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__author__ = "Konstantin Osipov <kostja.osipov@gmail.com>"
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
import sys
import ctypes
import errno
import re
import socket
import gc
from contextlib import contextmanager
import gevent
from gevent import socket as gsocket
from connpool import ConnectionPool
from test import TestRunGreenlet
class TarantoolPool(ConnectionPool):
def __init__(self, host, port, *args, **kwargs):
self.host = host
self.port = port
super(TarantoolPool, self).__init__(*args, **kwargs)
def _new_connection(self):
result = None
if self.host == 'unix/' or re.search(r'^/', str(self.port)):
result = gsocket.socket(gsocket.AF_UNIX, gsocket.SOCK_STREAM)
result.connect(self.port)
else:
result = gsocket.create_connection((self.host, self.port))
result.setsockopt(gsocket.SOL_TCP, gsocket.TCP_NODELAY, 1)
return result
def _addOne(self):
stime = 0.1
while True:
try:
c = self._new_connection()
except gsocket.error:
c = None
if c:
break
gevent.sleep(stime)
if stime < 400:
stime *= 2
self.conn.append(c)
self.lock.release()
@contextmanager
def get(self):
self.lock.acquire()
try:
c = self.conn.pop()
yield c
except self.exc_classes:
greenlet = TestRunGreenlet(self._addOne)
greenlet.start_later(1)
raise
except:
self.conn.append(c)
self.lock.release()
raise
else:
self.conn.append(c)
self.lock.release()
def close_all(self):
self.conn.clear()
class TarantoolConnection(object):
@property
def uri(self):
if self.host == 'unix/' or re.search(r'^/', str(self.port)):
return self.port
else:
return self.host+':'+str(self.port)
def __init__(self, host, port):
self.host = host
self.port = port
self.is_connected = False
def connect(self):
if self.host == 'unix/' or re.search(r'^/', str(self.port)):
self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.socket.connect(self.port)
else:
self.socket = socket.create_connection((self.host, self.port))
self.socket.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
self.is_connected = True
def disconnect(self):
if self.is_connected:
self.socket.close()
self.is_connected = False
def reconnect(self):
self.disconnect()
self.connect()
def opt_reconnect(self):
""" On a socket which was disconnected, recv of 0 bytes immediately
returns with no data. On a socket which is alive, it returns EAGAIN.
Make use of this property and detect whether or not the socket is
dead. Reconnect a dead socket, do nothing if the socket is good."""
try:
if not self.is_connected or self.socket.recv(
1, socket.MSG_DONTWAIT | socket.MSG_PEEK) == '':
self.reconnect()
except socket.error as e:
if e.errno == errno.EAGAIN:
pass
else:
self.reconnect()
def clone(self):
return type(self)(self.host, self.port)
def execute(self, command, silent=True):
self.opt_reconnect()
return self.execute_no_reconnect(command, silent)
def __enter__(self):
self.connect()
return self
def __exit__(self, type, value, tb):
self.disconnect()
def __call__(self, command, silent=False, simple=False):
return self.execute(command, silent)
class TarantoolAsyncConnection(TarantoolConnection):
pool = TarantoolPool
def __init__(self, host, port):
self.host = host
self.port = port
self.connections = None
self.is_connected = False
libc = ctypes.CDLL(ctypes.util.find_library('c'), use_errno=True)
self._sys_recv = libc.recv
@property
def socket(self):
with self.connections.get() as c:
result = c
return result
def connect(self):
self.connections = self.pool(self.host, self.port, 3)
self.is_connected = True
def disconnect(self):
if self.is_connected:
self.connections.close_all()
self.is_connected = False
def execute(self, command, silent=True):
return self.execute_no_reconnect(command, silent)
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