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<h1>Python</h1>
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<p>This section describes how to configure the Python environment to run experiments and
develop code for the ETSI TeraFlowSDN controller.
In particular, we use <a href="https://github.com/pyenv/pyenv">PyEnv</a> to install the appropriate
version of Python and manage the virtual environments.</p>
<h2 id="upgrade-the-ubuntu-distribution">Upgrade the Ubuntu distribution</h2>
<p>Skip this step if you already did it during the installation of your machine.</p>
<pre><code class="language-bash">sudo apt-get update -y
sudo apt-get dist-upgrade -y
</code></pre>
<h2 id="install-pyenv-dependencies">Install PyEnv dependencies</h2>
<pre><code class="language-bash">sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget \
curl llvm git libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev
</code></pre>
<h2 id="install-pyenv">Install PyEnv</h2>
<p>We recommend installing PyEnv through<br />
<a href="https://github.com/pyenv/pyenv-installer">PyEnv Installer</a>.
Below you can find the instructions, but we refer you to the link for updated
instructions.</p>
<pre><code class="language-bash">curl https://pyenv.run | bash
# When finished, edit ~/.bash_profile // ~/.profile // ~/.bashrc as the installer proposes.
# In general, it means to append the following lines to ~/.bashrc:
export PYENV_ROOT="$HOME/.pyenv"
command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"
</code></pre>
<p>In case .bashrc is not linked properly to your profile, you may need to append the
following line into your local .profile file:</p>
<pre><code class="language-bash"># Open ~/.profile and append this line:
+source "$HOME"/.bashrc
</code></pre>
<h2 id="restart-the-machine">Restart the machine</h2>
<p>Restart the machine for all the changes to take effect.</p>
<pre><code class="language-bash">sudo reboot
</code></pre>
<h2 id="install-python-39-over-pyenv">Install Python 3.9 over PyEnv</h2>
<p>ETSI TeraFlowSDN uses Python 3.9 by default.
You should install the latest stable update of Python 3.9, i.e., avoid "-dev" versions.
To find the latest version available in PyEnv, you can run the following command:</p>
<pre><code class="language-bash">pyenv install --list | grep " 3.9"
</code></pre>
<p>At the time of writing, this command will output the following list:</p>
<pre><code> 3.9.0
3.9-dev
3.9.1
3.9.2
3.9.4
3.9.5
3.9.6
3.9.7
3.9.8
3.9.9
3.9.10
3.9.11
3.9.12
3.9.13
3.9.14
3.9.15
3.9.16 ** always select the latest version **
</code></pre>
<p>Therefore, the latest stable version is Python 3.9.16.
To install this version, you should run:</p>
<pre><code class="language-bash">pyenv install 3.9.16
# This command might take some minutes depending on your Internet connection speed
# and the performance of your machine.
</code></pre>
<h2 id="create-the-virtual-environment-for-teraflowsdn">Create the Virtual Environment for TeraFlowSDN</h2>
<p>The following commands create a virtual environment named as <code>tfs</code> using Python 3.9 and
associate that environment with the current folder, i.e., <code>~/tfs-ctrl</code>.
That way, when you are in that folder, the associated virtual environment will be used,
thus inheriting the Python interpreter, i.e., Python 3.9, and the Python packages
installed on it.</p>
<pre><code class="language-bash">cd ~/tfs-ctrl
pyenv virtualenv 3.9.16 tfs
pyenv local 3.9.16/envs/tfs
</code></pre>
<p>After completing these commands, you should see in your prompt that now you're within
the virtual environment <code>3.9.16/envs/tfs</code> on folder <code>~/tfs-ctrl</code>:</p>
<pre><code>(3.9.16/envs/tfs) tfs@tfs-vm:~/tfs-ctrl$
</code></pre>
<p>In case that the correct pyenv does not get automatically activated when you change to
the tfs-ctrl/ folder, then execute the following command:</p>
<pre><code class="language-bash">cd ~/tfs-ctrl
pyenv activate 3.9.16/envs/tfs
</code></pre>
<h2 id="install-the-basic-python-packages-within-the-virtual-environment">Install the basic Python packages within the virtual environment</h2>
<p>From within the <code>3.9.16/envs/tfs</code> environment on folder <code>~/tfs-ctrl</code>, run the following
commands to install the basic Python packages required to work with TeraFlowSDN.</p>
<pre><code class="language-bash">cd ~/tfs-ctrl
./install_requirements.sh
</code></pre>
<p>Some dependencies require to re-load the session, so log-out and log-in again.</p>
<h2 id="generate-the-python-code-from-the-grpc-proto-messages-and-services">Generate the Python code from the gRPC Proto messages and services</h2>
<p>The components, e.g., microservices, of the TeraFlowSDN controller, in general, use a gRPC-based open API to interoperate.
All the protocol definitions can be found in sub-folder <code>proto</code> within the root project folder.
For additional details on gRPC, visit the official web-page <a href="https://grpc.io/">gRPC</a>.</p>
<p>In order to interact with the components, (re-)generate the Python code from gRPC definitions running the following command:</p>
<pre><code class="language-bash">cd ~/tfs-ctrl
proto/generate_code_python.sh
</code></pre>
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