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Record HTTP response time metrics

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Alex Gleason
2024-10-10 13:20:03 -05:00
parent df8004e261
commit 81c28825a8
4 changed files with 22 additions and 1 deletions
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1
deno.json
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@@ -36,6 +36,7 @@
"@b-fuze/deno-dom": "jsr:@b-fuze/deno-dom@^0.1.47",
"@bradenmacdonald/s3-lite-client": "jsr:@bradenmacdonald/s3-lite-client@^0.7.4",
"@electric-sql/pglite": "npm:@electric-sql/pglite@^0.2.8",
"@esroyo/scoped-performance": "jsr:@esroyo/scoped-performance@^3.1.0",
"@gfx/canvas-wasm": "jsr:@gfx/canvas-wasm@^0.4.2",
"@hono/hono": "jsr:@hono/hono@^4.4.6",
"@isaacs/ttlcache": "npm:@isaacs/ttlcache@^1.4.1",

5
deno.lock generated
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@@ -4,6 +4,7 @@
"jsr:@b-fuze/deno-dom@~0.1.47": "0.1.48",
"jsr:@bradenmacdonald/s3-lite-client@~0.7.4": "0.7.6",
"jsr:@denosaurs/plug@1.0.3": "1.0.3",
"jsr:@esroyo/scoped-performance@^3.1.0": "3.1.0",
"jsr:@gfx/canvas-wasm@~0.4.2": "0.4.2",
"jsr:@gleasonator/policy@*": "0.2.0",
"jsr:@gleasonator/policy@0.2.0": "0.2.0",
@@ -142,6 +143,9 @@
"jsr:@std/path@0.213.1"
]
},
"@esroyo/scoped-performance@3.1.0": {
"integrity": "e6a12a1d4edb32cbea7afce005123c1ef684e1815bf9b6caadfbf3e89fe66222"
},
"@gfx/canvas-wasm@0.4.2": {
"integrity": "d653be3bd12cb2fa9bbe5d1b1f041a81b91d80b68502761204aaf60e4592532a",
"dependencies": [
@@ -2062,6 +2066,7 @@
"dependencies": [
"jsr:@b-fuze/deno-dom@~0.1.47",
"jsr:@bradenmacdonald/s3-lite-client@~0.7.4",
"jsr:@esroyo/scoped-performance@^3.1.0",
"jsr:@gfx/canvas-wasm@~0.4.2",
"jsr:@hono/hono@^4.4.6",
"jsr:@lambdalisue/async@^2.1.1",

6
src/metrics.ts
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@@ -12,6 +12,12 @@ export const httpResponsesCounter = new Counter({
labelNames: ['method', 'path', 'status'],
});
export const httpResponseDurationHistogram = new Histogram({
name: 'ditto_http_response_duration_seconds',
help: 'Histogram of HTTP response times in seconds',
labelNames: ['method', 'path', 'status'],
});
export const streamingConnectionsGauge = new Gauge({
name: 'ditto_streaming_connections',
help: 'Number of active connections to the streaming API',

11
src/middleware/metricsMiddleware.ts
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@@ -1,9 +1,14 @@
import { ScopedPerformance } from '@esroyo/scoped-performance';
import { MiddlewareHandler } from '@hono/hono';
import { httpRequestsCounter, httpResponsesCounter } from '@/metrics.ts';
import { httpRequestsCounter, httpResponseDurationHistogram, httpResponsesCounter } from '@/metrics.ts';
/** Prometheus metrics middleware that tracks HTTP requests by methods and responses by status code. */
export const metricsMiddleware: MiddlewareHandler = async (c, next) => {
// Start a timer to measure the duration of the response.
using perf = new ScopedPerformance();
perf.mark('start');
// HTTP Request.
const { method } = c.req;
httpRequestsCounter.inc({ method });
@@ -17,4 +22,8 @@ export const metricsMiddleware: MiddlewareHandler = async (c, next) => {
// Tries to find actual route names first before falling back on potential middleware handlers like `app.use('*')`.
const path = c.req.matchedRoutes.find((r) => r.method !== 'ALL')?.path ?? c.req.routePath;
httpResponsesCounter.inc({ method, status, path });
// Measure the duration of the response.
const { duration } = perf.measure('total', 'start');
httpResponseDurationHistogram.observe({ method, status, path }, duration / 1000);
};