Merge pull request #37 from zopefoundation/TCP_NODELAY

TCP_NODELAY

src/ZEO/asyncio/base.py

 from struct import unpack
 import asyncio
 import logging
+import socket
+import sys
 
 from .marshal import encoder
 
 logger = logging.getLogger(__name__)
 
+INET_FAMILIES = socket.AF_INET, socket.AF_INET6
+
 class Protocol(asyncio.Protocol):
     """asyncio low-level ZEO base interface
     """
@@ -41,7 +45,15 @@ class Protocol(asyncio.Protocol):
 
     def connection_made(self, transport):
         logger.info("Connected %s", self)
+
+
+        if sys.version_info < (3, 6):
+            sock = transport.get_extra_info('socket')
+            if sock is not None and sock.family in INET_FAMILIES:
+                # See https://bugs.python.org/issue27456 :(
+                sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
         self.transport = transport
+
         paused = self.paused
         output = self.output
         append = output.append

src/ZEO/asyncio/testing.py

@@ -86,7 +86,7 @@ class Transport:
 
     capacity = 1 << 64
     paused = False
-    extra = dict(peername='1.2.3.4', sockname=('127.0.0.1', 4200))
+    extra = dict(peername='1.2.3.4', sockname=('127.0.0.1', 4200), socket=None)
 
     def __init__(self, protocol):
         self.data = []

src/ZEO/tests/InvalidationTests.py

@@ -324,8 +324,8 @@ class InvalidationTests:
 
     def checkConcurrentUpdates2Storages_emulated(self):
         self._storage = storage1 = self.openClientStorage()
-        storage2 = self.openClientStorage()
         db1 = DB(storage1)
+        storage2 = self.openClientStorage()
         db2 = DB(storage2)
 
         cn = db1.open()
@@ -349,8 +349,8 @@ class InvalidationTests:
 
     def checkConcurrentUpdates2Storages(self):
         self._storage = storage1 = self.openClientStorage()
-        storage2 = self.openClientStorage()
         db1 = DB(storage1)
+        storage2 = self.openClientStorage()
         db2 = DB(storage2)
         stop = threading.Event()