Code files

Chapter10/standardizing-service-boilerplate/micro-pattern-routing/adderservice/index.js

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

Chapter10/standardizing-service-boilerplate/micro-pattern-routing/adderservice/package.json

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+{
+  "name": "adderservice",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Peter Elger",
+  "license": "ISC",
+  "dependencies": {
+    "bloomrun": "^3.0.4",
+    "net-object-stream": "^2.0.0",
+    "pump": "^1.0.2",
+    "through2": "^2.0.3"
+  },
+  "devDependencies": {
+    "tap": "^10.3.1"
+  }
+}

Chapter10/standardizing-service-boilerplate/micro-pattern-routing/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/standardizing-service-boilerplate/micro-pattern-routing/adderservice/test/test.js

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+var test = require('tap').test
+var service = require('../service')()
+
+test('test add', function (t) {
+  t.plan(2)
+
+  service.add({first: 1, second: 2}, function (err, result) {
+    t.equal(err, null)
+    t.equal(result, 3)
+  })
+})
+

Chapter10/standardizing-service-boilerplate/micro-pattern-routing/adderservice/wiring.js

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+'use strict'
+
+const net = require('net')
+const nos = require('net-object-stream')
+const through = require('through2')
+const pump = require('pump')
+const bloomrun = require('bloomrun')
+
+const { ADDERSERVICE_SERVICE_PORT } = process.env
+
+module.exports = wiring 
+
+function wiring (service) {
+  const patterns = createPatternRoutes(service)
+  const matcher = createMatcherStream(patterns)
+
+  const server = net.createServer((socket) => {
+    socket = nos(socket)
+    pump(socket, matcher, socket, failure)
+  })
+
+  server.listen(ADDERSERVICE_SERVICE_PORT, '0.0.0.0', () => {
+    console.log('server listening at', ADDERSERVICE_SERVICE_PORT)
+  })
+}
+
+function createPatternRoutes (service) {
+  const patterns = bloomrun()
+
+  patterns.add({role: 'adder', cmd: 'add'}, service.add)
+
+  return patterns
+}
+
+function createMatcherStream (patterns) {
+  return through.obj((object, enc, cb) => {
+    const match = patterns.lookup(object)
+    if (match === null) {
+      cb()
+      return
+    }
+    match(object, (err, data) => {
+      if (err) {
+        cb(null, {status: 'error', err: err})
+        return
+      }
+      cb(null, data)
+    })
+  })
+}
+
+function failure (err) {
+  if (err) console.error('Server error', err)
+  else console.error('Stream pipeline ended')
+}