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from exceptions import Exception
import socket
import time
import pool
from thrift import Thrift
from thrift.transport import TTransport
from thrift.transport import TSocket
from thrift.protocol import TBinaryProtocol
from pycassa.cassandra import Cassandra
from pycassa.cassandra.constants import VERSION
from pycassa.cassandra.ttypes import AuthenticationRequest
__all__ = ['connect', 'connect_thread_local']
DEFAULT_SERVER = 'localhost:9160'
DEFAULT_PORT = 9160
LOWEST_COMPATIBLE_VERSION = 17
class Connection(Cassandra.Client):
"""Encapsulation of a client session."""
def __init__(self, keyspace, server, framed_transport=True, timeout=None, credentials=None):
self.server = server
server = server.split(':')
if len(server) <= 1:
port = 9160
else:
port = server[1]
host = server[0]
socket = TSocket.TSocket(host, int(port))
if timeout is not None:
socket.setTimeout(timeout*1000.0)
if framed_transport:
self.transport = TTransport.TFramedTransport(socket)
else:
self.transport = TTransport.TBufferedTransport(socket)
protocol = TBinaryProtocol.TBinaryProtocolAccelerated(self.transport)
super(Connection, self).__init__(protocol)
self.transport.open()
server_api_version = int(self.describe_version().split('.', 1)[0])
assert (server_api_version >= LOWEST_COMPATIBLE_VERSION), \
"Thrift API version incompatibility. " \
"(Server: %s, Lowest compatible version: %d)" % (server_api_version, LOWEST_COMPATIBLE_VERSION)
if keyspace is not None:
self.set_keyspace(keyspace)
self.keyspace = keyspace
if credentials is not None:
request = AuthenticationRequest(credentials=credentials)
self.login(request)
def set_keyspace(self, keyspace):
self.keyspace = keyspace
super(Connection, self).set_keyspace(keyspace)
def close(self):
self.transport.close()
def connect(keyspace, servers=None, framed_transport=True, timeout=None,
credentials=None, retry_time=60, recycle=None, use_threadlocal=True):
"""
Constructs a :class:`~pycassa.pool.ConnectionPool`. This is primarily available
for reasons of backwards-compatibility; creating a ConnectionPool directly
provides more options. All of the parameters here correspond directly
with parameters of the same name in
:meth:`pycassa.pool.ConnectionPool.__init__()`
"""
if servers is None:
servers = [DEFAULT_SERVER]
return pool.ConnectionPool(keyspace=keyspace, server_list=servers,
credentials=credentials, timeout=timeout,
use_threadlocal=use_threadlocal, prefill=False,
pool_size=len(servers), max_overflow=len(servers),
max_retries=len(servers))
def connect_thread_local(*args, **kwargs):
""" Alias of :meth:`connect` """
return connect(*args, **kwargs)
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