Code files

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

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

Chapter11/deploying-to-the-cloud/micro/report/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/report/env.js

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+'use strict'
+
+// provides environment variable setup for concordant
+
+const env = {
+  DNS_NAMESPACE: 'micro',
+  DNS_SUFFIX: 'svc.cluster.local'
+}
+
+if (process.env.NODE_ENV !== 'production') {
+  Object.assign(env, {  
+    DNS_HOST: '127.0.0.1',
+    DNS_PORT: '53053'
+  })
+}
+
+Object.assign(process.env, env)

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

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+'use strict'
+require('./env')
+const { dns } = require('concordant')()
+const redis = require('redis')
+const CliTable = require('cli-table')
+const QNAME = 'eventservice'
+const RESPONSE_QUEUE = 'summary'
+const ENDPOINT = '_main._tcp.redis.micro.svc.cluster.local'
+
+dns.resolve(ENDPOINT, report)
+
+function report (err, locs) {
+  if (err) { return console.log(err) }
+  const { port, host } = locs[0]
+  const client = redis.createClient(port, host)
+  const event =  JSON.stringify({
+    action: 'summary',
+    returnPath: RESPONSE_QUEUE
+  })
+
+  client.lpush(QNAME, event, (err) => {
+    if (err) { 
+      console.error(err)
+      return  
+    }
+
+    client.brpop(RESPONSE_QUEUE, 5, (err, data) => {
+      if (err) { 
+        console.error(err)
+        return  
+      }
+      const summary = JSON.parse(data[1])
+      const cols = Object.keys(summary).map((url) => [url, summary[url]])
+      const table = new CliTable({
+        head: ['url', 'count'],
+        colWidths: [50, 10]
+      })
+      table.push(...cols)
+      console.log(table.toString())
+      client.quit()
+    })
+  })
+}

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

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+{
+  "name": "report",
+  "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": {
+    "cli-table": "^0.3.1",
+    "concordant": "^0.2.1",
+    "redis": "^2.6.5"
+  }
+}