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runtime.ts
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runtime.ts
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import type { SnowpackDevServer, ServerRuntime as SnowpackServerRuntime, LoadResult as SnowpackLoadResult } from 'snowpack';
import type { AstroConfig } from './@types/astro';
import type { LogOptions } from './logger';
import type { CompileError } from './parser/utils/error.js';
import { info, error, parseError } from './logger.js';
import { existsSync, promises as fsPromises } from 'fs';
import { loadConfiguration, startServer as startSnowpackServer } from 'snowpack';
const { readFile } = fsPromises;
interface RuntimeConfig {
astroConfig: AstroConfig;
logging: LogOptions;
snowpack: SnowpackDevServer;
snowpackRuntime: SnowpackServerRuntime;
}
type LoadResultSuccess = {
statusCode: 200;
contents: string | Buffer;
contentType?: string | false;
};
type LoadResultNotFound = { statusCode: 404; error: Error };
type LoadResultError = { statusCode: 500 } & ({ type: 'parse-error'; error: CompileError } | { type: 'unknown'; error: Error });
export type LoadResult = LoadResultSuccess | LoadResultNotFound | LoadResultError;
async function load(config: RuntimeConfig, rawPathname: string | undefined): Promise<LoadResult> {
const { logging, snowpack, snowpackRuntime } = config;
const { astroRoot } = config.astroConfig;
const fullurl = new URL(rawPathname || '/', 'https://example.org/');
const reqPath = decodeURI(fullurl.pathname);
const selectedPage = reqPath.substr(1) || 'index';
info(logging, 'access', reqPath);
const selectedPageLoc = new URL(`./pages/${selectedPage}.astro`, astroRoot);
const selectedPageMdLoc = new URL(`./pages/${selectedPage}.md`, astroRoot);
const selectedPageUrl = `/_astro/pages/${selectedPage}.js`;
// Non-Astro pages (file resources)
if (!existsSync(selectedPageLoc) && !existsSync(selectedPageMdLoc)) {
try {
const result = await snowpack.loadUrl(reqPath);
// success
return {
statusCode: 200,
...result,
};
} catch (err) {
// build error
if (err.failed) {
return { statusCode: 500, type: 'unknown', error: err };
}
// not found
return { statusCode: 404, error: err };
}
}
try {
const mod = await snowpackRuntime.importModule(selectedPageUrl);
const html = (await mod.exports.__renderPage({
request: {
host: fullurl.hostname,
path: fullurl.pathname,
href: fullurl.toString(),
},
children: [],
props: {},
})) as string;
return {
statusCode: 200,
contents: html,
};
} catch (err) {
switch (err.code) {
case 'parse-error': {
return {
statusCode: 500,
type: 'parse-error',
error: err,
};
}
default: {
return {
statusCode: 500,
type: 'unknown',
error: err,
};
}
}
}
}
export async function createRuntime(astroConfig: AstroConfig, logging: LogOptions) {
const { projectRoot, astroRoot, extensions } = astroConfig;
const internalPath = new URL('./frontend/', import.meta.url);
// Workaround for SKY-251
const astroPlugOptions: {
resolve?: (s: string) => string;
extensions?: Record<string, string>;
} = { extensions };
if (existsSync(new URL('./package-lock.json', projectRoot))) {
const pkgLockStr = await readFile(new URL('./package-lock.json', projectRoot), 'utf-8');
const pkgLock = JSON.parse(pkgLockStr);
astroPlugOptions.resolve = (pkgName: string) => {
const ver = pkgLock.dependencies[pkgName].version;
return `/_snowpack/pkg/${pkgName}.v${ver}.js`;
};
}
const snowpackConfig = await loadConfiguration({
root: projectRoot.pathname,
mount: {
[astroRoot.pathname]: '/_astro',
[internalPath.pathname]: '/_astro_internal',
},
plugins: [[new URL('../snowpack-plugin.cjs', import.meta.url).pathname, astroPlugOptions]],
devOptions: {
open: 'none',
output: 'stream',
port: 0,
},
packageOptions: {
knownEntrypoints: ['preact-render-to-string'],
external: ['@vue/server-renderer', 'node-fetch'],
},
});
const snowpack = await startSnowpackServer({
config: snowpackConfig,
lockfile: null,
});
const snowpackRuntime = snowpack.getServerRuntime();
const runtimeConfig: RuntimeConfig = {
astroConfig,
logging,
snowpack,
snowpackRuntime,
};
return {
load: load.bind(null, runtimeConfig),
shutdown: () => snowpack.shutdown(),
};
}