Fix Phase 1 Validation: Implement FastAPI Gateway on port 7860

app.py

@@ -132,7 +132,7 @@ st.markdown("""
 """, unsafe_allow_html=True)
 
 # ─── Constants ───────────────────────────────────────────────────────────────
-ENV_BASE_URL = "http://localhost:8000"
+ENV_BASE_URL = "http://localhost:7860"
 TASKS = ["single-pass-review", "iterative-negotiation", "escalation-judgment"]
 
 # ─── Helper Functions ─────────────────────────────────────────────────────────

gateway.py

@@ -0,0 +1,59 @@
+import os
+import httpx
+from fastapi import FastAPI, Request, Response
+from fastapi.responses import StreamingResponse
+from server.app import app as env_app
+
+# The Gateway App
+app = FastAPI(title="PR Review Gateway")
+
+# 1. Mount Environment API Routes (Primary for OpenEnv Validator)
+# These will be available on the main port 7860
+app.include_router(env_app.router)
+
+# 2. Proxy for Streamlit Dashboard (Internal port 8501)
+STREAMLIT_URL = "http://localhost:8501"
+client = httpx.AsyncClient(base_url=STREAMLIT_URL)
+
+@app.api_route("/{path:path}", methods=["GET", "POST", "PUT", "DELETE", "OPTIONS", "HEAD", "PATCH"])
+async def proxy_to_streamlit(request: Request, path: str):
+    """
+    Catch-all route to proxy everything else to the Streamlit dashboard on port 8501.
+    """
+    url = f"{STREAMLIT_URL}/{path}"
+    
+    # Forward the request headers and body
+    headers = dict(request.headers)
+    # Remove 'host' to avoid proxy confusion
+    headers.pop("host", None)
+    
+    # Handle Streamlit's WebSocket and long-polling if needed
+    # (Note: For full WebSocket support, a more complex proxy is usually needed, 
+    # but for standard Streamlit on HF, this basic forwarder often works for the UI)
+    
+    # Get request body if it exists
+    body = await request.body()
+    
+    # Send request to Streamlit
+    try:
+        response = await client.request(
+            method=request.method,
+            url=url,
+            headers=headers,
+            params=request.query_params,
+            content=body,
+            timeout=30.0
+        )
+        
+        # Return the response back to the user
+        return Response(
+            content=response.content,
+            status_code=response.status_code,
+            headers=dict(response.headers)
+        )
+    except Exception as e:
+        return Response(content=f"Gateway Error: {e}", status_code=502)
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=7860)

start.sh

@@ -1,12 +1,13 @@
 #!/bin/bash
 
-# Start the FastAPI backend on port 8000
-echo "Starting FastAPI Backend on port 8000..."
-uvicorn server.app:app --host 0.0.0.0 --port 8000 &
+# Start the Streamlit dashboard internally on port 8501
+echo "Starting Streamlit Dashboard on port 8501..."
+streamlit run app.py --server.port 8501 --server.address 0.0.0.0 --server.headless true &
 
-# Start the Streamlit dashboard on port 7860 (default HF Spaces port)
-echo "Starting Streamlit Dashboard on port 7860..."
-streamlit run app.py --server.port 7860 --server.address 0.0.0.0 &
+# Start the FastAPI Gateway on the primary port 7860
+# This gateway handles /reset, /step, and proxies everything else to Streamlit
+echo "Starting FastAPI Gateway on port 7860..."
+uvicorn gateway:app --host 0.0.0.0 --port 7860 &
 
 # Wait for all processes to finish
 wait