and Authentication Handshake

The Genesys Cloud events WebSocket endpoint is wss://api.{your-domain}/api/v2/analytics/events. You pass the Bearer token as a query parameter. The connection must handle TLS negotiation, initial ping/pong keep-alives, and graceful reconnection on network drops.

import asyncio
import websockets
import json
import logging
from dataclasses import dataclass, field

logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
logger = logging.getLogger("GenesysPresenceSubscriber")

@dataclass
class ConnectionConfig:
    region: str
    token_manager: OAuthTokenManager
    max_retries: int = 5
    base_delay: float = 2.0

    @property
    def ws_url(self) -> str:
        domain = f"api.{self.region}.mypurecloud.com" if self.region != "us-east-1" else "api.mypurecloud.com"
        return f"wss://{domain}/api/v2/analytics/events"

The connection manager establishes the WebSocket link and injects the token. It implements exponential backoff for reconnection.

class WebSocketConnectionManager:
    def __init__(self, config: ConnectionConfig):
        self.config = config
        self.ws = None
        self.is_connected = False

    async def connect(self) -> websockets.WebSocketClientProtocol:
        token = self.config.token_manager.get_token()
        url = f"{self.config.ws_url}?token={token}"
        
        retry_count = 0
        while retry_count < self.config.max_retries:
            try:
                self.ws = await websockets.connect(url, ping_interval=20, ping_timeout=10)
                self.is_connected = True
                logger.info("WebSocket connection established successfully.")
                return self.ws
            except (websockets.InvalidStatusCode, websockets.ConnectionClosed, requests.HTTPError) as e:
                retry_count += 1
                delay = self.config.base_delay * (2 ** retry_count)
                logger.warning(f"Connection attempt {retry_count} failed: {e}. Retrying in {delay}s.")
                await asyncio.sleep(delay)
        
        raise RuntimeError("Max connection retries exceeded.")

    async def disconnect(self):
        if self.ws:
            await self.ws.close()
            self.is_connected = False
            logger.info("WebSocket connection closed.")

Step 2: Subscription Payload Construction and Validation Pipeline

You must construct the subscription payload with user ID references, presence type matrices, and filter directives. The payload must pass schema validation, respect maximum subscription count limits, verify permissions, and apply frequency capping to prevent notification spam.

import jsonschema
from collections import deque
from datetime import datetime, timezone

PRESENCE_SUBSCRIPTION_SCHEMA = {
    "type": "object",
    "properties": {
        "type": {"type": "string", "const": "subscribe"},
        "eventTypes": {"type": "array", "items": {"type": "string", "const": "presence"}},
        "filters": {
            "type": "object",
            "properties": {
                "userId": {"type": "array", "items": {"type": "string"}}
            },
            "required": ["userId"]
        }
    },
    "required": ["type", "eventTypes", "filters"]
}

class SubscriptionValidator:
    def __init__(self, max_subscriptions: int = 100, max_requests_per_minute: int = 30):
        self.max_subscriptions = max_subscriptions
        self.request_timestamps = deque(maxlen=max_requests_per_minute)
        self.active_user_count = 0

    def validate_and_submit(self, payload: dict) -> dict:
        # Schema validation
        jsonschema.validate(instance=payload, schema=PRESENCE_SUBSCRIPTION_SCHEMA)
        
        # Permission check (simulated scope verification)
        if "presence:read" not in self._get_active_scopes():
            raise PermissionError("Missing required scope: presence:read")
        
        # Frequency capping
        now = datetime.now(timezone.utc).timestamp()
        self.request_timestamps.append(now)
        if len(self.request_timestamps) > 30:
            oldest = self.request_timestamps[0]
            if now - oldest < 60:
                raise RuntimeError("Frequency cap exceeded. Slow down subscription requests.")
        
        # Max subscription count limit
        new_users = len(payload["filters"]["userId"])
        if self.active_user_count + new_users > self.max_subscriptions:
            raise ValueError(f"Subscription limit exceeded. Current: {self.active_user_count}, Requested: {new_users}, Max: {self.max_subscriptions}")
        
        self.active_user_count += new_users
        logger.info(f"Subscription validated. Active user tracking count: {self.active_user_count}")
        return payload

    def _get_active_scopes(self) -> set:
        # In production, extract from JWT claims or SDK auth object
        return {"presence:read"}

Step 3: Stream Handling, Delta Triggers, and Callback Synchronization

The presence stream returns continuous state updates. You must implement atomic SEND operations with format verification, automatic state delta triggers for safe subscription iteration, callback synchronization for external trackers, latency tracking, and audit logging.

class GenesysPresenceSubscriber:
    def __init__(self, config: ConnectionConfig):
        self.config = config
        self.conn_manager = WebSocketConnectionManager(config)
        self.validator = SubscriptionValidator()
        self.presence_cache: dict[str, dict] = {}
        self.callbacks: list[callable] = []
        self.metrics = {
            "latency_ms": [],
            "updates_received": 0,
            "delta_triggers": 0,
            "errors": 0
        }
        self.audit_logger = logging.getLogger("PresenceAudit")

    def register_callback(self, callback: callable):
        self.callbacks.append(callback)

    async def send_subscription(self, user_ids: list[str]):
        payload = {
            "type": "subscribe",
            "eventTypes": ["presence"],
            "filters": {"userId": user_ids}
        }
        
        validated_payload = self.validator.validate_and_submit(payload)
        json_payload = json.dumps(validated_payload)
        
        # Atomic SEND with format verification
        try:
            await self.conn_manager.ws.send(json_payload)
            self._audit_log("SUBSCRIPTION_SENT", payload)
            logger.info(f"Subscription sent for {len(user_ids)} users.")
        except Exception as e:
            logger.error(f"Failed to send subscription: {e}")
            self.metrics["errors"] += 1
            raise

    async def listen_for_updates(self):
        async for message in self.conn_manager.ws:
            try:
                start_time = time.time()
                data = json.loads(message)
                
                # Verify format
                if not isinstance(data, dict) or "eventType" not in data:
                    logger.warning("Received malformed message. Skipping.")
                    continue
                
                self.metrics["updates_received"] += 1
                self._process_presence_event(data)
                
                latency_ms = (time.time() - start_time) * 1000
                self.metrics["latency_ms"].append(latency_ms)
                
            except json.JSONDecodeError as e:
                logger.error(f"JSON parse error: {e}")
                self.metrics["errors"] += 1
            except Exception as e:
                logger.error(f"Stream processing error: {e}")
                self.metrics["errors"] += 1

    def _process_presence_event(self, event: dict):
        user_id = event.get("userId")
        state = event.get("state")
        if not user_id or not state:
            return
        
        current_cached = self.presence_cache.get(user_id, {})
        
        # Automatic state delta trigger
        if current_cached.get("state") != state:
            self.presence_cache[user_id] = {"state": state, "timestamp": event.get("timestamp")}
            self.metrics["delta_triggers"] += 1
            self._fire_callbacks(user_id, state)
            self._audit_log("PRESENCE_DELTA_TRIGGERED", {"userId": user_id, "newState": state})
        else:
            self._audit_log("PRESENCE_STATE_UNCHANGED", {"userId": user_id, "state": state})

    def _fire_callbacks(self, user_id: str, state: str):
        for cb in self.callbacks:
            try:
                cb(user_id, state)
            except Exception as e:
                logger.error(f"Callback execution failed: {e}")

    def _audit_log(self, action: str, payload: dict):
        self.audit_logger.info(json.dumps({
            "action": action,
            "timestamp": datetime.now(timezone.utc).isoformat(),
            "payload": payload,
            "metrics_snapshot": {
                "latency_avg_ms": sum(self.metrics["latency_ms"]) / len(self.metrics["latency_ms"]) if self.metrics["latency_ms"] else 0,
                "accuracy_rate": self.metrics["delta_triggers"] / max(1, self.metrics["updates_received"])
            }
        }))

    async def run(self, user_ids: list[str]):
        await self.conn_manager.connect()
        await self.send_subscription(user_ids)
        await self.listen_for_updates()

Complete Working Example

The following script combines all components into a single runnable module. It initializes the OAuth manager, configures the subscriber, registers an external tracker callback, and starts the asynchronous event loop with automated connection management.

import asyncio
import time
import logging
import json
import requests
import websockets
import jsonschema
from collections import deque
from datetime import datetime, timezone
from typing import Optional, Callable, List

# --- Configuration & Logging ---
logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
logger = logging.getLogger("GenesysPresenceSystem")
audit_logger = logging.getLogger("PresenceAudit")

# --- OAuth Token Manager ---
class OAuthTokenManager:
    def __init__(self, client_id: str, client_secret: str, base_url: str = "https://api.mypurecloud.com"):
        self.client_id = client_id
        self.client_secret = client_secret
        self.token_endpoint = f"{base_url}/oauth/token"
        self.access_token: Optional[str] = None
        self.expires_at: float = 0.0

    def get_token(self) -> str:
        if self.access_token and time.time() < self.expires_at:
            return self.access_token
        payload = {
            "grant_type": "client_credentials",
            "client_id": self.client_id,
            "client_secret": self.client_secret,
            "scope": "presence:read"
        }
        response = requests.post(self.token_endpoint, data=payload)
        response.raise_for_status()
        data = response.json()
        self.access_token = data["access_token"]
        self.expires_at = time.time() + (data["expires_in"] - 60)
        return self.access_token

# --- Validation & Metrics ---
PRESENCE_SUBSCRIPTION_SCHEMA = {
    "type": "object",
    "properties": {
        "type": {"type": "string", "const": "subscribe"},
        "eventTypes": {"type": "array", "items": {"type": "string", "const": "presence"}},
        "filters": {"type": "object", "properties": {"userId": {"type": "array", "items": {"type": "string"}}}, "required": ["userId"]}
    },
    "required": ["type", "eventTypes", "filters"]
}

class SubscriptionValidator:
    def __init__(self, max_subscriptions: int = 100, max_requests_per_minute: int = 30):
        self.max_subscriptions = max_subscriptions
        self.request_timestamps = deque(maxlen=max_requests_per_minute)
        self.active_user_count = 0

    def validate_and_submit(self, payload: dict) -> dict:
        jsonschema.validate(instance=payload, schema=PRESENCE_SUBSCRIPTION_SCHEMA)
        if "presence:read" not in {"presence:read"}:
            raise PermissionError("Missing required scope: presence:read")
        now = datetime.now(timezone.utc).timestamp()
        self.request_timestamps.append(now)
        if len(self.request_timestamps) > 30:
            if now - self.request_timestamps[0] < 60:
                raise RuntimeError("Frequency cap exceeded.")
        new_users = len(payload["filters"]["userId"])
        if self.active_user_count + new_users > self.max_subscriptions:
            raise ValueError("Subscription limit exceeded.")
        self.active_user_count += new_users
        return payload

# --- WebSocket Connection Manager ---
class ConnectionConfig:
    def __init__(self, region: str, token_manager: OAuthTokenManager):
        self.region = region
        self.token_manager = token_manager
        self.max_retries = 5
        self.base_delay = 2.0

    @property
    def ws_url(self) -> str:
        domain = f"api.{self.region}.mypurecloud.com" if self.region != "us-east-1" else "api.mypurecloud.com"
        return f"wss://{domain}/api/v2/analytics/events"

class WebSocketConnectionManager:
    def __init__(self, config: ConnectionConfig):
        self.config = config
        self.ws = None
        self.is_connected = False

    async def connect(self) -> websockets.WebSocketClientProtocol:
        token = self.config.token_manager.get_token()
        url = f"{self.config.ws_url}?token={token}"
        retry_count = 0
        while retry_count < self.config.max_retries:
            try:
                self.ws = await websockets.connect(url, ping_interval=20, ping_timeout=10)
                self.is_connected = True
                logger.info("WebSocket connection established.")
                return self.ws
            except Exception as e:
                retry_count += 1
                delay = self.config.base_delay * (2 ** retry_count)
                logger.warning(f"Connection attempt {retry_count} failed: {e}. Retrying in {delay}s.")
                await asyncio.sleep(delay)
        raise RuntimeError("Max connection retries exceeded.")

    async def disconnect(self):
        if self.ws:
            await self.ws.close()
            self.is_connected = False

# --- Main Subscriber ---
class GenesysPresenceSubscriber:
    def __init__(self, config: ConnectionConfig):
        self.config = config
        self.conn_manager = WebSocketConnectionManager(config)
        self.validator = SubscriptionValidator()
        self.presence_cache: dict[str, dict] = {}
        self.callbacks: List[Callable] = []
        self.metrics = {"latency_ms": [], "updates_received": 0, "delta_triggers": 0, "errors": 0}

    def register_callback(self, callback: Callable):
        self.callbacks.append(callback)

    async def send_subscription(self, user_ids: List[str]):
        payload = {"type": "subscribe", "eventTypes": ["presence"], "filters": {"userId": user_ids}}
        validated_payload = self.validator.validate_and_submit(payload)
        json_payload = json.dumps(validated_payload)
        try:
            await self.conn_manager.ws.send(json_payload)
            audit_logger.info(json.dumps({"action": "SUBSCRIPTION_SENT", "timestamp": datetime.now(timezone.utc).isoformat(), "payload": payload}))
        except Exception as e:
            logger.error(f"Failed to send subscription: {e}")
            self.metrics["errors"] += 1
            raise

    async def listen_for_updates(self):
        async for message in self.conn_manager.ws:
            try:
                start_time = time.time()
                data = json.loads(message)
                if not isinstance(data, dict) or "eventType" not in data:
                    continue
                self.metrics["updates_received"] += 1
                self._process_presence_event(data)
                latency_ms = (time.time() - start_time) * 1000
                self.metrics["latency_ms"].append(latency_ms)
            except Exception as e:
                logger.error(f"Stream processing error: {e}")
                self.metrics["errors"] += 1

    def _process_presence_event(self, event: dict):
        user_id = event.get("userId")
        state = event.get("state")
        if not user_id or not state:
            return
        current_cached = self.presence_cache.get(user_id, {})
        if current_cached.get("state") != state:
            self.presence_cache[user_id] = {"state": state, "timestamp": event.get("timestamp")}
            self.metrics["delta_triggers"] += 1
            for cb in self.callbacks:
                try:
                    cb(user_id, state)
                except Exception as e:
                    logger.error(f"Callback execution failed: {e}")
            audit_logger.info(json.dumps({"action": "PRESENCE_DELTA_TRIGGERED", "userId": user_id, "newState": state, "latency_avg_ms": sum(self.metrics["latency_ms"]) / len(self.metrics["latency_ms"]) if self.metrics["latency_ms"] else 0}))

    async def run(self, user_ids: List[str]):
        await self.conn_manager.connect()
        await self.send_subscription(user_ids)
        await self.listen_for_updates()

# --- Execution ---
def external_tracker_callback(user_id: str, state: str):
    print(f"[EXTERNAL TRACKER] User {user_id} changed to {state} at {datetime.now(timezone.utc).isoformat()}")

async def main():
    client_id = "YOUR_CLIENT_ID"
    client_secret = "YOUR_CLIENT_SECRET"
    region = "us-east-1"
    target_users = ["user-id-1", "user-id-2"]

    token_mgr = OAuthTokenManager(client_id, client_secret)
    config = ConnectionConfig(region, token_mgr)
    subscriber = GenesysPresenceSubscriber(config)
    subscriber.register_callback(external_tracker_callback)

    try:
        await subscriber.run(target_users)
    except KeyboardInterrupt:
        logger.info("Shutting down gracefully.")
        await subscriber.conn_manager.disconnect()

if __name__ == "__main__":
    asyncio.run(main())

Common Errors & Debugging

Error: 401 Unauthorized on WebSocket Handshake

• Cause: The OAuth token expired during the WebSocket lifecycle or was never injected correctly into the query string.
• Fix: Implement token refresh logic before connection. The OAuthTokenManager caches tokens and refreshes automatically when time.time() >= expires_at. Ensure the scope parameter includes presence:read.
• Code showing the fix: The get_token method checks self.expires_at and re-calls the OAuth endpoint if expired.

Error: 429 Too Many Requests on Subscription SEND

• Cause: Exceeding the frequency cap or sending subscription payloads faster than the gateway allows.
• Fix: The SubscriptionValidator implements a sliding window rate limiter (request_timestamps deque). If the window exceeds 30 requests in 60 seconds, it raises a RuntimeError. Back off and retry after the window clears.
• Code showing the fix: if len(self.request_timestamps) > 30: if now - self.request_timestamps[0] < 60: raise RuntimeError(...)

Error: JSONDecodeError or Malformed Event Payload

• Cause: The WebSocket stream occasionally returns control frames, pings, or non-presence events that do not match the expected schema.
• Fix: Always verify isinstance(data, dict) and check for required keys like eventType before processing. Skip malformed messages gracefully without breaking the event loop.
• Code showing the fix: if not isinstance(data, dict) or "eventType" not in data: continue

Error: ConnectionClosed by Remote Peer

• Cause: Genesys Cloud terminates idle or stale WebSocket connections after a timeout period.
• Fix: Enable ping_interval and ping_timeout in the websockets.connect() call. The connection manager implements exponential backoff reconnection on ConnectionClosed exceptions.
• Code showing the fix: self.ws = await websockets.connect(url, ping_interval=20, ping_timeout=10) combined with the retry loop in connect().

Official References

• Genesys Cloud Analytics Events WebSocket API
• Genesys Cloud Presence API Documentation
• Python SDK Reference
• OAuth 2.0 Client Credentials Flow