[aws-lambda] Improve script (#259)

- make the script more resilient to changes in the page by using column names,
- use the product release releaseDate as the date, else the date the version was first found, else the current date (previously the date the version was first found was not used),
- move some code to the Product class.

src/aws-lambda.py

@@ -1,50 +1,40 @@
+import datetime
 from bs4 import BeautifulSoup
 from common import http
 from common import endoflife
-from datetime import datetime
 
 """Fetches AWS lambda runtimes from https://docs.aws.amazon.com.
 
 This script does not retrieve release dates, as they are only available in release announcements.
-Instead, it uses the release dates from the endoflife.date product file. This has the advantage of
-being warned about new releases, without having releaseDate information (wrongly) updated.
+Instead, it uses the release dates from the endoflife.date product file, or alternatively the
+date the release was first detected (or the current date if none is found).
 
 If one day release dates are available in the AWS documentation, it would be better to make use
 them though. Note that this would also be unnecessary if it was possible to disable release/latest
 release dates updates in the latest.py script."""
 
-
-def get_release_data(product):
-    try:
-        return endoflife.load_product(product.name)
-    except FileNotFoundError:
-        print(f"{product.name} file not found, real release dates will not be used.")
-        return {}
-
-
-def release_date(releaseCycle, releases_data):
-    if 'releases' in releases_data.keys():
-        for release in releases_data['releases']:
-            if releaseCycle == release['releaseCycle']:
-                return release['releaseDate']
-
-    return datetime.now()
-
-
-product = endoflife.Product("aws-lambda")
-print(f"::group::{product.name}")
-releases_data = get_release_data(product)
+print("::group::aws-lambda")
+product = endoflife.Product("aws-lambda", load_product_data=True, load_versions_data=True)
 response = http.fetch_url("https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html")
 soup = BeautifulSoup(response.text, features="html5lib")
 
-for row in soup.find_all("tr"):
-    cells = row.find_all("td")
-    if len(cells) != 6 and len(cells) != 5: # 6 = Supported Runtimes, 5 = Unsupported Runtimes
+for table in soup.find_all("table"):
+    headers = [th.get_text().strip().lower() for th in table.find("thead").find_all("tr")[1].find_all("th")]
+    if "identifier" not in headers:
         continue
 
-    identifier = cells[1].get_text().strip()
-    date = release_date(identifier, releases_data)
-    product.declare_version(identifier, date)
+    identifier_index = headers.index("identifier")
+    for row in table.find("tbody").find_all("tr"):
+        cells = row.find_all("td")
+        identifier = cells[identifier_index].get_text().strip()
+
+        date = product.get_release_date(identifier)  # use the product releaseDate if available
+        if date is None:
+            date = product.get_old_version_date(identifier)  # else use the previously found date
+        if date is None:
+            date = datetime.date.today()  # else use today's date
+
+        product.declare_version(identifier, date)
 
 product.write()
 print("::endgroup::")