Lab: one lifecycle for HTTP, a scheduler and a worker¶

one_lifecycle.py is one AppSpec with three entrypoints (a FastAPI server, an APScheduler job every half second, a daemon loop) sharing one pool; ROLE picks which of them the process runs. Each entrypoint is wrapped in a tracer that prints the four calls the Host makes on it. run_roles.py starts the service as all, api and worker, drives it briefly, sends SIGTERM and prints the timeline.

uv venv --python 3.13 .venv
uv pip install --prerelease=allow --python .venv/bin/python "servicewright[fastapi,apscheduler4]==0.10.0" "httpx==0.28.1"
.venv/bin/python run_roles.py

--prerelease=allow is for APScheduler 4, which is still a pre-release; pin httpx, or the same flag pulls in a 1.0 development build.