782 lines
20 KiB
Python
782 lines
20 KiB
Python
import logging
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import socket
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from uuid import UUID
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from six.moves import cStringIO as StringIO
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from six.moves import xrange
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from cassandra import (Unavailable, WriteTimeout, ReadTimeout,
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AlreadyExists, InvalidRequest, Unauthorized)
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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 (AsciiType, BytesType, BooleanType,
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CounterColumnType, DateType, DecimalType,
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DoubleType, FloatType, Int32Type,
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InetAddressType, IntegerType, ListType,
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LongType, MapType, SetType, TimeUUIDType,
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UTF8Type, UUIDType, lookup_casstype)
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import six
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log = logging.getLogger(__name__)
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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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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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_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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tracing = False
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def to_string(self, stream_id, protocol_version, compression=None):
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body = StringIO()
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self.send_body(body, protocol_version)
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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 |= 0x01
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if self.tracing:
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flags |= 0x02
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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 __str__(self):
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paramstrs = ['%s=%r' % (pname, getattr(self, pname)) for pname in _get_params(self)]
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return '<%s(%s)>' % (self.__class__.__name__, ', '.join(paramstrs))
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__repr__ = __str__
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def _get_params(message_obj):
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base_attrs = dir(_MessageType)
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return [a for a in dir(message_obj)
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if a not in base_attrs and not a.startswith('_') and not callable(getattr(message_obj, a))]
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def decode_response(stream_id, flags, opcode, body, decompressor=None):
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if flags & 0x01:
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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 ^= 0x01
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body = StringIO(body)
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if flags & 0x02:
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trace_id = UUID(bytes=body.read(16))
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flags ^= 0x02
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else:
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trace_id = None
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if flags:
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log.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(body)
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msg.stream_id = stream_id
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msg.trace_id = trace_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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summary = 'Unknown'
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def __init__(self, code, message, info):
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self.code = code
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self.message = message
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self.info = info
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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=' + repr(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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def to_exception(self):
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return self
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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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def to_exception(self):
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return Unavailable(self.summary_msg(), **self.info)
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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 WriteTimeoutErrorMessage(RequestExecutionException):
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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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def to_exception(self):
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return WriteTimeout(self.summary_msg(), **self.info)
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class ReadTimeoutErrorMessage(RequestExecutionException):
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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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def to_exception(self):
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return ReadTimeout(self.summary_msg(), **self.info)
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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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def to_exception(self):
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return Unauthorized(self.summary_msg())
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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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def to_exception(self):
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return InvalidRequest(self.summary_msg())
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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 PreparedQueryNotFound(RequestValidationException):
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summary = 'Matching prepared statement not found on this node'
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error_code = 0x2500
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@staticmethod
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def recv_error_info(f):
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# return the query ID
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return read_binary_string(f)
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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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def to_exception(self):
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return AlreadyExists(**self.info)
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class StartupMessage(_MessageType):
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opcode = 0x01
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name = 'STARTUP'
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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 __init__(self, cqlversion, options):
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self.cqlversion = cqlversion
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self.options = options
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def send_body(self, f, protocol_version):
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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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@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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def __init__(self, authenticator):
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self.authenticator = 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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def __init__(self, creds):
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self.creds = creds
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def send_body(self, f, protocol_version):
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write_short(f, len(self.creds))
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for credkey, credval in self.creds.items():
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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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def send_body(self, f, protocol_version):
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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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def __init__(self, cql_versions, options):
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self.cql_versions = cql_versions
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self.options = 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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# used for QueryMessage and ExecuteMessage
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_VALUES_FLAG = 0x01
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_SKIP_METADATA_FLAG = 0x01
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_PAGE_SIZE_FLAG = 0x04
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_WITH_PAGING_STATE_SIZE_FLAG = 0x08
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_WITH_SERIAL_CONSISTENCY_FLAG = 0x10
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class QueryMessage(_MessageType):
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opcode = 0x07
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name = 'QUERY'
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def __init__(self, query, consistency_level):
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self.query = query
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self.consistency_level = consistency_level
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def send_body(self, f, protocol_version):
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write_longstring(f, self.query)
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write_consistency_level(f, self.consistency_level)
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flags = 0x00
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write_byte(f, flags)
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CUSTOM_TYPE = object()
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RESULT_KIND_VOID = 0x0001
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RESULT_KIND_ROWS = 0x0002
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RESULT_KIND_SET_KEYSPACE = 0x0003
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RESULT_KIND_PREPARED = 0x0004
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RESULT_KIND_SCHEMA_CHANGE = 0x0005
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class ResultMessage(_MessageType):
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opcode = 0x08
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name = 'RESULT'
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_type_codes = {
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0x0000: CUSTOM_TYPE,
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0x0001: AsciiType,
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0x0002: LongType,
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0x0003: BytesType,
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0x0004: BooleanType,
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0x0005: CounterColumnType,
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0x0006: DecimalType,
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0x0007: DoubleType,
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0x0008: FloatType,
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0x0009: Int32Type,
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0x000A: UTF8Type,
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0x000B: DateType,
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0x000C: UUIDType,
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0x000D: UTF8Type,
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0x000E: IntegerType,
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0x000F: TimeUUIDType,
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0x0010: InetAddressType,
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0x0020: ListType,
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0x0021: MapType,
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0x0022: SetType,
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}
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_FLAGS_GLOBAL_TABLES_SPEC = 0x0001
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def __init__(self, kind, results):
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self.kind = kind
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self.results = results
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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 == RESULT_KIND_VOID:
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results = None
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elif kind == RESULT_KIND_ROWS:
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results = cls.recv_results_rows(f)
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elif kind == RESULT_KIND_SET_KEYSPACE:
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ksname = read_string(f)
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results = ksname
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elif kind == RESULT_KIND_PREPARED:
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results = cls.recv_results_prepared(f)
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elif kind == RESULT_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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column_metadata = cls.recv_results_metadata(f)
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rowcount = read_int(f)
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rows = [cls.recv_row(f, len(column_metadata)) for x in xrange(rowcount)]
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colnames = [c[2] for c in column_metadata]
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coltypes = [c[3] for c in column_metadata]
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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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query_id = read_binary_string(f)
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column_metadata = cls.recv_results_metadata(f)
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return (query_id, column_metadata)
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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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column_metadata = []
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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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column_metadata.append((colksname, colcfname, colname, coltype))
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return column_metadata
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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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typeclass = cls._type_codes[optid]
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except KeyError:
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raise NotSupportedError("Unknown data type code 0x%04x. Have to skip"
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" entire result set." % (optid,))
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if typeclass in (ListType, SetType):
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subtype = cls.read_type(f)
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typeclass = typeclass.apply_parameters((subtype,))
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elif typeclass == MapType:
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keysubtype = cls.read_type(f)
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valsubtype = cls.read_type(f)
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typeclass = typeclass.apply_parameters((keysubtype, valsubtype))
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elif typeclass == CUSTOM_TYPE:
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classname = read_string(f)
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typeclass = lookup_casstype(classname)
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return typeclass
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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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def __init__(self, query):
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self.query = query
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def send_body(self, f, protocol_version):
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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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def __init__(self, query_id, query_params, consistency_level):
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self.query_id = query_id
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self.query_params = query_params
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self.consistency_level = consistency_level
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def send_body(self, f, protocol_version):
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write_string(f, self.query_id)
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if protocol_version == 1:
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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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else:
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write_consistency_level(f, self.consistency_level)
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flags = _VALUES_FLAG
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write_byte(f, flags)
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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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class BatchMessage(_MessageType):
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opcode = 0x0D
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name = 'BATCH'
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def __init__(self, batch_type, queries, consistency_level):
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self.batch_type = batch_type
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self.queries = queries
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self.consistency_level = consistency_level
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def send_body(self, f, protocol_version):
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write_byte(f, self.batch_type.value)
|
|
write_short(f, len(self.queries))
|
|
for string_or_query_id, params in self.queries:
|
|
if isinstance(string_or_query_id, six.string_types):
|
|
write_byte(f, 0)
|
|
write_longstring(f, string_or_query_id)
|
|
else:
|
|
write_byte(f, 1)
|
|
write_short(f, string_or_query_id)
|
|
write_short(f, len(params))
|
|
for param in params:
|
|
write_value(f, param)
|
|
|
|
write_consistency_level(f, self.consistency_level)
|
|
|
|
|
|
known_event_types = frozenset((
|
|
'TOPOLOGY_CHANGE',
|
|
'STATUS_CHANGE',
|
|
'SCHEMA_CHANGE'
|
|
))
|
|
|
|
|
|
class RegisterMessage(_MessageType):
|
|
opcode = 0x0B
|
|
name = 'REGISTER'
|
|
|
|
def __init__(self, event_list):
|
|
self.event_list = event_list
|
|
|
|
def send_body(self, f, protocol_version):
|
|
write_stringlist(f, self.event_list)
|
|
|
|
|
|
class EventMessage(_MessageType):
|
|
opcode = 0x0C
|
|
name = 'EVENT'
|
|
|
|
def __init__(self, event_type, event_args):
|
|
self.event_type = event_type
|
|
self.event_args = event_args
|
|
|
|
@classmethod
|
|
def recv_body(cls, f):
|
|
event_type = read_string(f).upper()
|
|
if event_type in known_event_types:
|
|
read_method = getattr(cls, 'recv_' + event_type.lower())
|
|
return cls(event_type=event_type, event_args=read_method(f))
|
|
raise NotSupportedError('Unknown event type %r' % event_type)
|
|
|
|
@classmethod
|
|
def recv_topology_change(cls, f):
|
|
# "NEW_NODE" or "REMOVED_NODE"
|
|
change_type = read_string(f)
|
|
address = read_inet(f)
|
|
return dict(change_type=change_type, address=address)
|
|
|
|
@classmethod
|
|
def recv_status_change(cls, f):
|
|
# "UP" or "DOWN"
|
|
change_type = read_string(f)
|
|
address = read_inet(f)
|
|
return dict(change_type=change_type, address=address)
|
|
|
|
@classmethod
|
|
def recv_schema_change(cls, f):
|
|
# "CREATED", "DROPPED", or "UPDATED"
|
|
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 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 read_binary_string(f):
|
|
size = read_short(f)
|
|
contents = f.read(size)
|
|
return contents
|
|
|
|
|
|
def write_string(f, s):
|
|
if isinstance(s, six.text_type):
|
|
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, six.text_type):
|
|
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)
|