725 lines
20 KiB
Python
725 lines
20 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from collections import namedtuple, OrderedDict
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import datetime
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import socket
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import types
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from uuid import UUID
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO # ignore flake8 warning: # NOQA
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from cassandra import ConsistencyLevel
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from cassandra.marshal import (int32_pack, int32_unpack, uint16_pack, uint16_unpack,
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int8_pack, int8_unpack)
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from cassandra.cqltypes import lookup_cqltype
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class NotSupportedError(Exception):
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pass
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class InternalError(Exception):
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pass
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PROTOCOL_VERSION = 0x01
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PROTOCOL_VERSION_MASK = 0x7f
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HEADER_DIRECTION_FROM_CLIENT = 0x00
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HEADER_DIRECTION_TO_CLIENT = 0x80
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HEADER_DIRECTION_MASK = 0x80
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def warn(msg):
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print msg
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def tuple_factory(colnames, rows):
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return rows
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def named_tuple_factory(colnames, rows):
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Row = namedtuple('Row', colnames)
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return [Row(*row) for row in rows]
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def dict_factory(colnames, rows):
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return [dict(zip(colnames, row)) for row in rows]
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def ordered_dict_factory(colnames, rows):
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return [OrderedDict(zip(colnames, row)) for row in rows]
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class PreparedResult:
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def __init__(self, queryid, param_metadata):
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self.queryid = queryid
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self.param_metadata = param_metadata
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def __str__(self):
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return '<PreparedResult: queryid=%r, column_metadata=%r>' \
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% (self.queryid, self.column_metadata)
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__repr__ = __str__
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_message_types_by_name = {}
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_message_types_by_opcode = {}
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class _register_msg_type(type):
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def __init__(cls, name, bases, dct):
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if not name.startswith('_'):
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_message_types_by_name[cls.name] = cls
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_message_types_by_opcode[cls.opcode] = cls
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class _MessageType(object):
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__metaclass__ = _register_msg_type
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params = ()
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def __init__(self, **kwargs):
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for pname in self.params:
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try:
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pval = kwargs[pname]
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except KeyError:
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raise ValueError("%s instances need the %s keyword parameter"
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% (self.__class__.__name__, pname))
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setattr(self, pname, pval)
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def to_string(self, stream_id, compression=None):
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body = StringIO()
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self.send_body(body)
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body = body.getvalue()
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version = PROTOCOL_VERSION | HEADER_DIRECTION_FROM_CLIENT
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flags = 0
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if compression is not None and len(body) > 0:
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body = compression(body)
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flags |= 0x1
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msglen = int32_pack(len(body))
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msg_parts = map(int8_pack, (version, flags, stream_id, self.opcode)) + [msglen, body]
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return ''.join(msg_parts)
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def send(self, f, streamid, compression=None):
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body = StringIO()
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self.send_body(body)
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body = body.getvalue()
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version = PROTOCOL_VERSION | HEADER_DIRECTION_FROM_CLIENT
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flags = 0
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if compression is not None and len(body) > 0:
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body = compression(body)
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flags |= 0x1
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msglen = int32_pack(len(body))
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header = ''.join(map(int8_pack, (version, flags, streamid, self.opcode))) \
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+ msglen
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f.write(header)
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if len(body) > 0:
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f.write(body)
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def __str__(self):
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paramstrs = ['%s=%r' % (pname, getattr(self, pname)) for pname in self.params]
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return '<%s(%s)>' % (self.__class__.__name__, ', '.join(paramstrs))
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__repr__ = __str__
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def decode_response(stream_id, flags, opcode, body, decompressor=None):
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if flags & 0x1:
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if decompressor is None:
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raise Exception("No decompressor available for compressed frame!")
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body = decompressor(body)
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flags ^= 0x1
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if flags:
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warn("Unknown protocol flags set: %02x. May cause problems." % flags)
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msg_class = _message_types_by_opcode[opcode]
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msg = msg_class.recv_body(StringIO(body))
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msg.stream_id = stream_id
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return msg
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error_classes = {}
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class ErrorMessage(_MessageType, Exception):
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opcode = 0x00
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name = 'ERROR'
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params = ('code', 'message', 'info')
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summary = 'Unknown'
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@classmethod
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def recv_body(cls, f):
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code = read_int(f)
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msg = read_string(f)
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subcls = error_classes.get(code, cls)
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extra_info = subcls.recv_error_info(f)
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return subcls(code=code, message=msg, info=extra_info)
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def summary_msg(self):
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msg = 'code=%04x [%s] message="%s"' \
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% (self.code, self.summary, self.message)
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if self.info is not None:
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msg += (' info=' + str(self.info))
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return msg
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def __str__(self):
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return '<ErrorMessage %s>' % self.summary_msg()
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__repr__ = __str__
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@staticmethod
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def recv_error_info(f):
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pass
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class ErrorMessageSubclass(_register_msg_type):
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def __init__(cls, name, bases, dct):
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if cls.error_code is not None:
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error_classes[cls.error_code] = cls
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class ErrorMessageSub(ErrorMessage):
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__metaclass__ = ErrorMessageSubclass
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error_code = None
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class RequestExecutionException(ErrorMessageSub):
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pass
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class RequestValidationException(ErrorMessageSub):
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pass
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class ServerError(ErrorMessageSub):
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summary = 'Server error'
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error_code = 0x0000
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class ProtocolException(ErrorMessageSub):
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summary = 'Protocol error'
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error_code = 0x000A
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class UnavailableErrorMessage(RequestExecutionException):
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summary = 'Unavailable exception'
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error_code = 0x1000
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@staticmethod
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def recv_error_info(f):
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return {
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'consistency': read_consistency_level(f),
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'required_replicas': read_int(f),
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'alive_replicas': read_int(f),
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}
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class OverloadedErrorMessage(RequestExecutionException):
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summary = 'Coordinator node overloaded'
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error_code = 0x1001
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class IsBootstrappingErrorMessage(RequestExecutionException):
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summary = 'Coordinator node is bootstrapping'
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error_code = 0x1002
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class TruncateError(RequestExecutionException):
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summary = 'Error during truncate'
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error_code = 0x1003
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class RequestTimeoutException(RequestExecutionException):
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pass
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class WriteTimeoutErrorMessage(RequestTimeoutException):
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summary = 'Timeout during write request'
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error_code = 0x1100
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@staticmethod
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def recv_error_info(f):
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return {
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'consistency': read_consistency_level(f),
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'received_responses': read_int(f),
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'required_responses': read_int(f),
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'write_type': read_string(f),
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}
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class ReadTimeoutErrorMessage(RequestTimeoutException):
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summary = 'Timeout during read request'
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error_code = 0x1200
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@staticmethod
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def recv_error_info(f):
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return {
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'consistency': read_consistency_level(f),
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'received_responses': read_int(f),
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'required_responses': read_int(f),
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'data_retrieved': bool(read_byte(f)),
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}
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class SyntaxException(RequestValidationException):
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summary = 'Syntax error in CQL query'
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error_code = 0x2000
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class UnauthorizedErrorMessage(RequestValidationException):
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summary = 'Unauthorized'
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error_code = 0x2100
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class InvalidRequestException(RequestValidationException):
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summary = 'Invalid query'
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error_code = 0x2200
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class ConfigurationException(RequestValidationException):
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summary = 'Query invalid because of configuration issue'
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error_code = 0x2300
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class AlreadyExistsException(ConfigurationException):
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summary = 'Item already exists'
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error_code = 0x2400
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@staticmethod
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def recv_error_info(f):
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return {
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'keyspace': read_string(f),
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'table': read_string(f),
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}
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class StartupMessage(_MessageType):
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opcode = 0x01
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name = 'STARTUP'
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params = ('cqlversion', 'options')
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KNOWN_OPTION_KEYS = set((
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'CQL_VERSION',
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'COMPRESSION',
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))
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def send_body(self, f):
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optmap = self.options.copy()
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optmap['CQL_VERSION'] = self.cqlversion
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write_stringmap(f, optmap)
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class ReadyMessage(_MessageType):
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opcode = 0x02
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name = 'READY'
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params = ()
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@classmethod
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def recv_body(cls, f):
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return cls()
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class AuthenticateMessage(_MessageType):
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opcode = 0x03
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name = 'AUTHENTICATE'
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params = ('authenticator',)
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@classmethod
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def recv_body(cls, f):
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authname = read_string(f)
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return cls(authenticator=authname)
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class CredentialsMessage(_MessageType):
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opcode = 0x04
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name = 'CREDENTIALS'
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params = ('creds',)
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def send_body(self, f):
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write_short(f, len(self.creds))
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for credkey, credval in self.creds:
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write_string(f, credkey)
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write_string(f, credval)
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class OptionsMessage(_MessageType):
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opcode = 0x05
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name = 'OPTIONS'
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params = ()
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def send_body(self, f):
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pass
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class SupportedMessage(_MessageType):
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opcode = 0x06
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name = 'SUPPORTED'
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params = ('cql_versions', 'options',)
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@classmethod
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def recv_body(cls, f):
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options = read_stringmultimap(f)
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cql_versions = options.pop('CQL_VERSION')
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return cls(cql_versions=cql_versions, options=options)
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class QueryMessage(_MessageType):
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opcode = 0x07
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name = 'QUERY'
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params = ('query', 'consistency_level',)
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def send_body(self, f):
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write_longstring(f, self.query)
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write_consistency_level(f, self.consistency_level)
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class ResultMessage(_MessageType):
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opcode = 0x08
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name = 'RESULT'
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params = ('kind', 'results',)
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KIND_VOID = 0x0001
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KIND_ROWS = 0x0002
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KIND_SET_KEYSPACE = 0x0003
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KIND_PREPARED = 0x0004
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KIND_SCHEMA_CHANGE = 0x0005
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type_codes = {
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0x0001: 'ascii',
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0x0002: 'bigint',
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0x0003: 'blob',
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0x0004: 'boolean',
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0x0005: 'counter',
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0x0006: 'decimal',
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0x0007: 'double',
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0x0008: 'float',
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0x0009: 'int',
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0x000A: 'text',
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0x000B: 'timestamp',
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0x000C: 'uuid',
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0x000D: 'varchar',
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0x000E: 'varint',
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0x000F: 'timeuuid',
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0x0010: 'inet',
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0x0020: 'list',
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0x0021: 'map',
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0x0022: 'set',
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}
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FLAGS_GLOBAL_TABLES_SPEC = 0x0001
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@classmethod
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def recv_body(cls, f):
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kind = read_int(f)
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if kind == cls.KIND_VOID:
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results = None
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elif kind == cls.KIND_ROWS:
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results = cls.recv_results_rows(f)
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elif kind == cls.KIND_SET_KEYSPACE:
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ksname = read_string(f)
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results = ksname
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elif kind == cls.KIND_PREPARED:
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results = cls.recv_results_prepared(f)
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elif kind == cls.KIND_SCHEMA_CHANGE:
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results = cls.recv_results_schema_change(f)
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return cls(kind=kind, results=results)
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@classmethod
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def recv_results_rows(cls, f):
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colspecs = cls.recv_results_metadata(f)
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rowcount = read_int(f)
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rows = [cls.recv_row(f, len(colspecs)) for x in xrange(rowcount)]
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colnames = [c[2] for c in colspecs]
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coltypes = [c[3] for c in colspecs]
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return (colnames, [tuple(ctype.from_binary(val) for ctype, val in zip(coltypes, row))
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for row in rows])
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@classmethod
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def recv_results_prepared(cls, f):
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queryid = read_int(f)
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colspecs = cls.recv_results_metadata(f)
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return (queryid, colspecs)
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@classmethod
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def recv_results_metadata(cls, f):
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flags = read_int(f)
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glob_tblspec = bool(flags & cls.FLAGS_GLOBAL_TABLES_SPEC)
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colcount = read_int(f)
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if glob_tblspec:
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ksname = read_string(f)
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cfname = read_string(f)
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colspecs = []
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for x in xrange(colcount):
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if glob_tblspec:
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colksname = ksname
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colcfname = cfname
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else:
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colksname = read_string(f)
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colcfname = read_string(f)
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colname = read_string(f)
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coltype = cls.read_type(f)
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colspecs.append((colksname, colcfname, colname, coltype))
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return colspecs
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@classmethod
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def recv_results_schema_change(cls, f):
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change_type = read_string(f)
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keyspace = read_string(f)
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table = read_string(f)
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return dict(change_type=change_type, keyspace=keyspace, table=table)
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@classmethod
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def read_type(cls, f):
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optid = read_short(f)
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try:
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cqltype = lookup_cqltype(cls.type_codes[optid])
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except KeyError:
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raise NotSupportedError("Unknown data type code 0x%x. Have to skip"
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" entire result set." % optid)
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if cqltype.typename in ('list', 'set'):
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subtype = cls.read_type(f)
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cqltype = cqltype.apply_parameters(subtype)
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elif cqltype.typename == 'map':
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keysubtype = cls.read_type(f)
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valsubtype = cls.read_type(f)
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cqltype = cqltype.apply_parameters(keysubtype, valsubtype)
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return cqltype
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@staticmethod
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def recv_row(f, colcount):
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return [read_value(f) for x in xrange(colcount)]
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class PrepareMessage(_MessageType):
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opcode = 0x09
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name = 'PREPARE'
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params = ('query',)
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def send_body(self, f):
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write_longstring(f, self.query)
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class ExecuteMessage(_MessageType):
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opcode = 0x0A
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name = 'EXECUTE'
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params = ('queryid', 'query_params', 'consistency_level',)
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def send_body(self, f):
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write_int(f, self.queryid)
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write_short(f, len(self.query_params))
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for param in self.query_params:
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write_value(f, param)
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write_consistency_level(f, self.consistency_level)
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known_event_types = frozenset((
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'TOPOLOGY_CHANGE',
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'STATUS_CHANGE',
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'SCHEMA_CHANGE'
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))
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class RegisterMessage(_MessageType):
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opcode = 0x0B
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name = 'REGISTER'
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params = ('event_list',)
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def send_body(self, f):
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write_stringlist(f, self.event_list)
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class EventMessage(_MessageType):
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opcode = 0x0C
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name = 'EVENT'
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params = ('event_type', 'event_args')
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@classmethod
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def recv_body(cls, f):
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event_type = read_string(f).upper()
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if event_type in known_event_types:
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read_method = getattr(cls, 'recv_' + event_type.lower())
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return cls(event_type=event_type, event_args=read_method(f))
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raise NotSupportedError('Unknown event type %r' % event_type)
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@classmethod
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def recv_topology_change(cls, f):
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# "NEW_NODE" or "REMOVED_NODE"
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change_type = read_string(f)
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address = read_inet(f)
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return dict(change_type=change_type, address=address)
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@classmethod
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def recv_status_change(cls, f):
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# "UP" or "DOWN"
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change_type = read_string(f)
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address = read_inet(f)
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return dict(change_type=change_type, address=address)
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@classmethod
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def recv_schema_change(cls, f):
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# "CREATED", "DROPPED", or "UPDATED"
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change_type = read_string(f)
|
|
keyspace = read_string(f)
|
|
table = read_string(f)
|
|
return dict(change_type=change_type, keyspace=keyspace, table=table)
|
|
|
|
|
|
def read_byte(f):
|
|
return int8_unpack(f.read(1))
|
|
|
|
def write_byte(f, b):
|
|
f.write(int8_pack(b))
|
|
|
|
def read_int(f):
|
|
return int32_unpack(f.read(4))
|
|
|
|
def write_int(f, i):
|
|
f.write(int32_pack(i))
|
|
|
|
def read_short(f):
|
|
return uint16_unpack(f.read(2))
|
|
|
|
def write_short(f, s):
|
|
f.write(uint16_pack(s))
|
|
|
|
def read_consistency_level(f):
|
|
return ConsistencyLevel.value_to_name[read_short(f)]
|
|
|
|
def write_consistency_level(f, cl):
|
|
write_short(f, cl)
|
|
|
|
def read_string(f):
|
|
size = read_short(f)
|
|
contents = f.read(size)
|
|
return contents.decode('utf8')
|
|
|
|
def write_string(f, s):
|
|
if isinstance(s, unicode):
|
|
s = s.encode('utf8')
|
|
write_short(f, len(s))
|
|
f.write(s)
|
|
|
|
def read_longstring(f):
|
|
size = read_int(f)
|
|
contents = f.read(size)
|
|
return contents.decode('utf8')
|
|
|
|
def write_longstring(f, s):
|
|
if isinstance(s, unicode):
|
|
s = s.encode('utf8')
|
|
write_int(f, len(s))
|
|
f.write(s)
|
|
|
|
def read_stringlist(f):
|
|
numstrs = read_short(f)
|
|
return [read_string(f) for x in xrange(numstrs)]
|
|
|
|
def write_stringlist(f, stringlist):
|
|
write_short(f, len(stringlist))
|
|
for s in stringlist:
|
|
write_string(f, s)
|
|
|
|
def read_stringmap(f):
|
|
numpairs = read_short(f)
|
|
strmap = {}
|
|
for x in xrange(numpairs):
|
|
k = read_string(f)
|
|
strmap[k] = read_string(f)
|
|
return strmap
|
|
|
|
def write_stringmap(f, strmap):
|
|
write_short(f, len(strmap))
|
|
for k, v in strmap.items():
|
|
write_string(f, k)
|
|
write_string(f, v)
|
|
|
|
def read_stringmultimap(f):
|
|
numkeys = read_short(f)
|
|
strmmap = {}
|
|
for x in xrange(numkeys):
|
|
k = read_string(f)
|
|
strmmap[k] = read_stringlist(f)
|
|
return strmmap
|
|
|
|
def write_stringmultimap(f, strmmap):
|
|
write_short(f, len(strmmap))
|
|
for k, v in strmmap.items():
|
|
write_string(f, k)
|
|
write_stringlist(f, v)
|
|
|
|
def read_value(f):
|
|
size = read_int(f)
|
|
if size < 0:
|
|
return None
|
|
return f.read(size)
|
|
|
|
def write_value(f, v):
|
|
if v is None:
|
|
write_int(f, -1)
|
|
else:
|
|
write_int(f, len(v))
|
|
f.write(v)
|
|
|
|
def read_inet(f):
|
|
size = read_byte(f)
|
|
addrbytes = f.read(size)
|
|
port = read_int(f)
|
|
if size == 4:
|
|
addrfam = socket.AF_INET
|
|
elif size == 16:
|
|
addrfam = socket.AF_INET6
|
|
else:
|
|
raise InternalError("bad inet address: %r" % (addrbytes,))
|
|
return (socket.inet_ntop(addrfam, addrbytes), port)
|
|
|
|
def write_inet(f, addrtuple):
|
|
addr, port = addrtuple
|
|
if ':' in addr:
|
|
addrfam = socket.AF_INET6
|
|
else:
|
|
addrfam = socket.AF_INET
|
|
addrbytes = socket.inet_pton(addrfam, addr)
|
|
write_byte(f, len(addrbytes))
|
|
f.write(addrbytes)
|
|
write_int(f, port)
|
|
|
|
|
|
def cql_quote(term):
|
|
if isinstance(term, unicode):
|
|
return "'%s'" % term.encode('utf8').replace("'", "''")
|
|
elif isinstance(term, (str, bool)):
|
|
return "'%s'" % str(term).replace("'", "''")
|
|
else:
|
|
return str(term)
|
|
|
|
|
|
def cql_encode_none(val):
|
|
return 'NULL'
|
|
|
|
|
|
def cql_encode_unicode(val):
|
|
return cql_quote(val.encode('utf-8'))
|
|
|
|
|
|
def cql_encode_str(val):
|
|
return cql_quote(val)
|
|
|
|
|
|
def cql_encode_object(val):
|
|
return str(val)
|
|
|
|
def cql_encode_datetime(val):
|
|
return "'%s'" % val.strftime('%Y-%m-%d %H:%M:%S-0000')
|
|
|
|
def cql_encode_date(val):
|
|
return "'%s'" % val.strftime('%Y-%m-%d-0000')
|
|
|
|
def cql_encode_sequence(val):
|
|
return '( %s )' % ' , '.join(cql_encoders.get(type(v), cql_encode_object)(v)
|
|
for v in val)
|
|
|
|
def cql_encode_map_collection(val):
|
|
return '{ %s }' % ' , '.join('%s : %s' % (cql_quote(k), cql_quote(v))
|
|
for k, v in val.iteritems())
|
|
|
|
def cql_encode_list_collection(val):
|
|
return '[ %s ]' % ' , '.join(map(cql_quote, val))
|
|
|
|
|
|
def cql_encode_set_collection(val):
|
|
return '{ %s }' % ' , '.join(map(cql_quote, val))
|
|
|
|
cql_encoders = {
|
|
float: cql_encode_object,
|
|
str: cql_encode_str,
|
|
types.NoneType: cql_encode_none,
|
|
int: cql_encode_object,
|
|
long: cql_encode_object,
|
|
UUID: cql_encode_object,
|
|
datetime.datetime: cql_encode_datetime,
|
|
datetime.date: cql_encode_date,
|
|
dict: cql_encode_map_collection,
|
|
list: cql_encode_sequence,
|
|
tuple: cql_encode_sequence,
|
|
set: cql_encode_sequence,
|
|
types.GeneratorType: cql_encode_sequence
|
|
}
|