added graphviz server and client

Author: wassfila

containers/docker-compose.yaml

@@ -5,6 +5,12 @@ services:
       dockerfile: graphviz.Dockerfile
     volumes:
       - ../cache:/data
+  graphviz-server:
+    build:
+      context: ./dockerfiles/graphviz-server
+      dockerfile: Dockerfile
+    ports:
+      - 8080:8080
   apache:
     image: httpd:latest
     volumes:

containers/dockerfiles/graphviz-server/Dockerfile

@@ -0,0 +1,20 @@
+# Use an official Python runtime as a parent image
+FROM python:3.10-slim
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Install graphviz
+RUN apt-get update && apt-get install -y graphviz && rm -rf /var/lib/apt/lists/*
+
+# Copy the current directory contents into the container at /app
+COPY . /app
+
+# Install any needed packages specified in requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Define environment variable
+ENV NAME World
+
+# Run app.py when the container launches
+CMD ["python", "server.py"]

containers/dockerfiles/graphviz-server/requirements.txt

@@ -0,0 +1,2 @@
+Flask
+graphviz

containers/dockerfiles/graphviz-server/server.py

@@ -0,0 +1,24 @@
+from flask import Flask, request, send_file
+import graphviz
+
+app = Flask(__name__)
+
+@app.route('/graph', methods=['POST'])
+def graph():
+    # Get the dot format graph from the request
+    dot_string = request.data.decode()
+    
+    try:
+        # Create a graph from the dot string
+        dot = graphviz.Source(dot_string)
+        # Render the graph to a file
+        output_path = '/tmp/graph'
+        dot.render(output_path, format='png', cleanup=True)
+        
+        # Send the file back
+        return send_file(output_path + '.png', mimetype='image/png')
+    except Exception as e:
+        return str(e), 400
+
+if __name__ == '__main__':
+    app.run(debug=True, host='0.0.0.0', port=8080)

containers/graphviz-client.py

@@ -0,0 +1,25 @@
+import requests
+
+# URL of the graph endpoint
+url = 'http://localhost:8080/graph'
+
+# DOT language description of the graph
+dot_text = """
+    digraph G {
+        A -> B;
+        B -> C;
+        C -> A;
+    }
+"""
+
+# Send the DOT string as a POST request to the server
+response = requests.post(url, data=dot_text)
+
+# Check if the request was successful
+if response.status_code == 200:
+    # Save the image
+    with open('output_graph.png', 'wb') as f:
+        f.write(response.content)
+    print("Graph image saved as 'output_graph.png'.")
+else:
+    print("Failed to generate graph:", response.text)

requirements.txt

@@ -1,2 +1,3 @@
 pyyaml
 networkx
+requests