ci(workflow): add cache buster and exit on no updates

.github/workflows/main.yml

@@ -1,8 +1,3 @@
-name: Fetch CloudFormation resource specification and update this VSCode extension.
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "10 11 * * 5" # At 11:10 on Friday.
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -22,9 +17,17 @@ jobs:
           sudo apt install python3-setuptools
           python3 -m pip install --upgrade pip && pip3 install -r src/requirements.txt
       - name: Check if AWS updated the CloudFormation resource specification
+        id: check_spec
         run: |
           echo "Check if the cfn resource spec has been updated"
-          python3 src/check-cfn-resource-spec-hash.py
+          python3 src/check-cfn-resource-spec-hash.py || echo "::set-output name=spec_updated::false"
+        continue-on-error: true
+
+      - name: Stop if no changes
+        if: steps.check_spec.outputs.spec_updated == 'false'
+        run: |
+          echo "No updates to the CloudFormation resource spec. Exiting workflow."
+          exit 0
       - name: Update the yaml cfn resource type snippets
         run: |
           echo "Update the yaml cfn resource type snippets"

.gitignore

@@ -2,6 +2,7 @@
 node_modules
 *.vsix
 .mypy_cache
+.python-version
 
 # Ignore everything in the test folder
 /test/*

README.md

@@ -79,7 +79,7 @@ If you have a feature request or an issue, please let me know on [Github](https:
 
 ## Author
 
-Danny Steenman
+[Danny Steenman](https://towardsthecloud.com/about)
 
 [![](https://img.shields.io/badge/LinkedIn-0077B5?style=for-the-badge&logo=linkedin&logoColor=white)](https://www.linkedin.com/in/dannysteenman)
 [![](https://img.shields.io/badge/X-000000?style=for-the-badge&logo=x&logoColor=white)](https://twitter.com/dannysteenman)

src/check-cfn-resource-spec-hash.py

@@ -1,30 +1,36 @@
 import hashlib
+from datetime import datetime, timezone
 
 import requests
 
 
 def get_resource_spec():
+    # Add a cache buster using a timezone-aware datetime object
     cfn_resource_spec_url = "https://d1uauaxba7bl26.cloudfront.net/latest/gzip/CloudFormationResourceSpecification.json"
-    # Load the source data and hash it
-    response = requests.get(cfn_resource_spec_url)
-
+    current_time = datetime.now(timezone.utc).timestamp()
+    response = requests.get(cfn_resource_spec_url, params={"nocache": current_time})
+    response.raise_for_status()
     return response
 
 
+def calculate_hash(content):
+    return hashlib.sha256(content).hexdigest()
+
+
 # Load the current hash
 with open("src/current-cfn-spec-hash", "r+") as file:
-    current_hash = file.read()
-    # Load the source data and hash it
-    new_hash = hashlib.md5(get_resource_spec().content).hexdigest()
+    current_hash = file.read().strip()
+    new_hash = calculate_hash(get_resource_spec().content)
 
     if new_hash == current_hash:
         print(f"The new hash: {new_hash} matches with our current hash: {current_hash}.")
         print("The snippets are up-to-date, stopping the pipeline.")
         exit(1)
     else:
         print(
-            f"Found an update in the cfn-resource-specification, let's update the hash to: {new_hash}"
-            " and continue with updating the cfn resource snippets!"
+            f"Found an update in the cfn-resource-specification, let's update the hash to: {new_hash} "
+            "and continue with updating the cfn resource snippets!"
         )
         file.seek(0)
         file.write(new_hash)
+        file.truncate()