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app.js
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app.js
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const Koa = require("koa");
const Router = require("@koa/router");
const compress = require("koa-compress");
const SSSR = require("./index");
const NO_CACHE_HEADER = "x-sssr-no-cache";
const REQUEST_PATTERN = "/:url(.*)";
/**
* @param {Number} workers
* @returns {Application}
*/
function init(workers = 1) {
const app = new Koa();
const router = new Router();
const sssr = new SSSR(workers);
router.get(REQUEST_PATTERN, async (ctx) => {
const options = {
headers: ctx.headers,
};
const useCache = !Number(ctx.get(NO_CACHE_HEADER));
const { status, content } = await sssr.get(parseUrlString(ctx), options, useCache);
ctx.status = status;
ctx.body = content;
});
router.del(REQUEST_PATTERN, async (ctx) => {
const { status } = await sssr.forget(parseUrlString(ctx));
ctx.status = status;
});
app.use(compress());
app.use(router.routes());
app.use(router.allowedMethods());
return app;
}
/**
* @param {Object} ctx
* @returns {string}
*/
function parseUrlString(ctx) {
let urlString = ctx.params.url;
if (ctx.querystring) {
urlString += `?${ctx.querystring}`;
}
return urlString;
}
module.exports = init;