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@@ -1,423 +1,11 @@ -# Controller +# App Controller -* Object: Generic Controller to handle Policy,Small Business Logic, Glue in between components, ... -* Status: Release Candidate -* Author: Fulup Ar Foll fulup@iot.bzh -* Date : May-2018 +Here you will find a guide on how to install, configure and use the controller. -## Features - -* Create a controller application from a JSON config file -* Each control (eg: navigation, multimedia, ...) is a suite of actions. When all actions succeed control is granted, if one fails control access is denied. -* Actions can either be: - * Invocation of an other binding API, either internal or external (eg: a policy service, Alsa UCM, ...) - * C routines from a user provided plugin (eg: policy routine, proprietary code, ...) - * Lua script function. Lua provides access to every AGL appfw functionality and can be extended by plugins written in C. - -## Installation - -* Controller can easily be included as a git submodule in any AGL service or application binder. -* Dependencies: the only dependencies are AGL application framework (https://gerrit.automotivelinux.org/gerrit/p/src/app-framework-binder.git) and app-afb-helpers-submodule (https://gerrit.automotivelinux.org/gerrit/p/apps/app-afb-helpers-submodule.git). -* Controller relies on Lua-5.3, when not needed Lua might be removed at compilation time. - -## Monitoring - -* The default test HTML page expect the monitoring HTML page to be accessible under /monitoring with the --monitoring option. -* The monitoring HTML pages are installed with the app framework binder in a subdirectory called monitoring. -* You can add other HTML pages with the alias options e.g. afb-daemon --port=1234 --monitoring --alias=/path1/to/htmlpages:/path2/to/htmlpages --ldpaths=. --workdir=. --roothttp=../htdocs -* The monitoring is accessible at http://localhost:1234/monitoring. - -## Controller binding configuration - -By default the controller searches for a config filename with the same 'middlename' as the daemon process. As an example if your process name is afb-daemon then middle name is 'daemon'. In addition, if your process name is afb-daemon-audio the middle name is also 'daemon'. Moreover the prefix is chosen when you call the [CtlConfigSearch](<#4)_Do_controller_config_parsing_at_binding_pre-init>) function, see below: - -```bash -CtlConfigSearch(AFB_ApiT apiHandle, const char *dirList, const char *prefix) -``` - -```bash -# Middlename is taken from process middlename. -(prefix-)middlename*.json -``` - -You may overload the config search path with environment variables - -* **CONTROL_CONFIG_PATH**: change default reserch path for configuration. You may provide multiple directories separated by ':'. -* **CONTROL_LUA_PATH**: same as CONTROL_CONFIG_PATH but for Lua script files. - -Example: to load a config named '(prefix-)myconfig-test.json' do - -```bash -afb-daemon --name myconfig --verbose ...' -``` - -The configuration is loaded dynamically during startup time. The controller scans **CONTROL_CONFIG_PATH** for a file corresponding to the pattern -"(prefix-)bindermiddlename*.json". The first file found in the path is loaded, -any other file corresponding to the same path is ignored and only generates a warning. - -Each block in the configuration file is defined with - -* **uid**: mandatory, it is used either for debugging or as input for the action (eg: signal name, control name, ...) -* **info**: optional, it is used for documentation purpose only - -> **Note**: by default the controller config search path is defined at compilation time, but the path might be overloaded with the **CONTROL_CONFIG_PATH** -> environment variable. - -### Config is organised in sections - -* **metadata**: describes the configuration -* **plugins or resources**: defines the set of functions provided by the plugins allowing to load additionnal resources (compiled C or lua) -* **onload**: a collection of actions meant to be executed at startup time -* **control**: sets the controls with a collection of actions, in dynamic api it could also specify the verbs of the api -* **event**: a collection of actions meant to be executed when receiving a given signal -* **personnal sections**: personnal section - -Callbacks to parse sections are documented in [Declare your controller config section in your binding](<#3_Declare_your_controller_config_section_in_your_binding>) section. You can use the callback defined in controller or define your own callback. - -### Metadata - -As today matadata is only used for documentation purpose. - -* **uid**: mandatory -* **version**: mandatory -* **api**: mandatory -* **info**: optional -* **require**: optional -* **author**: optional -* **date**: optional - -### OnLoad section - -Onload section defines startup time configuration. Onload may provide multiple initialisation -profiles, each with a different uid. - -You can define the following keys or arrays of the following keys: - -* **uid**: mandatory. -* **info**: optional -* **action**: mandatory -* **args**: optionnal - -### Control section - -Control section defines a list of controls that are accessible. - -You can define the following keys or arrays of the following keys, moreover -this section could be verb api: - -* **uid**: mandatory -* **info**: optional -* **action**: the list of actions is mandatory - -### Event section - -Event section defines a list of actions to be executed on event reception. Event can do -anything a controller can (change state, send back signal, ...) -eg: if a controller subscribes to vehicle speed, then speed-event may adjust -master-volume to speed. - -You can define the following keys or arrays of the following keys, moreover you can define an event from an another API with the following syntax "API/event". - -* **uid**: mandatory -* **info**: optional -* **action**: the list of actions is mandatory - -### Plugin section - -Plugin section defines plugins used with this controller. A plugin is a C/C++ program meant to -execute some tasks after an event or on demand. This easily extends intrinsec -binding logic for ad-hoc needs. - -You can define the following keys or arrays of the following keys: - -* **uid**: mandatory -* **info**: optionnal -* **spath**: optionnal, semicolon separated paths where to find the plugin. This could be a compiled shared library or LUA scripts. Could be specified using CONTROL_PLUGIN_PATH environment variable also. -* **libs**: mandatory, Plugin file or LUA scripts to load -* **lua**: optionnal, C functions that could be called from a LUA script - -### Personnal sections - -* **uid**: mandatory -* **info**: optionnal -* **action**: mandatory -* **any keys wanted**: optionnal - -You can define your own sections and add your own callbacks into the -CtlSectionT structure, see -[Declare your controller config section in your binding](<#3_Declare_your_controller_config_section_in_your_binding>) section. - -### Actions Categories - -Controller supports three categories of actions. Each action returns a status -where 0=success and 1=failure. - -* **AppFw API** provides a generic model to request other bindings. Requested bindings can be local (eg: ALSA/UCM) or external (eg: vehicle signalling). - * `"action": "api://API_NAME#verb_name"` -* C-API, when defined in the onload section, the plugin may provide C native API with `CTLP-CAPI(apiname, uid, args, query, context)`. Plugin may also create Lua command with `CTLP-LUA2C(LuaFuncName, uid, args, query, context)`. Where `args`+`query` are JSON-C object and context is the returned value from `CTLP_ONLOAD` function. Any missing value is set to NULL. - * `"action": "plugin://plugin_name#function_name"` -* Lua-API, when compiled with Lua option, the controller supports action defined directly in Lua script. During "*onload*" phase, the controller searches in `CONTROL_LUA_PATH` file with pattern "(prefix-)bindermiddlename*.lua". Any file corresponding to this pattern is automatically loaded. Any function defined in those Lua scripts can be called through a controller action. Lua functions receive three parameters (uid, args, query). - * `"action": "lua://plugin_name#function_name"` - -You also can add the **privileges** property that handles AGL permission -needed to be able to call this action. - -> **Note**: Lua added functions are systematically prefixed. AGL standard AppFw -functions are prefixed with AGL: (eg: AFB:notice(), AFB:success(), ...). -> User Lua functions added through the plugin and CTLP_LUA2C are prefixed with -the plugin uid or the one you defined in your config (eg: MyPlug:HelloWorld1). - -### Available Application Framework Commands - -Each Lua AppFw commands should be prefixed by AFB: - -* `AFB:notice ("format", arg1,... argn)` directly printed LUA tables as json string with '%s'. - `AFB:error`, `AFB:warning`, `AFB:info`, `AFB:debug` work on the same model. Printed messages are limited to 512 characters. - -* `AFB:service ('API', 'VERB', {query}, "Lua_Callback_Name", {context})` is an asynchronous call to another binding. When empty, query/context should be set to '{}' - and not to 'nil'. When 'nil', Lua does not send 'NULL' value but removes 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 the response) - * context is a copy of the Lua table pass as an argument (warning it's a copy not a pointer to original table) - -* `error,result=AFB:servsync('API', 'VERB', {query})` is saved as previous but for synchronous call. Note that Lua accepts multiple - returns. AFB:servsync returns both the error message and the response as a Lua table. Like for AFB:service, the user should not - forget to extract response from result. - -* `AFB:success(request, response)` is the success request. request is the opaque handle passes when Lua is called from (api="control", verb="docall"). - Response is a Lua table that will be returned to the client. - -* `AFB:fail(request, response)` is the same as for success. Note that LUA generates automatically the error code from Lua function name. - The response is transformed into a json string before being returned to the client. - -* `EventHandle=AFB:evtmake("MyEventName")` creates an event and returns the handle as an opaque handle. Note that due to a limitation - of json_object, this opaque handle cannot be passed as an argument in a callback context. - -* `AFB:subscribe(request, MyEventHandle)` subscribes a given client to a previously created event. - -* `AFB:evtpush (MyEventHandle, MyEventData)` pushes an event to every subscribed client. MyEventData is a Lua table that will be - sent as a json object to the corresponding clients. - -* `timerHandle=AFB:timerset (MyTimer, "Timer_Test_CB", context)` initialises a timer from MyTimer Lua table. This table should contains 3 elements: - MyTimer={[l"abel"]="MyTimerName", ["delay"]=timeoutInMs, ["count"]=nBOfCycles}. Note that if count==0 then timer is cycled - infinitely. Context is a standard Lua table. This function returns an opaque handle to be used to further control the timer. - -* `AFB:timerclear(timerHandle)` kills an existing timer. Returns an error when timer does not exit. - -* `MyTimer=AFB:timerget(timerHandle)` returns uid, delay and count of an active timer. Returns an error when timerHandle does not - point on an active timer. - -* `AFB:GetEventLoop()` retrieves the common systemd's event loop of AFB. - -* `AFB:RootDirGetFD()` gets the root directory file descriptor. This file descriptor can be used with functions 'openat', 'fstatat', ... - -> **Note**: Except for functions call during binding initialisation period. Lua calls are protected and should returned clean messages -> even when they are 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 a set of Lua commands usable inside any script (onload, control,event). A simple -plugin that provides both notice 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 declared with `CTLP_REGISTER("MyCtlSamplePlugin")`. This entry point defines a special structure that is checked -at plugin load time by the controller. Then you have an optional init routine declare with `CTLP_ONLOAD(plugin, handle)`. - The init routine may create -a plugin context that is later presented to every plugin API, this for both LUA and native C ones. Then each: - -* C API declare with `CTLP_CAPI(MyCFunction, source, argsJ, queryJ) {your code}`. Where: - * **MyFunction** is your function - * **source** is the structure config - * **argsJ** a json_object containing the argument attaches to this control in JSON config file - * **queryJ** a json_object - -* Lua API declare with `CTLP_LUA2C(MyLuaCFunction, source, argsJ, responseJ) {your code}`. Where - * **MyLuaCFunction** is both the name of your C function and Lua command - * **source** is the structure config - * **argsJ** the arguments passed this time from Lua script and not from Json config file. - * **responseJ** if success the argument is passed into the request. - -> **Warning**: Lua samples use with controller enforce strict mode. As a result every variable should be declared 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 prefixed by '_'. -> Note that LUA requires an initialisation value for every variables and declaring something like "local myvar" will not -> allocate "myvar". - -### Debugging Facilities - -Controller Lua scripts are checked for syntax from CMAKE template with Luac. When needed to go further, a developer API should be allowed to -execute directly Lua commands within the 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 parameters. When funcname is not given by default, the controller tries to execute middle filename doscript-xxxx-????.lua. - -When executed from the controller, Lua script may use any AppFw Apis as well as any L2C user defines commands in plugin. - -### Running as Standalone Controller - -The controller is a standard binding. It can be started with the following command: +To generate the doc enter: ```bash -afb-daemon --name=yourname --port=1234 --workdir=. --roothttp=./htdocs --tracereq=common --token= --verbose --binding=pathtoyourbinding.so --monitoring -``` - -Afb-Daemon only loads controller bindings without searching for the other -binding. In this case, the controller binding will search for a configuration file -name '(prefix-)bindermiddlename*.json'. This model can be used to implement for testing -purpose or simply to act as the glue between a UI and other binder/services. - -## Usage - -### 1) Add app-controller-submodule as a submodule to include in your project - -```bash -git submodule add https://gerrit.automotivelinux.org/gerrit/apps/app-controller-submodule -``` - -### 2) Add app-controller-submodule as a static library to your binding - -```cmake - # Library dependencies (include updates automatically) - TARGET_LINK_LIBRARIES(${TARGET_NAME} - ctl-utilities - ... other dependencies .... - ) -``` - -### 3) Declare your controller config section in your binding - -```C -// CtlSectionT syntax: -// key: "section name in config file" -// loadCB: callback to process section -// handle: a void* pass to callback when processing section -static CtlSectionT ctlSections[]= { - {.key="plugins" , .loadCB= PluginConfig, .handle= &halCallbacks}, - {.key="onload" , .loadCB= OnloadConfig}, - {.key="halmap" , .loadCB= MapConfigLoad}, - {.key=NULL} -}; - -``` - -### 4) Do the controller config parsing at binding pre-init - -```C - // check if config file exist - const char *dirList= getenv("CTL_CONFIG_PATH"); - if (!dirList) dirList=CONTROL_CONFIG_PATH; - - const char *configPath = CtlConfigSearch(apiHandle, dirList, "prefix"); - if(!confiPath) return -1; - - ctlConfig = CtlConfigLoad(dirList, ctlSections); - if (!ctlConfig) return -1; +./gendocs.sh pdf ``` -### 5) Execute the controller config during binding init - -```C - int err = CtlConfigExec (ctlConfig); -``` - -## Config Sample - -Here after a simple configuration sample. - -```json -{ - "$schema": "http://iot.bzh/download/public/schema/json/ctl-schema.json", - "metadata": { - "uid": "sample-audio-control", - "api": "audio-control", - "info": "Provide Default Audio Policy for Multimedia, Navigation and Emergency", - "version": "1.0", - "require": ["intel-hda", "jabra-usb", "scarlett-usb"] - }, - "plugins": { - "uid" : "MyPlug", - "spath":"./plugins/pluginname:../conf.d/project/lua.d", - "libs": ["ctl-audio-plugin-sample.ctlso", "softmixer-simple.lua"], - "lua": ["Lua2cHelloWorld1", "Lua2cHelloWorld2"] - }, - "onload": [{ - "uid": "onload-sample-cb", - "info": "Call control sharelib install entrypoint", - "action": "lua://MyPlug#SamplePolicyInit", - "args": { - "arg1": "first_arg", - "nextarg": "second arg value" - } - }, { - "uid": "onload-sample-api", - "info": "Assert AlsaCore Presence", - "action": "api://alsacore#ping", - "args": { - "test": "onload-sample-api" - } - } - ], - "controls":[{ - "uid": "multimedia", - "privileges": "urn:AGL:permission:audio:public:mutimedia", - "action": "lua://MyPlug#Audio_Set_Multimedia" - }, { - "uid": "navigation", - "privileges": "urn:AGL:permission:audio:public:navigation", - "action": "lua://MyPlug#Audio_Set_Navigation" - }, { - "uid": "emergency", - "privileges": "urn:AGL:permission:audio:public:emergency", - "action": "lua://MyPlug#Audio_Set_Emergency" - }, { - "uid": "multimedia-control-cb", - "info": "Call Sharelib Sample Callback", - "action": "plugin://MyPlug#sampleControlNavigation", - "args": { - "arg1": "snoopy", - "arg2": "toto" - } - }, { - "uid": "navigation-control-ucm", - "action": "api://alsacore#ping", - "args": { - "test": "navigation" - } - }, { - "uid": "navigation-control-lua", - "info": "Call Lua Script to set Navigation", - "action": "lua://MyPlug#Audio_Set_Navigation" - } - ], - "events":[{ - "uid": "speed-action-1", - "action": "plugin://MyPlug#Blink-when-over-130", - "args": { - "speed": 130, - "blink-speed": 1000 - } - }, { - "uid": "Adjust-Volume", - "action": "lua://MyPlug#Adjust_Volume_To_Speed" - }, { - "uid": "Display-Rear-Camera", - "action": "plugin://MyPlug#Display-Rear-Camera" - }, { - "uid": "Prevent-Phone-Call", - "action": "api://phone#status", - "args": { - "call-accepted": "false" - } - }, { - "uid": "Authorize-Video", - "action": "api://video#status", - "args": { - "tv-accepted": "true" - } - } - ] -} -``` + to generate it in pdf version, or change *pdf* to *serve* to have it as a web site.
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