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server.js
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server.js
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import {
existsSync,
mkdirSync,
readFileSync,
readdirSync,
statSync,
writeFileSync,
} from "fs";
import http from "http";
import Koa from "koa";
import { dirname, join, resolve } from "path";
import {
applyBundledJSMiddleware,
applyPublicMiddleware,
applyRouteContextMiddleware,
applySSRMiddleware,
applyWebsocketMiddleware,
start,
} from "./src/middleware/applyMiddlewareToApp.js";
import { put, get } from "./src/shared/filesystem.js";
import {
logging,
createRoute,
renderTemplate,
walkFilesSync,
} from "./src/utilities/utils.js";
import { setupWatcher } from "./src/watcher.js";
import bundle from "./src/shared/bundle.js";
/**
* TODO: Major Refactoring
*
* - make DOM/IIFE bundles optional
* - incremental build improvements
* - fingerprint contents pre-compilation?
* - persistent memfs
*
* process.on('SIGINT', () => {
* // write memfs to disk somewhere so we can resume previous builds
* console.log("Caught interrupt signal");
* process.exit();
* })
*
* with static site generation
* - fingerprint each file & only rebuild if needed (non-existent)
* - clean unused/old files no longer needed
*/
const __dirname = dirname(new URL(import.meta.url).pathname);
const generateStaticSite = async (routes, options) => {
const bundlePromises = routes.map(async (route) => {
const propCallback =
options.props?.[route.url] ?? Promise.resolve.bind(Promise);
return {
route,
props: await propCallback({}), // no way to pass in url params with a static site
bundle: await bundle({ route }, options),
};
});
const bundles = await Promise.all(bundlePromises);
return await Promise.all(
bundles.map(async ({ route, props, bundle }) => ({
route,
props,
bundle,
template: await renderTemplate(bundle, props, options),
}))
);
};
const svelteServer = {
setup: {
/* gets filled with config() */
},
/**
* Sets the configuration object for the svelte server.
* Uses default settings if not called
*
* @param {object} setup optional user configuration file
*
* @return {this} returns the configured server... just call .listen()
*/
config(setup = null) {
const inDev = !(setup?.config?.production ?? setup?.production ?? true);
const inProduction = !inDev;
const publicFolder = join(
resolve(),
setup?.config?.public ?? setup?.public ?? "public"
);
const _templateName =
setup?.config?.template ?? setup?.template ?? "index.template.ejs";
const _userTemplate = join(resolve(), _templateName);
const templateFile = existsSync(_userTemplate)
? _userTemplate
: join(resolve(), "node_modules", "svelte-server", "index.template.ejs");
const defaultAliases = {
"@components": "./components",
"@layouts": "./layouts",
"@pages": "./pages",
};
const mapAliases = (aliases) => {
return Object.fromEntries(
Object.entries(aliases).map(([alias, path]) => {
if (existsSync(join(resolve(), path))) {
return [alias, join(resolve(), path)];
}
})
);
};
Object.assign(this.setup, {
// User supplied props functions
props: setup?.props ?? null,
// hot module reloading
hmr: setup?.config?.hmr || setup?.hmr,
// show logging (defaults on in dev, off in prod)
logging: logging(
!inProduction || setup?.config?.logging || setup?.logging
),
// base path where all the svelte files are kept
root: join(resolve(), setup?.config?.pages ?? setup?.pages ?? "./pages"),
// Port to listen on
port: setup?.config?.port ?? setup?.port ?? null,
// path to public folder... will be served statically
public: existsSync(publicFolder) ? publicFolder : null,
// html template file
template: templateFile,
svelteOptions: setup?.config?.svelteOptions ?? setup?.svelteOptions ?? {},
// chokidar watch locations (just looks for .svelte files) defaults to the main pages directory
watch: setup?.config?.watch ??
setup?.watch ?? [setup?.config?.path ?? setup?.path ?? "./pages"],
// import aliases (not yet enabled)
alias: mapAliases(setup?.config?.alias ?? setup?.alias ?? defaultAliases),
// in prod, minify etc. NODE_ENV
production: inProduction,
// All found routes (will be updated via chokidar)
routes: [],
});
return this;
},
build() {
if (!Object.keys(this.setup).length) {
this.config(); // Initialize all default settings
}
// list all the files
const routes = walkFilesSync(this.setup.root)
.map((file) => createRoute(this.setup.root, file))
.filter((route) => route.params.length === 0); // parameters not available during static site generation (for now?)
generateStaticSite(routes, this.setup).then((files) => {
const htmlBase = join(resolve(), "html");
const jsBase = join(htmlBase, "_js");
files.forEach((file) => {
const assets = [
[join(jsBase, file.bundle.dom), get(file.bundle.dom)],
[join(jsBase, file.bundle.iife), get(file.bundle.iife)],
[join(htmlBase, file.route.url, "index.html"), file.template],
];
assets.forEach(([path, contents]) => {
if (!existsSync(dirname(path))) {
mkdirSync(dirname(path), { recursive: true });
}
writeFileSync(path, contents);
});
});
// Copy static assets from public folder
const staticAssets = walkFilesSync(join(this.setup.public));
staticAssets.forEach((asset) => {
writeFileSync(
asset.replace(this.setup.public, htmlBase),
readFileSync(asset)
);
});
});
},
/**
* Starts serving the svelte files
*
* @param {number?} port
*/
listen(port = this.setup?.port ?? null) {
if (!Object.keys(this.setup).length) {
this.config(); // Initialize all default settings
}
if (this.setup.hmr) {
const contents = readFileSync(join(__dirname, "client.js"));
put("hmr-client.js", contents);
}
/**
* Base 'pages' path is the only required file.
* Can be renamed, but needs to exist in some form
*/
if (!existsSync(this.setup.root)) {
mkdirSync(this.setup.root);
}
// listen() port overrides all
const options = this.setup;
options.port = port;
const app = new Koa();
app.env = this.setup.production ? "production" : "development";
const server = http.createServer(app.callback());
const watcher = setupWatcher({ options });
[
applyRouteContextMiddleware,
applyPublicMiddleware,
applySSRMiddleware,
applyBundledJSMiddleware,
applyWebsocketMiddleware,
start,
].reduce((serverOptions, m) => (m(serverOptions), serverOptions), {
app,
options,
server,
watcher,
});
},
};
export default svelteServer;