Introduction
The container for the OpenRAP 2.0 has been developed on top of ext-framework. The additions on top of ext-framework are:
- SDK's like Global, Settings & Download Manager
- While the ext-framework has been designed to add plugins within a single application, the use case of OpenRAP 2.0 is that each application is a plugin within OpenRAP. Therefore OpenRAP container has been built on top of ext-framework to support this capability
Following is the high level component diagram of OpenRAP 2.0
SDK
Following are SDK's built into the container.
Global
/* * Plugin to register with the container on initialization. * pluginConfig = { * pluginVer: String, * apiToken: String, * apiBaseURL: String, * apiTokenRefreshFn: Function * } */ register = function(String pluginId, Object pluginConfig){}; /* * Get the plugin configuration. * @param pluginId String * @return pluginConfig */ get = function(String pluginId): pluginConfig {}
Telemetry SDK
/* * API to register a plugin and it's corresponding sync url to dispatch telemetry to. * config = {batchSize: 200, syncInterval: 30} * @param pluginId String * @param syncURL String - The server url to sync the telemetry to. * @param config Object - Telemetry sync configuration */ register = function(String pluginId, String syncURL, Object config){}; /* * Get the telemetry SDK instance. This can be injectable when the plugin uses typescript * @param pluginId String * @return Object TelemetrySDK */ getInstance = function(String pluginId) : TelemetrySDK {}; /* * API to log/store a telemetry event * @param event String */ send = function(String event) : Promise {}; /* * API to log/store an array of telemetry events * @param events String[] */ send = function(String[] events) : Promise {}; /* * API to receive a batch of telemetry events in zip stream * @param batchEvent String */ sendBatch = function(String batchEvent) : Promise {}; /* * API to receive a batch of telemetry events in zip stream * @param events byte[] - Zip stream of the events */ sendBatch = function(byte[] events) : Promise {}; /* * API to list the telemetry packets * @param status String - Get the packets based on the status * @return TelemetryPacket Document[] */ list = function(String status?) : TelemetryPacket[] {}; /* * API to get the telemetry data for a given packet. * @param packetId String * @return TelemetryPacket Document */ get = function(String packetId): TelemetryPacket {}; /* * API to force sync. This would create packets to be synced */ sync = function() : Promise {}; /* * API to get the status of events/batches for a given plugin id * @return Object - The status of the telemetry for ex: {events: 3456, batches: 20} */ getStatus = function() : Promise {};
Usage example
// Example to use telemetry SDK telemetrySDK = TelemetrySDK.getInstance(this.manifest.id); telemetrySDK.send({...}); telemetrySDK.send([{...}]); telemetrySDK.sync();
File SDK
getInstance = function(String pluginId) : FileSDK {}; mkdir = function(String path) : Promise {}; copy = function(String source, String dest) : Promise {}; mv = function(String from, String to) : Promise {}; rm = function(String file) : Promise {}; rmdir = function(String path) : Promise {}; zip = function(String path, String fileName) : Promise {}; unzip = function(String fileName, String path) : Promise {}; getAbsPath = function(String path) : String {}; watch = function(String[] paths, callback){};
Network SDK
isNetworkAvailable = function() : boolean {}; // EVENTS // Following are the events fired within the SDK network:available network:disconnected
Usage
EventManager.on('network:available', function() { // Do something. // May be sync telemetry. // Fetch content updates // Resume content downloads // etc });
Http SDK
getInstance = function(String pluginId) : HttpSDK {}; get = function(String url, Object options) : Promise {}; post = function(String url, Object data, Object options) : Promise {}; patch = function(String url, Object data, Object options) : Promise {}; delete = function(String url, Object options) : Promise {}; head = function(String url, Object options) : Promise {};
Download Manager
Following are the APIs for the download manager. The workflow of download manager is detailed out in the next few sections.
/* Method to get the instance of the download manager */ getInstance = function(String pluginId) : DownloadManager {}; /* * Method to queue the download of a file * @param file - The file to download * @param path - Path to download the file * @return downloadId - The download id reference */ download = function(String file, String path) : String {}; /* * Method to queue the download of a file * @param file - The file to download * @param path - Path to download the file * @return downloadId - The download id reference */ download = function(String[] files, String folder) : String {}; /* * Method to get the status of the download * @param downloadId String * @return Download object */ get = function(String downloadId) : DownloadObject {}; /* * Method to list the download queue based on the status * @param status String - The status of the download - Submitted, Complete, InProgress, Failed. Blank option will return all status * @return Array - Array of download objects */ list = function(String status): DownloadObject[] {}; DownloadObject = { id: String, // Download id status: String, // Submitted, InProgress, Complete, Failed. createdOn: Date, updatedOn: Date, stats: { totalFiles: Number, // Total files to download downloadedFiles: Number, // Total files downloaded so far totalSize: Number, // Total number of bytes to download downloadedSize: Number, // Total number of bytes downloaded so far }, files: [{ // Status of each file within the given download file: String, // File that is downloaded source: String, // source from where it is downloaded path: String, // Relative path where the file is downloaded to size: Integer, // Total file size in bytes downloaded: Integer // Downloaded until now }] } // EVENTS // Following are the events fired within the SDK "download:complete" EventManager.dispatch("download:complete", { id: String, // Download Id files: [{ file: String, // File that is downloaded source: String, // source from where it is downloaded path: String, // Relative path where the file is downloaded to size: Integer // file size in bytes }] });
Settings SDK
/* * Method to get the instance of the settings sdk */ getInstance = function(String pluginId) : SettingsSDK {}; /* * Method to put the setting * @param key String - The key for the config/setting * @param value Object - The value of the setting */ put: function(String key, Object value) : Promise {}; /* * Method to get the setting * @param key String - The key for the config/setting * @return value Object */ get: function(String key) : Promise {};
Open Questions:
- Does encryption needs to be part of container or plugin
Database Schema
Registry
{ document: { "_id": String, // Plugin Id "config": {} // Plugin config }, index: [] }
Settings
{ document: { "_id": String, // Setting id "value": Object // Setting value }, index: [] }
Telemetry
A document database is created for each plugin telemetry storage - <plugin_id>_telemetry
{ document: { "_id": String, // mid of the event "event": {} // event }, index: [] }
TelemetryPackets
{ document: { "_id": String, // packet id "pluginId": String, // Plugin id the packet belongs to "status": String, // status of the packet. Synced/NotSynced "createdOn": Date, // Date of packet creation "updatedOn": Date, // Date when the document is updated "size": Number, // Size of the events in the packet "events": [] // events }, index: [pluginId, status, updatedOn] }
DownloadQueue
{ document: { "_id": String, // Download Id "pluginId": String, // Plugin id the download object belongs to status: String, // Submitted, InProgress, Complete, Failed. createdOn: Date, updatedOn: Date, stats: { totalFiles: Number, // Total files to download downloadedFiles: Number, // Total files downloaded so far totalSize: Number, // Total number of bytes to download downloadedSize: Number, // Total number of bytes downloaded so far }, files: [{ // Status of each file within the given download file: String, // File that is downloaded source: String, // source from where it is downloaded path: String, // Relative path where the file is downloaded to size: Integer, // Total file size in bytes downloaded: Integer // Downloaded until now }] }, index: [pluginId, status, updatedOn] }
Folder Structure
Following is the folder structure of the container when it is installed on a dekstop/raspberrypi device/server
<app_base_dir> /logs |----/container.log |----/crash.log /<plugin_id>/ |----/files/ // Folder where the files are either download/imported |--------/file1.ar // Sample file |----/ecars/ // Folder where the ecar files are stored |--------/do_1234.ecar // Ecar file |----/logs/ // Plugin logs |--------/application.log |--------/crash.log |----/content/ |--------/<do_xxxxxx>/ // Path where the ecar files are extracted and served via http during play |----/telemetry_archived/ |--------/<packet_id>.json // Archived telemetry files that are either exported or synced.
Download Manager
Below explains the process of downloading content when a user request for it, the steps are
- Download Manager is initialised with config and will be ready to take the request
- When a user request for the download Sunbird Ed Plugin forward request to download Queue
- If download manager is available it will download the content and once it is download
- It will raise an event and plugin will listen to that event
- With event data it will extract the ECAR and index the content in content database
At low level the download manager works as
- When it starts downloading it creates <filename>.sud and <filename>.<n>.partial(s) files, <filename>.sud file contains the meta data about file.
- If internet is disconnected or system got shut down then it will pause the download
- When the internet is connected again or system restarted it will read the file .sud and continue the download from where it left
- When the file is download completed then it combines all the partials and creates final ECAR file.
For more details you can refer su-downloader3
Telemetry Sync
Telemetry Events
<To be done>
Logging
<To be done>