Set TCP_NODELAY (#1122)

This yields a small performance improvement by disabling Nagle's algorithm on
the TCP sockets.

The change only affects the synchronous driver as most async runtime
implementations already set this socket option for us.

Author: robsdedude

src/neo4j/_async_compat/network/_bolt_socket.py

@@ -17,6 +17,7 @@
 from __future__ import annotations
 
 import asyncio
+import errno
 import logging
 import struct
 import typing as t
@@ -29,10 +30,12 @@
 from socket import (
     AF_INET,
     AF_INET6,
+    IPPROTO_TCP,
     SHUT_RDWR,
     SO_KEEPALIVE,
     socket,
     SOL_SOCKET,
+    TCP_NODELAY,
     timeout as SocketTimeout,  # noqa: N812 (it is a class)
 )
 # isort: on
@@ -548,6 +551,12 @@ def _connect(cls, resolved_address, timeout, keep_alive):
                 s = socket(AF_INET6)
             else:
                 raise ValueError(f"Unsupported address {resolved_address!r}")
+            try:
+                s.setsockopt(IPPROTO_TCP, TCP_NODELAY, 1)
+            except OSError as e:
+                # option might not be supported on all platforms
+                if e.errno != errno.ENOPROTOOPT:
+                    raise
             t = s.gettimeout()
             if timeout:
                 s.settimeout(timeout)