diff --git a/README.md b/README.md
index 49bc0006cf41a6cbf862e91079bf12053bdcac8e..1e1d053770f107262d84eb01aeaee6ca77eee1a0 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ A small express middleware to get base metrics for any node.js app.
## Usage
-`import { Metrics } from '@plastdev/metrics'`
+`import { Metrics, MetricType } from '@plastdev/metrics'`
`let metrics = new Metrics(options)`
Note: The options Part may be omitted, as all parts are optional.
@@ -20,16 +20,93 @@ Before your Routes:
And to enable the *_metrics*-Endpoint:
`router.get('/_metrics', metrics.endpoint)`
+### Custom Metrics
+
To Add your own custom Metrics:
`metrics.addCustomMetric({
name: 'test',
- help: 'Some Test Metric',
- labelNames: ['tester']
- })`
+ help: 'Some Test Metric'
+ }, TYPE)`
+
+where TYPE is one of:
+
+- `MetricType.COUNTER`
+- `MetricType.GAUGE`
+- `MetricType.HISTOGRAM`
+- `MetricType.SUMMARY`
+
+All metrics can take a labelNames property in the configuration object. All labelNames that the metric support needs to be declared here. There are 2 ways to add values to the labels
+
+```js
+metrics.addCustomMetric({
+ name: 'metric_name',
+ help: 'metric_help',
+ labelNames: ['method', 'statusCode'],
+}, MetricType.GAUGE);
+
+metrics.customMetrics["NAME"].set({ method: 'GET', statusCode: '200' }, 100); // 1st version, Set value 100 with method set to GET and statusCode to 200
+metrics.customMetrics["NAME"].labels('GET', '200').set(100); // 2nd version, Same as above
+```
+
+It is also possible to use timers with labels, both before and after the timer is created:
+
+```js
+const end = metrics.customMetrics["NAME"].startTimer({ method: 'GET' }); // Set method to GET, we don't know statusCode yet
+xhrRequest(function (err, res) {
+ if (err) {
+ end({ statusCode: '500' }); // Sets value to xhrRequest duration in seconds with statusCode 500
+ } else {
+ end({ statusCode: '200' }); // Sets value to xhrRequest duration in seconds with statusCode 200
+ }
+});
+```
+
+#### Counter
+
+Counters go up, and reset when the process restarts.
+
+- `metrics.customMetrics["NAME"].inc(); // Inc with 1`
+- `metrics.customMetrics["NAME"].inc(10); // Inc with 10`
+
+#### Gauge
+
+Gauges are similar to Counters but Gauges value can be decreased.
+
+- `metrics.customMetrics["NAME"].set(10); // Set to 10`
+- `metrics.customMetrics["NAME"].inc(); // Inc with 1`
+- `metrics.customMetrics["NAME"].inc(10); // Inc with 10`
+- `metrics.customMetrics["NAME"].dec(); // Dec with 1`
+- `metrics.customMetrics["NAME"].dec(10); // Dec with 10`
+
+#### Histograms
+
+Histograms track sizes and frequency of events.
+
+`metrics.customMetrics["NAME"].observe(10); // Observe value in histogram`
+
+Utility to observe request durations
+
+```js
+const end = metrics.customMetrics["NAME"].startTimer();
+xhrRequest(function (err, res) {
+ const seconds = end(); // Observes and returns the value to xhrRequests duration in seconds
+});
+```
+
+#### Summary
+
+Summaries calculate percentiles of observed values.
+
+`metrics.customMetrics["NAME"].observe(10);`
+
+Utility to observe request durations
-then you may increase or decrease the value at any given point:
-`this.metrics.incCustomMetric('test', 'tester', 'called_bar')`
-`this.metrics.decCustomMetric('test', 'tester', 'called_bar')`
+```js
+const end = metrics.customMetrics["NAME"].startTimer();
+xhrRequest(function (err, res) {
+ end(); // Observes the value to xhrRequests duration in seconds
+});
+```
### Options
diff --git a/docs/test-report.html b/docs/test-report.html
index e5a95381e9ef9597f55483e0f77a1da978738d0d..fdc172ac89d2da22ec9caa1fa5a47437094f333a 100644
--- a/docs/test-report.html
+++ b/docs/test-report.html
@@ -16,7 +16,7 @@
<div id="app">
</div>
<script>
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/*!
diff --git a/examples/src/app.ts b/examples/src/app.ts
index 9c4760f57d7a815a6c128ade1dac73edca036ee5..de34e23ebce4bfd31c96ca3e91f7fe22f4e1474e 100644
--- a/examples/src/app.ts
+++ b/examples/src/app.ts
@@ -3,7 +3,7 @@
import * as http from 'http'
import * as express from 'express'
-import { Metrics } from '../../dist/index'
+import { Metrics, MetricType } from '../../dist/index'
class App {
public app: express.Application
@@ -27,9 +27,8 @@ class App {
this.metrics.addCustomMetric({
name: 'test',
- help: 'Some Test Metric',
- labelNames: ['tester']
- })
+ help: 'Some Test Metric'
+ }, MetricType.COUNTER)
this.router.use(this.metrics.collect)
@@ -39,7 +38,7 @@ class App {
res.status(200).send('foo')
})
this.router.get('/bar', (req:express.Request, res:express.Response) => {
- this.metrics.incCustomMetric('test', 'tester', 'called_bar')
+ this.metrics["test"].inc()
res.status(200).send('bar')
})
this.router.get('/404', (req:express.Request, res:express.Response) => {
diff --git a/src/index.ts b/src/index.ts
index 5d4716eea68f693a0ad7f9e05db0523cf5742129..b6e90c7292e9de9397b6516b9909581b6f01ef76 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -11,7 +11,14 @@ export interface Options {
export interface CustomMetric {
name: string
help: string
- labelNames: string[]
+ labelNames?: string[]
+}
+
+export enum MetricType {
+ GAUGE,
+ COUNTER,
+ HISTOGRAM,
+ SUMMARY
}
export class Metrics {
@@ -27,11 +34,11 @@ export class Metrics {
public readonly _numOfRequests: any
public readonly _numOfErrors: any
- public readonly _customMetrics: any
+ public readonly customMetrics: any
constructor (options: Partial<Options> = {}) {
this._client = require('prom-client')
- this._customMetrics = {}
+ this.customMetrics = {}
if (typeof options.ignore !== 'undefined') {
this._ignore = options.ignore
@@ -87,24 +94,23 @@ export class Metrics {
}
}
- public addCustomMetric = (options: CustomMetric): void => {
- this._customMetrics[options.name] = new this._client.Gauge({
- name: options.name,
- help: options.help,
- labelNames: options.labelNames
- })
- }
-
- public incCustomMetric = (name: string, label: string, value: string): void => {
- const inc: any = {}
- inc[label] = value
- this._customMetrics[name].inc(inc)
- }
-
- public decCustomMetric = (name: string, label: string, value: string): void => {
- const dec: any = {}
- dec[label] = value
- this._customMetrics[name].dec(dec)
+ public addCustomMetric = (options: CustomMetric, type: MetricType): void => {
+ switch (type) {
+ case MetricType.COUNTER:
+ this.customMetrics[options.name] = new this._client.Counter(options)
+ break
+ case MetricType.GAUGE:
+ this.customMetrics[options.name] = new this._client.Gauge(options)
+ break
+ case MetricType.HISTOGRAM:
+ this.customMetrics[options.name] = new this._client.Histogram(options)
+ break
+ case MetricType.SUMMARY:
+ this.customMetrics[options.name] = new this._client.Summary(options)
+ break
+ default:
+ break
+ }
}
public collect = (req: express.Request, res: express.Response, next: express.NextFunction): void => {