Code files

Chapter10/service-discovery-with-dns/micro/adderservice/index.js

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

Chapter10/service-discovery-with-dns/micro/adderservice/package.json

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+{
+  "name": "adderservice",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "tap test"
+  },
+  "keywords": [],
+  "author": "Peter Elger",
+  "license": "ISC",
+  "dependencies": {
+    "restify": "^4.3.0"
+  },
+  "devDependencies": {
+    "tap": "^10.3.1"
+  }
+}

Chapter10/service-discovery-with-dns/micro/adderservice/service.js

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+'use strict'
+
+module.exports = service
+
+function service () {
+  function add (args, cb) {
+    const {first, second} = args
+    const result = (parseInt(first, 10) + parseInt(second, 10))
+    cb(null, {result: result.toString()})
+  }
+
+  return { add }
+}

Chapter10/service-discovery-with-dns/micro/adderservice/test/index.js

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+'use strict'
+
+const {test} = require('tap')
+const service = require('../service')()
+
+test('test add', (t) => {
+  t.plan(2)
+
+  service.add({first: 1, second: 2}, (err, answer) => {
+    t.error(err)
+    t.same(answer, {result: 3})
+  })
+})

Chapter10/service-discovery-with-dns/micro/adderservice/wiring.js

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+'use strict'
+
+const restify = require('restify')
+const { ADDERSERVICE_SERVICE_PORT } = process.env
+
+module.exports = wiring 
+
+function wiring (service) {
+  const server = restify.createServer()
+
+  server.get('/add/:first/:second', (req, res, next) => {
+    service.add(req.params, (err, result) => {
+      if (err) { 
+        res.send(err)
+        next()
+        return 
+      }
+      res.send(200, result)
+      next()
+    })
+  })
+
+  server.listen(ADDERSERVICE_SERVICE_PORT, '0.0.0.0', () => {
+    console.log('%s listening at %s', server.name, server.url)
+  })
+}
+