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-Controler AAAA(AGL Advance Audio Controler) and more.
-------------------------------------------------------------
-
- * Object: Generic Controler to handle Policy,Small Business Logic, Glue in between components, ...
- * Status: Release Candidate
- * Author: Fulup Ar Foll fulup@iot.bzh
- * Date : August-2017
-
-## Functionalities:
- - Create an application dedicate controller from a JSON config file
- - Each controls (eg: navigation, multimedia, ...) is a suite of actions. When all actions succeed control is granted, if one fail control acces is denied.
- - Actions can either be:
- + Invocation to an other binding API, either internal or external (eg: a policy service, Alsa UCM, ...)
- + C routines from a user provider plugin (eg: policy routine, proprietary code, ...)
- + Lua script function. Lua provides access to every AGL appfw functionalities and can be extended from C user provided plugins.
-
-## Installation
- - Controler is a native part of AGL Advance Audio Framework but may be used independently with any other service or application binder.
- - Dependencies: the only dependencies are audio-common for JSON-WRAP and Filescan-utils capabilities.
- - Controler relies on Lua-5.3, when not needed Lua might be removed at compilation time.
-
-## Config
-
-Configuration is loaded dynamically during startup time. The controller scans CONTROL_CONFIG_PATH for a file corresponding to pattern
-"onload-bindername-xxxxx.json". When controller runs within AAAA binder it searches for "onload-audio-xxxx.json". First file found in the path the loaded
-any other files corresponding to the same pather are ignored and only generate a warning.
-
-Each bloc in the configuration file are defined with
- * label: must be provided is used either for debugging or as input for the action (eg: signal name, control name, ...)
- * info: optional used for documentation purpose only
-
-Note by default controller config search path is defined at compilation time, but path might be overloaded with CONTROL_CONFIG_PATH
-environment variable. Setenv 'CONTROL_ONLOAD_PROFILE'=xxxx to overload 'onload-default-profile' initialisation sequence.
-
-### Config is organised in 4 sections:
-
- * metadata
- * onload defines the set of action to be executed at startup time
- * control defines the set of controls with corresponding actions
- * event define the set of actions to be executed when receiving a given signal
-
-### Metadata
-
-As today matadata is only used for documentation purpose.
- * label + version mandatory
- * info optional
-
-### OnLoad section
-
-Defines startup time configuration. Onload may provide multiple initialisation profiles, each with a different label.
- * label is mandatory. Label is used to select onload profile at initialisation through DispatchOneOnLoad("onload-label") API;
- * info is optional
- * plugin provides optional unique plugin name. Plugin should follow "onload-bindername-xxxxx.ctlso" patern
- and are search into CONTROL_PLUGIN_PATH. When defined controller will execute user provided function context=CTLP_ONLOAD(label,version,info).
- The context returned by this routine is provided back to any C routines call later by the controller. Note that Lua2C function
- are prefix in Lua script with plugin label (eg: MyPlug: in following config sample)
- * lua2c list of Lua commands shipped with provided plugin.
- * require list of binding that should be initialised before the controller starts. Note that some listed requirer binding might be absent,
- nevertheless any present binding from this list will be started before controller binding, missing ones generate a warning.
- * action the list of action to execute during loadtime. Any failure in action will prevent controller binding from starting.
-
-### Control section
-
-Defines a list of controls that are accessible through (api="control", verb="request", control="control-label").
-
- * label mandatory
- * info optional
- * permissions Cynara needed privileges to request this control (same as AppFw-V2)
- * action the list of actions
-
-### Event section
-
-Defines a list of actions to be executed on event reception. Even can do anything a controller can (change state,
-send back signal, ...) eg: if a controller subscribes to vehicule speed, then speed-event may ajust master-volume to speed.
-
- * label mandatory
- * info optional
- * action the list of actions
-
-### Actions Categories
-
-Controler support tree categories of actions. Each action return a status status where 0=success and 1=failure.
- * AppFw API, Provides a generic model to request other bindings. Requested binding can be local (eg: ALSA/UCM) or
- external (eg: vehicle signalling).
- * api provides requested binding API name
- * verb provides verb to requested binding
- * args optionally provides a jsonc object for targeted binding API. Note that 'args' are statically defined
- in JSON configuration file. Controler client may also provided its own arguments from the query list. Targeted
- binding receives both arguments defined in the config file and the argument provided by controller client.
- * C-API, when defined in the onload section, the plugin may provided C native API with CTLP-CAPI(apiname, label, args, query, context).
- Plugin may also create Lua command with CTLP-Lua2C(LuaFuncName, label, args, query, context). Where args+query are JSONC object
- and context the value return from CTLP_ONLOAD function. Any missing value is set to NULL.
- * Lua-API, when compiled with Lua option, the controller support action defined directly in Lua script. During "onload" phase the
- controller search in CONTROL_Lua_PATH file with pattern "onload-bindername-xxxx.lua". Any file corresponding to this pattern
- is automatically loaded. Any function defined in those Lua script can be called through a controller action. Lua functions receive
- three parameters (label, args, query).
-
-Note: Lua added functions systematically prefix. AGL standard AppFw functions are prefixed with AGL: (eg: AGL:notice(), AGL_success(), ...).
-User Lua functions added though the plugin and CTLP_Lua2C are prefix with plugin label (eg: MyPlug:HelloWorld1).
-
-### Avaliable Application Framework Commands
-
-Each Lua AppFw commands should be prefixed by AFB:
-
- * AFB:notice ("format", arg1,... argn) LUA table are print directly as json string with '%s'.
- AFB:error, AFB:warning, AFB:info, AFB:debug work on the same model. Printed message are limited to 512 characters.
-
- * AFB:service ('API', 'VERB', {query}, "Lua_Callback_Name", {context}) asynchronous call to an other binding. When empty query/context should be set to '{}'
- and not to 'nil'. When 'nil' Lua does not send 'NULL' value but remove arguments to calling stack. WARNING:"Callback"
- is the name of the callback as a string and not a pointer to the callback. (If someone as a solution to fix this, please
- let me known). Callback is call as LUA "function Alsa_Get_Hal_CB (error, result, context)" where:
- * error is a Boolean
- * result is the full answer from AppFw (do not forget to extract response)
- * context is a copy of the Lua table pas as argument (warning it's a copy not a pointer to original table)
-
- * error,result=AFB:servsync('API', 'VERB', {query}) Save as previous but for synchronous call. Note that Lua accept multiple
- return. AFB:servsync return both the error message and the response as a Lua table. Like for AFB:service user should not
- forget to extract response from result.
-
- * AFB:success(request, response) request is the opaque handle pass when Lua is called from (api="control", verb="docall").
- Response is a Lua table that will be return to client.
-
- * AFB:fail(request, response) same as for success. Note that LUA generate automatically the error code from Lua function name.
- The response is tranformed to a json string before being return to client.
-
- * EventHandle=AFB:evtmake("MyEventName") Create an event and return the handle as an opaque handle. Note that due to a limitation
- of json_object this opaque handle cannot be passed as argument in a callback context.
-
- * AFB:subscribe(request, MyEventHandle) Subscribe a given client to previously created event.
-
- * AFB:evtpush (MyEventHandle, MyEventData) Push an event to every subscribed client. MyEventData is a Lua table that will be
- send as a json object to corresponding clients.
-
- * timerHandle=AFB:timerset (MyTimer, "Timer_Test_CB", context) Initialise a timer from MyTimer Lua table. This table should contend 3 elements:
- MyTimer={[l"abel"]="MyTimerName", ["delay"]=timeoutInMs, ["count"]=nBOfCycles}. Note that is count==0 then timer is cycle
- infinitively. Context is a standard Lua table. This function return an opaque handle to be use to further control the timer.
-
- * AFB:timerclear(timerHandle) Kill an existing timer. Return an error when timer does not exit.
-
- * MyTimer=AFB:timerget(timerHandle) Return Label, Delay and Count of an active timer. Return an error when timerHandle does not
- point on an active timer.
-
-Note: Except for function call during binding initialisation period. Lua call are protected and should return clean message
- even when improperly used. If you find bug please report.
-
-### Adding Lua command from User Plugin
-
-User Plugin is optional and may provide either native C-action accessible directly from controller actions as defined in
-JSON config file, or alternatively may provide at set of Lua commands usable inside any script (onload, control,event). A simple
-plugin that provide both natice C API and Lua commands is provided as example (see ctl-plugin-sample.c). Technically a
-plugin is a simple sharelibrary and any code fitting in sharelib might be used as a plugin. Developer should nevertheless
-not forget that except when no-concurrency flag was at binding construction time, any binding should to be thread safe.
-
-A plugin must be declare with CTLP_REGISTER("MyCtlSamplePlugin"). This entry point defines a special structure that is check
-at plugin load time by the controller. Then you have an optional init routine declare with CTLP_ONLOAD(label, version, info).
-This init routine receives controller onload profile as selected by DispatchOnLoad("profile"). The init routine may create
-a plugin context that is later one presented to every plugin API this for both LUA and native C ones. Then each:
-
- * C API declare with CTLP_CAPI (MyCFunction, label, argsJ, queryJ, context) {your code}. Where:
- * MyFunction is your function
- * Label is a string containing the name of your function
- * ArgsJ a json_object containing the argument attach the this control in JSON config file.
- * context your C context as return from CTLP_ONLOAD
-
- * Lua API declarewith TLP_LUA2C (MyLuaCFunction, label, argsJ, context) {your code}. Where
- * MyLuaCFunction is both the name of your C function and Lua command
- * Label your function name as a string
- * Args the arguments passed this time from Lua script and not from Json config file.
- * Query is not provided as LuaC function are called from a script and not directly from controller action list.
-
-Warning: Lua samples use with controller enforce strict mode. As a result every variables should be declare either as
-local or as global. Unfortunately "luac" is not smart enough to handle strict mode at build time and errors only appear
-at run time. Because of this strict mode every global variables (which include functions) should be prefix by '_'.
-Note that LUA require an initialisation value for every variables and declaring something like "local myvar" wont
-allocate "myvar"
-
-### Debugging Facilities
-
-Controler Lua script are check for syntax from CMAKE template with Luac. When needed to go further an developer API allow to
-execute directly Lua command within controller context from Rest/Ws (api=control, verb=lua_doscript). DoScript API takes two
-other optional arguments func=xxxx where xxxx is the function to execute within Lua script and args a JSON object to provide
-input parameter. When funcname is not given by default the controller try to execute middle filename doscript-xxxx-????.lua.
-
-When executed from controller Lua script may use any AppFw Apis as well as any L2C user defined commands in plugin.
-
-### Running as Standalone Controller
-
-Controller is a standard binding and can then be started independently of AAAA. When started with from build repository with
-```
-afb-daemon --port=1234 --workdir=. --roothttp=../htdocs --tracereq=common --token= --verbose --binding=./Controller-afb/afb-control-afb.so
-```
-
-Afb-Daemon only load controller bindings without search for the other binding. In this case the name of the process is not change
-to afb-audio and controller binding will search for a configuration file name 'onload-daemon-xxx.json'. This model can be used
-to implement for testing purpose or simply to act as the glue in between a UI and other binder/services.
-
-## Config Sample
-
-Here after a simple configuration sample.
-
-```
-{
- "$schema": "ToBeDone",
- "metadata": {
- "label": "sample-audio-control",
- "info": "Provide Default Audio Policy for Multimedia, Navigation and Emergency",
- "version": "1.0"
- },
- "onload": [{
- "label": "onload-default",
- "info": "onload initialisation config",
- "plugin": {
- "label" : "MyPlug",
- "sharelib": "ctl-audio-plugin-sample.ctlso",
- "lua2c": ["Lua2cHelloWorld1", "Lua2cHelloWorld2"]
- },
- "require": ["intel-hda", "jabra-usb", "scarlett-usb"],
- "actions": [
- {
- "label": "onload-sample-cb",
- "info": "Call control sharelib install entrypoint",
- "callback": "SamplePolicyInit",
- "args": {
- "arg1": "first_arg",
- "nextarg": "second arg value"
- }
- }, {
- "label": "onload-sample-api",
- "info": "Assert AlsaCore Presence",
- "api": "alsacore",
- "verb": "ping",
- "args": "test"
- }, {
- "label": "onload-hal-lua",
- "info": "Load avaliable HALs",
- "lua": "Audio_Init_Hal"
- }
- ]
- }],
- "controls":
- [
- {
- "label": "multimedia",
- "permissions": "urn:AGL:permission:audio:public:mutimedia",
- "actions": {
- "label": "multimedia-control-lua",
- "info": "Call Lua Script function Test_Lua_Engin",
- "lua": "Audio_Set_Multimedia"
- }
- }, {
- "label": "navigation",
- "permissions": "urn:AGL:permission:audio:public:navigation",
- "actions": {
- "label": "navigation-control-lua",
- "info": "Call Lua Script to set Navigation",
- "lua": "Audio_Set_Navigation"
- }
- }, {
- "label": "emergency",
- "permissions": "urn:AGL:permission:audio:public:emergency",
- "actions": {
- "label": "emergency-control-ucm",
- "lua": "Audio_Set_Emergency"
- }
- }, {
- "label": "multi-step-sample",
- "info" : "all actions must succeed for control to be accepted",
- "actions": [{
- "label": "multimedia-control-cb",
- "info": "Call Sharelib Sample Callback",
- "callback": "sampleControlNavigation",
- "args": {
- "arg1": "snoopy",
- "arg2": "toto"
- }
- }, {
- "label": "navigation-control-ucm",
- "api": "alsacore",
- "verb": "ping",
- "args": {
- "test": "navigation"
- }
- }, {
- "label": "navigation-control-lua",
- "info": "Call Lua Script to set Navigation",
- "lua": "Audio_Set_Navigation"
- }]
- }
- ],
- "events":
- [
- {
- "label": "Vehicle-Speed",
- "info": "Action when Vehicule speed change",
- "actions": [
- {
- "label": "speed-action-1",
- "callback": "Blink-when-over-130",
- "args": {
- "speed": 130
- "blink-speed": 1000
- }
- }, {
- "label": "Adjust-Volume",
- "lua": "Adjust_Volume_To_Speed",
- }
- ]
- },
- {
- "label": "Reverse-Engage",
- "info": "When Reverse Gear is Engage",
- "actions": [
- {
- "label": "Display-Rear-Camera",
- "callback": "Display-Rear-Camera",
- }, {
- "label": "Prevent-Phone-Call",
- "api" : "phone",
- "verb" : "status",
- "args": {
- "call-accepted": false
- }
- }
- ]
- },
- {
- "label": "Neutral-Engage",
- "info": "When Reverse Neutral is Engage",
- "actions": [
- {
- "label": "Authorize-Video",
- "api" : "video",
- "verb" : "status",
- "args": {
- "tv-accepted": true
- }
- }
- ]
- }
- ]
-}
-
-```
-