Archiving NICE CXone Completed Work Items via Task Management API with Python
What You Will Build
A production-grade Python archival service that identifies completed CXone tasks, validates retention constraints, constructs atomic PATCH payloads with cold-store directives, and synchronizes archival events with external systems while tracking latency and generating audit logs.
This tutorial uses the NICE CXone Task Management API (/api/v2/tasks) and OAuth 2.0 Client Credentials flow.
The implementation covers Python 3.9+ using httpx, pydantic, and standard library logging.
Prerequisites
- CXone OAuth2 client application with
task:readandtask:writescopes - CXone API v2 endpoint region (e.g.,
api-us-1.cxone.com) - Python 3.9+ runtime
- External dependencies:
httpx>=0.25.0,pydantic>=2.0.0,python-dotenv>=1.0.0
Authentication Setup
CXone uses OAuth 2.0 for API authentication. The client credentials flow requires your client ID, client secret, and tenant ID. Token caching prevents unnecessary refresh calls, and retry logic handles transient 429 rate limits.
import os
import time
import httpx
from typing import Optional
class CXoneAuthManager:
def __init__(self, client_id: str, client_secret: str, tenant_id: str, region: str = "us-1"):
self.client_id = client_id
self.client_secret = client_secret
self.tenant_id = tenant_id
self.token_endpoint = f"https://login-{region}.cxone.com/oauth2/token"
self._token: Optional[str] = None
self._expires_at: float = 0.0
def _request_token(self) -> str:
payload = {
"grant_type": "client_credentials",
"client_id": self.client_id,
"client_secret": self.client_secret,
"tenant_id": self.tenant_id,
"scope": "task:read task:write"
}
response = httpx.post(self.token_endpoint, data=payload, timeout=10.0)
response.raise_for_status()
data = response.json()
self._token = data["access_token"]
self._expires_at = time.time() + data["expires_in"] - 60
return self._token
def get_token(self) -> str:
if not self._token or time.time() >= self._expires_at:
return self._request_token()
return self._token
Implementation
Step 1: Task Discovery & Filtering
Retrieve completed tasks using the CXone Task API. The endpoint supports pagination via page and pageSize parameters. Filter for tasks matching the Completed status to prepare for archival.
from typing import List, Dict, Any
class CXoneTaskFetcher:
def __init__(self, auth: CXoneAuthManager, base_url: str):
self.auth = auth
self.base_url = base_url.rstrip("/")
def fetch_completed_tasks(self, page: int = 1, page_size: int = 100) -> Dict[str, Any]:
token = self.auth.get_token()
headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
params = {
"page": page,
"pageSize": page_size,
"status": "Completed",
"expand": "properties"
}
url = f"{self.base_url}/api/v2/tasks"
response = httpx.get(url, headers=headers, params=params, timeout=30.0)
response.raise_for_status()
return response.json()
Step 2: Validation & Payload Construction
Validate each task against retention constraints and maximum archive tier limits. Construct the archival payload containing taskRef, statusMatrix, and coldStoreDirective. Calculate lifecycle duration and estimate compression ratio based on payload metadata.
import json
from datetime import datetime, timezone
from pydantic import BaseModel, field_validator
class ArchiveConstraints(BaseModel):
max_retention_days: int = 365
max_archive_tier: int = 3
min_compression_ratio: float = 0.6
def calculate_lifecycle_days(created_at: str, completed_at: str) -> int:
created = datetime.fromisoformat(created_at.replace("Z", "+00:00"))
completed = datetime.fromisoformat(completed_at.replace("Z", "+00:00"))
return (completed - created).days
def estimate_compression_ratio(original_size: int, compressed_size: int) -> float:
if original_size == 0:
return 0.0
return compressed_size / original_size
def build_archive_payload(task: Dict[str, Any], constraints: ArchiveConstraints) -> Dict[str, Any]:
lifecycle_days = calculate_lifecycle_days(task["createdAt"], task["completedAt"])
if lifecycle_days > constraints.max_retention_days:
raise ValueError(f"Task exceeds retention constraint: {lifecycle_days} > {constraints.max_retention_days}")
original_size = len(json.dumps(task, separators=(",", ":")))
compressed_size = int(original_size * constraints.min_compression_ratio)
ratio = estimate_compression_ratio(original_size, compressed_size)
payload = {
"taskRef": task["id"],
"statusMatrix": {
"current": task["status"],
"target": "Archived",
"transitionTimestamp": datetime.now(timezone.utc).isoformat()
},
"coldStoreDirective": {
"tier": min(constraints.max_archive_tier, 3),
"compressionRatio": ratio,
"lifecycleDays": lifecycle_days,
"preserveHistory": True,
"triggerAutoCompress": ratio < 0.7
},
"properties": {
"archiveVersion": "1.0",
"archivedBy": "cxone-task-archiver",
"originalPayloadSize": original_size
}
}
return payload
Step 3: Dependency & Lock Verification
Verify active dependencies and lock conflicts before archival. CXone tasks expose a lock field. The pipeline checks for existing locks and validates that no active subtasks or workflows depend on the target task.
def verify_lock_conflict(task: Dict[str, Any]) -> bool:
if task.get("lock"):
return True
return False
def check_active_dependencies(task: Dict[str, Any]) -> bool:
dependencies = task.get("properties", {}).get("dependencies", [])
for dep in dependencies:
if dep.get("status") in ("Active", "InProgress"):
return True
return False
Step 4: Atomic PATCH & Cold-Store Iteration
Execute the archival operation using an atomic HTTP PATCH request. Implement retry logic for 429 responses, verify response format, and trigger automatic compression iterations until the cold-store directive is satisfied.
import time
import logging
logger = logging.getLogger("cxone_archiver")
class CXoneTaskArchiver:
def __init__(self, auth: CXoneAuthManager, base_url: str, constraints: ArchiveConstraints):
self.auth = auth
self.base_url = base_url.rstrip("/")
self.constraints = constraints
self.metrics = {"total": 0, "success": 0, "failed": 0, "total_latency_ms": 0}
def _retry_patch(self, url: str, payload: Dict[str, Any], max_retries: int = 3) -> httpx.Response:
token = self.auth.get_token()
headers = {
"Authorization": f"Bearer {token}",
"Content-Type": "application/json",
"Accept": "application/json"
}
for attempt in range(max_retries):
start_time = time.perf_counter()
try:
response = httpx.patch(url, headers=headers, json=payload, timeout=30.0)
latency_ms = (time.perf_counter() - start_time) * 1000
self.metrics["total_latency_ms"] += latency_ms
if response.status_code == 429:
retry_after = int(response.headers.get("Retry-After", 2 ** attempt))
logger.warning(f"Rate limited (429). Retrying in {retry_after}s (attempt {attempt + 1})")
time.sleep(retry_after)
continue
response.raise_for_status()
return response
except httpx.HTTPStatusError as e:
if e.response.status_code == 409:
raise RuntimeError(f"Lock conflict on task: {e.response.text}")
raise
raise RuntimeError("Max retries exceeded for 429 rate limit")
def archive_task(self, task: Dict[str, Any], webhook_url: Optional[str] = None) -> Dict[str, Any]:
self.metrics["total"] += 1
if verify_lock_conflict(task):
raise RuntimeError(f"Task {task['id']} is locked. Cannot archive.")
if check_active_dependencies(task):
raise RuntimeError(f"Task {task['id']} has active dependencies. Cannot archive.")
payload = build_archive_payload(task, self.constraints)
url = f"{self.base_url}/api/v2/tasks/{task['id']}"
response = self._retry_patch(url, payload)
result = response.json()
if result.get("status") != "Archived":
raise RuntimeError(f"Format verification failed. Expected status 'Archived', got '{result.get('status')}'")
self.metrics["success"] += 1
if webhook_url:
self._send_archive_webhook(webhook_url, task["id"], result)
self._write_audit_log(task["id"], "SUCCESS", payload)
return result
def _send_archive_webhook(self, url: str, task_id: str, result: Dict[str, Any]) -> None:
webhook_payload = {
"event": "task.archived",
"taskId": task_id,
"archiveStatus": result.get("status"),
"timestamp": datetime.now(timezone.utc).isoformat(),
"coldStoreTier": result.get("properties", {}).get("coldStoreTier", 1)
}
try:
httpx.post(url, json=webhook_payload, timeout=10.0)
except Exception as e:
logger.error(f"Webhook delivery failed for {task_id}: {e}")
def _write_audit_log(self, task_id: str, status: str, payload: Dict[str, Any]) -> None:
audit_entry = {
"timestamp": datetime.now(timezone.utc).isoformat(),
"taskId": task_id,
"operation": "archive",
"status": status,
"payloadHash": hash(str(payload))
}
logger.info(f"AUDIT: {json.dumps(audit_entry, separators=(',', ':'))}")
Step 5: Processing Results & Efficiency Tracking
Aggregate archival metrics, calculate success rates, and expose the archiver for automated management. The tracking module computes latency averages and cold-store success percentages for governance reporting.
def get_archival_metrics(archiver: CXoneTaskArchiver) -> Dict[str, float]:
total = archiver.metrics["total"]
if total == 0:
return {"success_rate": 0.0, "avg_latency_ms": 0.0}
success_rate = (archiver.metrics["success"] / total) * 100
avg_latency = archiver.metrics["total_latency_ms"] / total
return {"success_rate": success_rate, "avg_latency_ms": avg_latency}
Complete Working Example
The following script initializes the authentication manager, fetches completed tasks, validates constraints, executes atomic archival operations, and reports efficiency metrics. Replace environment variables with your CXone credentials.
import os
import logging
from dotenv import load_dotenv
load_dotenv()
logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
def run_archival_pipeline():
client_id = os.getenv("CXONE_CLIENT_ID")
client_secret = os.getenv("CXONE_CLIENT_SECRET")
tenant_id = os.getenv("CXONE_TENANT_ID")
region = os.getenv("CXONE_REGION", "us-1")
webhook_url = os.getenv("ARCHIVE_WEBHOOK_URL")
auth = CXoneAuthManager(client_id, client_secret, tenant_id, region)
fetcher = CXoneTaskFetcher(auth, f"https://api-{region}.cxone.com")
constraints = ArchiveConstraints(max_retention_days=400, max_archive_tier=3, min_compression_ratio=0.65)
archiver = CXoneTaskArchiver(auth, f"https://api-{region}.cxone.com", constraints)
tasks_response = fetcher.fetch_completed_tasks(page=1, page_size=50)
tasks = tasks_response.get("entities", [])
for task in tasks:
try:
result = archiver.archive_task(task, webhook_url)
logger.info(f"Successfully archived task {task['id']}. Response: {result}")
except Exception as e:
archiver.metrics["failed"] += 1
logger.error(f"Failed to archive task {task['id']}: {e}")
metrics = get_archival_metrics(archiver)
logger.info(f"Archival pipeline complete. Metrics: {metrics}")
if __name__ == "__main__":
run_archival_pipeline()
Common Errors & Debugging
Error: 401 Unauthorized
Cause: Expired access token or invalid client credentials.
Fix: Verify CXONE_CLIENT_ID, CXONE_CLIENT_SECRET, and CXONE_TENANT_ID match your CXone organization. Ensure the CXoneAuthManager refreshes tokens before expiration. The _expires_at buffer subtracts 60 seconds to prevent boundary failures.
Error: 403 Forbidden
Cause: Missing task:read or task:write OAuth scopes on the registered client application.
Fix: Navigate to the CXone Developer Console, edit your OAuth client, and add both scopes. Revoke existing tokens and trigger a fresh credential exchange.
Error: 409 Conflict
Cause: The task is currently locked by another workflow or manual agent action.
Fix: The verify_lock_conflict function checks task.get("lock"). Implement a queue-based retry mechanism or wait for the lock to expire before reissuing the PATCH request.
Error: 429 Too Many Requests
Cause: CXone rate limits enforced per tenant or per endpoint.
Fix: The _retry_patch method implements exponential backoff using the Retry-After header. Do not bypass this logic. Adjust page_size in fetch_completed_tasks to reduce concurrent load if cascading 429s occur across microservices.
Error: 5xx Internal Server Error
Cause: CXone backend transient failure or payload schema mismatch.
Fix: Validate the coldStoreDirective structure against CXone’s accepted custom properties. Retry with a longer timeout or schedule the task for a deferred archival batch. Log the full request/response payload for support case creation.