From f5e25b58ca4aa949930a23c118496f7e85b39241 Mon Sep 17 00:00:00 2001
From: Muskankr <mkr803967@gmail.com>
Date: Mon, 13 Jul 2026 11:19:00 +0530
Subject: [PATCH] Add caching to /weather endpoint to reduce API calls

---
 backend/__init__.py    | 13 ++++++++++++-
 backend/alertsystem.py | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/backend/__init__.py b/backend/__init__.py
index c6077fd..b533b3f 100644
--- a/backend/__init__.py
+++ b/backend/__init__.py
@@ -1,2 +1,13 @@
 # intentionally left empty — makes backend a package for making
-# it as importable from the outside
\ No newline at end of file
+# it as importable from the outside
+
+from flask import Flask
+from flask_caching import Cache
+
+app = Flask(__name__)
+
+# Simple in‑memory cache, 5 min default timeout
+cache = Cache(app, config={'CACHE_TYPE': 'SimpleCache', 'CACHE_DEFAULT_TIMEOUT': 300})
+
+# Import routes after app + cache are ready
+from backend import alertsystem
diff --git a/backend/alertsystem.py b/backend/alertsystem.py
index bde3472..4c9ecab 100644
--- a/backend/alertsystem.py
+++ b/backend/alertsystem.py
@@ -2,6 +2,8 @@
 import sys
 import requests
 
+from flask import request, jsonify
+from backend import app, cache
 from dotenv import load_dotenv
 
 load_dotenv()
@@ -107,6 +109,36 @@ def frontend_files(filename):
 CYCLONE_RISK_THRESHOLD   = 0.60
 DROUGHT_RISK_THRESHOLD   = 0.70
 
+
+OPENWEATHER_API_KEY = "YOUR_KEY"
+
+@app.route("/weather")
+def weather():
+    city = request.args.get("city")
+    state = request.args.get("state")
+    country = request.args.get("country")
+
+    if not city or not country:
+        return jsonify({"error": "Missing required fields"}), 400
+
+    # Build cache key
+    cache_key = f"weather:{city}:{state}:{country}"
+
+    # Check cache first
+    cached = cache.get(cache_key)
+    if cached:
+        return jsonify(cached)
+
+    # If not cached, call OpenWeatherMap
+    url = f"http://api.openweathermap.org/data/2.5/weather?q={city},{state},{country}&appid={OPENWEATHER_API_KEY}"
+    resp = requests.get(url)
+    data = resp.json()
+
+    # Store in cache
+    cache.set(cache_key, data)
+
+    return jsonify(data)
+
 # =========================================================
 # GET LOCATION COORDINATES (Nominatim / OpenStreetMap)
 # =========================================================