feat(timer-controllers): Added template for timer-based controllers

src/controllers/index.js

@@ -20,10 +20,14 @@ import UseCases from '../use-cases/index.js'
 // Load the REST API Controllers.
 import RESTControllers from './rest-api/index.js'
 
+// Load the time controller library
+import TimerControllers from './timer-controllers.js'
+
 class Controllers {
   constructor (localConfig = {}) {
     this.adapters = new Adapters()
     this.useCases = new UseCases({ adapters: this.adapters })
+    this.timerControllers = new TimerControllers({ adapters: this.adapters, useCases: this.useCases })
   }
 
   // Spin up any adapter libraries that have async startup needs.
@@ -53,10 +57,11 @@ class Controllers {
     // Wait for any startup processes to complete for the Adapters libraries.
     // await this.adapters.start()
 
-    // Attach the REST controllers to the Koa app.
-    // this.attachRESTControllers(app)
-
+    // Attach JSON RPC controllers
     this.attachRPCControllers()
+
+    // Attach and start the timer controllers
+    this.timerControllers.startTimers()
   }
 
   // Add the JSON RPC router to the ipfs-coord adapter.

src/controllers/timer-controllers.js

@@ -0,0 +1,65 @@
+/*
+  This Controller library is concerned with timer-based functions that are
+  kicked off periodicially.
+*/
+
+import config from '../../config/index.js'
+
+class TimerControllers {
+  constructor (localConfig = {}) {
+    // Dependency Injection.
+    this.adapters = localConfig.adapters
+    if (!this.adapters) {
+      throw new Error(
+        'Instance of Adapters library required when instantiating Timer Controller libraries.'
+      )
+    }
+    this.useCases = localConfig.useCases
+    if (!this.useCases) {
+      throw new Error(
+        'Instance of Use Cases library required when instantiating Timer Controller libraries.'
+      )
+    }
+
+    this.debugLevel = localConfig.debugLevel
+
+    // Encapsulate dependencies
+    this.config = config
+
+    // Bind 'this' object to all subfunctions.
+    this.exampleTimerFunc = this.exampleTimerFunc.bind(this)
+
+    this.startTimers()
+  }
+
+  // Start all the time-based controllers.
+  startTimers () {
+    // Any new timer control functions can be added here. They will be started
+    // when the server starts.
+    this.optimizeWalletHandle = setInterval(this.exampleTimerFunc, 60000 * 10)
+
+    return true
+  }
+
+  stopTimers () {
+    clearInterval(this.optimizeWalletHandle)
+  }
+
+  // Replace this example function with your own timer handler.
+  exampleTimerFunc (negativeTest) {
+    try {
+      console.log('Example timer controller executed.')
+
+      if (negativeTest) throw new Error('test error')
+
+      return true
+    } catch (err) {
+      console.error('Error in exampleTimerFunc(): ', err)
+
+      // Note: Do not throw an error. This is a top-level function.
+      return false
+    }
+  }
+}
+
+export default TimerControllers

test/unit/controllers/controllers.unit.js

@@ -28,6 +28,9 @@ describe('#Controllers', () => {
         attachRPCRouter: () => {}
       }
 
+      // Mock the timer controllers
+      sandbox.stub(uut.timerControllers, 'startTimers').returns()
+
       const app = {
         use: () => {}
       }

test/unit/controllers/timer-controllers.unit.js

@@ -0,0 +1,72 @@
+/*
+  Unit tests for the timer-controller.js Controller library
+*/
+
+// Public npm libraries
+import { assert } from 'chai'
+import sinon from 'sinon'
+
+// Local libraries
+import TimerControllers from '../../../src/controllers/timer-controllers.js'
+import adapters from '../mocks/adapters/index.js'
+import UseCasesMock from '../mocks/use-cases/index.js'
+
+describe('#Timer-Controllers', () => {
+  let uut
+  let sandbox
+
+  beforeEach(() => {
+    sandbox = sinon.createSandbox()
+
+    const useCases = new UseCasesMock()
+    uut = new TimerControllers({ adapters, useCases })
+  })
+
+  afterEach(() => {
+    sandbox.restore()
+
+    uut.stopTimers()
+  })
+
+  describe('#constructor', () => {
+    it('should throw an error if adapters are not passed in', () => {
+      try {
+        uut = new TimerControllers()
+
+        assert.fail('Unexpected code path')
+      } catch (err) {
+        assert.include(
+          err.message,
+          'Instance of Adapters library required when instantiating Timer Controller libraries.'
+        )
+      }
+    })
+
+    it('should throw an error if useCases are not passed in', () => {
+      try {
+        uut = new TimerControllers({ adapters })
+
+        assert.fail('Unexpected code path')
+      } catch (err) {
+        assert.include(
+          err.message,
+          'Instance of Use Cases library required when instantiating Timer Controller libraries.'
+        )
+      }
+    })
+  })
+
+  describe('#exampleTimerFunc', () => {
+    it('should kick off the Use Case', async () => {
+      const result = await uut.exampleTimerFunc()
+
+      assert.equal(result, true)
+    })
+
+    it('should return false on error', async () => {
+      const result = await uut.exampleTimerFunc(true)
+
+      assert.equal(result, false)
+    })
+  })
+})