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Russell Bryant
e489ad7a21
- **Add SPDX license headers to python source files** - **Check for SPDX headers using pre-commit** commit 9d7ef44c3cfb72ca4c32e1c677d99259d10d4745 Author: Russell Bryant <rbryant@redhat.com> Date: Fri Jan 31 14:18:24 2025 -0500 Add SPDX license headers to python source files This commit adds SPDX license headers to python source files as recommended to the project by the Linux Foundation. These headers provide a concise way that is both human and machine readable for communicating license information for each source file. It helps avoid any ambiguity about the license of the code and can also be easily used by tools to help manage license compliance. The Linux Foundation runs license scans against the codebase to help ensure we are in compliance with the licenses of the code we use, including dependencies. Having these headers in place helps that tool do its job. More information can be found on the SPDX site: - https://spdx.dev/learn/handling-license-info/ Signed-off-by: Russell Bryant <rbryant@redhat.com> commit 5a1cf1cb3b80759131c73f6a9dddebccac039dea Author: Russell Bryant <rbryant@redhat.com> Date: Fri Jan 31 14:36:32 2025 -0500 Check for SPDX headers using pre-commit Signed-off-by: Russell Bryant <rbryant@redhat.com> --------- Signed-off-by: Russell Bryant <rbryant@redhat.com>
60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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import asyncio
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import functools
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from fastapi import Request
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async def listen_for_disconnect(request: Request) -> None:
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"""Returns if a disconnect message is received"""
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while True:
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message = await request.receive()
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if message["type"] == "http.disconnect":
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break
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def with_cancellation(handler_func):
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"""Decorator that allows a route handler to be cancelled by client
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disconnections.
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This does _not_ use request.is_disconnected, which does not work with
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middleware. Instead this follows the pattern from
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starlette.StreamingResponse, which simultaneously awaits on two tasks- one
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to wait for an http disconnect message, and the other to do the work that we
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want done. When the first task finishes, the other is cancelled.
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A core assumption of this method is that the body of the request has already
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been read. This is a safe assumption to make for fastapi handlers that have
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already parsed the body of the request into a pydantic model for us.
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This decorator is unsafe to use elsewhere, as it will consume and throw away
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all incoming messages for the request while it looks for a disconnect
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message.
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In the case where a `StreamingResponse` is returned by the handler, this
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wrapper will stop listening for disconnects and instead the response object
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will start listening for disconnects.
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"""
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# Functools.wraps is required for this wrapper to appear to fastapi as a
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# normal route handler, with the correct request type hinting.
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@functools.wraps(handler_func)
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async def wrapper(*args, **kwargs):
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# The request is either the second positional arg or `raw_request`
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request = args[1] if len(args) > 1 else kwargs["raw_request"]
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handler_task = asyncio.create_task(handler_func(*args, **kwargs))
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cancellation_task = asyncio.create_task(listen_for_disconnect(request))
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done, pending = await asyncio.wait([handler_task, cancellation_task],
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return_when=asyncio.FIRST_COMPLETED)
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for task in pending:
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task.cancel()
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if handler_task in done:
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return handler_task.result()
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return None
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return wrapper
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