Allow use of orjson instead of json

The difference in speed seems negligible at start up, which is when
most time is taken for actually parsing JSON. I could potentially be
missing something but profiling didn't point to any discernable
difference.

discord/gateway.py

@@ -25,7 +25,6 @@ DEALINGS IN THE SOFTWARE.
 import asyncio
 from collections import namedtuple, deque
 import concurrent.futures
-import json
 import logging
 import struct
 import sys
@@ -421,7 +420,7 @@ class DiscordWebSocket:
             msg = self._zlib.decompress(self._buffer)
             msg = msg.decode('utf-8')
             self._buffer = bytearray()
-        msg = json.loads(msg)
+        msg = utils.from_json(msg)
 
         log.debug('For Shard ID %s: WebSocket Event: %s', self.shard_id, msg)
         self._dispatch('socket_response', msg)
@@ -882,7 +881,7 @@ class DiscordVoiceWebSocket:
         # This exception is handled up the chain
         msg = await asyncio.wait_for(self.ws.receive(), timeout=30.0)
         if msg.type is aiohttp.WSMsgType.TEXT:
-            await self.received_message(json.loads(msg.data))
+            await self.received_message(utils.from_json(msg.data))
         elif msg.type is aiohttp.WSMsgType.ERROR:
             log.debug('Received %s', msg)
             raise ConnectionClosed(self.ws, shard_id=None) from msg.data

discord/http.py

@@ -99,7 +99,7 @@ async def json_or_text(response: aiohttp.ClientResponse) -> Union[Dict[str, Any]
     text = await response.text(encoding='utf-8')
     try:
         if response.headers['content-type'] == 'application/json':
-            return json.loads(text)
+            return utils.from_json(text)
     except KeyError:
         # Thanks Cloudflare
         pass

discord/utils.py

@@ -63,6 +63,14 @@ import warnings
 
 from .errors import InvalidArgument
 
+try:
+    import orjson
+except ModuleNotFoundError:
+    HAS_ORJSON = False
+else:
+    HAS_ORJSON = True
+
+
 __all__ = (
     'oauth_url',
     'snowflake_time',
@@ -468,8 +476,19 @@ def _bytes_to_base64_data(data: bytes) -> str:
     return fmt.format(mime=mime, data=b64)
 
 
-def to_json(obj: Any) -> str:
+if HAS_ORJSON:
-    return json.dumps(obj, separators=(',', ':'), ensure_ascii=True)
+
+    def to_json(obj: Any) -> str:  # type: ignore
+        return orjson.dumps(obj).decode('utf-8')
+
+    from_json = orjson.loads  # type: ignore
+
+else:
+
+    def to_json(obj: Any) -> str:
+        return json.dumps(obj, separators=(',', ':'), ensure_ascii=True)
+
+    from_json = json.loads
 
 
 def _parse_ratelimit_header(request: Any, *, use_clock: bool = False) -> float:

setup.py

@@ -39,6 +39,9 @@ extras_require = {
         'sphinx==4.0.2',
         'sphinxcontrib_trio==1.1.2',
         'sphinxcontrib-websupport',
+    ],
+    'speed': [
+        'orjson>=3.5.4',
     ]
 }