8000 Refactor py-config and the general initialization logic of the page (… · pyscript/pyscript@c75f885 · GitHub
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antocuniantocuni
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Refactor py-config and the general initialization logic of the page (#806)
This PR is the first step to improve and rationalize the life-cycle of a pyscript app along the lines of what I described in #763 . It is not a complete solution, more PRs will follow. Highlights: - py-config is no longer a web component: the old code relied on PyConfig.connectedCallback to do some logic, but then if no <py-config> tag was present, we had to introduce a dummy one with the sole goal of activating the callback. Now the logic is much more linear. - the new pyconfig.ts only contains the code which is needed to parse the config; I also moved some relevant code from utils.ts because it didn't really belong to it - the old PyConfig class did much more than dealing with the config: in particular, it contained the code to initialize the env and the runtime. Now this logic has been moved directly into main.ts, inside the new PyScriptApp class. I plan to refactor the initialization code in further PRs - the current code relies too much on global state and global variables, they are everywhere. This PR is a first step to solve the problem by introducing a PyScriptApp class, which will hold all the mutable state of the page. Currently only config is stored there, but eventually I will migrate more state to it, until we will have only one global singleton, globalApp - thanks to what I described above, I could kill the appConfig svelte store: one less store to kill :).
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‎.pre-commit-config.yaml‎

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- --py310-plus
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- repo: https://github.com/pre-commit/mirrors-eslint
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rev: v8.24.0
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rev: v8.23.1
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hooks:
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- id: eslint
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files: pyscriptjs/src/.*\.[jt]sx?$ # *.js, *.jsx, *.ts and *.tsx

‎pyscriptjs/src/components/pyconfig.ts‎

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This file was deleted.

‎pyscriptjs/src/main.ts‎

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import './styles/pyscript_base.css';
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import { loadConfigFromElement } from './pyconfig';
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import type { AppConfig } from './pyconfig';
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import type { Runtime } from './runtime';
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import { PyScript } from './components/pyscript';
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import { PyEnv } from './components/pyenv';
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import { PyLoader } from './components/pyloader';
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import { PyConfig } from './components/pyconfig';
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import { PyodideRuntime } from './pyodide';
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import { getLogger } from './logger';
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import { globalLoader } from './stores';
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import { globalLoader, runtimeLoaded, addInitializer } from './stores';
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import { handleFetchError, globalExport } from './utils'
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const logger = getLogger('pyscript/main');
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/* eslint-disable @typescript-eslint/no-unused-vars */
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const xPyScript = customElements.define('py-script', PyScript);
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const xPyLoader = customElements.define('py-loader', PyLoader);
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const xPyConfig = customElements.define('py-config', PyConfig);
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const xPyEnv = customElements.define('py-env', PyEnv);
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/* eslint-disable @typescript-eslint/no-unused-vars */
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// As first thing, loop for application configs
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logger.info('checking for py-config');
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const config: PyConfig = document.querySelector('py-config');
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if (!config) {
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const loader = document.createElement('py-config');
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document.body.append(loader);
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// XXX this should be killed eventually
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let runtimeSpec: Runtime;
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runtimeLoaded.subscribe(value => {
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runtimeSpec = value;
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});
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class PyScriptApp {
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config: AppConfig;
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main() {
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this.loadConfig();
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this.initialize();
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/* eslint-disable @typescript-eslint/no-unused-vars */
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const xPyScript = customElements.define('py-script', PyScript);
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const xPyLoader = customElements.define('py-loader', PyLoader);
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const xPyEnv = customElements.define('py-env', PyEnv);
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/* eslint-disable @typescript-eslint/no-unused-vars */
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// add loader to the page body
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logger.info('add py-loader');
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const loader = <PyLoader>document.createElement('py-loader');
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document.body.append(loader);
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globalLoader.set(loader);
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}
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loadConfig() {
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// find the <py-config> tag. If not found, we get null which means
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// "use the default config"
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// XXX: we should actively complain if there are multiple <py-config>
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// and show a big error. PRs welcome :)
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logger.info('searching for <py-config>');
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const el = document.querySelector('py-config');
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this.config = loadConfigFromElement(el);
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logger.info('config loaded:\n' + JSON.stringify(this.config, null, 2));
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}
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initialize() {
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addInitializer(this.loadPackages);
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addInitializer(this.loadPaths);
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this.loadRuntimes();
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}
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loadPackages = async () => {
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logger.info("Packages to install: ", this.config.packages);
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await runtimeSpec.installPackage(this.config.packages);
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}
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loadPaths = async () => {
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const paths = this.config.paths;
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logger.info("Paths to load: ", paths)
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for (const singleFile of paths) {
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logger.info(` loading path: ${singleFile}`);
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try {
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await runtimeSpec.loadFromFile(singleFile);
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} catch (e) {
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//Should we still export full error contents to console?
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handleFetchError(<Error>e, singleFile);
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}
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}
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logger.info("All paths loaded");
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}
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loadRuntimes() {
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logger.info('Initializing runtimes');
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for (const runtime of this.config.runtimes) {
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const runtimeObj: Runtime = new PyodideRuntime(this.config, runtime.src,
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runtime.name, runtime.lang);
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const script = document.createElement('script'); // create a script DOM node
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script.src = runtimeObj.src; // set its src to the provided URL
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script.addEventListener('load', () => {
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void runtimeObj.initialize();
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});
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document.head.appendChild(script);
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}
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}
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}
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function pyscript_get_config() {
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return globalApp.config;
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}
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globalExport('pyscript_get_config', pyscript_get_config);
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// add loader to the page body
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logger.info('add py-loader');
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const loader = <PyLoader>document.createElement('py-loader');
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document.body.append(loader);
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globalLoader.set(loader);
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// main entry point of execution
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const globalApp = new PyScriptApp();
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globalApp.main();

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