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Commit 8c4c5df6 authored by Yoshinori Okuji's avatar Yoshinori Okuji
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This is a significant rewrite of the client node, using multithreading-aware connections and epoll. 

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@156 71dcc9de-d417-0410-9af5-da40c76e7ee4
parent a89322a4
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Showing with 673 additions and 303 deletions
README
View file @ 8c4c5df6
......@@ -19,6 +19,16 @@ TODO
- Replication.
Requirements
- Python 2.4 or later
- ctypes http://python.net/crew/theller/ctypes/
- MySQLdb http://sourceforge.net/projects/mysql-python
- Zope 2.8 or later
Installation
1. In zope:
......@@ -50,4 +60,4 @@ Installation
from neo.client.NEOStorare import NEOStorage
s = NEOStorage(master_addr="127.0.0.1", master_port=10010, name="main")
...
\ No newline at end of file
...
neo/client/NEOStorage.py
View file @ 8c4c5df6
......@@ -28,22 +28,19 @@ class NEOStorage(BaseStorage.BaseStorage,
l = Lock()
self._txn_lock_acquire = l.acquire
self._txn_lock_release = l.release
# Create two queue for message between thread and dispatcher
# - message queue is for message that has to be send to other node
# through the dispatcher
# Create a queue for message between thread and dispatcher
# - request queue is for message receive from other node which have to
# be processed
message_queue = Queue()
request_queue = Queue()
# Create the event manager
em = EventManager()
# Create dispatcher thread
dispatcher = Dispatcher(em, message_queue, request_queue)
dispatcher = Dispatcher(em, request_queue)
dispatcher.setDaemon(True)
# Import here to prevent recursive import
from neo.client.app import Application
self.app = Application(master_nodes, name, em, dispatcher,
message_queue, request_queue)
request_queue)
# Connect to primary master node
dispatcher.connectToPrimaryMasterNode(self.app)
# Start dispatcher
......
neo/client/app.py
View file @ 8c4c5df6
This diff is collapsed.
neo/client/dispatcher.py
View file @ 8c4c5df6
......@@ -2,7 +2,7 @@ from threading import Thread
from Queue import Empty, Queue
from neo.protocol import PING, Packet, CLIENT_NODE_TYPE, FINISH_TRANSACTION
from neo.connection import ClientConnection
from neo.connection import MTClientConnection
from neo.node import MasterNode
from time import time
......@@ -11,9 +11,8 @@ import logging
class Dispatcher(Thread):
"""Dispatcher class use to redirect request to thread."""
def __init__(self, em, message_queue, request_queue, **kw):
def __init__(self, em, request_queue, **kw):
Thread.__init__(self, **kw)
self._message_queue = message_queue
self._request_queue = request_queue
self.em = em
# Queue of received packet that have to be processed
......@@ -29,51 +28,42 @@ class Dispatcher(Thread):
# First check if we receive any new message from other node
m = None
try:
self.em.poll(0.02)
self.em.poll()
except KeyError:
# This happen when there is no connection
logging.error('Dispatcher, run, poll returned a KeyError')
while 1:
try:
conn, packet = self.message.get_nowait()
conn, packet = self.message.get_nowait()
except Empty:
break
# Send message to waiting thread
key = "%s-%s" %(conn.getUUID(),packet.getId())
key = (conn.getUUID(), packet.getId())
#logging.info('dispatcher got packet %s' %(key,))
if self.message_table.has_key(key):
tmp_q = self.message_table.pop(key)
tmp_q.put((conn, packet), True)
if key in self.message_table:
queue = self.message_table.pop(key)
queue.put((conn, packet))
else:
#conn, packet = self.message
method_type = packet.getType()
if method_type == PING:
# must answer with no delay
conn.addPacket(Packet().pong(packet.getId()))
conn.lock()
try:
conn.addPacket(Packet().pong(packet.getId()))
finally:
conn.unlock()
else:
# put message in request queue
self._request_queue.put((conn, packet), True)
self._request_queue.put((conn, packet))
# Then check if a client ask me to send a message
try:
m = self._message_queue.get_nowait()
if m is not None:
tmp_q, msg_id, conn, p = m
conn.addPacket(p)
if tmp_q is not None:
# We expect an answer
key = "%s-%s" %(conn.getUUID(), msg_id)
self.message_table[key] = tmp_q
# XXX this is a hack. Probably queued tasks themselves
# should specify the timeout values.
if p.getType() == FINISH_TRANSACTION:
# Finish Transaction may take a lot of time when
# many objects are committed at a time.
conn.expectMessage(msg_id, additional_timeout = 300)
else:
conn.expectMessage(msg_id)
except Empty:
continue
def register(self, conn, msg_id, queue):
"""Register an expectation for a reply. Thanks to GIL, it is
safe not to use a lock here."""
key = (conn.getUUID(), msg_id)
self.message_table[key] = queue
def connectToPrimaryMasterNode(self, app):
"""Connect to a primary master node.
......@@ -87,7 +77,7 @@ class Dispatcher(Thread):
master_index = 0
conn = None
# Make application execute remaining message if any
app._waitMessage(block=0)
app._waitMessage()
handler = ClientEventHandler(app, app.dispatcher)
while 1:
if app.pt is not None and app.pt.operational():
......@@ -101,18 +91,24 @@ class Dispatcher(Thread):
else:
addr, port = app.primary_master_node.getServer()
# Request Node Identification
conn = ClientConnection(app.em, handler, (addr, port))
conn = MTClientConnection(app.em, handler, (addr, port))
if app.nm.getNodeByServer((addr, port)) is None:
n = MasterNode(server = (addr, port))
app.nm.add(n)
msg_id = conn.getNextId()
p = Packet()
p.requestNodeIdentification(msg_id, CLIENT_NODE_TYPE, app.uuid,
'0.0.0.0', 0, app.name)
# Send message
conn.addPacket(p)
conn.expectMessage(msg_id)
app.local_var.tmp_q = Queue(1)
conn.lock()
try:
msg_id = conn.getNextId()
p = Packet()
p.requestNodeIdentification(msg_id, CLIENT_NODE_TYPE, app.uuid,
'0.0.0.0', 0, app.name)
# Send message
conn.addPacket(p)
conn.expectMessage(msg_id)
finally:
conn.unlock()
# Wait for answer
while 1:
try:
......@@ -124,15 +120,19 @@ class Dispatcher(Thread):
break
# Check if we got a reply
try:
conn, packet = self.message.get_nowait()
conn, packet = self.message.get_nowait()
method_type = packet.getType()
if method_type == PING:
# Must answer with no delay
conn.addPacket(Packet().pong(packet.getId()))
break
else:
# Process message by handler
conn.handler.dispatch(conn, packet)
conn.lock()
try:
if method_type == PING:
# Must answer with no delay
conn.addPacket(Packet().pong(packet.getId()))
break
else:
# Process message by handler
conn.handler.dispatch(conn, packet)
finally:
conn.unlock()
except Empty:
pass
......@@ -156,15 +156,6 @@ class Dispatcher(Thread):
# Connected to primary master node
break
# If nothing, check if we have new message to send
try:
m = self._message_queue.get_nowait()
if m is not None:
tmp_q, msg_id, conn, p = m
conn.addPacket(p)
except Empty:
continue
logging.info("connected to primary master node %s %d" %app.primary_master_node.getServer())
app.master_conn = conn
self.connecting_to_master_node = 0
neo/client/handler.py
View file @ 8c4c5df6
import logging
from neo.handler import EventHandler
from neo.connection import ClientConnection
from neo.connection import MTClientConnection
from neo.protocol import Packet, \
MASTER_NODE_TYPE, STORAGE_NODE_TYPE, CLIENT_NODE_TYPE, \
INVALID_UUID, RUNNING_STATE, TEMPORARILY_DOWN_STATE, BROKEN_STATE
......@@ -74,7 +74,7 @@ class ClientEventHandler(EventHandler):
p.notifyNodeInformation(msg_id, node_list)
app.queue.put((None, msg_id, conn, p), True)
# Remove from pool connection
app.cm.removeConnection(node)
app.cp.removeConnection(node)
EventHandler.connectionClosed(self, conn)
def timeoutExpired(self, conn):
......@@ -98,7 +98,7 @@ class ClientEventHandler(EventHandler):
p.notifyNodeInformation(msg_id, node_list)
app.queue.put((None, msg_id, conn, p), True)
# Remove from pool connection
app.cm.removeConnection(node)
app.cp.removeConnection(node)
EventHandler.timeoutExpired(self, conn)
def peerBroken(self, conn):
......@@ -122,12 +122,12 @@ class ClientEventHandler(EventHandler):
p.notifyNodeInformation(msg_id, node_list)
app.queue.put((None, msg_id, conn, p), True)
# Remove from pool connection
app.cm.removeConnection(node)
app.cp.removeConnection(node)
EventHandler.peerBroken(self, conn)
def handleNotReady(self, conn, packet, message):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
app.node_not_ready = 1
else:
......@@ -136,7 +136,7 @@ class ClientEventHandler(EventHandler):
def handleAcceptNodeIdentification(self, conn, packet, node_type,
uuid, ip_address, port,
num_partitions, num_replicas):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
node = app.nm.getNodeByServer(conn.getAddress())
# It can be eiter a master node or a storage node
......@@ -162,12 +162,18 @@ class ClientEventHandler(EventHandler):
app.pt = PartitionTable(num_partitions, num_replicas)
app.num_partitions = num_partitions
app.num_replicas = num_replicas
# Ask a primary master.
msg_id = conn.getNextId()
p = Packet()
p.askPrimaryMaster(msg_id)
# send message to dispatcher
app.queue.put((app.local_var.tmp_q, msg_id, conn, p), True)
conn.lock()
try:
msg_id = conn.getNextId()
p = Packet()
p.askPrimaryMaster(msg_id)
conn.addPacket(p)
conn.expectMessage(msg_id)
app.dispatcher.register(conn, msg_id, app.getQueue())
finally:
conn.unlock()
elif node_type == STORAGE_NODE_TYPE:
app.storage_node = node
else:
......@@ -176,7 +182,7 @@ class ClientEventHandler(EventHandler):
# Master node handler
def handleAnswerPrimaryMaster(self, conn, packet, primary_uuid, known_master_list):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
......@@ -220,7 +226,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleSendPartitionTable(self, conn, packet, ptid, row_list):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
......@@ -249,7 +255,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleNotifyNodeInformation(self, conn, packet, node_list):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
uuid = conn.getUUID()
if uuid is None:
self.handleUnexpectedPacket(conn, packet)
......@@ -309,7 +315,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleNotifyPartitionChanges(self, conn, packet, ptid, cell_list):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
nm = app.nm
pt = app.pt
......@@ -344,14 +350,14 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleAnswerNewTID(self, conn, packet, tid):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
app.tid = tid
else:
self.handleUnexpectedPacket(conn, packet)
def handleNotifyTransactionFinished(self, conn, packet, tid):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
if tid != app.tid:
app.txn_finished = -1
......@@ -361,7 +367,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleInvalidateObjects(self, conn, packet, oid_list):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
app._cache_lock_acquire()
try:
......@@ -379,7 +385,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleAnswerNewOIDs(self, conn, packet, oid_list):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
app.new_oid_list = oid_list
app.new_oid_list.reverse()
......@@ -387,7 +393,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleStopOperation(self, conn, packet):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
logging.critical("master node ask to stop operation")
else:
self.handleUnexpectedPacket(conn, packet)
......@@ -396,7 +402,7 @@ class ClientEventHandler(EventHandler):
# Storage node handler
def handleAnswerObject(self, conn, packet, oid, start_serial, end_serial, compression,
checksum, data):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
app.local_var.asked_object = (oid, start_serial, end_serial, compression,
checksum, data)
......@@ -404,7 +410,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleAnswerStoreObject(self, conn, packet, conflicting, oid, serial):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
if conflicting:
app.txn_object_stored = -1, serial
......@@ -414,14 +420,14 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleAnswerStoreTransaction(self, conn, packet, tid):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
app.txn_voted = 1
else:
self.handleUnexpectedPacket(conn, packet)
def handleAnswerTransactionInformation(self, conn, packet, tid, user, desc, oid_list):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
# transaction information are returned as a dict
info = {}
......@@ -435,7 +441,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleAnswerObjectHistory(self, conn, packet, oid, history_list):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
# history_list is a list of tuple (serial, size)
self.history = oid, history_list
......@@ -443,7 +449,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleOidNotFound(self, conn, packet, message):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
# This can happen either when :
# - loading an object
......@@ -454,7 +460,7 @@ class ClientEventHandler(EventHandler):
self.handleUnexpectedPacket(conn, packet)
def handleTidNotFound(self, conn, packet, message):
if isinstance(conn, ClientConnection):
if isinstance(conn, MTClientConnection):
app = self.app
# This can happen when requiring txn informations
app.local_var.txn_info = -1
......
neo/connection.py
View file @ 8c4c5df6
import socket
import errno
import logging
from threading import RLock
from neo.protocol import Packet, ProtocolError
from neo.event import IdleEvent
......@@ -46,6 +47,12 @@ class BaseConnection(object):
def getUUID(self):
return None
def acquire(self, block = 1):
return 1
def release(self):
pass
class ListeningConnection(BaseConnection):
"""A listen connection."""
def __init__(self, event_manager, handler, addr = None, **kw):
......@@ -305,3 +312,31 @@ class ClientConnection(Connection):
class ServerConnection(Connection):
"""A connection from a remote node to this node."""
pass
class MTClientConnection(ClientConnection):
"""A Multithread-safe version of ClientConnection."""
def __init__(self, *args, **kwargs):
super(MTClientConnection, self).__init__(*args, **kwargs)
lock = RLock()
self.acquire = lock.acquire
self.release = lock.release
def lock(self, blocking = 1):
return self.acquire(blocking = blocking)
def unlock(self):
self.release()
class MTServerConnection(ServerConnection):
"""A Multithread-safe version of ServerConnection."""
def __init__(self, *args, **kwargs):
super(MTClientConnection, self).__init__(*args, **kwargs)
lock = RLock()
self.acquire = lock.acquire
self.release = lock.release
def lock(self, blocking = 1):
return self.acquire(blocking = blocking)
def unlock(self):
self.release()
neo/epoll.py 0 → 100644
View file @ 8c4c5df6
r"""This is an epoll(4) interface available in Linux 2.6. This requires
ctypes <http://python.net/crew/theller/ctypes/>."""
from ctypes import cdll, Union, Structure, \
c_void_p, c_int, byref
try:
from ctypes import c_uint32, c_uint64
except ImportError:
from ctypes import c_uint, c_ulonglong
c_uint32 = c_uint
c_uint64 = c_ulonglong
from os import close
from errno import EINTR
libc = cdll.LoadLibrary('libc.so.6')
epoll_create = libc.epoll_create
epoll_wait = libc.epoll_wait
epoll_ctl = libc.epoll_ctl
errno = c_int.in_dll(libc, 'errno')
EPOLLIN = 0x001
EPOLLPRI = 0x002
EPOLLOUT = 0x004
EPOLLRDNORM = 0x040
EPOLLRDBAND = 0x080
EPOLLWRNORM = 0x100
EPOLLWRBAND = 0x200
EPOLLMSG = 0x400
EPOLLERR = 0x008
EPOLLHUP = 0x010
EPOLLONESHOT = (1 << 30)
EPOLLET = (1 << 31)
EPOLL_CTL_ADD = 1
EPOLL_CTL_DEL = 2
EPOLL_CTL_MOD = 3
class epoll_data(Union):
_fields_ = [("ptr", c_void_p),
("fd", c_int),
("u32", c_uint32),
("u64", c_uint64)]
class epoll_event(Structure):
_fields_ = [("events", c_uint32),
("data", epoll_data)]
class Epoll(object):
efd = -1
def __init__(self):
self.efd = epoll_create(10)
if self.efd == -1:
raise OSError(errno.value, 'epoll_create failed')
self.maxevents = 1024 # XXX arbitrary
epoll_event_array = epoll_event * self.maxevents
self.events = epoll_event_array()
def poll(self, timeout = 1):
timeout *= 1000
timeout = int(timeout)
while 1:
n = epoll_wait(self.efd, byref(self.events), self.maxevents,
timeout)
if n == -1:
e = errno.value
if e == EINTR:
continue
else:
raise OSError(e, 'epoll_wait failed')
else:
readable_fd_list = []
writable_fd_list = []
for i in xrange(n):
ev = self.events[i]
if ev.events & (EPOLLIN | EPOLLERR | EPOLLHUP):
readable_fd_list.append(int(ev.data.fd))
elif ev.events & (EPOLLOUT | EPOLLERR | EPOLLHUP):
writable_fd_list.append(int(ev.data.fd))
return readable_fd_list, writable_fd_list
def register(self, fd):
ev = epoll_event()
ev.data.fd = fd
ret = epoll_ctl(self.efd, EPOLL_CTL_ADD, fd, byref(ev))
if ret == -1:
raise OSError(errno.value, 'epoll_ctl failed')
def modify(self, fd, readable, writable):
ev = epoll_event()
ev.data.fd = fd
events = 0
if readable:
events |= EPOLLIN
if writable:
events |= EPOLLOUT
ev.events = events
ret = epoll_ctl(self.efd, EPOLL_CTL_MOD, fd, byref(ev))
if ret == -1:
raise OSError(errno.value, 'epoll_ctl failed')
def unregister(self, fd):
ev = epoll_event()
ret = epoll_ctl(self.efd, EPOLL_CTL_DEL, fd, byref(ev))
if ret == -1:
raise OSError(errno.value, 'epoll_ctl failed')
def __del__(self):
if self.efd >= 0:
close(self.efd)
neo/event.py
View file @ 8c4c5df6
......@@ -3,6 +3,7 @@ from select import select
from time import time
from neo.protocol import Packet
from neo.epoll import Epoll
class IdleEvent(object):
"""This class represents an event called when a connection is waiting for
......@@ -28,26 +29,35 @@ class IdleEvent(object):
def __call__(self, t):
conn = self._conn
if t > self._critical_time:
logging.info('timeout with %s:%d', *(conn.getAddress()))
conn.getHandler().timeoutExpired(conn)
conn.close()
return True
conn.lock()
try:
logging.info('timeout with %s:%d', *(conn.getAddress()))
conn.getHandler().timeoutExpired(conn)
conn.close()
return True
finally:
conn.unlock()
elif t > self._time:
if self._additional_timeout > 5:
self._additional_timeout -= 5
conn.expectMessage(self._id, 5, self._additional_timeout)
# Start a keep-alive packet.
logging.info('sending a ping to %s:%d', *(conn.getAddress()))
msg_id = conn.getNextId()
conn.addPacket(Packet().ping(msg_id))
conn.expectMessage(msg_id, 5, 0)
else:
conn.expectMessage(self._id, self._additional_timeout, 0)
return True
conn.lock()
try:
if self._additional_timeout > 5:
self._additional_timeout -= 5
conn.expectMessage(self._id, 5, self._additional_timeout)
# Start a keep-alive packet.
logging.info('sending a ping to %s:%d',
*(conn.getAddress()))
msg_id = conn.getNextId()
conn.addPacket(Packet().ping(msg_id))
conn.expectMessage(msg_id, 5, 0)
else:
conn.expectMessage(self._id, self._additional_timeout, 0)
return True
finally:
conn.unlock()
return False
class EventManager(object):
"""This class manages connections and events."""
class SelectEventManager(object):
"""This class manages connections and events based on select(2)."""
def __init__(self):
self.connection_dict = {}
......@@ -71,13 +81,21 @@ class EventManager(object):
timeout)
for s in rlist:
conn = self.connection_dict[s]
conn.readable()
conn.lock()
try:
conn.readable()
finally:
conn.unlock()
for s in wlist:
# This can fail, if a connection is closed in readable().
try:
conn = self.connection_dict[s]
conn.writable()
conn.lock()
try:
conn.writable()
finally:
conn.unlock()
except KeyError:
pass
......@@ -120,3 +138,102 @@ class EventManager(object):
def removeWriter(self, conn):
self.writer_set.discard(conn.getSocket())
class EpollEventManager(object):
"""This class manages connections and events based on epoll(5)."""
def __init__(self):
self.connection_dict = {}
self.reader_set = set([])
self.writer_set = set([])
self.event_list = []
self.prev_time = time()
self.epoll = Epoll()
def getConnectionList(self):
return self.connection_dict.values()
def register(self, conn):
fd = conn.getSocket().fileno()
self.connection_dict[fd] = conn
self.epoll.register(fd)
def unregister(self, conn):
fd = conn.getSocket().fileno()
self.epoll.unregister(fd)
del self.connection_dict[fd]
def poll(self, timeout = 1):
rlist, wlist = self.epoll.poll(timeout)
for fd in rlist:
conn = self.connection_dict[fd]
conn.lock()
try:
conn.readable()
finally:
conn.unlock()
for fd in wlist:
# This can fail, if a connection is closed in readable().
try:
conn = self.connection_dict[fd]
conn.lock()
try:
conn.writable()
finally:
conn.unlock()
except KeyError:
pass
# Check idle events. Do not check them out too often, because this
# is somehow heavy.
event_list = self.event_list
if event_list:
t = time()
if t - self.prev_time >= 1:
self.prev_time = t
event_list.sort(key = lambda event: event.getTime())
while event_list:
event = event_list[0]
if event(t):
try:
event_list.remove(event)
except ValueError:
pass
else:
break
def addIdleEvent(self, event):
self.event_list.append(event)
def removeIdleEvent(self, event):
try:
self.event_list.remove(event)
except ValueError:
pass
def addReader(self, conn):
fd = conn.getSocket().fileno()
if fd not in self.reader_set:
self.reader_set.add(fd)
self.epoll.modify(fd, 1, fd in self.writer_set)
def removeReader(self, conn):
fd = conn.getSocket().fileno()
if fd in self.reader_set:
self.reader_set.remove(fd)
self.epoll.modify(fd, 0, fd in self.writer_set)
def addWriter(self, conn):
fd = conn.getSocket().fileno()
if fd not in self.writer_set:
self.writer_set.add(fd)
self.epoll.modify(fd, fd in self.reader_set, 1)
def removeWriter(self, conn):
fd = conn.getSocket().fileno()
if fd in self.writer_set:
self.writer_set.remove(fd)
self.epoll.modify(fd, fd in self.reader_set, 0)
# Default to EpollEventManager.
EventManager = EpollEventManager
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