[rds] Refactor script (#242)

Make the script more readable, mostly by:

- using the Product class,
- a little bit of renaming and documentation.

src/rds.py

@@ -4,33 +4,35 @@ from common import http
 from common import dates
 from common import endoflife
 
-VERSION_REGEX = r"(?P<v>\d+(?:\.\d+)*)"  # https://regex101.com/r/BY1vwV/1
-DBS = {
-    "mysql": "https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MySQL.Concepts.VersionMgmt.html",
-    "postgresql": "https://docs.aws.amazon.com/AmazonRDS/latest/PostgreSQLReleaseNotes/postgresql-release-calendar.html",
+"""Fetches Amazon RDS versions from the version management pages on AWS docs.
+
+Pages parsed by this script are expected to have version tables with a version in the first column and its release date
+in the third column (usually named 'RDS release date').
+"""
+
+PRODUCTS = {
+    "amazon-rds-mysql": "https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MySQL.Concepts.VersionMgmt.html",
+    "amazon-rds-postgresql": "https://docs.aws.amazon.com/AmazonRDS/latest/PostgreSQLReleaseNotes/postgresql-release-calendar.html",
 }
+VERSION_REGEX = re.compile(r"(?P<version>\d+(?:\.\d+)*)", flags=re.IGNORECASE)  # https://regex101.com/r/BY1vwV/1
 
-for db, url in DBS.items():
-    print(f"::group::{db}")
-    versions = {}
-
+for product_name, url in PRODUCTS.items():
+    print(f"::group::{product_name}")
+    product = endoflife.Product(product_name)
     response = http.fetch_url(url)
     soup = BeautifulSoup(response.text, features="html5lib")
 
     for table in soup.find_all("table"):
         for row in table.find_all("tr"):
             columns = row.find_all("td")
+            if len(columns) <= 3:
+                continue
 
-            # Must match both the 'Supported XXX minor versions' and
-            # 'Supported XXX major versions' to have correct release dates
-            if len(columns) > 3:
-                m = re.search(VERSION_REGEX, columns[0].text.strip(), flags=re.IGNORECASE)
-                if m:
-                    date = dates.parse_date(columns[2].text).strftime("%Y-%m-%d")
-                    if date:
-                        version = m.group("v")
-                        print(f"{version} : {date}")
-                        versions[version] = date
+            version_match = VERSION_REGEX.search(columns[0].text.strip())
+            if version_match:
+                version = version_match.group("version")
+                date = dates.parse_date(columns[2].text)
+                product.declare_version(version, date)
 
-    endoflife.write_releases(f"amazon-rds-{db.lower()}", versions)
+    product.write()
     print("::endgroup::")