This sample shows how to run Temporal in an environment that gevent has patched.
Gevent is built to patch Python libraries to attempt to seamlessly convert threaded code into coroutine-based code.
However, it is well known within the gevent community that it does not work well with asyncio, which is the modern
Python approach to coroutines. Temporal leverages asyncio which means by default it is incompatible with gevent. Users
are encouraged to abandon gevent in favor of more modern approaches where they can but it is not always possible.
This sample shows how to use a customized gevent executor to run asyncio Temporal clients, workers, activities, and
workflows.
For this sample, the optional gevent dependency group must be included. To include, run:
poetry install --with gevent
To run the sample, first see README.md for prerequisites such as having a localhost Temporal server running. Then, run the following from this directory to start the worker:
poetry run python worker.py
This will start the worker. The worker has a workflow and two activities, one asyncio based and one gevent based. Now
in another terminal, run the following from this directory to execute the workflow:
poetry run python starter.py
The workflow should run and complete with the hello result. Note on the worker terminal there will be logs of the workflow and activity executions.