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### **2.1.1. Python**
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This section describes how to configure the Python environment to run experiments and
develop code for the ETSI TeraFlowSDN controller.
In particular, we use [PyEnv](https://github.com/pyenv/pyenv) to install the appropriate
version of Python and manage the virtual environments.
<h3><u>Upgrade the Ubuntu distribution</h3></u>
Skip this step if you already did it during the installation of your machine.
```bash
sudo apt-get update -y
sudo apt-get dist-upgrade -y
```
<h3><u>Install PyEnv dependencies</h3></u>
```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
```
<h3><u>Install PyEnv</h3></u>
We recommend installing PyEnv through
[PyEnv Installer](https://github.com/pyenv/pyenv-installer).
Below you can find the instructions, but we refer you to the link for updated
instructions.
```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 "$(pyenv virtualenv-init -)"
```
In case .bashrc is not linked properly to your profile, you may need to append the
following line into your local .profile file:
```bash
# Open ~/.profile and append this line:
+source "$HOME"/.bashrc
```
<h3><u>Restart the machine</h3></u>
Restart the machine for all the changes to take effect.
```bash
sudo reboot
```
<h3><u>Install Python 3.9 over PyEnv</h3></u>
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:
```bash
pyenv install --list | grep " 3.9"
```
At the time of writing, this command will output the following list:
```
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 **
```
Therefore, the latest stable version is Python 3.9.16.
To install this version, you should run:
```bash
pyenv install 3.9.16
# This command might take some minutes depending on your Internet connection speed
# and the performance of your machine.
```
<h3><u>Create the Virtual Environment for TeraFlowSDN</h3></u>
The following commands create a virtual environment named as `tfs` using Python 3.9 and
associate that environment with the current folder, i.e., `~/tfs-ctrl`.
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.
```bash
cd ~/tfs-ctrl
pyenv virtualenv 3.9.16 tfs
pyenv local 3.9.16/envs/tfs
```
After completing these commands, you should see in your prompt that now you're within
the virtual environment `3.9.16/envs/tfs` on folder `~/tfs-ctrl`:
```
(3.9.16/envs/tfs) tfs@tfs-vm:~/tfs-ctrl$
```
In case that the correct pyenv does not get automatically activated when you change to
the tfs-ctrl/ folder, then execute the following command:
```bash
cd ~/tfs-ctrl
pyenv activate 3.9.16/envs/tfs
```
<h3><u>Install the basic Python packages within the virtual environment</h3></u>
From within the `3.9.16/envs/tfs` environment on folder `~/tfs-ctrl`, run the following
commands to install the basic Python packages required to work with TeraFlowSDN.
```bash
cd ~/tfs-ctrl
./install_requirements.sh
```
Some dependencies require to re-load the session, so log-out and log-in again.
<h3><u>Generate the Python code from the gRPC Proto messages and services</h3></u>
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 `proto` within the root project folder.
For additional details on gRPC, visit the official web-page [gRPC](https://grpc.io/).
In order to interact with the components, (re-)generate the Python code from gRPC definitions running the following command:
```bash
cd ~/tfs-ctrl
proto/generate_code_python.sh
```
### **2.1.2. Java (Quarkus)**
### **2.1.3. Java (Maven)**
### **2.1.5. Erlang**
### **2.1.6. Kotlin**
## **2.2. Configure VScode**
## **2.3. Develop A Component (WIP)**