clarifai-protocol 0.0.38

Clarifai Python Runner Protocol

Clarifai Protocol

This is a proprietary protocol used by our runners to communicate with our API. This should be installed as part of our python SDK.

Request Cancellation Support

The protocol now supports request cancellation, allowing models to abort in-flight requests to external inference servers when a user cancels their request.

Features

• Request ID Access: Models can access the current request ID via get_request_id()
• Abort Callbacks: Models can register a callback that will be invoked when requests are cancelled or when connections are aborted
• Thread Safety: All operations are thread-safe and work correctly with concurrent requests
• Background Execution: Abort callbacks run in background threads to avoid blocking the protocol

Usage

from clarifai_protocol import get_request_id, register_abort_callback
import requests

class MyModel:
    def __init__(self):
        super().__init__()
        self.sglang_url = "http://localhost:30000"
        # Register abort callback during initialization
        register_abort_callback(self._abort_sglang)
    
    def _abort_sglang(self, req_id: str) -> None:
        """Abort handler called when requests are cancelled."""
        try:
            requests.post(
                f"{self.sglang_url}/abort_request",
                json={"rid": req_id},
                timeout=2.0
            )
        except Exception:
            pass  # Handle exceptions gracefully
    
    def generate(self, prompt: str):
        """Generate text using external inference server."""
        # Get the request ID to pass to the external server
        req_id = get_request_id()
        
        # Use req_id when calling external services
        for token in self._call_sglang(prompt, req_id):
            yield token

API Reference

get_request_id() -> Optional[str]

Returns the current request ID, or None if called outside of a request context.

Use this as an identifier when calling external inference servers so that cancellation can properly abort the request.

register_abort_callback(callback: Callable[[str], None]) -> None

Register a function to be called when a request is cancelled or the connection is aborted.

• Should be called once during model initialization
• The callback receives the cancelled request's ID as a parameter
• The callback runs in a background thread
• The callback should be idempotent (safe to call multiple times with the same req_id)
• Exceptions in the callback are logged but don't crash the protocol
• Triggered when: explicit cancellation (RUNNER_ITEM_CANCELLED) or connection abort (stream done/cancelled)

Release instructions

Bump the version in the file VERSION, merge it, pull master, git tag to the same version, push the tag to github to release.