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fake-device-connection.js

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+const influx = require('./influx')()
+
+module.exports = function () {
+  /**
+   * Generates writepoints for influx bluk write operation
+   */
+  const getWritePoints = (deviceId, data) => {
+    let writePoints = []
+    //  itterate all data chunks
+    data.forEach(chunk => {
+      //  and for each data chunk key, create measurement and push it into writePoint (bulk-write)
+      Object
+      .keys(chunk)
+      .filter(measurement => measurement !== 'timestamp')
+      .forEach(measurement => {
+        writePoints.push({
+          measurement,
+          tags: {
+            deviceId
+          },
+          fields: {
+            value: chunk[measurement]
+          },
+          timestamp: chunk['timestamp']
+        })
+      })
+    })
+    return writePoints
+  }
+
+  const send = function (deviceId, data) {
+    return influx.writePoints(getWritePoints(deviceId, data))
+  }
+  return {
+    send
+  }
+}

fake-device-manager.js

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+const sizeof = require('object-sizeof')
+const FakeDevice = require('./fake-device')
+
+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 = []
+
+  let stats = {
+    devices: 0,
+    measurements: 0,
+    writes: 0,
+    size: 0,
+    errors: 0
+  }
+
+  /**
+   * Return device list
+   */
+  const getDevices = () => {
+    return devices
+  }
+
+  /**
+   * Return stats data
+   */
+  const getStats = () => {
+    return stats
+  }
+
+  /**
+   * 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++
+  }
+
+  /**
+   * 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)
+  }
+
+  /**
+   * Stop all spawned devices
+   */
+  const stop = () => {
+    for (let i = 0; i < stats.devices; i++) {
+      devices[i].stop()
+    }
+  }
+
+  return {
+    start,
+    stop,
+    getDevices,
+    getStats
+  }
+}

fake-device.js

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+/**
+ * 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')
+  }
+
+  let data = []
+
+  let __metricsInterval = null
+  let __sendInterval = null
+
+  /**
+   * Return data buffer
+   */
+  const getData = () => {
+    return data
+  }
+
+  /**
+   * Read data from sensors
+   * Will generate fake random data
+   */
+  const readData = () => {
+    function getRandomArbitrary (min, max) {
+      return Math.random() * (max - min) + min
+    }
+
+    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()
+
+    data.push(chunk)
+  }
+
+  /**
+   * 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)
+    })
+  }
+
+  /**
+   * Stop collecting data
+   */
+  const stop = () => {
+    clearInterval(__metricsInterval)
+    clearInterval(__sendInterval)
+  }
+
+  /**
+   * Start collecting data
+   */
+  const start = () => {
+    __metricsInterval = setInterval(readData, metricsInterval)
+    __sendInterval = setInterval(send, sendInterval)
+  }
+
+  if (autoStart) {
+    start()
+  }
+
+  return {
+    stop,
+    start,
+    send,
+    getData
+  }
+}

influx.js

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+const Influx = require('influx')
+
+module.exports = function init () {
+  const influx = new Influx.InfluxDB({
+    host: process.env.INFLUX_HOST || '172.18.0.1',
+    database: process.env.INFLUX_DATABASE || 'dummy-data',
+    schema: [
+      {
+        measurement: 'temperature',
+        fields: {
+          value: Influx.FieldType.INTEGER
+        },
+        tags: [
+          'deviceId'
+        ]
+      },
+      {
+        measurement: 'air_humidity',
+        fields: {
+          value: Influx.FieldType.INTEGER
+        },
+        tags: [
+          'deviceId'
+        ]
+      },
+      {
+        measurement: 'ground_humidity',
+        fields: {
+          value: Influx.FieldType.INTEGER
+        },
+        tags: [
+          'deviceId'
+        ]
+      },
+      {
+        measurement: 'airforce',
+        fields: {
+          value: Influx.FieldType.INTEGER
+        },
+        tags: [
+          'deviceId'
+        ]
+      }
+    ]
+  })
+  influx.createDatabase(process.env.INFLUX_DATABASE)
+  .catch(console.error)
+
+  return influx
+}
+

stats.js

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+const ProgressBar = require('progress')
+
+module.exports = function stats (deviceManager) {
+  const bar = new ProgressBar('Time :elapsed: | Devices :devices | Measurements :measurements | Writes :writes | Size :size kb | Errors :errors', {total: 1000000})
+
+  const update = stats => {
+    stats = JSON.parse(JSON.stringify(stats))
+    stats.size = Math.round((stats.size / 1024).toFixed(2))
+    bar.tick(stats)
+  }
+
+  setInterval(() => {
+    update(deviceManager.getStats())
+  }, 100)
+
+  return update
+}