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The idea is not new, implementation probably too. I just saw this https://github.com/lloyd/node-toobusy and found it useful. This projects does pretty the same but in pure javascript.
var busy = require('busy'),
express = require('express');
var app = express();
var busyCheck = busy(function(amount) {
console.log('Loop was busy for', amount, 'ms');
});
// middleware which blocks requests when we're too busy
app.use(function(req, res, next) {
if (busyCheck.blocked) {
res.send(503, "I'm busy right now, sorry.");
} else {
next();
}
});
app.get('/', function(req, res) {
// processing the request requires some work!
var i = 0;
while (i < 1e5) i++;
res.send("I counted to " + i);
});
var server = app.listen(3000);
process.on('SIGINT', function() {
server.close();
// calling .stop allows your process to exit normally
busyCheck.stop();
process.exit();
});
busy([options], [callback])
Optional options:
- `max` max time in ms alowed to be busy, default is 100ms
- `interval` how often to check the state in ms, default is 50ms
Optional callback is called every time the event loop was busy for longer amount of time than defined in max
. Passed value is amount of ms the loop was blocked for.
var busyCheck = busy();
busyCheck.blocked; // Is true if by the last check, max was exceeded
busyCheck.blockedFor; // Number in ms the loop was blocked for, during the last check
busyCheck.stop(); // Stop doing checks
FAQs
Detect if event loop is busy.
The npm package busy receives a total of 339 weekly downloads. As such, busy popularity was classified as not popular.
We found that busy demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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