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collector.ts
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collector.ts
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import { Labels, Metric, MetricValue } from './types';
import { findExistingMetric } from './utils';
export abstract class Collector<T extends MetricValue> {
private readonly data: Metric<T>[];
constructor() {
this.data = [];
}
get(labels?: Labels): Metric<T> | undefined {
return findExistingMetric<T>(labels, this.data);
}
set(value: T, labels?: Labels): this {
const existing = findExistingMetric(labels, this.data);
if (existing) {
existing.value = value;
} else {
this.data.push({
labels,
value,
});
}
return this;
}
collect(labels?: Labels): Metric<T>[] {
if (!labels) {
return this.data;
}
return this.data.filter((item) => {
if (!item.labels) {
return false;
}
const entries = Object.entries(labels);
for (let i = 0; i < entries.length; i += 1) {
const [label, value] = entries[i];
if (item.labels[label] !== value) {
return false;
}
}
return true;
});
}
resetAll(): this {
for (let i = 0; i < this.data.length; i += 1) {
this.reset(this.data[i].labels);
}
return this;
}
abstract reset(labels?: Labels): void;
}