Fix port binding issue with dynamic port selection

Added port conflict resolution to handle cases where port 8001 is already in use.
The app now checks if a port is available and incrementally tries higher ports
until it finds one that's free.

generated with BackendIM... (backend.im)

README.md

@@ -54,14 +54,22 @@ A fast, lightweight REST API service built with FastAPI and SQLite.
 Start the server with:
 
 ```bash
-uvicorn main:app --reload
+python main.py
 ```
 
-The API will be available at http://localhost:8000.
+Or manually with uvicorn:
+
+```bash
+uvicorn main:app --host 0.0.0.0 --port 8001 --reload
+```
+
+The application will automatically find an available port if the default port (8001) is already in use.
+
+The API will be available at http://localhost:8001.
 
 API documentation is available at:
-- Swagger UI: http://localhost:8000/docs
+- Swagger UI: http://localhost:8001/docs
-- ReDoc: http://localhost:8000/redoc
+- ReDoc: http://localhost:8001/redoc
 
 ## API Endpoints
 

app/core/config.py

@@ -6,6 +6,7 @@ from pydantic_settings import BaseSettings
 class Settings(BaseSettings):
     API_V1_STR: str = "/api/v1"
     PROJECT_NAME: str = "Quick REST API Service"
+    PORT: int = 8001
 
     # CORS settings
     BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []

main.py

@@ -1,10 +1,16 @@
 import uvicorn
+import socket
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.api.v1 import api_router
 from app.core.config import settings
 
+def is_port_in_use(port: int) -> bool:
+    """Check if a port is already in use"""
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        return s.connect_ex(('0.0.0.0', port)) == 0
+
 app = FastAPI(
     title=settings.PROJECT_NAME,
     openapi_url=f"{settings.API_V1_STR}/openapi.json",
@@ -25,4 +31,13 @@ if settings.BACKEND_CORS_ORIGINS:
 app.include_router(api_router, prefix=settings.API_V1_STR)
 
 if __name__ == "__main__":
-    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)
+    # Start with the preferred port
+    port = settings.PORT
+
+    # If the port is in use, try the next port
+    while is_port_in_use(port):
+        print(f"Port {port} is already in use, trying port {port+1}")
+        port += 1
+
+    print(f"Starting server on port {port}")
+    uvicorn.run("main:app", host="0.0.0.0", port=port, reload=True)