How to use the async-sema.RateLimit function in async-sema
To help you get started, we’ve selected a few async-sema examples, based on popular ways it is used in public projects.
Secure your code as it's written. Use Snyk Code to scan source code in minutes - no build needed - and fix issues immediately.
zeit / async-sema / examples / rate-limiting.js View on Github 
async function h() {
console.log('Uniform distribution of requests over time');
const n = 50;
const lim = RateLimit(5, { uniformDistribution: true });
const start = process.hrtime();
for (let i = 0; i < n; i++) {
await lim();
process.stdout.write('.');
}
process.stdout.write('\n');
const hrt = process.hrtime(start);
const elapsed = (hrt[0] * 1000 + hrt[1] / 1e6) / 1000;
const rps = n / elapsed;
console.log(rps.toFixed(3) + ' req/s');
}async function g() {
console.log('Custom rate limit time unit');
const n = 20;
const lim = RateLimit(5, { timeUnit: 60 * 1000 });
const start = process.hrtime();
for (let i = 0; i < n; i++) {
await lim();
process.stdout.write('.');
}
process.stdout.write('\n');
const hrt = process.hrtime(start);
const elapsed = (hrt[0] * 1000 + hrt[1] / 1e6) / 1000;
const rps = n / (elapsed / 60);
console.log(rps.toFixed(3) + ' req/min');
}async function f() {
console.log('Naive requests per second rate limiting');
const n = 50;
const lim = RateLimit(5);
const start = process.hrtime();
for (let i = 0; i < n; i++) {
await lim();
process.stdout.write('.');
}
process.stdout.write('\n');
const hrt = process.hrtime(start);
const elapsed = (hrt[0] * 1000 + hrt[1] / 1e6) / 1000;
const rps = n / elapsed;
console.log(rps.toFixed(3) + ' req/s');
}
