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prometheus.ts
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prometheus.ts
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import { collectDefaultMetrics, Gauge, register } from "prom-client";
import { createServer } from "http";
import WebSocket from "ws";
import { DownloaderVersion, settings } from "./helpers.js";
collectDefaultMetrics();
new Gauge({
name: "instance",
help: "Floatplane Downloader instances",
labelNames: ["version"],
})
.labels({ version: DownloaderVersion })
.set(1);
export const initProm = (instance: string) => {
if (settings.metrics.contributeMetrics) {
const connect = () => {
const socket = new WebSocket("ws://targets.monitor.spookelton.net");
socket.on("open", () => socket.send(instance));
socket.on("ping", async () => socket.send(await register.metrics()));
socket.on("error", () => socket.close());
socket.on("close", () => {
socket.close();
setTimeout(connect, 1000);
});
};
connect();
}
if (settings.metrics.prometheusExporterPort !== null) {
const httpServer = createServer(async (req, res) => {
if (req.url === "/metrics") {
try {
res.setHeader("Content-Type", register.contentType);
res.end(await register.metrics());
} catch (err) {
res.statusCode = 500;
res.end((<Error>err)?.message);
}
} else {
res.statusCode = 404;
res.end("Not found");
}
});
httpServer.listen(settings.metrics.prometheusExporterPort);
}
};