cf-service-metrics-logger

Cloud Foundry Service Metrics Logger

❯ Table of Contents

• Quick Start
• Development
• Project Structure

❯ Quick Start

Installation

Install library by using npm

npm install cf-service-metrics-logger

or by using yarn

yarn add cf-service-metrics-logger

How to use

Create a new instance of CfServiceMetricsLogger and pass any kind of logger implementing following interface:

• debug(message: {} | [] | string | number)
• info(message: {} | [] | string | number)
• warn(message: {} | [] | string | number)
• error(message: {} | [] | string | number)

/* import library by using CommonJS module loader */
const CfServiceMetricsLogger = require('cf-service-metrics-logger');

/* or import library by using ES6 module loader */
import { CfServiceMetricsLogger } from 'cf-service-metrics-logger';

/* create logger instance or use a logger library */
class Logger {
  debug(message) {
    console.debug(message);
  }

  info(message) {
    console.info(message);
  }

  warn(message) {
    console.warn(message);
  }

  error(message) {
    console.error(message);
  }
}

const logger = new Logger();

/* you can add some options to CfServiceMetricsLogger */
const options = {
  mongoDB: {
    serverStatusInterval: 10000, //optional
    bStatsInterval: 20000, //optional
  },
  redis: {
    infoInterval: 100000 //optional
  },
  vcap: {}; //optional
  vcapFile: ''; //optional
};

/* create new instance of CfServiceMetricsLogger and pass logger instance and optional options */
const cfServiceMetricsLogger = new CfServiceMetricsLogger(logger, options);

/* start service metrics logging */
cfServiceMetricsLogger.start();

/* stop service metrics logging */
cfServiceMetricsLogger.stop();

❯ Development

Getting Started

Step 1: Set up the Development Environment

You need to set up your development environment before you can do anything.

Install Node.js and NPM

• on OSX use homebrew brew install node
• on Windows use chocolatey choco install nodejs

Install yarn globally

yarn install yarn -g

Step 2: Set up Environment Variables

Copy the vcap.example.json file and rename it to vcap.json. This file provides VCAP_SERVICES and/or VCAP_APPLICATION for local development. More information is provided here.

Step 3: Install dependencies

Install all dependencies with yarn.

yarn install

Scripts and Tasks

Install

• Install all dependencies with yarn install

Linting

• Run code quality analysis using yarn run lint. This runs tslint.

Tests

• Run unit test using yarn run test.

Building the project

• Run yarn run build to generate commonJS and ES6 modules as well as declaration from the TypeScript source.
• Builded sources are located in dist folder.

Debugger

VS Code

Just set a breakpoint in source or unit test and hit F5 in your Visual Studio Code to execute and debug all unit tests.

❯ Project Structure

Name	Description
.vscode/	VSCode tasks, launch configuration and some other settings
dist/	Compiled and bundled source files will be placed here
src/	Source files
src/types/ *.d.ts	Custom type definitions and files that aren't on DefinitelyTyped
test/	Tests
test/unit/ *.test.ts	Unit tests
vcap.example.json	Provides VCAP_SERVICES and/or VCAP_APPLICATION for local development
vcap.test.json	Provides VCAP_SERVICES and/or VCAP_APPLICATION for unit tests
rollup.config.js	Config for Rollup module bundler