/
index.ts
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/
index.ts
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import type {
AstroMiddlewareInstance,
AstroSettings,
ComponentInstance,
MiddlewareResponseHandler,
RouteData,
SSRElement,
SSRLoadedRenderer,
} from '../../../@types/astro';
import { PAGE_SCRIPT_ID } from '../../../vite-plugin-scripts/index.js';
import { createAPIContext } from '../../endpoint/index.js';
import { enhanceViteSSRError } from '../../errors/dev/index.js';
import { AggregateError, CSSError, MarkdownError } from '../../errors/index.js';
import { callMiddleware } from '../../middleware/callMiddleware.js';
import type { ModuleLoader } from '../../module-loader/index';
import { isPage, resolveIdToUrl, viteID } from '../../util.js';
import { createRenderContext, renderPage as coreRenderPage } from '../index.js';
import { filterFoundRenderers, loadRenderer } from '../renderer.js';
import { getStylesForURL } from './css.js';
import type { DevelopmentEnvironment } from './environment';
import { getComponentMetadata } from './metadata.js';
import { getScriptsForURL } from './scripts.js';
export { createDevelopmentEnvironment } from './environment.js';
export type { DevelopmentEnvironment };
export interface SSROptions {
/** The environment instance */
env: DevelopmentEnvironment;
/** location of file on disk */
filePath: URL;
/** production website */
origin: string;
/** the web request (needed for dynamic routes) */
pathname: string;
/** The renderers and instance */
preload: ComponentPreload;
/** Request */
request: Request;
/** optional, in case we need to render something outside of a dev server */
route?: RouteData;
/**
* Optional middlewares
*/
middleware?: AstroMiddlewareInstance<unknown>;
}
export type ComponentPreload = [SSRLoadedRenderer[], ComponentInstance];
export async function loadRenderers(
moduleLoader: ModuleLoader,
settings: AstroSettings
): Promise<SSRLoadedRenderer[]> {
const loader = (entry: string) => moduleLoader.import(entry);
const renderers = await Promise.all(settings.renderers.map((r) => loadRenderer(r, loader)));
return filterFoundRenderers(renderers);
}
export async function preload({
env,
filePath,
}: Pick<SSROptions, 'env' | 'filePath'>): Promise<ComponentPreload> {
// Important: This needs to happen first, in case a renderer provides polyfills.
const renderers = await loadRenderers(env.loader, env.settings);
try {
// Load the module from the Vite SSR Runtime.
const mod = (await env.loader.import(viteID(filePath))) as ComponentInstance;
return [renderers, mod];
} catch (error) {
// If the error came from Markdown or CSS, we already handled it and there's no need to enhance it
if (MarkdownError.is(error) || CSSError.is(error) || AggregateError.is(error)) {
throw error;
}
throw enhanceViteSSRError({ error, filePath, loader: env.loader, renderers });
}
}
interface GetScriptsAndStylesParams {
env: DevelopmentEnvironment;
filePath: URL;
}
async function getScriptsAndStyles({ env, filePath }: GetScriptsAndStylesParams) {
// Add hoisted script tags
const scripts = await getScriptsForURL(filePath, env.settings.config.root, env.loader);
// Inject HMR scripts
if (isPage(filePath, env.settings) && env.mode === 'development') {
scripts.add({
props: { type: 'module', src: '/@vite/client' },
children: '',
});
scripts.add({
props: {
type: 'module',
src: await resolveIdToUrl(env.loader, 'astro/runtime/client/hmr.js'),
},
children: '',
});
}
// TODO: We should allow adding generic HTML elements to the head, not just scripts
for (const script of env.settings.scripts) {
if (script.stage === 'head-inline') {
scripts.add({
props: {},
children: script.content,
});
} else if (script.stage === 'page' && isPage(filePath, env.settings)) {
scripts.add({
props: { type: 'module', src: `/@id/${PAGE_SCRIPT_ID}` },
children: '',
});
}
}
// Pass framework CSS in as style tags to be appended to the page.
const { urls: styleUrls, stylesMap } = await getStylesForURL(filePath, env.loader, env.mode);
let links = new Set<SSRElement>();
[...styleUrls].forEach((href) => {
links.add({
props: {
rel: 'stylesheet',
href,
},
children: '',
});
});
let styles = new Set<SSRElement>();
[...stylesMap].forEach(([url, content]) => {
// Vite handles HMR for styles injected as scripts
scripts.add({
props: {
type: 'module',
src: url,
},
children: '',
});
// But we still want to inject the styles to avoid FOUC
styles.add({
props: {
type: 'text/css',
// Track the ID so we can match it to Vite's injected style later
'data-astro-dev-id': viteID(new URL(`.${url}`, env.settings.config.root)),
},
children: content,
});
});
const metadata = await getComponentMetadata(filePath, env.loader);
return { scripts, styles, links, metadata };
}
export async function renderPage(options: SSROptions): Promise<Response> {
const [renderers, mod] = options.preload;
// Override the environment's renderers. This ensures that if renderers change (HMR)
// The new instances are passed through.
options.env.renderers = renderers;
const { scripts, links, styles, metadata } = await getScriptsAndStyles({
env: options.env,
filePath: options.filePath,
});
const { env } = options;
const renderContext = await createRenderContext({
request: options.request,
origin: options.origin,
pathname: options.pathname,
scripts,
links,
styles,
componentMetadata: metadata,
route: options.route,
mod,
env,
});
if (options.middleware) {
if (options.middleware && options.middleware.onRequest) {
const apiContext = createAPIContext({
request: options.request,
params: renderContext.params,
props: renderContext.props,
adapterName: options.env.adapterName,
});
const onRequest = options.middleware.onRequest as MiddlewareResponseHandler;
const response = await callMiddleware<Response>(env.logging, onRequest, apiContext, () => {
return coreRenderPage({ mod, renderContext, env: options.env, apiContext });
});
return response;
}
}
return await coreRenderPage({ mod, renderContext, env: options.env }); // NOTE: without "await", errors won’t get caught below
}