AGL Framework Binder

This project provides the binder component of the the microservice architecture of Automotive Grade Linux (AGL).

This project is available there https://git.automotivelinux.org/src/app-framework-binder/

It can be cloned with git clone https://git.automotivelinux.org/src/app-framework-binder.

License and copying

This software is an open source software funded by LinuxFoundation and Renesas.

This software is delivered under the terms of the open source license Apache 2.

This license is available in the file LICENSE-2.0.txt or on the worl wide web at the location https://opensource.org/licenses/Apache-2.0

Building

Requirements

Building the AGL framework binder has been tested under Ubuntu, Debian and Fedora 26 with gcc 6 and 7.

It requires the following libraries:

• libmagic ("libmagic-dev" under Ubuntu, "file-devel" under Fedora);
• libmicrohttpd >= 0.9.55 (fetch and build from "http://ftp.gnu.org/gnu/libmicrohttpd");
• json-c ("libjson-c-dev/devel");
• uuid ("uuid-dev/libuuid-devel");
• openssl ("libssl-dev/openssl-devel");
• systemd >= 222 ("libsystemd-dev/systemd-devel");

The following library can be used for checking permissions:

• cynara (https://github.com/Samsung/cynara)

and the following tools:

• gcc;
• pkg-config;
• cmake >= 3.0

To install all dependencies under Ubuntu (excepting libmicrohttpd), please type:

$ apt-get install libmagic-dev libjson-c-dev uuid-dev libsystemd-dev libssl-dev gcc make pkg-config cmake

or under Fedora (excepting libmicrohttpd and rtl-sdr):

$ dnf install git passwd iproute openssh-server openssh-client
$ dnf install file-devel gcc gdb make pkgconfig cmake
$ dnf install json-c-devel libuuid-devel systemd-devel openssl-devel

Simple compilation

The following commands will install the binder in your subdirectory $HOME/local (instead of /usr/local the default when CMAKE_INSTALL_PREFIX isn't set).

$ git clone https://git.automotivelinux.org/src/app-framework-binder
$ cd app-framework-binder
$ mkdir build
$ cd build
$ cmake -DCMAKE_INSTALL_PREFIX=$HOME/local ..
$ make install

Advanced compilation

You can tune options when calling cmake. Here are the known options with their default values.

$ git clone https://git.automotivelinux.org/src/app-framework-binder
$ cd app-framework-binder
$ mkdir build
$ cd build
$ cmake \
      -DCMAKE_INSTALL_PREFIX=/usr/local  \
      -DAGL_DEVEL=OFF                    \
      -DINCLUDE_MONITORING=OFF           \
      -DINCLUDE_SUPERVISOR=OFF           \
      -DINCLUDE_DBUS_TRANSPARENCY=OFF    \
      -DINCLUDE_LEGACY_BINDING_V1=OFF    \
      -DINCLUDE_LEGACY_BINDING_VDYN=OFF  \
      -DAFS_SUPERVISOR_PORT=1619         \
      -DAFS_SUPERVISOR_TOKEN="HELLO"     \
      -DAFS_SUPERVISION_SOCKET="@urn:AGL:afs:supervision:socket" \
      -DUNITDIR_SYSTEM=${CMAKE_INSTALL_LIBDIR}/systemd/system    \
    ..
$ make install

The configuration options are:

** TO BE COMPLETED **

Simple demo

Testing/Debug

$ ${AFB_DAEMON_DIR}/build/src/afb-daemon --help
$ ${AFB_DAEMON_DIR}/build/src/afb-daemon --port=1234 --token='' --ldpaths=${AFB_DAEMON_DIR}/build --sessiondir=/tmp --rootdir=${AFB_DAEMON_DIR}/test

Starting

$ afb-daemon --help
$ afb-daemon --verbose --port=<port> --token='' --sessiondir=<working directory> --rootdir=<web directory (index.html)>

Example

$ afb-daemon --verbose --port=1234 --token='' --sessiondir=/tmp --rootdir=/srv/www/htdocs --alias=icons:/usr/share/icons

Directories & Paths

Default behaviour is to locate ROOTDIR in $HOME/.AFB

REST API

Developers are intended to provide a structure containing : API name, corresponding methods/callbacks, and optionally a context and a handle. A handle is a void* structure automatically passed to API callbacks. Callbacks also receive HTTP GET data as well as HTTP POST data, in case a POST method was used. Every method should return a JSON object or NULL in case of error.

API plugins can be protected from timeout and other errors. By default this behaviour is deactivated, use --apitimeout to activate it.

    STATIC AFB_restapi myApis[]= {
      {"ping"    , AFB_SESSION_NONE,  (AFB_apiCB)ping,     "Ping Function"},
      {"action1" , AFB_SESSION_CHECK, (AFB_apiCB)action1 , "Action-1"},
      {"action2" , AFB_SESSION_CHECK, (AFB_apiCB)action2 , "Action-2"},
      {NULL}
    };

    PUBLIC AFB_plugin *pluginRegister () {
        AFB_plugin *plugin = malloc (sizeof (AFB_plugin));
        plugin->type  = AFB_PLUGIN_JSON;
        plugin->info  = "Plugin Sample";
        plugin->prefix= "myPlugin";
        plugin->apis  = myApis;
        return (plugin);
    }

HTML5 and AngularJS Redirects

Binder supports HTML5 redirect mode even with an application baseurl. Default value for application base URL is /opa. See Application Framework HTML5 Client template at https://github.com/iotbzh/afb-client-sample

If the Binder receives something like http://myopa/sample when sample is not the homepage of the AngularJS OPA, it will redirect to http://myopa/#!sample. This redirect will return the index.html OPA file and will notify AngularJS not to display the homepage, but the sample page.

Warning: in order for AngularJS applications to be able to work with both BASEURL="/" and BASEURL="/MyApp/", all page references have to be relative.

Recommended model is to develop with a BASEURL="/opa" as any application working with a BASEURL will work without, while the opposite is not true.

Note: If a resource is not accessible from ROOTDIR then the "--alias" switch should be used, as in: --alias=/icons:/usr/share/icons. Only use alias for external support static files. This should not be used for API and OPA.

Ongoing work

Javascript plugins. As of today, only C plugins are supported, but JS plugins are on the TODO list.