Socket errors with asyncio.start_unix_server and redis

I'm attempting to build a toy in-memory Redis server in Python using asyncio and Unix domain sockets.

My minimal example just returns the value baz for every request:

import asyncio


class RedisServer:
    def __init__(self):
        self.server_address = "/tmp/redis.sock"

    async def handle_req(self, reader, writer):
        await reader.readline()
        writer.write(b"$3\r\nbaz\r\n")
        await writer.drain()
        writer.close()
        await writer.wait_closed()

    async def main(self):
        server = await asyncio.start_unix_server(self.handle_req, self.server_address)
        async with server:
            await server.serve_forever()

    def run(self):
        asyncio.run(self.main())


RedisServer().run()

When I test two sequential client requests with the redis client library with the following script, it works:

import time
import redis


r = redis.Redis(unix_socket_path="/tmp/redis.sock")

r.get("foo")
time.sleep(1)
r.get("bar")

However, if I remove the time.sleep(1), sometimes it works, and sometimes the second request fails fails with either:

Traceback (most recent call last):
  File "/tmp/env/lib/python3.8/site-packages/redis/connection.py", line 706, in send_packed_command
    sendall(self._sock, item)
  File "/tmp/env/lib/python3.8/site-packages/redis/_compat.py", line 9, in sendall
    return sock.sendall(*args, **kwargs)
BrokenPipeError: [Errno 32] Broken pipe

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 9, in <module>
    r.get("bar")
  File "/tmp/env/lib/python3.8/site-packages/redis/client.py", line 1606, in get
    return self.execute_command('GET', name)
  File "/tmp/env/lib/python3.8/site-packages/redis/client.py", line 900, in execute_command
    conn.send_command(*args)
  File "/tmp/env/lib/python3.8/site-packages/redis/connection.py", line 725, in send_command
    self.send_packed_command(self.pack_command(*args),
  File "/tmp/env/lib/python3.8/site-packages/redis/connection.py", line 717, in send_packed_command
    raise ConnectionError("Error %s while writing to socket. %s." %
redis.exceptions.ConnectionError: Error 32 while writing to socket. Broken pipe.

Or:

Traceback (most recent call last):
  File "test.py", line 9, in <module>
    r.get("bar")
  File "/tmp/env/lib/python3.8/site-packages/redis/client.py", line 1606, in get
    return self.execute_command('GET', name)
  File "/tmp/env/lib/python3.8/site-packages/redis/client.py", line 901, in execute_command
    return self.parse_response(conn, command_name, **options)
  File "/tmp/env/lib/python3.8/site-packages/redis/client.py", line 915, in parse_response
    response = connection.read_response()
  File "/tmp/env/lib/python3.8/site-packages/redis/connection.py", line 739, in read_response
    response = self._parser.read_response()
  File "/tmp/env/lib/python3.8/site-packages/redis/connection.py", line 324, in read_response
    raw = self._buffer.readline()
  File "/tmp/env/lib/python3.8/site-packages/redis/connection.py", line 256, in readline
    self._read_from_socket()
  File "/tmp/env/lib/python3.8/site-packages/redis/connection.py", line 201, in _read_from_socket
    raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
redis.exceptions.ConnectionError: Connection closed by server.

It seems like my implementation is missing some critical behavior that the client library expects (probably due to it being async). What am I missing?

from Socket errors with asyncio.start_unix_server and redis