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Cache valid responses for 500 ms

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This commit is contained in:
Raul Ochoa 2016-10-20 12:06:51 +02:00
parent d3f3d5ca36
commit 5185c1e225
1 changed files with 16 additions and 2 deletions
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18
batch/scheduler/capacity/http-simple.js
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@ -6,6 +6,9 @@ var debug = require('../../util/debug')('capacity-http-simple');
function HttpSimpleCapacity(host, capacityEndpoint) {
this.host = host;
this.capacityEndpoint = capacityEndpoint;
this.lastResponse = null;
this.lastResponseTime = 0;
}
module.exports = HttpSimpleCapacity;
@ -36,13 +39,24 @@ HttpSimpleCapacity.prototype.getResponse = function(callback) {
json: true
};
debug('getCapacity(%s)', this.host);
// throttle requests for 500 ms
var now = Date.now();
if (this.lastResponse !== null && ((now - this.lastResponseTime) < 500)) {
return callback(null, this.lastResponse);
}
request.post(requestParams, function(err, res, jsonRes) {
if (err) {
return callback(err);
}
if (jsonRes && jsonRes.retcode === 0) {
return callback(null, jsonRes.return_values || {});
this.lastResponse = jsonRes.return_values || {};
// We could go more aggressive by updating lastResponseTime on failures.
this.lastResponseTime = now;
return callback(null, this.lastResponse);
}
return callback(new Error('Could not retrieve information from endpoint'));
});
}.bind(this));
};