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metrics: improve fetch response metrics

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Alex Gleason 2024-09-23 21:29:50 -05:00
parent f8fcb9ac77
commit 6a8b22d018
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2 changed files with 13 additions and 6 deletions
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6
src/metrics.ts
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@ -27,10 +27,10 @@ export const streamingClientMessagesCounter = new Counter({
help: 'Total number of messages received by the streaming API', help: 'Total number of messages received by the streaming API',
}); });
export const fetchCounter = new Counter({ export const fetchResponsesCounter = new Counter({
name: 'ditto_fetch_total', name: 'ditto_fetch_responses_total',
help: 'Total number of fetch requests', help: 'Total number of fetch requests',
labelNames: ['method'], labelNames: ['method', 'status'],
}); });
export const firehoseEventsCounter = new Counter({ export const firehoseEventsCounter = new Counter({

13
src/workers/fetch.ts
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@ -3,7 +3,7 @@ import * as Comlink from 'comlink';
import { FetchWorker } from './fetch.worker.ts'; import { FetchWorker } from './fetch.worker.ts';
import './handlers/abortsignal.ts'; import './handlers/abortsignal.ts';
import { fetchCounter } from '@/metrics.ts'; import { fetchResponsesCounter } from '@/metrics.ts';
const worker = new Worker(new URL('./fetch.worker.ts', import.meta.url), { type: 'module' }); const worker = new Worker(new URL('./fetch.worker.ts', import.meta.url), { type: 'module' });
const client = Comlink.wrap<typeof FetchWorker>(worker); const client = Comlink.wrap<typeof FetchWorker>(worker);
@ -23,11 +23,18 @@ const ready = new Promise<void>((resolve) => {
*/ */
const fetchWorker: typeof fetch = async (...args) => { const fetchWorker: typeof fetch = async (...args) => {
await ready; await ready;
const [url, init] = serializeFetchArgs(args); const [url, init] = serializeFetchArgs(args);
const { body, signal, ...rest } = init; const { body, signal, ...rest } = init;
fetchCounter.inc({ method: init.method });
const result = await client.fetch(url, { ...rest, body: await prepareBodyForWorker(body) }, signal); const result = await client.fetch(url, { ...rest, body: await prepareBodyForWorker(body) }, signal);
return new Response(...result); const response = new Response(...result);
const { method } = init;
const { status } = response;
fetchResponsesCounter.inc({ method, status });
return response;
}; };
/** Take arguments to `fetch`, and turn them into something we can send over Comlink. */ /** Take arguments to `fetch`, and turn them into something we can send over Comlink. */