Code files

Chapter11/deploying-to-the-cloud/micro/eventservice/.dockerignore

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+.git
+.gitignore
+node_modules
+npm-debug.log

Chapter11/deploying-to-the-cloud/micro/eventservice/Dockerfile

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+FROM node:slim
+RUN mkdir -p /home/node/service
+WORKDIR /home/node/service
+COPY package.json /home/node/service
+RUN npm install
+COPY . /home/node/service
+CMD [ "node", "index.js" ]

Chapter11/deploying-to-the-cloud/micro/eventservice/Jenkinsfile

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+pipeline {
+  agent any 
+
+  stages {
+    stage('Checkout') {
+      steps { 
+        checkout scm
+      }
+    }
+    stage('Build') { 
+      steps { 
+        sh 'source ~/.bashrc && cd eventservice && npm install'
+      }
+    }
+    stage('Test'){
+      steps {
+        sh 'source ~/.bashrc && cd eventservice && npm test'
+      }
+    }
+    stage('Container'){
+      steps {
+        sh 'source ~/.bashrc && cd eventservice && sh build.sh container'
+      }
+    }
+    stage('Deploy'){
+      steps {
+        sh 'source ~/.bashrc && cd eventservice && sh build.sh deploy'
+      }
+    }
+  }
+}
+

Chapter11/deploying-to-the-cloud/micro/eventservice/build.sh

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+#!/bin/bash
+source ~/.bashrc
+
+GITSHA=$(git rev-parse --short HEAD)
+
+case "$1" in
+  container)
+    sudo -u pelger docker build -t eventservice:$GITSHA .
+    sudo -u pelger docker tag eventservice:$GITSHA pelger/eventservice:$GITSHA 
+    sudo -i -u pelger docker push pelger/eventservice:$GITSHA 
+  ;;
+  deploy)
+    sed -e s/_NAME_/eventservice/ -e s/_PORT_/8082/  < ../deployment/service-template.yml > svc.yml
+    sed -e s/_NAME_/eventservice/ -e s/_PORT_/8082/ -e s/_IMAGE_/pelger\\/eventservice:$GITSHA/ < ../deployment/deployment-template.yml > dep.yml
+    sudo -i -u pelger kubectl apply -f $(pwd)/svc.yml
+    sudo -i -u pelger kubectl apply -f $(pwd)/dep.yml
+  ;;
+  *)
+    echo 'invalid build command'
+    exit 1
+  ;;
+esac
+

Chapter11/deploying-to-the-cloud/micro/eventservice/index.js

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+'use strict'
+
+const wiring = require('./wiring')
+const service = require('./service')()
+wiring(service)

Chapter11/deploying-to-the-cloud/micro/eventservice/package.json

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+{
+  "name": "event-service",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"no test specified\" && exit 0"
+  },
+  "keywords": [],
+  "author": "Peter Elger <peter.elger@nearform.com>",
+  "license": "ISC",
+  "dependencies": {
+    "concordant": "^0.2.1",
+    "mongodb": "^2.2.25",
+    "redis": "^2.6.5"
+  }
+}

Chapter11/deploying-to-the-cloud/micro/eventservice/service.js

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+'use strict'
+
+const { MongoClient } = require('mongodb')
+const { dns } = require('concordant')()
+
+module.exports = service 
+
+function service () {
+  var db
+
+  setup()
+
+  function setup () {
+    const mongo = '_main._tcp.mongo.micro.svc.cluster.local'
+
+    dns.resolve(mongo, (err, locs) => {
+      if (err) { 
+        console.error(err)
+        return
+      }
+      const { host, port } = locs[0]
+      const url = `mongodb://${host}:${port}/events`
+      MongoClient.connect(url, (err, client) => {
+        if (err) { 
+          console.log('failed to connect to MongoDB retrying in 100ms')
+          setTimeout(setup, 100)
+          return
+        }
+        db = client
+        db.on('close', () => db = null)
+      }) 
+    })
+  }
+
+  function record (args, cb) {
+    if (!db) {
+      cb(Error('No database connection'))
+      return
+    }
+    const events = db.collection('events')
+    const data = { 
+      ts: Date.now(),
+      eventType: args.type,
+      url: args.url 
+    }
+    events.insert(data, (err, result) => {
+      if (err) {
+        cb(err)
+        return
+      }
+      cb(null, result)
+    })
+  }
+
+  function summary (args, cb) {
+    if (!db) {
+      cb(Error('No database connection'))
+      return
+    }
+    const summary = {}
+    const events = db.collection('events')
+    events.find({}).toArray( (err, docs) => {
+      if (err) return cb(err)
+
+      docs.forEach(function (doc) {
+        if (!(summary[doc.url])) {
+          summary[doc.url] = 1
+        } else {
+          summary[doc.url]++
+        }
+      })
+      cb(null, summary)
+    })
+  }
+
+  return {
+    record: record,
+    summary: summary
+  }
+}

Chapter11/deploying-to-the-cloud/micro/eventservice/wiring.js

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+'use strict'
+
+const { dns } = require('concordant')()
+const redis = require('redis')
+const QNAME = 'eventservice'
+
+module.exports = wiring 
+
+function wiring (service) {
+  
+  const endpoint = '_main._tcp.redis.micro.svc.cluster.local'
+
+  dns.resolve(endpoint, (err, locs) => {
+    if (err) { 
+      console.log(err)
+      return 
+    }
+    const { port, host } = locs[0]
+    pullFromQueue(redis.createClient(port, host))
+  })
+
+  function pullFromQueue (client) {
+    client.brpop(QNAME, 5, function (err, data) {
+      if (err) console.error(err)
+      if (err || !data) {
+        pullFromQueue(client)
+        return
+      }
+      const msg = JSON.parse(data[1])
+      const { action, returnPath } = msg
+      const cmd = service[action]
+      if (typeof cmd !== 'function') {
+        pullFromQueue(client)
+        return
+      }
+      cmd(msg, (err, result) => {
+        if (err) { 
+          console.error(err)
+          pullFromQueue(client)
+          return 
+        }
+        if (!returnPath) {
+          pullFromQueue(client)
+          return
+        }
+        client.lpush(returnPath, JSON.stringify(result), (err) => {
+          if (err) console.error(err)
+          pullFromQueue(client)
+        })
+      })
+    })
+  }
+}