Code files

Chapter11/deploying-a-full-system/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()
+    })
+  })
+}