RuntimeError: Broker could not provide patch for D321887 (HTTP 500): Internal Server Error

Two runs with the same issues:

• https://hackbot.moz.tools/runs/a3daf468-6939-40cd-ac14-177e47e2fa8f
• https://hackbot.moz.tools/runs/2defded5-d894-4a5a-883f-a345b511e174

Note: the target revision is part of a stack and stacks are not supported yet.

Broker:

Traceback (most recent call last):
  File "/opt/venv/lib/python3.12/site-packages/uvicorn/protocols/http/h11_impl.py", line 416, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 63, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/starlette/applications.py", line 90, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/opt/venv/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
    raise exc
  File "/opt/venv/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/opt/venv/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 63, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/opt/venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    raise exc
  File "/opt/venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
    await app(scope, receive, sender)
  File "/opt/venv/lib/python3.12/site-packages/starlette/routing.py", line 660, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/opt/venv/lib/python3.12/site-packages/starlette/routing.py", line 680, in app
    await route.handle(scope, receive, send)
  File "/opt/venv/lib/python3.12/site-packages/starlette/routing.py", line 276, in handle
    await self.app(scope, receive, send)
  File "/opt/venv/lib/python3.12/site-packages/starlette/routing.py", line 64, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/opt/venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    raise exc
  File "/opt/venv/lib/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
    await app(scope, receive, sender)
  File "/opt/venv/lib/python3.12/site-packages/starlette/routing.py", line 61, in app
    response = await f(request)
               ^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/hackbot_agents/bug_fix/broker.py", line 79, in get_patch
    base_commit = await client.resolve_commit(diff.base_commit)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/phabricator_client/client.py", line 174, in resolve_commit
    commits = data.values()
              ^^^^^^^^^^^
AttributeError: 'list' object has no attribute 'values'

Agent:

Traceback (most recent call last):
  File "/opt/venv/lib/python3.12/site-packages/hackbot_runtime/runtime.py", line 214, in run_async
    outcome: object = asyncio.run(entrypoint(ctx))
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/base_events.py", line 691, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/hackbot_agents/bug_fix/__main__.py", line 52, in main
    await checkout_revision(ctx, inputs.revision_id, inputs.broker_url)
  File "/opt/venv/lib/python3.12/site-packages/hackbot_runtime/revision.py", line 50, in checkout_revision
    raise RuntimeError(
RuntimeError: Broker could not provide patch for D321887 (HTTP 500): Internal Server Error

Start with hackbot_agents/bug_fix/broker.py:get_patch and trace its call to phabricator_client/client.py:resolve_commit. Reproduce the failure using the two linked run records and inspect how the stack revision is resolved; done means the reported revision request no longer fails with this broker 500.