Onboarding Node.js enabler for Zowe API Mediation Layer

This is the onboarding Node.js enabler for Zowe API Mediation Layer (part of Zowe) that allows to register a NodeJS based service to the API Mediation Layer Discovery Service. It uses eureka-js-client.

How to use

1. Install the onboarding Node.js enabler package as a dependency of your service:

   npm i @zowe/apiml-onboarding-enabler-nodejs --dev-save

2. Inside your Node.js service index.js, add the following code block to register your service with Eureka:

   const apiLayerService = require("@zowe/apiml-onboarding-enabler-nodejs");
   tlsOptions = apiLayerService.tlsOptions;
   const httpsServer = https.createServer(tlsOptions, app);
   httpsServer.listen(args.port, function () {
       apiLayerService.connectToEureka();
   });
      

   To make sure that your application will automatically unregister from Eureka once shut down, you can use the unregisterFromEureka() function, like shown in the example below. Example:

   process.on('SIGINT', signal => {
       apiLayerService.unregisterFromEureka();
       httpsServer.close(() => {
           process.exit(0);
       });
   });   
          

3. Create a yaml file named service-configuration.yml, add the configuration properties and place the yaml file inside a /config directory at the same level of your index.js. Below is an example of the configuration.

   Example:

   serviceId: hwexpress
   title: Hello World express REST API
   eureka:
     ssl: true
     host: localhost
     ipAddress: 127.0.0.1
     port: 10011
     servicePath: '/eureka/apps/'
     maxRetries: 30
     requestRetryDelay: 1000
     registryFetchInterval: 5
      
      
   description: Hello World REST API Service implemented in Express and Node.js
   baseUrl: https://localhost:10020/hwexpress
   homePageRelativeUrl: https://localhost:10020/
   statusPageRelativeUrl: https://localhost:10020/info
   healthCheckRelativeUrl: https://localhost:10020/status
   discoveryServiceUrls:
     - https://localhost:10011/eureka
   routes:
     - gatewayUrl: /api/v1
       serviceRelativeUrl: /api/v1
   apiInfo:
     - apiId: org.zowe.hwexpress
       gatewayUrl: "api/v1"
       swaggerUrl: https://localhost:10020/swagger.json
   catalogUiTile:
     id: cademoapps
     title: Sample API Mediation Layer Applications
     description: Applications which demonstrate how to make a service integrated to the API Mediation Layer ecosystem
     version: 1.0.0
   instance:
     app: hwexpress
     vipAddress: hwexpress
     instanceId: localhost:hwexpress:10020
     homePageUrl: https://localhost:10020/
     hostName: 'localhost'
     ipAddr: '127.0.0.1'
     secureVipAddress: hwexpress
     port:
       $: 10020
       '@enabled': false
     securePort:
       $: 10020
       '@enabled': "true"
      
     dataCenterInfo:
       '@class': com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo
       name: MyOwn
     metadata:
       apiml.catalog.tile.id: 'samplenodeservice'
       apiml.catalog.tile.title: 'Zowe Sample Node Service'
       apiml.catalog.tile.description: 'NodeJS Sample service running'
       apiml.catalog.tile.version: '1.0.0'
       apiml.routes.api_v1.gatewayUrl: "api/v1"
       apiml.routes.api_v1.serviceUrl: "/api/v1"
       apiml.apiInfo.0.apiId: org.zowe.hwexpress
       apiml.apiInfo.0.gatewayUrl: "api/v1"
       apiml.apiInfo.0.swaggerUrl: https://localhost:10020/swagger.json
       apiml.service.title: 'Zowe Sample Node Service'
       apiml.service.description: 'The Proxy Server is an HTTP HTTPS, and Websocket server built upon NodeJS and ExpressJS.'
      
   ssl:
     certificate: ssl/localhost.keystore.cer
     keystore: ssl/localhost.keystore.key
     caFile: ssl/localhost.pem
     keyPassword: password
      

4. Start your Node.js service and verify that it registers to the Zowe API Mediation Layer.