feat: Datafile management

packages/datafile-manager/.gitignore

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+lib

packages/datafile-manager/.nvmrc

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+v10

packages/datafile-manager/CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+Changes that have landed but are not yet released.
+
+### Changed
+- Changed value for node in engines in package.json from >=4.0.0 to >=6.0.0
+
+## [0.2.0] - April 9, 2019
+
+### Changed
+- Increase max error count in backoff controller (can now delay requests for up to 512 seconds) [(#17)](https://github.com/optimizely/javascript-sdk-dev/pull/17)
+- Change expected format of `urlTemplate` to be sprintf-compatible (`%s` is replaced with `sdkKey`) [(#17)](https://github.com/optimizely/javascript-sdk-dev/pull/17)
+- Promise returned from `onReady` is resolved immediately when `datafile` provided in constructor [(#14)](https://github.com/optimizely/javascript-sdk-dev/pull/14)
+- Emit update event whenever datafile changes, not only if `autoUpdate` is true [(#14)](https://github.com/optimizely/javascript-sdk-dev/pull/14)
+
+### Fixed
+
+- Fix for Node.js requests when `urlTemplate` contains a port [(#18)](https://github.com/optimizely/javascript-sdk-dev/pull/18)
+
+## [0.1.0] - March 4, 2019
+
+Initial release

packages/datafile-manager/LICENSE

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packages/datafile-manager/README.md

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+# Javascript SDK Datafile Manager
+
+This package provides a datafile manager implementations for Node.js and the browser.
+
+## Installation
+
+```sh
+npm install @optimizely/js-sdk-datafile-manager
+```
+
+## Usage
+
+```js
+const { DatafileManager } = require('@optimizely/js-sdk-datafile-manager')
+
+const manager = new DatafileManager({
+  sdkKey: '9LCprAQyd1bs1BBXZ3nVji',
+  autoUpdate: true,
+  updateInterval: 5000,
+})
+manager.start()
+manager.onReady().then(() => {
+  const datafile = manager.get()
+  console.log('Manager is ready with datafile: ')
+  console.log(datafile)
+})
+manager.on('update', ({ datafile }) => {
+  console.log('New datafile available: ')
+  console.log(datafile)
+})
+```

packages/datafile-manager/__test__/backoffController.spec.ts

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+/**
+ * Copyright 2019, Optimizely
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import BackoffController from '../src/backoffController'
+
+describe('backoffController', () => {
+  describe('getDelay', () => {
+    it('returns 0 from getDelay if there have been no errors', () => {
+      const controller = new BackoffController()
+      expect(controller.getDelay()).toBe(0)
+    })
+
+    it('increases the delay returned from getDelay (up to a maximum value) after each call to countError', () => {
+      const controller = new BackoffController()
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThanOrEqual(8000)
+      expect(controller.getDelay()).toBeLessThan(9000)
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThanOrEqual(16000)
+      expect(controller.getDelay()).toBeLessThan(17000)
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThanOrEqual(32000)
+      expect(controller.getDelay()).toBeLessThan(33000)
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThanOrEqual(64000)
+      expect(controller.getDelay()).toBeLessThan(65000)
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThanOrEqual(128000)
+      expect(controller.getDelay()).toBeLessThan(129000)
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThanOrEqual(256000)
+      expect(controller.getDelay()).toBeLessThan(257000)
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThanOrEqual(512000)
+      expect(controller.getDelay()).toBeLessThan(513000)
+      // Maximum reached - additional errors should not increase the delay further
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThanOrEqual(512000)
+      expect(controller.getDelay()).toBeLessThan(513000)
+    })
+
+    it('resets the error count when reset is called', () => {
+      const controller = new BackoffController()
+      controller.countError()
+      expect(controller.getDelay()).toBeGreaterThan(0)
+      controller.reset()
+      expect(controller.getDelay()).toBe(0)
+    })
+  })
+})