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fake-device-manager.js

@@ -1,96 +1,73 @@
-const sizeof = require('object-sizeof')
-const FakeDevice = require('./fake-device')
+/* globals describe it */
 
-module.exports = function FakeDeviceManager ({
-  connection,
-  deviceCount = 10,
-  spawnInterval = 200,
-  metricsInterval = 200,
-  sendInterval = 15000,
-  measurements,
-  onUpdateStats
-}) {
-  if (!connection) {
-    throw new Error('Missing connection param')
-  }
-  if (!measurements) {
-    throw new Error('Missing measurements param')
-  }
-  let devices = []
+const expect = require('chai').expect
 
-  let stats = {
-    devices: 0,
-    measurements: 0,
-    writes: 0,
-    size: 0,
-    errors: 0
-  }
+const FakeDeviceManager = require('../src/fake-device-manager')
+const measurements = {
+  usage: {type: 'integer', min: 0, max: 100},
+  voltage: {type: 'integer', min: 0, max: 15},
+  temperature: {type: 'integer', min: -20, max: 60}
+}
 
-  /**
-   * Return device list
-   */
-  const getDevices = () => {
-    return devices
+//  create fake influx connection
+//  let connectionWriteData = false
+const connection = {
+  send: (deviceId, data) => {
+    return new Promise((resolve, reject) => {
+      //  connectionWriteData = {deviceId, data}
+      resolve()
+    })
   }
+}
 
-  /**
-   * Return stats data
-   */
-  const getStats = () => {
-    return stats
-  }
+describe('FakeDeviceManager', function () {
+  let fakeDeviceManager = null
 
-  /**
-   * Update stats on device data send event
-   */
-  const onDeviceSendData = (err, data) => {
-    if (err) {
-      console.log(err)
-      stats.errors++
-      return
-    }
-    stats.measurements += data.length
-    data.forEach(chunk => {
-      stats.size += sizeof(chunk)
-    })
-    stats.writes++
-  }
+  it('should throw error if no params are passed', function () {
+    expect(FakeDeviceManager).to.throw(Error)
+  })
 
-  /**
-   * Start device spawn process
-   */
-  const start = () => {
-    let __spawnInterval = setInterval(() => {
-      stats.devices++
-      devices.push(FakeDevice({
-        deviceId: stats.devices,
-        connection,
-        measurements,
-        onSendData: onDeviceSendData,
-        autoStart: true,
-        metricsInterval,
-        sendInterval
-      }))
-      //  when device limit is reached stop spawn inteval
-      if (stats.devices === deviceCount) {
-        clearTimeout(__spawnInterval)
-      }
-    }, spawnInterval)
-  }
+  it('shold throw missing connection param', function () {
+    expect(() => FakeDeviceManager({})).to.throw('Missing connection param')
+  })
 
-  /**
-   * Stop all spawned devices
-   */
-  const stop = () => {
-    for (let i = 0; i < stats.devices; i++) {
-      devices[i].stop()
-    }
-  }
+  it('shold throw missing measurements param', function () {
+    expect(() => FakeDeviceManager({
+      connection
+    })).to.throw('Missing measurements param')
+  })
 
-  return {
-    start,
-    stop,
-    getDevices,
-    getStats
-  }
-}
+  it('should create instance', function () {
+    fakeDeviceManager = FakeDeviceManager({
+      connection,
+      measurements,
+      sendInterval: 500
+    })
+    expect(fakeDeviceManager).to.have.property('start')
+  })
+
+  it('should spawn device instances', function (done) {
+    fakeDeviceManager.start()
+    setTimeout(() => {
+      let devices = fakeDeviceManager.getDevices()
+      done(!devices.length)
+    }, 500)
+  })
+
+  it('should collect device stats', function (done) {
+    setTimeout(() => {
+      let stats = fakeDeviceManager.getStats()
+      if (!stats) return done('No data')
+      if (
+        stats.devices &&
+        stats.measurements &&
+        stats.writes &&
+        stats.size
+      ) {
+        done()
+      } else {
+        done('Invalid write data format')
+      }
+    }, 1000)
+  })
+})

fake-device.js

@@ -1,111 +1,81 @@
-/**
- * Create FakeDevice
- *
- * @param {any} {
- *   deviceId,
- *   metricsInterval = 100,
- *   sendInterval = 15000
- * }
- * @returns FakeDevice
- */
-module.exports = function FakeDevice ({
-  deviceId,
-  connection,
-  metricsInterval = 100,
-  sendInterval = 30000,
-  onSendData,
-  autoStart = false,
-  measurements
-}) {
-  if (!deviceId) {
-    throw new Error('Missing deviceId param')
-  }
-  if (!connection) {
-    throw new Error('Missing connection param')
-  }
-  if (!measurements) {
-    throw new Error('Missing measurements param')
-  }
+/* globals describe it */
 
-  let data = []
+const expect = require('chai').expect
 
-  let __metricsInterval = null
-  let __sendInterval = null
+const FakeDevice = require('../src/fake-device')
+const measurements = {
+  usage: {type: 'integer', min: 0, max: 100},
+  voltage: {type: 'integer', min: 0, max: 15},
+  temperature: {type: 'integer', min: -20, max: 60}
+}
 
-  /**
-   * Return data buffer
-   */
-  const getData = () => {
-    return data
+//  create fake influx connection
+let connectionWriteData = false
+const connection = {
+  send: (deviceId, data) => {
+    return new Promise((resolve, reject) => {
+      connectionWriteData = {deviceId, data}
+      resolve()
+    })
   }
+}
 
-  /**
-   * Read data from sensors
-   * Will generate fake random data
-   */
-  const readData = () => {
-    function getRandomArbitrary (min, max) {
-      return Math.random() * (max - min) + min
-    }
+describe('FakeDevice', function () {
+  let fakeDevice = null
 
-    let chunk = {}
-    Object.keys(measurements).forEach(measurement => {
-      switch (measurements[measurement].type) {
-        case 'integer':
-          chunk[measurement] = getRandomArbitrary(measurements[measurement].min, measurements[measurement].max)
-          break
-        default:
-          throw new Error('Invalid measurement type')
-      }
-    })
-    chunk['timestamp'] = new Date()
+  it('should throw error if no params are passed', function () {
+    expect(FakeDevice).to.throw(Error)
+  })
 
-    data.push(chunk)
-  }
+  it('shold throw missing deviceId param', function () {
+    expect(() => FakeDevice({})).to.throw('Missing deviceId param')
+  })
 
-  /**
-   * Send data to db and clear data buffer
-   * Calls onSendData function if set
-   */
-  const send = () => {
-    //  send data buffer to connection
-    connection.send(deviceId, data)
-    .then(() => {
-      if (!onSendData) return
-      onSendData(null, data)
-      //  clear internal data buffer on successfull send
-      data = []
-    })
-    .catch(err => {
-      if (!onSendData) return
-      onSendData(err)
-    })
-  }
+  it('shold throw missing connection param', function () {
+    expect(() => FakeDevice({
+      deviceId: 1
+    })).to.throw('Missing connection param')
+  })
 
-  /**
-   * Stop collecting data
-   */
-  const stop = () => {
-    clearInterval(__metricsInterval)
-    clearInterval(__sendInterval)
-  }
+  it('shold throw missing measurements param', function () {
+    expect(() => FakeDevice({
+      deviceId: 1,
+      connection
+    })).to.throw('Missing measurements param')
+  })
 
-  /**
-   * Start collecting data
-   */
-  const start = () => {
-    __metricsInterval = setInterval(readData, metricsInterval)
-    __sendInterval = setInterval(send, sendInterval)
-  }
+  it('should create instance', function () {
+    fakeDevice = FakeDevice({
+      deviceId: 1,
+      connection,
+      sendInterval: 1000,
+      measurements
+    })
+    expect(fakeDevice).to.have.property('start')
+  })
 
-  if (autoStart) {
-    start()
-  }
+  it('should generate data', function (done) {
+    fakeDevice.start()
+    setTimeout(() => {
+      let data = fakeDevice.getData()
+      done(!data.length)
+    }, 500)
+  })
 
-  return {
-    stop,
-    start,
-    send,
-    getData
-  }
-}
+  it('should send data to influx', function (done) {
+    setTimeout(() => {
+      if (!connectionWriteData) return done('No data')
+      if (!connectionWriteData.deviceId) return done('Invalid write data - missing deviceId')
+      if (
+        connectionWriteData.data[0].usage &&
+        connectionWriteData.data[0].voltage &&
+        connectionWriteData.data[0].temperature &&
+        connectionWriteData.data[0].timestamp
+      ) {
+        done()
+      } else {
+        done('Invalid write data format')
+      }
+    }, 1000)
+  })
+})

index.js

@@ -0,0 +1,23 @@
+const DeviceManager = require('./src/fake-device-manager')
+const FakeDeviceConnection = require('./src/fake-device-connection')()
+
+const updateStats = require('./src/stats')
+
+console.log('Generating data - send interval: 30s')
+
+let deviceManager = DeviceManager({
+  deviceCount: 10,
+  metricsInterval: 30,
+  connection: FakeDeviceConnection,
+  onUpdateStats: updateStats,
+  measurements: {
+    temperature: {type: 'integer', min: -10, max: 50},
+    air_humidity: {type: 'integer', min: 30, max: 100},
+    ground_humidity: {type: 'integer', min: 30, max: 100},
+    airforce: {type: 'integer', min: 30, max: 100}
+  }
+})
+
+updateStats(deviceManager)
+
+deviceManager.start()

package.json

@@ -0,0 +1,30 @@
+{
+  "name": "iot-dummy-data-generator",
+  "version": "0.1.0",
+  "description": "Spawn dummy IoT devices and generate custom data that can be send to some data store.",
+  "main": "index.js",
+  "scripts": {
+    "test": "mocha --watch --reporter spec"
+  },
+  "author": "Vedran Jukic",
+  "license": "MIT",
+  "dependencies": {
+    "influx": "^5.0.3",
+    "object-sizeof": "^1.1.1",
+    "progress": "^1.1.8"
+  },
+  "devDependencies": {
+    "eslint": "^3.11.1",
+    "eslint-config-standard": "^6.2.1",
+    "eslint-plugin-promise": "^3.4.0",
+    "eslint-plugin-standard": "^2.0.1",
+    "chai": "^3.5.0",
+    "deepstream.io": "^2.0.0",
+    "deepstream.io-client-js": "^2.0.0",
+    "diff": "^3.0.1",
+    "jsdoc": "^3.4.3",
+    "mocha": "^3.1.2",
+    "sinon": "^1.17.6",
+    "winston": "^2.3.0"
+  }
+}