add rle exponential backoff

Author: arvi18

github.py

@@ -1,17 +1,31 @@
-from fastapi import HTTPException, logger
+from fastapi import HTTPException
 import requests
+import time
+import logging
 
+logger = logging.getLogger(__name__)
 
-def get_pr_commits(repo_full_name, pr_number, github_token):
-    """Fetch the list of commits for a PR from GitHub API."""
+def get_pr_commits(repo_full_name: str, pr_number: int, github_token: str, retries: int = 3, backoff_factor: float = 0.5):
+    """Fetch the list of commits for a PR from GitHub API with retries and exception handling."""
     url = f"https://api.github.com/repos/{repo_full_name}/pulls/{pr_number}/commits"
-    print(url)
-    headers = {"Authorization": f"{github_token}", "Accept": "application/vnd.github.v3+json"}
+    headers = {
+        "Authorization": f"{github_token}",
+        "Accept": "application/vnd.github.v3+json"
+    }
 
-    response = requests.get(url, headers=headers)
-    
-    if response.status_code != 200:
-        logger.error(f"Failed to fetch commits: {response.text}")
-        raise HTTPException(status_code=500, detail="Error fetching PR commits")
+    for attempt in range(retries):
+        try:
+            response = requests.get(url, headers=headers, timeout=10)
+            if response.status_code == 200:
+                return response.json()
+            else:
+                logger.warning(f"Attempt {attempt + 1}: GitHub API returned {response.status_code} - {response.text}")
+        except requests.exceptions.RequestException as e:
+            logger.warning(f"Attempt {attempt + 1}: Request failed with exception: {e}")
 
-    return response.json()
+        sleep_time = backoff_factor * (2 ** attempt)
+        time.sleep(sleep_time)
+
+    # If all retries fail
+    logger.error(f"Failed to fetch commits for PR #{pr_number} in {repo_full_name} after {retries} attempts.")
+    raise HTTPException(status_code=502, detail="Failed to fetch PR commits from GitHub")