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@caub caub/express.js
Created Jun 8, 2019

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const fetch = require('node-fetch');
const http = require('http');
class Express {
constructor(
notFoundHandler = (req, res) => {
res.statusCode = 404;
res.write('not found');
res.end()
},
errorHandler = (req, res, err = {}) => {
if (res.headersSent) { res.end(); return; }
res.statusCode = err.status || 500;
res.write(err.message || 'error');
res.end()
}
) {
this.stacks = [];
this.server = http.createServer(async (req, res) => {
try {
for (const { method, path, handler } of this.stacks) {
if (!method || method === req.method) {
const m = req.url.match(path);
if (m) {
await handler(req, res, m);
}
}
}
} catch (err) {
console.log('ERR', err);
errorHandler(req, res, err);
}
if (!res.headersSent) {
notFoundHandler(req, res);
}
});
}
use(path, handler) { this.stacks.push({ path, handler }) }
get(path, handler) { this.stacks.push({ method: 'GET', path, handler }) }
put(path, handler) { this.stacks.push({ method: 'PUT', path, handler }) }
del(path, handler) { this.stacks.push({ method: 'DELETE', path, handler }) }
post(path, handler) { this.stacks.push({ method: 'POST', path, handler }) }
patch(path, handler) { this.stacks.push({ method: 'PATCH', path, handler }) }
copy(path, handler) { this.stacks.push({ method: 'COPY', path, handler }) }
listen(port) {
return new Promise((resolve, reject) => this.server.listen(port, err => err ? reject(err) : resolve(this.server)));
}
close() {
return this.server.close();
}
}
(async () => {
try {
const app = new Express()
app.use(/^\//, async (req, res) => {
console.log('just logging stuff', req.url);
});
app.get(/^\/foo/, async (req, res) => {
res.write('foo');
res.end();
throw new Error('7');
});
app.get(/^\/bar/, async (req, res) => {
res.write('bar');
res.end();
});
await app.listen(3000);
const r = await fetch('http://localhost:3000/foo');
console.log(1, r.status, await r.text());
app.close();
} catch (err) {
console.error(err);
}
})()
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