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BYOR: Setup Python Runtime for XSA – by the SAP HANA Academy

Introduction

Last summer, Muhammad Altaf posted Getting Started with Python on SAP HANA XSA showing the steps how to install/create the Python runtime for SAP HANA XS advanced model. Judging by the number of views, this topic is of interest for the HANA development community.

Hence, “to enhance your learning experience”, we have created a tutorial video where you can see this in action using two sample code scripts.

Tutorial Video

In the video tutorial, we show how you –using SAP HANA, express edition running in Google Cloud, as example — how to prepare the OS environment, how to build Python and create the runtime. A simple test script generates a sample app to validate all is well in the best possible worlds.

URL: https://youtu.be/5Wm_0b73NJY

Code Samples

For the sample code, see the GitHub repository:

 

Code Walktru

The code sample below shows how to clone the repository to your HANA development system.

sudo -i
su - hxeadm
cd $HOME
git clone https://github.com/saphanaacademy/python
cd python
chmod u+x *.sh
./create-python-runtime.sh
./test-python-runtime.sh

Operating System Preparation

Every carpenter knows; before you can build, you need tools. An SAP HANA system, as an appliance, in express edition format, or when hardened, does not include any build tools. Not needed, overhead, potentially insecure. To build Python runtimes, you will first need to add the required packages to your system.

The SAP HANA Developer Guide documents the following packages as requirements:

zypper install tk-devel tcl-devel libffi-devel \
 openssl-devel readline-devel sqlite3-devel \
 ncurses-devel xz-devel zlib-devel

Should you still have issues with building, on a development system, consider to install the Basis-Devel pattern.

zypper search -t pattern
zypper in -t pattern Basis-Devel

If you prefer, you can use YaST2.

Create Runtime

You can download the Python source code from https://www.python.org/downloads/source/

The create runtime script downloads the version, configures, makes and altinstalls. The version is taken as input. We run altinstall because we do not want to update either the Linux Python release or the HANA Python version,

Note that the path here is a hardcoded HXE. If you are not using the express edition, change the path to the SID.

cd ~ ; mkdir -p builds source Downloads
wget -P ~/Downloads \
 -N https://www.python.org/ftp/python/$1/Python-$1$2.tgz
tar xzvf ~/Downloads/Python-$1$2.tgz -C ~/source
cd ~/source/Python-$1$2
./configure \
--prefix=/usr/sap/HXE/home/builds/Python-$1$2 \
--exec-prefix=/usr/sap/HXE/home/builds/Python-$1$2 \
--enable-optimizations
make altinstall clean
xs create-runtime -p ~/builds/Python-$1$2
xs runtimes

Testing, Testing, 1,2,3

The test script generates the required files for a simple Hello World python script:

  • runtime.txt
  • requirements.txt
  • manifest.yaml
  • server.py
# create server.py 
cat > server.py << EOF
import os
from flask import Flask
app = Flask(__name__)
port = int(os.environ.get('PORT', 3000))
@app.route('/')
def hello():
    return "Hello World from Python $1"
if __name__ == '__main__':
    app.run(port=port)
EOF

To upload the app, we switch to the development space and push (upload) the app to the runtime. For housekeeping, we delete the app first (if present).

Note that “development” is one of the spaces available out-of-the-box with SAP HANA, express edition. If you are working on a regular platform edition, you might need to change the name otherwise xs push will default to the ‘SAP’ space (not recommended).

xs target -s development
xs delete -f pyapp
xs push

YouTube Playlist(s)

The tutorials has been posted to the following playlists:

References

For the documentation, see

Thank you for watching

The SAP HANA Academy provides free online video tutorials for the developers, consultants, partners and customers of SAP HANA.

Topics range from practical how-to instructions on administration, data loading and modeling, and integration with other SAP solutions, to more conceptual projects to help build out new solutions using mobile applications or predictive analysis.

For the full library, see SAP HANA Academy Library – by the SAP HANA Academy.

For the full list of blogs, see Blog Posts – by the SAP HANA Academy.

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