update cache and parsing algorithm

.github/scripts/code_review.py

@@ -3,9 +3,11 @@ import os
 import re
 import fnmatch
 import json
+import datetime
 from openai import OpenAI
 from anthropic import Anthropic
 import google.generativeai as genai
+from google.generativeai import caching
 from collections import defaultdict
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from typing import Any, Optional, Callable
@@ -134,10 +136,17 @@ def parse_provider(
         )
     elif any(key in model for key in ["gemini"]):
         genai.configure(api_key=GOOGLE_API_KEY)
-        gemini = genai.GenerativeModel(model, system_instruction=system_prompt)
+        cache = caching.CachedContent.create(
+            model=f"models/{model}",
+            display_name="Gitea Code Reviewer",  # used to identify the cache
+            system_instruction=system_prompt,
+            contents=[],
+            ttl=datetime.timedelta(minutes=5),
+        )
+        gemini = genai.GenerativeModel.from_cached_content(cached_content=cache)
         return (
             lambda prompt: gemini.generate_content(prompt),
-            lambda response: response.text.strip() or "[]",
+            lambda response: response.text.strip("`").lstrip("json").strip() or "[]",
         )
     else:
         raise ValueError(f"Invalid model: {model}")