Replace OSError exceptions from can_read with redis.ConnectionError (#2140)

* Replace OSError exceptions from `can_read` with `redis.ConnectionError`

* Fix formatting

* Revert unintended formatting change

Author: kristjanvalur

redis/asyncio/connection.py

@@ -911,7 +911,13 @@ async def can_read(self, timeout: float = 0):
         """Poll the socket to see if there's data that can be read."""
         if not self.is_connected:
             await self.connect()
-        return await self._parser.can_read(timeout)
+        try:
+            return await self._parser.can_read(timeout)
+        except OSError as e:
+            await self.disconnect()
+            raise ConnectionError(
+                f"Error while reading from {self.host}:{self.port}: {e.args}"
+            )
 
     async def read_response(self, disable_decoding: bool = False):
         """Read the response from a previously sent command"""

redis/connection.py

@@ -808,7 +808,13 @@ def can_read(self, timeout=0):
         sock = self._sock
         if not sock:
             self.connect()
-        return self._parser.can_read(timeout)
+        try:
+            return self._parser.can_read(timeout)
+        except OSError as e:
+            self.disconnect()
+            raise ConnectionError(
+                f"Error while reading from {self.host}:{self.port}: {e.args}"
+            )
 
     def read_response(self, disable_decoding=False):
         """Read the response from a previously sent command"""