simple look

logging-proxy/Dockerfile

@@ -2,7 +2,7 @@ FROM python:3.12-slim
 
 WORKDIR /app
 
-RUN pip install flask requests
+RUN pip install flask requests Flask-Sockets gevent gevent-websocket websocket-client
 
 COPY proxy.py .
 

logging-proxy/proxy.py

@@ -3,18 +3,24 @@ import requests
 import sys
 import os
 import json
+from flask_sockets import Sockets
+import websocket
+import gevent
 
 app = Flask(__name__)
+sockets = Sockets(app)
 
-# Target JSON-RPC server, e.g., an Ethereum node
+# Target URLs
-TARGET_URL = os.getenv('TARGET_URL', 'http://host.docker.internal:8545')
+TARGET_URL_HTTP = os.getenv('TARGET_URL', 'http://host.docker.internal:8545')
+# Derive WebSocket URL from HTTP URL
+TARGET_URL_WS = TARGET_URL_HTTP.replace('http://', 'ws://').replace('https://', 'wss://')
 
 @app.route('/', methods=['POST'])
 def proxy():
     incoming = request.get_json()
     request_log = f"==> Request:\n{json.dumps(incoming, indent=2)}"
 
-    response = requests.post(TARGET_URL, json=incoming)
+    response = requests.post(TARGET_URL_HTTP, json=incoming)
     outgoing = response.json()
 
     log_lines = [request_log]
@@ -27,5 +33,79 @@ def proxy():
         
     return jsonify(outgoing)
 
+# New WebSocket handler
+@sockets.route('/')
+def proxy_socket(ws):
+    """Handles incoming WebSocket connections and relays messages."""
+    print("==> WebSocket connection received", file=sys.stdout, flush=True)
+    target_ws = None
+    try:
+        # Connect to the target WebSocket server
+        target_ws = websocket.create_connection(TARGET_URL_WS)
+        print(f"==> WebSocket connection established to {TARGET_URL_WS}", file=sys.stdout, flush=True)
+
+        # Use gevent greenlets to relay messages concurrently
+        from gevent import spawn
+
+        def relay_to_target():
+            """Relay messages from the client to the target."""
+            try:
+                while not ws.closed and target_ws.connected:
+                    message = ws.receive()
+                    if message is not None:
+                        target_ws.send(message)
+                    else: # Client closed
+                        break
+            except websocket.WebSocketConnectionClosedException:
+                print("<== WebSocket client connection closed.", file=sys.stdout, flush=True)
+            except Exception as e:
+                print(f"Error receiving from client or sending to target: {e}", file=sys.stderr, flush=True)
+            finally:
+                if target_ws and target_ws.connected:
+                    target_ws.close()
+
+        def relay_to_client():
+            """Relay messages from the target to the client."""
+            try:
+                while target_ws.connected and not ws.closed:
+                    message = target_ws.recv()
+                    if message:
+                        ws.send(message)
+                    else: # Target closed
+                        break
+            except websocket.WebSocketConnectionClosedException:
+                print("<== WebSocket target connection closed.", file=sys.stdout, flush=True)
+            except Exception as e:
+                print(f"Error receiving from target or sending to client: {e}", file=sys.stderr, flush=True)
+            finally:
+                if not ws.closed:
+                    ws.close()
+
+        # Start the relay greenlets
+        g_to_target = spawn(relay_to_target)
+        g_to_client = spawn(relay_to_client)
+
+        # Wait for both relays to complete
+        gevent.joinall([g_to_target, g_to_client], raise_error=False) # Don't raise errors here, already printed
+
+    except websocket.WebSocketException as e:
+        print(f"<== WebSocket connection to target {TARGET_URL_WS} failed: {e}", file=sys.stderr, flush=True)
+    except Exception as e:
+        print(f"An unexpected error occurred in WebSocket proxy: {e}", file=sys.stderr, flush=True)
+    finally:
+        # Ensure connections are closed
+        if target_ws and target_ws.connected:
+            target_ws.close()
+        if not ws.closed:
+            ws.close()
+        print("<== WebSocket handler finished", file=sys.stdout, flush=True)
+
 if __name__ == '__main__':
-    app.run(host='0.0.0.0', port=8545)
+    # Use gevent-websocket server instead of Flask's default development server
+    from gevent import pywsgi
+    from geventwebsocket.handler import WebSocketHandler
+    print(f"Starting server on 0.0.0.0:8545 supporting HTTP and WebSocket...")
+    print(f"HTTP proxying to: {TARGET_URL_HTTP}")
+    print(f"WebSocket proxying to: {TARGET_URL_WS}")
+    server = pywsgi.WSGIServer(('0.0.0.0', 8545), app, handler_class=WebSocketHandler)
+    server.serve_forever()