feat: Add prometheus middleware to express

This enables collecting metrics from node.js and express.
2025-12-18 04:06:19 +00:00 · 2021-06-02 10:02:44 +02:00
parent d69ac01bbf
commit b42e911a11
4 changed files with 610 additions and 11 deletions
--- a/package-lock.json
+++ b/package-lock.json
@@ -749,7 +749,6 @@
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@@ -791,7 +790,6 @@
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@@ -818,7 +816,6 @@
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@@ -826,11 +823,18 @@
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@@ -896,8 +900,7 @@
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@@ -968,14 +971,12 @@
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@@ -995,7 +996,6 @@
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@@ -2243,6 +2248,16 @@
        }
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@@ -2443,6 +2458,487 @@
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@@ -4165,6 +4667,12 @@
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+      "version": "0.1.4",
+      "resolved": "http://127.0.0.1:4873/optional/-/optional-0.1.4.tgz",
+      "integrity": "sha512-gtvrrCfkE08wKcgXaVwQVgwEQ8vel2dc5DDBn9RLQZ3YtmtkBss6A2HY6BnJH4N/4Ku97Ri/SF8sNWE2225WJw==",
+      "optional": true
+    },
    "os-tmpdir": {
      "version": "1.0.2",
      "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
@@ -4384,6 +4892,24 @@
      "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
      "integrity": "sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA=="
    },
+    "prom-client": {
+      "version": "12.0.0",
+      "resolved": "http://127.0.0.1:4873/prom-client/-/prom-client-12.0.0.tgz",
+      "integrity": "sha512-JbzzHnw0VDwCvoqf8y1WDtq4wSBAbthMB1pcVI/0lzdqHGJI3KBJDXle70XK+c7Iv93Gihqo0a5LlOn+g8+DrQ==",
+      "requires": {
+        "tdigest": "^0.1.1"
+      }
+    },
+    "prometheus-gc-stats": {
+      "version": "0.6.3",
+      "resolved": "http://127.0.0.1:4873/prometheus-gc-stats/-/prometheus-gc-stats-0.6.3.tgz",
+      "integrity": "sha512-vCX+HZ1jZHkha25r5dAcRSNjue+K3Hn0B33EcZl7y3hgp3o1YsQ4Y3x7oJWKvDdbelFIL0McsXGmRg3zBrmq+g==",
+      "optional": true,
+      "requires": {
+        "gc-stats": "^1.4.0",
+        "optional": "^0.1.3"
+      }
+    },
    "promise-queue": {
      "version": "2.2.5",
      "resolved": "https://registry.npmjs.org/promise-queue/-/promise-queue-2.2.5.tgz",
@@ -4706,6 +5232,15 @@
      "integrity": "sha512-qYg9KP24dD5qka9J47d0aVky0N+b4fTU89LN9iDnjB5waksiC49rvMB0PrUJQGoTmH50XPiqOvAjDfaijGxYZw==",
      "dev": true
    },
+    "response-time": {
+      "version": "2.3.2",
+      "resolved": "http://127.0.0.1:4873/response-time/-/response-time-2.3.2.tgz",
+      "integrity": "sha1-/6cbq5UtYvfB1Jt0NDVfvGjf/Fo=",
+      "requires": {
+        "depd": "~1.1.0",
+        "on-headers": "~1.0.1"
+      }
+    },
    "responselike": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/responselike/-/responselike-2.0.0.tgz",
@@ -5147,6 +5682,14 @@
        "has-flag": "^4.0.0"
      }
    },
+    "tdigest": {
+      "version": "0.1.1",
+      "resolved": "http://127.0.0.1:4873/tdigest/-/tdigest-0.1.1.tgz",
+      "integrity": "sha1-Ljyyw56kSeVdHmzZEReszKRYgCE=",
+      "requires": {
+        "bintrees": "1.0.1"
+      }
+    },
    "temp-dir": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/temp-dir/-/temp-dir-2.0.0.tgz",
@@ -5526,6 +6069,11 @@
        "punycode": "^2.1.0"
      }
    },
+    "url-value-parser": {
+      "version": "2.0.3",
+      "resolved": "http://127.0.0.1:4873/url-value-parser/-/url-value-parser-2.0.3.tgz",
+      "integrity": "sha512-FjIX+Q9lYmDM9uYIGdMYfQW0uLbWVwN2NrL2ayAI7BTOvEwzH+VoDdNquwB9h4dFAx+u6mb0ONLa3sHD5DvyvA=="
+    },
    "utf8-byte-length": {
      "version": "1.0.4",
      "resolved": "https://registry.npmjs.org/utf8-byte-length/-/utf8-byte-length-1.0.4.tgz",
--- a/package.json
+++ b/package.json
@@ -36,11 +36,13 @@
    "@openstapps/core": "0.46.0",
    "@openstapps/core-tools": "0.21.0",
    "@openstapps/logger": "0.7.0",
+    "@types/express-prometheus-middleware": "1.2.0",
    "@types/node": "14.17.1",
    "commander": "7.2.0",
    "config": "3.3.6",
    "cors": "2.8.5",
    "express": "4.17.1",
+    "express-prometheus-middleware": "1.2.0",
    "express-promise-router": "4.1.0",
    "fs-extra": "9.1.0",
    "got": "11.8.2",
@@ -50,6 +52,7 @@
    "node-cache": "5.1.2",
    "node-cron": "3.0.0",
    "nodemailer": "6.6.1",
+    "prom-client": "12.0.0",
    "promise-queue": "2.2.5",
    "sanitize-filename": "1.6.3",
    "ts-node": "9.1.1",
--- a/src/app.ts
+++ b/src/app.ts
@@ -26,6 +26,7 @@ import {Express} from 'express';
 import morgan from 'morgan';
 import {join} from 'path';
 import {configFile, DEFAULT_TIMEOUT, isTestEnvironment, mailer, plugins, validator} from './common';
+import {getPrometheusMiddleware} from './middleware/prometheus';
 import {MailQueue} from './notification/mail-queue';
 import {bulkAddRouter} from './routes/bulk-add-route';
 import {bulkDoneRouter} from './routes/bulk-done-route';
@@ -63,6 +64,10 @@ export async function configureApp(app: Express, databases: {[name: string]: Dat
    }, stream: process.stdout,
  }));

+  if (process.env.PROMETHEUS_MIDDLEWARE === 'true') {
+    app.use(getPrometheusMiddleware());
+  }
+
  const corsOptions = {
    allowedHeaders: [
      'DNT',
--- a/src/middleware/prometheus.ts
+++ b/src/middleware/prometheus.ts
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2021 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {Logger} from '@openstapps/logger';
+import express from 'express';
+import expressPrometheusMiddleware from 'express-prometheus-middleware';
+import fs from 'fs';
+import path from 'path';
+
+type UserOptions = Parameters<typeof expressPrometheusMiddleware>[0];
+
+/**
+ * Create and configure a new Express Prometheus Middleware instance
+ *
+ * This function tries to configure the new instance with JSON read from
+ * `./conf/prometheus.json`. When this fails an instance configured with 
+ * default options is returned.
+ * 
+ * @returns express.Express
+ */
+export function getPrometheusMiddleware(): express.Express {
+  const configFileName = path.join('./config', 'prometheus.json');
+  let options: UserOptions = {};
+
+  try {
+    options = JSON.parse(fs.readFileSync(configFileName, 'utf-8'));
+  } catch(err) {
+    Logger.warn('Could not get options for Prometheus Middleware.', err);
+  }
+
+  return expressPrometheusMiddleware(options);
+}