swaf/src/components/FrontendToolsComponent.ts

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import {Express, Router} from "express";
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import path from "path";
import config from "config";
import ApplicationComponent from "../ApplicationComponent";
import {logger} from "../Logger";
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import "svelte/register";
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import ViewEngine from "../frontend/ViewEngine";
import {readdirRecursively} from "../Utils";
import FileCache from "../utils/FileCache";
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export default class FrontendToolsComponent extends ApplicationComponent {
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private readonly publicAssetsCache: FileCache = new FileCache();
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public constructor(
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private readonly viewEngine: ViewEngine,
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) {
super();
}
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public async start(app: Express): Promise<void> {
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// Cache public assets
if (config.get<boolean>('asset_cache')) {
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logger.info('Caching assets from', this.viewEngine.getPublicDir(), '...');
await readdirRecursively(
this.viewEngine.getPublicDir(),
async file => await this.publicAssetsCache.load(file),
);
} else {
logger.info('Asset cache disabled.');
}
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// Setup express view engine
app.engine(this.viewEngine.getExtension(), (path, options, callback) => {
this.viewEngine.render(path, options as Record<string, unknown>, callback)
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.catch(err => callback(err));
});
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app.set('views', this.viewEngine.getViewPaths());
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app.set('view engine', 'svelte');
}
public async stop(): Promise<void> {
await this.viewEngine.stop();
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}
public async handle(router: Router): Promise<void> {
router.use((req, res, next) => {
res.locals.inlineAsset = (urlPath: string) => {
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return this.publicAssetsCache.getOrFail(path.join(this.viewEngine.getPublicDir(), urlPath));
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};
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next();
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});
}
public async preCompileViews(watch: boolean): Promise<void> {
await this.viewEngine.preCompileAll(watch);
}
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}