wehub-resource-sync
68 lines
2.1 KiB
TypeScript
68 lines
2.1 KiB
TypeScript
import type { createInMemoryMetrics } from "./utils/tracing";
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type MetricsHelper = ReturnType<typeof createInMemoryMetrics>;
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// With cumulative temporality the latest export carries running totals for every instrument.
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export async function latestMetrics(helper: MetricsHelper) {
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const all = await helper.getMetrics();
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return all[all.length - 1];
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}
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export function findMetric(resourceMetrics: any, name: string): any | undefined {
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if (!resourceMetrics) return undefined;
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for (const scopeMetrics of resourceMetrics.scopeMetrics) {
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for (const metric of scopeMetrics.metrics) {
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if (metric.descriptor.name === name) return metric;
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}
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}
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return undefined;
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}
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function pointValue(dp: any): number {
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const value = dp.value;
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if (typeof value === "number") return value;
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// Histogram / ExponentialHistogram data point
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return value?.sum ?? 0;
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}
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function matches(dp: any, attrs?: Record<string, string>): boolean {
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if (!attrs) return true;
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return Object.entries(attrs).every(([k, v]) => String(dp.attributes?.[k]) === v);
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}
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export function metricSum(
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resourceMetrics: any,
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name: string,
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attrs?: Record<string, string>
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): number {
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const metric = findMetric(resourceMetrics, name);
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if (!metric) return 0;
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return metric.dataPoints
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.filter((dp: any) => matches(dp, attrs))
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.reduce((acc: number, dp: any) => acc + pointValue(dp), 0);
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}
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export function histogramCount(
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resourceMetrics: any,
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name: string,
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attrs?: Record<string, string>
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): number {
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const metric = findMetric(resourceMetrics, name);
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if (!metric) return 0;
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return metric.dataPoints
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.filter((dp: any) => matches(dp, attrs))
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.reduce((acc: number, dp: any) => acc + (dp.value?.count ?? 0), 0);
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}
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export function gaugeValue(
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resourceMetrics: any,
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name: string,
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attrs?: Record<string, string>
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): number | undefined {
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const metric = findMetric(resourceMetrics, name);
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if (!metric) return undefined;
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const points = metric.dataPoints.filter((dp: any) => matches(dp, attrs));
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if (points.length === 0) return undefined;
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return Math.max(...points.map((dp: any) => pointValue(dp)));
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}
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