Check the GitLab instance.

functions.tf

@@ -2,6 +2,7 @@ locals {
   function_name_prefix = local.Name
   functions = [
     "_dns",
+    "gitlab",
   ]
 }
 

requirements.txt

 dnspython
+requests

src/gitlab.py

+from utils import check_url, publish
+
+
+def handler(event, context):  # pylint: disable=unused-argument
+    """Lambda event handler."""
+    checks = [
+        {"url": "http://git.shore.co.il/", "codes": [301, 302]},
+        {"url": "https://git.shore.co.il/", "codes": [301, 302]},
+        {"url": "https://git.shore.co.il/explore/", "codes": [200]},
+    ]
+
+    for check in checks:
+        if not check_url(check["url"], valid_codes=check["codes"]):
+            message = f"Failed check for {check['url']}."
+            print(message)
+            publish(message)
+        else:
+            print(f"{check['url']} is OK.")
+
+
+if __name__ == "__main__":
+    handler("event", "context")

src/utils.py

 # pylint: disable=import-error
 import os
 import boto3
+import requests
 
 
 TOPIC_ARN = os.getenv("TOPIC_ARN")
@@ -10,3 +11,14 @@ def publish(message):
     """Publish an SNS message."""
     client = boto3.client("sns")
     client.publish(TopicArn=TOPIC_ARN, Message=message)
+
+
+def check_url(url, method="GET", valid_codes=(200)):
+    """Checks URL for validity.
+
+    Allows specifying the HTTP method and a list of valid codes."""
+    try:
+        response = requests.request(method, url, allow_redirects=False)
+        return response.status_code in valid_codes
+    except Exception:  # pylint: disable=broad-except
+        return False