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51 lines
1.8 KiB
TypeScript
51 lines
1.8 KiB
TypeScript
import { hostname } from 'os';
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import { AggregatorRegistry, Metric } from 'prom-client';
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import { Context, Handler, SystemModel } from 'hydrooj';
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import { createRegistry } from './metrics';
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declare module 'hydrooj' {
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interface EventMap {
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metrics: (id: string, metrics: any) => void;
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}
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interface SystemKeys {
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'prom-client.name': string;
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'prom-client.password': string;
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'prom-client.collect_rate': number;
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}
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}
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const instances: Record<string, Metric[]> = {};
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class MetricsHandler extends Handler {
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noCheckPermView = true;
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notUsage = true;
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async get() {
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if (!this.request.headers.authorization) {
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this.response.status = 401;
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this.response.body = {};
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this.response.addHeader('WWW-Authenticate', 'Basic');
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return;
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}
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const [name, password] = SystemModel.getMany(['prom-client.name', 'prom-client.password']);
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const key = this.request.headers.authorization.split('Basic ')?.[1];
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if (!key || key !== Buffer.from(`${name}:${password}`).toString('base64')) {
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this.response.status = 403;
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this.response.body = {};
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return;
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}
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this.response.body = await AggregatorRegistry.aggregate(Object.values(instances)).metrics();
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this.response.type = 'text/plain';
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}
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}
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export function apply(ctx: Context) {
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if (process.env.HYDRO_CLI) return;
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const registry = createRegistry(ctx);
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ctx.on('metrics', (id, metrics) => { instances[id] = metrics; });
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ctx.setInterval(async () => {
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ctx.broadcast('metrics', `${hostname()}/${process.env.NODE_APP_INSTANCE}`, await registry.getMetricsAsJSON());
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}, 5000 * (+SystemModel.get('prom-client.collect_rate') || 1));
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ctx.Route('metrics', '/metrics', MetricsHandler);
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}
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