...

https://drive.google.com/file/d/11QXXM9WBg8Sw76Eikg5FyodrpIfoBnkL/view

Image Modified

DAC_AWC_LISA.mp4

Example of application using LISA api

...

TODO: Point to code where in resident UI of VA LISA is used (on RDK6.1 VA image) 

Detailed LISA design

...

comparison to RDK Packager

LISA is an alternative to the Packager Thunder Plugin used to retrieve ipkg packages, see https://github.com/rdkcentral/rdkservices/blob/master/Packager/doc/PackagerPlugin.md   

...

...

1. Application-specific:
   • Mandatory application metadata (type, id, version, source URL, name, category)
     • setting on installation request
     • getting
   • DAC bundles
     • downloading
     • deleting
   • Generic resources (files, e.g. icons)
     • downloading,
     • deleting
   • Auxiliary application metadata, dedicated API for:
     • setting
     • updating
     • getting
   • Persistent storage for application
     • creating
     • resetting
     • deleting
   • Storage/persistent storage usage checking
     • getting
2. Global
   • Storage usage checking
     • getting

API design

Formal definition

Before implementation, at the design stage, the following API in json schema has been defined defined LISA API .

In later design phase additional lock/unlock api allowing external application manager to signal LISA that a specific app from LISA database is in active use by End user and hence should not be deleted/upgraded at this moment, see description in  LISA API Extension (Locking mechanism)#APISchema

Actual Thunder interface definition/api is in defined in dual COM RPC / JSON- RPC interface in in https://github.com/rdkcentral/ThunderInterfaces/blob/R2/interfaces/ILISA.h with annotations to automatically autogenerate* the JSON RPC api at build time

Below is description of expected api behaviour in expected use cases.

Overview

In section below we provide more explanation with the API methods.

API is API to be exposed in JSON-RPC over WebSocket 

Generic format (see with https://www.jsonrpc.org/specification and https://github.com/rdkcentral/rdkservices/blob/master/SystemServices/README.md):

WebSocket like other JSON-RPC thunder services 

For mat is of style :

{"jsonrpc":"2.0"

{"jsonrpc":"2.0","id":{id},"method":"com.lgi.dac.lisa.1.methodName", "params":{payload}}

{id} - An identifier established by the Client that MUST contain a String, Number, or NULL value if included. If it is not included it is assumed to be a notification.

{payload} - A Structured value that holds the parameter values to be used during the invocation of the method. This member MAY be omitted.

Methods

• install 

Download the application bundle tarball from the given URL, unpack files to dedicated directory, create the db entries and persistent storage on success. Asynchronous operation, handle should be used for tracking the request. The id of an app is unique within the database. That means only one kind of (mime)type can be combined and saved with a specific app id.

...

• uninstall

Uninstall the application: remove application files and - optionally - persistent storage and db entry. Non-blocking operation, handle should be used for tracking the request.

...

• reset

Deletes the content of the database and/or persistent storage and/or all resources for the application. Synchronous operation, returns response on success or failure. Optional parameters type, id, version are used to filter the applications on which the reset will be performed. If they are not given, the reset operation affects all the data. Synchronous operation, returns a response on success or failure. 

...

• getList

Returns a list of installed applications filtered using optional filtering criteria: type, id, version, appName, category. Synchronous operation, returns a response on success or failure.

...

• getProgress

Get estimated progress of an asynchronous operation.

...

Events

• operationStatus

Notification sent on the completion of asynchronous operation.

...

• requesting for Content-Length HTTP header before actual transfer, to check for available space and to store the size of the resource
• updating the counter of downloaded bytes on the successful transfer of each data chunk (see libcurl CURLOPT_WRITEFUNCTION)
• returning the updated value of progress parameter on invocation of getProgress API.

Block diagram

Logical modules

LISA auth module

(is not IMPLEMENTED, was not required for MVP since bundles are encrypted and signed)

API to be implemented by the library:

• getAuthenticationMethod(appType, id, URL); returned value should indicate one of method:
  • NONE
  • BASIC_AUTH
  • API_KEY_IN_REQUEST
  • API_KEY_IN_HEADER
  • API_KEY_IN_COOKIE
  • CLIENT_CERT
  • BEARER_TOKEN (Oauth2)
• getAPIKey(appType, id, URL, *key, bufferSize); value returned in key buffer contains API key to be included to the request; returns 0 on success, 1 on error (buffer too small), 2 on other errors
• getCredentials(appType, id, URL, *user, *password, bufferSize); returns user/apssword; returns 0 on success, 1 on error (buffer too small), 2 on other errors
• getClientCertsFile(appType, id, URL, *privKeyFileName, *privKeyPassphrase, *clientCertFileName, bufferSize); returns certificate file names; returns 0 on success, 1 on error (buffer too small), 2 on other errors
• getToken(appType, id, URL, *token, bufferSize); returns bearer token; returns 0 on success, 1 on error (buffer too small), 2 on other errors

Metadata

...

sqlite usage

sqlite database schema

...

-- enable support for foreign keys, available since sqlite version 3.6.19 (2009-10-14)
PRAGMA foreign_keys = ON;

-- table for application ids and persistent storage
CREATE TABLE IF NOT EXISTS apps(
idx INTEGER PRIMARY KEY, -- unique index for the application type/id
type TEXT NOT NULL, -- MIME type 
app_id TEXT UNIQUE NOT NULL, -- unique id of app within given MIME type
data_path TEXT, -- path to app peristent storage, relative to [APPS_STORAGE]/{epoch}
created TEXT NOT NULL -- unix epoch timestamp of when the application entry was created 
);

-- table for installed applications in specific versions
CREATE TABLE IF NOT EXISTS installed_apps (
idx INTEGER PRIMARY KEY, -- unique index for the application type/id/version
app_idx INTEGER NOT NULL, -- reference to apps table, index of the application type/id
version TEXT NOT NULL, -- version of the application
name TEXT NOT NULL, -- name of the application
category TEXT, -- category
url TEXT, -- URL from which the application was downloaded
app_path TEXT, -- path to app files, realtive to [APPS]/{epoch}
created TEXT NOT NULL, -- unix epoch timestamp of when the application was installed
resources TEXT, -- json object with downloaded resources metadata
metadata TEXT, -- json object with auxiliary resources metadata
FOREIGN KEY(app_idx) REFERENCES apps(idx),
UNIQUE(app_idx, version)
);

sqlite quick startup 

1. print tables
SELECT sql FROM sqlite_master WHERE name = 'apps';
SELECT sql FROM sqlite_master WHERE name = 'installed_apps';

...

6. set meatdata for given app/version
SELECT DISTINCT installed_apps.idx,installed_apps.metadata FROM installed_apps,apps WHERE apps.type='application/vnd.rdk-app.dac.native' AND apps.app_id='com.lgi.app3' AND installed_apps.version="1.0.0";
UPDATE installed_apps SET metadata = '{[{"description","New nice application."},{"parental":"5"}]}' WHERE idx=<idx>;

Storages for data

The logical storages: [APPS] and [APPS_STORAGE] should be defined per platform, to use concrete physical storages.

Epoch

Epoch indicator {epoch} is used for easy invalidation of not supported or revoked format of apps on fundamental changes. May also be used for the antirollback (db authentication - TBD?)

Application files: [APPS]

[APPS] storage for Application bundle 

files of App in App oci bundle Apps files are stored in [APPS] storage. 

...

• App's files: [APPS]/dac/images/{epoch}/{id}/{version}/
• App's auxiliary resources (e.g. icons), currently not implemented: [APPS]/dac/images/{epoch}{id}/{version}/resLISA's db:  [APPS]/dac/db/{epoch}/apps.db
• Temporary files storage (for downloaded files before unpacking), referred as [APPS_TMP]: 
  • [APPS_TMP] is located in [APPS]/dac/images/tmp
  • [APPS_TMP]/{id}/{version}/ - used for downloading application of given id and given version

...

Important, LISA's database can be located there eg :  [APPS]/dac/db/{epoch}/apps.db

[APPS_STORAGE]  persistent storage area an App can use:

Apps persistent storage is located in [APPS_STORAGE]. 

...

Apps' persistent storage: [APPS_STORAGE]/dac/{epoch}/{id}/

...

Epoch

Epoch indicator {epoch} is used for easy invalidation of not supported or revoked format of apps on fundamental changes. May also be used for the antirollback (db authentication - TBD?)

LISA logic per use case

Initialization

Maintenance and Cleanup

Install

Uninstall

Download

LISA implementation

LISA should be implemented as a Thunder plugin.

An implementation may be based on the Packager code.

Lisa Thunder plugin configuration

config schema

{
	"$schema": "plugin.schema.json",
    "jsonrpc":"2.0",
	"info": {
		"title": "Local Inventory & Storage Manager of DAC Apps (LISA) Plugin",
        "class": "Lisa",
		"callsign": "org.rdk.dac.lisa",
		"locator": "libWPEFrameworkLisa.so",
		"status": "alpha",
		"autostart": true,
		"description": "The Local Inventory & Storage Manager of DAC Apps (LISA) plugin allows authenticated downloading and management of DAC bundles from a remote server. It also manages the persistent storage of the DAC applications.",
		"version": "1.0"
	},
	"interface": {
		"$ref": "{interfacedir}/lisa.json#"
	},
	"configuration": {
		"type": "object",
		"properties": {
			"configuration": {
				"type": "object",
				"properties": {
					"network": {
						"type": "object",
						"required": [
							"timeout",
							"default_retryIn"
						],
						"properties": {
							"timeout": {
								"type": "number",
								"description": "Single resource downloading timeout in seconds"
							},
							"default_retryIn": {
								"type": "number",
								"description": "Default value of GET retry delay in seconds on HTTP/202, when no "Retry-After" header field is returned in the response."
							}
						}
					},
					"storages": {
						"type": "object",
						"required": [
							"apps",
							"apps_storage",
							"apps_tmp"
						],
						"properties": {
							"apps": {
								"type": "string",
								"description": "Path to the persistent storage for downloaded applications top dir"
							},
							"apps_storage": {
								"type": "string",
								"description": "Path to the persistent storage for downloaded applications persistent storage top dir"
							},
							"apps_tmp": {
								"type": "string",
								"description": "Path to the temporary storage for applications being downloaded"
							}
						}
					}
				},
				"required": [
					"timeout",
					"storages"
				]
			}
		}
	}
}

example lisa thunder plugin config

{
	"$schema": "plugin.schema.json",
	"jsonrpc":"2.0",
	"info": {
		"title": "Local Inventory & Storage Manager of DAC Apps (LISA) Plugin",
        "class": "Lisa",
		"callsign": "org.rdk.dac.lisa",
		"locator": "libWPEFrameworkLisa.so",
		"status": "alpha",
		"autostart": true,
		"description": [
			"The Local Inventory & Storage Manager of DAC Apps (LISA) plugin allows authenticated downloading and management of DAC bundles from a remote server. It also manages the persistent storage of the DAC applications."
		],
		"version": "1.0"
	},
	"interface": {
		"$ref": "{interfacedir}/lisa.json"
	},
	"configuration": {
		"storages": {
			"apps": "/mnt/apps",
			"apps_storage": "/mnt/apps_storage",
			"apps_tmp": "/mnt/apps_tmp"
		},
		"network": {
			"timeout": 1800,
			"default_retryIn": 300
		}
	}
}

...