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processHandles.js
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processHandles.js
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'use strict';
const { aggregateByObjectName } = require('./helpers/processMetricsHelpers');
const { updateMetrics } = require('./helpers/processMetricsHelpers');
const Gauge = require('../gauge');
const NODEJS_ACTIVE_HANDLES = 'nodejs_active_handles';
const NODEJS_ACTIVE_HANDLES_TOTAL = 'nodejs_active_handles_total';
module.exports = (registry, config = {}) => {
// Don't do anything if the function is removed in later nodes (exists in node@6)
if (typeof process._getActiveHandles !== 'function') {
return () => {};
}
const namePrefix = config.prefix ? config.prefix : '';
const gauge = new Gauge({
name: namePrefix + NODEJS_ACTIVE_HANDLES,
help:
'Number of active libuv handles grouped by handle type. Every handle type is C++ class name.',
labelNames: ['type'],
registers: registry ? [registry] : undefined
});
const totalGauge = new Gauge({
name: namePrefix + NODEJS_ACTIVE_HANDLES_TOTAL,
help: 'Total number of active handles.',
registers: registry ? [registry] : undefined
});
return () => {
const handles = process._getActiveHandles();
updateMetrics(gauge, aggregateByObjectName(handles));
totalGauge.set(handles.length);
};
};
module.exports.metricNames = [
NODEJS_ACTIVE_HANDLES,
NODEJS_ACTIVE_HANDLES_TOTAL
];