Update Dockerfile and requirements.txt; refactor NivraRAGRetriever import handling

Dockerfile

@@ -1,31 +1,19 @@
-FROM python:3.10-slim
+FROM python:3.11-slim
 
-# Set working directory
 WORKDIR /app
 
-# Environment sanity
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
+ENV GRADIO_SERVER_NAME=0.0.0.0
+ENV GRADIO_SERVER_PORT=7860
 
-# Install system dependencies
-RUN apt-get update && apt-get install -y \
-    build-essential \
-    git \
-    && rm -rf /var/lib/apt/lists/*
-
-# Copy requirements first (better caching)
 COPY requirements.txt .
 
-# Install Python dependencies
 RUN pip install --no-cache-dir --upgrade pip \
     && pip install --no-cache-dir -r requirements.txt
 
-# Copy application code
 COPY . .
 
-# HF Spaces port
 EXPOSE 7860
 
-# Start FastAPI
-CMD ["uvicorn", "backend.api_backend:app", "--host", "0.0.0.0", "--port", "7860", "--root-path", "/proxy/7860"]
-
+CMD ["python", "app.py"]

nivra_agent.py

@@ -9,7 +9,6 @@ import json
 from datetime import datetime
 from dotenv import load_dotenv
 
-from agent.rag_retriever import NivraRAGRetriever
 from agent.text_symptom_tool import analyze_symptom_text
 from agent.image_symptom_tool import analyze_symptom_image
 
@@ -46,7 +45,12 @@ _rag = None
 def get_rag():
     global _rag
     if _rag is None:
-        _rag = NivraRAGRetriever()
+        try:
+            from agent.rag_retriever import NivraRAGRetriever
+
+            _rag = NivraRAGRetriever()
+        except Exception:
+            _rag = False
     return _rag
 
 # ==================================================
@@ -241,7 +245,11 @@ def nivra_chat(user_input, chat_history=None):
 
     try:
         tool_results.append(analyze_symptom_text.invoke(user_input))
-        tool_results.append(get_rag().getRelevantDocs(user_input))
+        rag = get_rag()
+        if rag:
+            tool_results.append(rag.getRelevantDocs(user_input))
+        else:
+            tool_results.append("RAG UNAVAILABLE")
     except Exception:
         tool_results.append("TOOL FAILURE")
 

requirements.txt

@@ -6,18 +6,11 @@ python-multipart
 
 # Networking
 httpx
+requests
 
-# LangChain (stable)
+# Agent runtime
 langchain
 langchain-core
 langchain-community
 langchain-groq
-langchain-huggingface
-langchain-chroma   # ← THIS WAS MISSING
-
-# Groq SDK
 groq
-
-# Vector DB / embeddings
-chromadb
-sentence-transformers