Handle existing blocks in a smarter way

src/fediblockhole/__init__.py

@@ -61,6 +61,18 @@ def sync_blocklists(conf: argparse.Namespace):
     export_fields.extend(conf.export_fields)
 
     blocklists = []
+
+    # Fetch existing destination blocklists, as Misskey server block
+    # update is an all at once operation. We cannot update blocks
+    # individually.
+    for dest in conf.blocklist_instance_destinations:
+        host = dest['domain']
+        token = dest['token']
+        scheme = dest.get('scheme', 'https')
+        blocklists.append(
+            fetch_instance_blocklist(host, token, True, import_fields, scheme)
+        )
+
     # Fetch blocklists from URLs
     if not conf.no_fetch_url:
         blocklists.extend(fetch_from_urls(conf.blocklist_url_sources,
@@ -762,6 +774,7 @@ def push_blocklist(token: str, host: str, blocklist: list[DomainBlock],
     # Force use of the admin API, and add 'id' to the list of fields
     if 'id' not in import_fields:
         import_fields.append('id')
+
     serverblocks = fetch_instance_blocklist(host, token, True, import_fields, scheme)
 
     # # Convert serverblocks to a dictionary keyed by domain name
@@ -774,7 +787,7 @@ def push_blocklist(token: str, host: str, blocklist: list[DomainBlock],
 
             oldblock = serverblocks[newblock.domain]
 
-            change_needed = is_change_needed(oldblock, newblock, import_fields)
+            change_needed = is_change_needed(oldblock, newblock, ["severity"])
 
             # Is the severity changing?
             if 'severity' in change_needed:
@@ -815,12 +828,6 @@ def push_blocklist(token: str, host: str, blocklist: list[DomainBlock],
             # Make sure the new block doesn't clobber a domain with followers
             newblock.severity = check_followed_severity(host, token, newblock.domain, newblock.severity, max_followed_severity, scheme)
 
-    # Append existing blocks to the new blocks (needed because Misskey
-    # is all at once update operation)
-    for existing_block in serverblocks.values():
-        if existing_block.domain not in blocklist:
-            blocklist.blocks[existing_block.domain] = existing_block
-
     apply_blocks_misskey(blocklist, host, scheme, token)
 
 def apply_blocks_misskey(blocklist: Blocklist, host:str, scheme: str="https", token: str=None):