reana-workflow-sin-plot

name	reana-workflow-sin-plot
version	1.0
description	Automates creation, submission, monitoring, and retrieval of a REANA workflow that plots a green sine curve using pandas and matplotlib.
author	Hermes

When to Use

Automates creation, submission, monitoring, and retrieval of a REANA workflow that plots a green sine curve using pandas and matplotlib.

Overview

This skill automates the full REANA workflow lifecycle for generating a green sine‑wave plot using pandas and matplotlib.

Prerequisites

• REANA server URL (default https://reana.cern.ch).
• REANA access token with workflow-create, workflow-start, workflow-getoutput, and workflow-status scopes.
• Python 3 on the host machine.

Steps

1. (Optional) Isolate the REANA client

   python3 -m venv ~/reana_venv
   source ~/reana_venv/bin/activate
   pip install --upgrade pip
   pip install reana-client
   

2. Create workflow directory

   mkdir -p ~/reana_sin_workflow && cd ~/reana_sin_workflow
   

3. Write reana.yaml

   name: sin-plot
   description: Plot a sine curve in green using pandas & matplotlib.
   environment:
     image: gitlab-p4n.aip.de:5005/p4nreana/reana-env:py311-astro.9845
   commands:
     - python plot_sin.py
   

4. Write plot_sin.py

   import numpy as np, pandas as pd, matplotlib.pyplot as plt
   x = np.linspace(0, 2*np.pi, 200)
   y = np.sin(x)
   df = pd.DataFrame({'x': x, 'sin(x)': y})
   ax = df.plot(x='x', y='sin(x)', color='green', legend=False)
   ax.set_xlabel('x')
   ax.set_ylabel('sin(x)')
   ax.set_title('Sine wave (green)')
   plt.tight_layout()
   plt.savefig('sin_plot.png')
   plt.close()
   

5. (Optional) requirements.txt – needed only when building a custom image.

   pandas
   matplotlib
   numpy
   

6. Upload workflow

   reana-client upload -w sin-plot .
   

7. Start workflow

   reana-client start -w sin-plot
   

8. Monitor until finished

   while true; do
       status=$(reana-client status -w sin-plot | grep -i status | awk '{print $2}')
       echo "Current status: $status"
       [[ "$status" =~ ^(finished|failed)$ ]] && break
       sleep 5
   done
   

9. Retrieve the image

   reana-client getoutput -w sin-plot sin_plot.png .
   

   The file sin_plot.png will appear in the current directory.

Pitfalls & Tips

• Export token and server before any command:

  export REANA_SERVER_URL=https://reana.cern.ch   # or your dev URL
  export REANA_ACCESS_TOKEN=YOUR_TOKEN_HERE
  

• Verify the environment image contains the required libraries; otherwise build a custom Docker image and reference it.
• Pre‑pull the Docker image if your network blocks on‑the‑fly pulls.
• Use the virtual environment to avoid system‑wide package conflicts.

Verification

After step 9 you should have a sin_plot.png showing a smooth green sine wave with axis labels and a title.