More blocklist fixes (raidensakura#15)

* update requirements.txt

* fix blocklist migration detection

* fix migrations.py type hints for python 3.8

bot.py

@@ -173,11 +173,6 @@ def startup(self):
         logger.line()
         logger.info("discord.py: v%s", discord.__version__)
         logger.line()
-        if not self.config["blocked"] or not self.config["blocked_roles"]:
-            logger.warning(
-                "Un-migrated blocklists found. Please run the '[p]migrate blocklist' command after backing "
-                "up your config/database. Blocklist functionality will be disabled until this is done."
-            )
 
     async def load_extensions(self):
         for cog in self.loaded_cogs:
@@ -581,6 +576,13 @@ async def on_ready(self):
             )
             logger.line()
 
+        if len(self.config["blocked"]) > 0 or len(self.config["blocked_roles"]) > 0:
+            logger.warning(
+                "Un-migrated blocklists found. Please run the '[p]migrate blocklist' command after backing "
+                "up your config/database. Blocklist functionality will be disabled until this is done."
+            )
+            logger.line()
+
         await self.threads.populate_cache()
 
         # closures

core/migrations.py

@@ -1,6 +1,6 @@
 import datetime
 import re
-from typing import Optional
+from typing import Optional, List
 
 from core import blocklist
 from core.models import getLogger
@@ -76,7 +76,7 @@ def _convert_legacy_block_format(
 
 async def _convert_legacy_block_list(
     blocklist_dict: dict,
-    blocklist_batch: list[blocklist.BlocklistEntry],
+    blocklist_batch: List[blocklist.BlocklistEntry],
     block_type: blocklist.BlockType,
     bot,
 ) -> int:
@@ -115,6 +115,10 @@ async def migrate_blocklist(bot):
     logger.info("preparing to migrate blocklist")
     skipped = 0
 
+    if len(blocked_users) == 0 and len(bot.blocked_roles) == 0:
+        logger.info("no blocklist entries to migrate")
+        return
+
     blocklist_batch: list[blocklist.BlocklistEntry] = []
     logger.info(f"preparing to process {len(blocked_users)} blocked users")
     skipped += await _convert_legacy_block_list(
@@ -133,8 +137,9 @@ async def migrate_blocklist(bot):
     )
     logger.info("processed blocked roles")
 
-    await bot.api.db.blocklist.insert_many([x.__dict__ for x in blocklist_batch])
-    blocklist_batch.clear()
+    if len(blocklist_batch) > 0:
+        await bot.api.db.blocklist.insert_many([x.__dict__ for x in blocklist_batch])
+        blocklist_batch.clear()
 
     logger.info("clearing old blocklists")
     bot.blocked_users.clear()