changed postgres_url to db, user, password etc

docker-compose.yaml

@@ -1,4 +1,3 @@
-version: "2"
 services:
   flask:
     build:
@@ -7,12 +6,33 @@ services:
     # command: sh -c "gunicorn -w 4 flaskr:app -b 0.0.0.0:5000 --access-logfile '-' --error-logfile '-'"
     # command: sh -c "ls"
     ports:
-      - "8200:5000"
+      - "5000:5000"
     volumes:
       - .:/app
     env_file: .env
     environment:
-      - POSTGRES_URL
+      - POSTGRES_DB
+      - POSTGRES_PORT
+      - POSTGRES_HOST
+      - POSTGRES_USER
+      - POSTGRES_PASSWORD
+    # extra_hosts:
+      # - "host.docker.internal:host-gateway"
+    depends_on:
+      - db
 
-    extra_hosts:
-      - "host.docker.internal:host-gateway"
+  db:
+    image: postgres:16-alpine
+    volumes: 
+      - ./data/:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_DB=timetrials-db
+      - POSTGRES_PORT=5432
+      - POSTGRES_HOST=db
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+    healthcheck:
+      test: pg_isready -U postgres -d timetrials-db
+      interval: 10s
+      timeout: 3s
+      retries: 3

flaskr/database.py

@@ -3,8 +3,22 @@ from flaskr import app
 from flask_sqlalchemy import SQLAlchemy
 from random import randint
 
+if not getenv("POSTGRES_URL") or (getenv("POSTGRES_URL") and not getenv("POSTGRES_URL").startswith("postgresql://")):
+    postgres_host = getenv("POSTGRES_HOST")
+    postgres_db = getenv("POSTGRES_DB")
+    postgres_port = getenv("POSTGRES_PORT")
+    postgres_user = getenv("POSTGRES_USER")
+    postgres_password = getenv("POSTGRES_PASSWORD")
+    postgres_variables = [postgres_host, postgres_db, postgres_port, postgres_user, postgres_password]
+
+    for var in postgres_variables:
+        if not var:
+            raise ValueError("All environment variables not set")
+
+    app.config["SQLALCHEMY_DATABASE_URI"] = f"postgresql://{postgres_user}:{postgres_password}@{postgres_host}:{postgres_port}/{postgres_db}"
+else:
+    app.config["SQLALCHEMY_DATABASE_URI"] = getenv("POSTGRES_URL")
 
-app.config["SQLALCHEMY_DATABASE_URI"] = getenv("POSTGRES_URL")
 db = SQLAlchemy(app)