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Merge pull request #59 from pyscript/pe-cdn-mode
Bring in a "CDN mode"
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‎.github/workflows/tests.yml‎

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matrix:
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include:
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- { python: "3.10", os: "ubuntu-latest", session: "pre-commit" }
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- { python: "3.10", os: "ubuntu-latest", session: "safety" }
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- { python: "3.10", os: "ubuntu-latest", session: "mypy" }
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- { python: "3.10", os: "ubuntu-latest", session: "tests" }
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- { python: "3.10", os: "windows-latest", session: "tests" }

‎TODO.md‎

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## Now
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- CDN mode
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## Soon
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- Start documentation for example writers
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- Explain that we own the `src` in `py-config`
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- Remove the hack in noxfile to have tests only run the "fast" ones
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- Playright files get the example index.html directly
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- And thus, don't have the py-config src re-pointed to cdn
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- When run in nox, there are no local files and need to do CDN
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## Eventually
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- Get nox to work with downloaded pyodide/pyscript
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- Get numpy, pandas, etc. downloaded into local dir
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- Get rid of Poetry
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## Done

‎docs/developers/cdn_mode.md‎

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# CDN Mode
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Add a way to get PyScript/Pyodide locally sometimes, but from CDN other times.
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## Why
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When running and testing locally, the developers (and example writers) want fast turnaround.
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They don't want to keep going out on a possibly-slow network -- or even no-network, if offline.
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In "production", though, we want people browsing the examples to get the CDN version.
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Other times are harder to decide.
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GitHub Actions would like a nice speedup.
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But it will take some investigation to learn how to cache artifacts.
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## When
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There are several contexts where this decision needs to be made.
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## Standalone Example
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The Gallery examples are designed to allow people to preview an example's `index.html` without the app.
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They have a `<script>` in `<head>` pointed at `pyscript.js`.
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They also have a `<py-config>` in the body to point at a Pyodide runtime.
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We encourage them to point at the locally-downloaded assets.
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The build step then removes those nodes from the generated output, inserting the Gallery's decision on both.
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### Local Web App
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Some people will pip install the PSC and go through them locally.
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Perhaps even hack on them.
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Or, contributors writing an example will want a preview.
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Both will fire up Starlette locally.
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### Local Playwright
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When running an "end-to-end" (E2E) test, you want fast turnaround.
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You don't want to go out on the network, repeatedly.
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### Local/GHA Nox
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Nox is used to run our "machinery" in isolation.
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We run it locally, as a last step before pushing.
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We might also run it locally just for automation, e.g. the reloading Sphinx server.
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But it also runs when GitHub Actions workflows call it.
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In theory, you want local Nox to be exactly the same as GHA Nox.
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Otherwise, you aren't recreating the build environment.
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### Production Static Website
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The GHA generates a static website.
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This should be pointed at the CDN
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## Where
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The moral of the story: we should point at the CDN *unless* something says to point at local.
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There are several places we make point at assets.
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### `pyscript.js`
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Two locations.
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First, in an example's `index.html`, when it is viewed "standalone".
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Second, in the `example.jinja2` template's `<head>`.
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### `gallery/examples/pyconfig.toml`
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This is also pointed to in two locations.
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Again, from an example's `index.html`.
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Here you'll have a `<py-config src="../pyconfig.toml">` node which might include some instructions in the content.
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## Solution
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During local (non-CDN) use, we'll change the `<py-config>` to use `src="pyconfig.local.toml`.
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How?
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We're already using BeautifulSoup to pick apart the `index.html`.
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Once we make the local vs. CDN decision, we can easily change the `src` attribute to point either TOML file.
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What is the local vs. CDN criteria?
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We'll just look for the `src/pyscript` and `src/pyodide` directory.
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If they exist, then someone downloaded the assets.
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That's a good flag for whether to point at those directories.
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What is the action to take?
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The `py_config.local.toml` file has a `runtimes.src` entry pointing to the local `pyodide.js`.
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The `py_config.cdn.toml` file points at the CDN version.
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## Actions
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- Remove the timeout
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- Test/implementation that calls a `is_local` function to detect the correct mode
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- Test/implementation which wires that into the HTML munger

‎docs/developers/index.md‎

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# Developers
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Articles and notes for the implementers of the app itself.
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```{toctree}
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---
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hidden:
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maxdepth: 1
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---
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cdn_mode
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```

‎docs/index.md‎

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contributing
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building/index
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developers/index
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Code of Conduct <codeofconduct>
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License <license>
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Changelog <https://github.com/pyscript/pyscript-collective/releases>

‎noxfile.py‎

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@@ -28,7 +28,6 @@
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nox.needs_version = ">= 2021.6.6"
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nox.options.sessions = (
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"pre-commit",
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"safety",
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"mypy",
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"tests",
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# "typeguard",
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activate_virtualenv_in_precommit_hooks(session)
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@session(python=python_versions[0])
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def safety(session: Session) -> None:
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"""Scan dependencies for insecure packages."""
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requirements = session.poetry.export_requirements()
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session.install("safety")
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session.run("safety", "check", "--full-report", f"--file={requirements}")
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@session(python=python_versions)
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def mypy(session: Session) -> None:
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"""Type-check using mypy."""
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args = session.posargs or ["src", "tests", "docs/conf.py"]
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args = session.posargs or ["--exclude=examples", "src", "tests", "docs/conf.py"]
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session.install(".")
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session.install(
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"mypy",
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"python-frontmatter",
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)
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try:
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session.run("coverage", "run", "--parallel", "-m", "pytest", *session.posargs)
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session.run(
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"coverage",
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"run",
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"--parallel",
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"-m",
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"pytest",
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"-m",
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"not full",
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*session.posargs,
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)
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finally:
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if session.interactive:
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session.notify("coverage", posargs=[])

‎poetry.lock‎

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‎pyproject.toml‎

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@@ -11,6 +11,10 @@ documentation = "https://psc.readthedocs.io"
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classifiers = [
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"Development Status :: 1 - Planning",
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]
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exclude = [
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"src/psc/pyodide/",
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"src/psc/pyscript/",
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]
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[tool.poetry.urls]
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Changelog = "https://github.com/pauleveritt/psc/releases"
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pre-commit-hooks = ">=4.1.0"
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pytest = ">=6.2.5"
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pyupgrade = ">=2.29.1"
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safety = ">=1.10.3"
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sphinx = ">=4.3.2"
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sphinx-autobuild = ">=2021.3.14"
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sphinx-click = ">=3.0.2"

‎src/psc/app.py‎

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Route("/pages/{page_name}.html", content_page),
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Mount("/gallery", StaticFiles(directory=HERE / "gallery")),
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Mount("/static", StaticFiles(directory=HERE / "static")),
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]
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if PYODIDE.exists():
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Mount("/pyscript", StaticFiles(directory=PYSCRIPT)),
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Mount("/pyodide", StaticFiles(directory=PYODIDE)),
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]
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@contextlib.asynccontextmanager # type: ignore

‎src/psc/fixtures.py‎

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# fake server and run through the interceptor instead.
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page.route("**", _route_handler)
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# Don't spend 30 seconds on timeout
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page.set_default_timeout(12000)
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return page
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values: dict[str, str] = field(default_factory=dict)
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log: list[str] = field(default_factory=list)
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nodes: dict[str, FakeElement] = field(default_factory=dict)
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@pytest.fixture
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@dataclass
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class ElementNode:
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"""An element node."""
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class FakeElementNode:
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"""Fake for PyScript's ``element`` accessor that gets DOM node."""
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log: list[str] = field(default_factory=list)
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def removeAttribute(self, name: str) -> None: # noqa
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"""Pretend to remove an attribute from this node."""
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self.log.append(f"Removed {name}")
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@dataclass
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class FakeElement:
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"""A fake for PyScript's Element global."""
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value: str
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document: FakeDocument
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element: FakeElementNode = FakeElementNode()
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def write(self, value: str) -> None:
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"""Collect anything that is written to the node."""
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self.document.log.append(value)
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def removeAttribute(self, name: str) -> None: # noqa
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"""Pretend to remove an attribute from this node."""
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pass
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@dataclass
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class ElementCallable:
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"""A callable that returns an ElementNode."""
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"""A callable that registers and returns an ElementNode."""
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document: FakeDocument
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def __call__(self, key: str) -> ElementNode:
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def __call__(self, key: str) -> FakeElement:
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"""Return an ElementNode."""
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value = self.document.values[key]
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node = ElementNode(value, self.document)
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node = FakeElement(value, self.document)
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self.document.nodes[key] = node
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return node
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def removeAttribute(self, attr: str) -> None: # noqa: N802
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"""Fake the remove attribute call."""
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pass
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def write(self, content: str) -> None:
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"""Fake the write call."""
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pass
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@pytest.fixture
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def fake_element(fake_document: FakeDocument) -> None: # type: ignore [misc]
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def fake_element(fake_document: FakeDocument) -> ElementCallable: # type: ignore [misc]
232248
"""Install the stateful Element into builtins."""
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try:
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builtins.Element = ElementCallable(fake_document) #type: ignore [attr-defined]
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yield
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this_element = ElementCallable(fake_document)
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builtins.Element = this_element # type: ignore [attr-defined]
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yield this_element
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finally:
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delattr(builtins, "Element")

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