=====
Usage
=====

SimpleBluez should work on any Linux environment supporting DBus and Bluez.
Please follow the instructions below to build and run SimpleBluez in your specific environment.

System Requirements
===================

When building SimpleBluez from source, you will need some dependencies based on your
current operating system.

General Requirements
--------------------

   - `CMake`_ (Version 3.21 or higher)

Linux
-----

APT-based Distros
~~~~~~~~~~~~~~~~~

   - `libdbus-1-dev` (install via ``sudo apt install libdbus-1-dev``)

RPM-based Distros
~~~~~~~~~~~~~~~~~

   - `dbus-devel`
      - On Fedora, install via ``sudo dnf install dbus-devel``
      - On CentOS, install via ``sudo yum install dbus-devel``


Building and Installing the Library (Source)
============================================

Compiling the library is done using `CMake`_ and relies heavily on plenty of CMake
functionality. It is strongly suggested that you get familiarized with CMake before
blindly following the instructions below.


Building SimpleBluez
--------------------

You can use the following commands to build SimpleBluez: ::

   cmake -H <path-to-simplebluez> -B build_simplebluez
   cmake --build build_simplebluez -j7

Note that if you want to modify the build configuration, you can do so by passing
additional arguments to the ``cmake`` command. For example, to build a shared library
set the ``BUILD_SHARED_LIBS`` CMake variable to ``TRUE`` ::

   cmake -H <path-to-simplebluez> -B build_simplebluez -DBUILD_SHARED_LIBS=TRUE

To modify the log level, set the ``SIMPLEBLUEZ_LOG_LEVEL`` CMake variable to one of the
following values: ``VERBOSE``, ``DEBUG``, ``INFO``, ``WARN``, ``ERROR``, ``FATAL`` ::

   cmake -H <path-to-simplebluez> -B build_simplebluez -DSIMPLEBLUEZ_LOG_LEVEL=DEBUG

To force the usage of the DBus session bus, enable the ``SIMPLEBLUEZ_USE_SESSION_DBUS`` flag ::

   cmake -H <path-to-simplebluez> -B build_simplebluez -DSIMPLEBLUEZ_USE_SESSION_DBUS=TRUE

Installing SimpleBluez
----------------------

To install SimpleBluez, you can use the following commands: ::

   cmake --install build_simplebluez

Note that if you want to modify the installation configuration, you can do so by passing
additional arguments to the ``cmake`` command. For example, to install the library to
a specific location, set the ``CMAKE_INSTALL_PREFIX`` CMake variable to the desired
location ::

   cmake --install build_simplebluez --prefix /usr/local

Note that on Linux and MacOS, you will need to run the ``cmake --install`` command
with ``sudo`` privileges. ::

   sudo cmake --install build_simplebluez


Usage with CMake (Installed)
============================

Once SimpleBluez has been installed, it can be consumed from within CMake::

   find_package(simplebluez REQUIRED CONFIG)
   target_link_libraries(<your-target> simplebluez::simplebluez)


Usage with CMake (Local)
=============================

You can add the ``simplebluez`` library directory into your project and include it in
your ``CMakeLists.txt`` file ::

   add_subdirectory(<path-to-simplebluez> ${CMAKE_BINARY_DIR}/simplebluez)
   target_link_libraries(<your-target> simplebluez::simplebluez)


Usage with CMake (Vendorized)
=============================

If you want to use a vendorized copy of SimpleBluez, you can do so by using FetchContent
and specifying the location from where SimpleBluez should be consumed from. ::

   include(FetchContent)
   FetchContent_Declare(
       simplebluez
       GIT_REPOSITORY <simplebluez-git-repository>
       GIT_TAG <simplebluez-git-tag>
       GIT_SHALLOW YES
   )

   # Note that here we manually do what FetchContent_MakeAvailable() would do,
   # except to ensure that the dependency can also get what it needs, we add
   # custom logic between the FetchContent_Populate() and add_subdirectory()
   # calls.
   FetchContent_GetProperties(simplebluez)
   if(NOT simplebluez_POPULATED)
       FetchContent_Populate(simplebluez)
       list(APPEND CMAKE_MODULE_PATH "${simplebluez_SOURCE_DIR}/cmake/find")
       add_subdirectory("${simplebluez_SOURCE_DIR}/simplebluez" "${simplebluez_BINARY_DIR}")
   endif()

   set(simplebluez_FOUND 1)

You can put this code inside ``Findsimplebluez.cmake`` and add it to your CMake
module path, as depicted in `cmake-init-fetchcontent`_.

Once vendorized using the above approach, you can consume SimpleBluez from
within CMake as you'd normally do ::

   find_package(simplebluez REQUIRED)
   target_link_libraries(<your-target> simplebluez::simplebluez)

One key security feature of SimpleBluez is that it allows the user to specify
the URLs and tags of all internal dependencies, thus allowing compilation
from internal or secure sources without the risk of those getting compromised.

Currently, the following libraries are included as part of SimpleBluez, with
the following CMake options available:

- `fmtlib`_

  - ``LIBFMT_VENDORIZE``: Enable vendorization of fmtlib. *(Default: True)*

  - ``LIBFMT_GIT_REPOSITORY``: The git repository to use for fmtlib.

  - ``LIBFMT_GIT_TAG``: The git tag to use for fmtlib. *(Default: v8.1.1)*

  - ``LIBFMT_LOCAL_PATH``: The local path to use for fmtlib. *(Default: None)*


Build Examples
==============

Use the following instructions to build the provided SimpleBluez examples: ::

   cmake -H <path-to-simplebluez>/examples/simplebluez -B build_simplebluez_examples -DSIMPLEBLUEZ_LOCAL=ON
   cmake --build build_simplebluez_examples -j7


Testing
=======

To build and run unit and integration tests, the following packages are
required: ::

   sudo apt install libgtest-dev libgmock-dev python3-dev
   pip3 install -r <path-to-simplebluez>/test/requirements.txt


Unit Tests
----------

To run the unit tests, run the following command: ::

   cmake -H <path-to-simplebluez> -B build_simplebluez_test -DSIMPLEBLUEZ_TEST=ON
   cmake --build build_simplebluez_test -j7
   ./build_simplebluez_test/bin/simplebluez_test


Address Sanitizer Tests
-----------------------

To run the address sanitizer tests, run the following command: ::

   cmake -H <path-to-simplebluez> -B build_simplebluez_test -DSIMPLEBLUEZ_SANITIZE=Address -DSIMPLEBLUEZ_TEST=ON
   cmake --build build_simplebluez_test -j7
   PYTHONMALLOC=malloc ./build_simplebluez_test/bin/simplebluez_test

It's important for ``PYTHONMALLOC`` to be set to ``malloc``, otherwise the tests will
fail due to Python's memory allocator from triggering false positives.


Thread Sanitizer Tests
----------------------

To run the thread sanitizer tests, run the following command: ::

   cmake -H <path-to-simplebluez> -B build_simplebluez_test -DSIMPLEBLUEZ_SANITIZE=Thread -DSIMPLEBLUEZ_TEST=ON
   cmake --build build_simplebluez_test -j7
   ./build_simplebluez_test/bin/simplebluez_test


.. Links

.. _cmake-init-fetchcontent: https://github.com/friendlyanon/cmake-init-fetchcontent

.. _fmtlib: https://github.com/fmtlib/fmt