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86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
# Copyright (c) Microsoft. All rights reserved.
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import asyncio
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from typing import cast
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from agent_framework import (
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Executor,
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WorkflowBuilder,
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WorkflowContext,
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handler,
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)
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from typing_extensions import Never
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"""
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Sample: Sequential workflow with streaming.
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Two custom executors run in sequence. The first converts text to uppercase,
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the second reverses the text and completes the workflow. The streaming run loop prints events as they occur.
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Purpose:
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Show how to define explicit Executor classes with @handler methods, wire them in order with
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WorkflowBuilder, and consume streaming events. Demonstrate typed WorkflowContext[T_Out, T_W_Out] for outputs,
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ctx.send_message to pass intermediate values, and ctx.yield_output to provide workflow outputs.
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Prerequisites:
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- No external services required.
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"""
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class UpperCaseExecutor(Executor):
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"""Converts an input string to uppercase and forwards it.
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Concepts:
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- @handler methods define invokable steps.
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- WorkflowContext[str] indicates this step emits a string to the next node.
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"""
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@handler
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async def to_upper_case(self, text: str, ctx: WorkflowContext[str]) -> None:
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"""Transform the input to uppercase and send it downstream."""
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result = text.upper()
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# Pass the intermediate result to the next executor in the chain.
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await ctx.send_message(result)
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class ReverseTextExecutor(Executor):
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"""Reverses the incoming string and yields workflow output.
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Concepts:
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- Use ctx.yield_output to provide workflow outputs when the terminal result is ready.
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- The terminal node does not forward messages further.
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"""
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@handler
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async def reverse_text(self, text: str, ctx: WorkflowContext[Never, str]) -> None:
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"""Reverse the input string and yield the workflow output."""
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result = text[::-1]
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await ctx.yield_output(result)
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async def main() -> None:
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"""Build a two step sequential workflow and run it with streaming to observe events."""
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# Step 1: Build the workflow graph.
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# Order matters. We connect upper_case_executor -> reverse_text_executor and set the start.
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upper_case_executor = UpperCaseExecutor(id="upper_case_executor")
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reverse_text_executor = ReverseTextExecutor(id="reverse_text_executor")
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workflow = (
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WorkflowBuilder(start_executor=upper_case_executor).add_edge(upper_case_executor, reverse_text_executor).build()
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)
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# Step 2: Stream events for a single input.
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# The stream will include executor invoke and completion events, plus workflow outputs.
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outputs: list[str] = []
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async for event in workflow.run("hello world", stream=True):
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print(f"Event: {event}")
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if event.type == "output":
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outputs.append(cast(str, event.data))
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if outputs:
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print(f"Workflow outputs: {outputs}")
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if __name__ == "__main__":
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asyncio.run(main())
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