139 lines
4.2 KiB
Python
139 lines
4.2 KiB
Python
# Copyright 2013-2017 DataStax, Inc.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
import gevent
|
|
import gevent.event
|
|
from gevent.queue import Queue
|
|
from gevent import socket
|
|
import gevent.ssl
|
|
|
|
import logging
|
|
import time
|
|
|
|
from six.moves import range
|
|
|
|
from cassandra.connection import Connection, ConnectionShutdown, Timer, TimerManager
|
|
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class GeventConnection(Connection):
|
|
"""
|
|
An implementation of :class:`.Connection` that utilizes ``gevent``.
|
|
|
|
This implementation assumes all gevent monkey patching is active. It is not tested with partial patching.
|
|
"""
|
|
|
|
_read_watcher = None
|
|
_write_watcher = None
|
|
|
|
_socket_impl = gevent.socket
|
|
_ssl_impl = gevent.ssl
|
|
|
|
_timers = None
|
|
_timeout_watcher = None
|
|
_new_timer = None
|
|
|
|
@classmethod
|
|
def initialize_reactor(cls):
|
|
if not cls._timers:
|
|
cls._timers = TimerManager()
|
|
cls._timeout_watcher = gevent.spawn(cls.service_timeouts)
|
|
cls._new_timer = gevent.event.Event()
|
|
|
|
@classmethod
|
|
def create_timer(cls, timeout, callback):
|
|
timer = Timer(timeout, callback)
|
|
cls._timers.add_timer(timer)
|
|
cls._new_timer.set()
|
|
return timer
|
|
|
|
@classmethod
|
|
def service_timeouts(cls):
|
|
timer_manager = cls._timers
|
|
timer_event = cls._new_timer
|
|
while True:
|
|
next_end = timer_manager.service_timeouts()
|
|
sleep_time = max(next_end - time.time(), 0) if next_end else 10000
|
|
timer_event.wait(sleep_time)
|
|
timer_event.clear()
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
Connection.__init__(self, *args, **kwargs)
|
|
|
|
self._write_queue = Queue()
|
|
|
|
self._connect_socket()
|
|
|
|
self._read_watcher = gevent.spawn(self.handle_read)
|
|
self._write_watcher = gevent.spawn(self.handle_write)
|
|
self._send_options_message()
|
|
|
|
def close(self):
|
|
with self.lock:
|
|
if self.is_closed:
|
|
return
|
|
self.is_closed = True
|
|
|
|
log.debug("Closing connection (%s) to %s" % (id(self), self.host))
|
|
if self._read_watcher:
|
|
self._read_watcher.kill(block=False)
|
|
if self._write_watcher:
|
|
self._write_watcher.kill(block=False)
|
|
if self._socket:
|
|
self._socket.close()
|
|
log.debug("Closed socket to %s" % (self.host,))
|
|
|
|
if not self.is_defunct:
|
|
self.error_all_requests(
|
|
ConnectionShutdown("Connection to %s was closed" % self.host))
|
|
# don't leave in-progress operations hanging
|
|
self.connected_event.set()
|
|
|
|
def handle_close(self):
|
|
log.debug("connection closed by server")
|
|
self.close()
|
|
|
|
def handle_write(self):
|
|
while True:
|
|
try:
|
|
next_msg = self._write_queue.get()
|
|
self._socket.sendall(next_msg)
|
|
except socket.error as err:
|
|
log.debug("Exception in send for %s: %s", self, err)
|
|
self.defunct(err)
|
|
return
|
|
|
|
def handle_read(self):
|
|
while True:
|
|
try:
|
|
buf = self._socket.recv(self.in_buffer_size)
|
|
self._iobuf.write(buf)
|
|
except socket.error as err:
|
|
log.debug("Exception in read for %s: %s", self, err)
|
|
self.defunct(err)
|
|
return # leave the read loop
|
|
|
|
if buf and self._iobuf.tell():
|
|
self.process_io_buffer()
|
|
else:
|
|
log.debug("Connection %s closed by server", self)
|
|
self.close()
|
|
return
|
|
|
|
def push(self, data):
|
|
chunk_size = self.out_buffer_size
|
|
for i in range(0, len(data), chunk_size):
|
|
self._write_queue.put(data[i:i + chunk_size])
|