diff --git a/.travis.yml b/.travis.yml index 0ec00be..a56b0b4 100644 --- a/.travis.yml +++ b/.travis.yml @@ -1,3 +1,4 @@ language: node_js node_js: - "6" + - "7" diff --git a/README.md b/README.md index 17d5729..c932e7a 100644 --- a/README.md +++ b/README.md @@ -4,27 +4,25 @@ Express middleware with popular prometheus metrics in one bundle. It's also compatible with koa v1 and v2 (see below). -Internally it uses **prom-client**. See: https://github.com/siimon/prom-client +Internally it uses **prom-client**. See: https://github.com/siimon/prom-client (^9.0.0) Included metrics: * `up`: normally is just 1 * `http_request_duration_seconds`: http latency histogram labeled with `status_code`, `method` and `path` -**Please note version 2.x is NOT backwards compatible with 1.x** - ## Install ``` npm install express-prom-bundle ``` -## Usage +## Sample uUsage ```javascript const promBundle = require("express-prom-bundle"); -const metricsMiddleware = promBundle({/* options */ }); const app = require("express")(); +const metricsMiddleware = promBundle({includeMethod: true}); app.use(metricsMiddleware); app.use(/* your middleware */); @@ -44,17 +42,31 @@ See the example below. ## Options -* **buckets**: buckets used for `http_request_seconds` histogram -* **includeMethod**: include HTTP method (GET, PUT, ...) as a label to `http_request_duration_seconds` -* **includePath**: include URL path as a label (see below) -* **normalizePath**: boolean or `function(req)` - path normalization for `includePath` option +Which labels to include in `http_request_duration_seconds` metric: + +* **includeStatusCode**: HTTP status code (200, 400, 404 etc.), default: **true** +* **includeMethod**: HTTP method (GET, PUT, ...), default: **false** +* **includePath**: URL path (see importent details below), default: **false** + +Extra transformation callbacks: + +* **normalizePath**: `function(req)` generates path values from express `req` (see details below) +* **formatStatusCode**: `function(res)` producing final status code from express `res` object, e.g. you can combine `200`, `201` and `204` to just `2xx`. + +Other options: + +* **buckets**: buckets used for `http_request_duration_seconds` histogram * **autoregister**: if `/metrics` endpoint should be registered. (Default: **true**) -* **whitelist**, **blacklist**: array of strings or regexp specifying which metrics to include/exclude -* **excludeRoutes**: (deprecated) array of strings or regexp specifying which routes should be skipped for `http_request_duration_seconds` metric. It uses `req.originalUrl` as subject when checking. You want normally use express or meddleware features instead of this options. + +Deprecated: + +* **whitelist**, **blacklist**: array of strings or regexp specifying which metrics to include/exclude (there are only 2 metrics) +* **excludeRoutes**: array of strings or regexp specifying which routes should be skipped for `http_request_duration_seconds` metric. It uses `req.originalUrl` as subject when checking. You want to use express or meddleware features instead of this option. ### More details on includePath option -The goal is to have separate latency statistics by URL path, e.g. `/my-app/user/`, `/products/by-category` etc. +Let's say you want to have latency statistics by URL path, +e.g. separate metrics for `/my-app/user/`, `/products/by-category` etc. Just taking `req.path` as a label value won't work as IDs are often part of the URL, like `/user/12352/profile`. So what we actually need is a path template. @@ -65,8 +77,6 @@ normalized to `/user/#val/profile` and that will become the value for the label. You can override this magical behavior and define your own function by providing an optional callback using **normalizePath** option. You can also replace the default **normalizePath** function globally. -This is handy if the rest of the middleware is done elsewhere -e.g. via `kraken.js meddleware`. ```javascript app.use(promBundle(/* options? */)); @@ -160,7 +170,9 @@ Here is meddleware config sample, which can be used in a standard **kraken.js** * **3.0.0** * upgrade dependencies, most notably **prom-client** to 9.0.0 * switch to koa v2 in koa unittest - * only node v6 is supported (stop supporting node v4 and v5) + * only node v6 or higher is supported (stop supporting node v4 and v5) + * switch to npm5 and use package-lock.json + * options added: includeStatusCode, formatStatusCode * **2.1.0** * deprecate **excludeRoutes**, use **req.originalUrl** instead of **req.path** * **2.0.0** diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..446b610 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1872 @@ +{ + "name": "express-prom-bundle", + "version": "3.0.0", + "lockfileVersion": 1, 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"sha1-pcbVMr5lbiPbgg77lDofBJmNY68=", + "dev": true + }, + "yargs": { + "version": "3.10.0", + "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz", + "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=", + "dev": true, + "optional": true + } + } +} diff --git a/spec/index.spec.js b/spec/index.spec.js index 21801d7..8aa7354 100644 --- a/spec/index.spec.js +++ b/spec/index.spec.js @@ -169,7 +169,7 @@ describe('index', () => { }); }); - it('normalizePath can be replaced', done => { + it('normalizePath can be replaced gloablly', done => { const app = express(); const original = bundle.normalizePath; bundle.normalizePath = () => 'dummy'; @@ -193,6 +193,70 @@ describe('index', () => { }); }); + it('normalizePath can be overridden', done => { + const app = express(); + const instance = bundle({ + includePath: true, + normalizePath: req => req.originalUrl + '-suffixed' + }); + app.use(instance); + app.use('/test', (req, res) => res.send('it worked')); + const agent = supertest(app); + agent + .get('/test') + .end(() => { + agent + .get('/metrics') + .end((err, res) => { + expect(res.status).toBe(200); + expect(res.text).toMatch(/"\/test-suffixed"/m); + done(); + }); + }); + }); + + it('formatStatusCode can be overridden', done => { + const app = express(); + const instance = bundle({ + formatStatusCode: () => 555 + }); + app.use(instance); + app.use('/test', (req, res) => res.send('it worked')); + const agent = supertest(app); + agent + .get('/test') + .end(() => { + agent + .get('/metrics') + .end((err, res) => { + expect(res.status).toBe(200); + expect(res.text).toMatch(/555/); + done(); + }); + }); + }); + + it('includeStatusCode=false removes status_code label from metrics', done => { + const app = express(); + const instance = bundle({ + includeStatusCode: false + }); + app.use(instance); + app.use('/test', (req, res) => res.send('it worked')); + const agent = supertest(app); + agent + .get('/test') + .end(() => { + agent + .get('/metrics') + .end((err, res) => { + expect(res.status).toBe(200); + expect(res.text).not.toMatch(/200/); + done(); + }); + }); + }); + it('Koa: metrics returns up=1', done => { const app = new Koa(); const bundled = bundle({ diff --git a/spec/normalizePath.spec.js b/spec/normalizePath.spec.js index be736fb..583cc31 100644 --- a/spec/normalizePath.spec.js +++ b/spec/normalizePath.spec.js @@ -4,25 +4,8 @@ const normalizePath = require('../src/normalizePath'); describe('normalizePath', () => { - it('returns original if disabled in opts', () => { - expect( - normalizePath({originalUrl: '/a/12345'}, {normalizePath: false}) - ).toBe('/a/12345'); - }); - - it('returns run callback if configured', () => { - expect( - normalizePath( - {originalUrl: '/a/12345'}, - { - normalizePath: req => req.originalUrl + '-ok' - } - ) - ).toBe('/a/12345-ok'); - }); - it('uses UrlValueParser by default', () => { - expect(normalizePath({originalUrl: '/a/12345'})) + expect(normalizePath({url: '/a/12345'})) .toBe('/a/#val'); }); }); diff --git a/spec/normalizeStatusCode.spec.js b/spec/normalizeStatusCode.spec.js index 1721fe8..d2720db 100644 --- a/spec/normalizeStatusCode.spec.js +++ b/spec/normalizeStatusCode.spec.js @@ -4,20 +4,9 @@ const normalizeStatusCode = require('../src/normalizeStatusCode'); describe('normalizeStatusCode', () => { - it('returns original if disabled in opts', () => { - expect( - normalizeStatusCode({status_code: 404}, {normalizeStatusCode: false}) - ).toBe(404); - }); - it('returns run callback if configured', () => { expect( - normalizeStatusCode( - {status_code: 500}, - { - formatStatusCode: res => String(res.status_code).slice(0, -2) + 'xx' - } - ) - ).toBe('5xx'); + normalizeStatusCode({status_code: 500}) + ).toBe(500); }); }); diff --git a/src/index.js b/src/index.js index 00cd828..9dd47c6 100644 --- a/src/index.js +++ b/src/index.js @@ -39,7 +39,15 @@ function prepareMetricNames(opts, metricTemplates) { } function main(opts) { - opts = Object.assign({autoregister: true}, opts); + opts = Object.assign( + { + autoregister: true, + includeStatusCode: true, + normalizePath: main.normalizePath, + formatStatusCode: main.normalizeStatusCode + }, + opts + ); if (arguments[2] && arguments[1] && arguments[1].send) { arguments[1].status(500) .send('

500 Error

\n' @@ -114,20 +122,17 @@ function main(opts) { } if (metrics[httpMtricName]) { - labels = {'status_code': 0}; + labels = {}; let timer = metrics[httpMtricName].startTimer(labels); onFinished(res, () => { - if (opts.normalizeStatusCode) { - labels.status_code = main.normalizeStatusCode(res, opts); - } else { - labels.status_code = res.statusCode; + if (opts.includeStatusCode) { + labels.status_code = opts.formatStatusCode(res, opts); } - if (opts.includeMethod) { labels.method = req.method; } if (opts.includePath) { - labels.path = main.normalizePath(req, opts); + labels.path = opts.normalizePath(req, opts); } timer(); }); diff --git a/src/normalizePath.js b/src/normalizePath.js index e8ea3cd..677cc8d 100644 --- a/src/normalizePath.js +++ b/src/normalizePath.js @@ -4,21 +4,12 @@ const UrlValueParser = require('url-value-parser'); const url = require('url'); let urlValueParser; -module.exports = function(req, opts) { - opts = opts || {}; - +module.exports = function(req) { // originalUrl is taken, because url and path can be changed // by middlewares such as 'router'. Note: this function is called onFinish /// i.e. always in the tail of the middleware chain const path = url.parse(req.originalUrl || req.url).pathname; - if (opts.normalizePath !== undefined && !opts.normalizePath) { - return path; - } - if (typeof opts.normalizePath === 'function') { - return opts.normalizePath(req, opts); - } - if (!urlValueParser) { urlValueParser = new UrlValueParser(); } diff --git a/src/normalizeStatusCode.js b/src/normalizeStatusCode.js index 6c56354..545bf2f 100644 --- a/src/normalizeStatusCode.js +++ b/src/normalizeStatusCode.js @@ -1,11 +1,5 @@ 'use strict'; -module.exports = function(res, opts) { - opts = opts || {}; - - if (typeof opts.formatStatusCode === 'function') { - return opts.formatStatusCode(res, opts); - } - - return res.status_code; +module.exports = function(res) { + return res.status_code || res.statusCode; };