Upload utils.py

utils.py

@@ -0,0 +1,45 @@
+from collections import OrderedDict
+from threading import Thread
+
+from flask import Flask
+
+flask_app = Flask(__name__)
+
+
+@flask_app.route("/", methods=["GET"])
+def home() -> str:
+    """
+    Keepalive endpoint for hosting services.
+    """
+    return "I'm alive"
+
+
+def keepalive_run() -> None:
+    """
+    Run keepalive Flask app in a daemon thread.
+    """
+    def flask_run():
+        flask_app.run(host="0.0.0.0", port="7860")
+    flask_thread = Thread(target=flask_run, daemon=True)
+    flask_thread.start()
+
+
+class LRUCache:
+    """Least Recently Used (LRU) cache prototype implementation"""
+    def __init__(self, max_size):
+        self.max_size = max_size
+        self.cache = OrderedDict()
+
+    def __getitem__(self, key):
+        try:
+            val = self.cache[key]
+            self.cache.move_to_end(key)
+            return val
+        except KeyError:
+            return None
+
+    def __setitem__(self, key, value):
+        self.cache[key] = value
+        self.cache.move_to_end(key)
+        if len(self.cache) > self.max_size:
+            self.cache.popitem(last=False)