Introduction
The container for the OpenRAP 2.0 has been developed on top of ext-framework. The additions on top of ext-framework are:
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Telemetry SDK
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//*
* API to register a plugin and it's corresponding sync url to dispatch telemetry to.
// * config = {batchSize: 200, syncInterval: 30}
register =* function(String@param pluginId, String
* @param syncURL, Object config){};
// Get String - The server url to sync the telemetry SDK instanceto.
This can* be@param injectableconfig whenObject the- pluginTelemetry usessync typescript
getInstanceconfiguration
*/
register = function(String pluginId) : TelemetrySDK , String syncURL, Object config){};
//*
API to* log/storeGet athe telemetry eventSDK sendinstance. =This function(String event) : Promise {};
// API to log/store an array of telemetry events
sendcan be injectable when the plugin uses typescript
* @param pluginId String
* @return Object TelemetrySDK
*/
getInstance = function(Array[String] eventspluginId) : PromiseTelemetrySDK {};
//*
* API to receivelog/store a telemetry event
batch of* telemetry@param eventsevent inString
zip stream*/
sendBatchsend = function(String batchEventevent) : Promise {};
//*
* API to receive a batchlog/store an array of telemetry events in zip stream
sendBatch
* @param events String[]
*/
send = function(byteString[] events) : Promise {};
//*
list =* function()API :to TelemetryPacket[] {};
get = function(String packetId): TelemetryPacket {};
// API to force sync. This would create packets to be synced
sync = function(receive a batch of telemetry events in zip stream
* @param batchEvent String
*/
sendBatch = function(String batchEvent) : Promise {};
//*
* API to getreceive thea statusbatch of telemetry events/batches in forzip astream
given plugin* id@param // Responseevents byte[] - {events: 3456, batches: 20}
getStatusZip stream of the events
*/
sendBatch = function(byte[] events) : Promise {}; |
Usage example
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// Example to use telemetry SDK
telemetrySDK = TelemetrySDK.getInstance(this.manifest.id);
telemetrySDK.send({...});
telemetrySDK.send([{...}]);
telemetrySDK.sync(); |
File SDK
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getInstance = function(String pluginId) : FileSDK {};
mkdir
/*
* API to list the telemetry packets
* @param status String - Get the packets based on the status
* @return TelemetryPacket Document[]
*/
list = function(String pathstatus?) : PromiseTelemetryPacket[] {};
copy/* =
function(String source,* StringAPI dest)to :get Promisethe {};telemetry data mvfor =a function(String from, String to) : Promise {};
rm = function(String file) : Promise {};
rmdirgiven packet.
* @param packetId String
* @return TelemetryPacket Document
*/
get = function(String pathpacketId) : PromiseTelemetryPacket {};
zip
=/* function(String
path, String* fileName)API :to Promise {};
unzip = function(String fileName, String path) : Promise {};
getAbsPathforce sync. This would create packets to be synced
*/
sync = function(String path) : StringPromise {};
watch/* =
function(String[] paths, callback){};
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Network SDK
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isNetworkAvailable = function() : boolean {};
// Events
// Following are the events fired within the SDK
network:available
network:disconnected |
Usage
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EventManager.on('network:available', function() {
// Do something.
// May be sync telemetry.
// Fetch content updates
// Resume content downloads
// etc
}); |
...
* 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
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getInstance = function(String pluginId) : HttpSDK {};
get// Example to use telemetry SDK
telemetrySDK = TelemetrySDK.getInstance(this.manifest.id);
telemetrySDK.send({...});
telemetrySDK.send([{...}]);
telemetrySDK.sync(); |
File SDK
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getInstance = function(String url, Object optionspluginId) : FileSDK {};
mkdir = function(String path) : Promise {};
postcopy = function(String urlsource, Object data, Object optionsString dest) : Promise {};
patchmv = function(String urlfrom, Object data, Object optionsString to) : Promise {};
deleterm = function(String url, Object optionsfile) : Promise {};
headrmdir = function(String url, Object optionspath) : Promise {}; |
Download Manager
Following are the APIs for the download manager. The workflow of download manager is detailed out in the next few sections.
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/* Method to get the instance of the download manager */
getInstance
zip = function(String path, String fileName) : Promise {};
unzip = function(String pluginIdfileName, String path) : DownloadManagerPromise {};
/*getAbsPath = function(String *path) Method: toString queue{};
the
downloadwatch 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[] paths, callback){};
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Network SDK
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isNetworkAvailable = function() : boolean {};
// EVENTS
// Following are the events fired within the SDK
network:available
network:disconnected |
Usage
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EventManager.on('network:available', function() {
// Do something.
// May be sync telemetry.
// Fetch content updates
// Resume content downloads
// etc
}); |
Http SDK
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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.
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/* Method to get the instance of the download manager */
getInstance = function(String downloadIdpluginId) : DownloadObjectDownloadManager {};
/*
* Method to listqueue the download queueof baseda on thefile
status * @Param@param status Stringfile - The statusfile of theto download
- Submitted,* Complete,@param InProgress,path Failed.- BlankPath optionto willdownload returnthe all statusfile
* @return ArraydownloadId - ArrayThe ofdownload downloadid objectsreference
*/
listdownload = function(String status): DownloadObject[]file, String path) : String {};
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
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/* Method to get the instance of the settings sdk */
getInstance = function(String pluginId) : SettingsSDK {};
put: function(String key, Object value) : Promise {};
get: function(String key) : Promise {}; |
Open Questions:
- Does encryption needs to be part of container or plugin
Database Schema
Registry
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{
document: {
"_id"* 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 pause the download
* @param downloadId String
*/
pause = function(String downloadId) : Promise {};
/*
* Method to cancel the download
* @param downloadId String
*/
cancel = function(String downloadId) : Promise {};
/*
* Method to pause all the downloads for the given plugin
* @param downloadId String
*/
pauseAll = function() : Promise {};
/*
* Method to cancel all the downloads for the given plugin
* @param downloadId String
*/
cancelAll = function() : Promise {};
/*
* 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, // PluginDownload Idid
"config"status: {}String, // PluginSubmitted, configInProgress, }Complete, index: []
} |
Settings
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{
document: {
"_id": String, // Setting id
"value": Object // Setting value
},
index: []
} |
Telemetry
A document database is created for each plugin telemetry storage - <plugin_id>_telemetry
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{
document: {
"_id": String, // mid of the event
"event": {} // event
},
index: []
} |
TelemetryPackets
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{
document: {
"_id"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, // packetFile id
that is downloaded
"pluginId"source: String, // source from Pluginwhere idit theis packetdownloaded
belongs to "status"path: String, // Relative statuspath ofwhere the packet. Synced/NotSynced file is downloaded to
"createdOn"size: DateInteger, // Date of packet creation Total file size in bytes
"updatedOn"downloaded: Date,Integer // Downloaded Dateuntil now
when the document }]
is}
updated
"size": Number,
// EVENTS
// SizeFollowing ofare the events fired inwithin the packet
"events": [] // events
},
index: [pluginId, status, updatedOn]
} |
DownloadQueue
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{
document: {
"_id"SDK
"<plugin>:download:complete"
EventManager.dispatch("sunbirded:download:complete", {
id: String, // Download Id
files: [{
file: String, // File that Downloadis Iddownloaded
"pluginId"source: String, // Pluginsource idfrom thewhere downloadit objectis belongsdownloaded
to
statuspath: String, // Submitted,Relative InProgress,path Complete,where Failed.
createdOn: Date,
updatedOn: Date,
stats: {
totalFiles: Number,the file is downloaded to
size: Integer // Totalfile filessize toin downloadbytes
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
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<app_base_dir>
/logs
|----/container.log
|----/crash.log
/<plugin_id>
|----/files // Folder where the files are either download/imported
|----/ecars // Folder where the ecar files are stored
|----/logs // Plugin logs
|--------/application.log
|--------/crash.log
|----/content
|--------/<do_xxxxxx> // Path where the ecar files are extracted and served via http during play |
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
Image Removed
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
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Telemetry Sync
Here we have two approaches to sync telemetry efficiently below will explain the them with pros and cons and concludes on one.
Solution 1:
This solution is having two steps to sync the telemetry in first step there will be a process which will execute every <x> minutes(configurable) in this method below steps are performed
- Read the events form telemetry database
- Events will be divided into equal numbers as batches of size <x> events(configurable)
- The events will be compressed(.gzip) and stored in telemetry folder
- Same events will be deleted from Telemetry database.
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Below diagram shows the second step process which is again a process which will execute in every <x> minutes(configurable) below are the steps executed
- Check the internet connectivity if available read all the event(s) files from telemetry folder
- Sync the events to server and after each file is synced move them to telemetryArchive folder
- The files in telemetry archive folder will be deleted in <x> days(configurable)
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Pros:
1. No dependency on database availability while syncing telemetry to server
2. There is clear separation in creation of compressed telemetry and syncing compressed telemetry to server
3. If the database is crashed or uninstalled by user still we have telemetry in file system since we are reading and storing them in file system
Cons:
1. User can delete the telemetry files from file system
2. More number of I/O operation on file system
3. Possibility of telemetry sync failure is high
Solution 2:
This solution will have only one process which will be executed in every <x> minutes(configurable) . Below are the steps
- Check for network connection if available ready the events from telemetry database
- Events will be divided into equal numbers as batches of size <x> events(configurable)
- Sync the events to server and after each file is synced move them to telemetryArchive folder
- The files in telemetry archive folder will be deleted in <x> days(configurable)
- Same events will be deleted from Telemetry database
- Above steps from step3 to step5 will be executed in series for each batch of events
Image Removed
Pros:
1. Less chance of telemetry being lost due to user actions
2. Telemetry sync failure is low
3. Less number of I/O operation which result in more performance
4. Easy to develop and test
5. There is single source of data which is not synced to server which will help in export process.
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1. Dependency on database availability
2. Possibility of duplicate telemetry sync if the process execution time is less
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Settings SDK
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/*
* 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
plugin_registry
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{
document: {
"_id": String, // Plugin Id
"config": {} // Plugin config
},
index: []
} |
settings
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{
document: {
"_id": String, // Setting id
"value": Object // Setting value
},
index: []
} |
telemetry
A document database is created for each plugin telemetry storage - <plugin_id>_telemetry
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{
document: {
"_id": String, // mid of the event
"event": {} // event
},
index: []
} |
telemetry_packets
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{
document: {
"_id": String, // packet id
"pluginId": String, // Plugin id the packet belongs to
"status": String, // status of the packet. Synced/NotSynced
"statusMsg": String, // Associated message to the status
"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]
} |
download_queue
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{
document: {
"_id": String, // Download Id
"pluginId": String, // Plugin id the download object belongs to
status: String, // Submitted, InProgress, Complete, Failed.
statusMsg: String, // Associated message to the status
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
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<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
Image Added
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
Image Added
Telemetry Sync
Image Added
Telemetry Events
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