Workflow Cancellation

import threading
import time

from agno.agent import Agent
from agno.models.openai import OpenAIResponses
from agno.run.agent import RunEvent
from agno.run.base import RunStatus
from agno.run.workflow import WorkflowRunEvent
from agno.tools.hackernews import HackerNewsTools
from agno.workflow.step import Step
from agno.workflow.workflow import Workflow


def long_running_task(workflow: Workflow, run_id_container: dict):
    """
    Simulate a long-running workflow task that can be cancelled.

    Args:
        workflow: The workflow to run
        run_id_container: Dictionary to store the run_id for cancellation

    Returns:
        Dictionary with run results and status
    """
    try:
        # Start the workflow run - this simulates a long task
        final_response = None
        content_pieces = []

        for chunk in workflow.run(
            "Write a very long story about a dragon who learns to code. "
            "Make it at least 2000 words with detailed descriptions and dialogue. "
            "Take your time and be very thorough.",
            stream=True,
        ):
            if "run_id" not in run_id_container and chunk.run_id:
                print(f"> Workflow run started: {chunk.run_id}")
                run_id_container["run_id"] = chunk.run_id

            if chunk.event in [RunEvent.run_content]:
                print(chunk.content, end="", flush=True)
                content_pieces.append(chunk.content)
            elif chunk.event == RunEvent.run_cancelled:
                print(f"\n> Workflow run was cancelled: {chunk.run_id}")
                run_id_container["result"] = {
                    "status": "cancelled",
                    "run_id": chunk.run_id,
                    "cancelled": True,
                    "content": "".join(content_pieces)[:200] + "..."
                    if content_pieces
                    else "No content before cancellation",
                }
                return
            elif chunk.event == WorkflowRunEvent.workflow_cancelled:
                print(f"\n> Workflow run was cancelled: {chunk.run_id}")
                run_id_container["result"] = {
                    "status": "cancelled",
                    "run_id": chunk.run_id,
                    "cancelled": True,
                    "content": "".join(content_pieces)[:200] + "..."
                    if content_pieces
                    else "No content before cancellation",
                }
                return
            elif hasattr(chunk, "status") and chunk.status == RunStatus.completed:
                final_response = chunk

        # If we get here, the run completed successfully
        if final_response:
            run_id_container["result"] = {
                "status": final_response.status.value
                if final_response.status
                else "completed",
                "run_id": final_response.run_id,
                "cancelled": final_response.status == RunStatus.cancelled,
                "content": ("".join(content_pieces)[:200] + "...")
                if content_pieces
                else "No content",
            }
        else:
            run_id_container["result"] = {
                "status": "unknown",
                "run_id": run_id_container.get("run_id"),
                "cancelled": False,
                "content": ("".join(content_pieces)[:200] + "...")
                if content_pieces
                else "No content",
            }

    except Exception as e:
        print(f"\n> Exception in run: {str(e)}")
        run_id_container["result"] = {
            "status": "error",
            "error": str(e),
            "run_id": run_id_container.get("run_id"),
            "cancelled": False,
            "content": "Error occurred",
        }


def cancel_after_delay(
    workflow: Workflow, run_id_container: dict, delay_seconds: int = 3
):
    """
    Cancel the workflow run after a specified delay.

    Args:
        workflow: The workflow whose run should be cancelled
        run_id_container: Dictionary containing the run_id to cancel
        delay_seconds: How long to wait before cancelling
    """
    print(f"> Will cancel workflow run in {delay_seconds} seconds...")
    time.sleep(delay_seconds)

    run_id = run_id_container.get("run_id")
    if run_id:
        print(f"> Cancelling workflow run: {run_id}")
        success = workflow.cancel_run(run_id)
        if success:
            print(f"> Workflow run {run_id} marked for cancellation")
        else:
            print(
                f"> Failed to cancel workflow run {run_id} (may not exist or already completed)"
            )
    else:
        print(">  No run_id found to cancel")


def main():
    """Main function demonstrating workflow run cancellation."""

    # Create workflow agents
    researcher = Agent(
        name="Research Agent",
        model=OpenAIResponses(id="gpt-5.2"),
        tools=[HackerNewsTools()],
        instructions="Research the given topic and provide key facts and insights.",
    )

    writer = Agent(
        name="Writing Agent",
        model=OpenAIResponses(id="gpt-5.2"),
        instructions="Write a comprehensive article based on the research provided. Make it engaging and well-structured.",
    )
    research_step = Step(
        name="research",
        agent=researcher,
        description="Research the topic and gather information",
    )

    writing_step = Step(
        name="writing",
        agent=writer,
        description="Write an article based on the research",
    )

    # Create a Steps sequence that chains these above steps together
    article_workflow = Workflow(
        description="Automated article creation from research to writing",
        steps=[research_step, writing_step],
        debug_mode=True,
    )

    print("> Starting workflow run cancellation example...")
    print("=" * 50)

    # Container to share run_id between threads
    run_id_container = {}

    # Start the workflow run in a separate thread
    workflow_thread = threading.Thread(
        target=lambda: long_running_task(article_workflow, run_id_container),
        name="WorkflowRunThread",
    )

    # Start the cancellation thread
    cancel_thread = threading.Thread(
        target=cancel_after_delay,
        args=(article_workflow, run_id_container, 8),  # Cancel after 8 seconds
        name="CancelThread",
    )

    # Start both threads
    print("> Starting workflow run thread...")
    workflow_thread.start()

    print("> Starting cancellation thread...")
    cancel_thread.start()

    # Wait for both threads to complete
    print("> Waiting for threads to complete...")
    workflow_thread.join()
    cancel_thread.join()

    # Print the results
    print("\n" + "=" * 50)
    print("> RESULTS:")
    print("=" * 50)

    result = run_id_container.get("result")
    if result:
        print(f"Status: {result['status']}")
        print(f"Run ID: {result['run_id']}")
        print(f"Was Cancelled: {result['cancelled']}")

        if result.get("error"):
            print(f"Error: {result['error']}")
        elif result["cancelled"]:
            print(f"Content Preview: {result['content']}")
            print("\n> SUCCESS: Workflow run was successfully cancelled!")
        else:
            print(f"Content Preview: {result['content']}")
            print("\n>  WARNING: Workflow run completed before cancellation")
    else:
        print("> No result obtained - check if cancellation happened during streaming")

    print("\n> Workflow cancellation example completed!")


if __name__ == "__main__":
    # Run the main example
    main()