Use a dict instead of getattr for parsing events.

Probably not a significant difference but might as well use it here.
The basic idea is to cache the getattr calls instead of repeatedly
doing it (since they're around 105ns on my machine). The dictionary
lookup is about 41ns on my machine.

The next step in speeding up library code some more should be in
the parser bodies themselves but that's a problem to tackle another
day.

discord/gateway.py

@@ -227,6 +227,7 @@ class DiscordWebSocket(websockets.client.WebSocketClientProtocol):
         # dynamically add attributes needed
         ws.token = client.http.token
         ws._connection = client._connection
+        ws._discord_parsers = client._connection.parsers
         ws._dispatch = client.dispatch
         ws.gateway = gateway
         ws.shard_id = shard_id
@@ -414,11 +415,9 @@ class DiscordWebSocket(websockets.client.WebSocketClientProtocol):
             log.info('Shard ID %s has successfully RESUMED session %s under trace %s.',
                      self.shard_id, self.session_id, ', '.join(trace))
 
-        parser = 'parse_' + event.lower()
-
         try:
-            func = getattr(self._connection, parser)
-        except AttributeError:
+            func = self._discord_parsers[event]
+        except KeyError:
             log.warning('Unknown event %s.', event)
         else:
             func(data)

discord/shard.py

@@ -221,6 +221,7 @@ class AutoShardedClient(Client):
 
         ws.token = self.http.token
         ws._connection = self._connection
+        ws._discord_parsers = self._connection.parsers
         ws._dispatch = self.dispatch
         ws.gateway = gateway
         ws.shard_id = shard_id

discord/state.py

@@ -33,6 +33,7 @@ import itertools
 import logging
 import math
 import weakref
+import inspect
 
 from .guild import Guild
 from .activity import _ActivityTag
@@ -88,6 +89,11 @@ class ConnectionState:
         self._activity = activity
         self._status = status
 
+        self.parsers = parsers = {}
+        for attr, func in inspect.getmembers(self):
+            if attr.startswith('parse_'):
+                parsers[attr[6:].upper()] = func
+
         self.clear()
 
     def clear(self):