74 lines
1.6 KiB
JavaScript
Executable File
74 lines
1.6 KiB
JavaScript
Executable File
'use strict';
|
|
|
|
const Registry = require('./registry');
|
|
const { isObject } = require('./util');
|
|
const { validateMetricName, validateLabelName } = require('./validation');
|
|
|
|
/**
|
|
* @abstract
|
|
*/
|
|
class Metric {
|
|
constructor(config, defaults = {}) {
|
|
if (!isObject(config)) {
|
|
throw new TypeError('constructor expected a config object');
|
|
}
|
|
Object.assign(
|
|
this,
|
|
{
|
|
labelNames: [],
|
|
registers: [Registry.globalRegistry],
|
|
aggregator: 'sum',
|
|
enableExemplars: false,
|
|
},
|
|
defaults,
|
|
config,
|
|
);
|
|
if (!this.registers) {
|
|
// in case config.registers is `undefined`
|
|
this.registers = [Registry.globalRegistry];
|
|
}
|
|
if (!this.help) {
|
|
throw new Error('Missing mandatory help parameter');
|
|
}
|
|
if (!this.name) {
|
|
throw new Error('Missing mandatory name parameter');
|
|
}
|
|
if (!validateMetricName(this.name)) {
|
|
throw new Error('Invalid metric name');
|
|
}
|
|
if (!validateLabelName(this.labelNames)) {
|
|
throw new Error('Invalid label name');
|
|
}
|
|
|
|
if (this.collect && typeof this.collect !== 'function') {
|
|
throw new Error('Optional "collect" parameter must be a function');
|
|
}
|
|
|
|
if (this.labelNames) {
|
|
this.sortedLabelNames = [...this.labelNames].sort();
|
|
} else {
|
|
this.sortedLabelNames = [];
|
|
}
|
|
|
|
this.reset();
|
|
|
|
for (const register of this.registers) {
|
|
if (
|
|
this.enableExemplars &&
|
|
register.contentType === Registry.PROMETHEUS_CONTENT_TYPE
|
|
) {
|
|
throw new TypeError(
|
|
'Exemplars are supported only on OpenMetrics registries',
|
|
);
|
|
}
|
|
register.registerMetric(this);
|
|
}
|
|
}
|
|
|
|
reset() {
|
|
/* abstract */
|
|
}
|
|
}
|
|
|
|
module.exports = { Metric };
|