refactor(deploy)!: Implement launcher script for decoupled deployment

README.md

@@ -3,6 +3,8 @@ title: AuraCart AI Assistant
 emoji: 🛒
 colorFrom: blue
 colorTo: green
+sdk: streamlit
+app_file: launcher.py
 python_version: 3.10
 pinned: false
 ---

launcher.py

@@ -0,0 +1,61 @@
+# Full Code for: launcher.py
+
+import subprocess
+import time
+import os
+
+# --- Step 1: Launch the FastAPI Backend ---
+# We use subprocess.Popen to start the backend in a new process,
+# which runs in the background. We redirect its output to a log file.
+
+print("--- LAUNCHER: Starting backend server... ---")
+
+# We construct the command to run uvicorn
+backend_command = [
+    "uvicorn",
+    "v2_multilingual_api.backend.main:app",
+    "--host", "0.0.0.0",
+    "--port", "8000"
+]
+
+# Open log files for the backend's output and errors
+backend_log = open("backend.log", "w")
+
+# Start the backend process
+backend_process = subprocess.Popen(backend_command, stdout=backend_log, stderr=backend_log)
+
+print(f"--- LAUNCHER: Backend process started with PID: {backend_process.pid} ---")
+print("--- LAUNCHER: Waiting 20 seconds for backend to initialize models... ---")
+time.sleep(20)
+
+# --- Step 2: Health Check for the Backend ---
+# Check if the process is still running. If poll() returns a number, it means it crashed.
+if backend_process.poll() is not None:
+    print("--- LAUNCHER: !!! BACKEND FAILED TO START !!! ---")
+    # Read the log file to find out why it failed
+    backend_log.close()
+    with open("backend.log", "r") as f:
+        print(f.read())
+    # Exit the launcher with an error code to make the build fail clearly
+    exit(1)
+else:
+    print("--- LAUNCHER: Backend health check passed. Process is running. ---")
+
+
+# --- Step 3: Launch the Streamlit Frontend ---
+# This command will run in the foreground and take over the main process.
+# This is what the Hugging Face Spaces platform expects.
+
+print("--- LAUNCHER: Starting frontend server... ---")
+
+# We use os.system for simplicity to run the final command
+frontend_command = (
+    "streamlit run v2_multilingual_api/frontend/app.py "
+    "--server.port 7860 "
+    "--server.address 0.0.0.0"
+)
+
+os.system(frontend_command)
+
+# Close the log file when the app is shut down
+backend_log.close()

packages.txt

@@ -1 +0,0 @@
-procps

setup.sh

@@ -1,35 +0,0 @@
-#!/bin/bash
-
-# -- Make the script "fail loud" --
-# This command ensures that if any single command fails, the whole script exits immediately.
-set -e
-
-# -- Add Execute Permissions --
-# This ensures the server can run this file as a script.
-chmod +x setup.sh
-
-echo "--- setup.sh script has started ---"
-
-# --- Start the Backend with Logging ---
-echo "Attempting to start backend server..."
-uvicorn v2_multilingual_api.backend.main:app --host 0.0.0.0 --port 8000 > backend.log 2>&1 &
-
-echo "Waiting for backend to initialize (20 seconds)..."
-sleep 20 
-
-# --- Health Check ---
-echo "Performing health check on the backend..."
-if ! pgrep -f "uvicorn v2_multilingual_api.backend.main:app"; then
-    echo "--- !!! BACKEND FAILED TO START !!! ---"
-    echo "--- Displaying contents of backend.log: ---"
-    cat backend.log
-    exit 1
-else
-    echo "Backend health check PASSED. Process is running."
-fi
-
-# --- Launch the Frontend ---
-echo "Starting frontend server..."
-streamlit run v2_multilingual_api.frontend/app.py --server.port 7860 --server.address 0.0.0.0
-
-echo "--- setup.sh script has finished ---"