[commands] Refactor BucketType to not repeat in other places in code

discord/ext/commands/cooldowns.py

@@ -48,6 +48,25 @@ class BucketType(Enum):
     category = 5
     role     = 6
 
+    def get_key(self, msg):
+        if self is BucketType.user:
+            return msg.author.id
+        elif self is BucketType.guild:
+            return (msg.guild or msg.author).id
+        elif self is BucketType.channel:
+            return msg.channel.id
+        elif self is BucketType.member:
+            return ((msg.guild and msg.guild.id), msg.author.id)
+        elif self is BucketType.category:
+            return (msg.channel.category or msg.channel).id
+        elif self is BucketType.role:
+            # we return the channel id of a private-channel as there are only roles in guilds
+            # and that yields the same result as for a guild with only the @everyone role
+            # NOTE: PrivateChannel doesn't actually have an id attribute but we assume we are
+            # recieving a DMChannel or GroupChannel which inherit from PrivateChannel and do
+            return (msg.channel if isinstance(msg.channel, PrivateChannel) else msg.author.top_role).id
+
+
 class Cooldown:
     __slots__ = ('rate', 'per', 'type', '_window', '_tokens', '_last')
 
@@ -123,23 +142,7 @@ class CooldownMapping:
         return cls(Cooldown(rate, per, type))
 
     def _bucket_key(self, msg):
-        bucket_type = self._cooldown.type
-        if bucket_type is BucketType.user:
-            return msg.author.id
-        elif bucket_type is BucketType.guild:
-            return (msg.guild or msg.author).id
-        elif bucket_type is BucketType.channel:
-            return msg.channel.id
-        elif bucket_type is BucketType.member:
-            return ((msg.guild and msg.guild.id), msg.author.id)
-        elif bucket_type is BucketType.category:
-            return (msg.channel.category or msg.channel).id
-        elif bucket_type is BucketType.role:
-            # we return the channel id of a private-channel as there are only roles in guilds
-            # and that yields the same result as for a guild with only the @everyone role
-            # NOTE: PrivateChannel doesn't actually have an id attribute but we assume we are
-            # recieving a DMChannel or GroupChannel which inherit from PrivateChannel and do
-            return (msg.channel if isinstance(msg.channel, PrivateChannel) else msg.author.top_role).id
+        return self._cooldown.type.get_key(msg)
 
     def _verify_cache_integrity(self, current=None):
         # we want to delete all cache objects that haven't been used
@@ -245,29 +248,11 @@ class MaxConcurrency:
     def __repr__(self):
         return '<MaxConcurrency per={0.per!r} number={0.number} wait={0.wait}>'.format(self)
 
-    def get_bucket(self, message):
-        bucket_type = self.per
-        if bucket_type is BucketType.default:
-            return 'global'
-        elif bucket_type is BucketType.user:
-            return message.author.id
-        elif bucket_type is BucketType.guild:
-            return (message.guild or message.author).id
-        elif bucket_type is BucketType.channel:
-            return message.channel.id
-        elif bucket_type is BucketType.member:
-            return ((message.guild and message.guild.id), message.author.id)
-        elif bucket_type is BucketType.category:
-            return (message.channel.category or message.channel).id
-        elif bucket_type is BucketType.role:
-            # we return the channel id of a private-channel as there are only roles in guilds
-            # and that yields the same result as for a guild with only the @everyone role
-            # NOTE: PrivateChannel doesn't actually have an id attribute but we assume we are
-            # recieving a DMChannel or GroupChannel which inherit from PrivateChannel and do
-            return (message.channel if isinstance(message.channel, PrivateChannel) else message.author.top_role).id
+    def get_key(self, message):
+        return self.per.get_key(message)
 
     async def acquire(self, message):
-        key = self.get_bucket(message)
+        key = self.get_key(message)
 
         try:
             sem = self._mapping[key]
@@ -281,7 +266,7 @@ class MaxConcurrency:
     async def release(self, message):
         # Technically there's no reason for this function to be async
         # But it might be more useful in the future
-        key = self.get_bucket(message)
+        key = self.get_key(message)
 
         try:
             sem = self._mapping[key]