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[sw] Added a first version of the PyScript Service Worker (#1621)

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* Added a first version of the PyScript Service Worker

* Fix typo as suggested

Co-authored-by: Fabio Pliger <fpliger@users.noreply.github.com>

---------

Co-authored-by: Fabio Pliger <fpliger@users.noreply.github.com>
This commit is contained in:
Andrea Giammarchi
2023-08-08 10:57:26 +02:00
committed by GitHub
parent 77d8fe3562
commit b5a0cd4057
12 changed files with 995 additions and 1 deletions
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# @pyscript/sw
<sup>**[PyScript](https://github.com/pyscript/pyscript) Service Worker**</sup>
---
## Documentation
This module provides a single, standalone, *script* able to bootstrap a Service Worker which can drive a whole site via Python code.
Please note the file *must* be available locally and it *must not* be loaded as a module, as a Service Worker is *not a module*.
### Example
This is the bare minimal example of an `index.html` file at the root of the site.
```html
<!doctype html>
<script src="./pyscript.sw.js"
handler="./handler.py"
config="./handler_config.toml"
scope="."></script>
```
* **src** is where the PyScript Service Worker is located.
* **handler** is where Python code is located. This *must* provide a `handle_request` method that will be invoked per each browsing *fetch* operation. Such method should return a `[body, status, headers]` tuple where *body* is the content of the page, *status* is its *HTTP* status and *headers* contain the `content-type` or any other useful header.
* **config** is an *optional* attribute that indicates packages to load, files to fetch, and all other usual [py-config goodness](https://docs.pyscript.net/latest/reference/elements/py-config.html).
* **scope** (advanced use-case) is an *optional* attribute that indicates [where the Service Worker operates](https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope). By default it operates from the same folder, and any subfolder, the `pyscript.sw.js` is.
#### How to update `handle_request`
Because the Service Worker, once activated, will persist over any further session, it is pretty hard to change its operating handler.
To do so, there are two options:
* unregister the Service Worker, clear all browsing data per that domain and hard-refresh the browser
* change and save your `handler.py` file and, once saved, reach the `/pyscript.sw/update_handler` via browser, or run the following code in console:
```js
fetch('/pyscript.sw/update_handler')
.then(b => b.text())
.then(console.log, console.error);
```
This operation will be intercepted behind the scene and the new file will be parsed.
The result should be an `OK` response, with status `200`, or an error message with status `500` handled by the `console.error` or visible within the page once reached.

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20
pyscript.sw/package.json Normal file
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{
"name": "@pyscript/sw",
"version": "0.0.1",
"description": "PyScript Service Worker",
"main": "pyscript.sw.js",
"scripts": {
"server": "npx static-handler .",
"build": "rollup --config rollup/sw.config.mjs"
},
"keywords": [],
"author": "Anaconda Inc.",
"license": "APACHE-2.0",
"devDependencies": {
"@rollup/plugin-node-resolve": "^15.1.0",
"@rollup/plugin-terser": "^0.4.3",
"basic-toml": "^0.3.1",
"rollup": "^3.27.0",
"static-handler": "^0.4.2"
}
}

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pyscript.sw/pyscript.sw.js Normal file
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!function(){"use strict";(({document:e,navigator:{serviceWorker:t}})=>{if(e){const{href:s}=location,{controller:n}=t,{currentScript:a}=e,{src:r,attributes:{config:i,handler:o,scope:c}}=a;n&&n.postMessage({config:i?.value?new URL(i.value,s).href:"",handler:new URL(o.value,s).href}),t.addEventListener("message",(({data:e})=>{"reload"===e&&location.reload()})),t.register(r,{scope:c?.value||"."}).then((e=>{e.addEventListener("updatefound",(()=>location.reload())),e.active&&!n&&location.reload()}))}else{const e="https://cdn.jsdelivr.net/pyodide/v0.23.4/full";importScripts(`${e}/pyodide.js`);const t=async e=>(await Promise.resolve().then((function(){return r}))).parse(e),s=loadPyodide({indexURL:e});addEventListener("install",(()=>skipWaiting())),addEventListener("activate",(e=>e.waitUntil(clients.claim())));let n,a,i=!1,o=new Promise((e=>{addEventListener("message",(async({data:{config:r,handler:o}})=>{if(r){const e=await s,n=[fetch(r),e.loadPackage("micropip")];n[0]=r.endsWith(".json")?n[0].then((e=>e.json())):n[0].then((e=>e.text())).then(t);const[{packages:a}]=await Promise.all(n),i=await e.pyimport("micropip");await i.install(a)}a=o;const l=await c();i=!0;(await clients.get(n)).postMessage("reload"),e(l)}),{once:!0})}));const c=()=>new Promise((async(e,t)=>{const n=await s,r=await fetch(a).then((e=>e.text())),i=n.globals.get("dict")();await n.runPythonAsync(r,{globals:i}).catch(t),e(i.get("handle_request")),i.destroy()}));addEventListener("fetch",(e=>{if(n||(n=e.clientId),i)if("/pyscript.sw/update_handler"===new URL(e.request.url).pathname){const t=c();e.respondWith(t.then((()=>(o=t,new Response("OK",{headers:{"content-type":"text/plain"},status:200}))),(e=>new Response(e.message,{headers:{"content-type":"text/plain"},status:500}))))}else e.respondWith(o.then((async t=>{const[s,n,a]=await t(e.request);return new Response(s,{headers:a,status:n})})))}))}})(self);
/*! (c) Andrea Giammarchi - ISC */
const{isArray:e}=Array,{parse:t}=JSON,s=(e,{s:t})=>e.replace(/"s(\d+)"/g,((e,s)=>t[s])),n=(e,s)=>t(e.replace(/(\S+?)\s*=/g,'"$1":'),((e,t)=>"string"==typeof t?s[t[0]][t.slice(1)]:t)),a=(t,n,a,r)=>{for(let i=0,{length:o}=t,c=o-1;i<o;i++){const o=s(t[i],n);a=a[o]||(a[o]=r&&i===c?[]:{}),e(a)&&(i!==c&&a.length||a.push({}),a=a.at(-1))}return a};var r=Object.freeze({__proto__:null,parse:e=>{const[t,r]=((e,t,s)=>[e.replace(/(["'])(?:(?=(\\?))\2.)*?\1/g,(e=>`"s${t.push(e.slice(1,-1))-1}"`)).replace(/\d{2,}([:-]\d{2}){2}([ T:-][\dZ:-]+)?/g,(e=>`"d${s.push(new Date(e))-1}"`)).replace(/,\s*[\r\n]+/g,", ").replace(/\[\s*[\r\n]+/g,"[").replace(/[\r\n]+\s*]/g,"]"),{s:t,d:s}])(e,[],[]),i={};let o=i;for(let e of t.split(/[\r\n]+/))if((e=e.trim())&&!e.startsWith("#"))if(/^(\[+)(.*?)\]+/.test(e))o=a(RegExp.$2.trim().split("."),r,i,"["!==RegExp.$1);else if(/^(\S+?)\s*=([^#]+)/.test(e)){const{$1:e,$2:t}=RegExp;o[s(e,r)]=n(t.trim(),r)}return i}})}();

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pyscript.sw/rollup/sw.config.mjs Normal file
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// This file generates /core.js minified version of the module, which is
// the default exported as npm entry.
import { nodeResolve } from "@rollup/plugin-node-resolve";
import terser from "@rollup/plugin-terser";
export default {
input: "./src/sw.js",
plugins: process.env.NO_MIN ? [nodeResolve()] : [nodeResolve(), terser()],
output: {
esModule: false,
inlineDynamicImports: true,
file: "./pyscript.sw.js",
format: "iife",
},
};

154
pyscript.sw/src/sw.js Normal file
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// NOTE: this file must be a single JS file so that we can distribute it
// as standalone "one-shop" entry for the Service Worker, i.e.:
// <script src="../pyscript.sw.js" handler="./file.py"></script>
// prevent global scope pollution with local references
// this callback works in both the main page and in the SW
(({ document, navigator: { serviceWorker } }) => {
// here we are on the main page
if (document) {
const { href } = location;
const { controller } = serviceWorker;
const { currentScript } = document;
const {
src,
attributes: { config, handler, scope },
} = currentScript;
// send files to fetch and handle to the Service Worker
// after resolving the path through current page location
// (not the service worker one as these likely have different relative folders)
if (controller) {
controller.postMessage({
config: config?.value ? new URL(config.value, href).href : "",
// handler is mandatory (or it means there's nothing to run as Python)
handler: new URL(handler.value, href).href,
});
}
// do reload automatically once everything has been bootstrapped
serviceWorker.addEventListener("message", ({ data }) => {
if (data === "reload") location.reload();
});
// register the Service Worker with an optional scope ...
serviceWorker
.register(src, { scope: scope?.value || "." })
.then((registration) => {
// ... once registered, let the SW automatically handle the page reload
registration.addEventListener("updatefound", () =>
location.reload(),
);
if (registration.active && !controller) location.reload();
});
}
// here we are on the Service Worker
else {
const indexURL = "https://cdn.jsdelivr.net/pyodide/v0.23.4/full";
// because of this issue https://github.com/w3c/ServiceWorker/issues/1356
// the pyodide must be loaded sync ASAP or `importScripts` will fail
importScripts(`${indexURL}/pyodide.js`);
// ⚠️ WARNING: this will be inlined by rollup - can't be used AS IS
const parse = async (text) => (await import('basic-toml')).parse(text);
// this is still not blocking so no problems should happen ... we can bring anything
// directly from the CDN at this point, as pyodide is flagged as secure script here
const interpreter = loadPyodide({ indexURL });
// skip waiting on installation and ensure activation
// this will trigger the automatic reload on the main page
// once the Service Worker is ready to operate
addEventListener("install", () => skipWaiting());
addEventListener("activate", (e) => e.waitUntil(clients.claim()));
let // used to postMessage a reload when everything is ready
clientId,
// keeps the handler path known for future updates
handlerPath,
// let fetch operations through until there is a handler
handleReady = false,
// wait for the postMessage to communicate where is the python file
// and where is the config, if any
handleRequest = new Promise(resolve => {
addEventListener(
"message",
async ({ data: { config, handler } }) => {
if (config) {
const pyodide = await interpreter;
const deps = [
fetch(config),
pyodide.loadPackage("micropip"),
];
// assign the right body retriever accordingly
// with the config extension
deps[0] = config.endsWith(".json") ?
deps[0].then((b) => b.json()) :
deps[0].then((b) => b.text()).then(parse);
const [{ packages }] = await Promise.all(deps);
const micropip = await pyodide.pyimport("micropip");
await micropip.install(packages);
}
handlerPath = handler;
const result = await getHandler();
handleReady = true;
const client = await clients.get(clientId);
client.postMessage("reload");
resolve(result);
},
{ once: true },
);
});
// used to update the handler when '/pyscript.sw/update_handler'
// path is reached and the service worker is already initialized
const getHandler = () => new Promise(async (resolve, reject) => {
const pyodide = await interpreter;
const code = await fetch(handlerPath).then(b => b.text());
const globals = pyodide.globals.get("dict")();
await pyodide.runPythonAsync(code, { globals }).catch(reject);
resolve(globals.get("handle_request"));
globals.destroy();
});
addEventListener("fetch", (event) => {
if (!clientId) clientId = event.clientId;
if (!handleReady) return;
// this switch is to allow possible future operations too
switch (new URL(event.request.url).pathname) {
// reserved: this is our namespace to operate internally
case '/pyscript.sw/update_handler':
const newHandler = getHandler();
event.respondWith(newHandler.then(
() => {
// only if successful the handleRequest is re-assigned
handleRequest = newHandler;
return new Response('OK', {
headers: {'content-type': 'text/plain'},
status: 200
});
},
error => new Response(error.message, {
headers: {'content-type': 'text/plain'},
status: 500
})
));
break;
default:
event.respondWith(
handleRequest.then(async (handler) => {
const [text, status, headers] = await handler(
event.request,
);
return new Response(text, { headers, status });
}),
);
break;
}
});
}
})(self);

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pyscript.sw/test/index.html Normal file
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style>body { font-family: sans-serif; }</style>
<script src="../pyscript.sw.js" handler="./test.py" config="./test.toml"></script>
<script type="module">
// this is just to show some progress
const span = document.querySelector('span');
let i = 0;
(function dot() {
span.textContent = '.'.repeat(++i % 6);
setTimeout(dot, 300);
}());
</script>
</head>
<body>
Loading PyScript Service Worker <span></span>
</body>
</html>

59
pyscript.sw/test/test.py Normal file
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import random
from fastapi import FastAPI
from fastapi.responses import HTMLResponse
from httpx import AsyncClient
app = FastAPI()
base = "/test"
def generate_html_response():
html_content = """
<!doctype html>
<html>
<head>
<title>PyScript Service Worker</title>
</head>
<body>
<h1>PyScript from a service worker 🦄</h1>
<h2>FastAPI demo</h2>
<ul>
<li>Test some random <a href="./json">json</a></li>
<li>Test some random <a href="./emoji">emoji</a></li>
</ul>
</body>
</html>
"""
return HTMLResponse(content=html_content, status_code=200)
@app.get(base + "/", response_class=HTMLResponse)
async def root():
return generate_html_response()
# used to test errors forwarded as 500
# shenanigans(1, 2, 3)
@app.get(base + "/json")
async def json():
# used to test that file changes actually happen when
# '/pyscript.sw/update_handler' is reached
# print(base + "/json")
return {"message": random.choice(["Hello World", "Bonjour le monde", "Hola Mundo"])}
@app.get(base + "/emoji")
async def emoji():
return {"emoji": random.choice(["👋", "👋🏻", "👋🏼", "👋🏽", "👋🏾", "👋🏿"])}
async def handle_request(request):
async with AsyncClient(app=app, base_url="http://testserver") as client:
response = await client.get(request.url)
return response.text, response.status_code, response.headers.items()

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pyscript.sw/test/test.toml Normal file
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packages = ["ssl", "httpx", "fastapi"]