Add Python worker

Author: charliermarsh

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/ruff-action@v3

.gitignore

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+# Pyodide
+.venv-pyodide
+src/vendor
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[codz]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py.cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# UV
+#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#uv.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+#poetry.toml
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#   pdm recommends including project-wide configuration in pdm.toml, but excluding .pdm-python.
+#   https://pdm-project.org/en/latest/usage/project/#working-with-version-control
+#pdm.lock
+#pdm.toml
+.pdm-python
+.pdm-build/
+
+# pixi
+#   Similar to Pipfile.lock, it is generally recommended to include pixi.lock in version control.
+#pixi.lock
+#   Pixi creates a virtual environment in the .pixi directory, just like venv module creates one
+#   in the .venv directory. It is recommended not to include this directory in version control.
+.pixi
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.envrc
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+# Abstra
+# Abstra is an AI-powered process automation framework.
+# Ignore directories containing user credentials, local state, and settings.
+# Learn more at https://abstra.io/docs
+.abstra/
+
+# Visual Studio Code
+#  Visual Studio Code specific template is maintained in a separate VisualStudioCode.gitignore 
+#  that can be found at https://github.com/github/gitignore/blob/main/Global/VisualStudioCode.gitignore
+#  and can be added to the global gitignore or merged into this file. However, if you prefer, 
+#  you could uncomment the following to ignore the entire vscode folder
+# .vscode/
+
+# Ruff stuff:
+.ruff_cache/
+
+# PyPI configuration file
+.pypirc
+
+# Cursor
+#  Cursor is an AI-powered code editor. `.cursorignore` specifies files/directories to
+#  exclude from AI features like autocomplete and code analysis. Recommended for sensitive data
+#  refer to https://docs.cursor.com/context/ignore-files
+.cursorignore
+.cursorindexingignore
+
+# Marimo
+marimo/_static/
+marimo/_lsp/
+__marimo__/

.python-version

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+3.12

README.md

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+# uv-cloudflare-workers-example
+
+[![Deploy to Cloudflare](https://deploy.workers.cloudflare.com/button)](https://deploy.workers.cloudflare.com/?url=https://github.com/astral-sh/uv-cloudflare-workers-example)
+
+Deploying a FastAPI application to [Cloudflare Workers](https://developers.cloudflare.com/workers/) with [uv](https://docs.astral.sh/uv/).
+
+## Usage
+
+From the repository root, deploy to Cloudflare with:
+
+```bash
+./build.sh
+npx wrangler deploy
+```
+
+You can then navigate to the [Worker URL](https://uv-cloudflare-workers-example.astral-1ad.workers.dev)
+to see the "Hello from Python!" message, `/hello/{name}` to see a templatized response, and `/version` to see the
+version of `cffi` (an extension module containing native code).

build.sh

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+#!/bin/bash
+set -euxo pipefail
+
+PYODIDE_VERSION=0.27.7
+
+# Clean up previous builds.
+echo "Cleaning up previous builds..."
+rm -rf ./src/vendor
+rm -rf .venv-pyodide
+
+# Install pyodide CLI.
+uv tool install --with pyodide-build --with pip pyodide-cli --python 3.12
+
+# Create the xbuild environment.
+pyodide xbuildenv install $PYODIDE_VERSION
+
+# Create virtual environment.
+pyodide venv .venv-pyodide
+
+# Install requirements.
+echo "Installing dependencies..."
+uv export --python .venv-pyodide --index https://pyodide.astral.sh/$PYODIDE_VERSION | uv pip sync \
+    --no-installer-metadata \
+    --no-compile-bytecode \
+    --only-binary :all: \
+    --target src/vendor \
+    --python .venv-pyodide \
+    --index https://pyodide.astral.sh/$PYODIDE_VERSION \
+    -
+
+echo "Build completed successfully!"

pyproject.toml

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+[project]
+name = "uv-cloudflare-workers-example"
+version = "0.0.1"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "cffi",
+    "fastapi",
+    "jinja2",
+]

src/worker.py

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+from fastapi import FastAPI
+
+
+async def on_fetch(request, env):
+    import asgi
+
+    return await asgi.fetch(app, request, env)
+
+
+app = FastAPI()
+
+
+@app.get("/")
+async def root():
+    return {"message": "Hello from Python!"}
+
+
+@app.get("/hello/{name}")
+async def hello(name: str):
+    import jinja2
+
+    environment = jinja2.Environment()
+    template = environment.from_string("Hello, {{ name }}!")
+    message = template.render(name=name)
+    return {"message": message}
+
+
+@app.get("/version")
+async def version():
+    import cffi
+
+    return {"version": cffi.__version__}