Code files

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)
+        })
+      })
+    })
+  }
+}