droplets: Add a tool to clean up old hostnames in DNS.

tools/droplets/cleanup.py

@@ -0,0 +1,49 @@
+import argparse
+import configparser
+import os
+
+import digitalocean
+
+
+def get_config() -> configparser.ConfigParser:
+    config = configparser.ConfigParser()
+    config.read(os.path.join(os.path.dirname(os.path.abspath(__file__)), "conf.ini"))
+    return config
+
+
+parser = argparse.ArgumentParser(description="Clean up old A / AAAA records in zulipdev.org")
+parser.add_argument("--force", action="store_true")
+
+if __name__ == "__main__":
+    args = parser.parse_args()
+
+    config = get_config()
+    api_token = config["digitalocean"]["api_token"]
+
+    seen_ips = set()
+    if not args.force:
+        print("WOULD DELETE:")
+
+    manager = digitalocean.Manager(token=api_token)
+    my_droplets = manager.get_all_droplets()
+    for droplet in my_droplets:
+        seen_ips.add(droplet.ip_address)
+        if droplet.ipv6:
+            seen_ips.update(net["ip_address"] for net in droplet.networks["v6"])
+
+    domain = digitalocean.Domain(token=api_token, name="zulipdev.org")
+    domain.load()
+    records = domain.get_records()
+
+    for record in sorted(records, key=lambda e: ".".join(reversed(e.name.split(".")))):
+        if record.type not in ("AAAA", "A"):
+            continue
+        elif record.data in seen_ips:
+            continue
+        else:
+            print(f"{record.type} {record.name} = {record.data}")
+            if args.force:
+                record.destroy()
+
+    if not args.force:
+        print("Re-run with --force to delete")