Táillí License Client for Python

A friendly Python client for the Táillí License Manager. Manage seats and API keys for offline/air-gapped deployments with minimal code.

Installation

pip install tailli-license

Or install from source:

cd license-manager/clients/python
pip install -e .

Quick Start

from tailli_license import LicenseClient

# Connect to your License Manager
client = LicenseClient(
    base_url="http://localhost:8787",
    product_id="my-product"
)

# Use a seat with automatic cleanup
with client.seat() as seat:
    print(f"Allocated seat: {seat.seat_id}")
    # Do your licensed work here
    run_my_application()
# Seat automatically released when done

Features

• Simple context manager - Seats are automatically released, even on exceptions
• Auto-refresh - Tokens are refreshed in the background, no manual work needed
• Zero dependencies - Uses only Python standard library
• Type hints - Full type annotations for IDE support
• Friendly errors - Clear exceptions for common issues (seat limit, expired license)

Usage Examples

Check License Status

from tailli_license import LicenseClient

client = LicenseClient("http://localhost:8787", product_id="video-processor")

status = client.status()
print(f"Product: {status['productId']}")
print(f"Seats: {status['seatsInUse']}/{status['seats']} in use")
print(f"Expires: {status['expiry']}")
print(f"Features: {', '.join(status['features'])}")

Use a Seat (Recommended)

The context manager is the cleanest way to use seats:

from tailli_license import LicenseClient, SeatLimitError, LicenseExpiredError

client = LicenseClient("http://localhost:8787", product_id="video-processor")

try:
    with client.seat() as seat:
        print(f"Got seat {seat.seat_id}")

        # Your licensed code here
        process_videos()

except SeatLimitError:
    print("All seats are in use. Please try again later.")
except LicenseExpiredError:
    print("Your license has expired. Please contact support.")

Add Context for Auditing

Track who's using seats for compliance and debugging:

with client.seat(context={"user": "alice", "workstation": "lab-pc-42"}) as seat:
    run_analysis()

Manual Seat Management

For more control, manage seats directly:

# Allocate a seat
seat = client.allocate(context={"user": "bob"})

try:
    # Do work...
    for batch in data_batches:
        process(batch)
finally:
    # Always release when done
    seat.release()

Disable Auto-Refresh

For short operations, you might not need background refresh:

with client.seat(auto_refresh=False) as seat:
    quick_operation()  # Done in < 1 minute

Check Feature Entitlements

See what features your license enables:

entitlements = client.get_entitlements()

if "ai-enhancement" in entitlements["features"]:
    enable_ai_features()

if "batch-processing" in entitlements["features"]:
    enable_batch_mode()

print(f"API keys: {entitlements['keysIssued']}/{entitlements['maxKeys']} used")

Verify User API Keys

Validate JWTs issued by the License Manager:

try:
    payload = client.verify_key(user_provided_token)
    print(f"Valid token for product: {payload['productId']}")
    print(f"Features: {payload['features']}")
except LicenseError:
    print("Invalid or expired token")

Error Handling

The client provides specific exceptions for common scenarios:

from tailli_license import (
    LicenseClient,
    LicenseError,      # Base class for all errors
    SeatLimitError,    # All seats are in use
    LicenseExpiredError,  # License has expired
    ConnectionError,   # Can't reach License Manager
)

client = LicenseClient("http://localhost:8787", product_id="my-product")

try:
    with client.seat() as seat:
        do_work()
except SeatLimitError:
    # All seats taken - maybe queue the request or notify user
    queue_for_later()
except LicenseExpiredError:
    # License expired - notify admin
    notify_admin("License expired!")
except ConnectionError:
    # Can't reach LM - maybe it's down or network issue
    use_cached_state_or_fail_gracefully()
except LicenseError as e:
    # Other license-related errors
    log_error(f"License error: {e}")

Configuration

Client Options

client = LicenseClient(
    base_url="http://localhost:8787",  # License Manager URL
    product_id="my-product",            # Your product ID
    timeout=30.0,                       # Request timeout in seconds
)

Seat Options

with client.seat(
    context={"user": "alice"},  # Metadata for auditing
    auto_refresh=True,          # Keep token fresh (default: True)
) as seat:
    pass

Logging

Enable debug logging to see what's happening:

import logging

logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger("tailli_license")
logger.setLevel(logging.DEBUG)

Thread Safety

The LicenseClient is thread-safe. You can share one client across threads:

from concurrent.futures import ThreadPoolExecutor

client = LicenseClient("http://localhost:8787", product_id="my-product")

def worker(task_id):
    with client.seat(context={"task": task_id}) as seat:
        process_task(task_id)

with ThreadPoolExecutor(max_workers=4) as executor:
    executor.map(worker, range(10))

Each seat() call gets its own seat allocation.

API Reference

LicenseClient

Seat

License

MIT License - see the main Táillí repository for details.