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Copy pathprotocol.py
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1321 lines (1017 loc) · 40.3 KB
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# 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.
from __future__ import absolute_import # to enable import io from stdlib
from collections import namedtuple
import logging
import socket
from uuid import UUID
import six
from six.moves import range
import io
from cassandra import ProtocolVersion
from cassandra import type_codes, DriverException
from cassandra import (Unavailable, WriteTimeout, ReadTimeout,
WriteFailure, ReadFailure, FunctionFailure,
AlreadyExists, InvalidRequest, Unauthorized,
UnsupportedOperation, UserFunctionDescriptor,
UserAggregateDescriptor, SchemaTargetType)
from cassandra.marshal import (int32_pack, int32_unpack, uint16_pack, uint16_unpack,
int8_pack, int8_unpack, uint64_pack,
header_pack, uint32_pack)
from cassandra.cqltypes import (AsciiType, BytesType, BooleanType,
CounterColumnType, DateType, DecimalType,
DoubleType, FloatType, Int32Type,
InetAddressType, IntegerType, ListType,
LongType, MapType, SetType, TimeUUIDType,
UTF8Type, VarcharType, UUIDType, UserType,
TupleType, lookup_casstype, SimpleDateType,
TimeType, ByteType, ShortType, DurationType)
from cassandra.policies import WriteType
from cassandra.cython_deps import HAVE_CYTHON, HAVE_NUMPY
from cassandra import util
log = logging.getLogger(__name__)
class NotSupportedError(Exception):
pass
class InternalError(Exception):
pass
ColumnMetadata = namedtuple("ColumnMetadata", ['keyspace_name', 'table_name', 'name', 'type'])
HEADER_DIRECTION_TO_CLIENT = 0x80
HEADER_DIRECTION_MASK = 0x80
COMPRESSED_FLAG = 0x01
TRACING_FLAG = 0x02
CUSTOM_PAYLOAD_FLAG = 0x04
WARNING_FLAG = 0x08
USE_BETA_FLAG = 0x10
USE_BETA_MASK = ~USE_BETA_FLAG
_message_types_by_opcode = {}
_UNSET_VALUE = object()
def register_class(cls):
_message_types_by_opcode[cls.opcode] = cls
def get_registered_classes():
return _message_types_by_opcode.copy()
class _RegisterMessageType(type):
def __init__(cls, name, bases, dct):
if not name.startswith('_'):
register_class(cls)
@six.add_metaclass(_RegisterMessageType)
class _MessageType(object):
tracing = False
custom_payload = None
warnings = None
def update_custom_payload(self, other):
if other:
if not self.custom_payload:
self.custom_payload = {}
self.custom_payload.update(other)
if len(self.custom_payload) > 65535:
raise ValueError("Custom payload map exceeds max count allowed by protocol (65535)")
def __repr__(self):
return '<%s(%s)>' % (self.__class__.__name__, ', '.join('%s=%r' % i for i in _get_params(self)))
def _get_params(message_obj):
base_attrs = dir(_MessageType)
return (
(n, a) for n, a in message_obj.__dict__.items()
if n not in base_attrs and not n.startswith('_') and not callable(a)
)
error_classes = {}
class ErrorMessage(_MessageType, Exception):
opcode = 0x00
name = 'ERROR'
summary = 'Unknown'
def __init__(self, code, message, info):
self.code = code
self.message = message
self.info = info
@classmethod
def recv_body(cls, f, protocol_version, *args):
code = read_int(f)
msg = read_string(f)
subcls = error_classes.get(code, cls)
extra_info = subcls.recv_error_info(f, protocol_version)
return subcls(code=code, message=msg, info=extra_info)
def summary_msg(self):
msg = 'Error from server: code=%04x [%s] message="%s"' \
% (self.code, self.summary, self.message)
if six.PY2 and isinstance(msg, six.text_type):
msg = msg.encode('utf-8')
return msg
def __str__(self):
return '<%s>' % self.summary_msg()
__repr__ = __str__
@staticmethod
def recv_error_info(f, protocol_version):
pass
def to_exception(self):
return self
class ErrorMessageSubclass(_RegisterMessageType):
def __init__(cls, name, bases, dct):
if cls.error_code is not None: # Server has an error code of 0.
error_classes[cls.error_code] = cls
@six.add_metaclass(ErrorMessageSubclass)
class ErrorMessageSub(ErrorMessage):
error_code = None
class RequestExecutionException(ErrorMessageSub):
pass
class RequestValidationException(ErrorMessageSub):
pass
class ServerError(ErrorMessageSub):
summary = 'Server error'
error_code = 0x0000
class ProtocolException(ErrorMessageSub):
summary = 'Protocol error'
error_code = 0x000A
class BadCredentials(ErrorMessageSub):
summary = 'Bad credentials'
error_code = 0x0100
class UnavailableErrorMessage(RequestExecutionException):
summary = 'Unavailable exception'
error_code = 0x1000
@staticmethod
def recv_error_info(f, protocol_version):
return {
'consistency': read_consistency_level(f),
'required_replicas': read_int(f),
'alive_replicas': read_int(f),
}
def to_exception(self):
return Unavailable(self.summary_msg(), **self.info)
class OverloadedErrorMessage(RequestExecutionException):
summary = 'Coordinator node overloaded'
error_code = 0x1001
class IsBootstrappingErrorMessage(RequestExecutionException):
summary = 'Coordinator node is bootstrapping'
error_code = 0x1002
class TruncateError(RequestExecutionException):
summary = 'Error during truncate'
error_code = 0x1003
class WriteTimeoutErrorMessage(RequestExecutionException):
summary = "Coordinator node timed out waiting for replica nodes' responses"
error_code = 0x1100
@staticmethod
def recv_error_info(f, protocol_version):
return {
'consistency': read_consistency_level(f),
'received_responses': read_int(f),
'required_responses': read_int(f),
'write_type': WriteType.name_to_value[read_string(f)],
}
def to_exception(self):
return WriteTimeout(self.summary_msg(), **self.info)
class ReadTimeoutErrorMessage(RequestExecutionException):
summary = "Coordinator node timed out waiting for replica nodes' responses"
error_code = 0x1200
@staticmethod
def recv_error_info(f, protocol_version):
return {
'consistency': read_consistency_level(f),
'received_responses': read_int(f),
'required_responses': read_int(f),
'data_retrieved': bool(read_byte(f)),
}
def to_exception(self):
return ReadTimeout(self.summary_msg(), **self.info)
class ReadFailureMessage(RequestExecutionException):
summary = "Replica(s) failed to execute read"
error_code = 0x1300
@staticmethod
def recv_error_info(f, protocol_version):
consistency = read_consistency_level(f)
received_responses = read_int(f)
required_responses = read_int(f)
if ProtocolVersion.uses_error_code_map(protocol_version):
error_code_map = read_error_code_map(f)
failures = len(error_code_map)
else:
error_code_map = None
failures = read_int(f)
data_retrieved = bool(read_byte(f))
return {
'consistency': consistency,
'received_responses': received_responses,
'required_responses': required_responses,
'failures': failures,
'error_code_map': error_code_map,
'data_retrieved': data_retrieved
}
def to_exception(self):
return ReadFailure(self.summary_msg(), **self.info)
class FunctionFailureMessage(RequestExecutionException):
summary = "User Defined Function failure"
error_code = 0x1400
@staticmethod
def recv_error_info(f, protocol_version):
return {
'keyspace': read_string(f),
'function': read_string(f),
'arg_types': [read_string(f) for _ in range(read_short(f))],
}
def to_exception(self):
return FunctionFailure(self.summary_msg(), **self.info)
class WriteFailureMessage(RequestExecutionException):
summary = "Replica(s) failed to execute write"
error_code = 0x1500
@staticmethod
def recv_error_info(f, protocol_version):
consistency = read_consistency_level(f)
received_responses = read_int(f)
required_responses = read_int(f)
if ProtocolVersion.uses_error_code_map(protocol_version):
error_code_map = read_error_code_map(f)
failures = len(error_code_map)
else:
error_code_map = None
failures = read_int(f)
write_type = WriteType.name_to_value[read_string(f)]
return {
'consistency': consistency,
'received_responses': received_responses,
'required_responses': required_responses,
'failures': failures,
'error_code_map': error_code_map,
'write_type': write_type
}
def to_exception(self):
return WriteFailure(self.summary_msg(), **self.info)
class SyntaxException(RequestValidationException):
summary = 'Syntax error in CQL query'
error_code = 0x2000
class UnauthorizedErrorMessage(RequestValidationException):
summary = 'Unauthorized'
error_code = 0x2100
def to_exception(self):
return Unauthorized(self.summary_msg())
class InvalidRequestException(RequestValidationException):
summary = 'Invalid query'
error_code = 0x2200
def to_exception(self):
return InvalidRequest(self.summary_msg())
class ConfigurationException(RequestValidationException):
summary = 'Query invalid because of configuration issue'
error_code = 0x2300
class PreparedQueryNotFound(RequestValidationException):
summary = 'Matching prepared statement not found on this node'
error_code = 0x2500
@staticmethod
def recv_error_info(f, protocol_version):
# return the query ID
return read_binary_string(f)
class AlreadyExistsException(ConfigurationException):
summary = 'Item already exists'
error_code = 0x2400
@staticmethod
def recv_error_info(f, protocol_version):
return {
'keyspace': read_string(f),
'table': read_string(f),
}
def to_exception(self):
return AlreadyExists(**self.info)
class StartupMessage(_MessageType):
opcode = 0x01
name = 'STARTUP'
KNOWN_OPTION_KEYS = set((
'CQL_VERSION',
'COMPRESSION',
))
def __init__(self, cqlversion, options):
self.cqlversion = cqlversion
self.options = options
def send_body(self, f, protocol_version):
optmap = self.options.copy()
optmap['CQL_VERSION'] = self.cqlversion
write_stringmap(f, optmap)
class ReadyMessage(_MessageType):
opcode = 0x02
name = 'READY'
@classmethod
def recv_body(cls, *args):
return cls()
class AuthenticateMessage(_MessageType):
opcode = 0x03
name = 'AUTHENTICATE'
def __init__(self, authenticator):
self.authenticator = authenticator
@classmethod
def recv_body(cls, f, *args):
authname = read_string(f)
return cls(authenticator=authname)
class AuthChallengeMessage(_MessageType):
opcode = 0x0E
name = 'AUTH_CHALLENGE'
def __init__(self, challenge):
self.challenge = challenge
@classmethod
def recv_body(cls, f, *args):
return cls(read_binary_longstring(f))
class AuthResponseMessage(_MessageType):
opcode = 0x0F
name = 'AUTH_RESPONSE'
def __init__(self, response):
self.response = response
def send_body(self, f, protocol_version):
write_longstring(f, self.response)
class AuthSuccessMessage(_MessageType):
opcode = 0x10
name = 'AUTH_SUCCESS'
def __init__(self, token):
self.token = token
@classmethod
def recv_body(cls, f, *args):
return cls(read_longstring(f))
class OptionsMessage(_MessageType):
opcode = 0x05
name = 'OPTIONS'
def send_body(self, f, protocol_version):
pass
class SupportedMessage(_MessageType):
opcode = 0x06
name = 'SUPPORTED'
def __init__(self, cql_versions, options):
self.cql_versions = cql_versions
self.options = options
@classmethod
def recv_body(cls, f, *args):
options = read_stringmultimap(f)
cql_versions = options.pop('CQL_VERSION')
return cls(cql_versions=cql_versions, options=options)
# used for QueryMessage and ExecuteMessage
_VALUES_FLAG = 0x01
_SKIP_METADATA_FLAG = 0x02
_PAGE_SIZE_FLAG = 0x04
_WITH_PAGING_STATE_FLAG = 0x08
_WITH_SERIAL_CONSISTENCY_FLAG = 0x10
_PROTOCOL_TIMESTAMP = 0x20
_WITH_KEYSPACE_FLAG = 0x80
_PREPARED_WITH_KEYSPACE_FLAG = 0x01
class QueryMessage(_MessageType):
opcode = 0x07
name = 'QUERY'
def __init__(self, query, consistency_level, serial_consistency_level=None,
fetch_size=None, paging_state=None, timestamp=None, keyspace=None):
self.query = query
self.consistency_level = consistency_level
self.serial_consistency_level = serial_consistency_level
self.fetch_size = fetch_size
self.paging_state = paging_state
self.timestamp = timestamp
self.keyspace = keyspace
self._query_params = None # only used internally. May be set to a list of native-encoded values to have them sent with the request.
def send_body(self, f, protocol_version):
write_longstring(f, self.query)
write_consistency_level(f, self.consistency_level)
flags = 0x00
if self._query_params is not None:
flags |= _VALUES_FLAG # also v2+, but we're only setting params internally right now
if self.serial_consistency_level:
flags |= _WITH_SERIAL_CONSISTENCY_FLAG
if self.fetch_size:
flags |= _PAGE_SIZE_FLAG
if self.paging_state:
flags |= _WITH_PAGING_STATE_FLAG
if self.timestamp is not None:
flags |= _PROTOCOL_TIMESTAMP
if self.keyspace is not None:
if ProtocolVersion.uses_keyspace_flag(protocol_version):
flags |= _WITH_KEYSPACE_FLAG
else:
raise UnsupportedOperation(
"Keyspaces may only be set on queries with protocol version "
"5 or higher. Consider setting Cluster.protocol_version to 5.")
if ProtocolVersion.uses_int_query_flags(protocol_version):
write_uint(f, flags)
else:
write_byte(f, flags)
if self._query_params is not None:
write_short(f, len(self._query_params))
for param in self._query_params:
write_value(f, param)
if self.fetch_size:
write_int(f, self.fetch_size)
if self.paging_state:
write_longstring(f, self.paging_state)
if self.serial_consistency_level:
write_consistency_level(f, self.serial_consistency_level)
if self.timestamp is not None:
write_long(f, self.timestamp)
if self.keyspace is not None:
write_string(f, self.keyspace)
CUSTOM_TYPE = object()
RESULT_KIND_VOID = 0x0001
RESULT_KIND_ROWS = 0x0002
RESULT_KIND_SET_KEYSPACE = 0x0003
RESULT_KIND_PREPARED = 0x0004
RESULT_KIND_SCHEMA_CHANGE = 0x0005
class ResultMessage(_MessageType):
opcode = 0x08
name = 'RESULT'
kind = None
results = None
paging_state = None
# Names match type name in module scope. Most are imported from cassandra.cqltypes (except CUSTOM_TYPE)
type_codes = _cqltypes_by_code = dict((v, globals()[k]) for k, v in type_codes.__dict__.items() if not k.startswith('_'))
_FLAGS_GLOBAL_TABLES_SPEC = 0x0001
_HAS_MORE_PAGES_FLAG = 0x0002
_NO_METADATA_FLAG = 0x0004
def __init__(self, kind, results, paging_state=None, col_types=None):
self.kind = kind
self.results = results
self.paging_state = paging_state
self.col_types = col_types
@classmethod
def recv_body(cls, f, protocol_version, user_type_map, result_metadata):
kind = read_int(f)
paging_state = None
col_types = None
if kind == RESULT_KIND_VOID:
results = None
elif kind == RESULT_KIND_ROWS:
paging_state, col_types, results = cls.recv_results_rows(
f, protocol_version, user_type_map, result_metadata)
elif kind == RESULT_KIND_SET_KEYSPACE:
ksname = read_string(f)
results = ksname
elif kind == RESULT_KIND_PREPARED:
results = cls.recv_results_prepared(f, protocol_version, user_type_map)
elif kind == RESULT_KIND_SCHEMA_CHANGE:
results = cls.recv_results_schema_change(f, protocol_version)
else:
raise DriverException("Unknown RESULT kind: %d" % kind)
return cls(kind, results, paging_state, col_types)
@classmethod
def recv_results_rows(cls, f, protocol_version, user_type_map, result_metadata):
paging_state, column_metadata = cls.recv_results_metadata(f, user_type_map)
column_metadata = column_metadata or result_metadata
rowcount = read_int(f)
rows = [cls.recv_row(f, len(column_metadata)) for _ in range(rowcount)]
colnames = [c[2] for c in column_metadata]
coltypes = [c[3] for c in column_metadata]
try:
parsed_rows = [
tuple(ctype.from_binary(val, protocol_version)
for ctype, val in zip(coltypes, row))
for row in rows]
except Exception:
for row in rows:
for i in range(len(row)):
try:
coltypes[i].from_binary(row[i], protocol_version)
except Exception as e:
raise DriverException('Failed decoding result column "%s" of type %s: %s' % (colnames[i],
coltypes[i].cql_parameterized_type(),
str(e)))
return paging_state, coltypes, (colnames, parsed_rows)
@classmethod
def recv_results_prepared(cls, f, protocol_version, user_type_map):
query_id = read_binary_string(f)
bind_metadata, pk_indexes, result_metadata = cls.recv_prepared_metadata(f, protocol_version, user_type_map)
return query_id, bind_metadata, pk_indexes, result_metadata
@classmethod
def recv_results_metadata(cls, f, user_type_map):
flags = read_int(f)
colcount = read_int(f)
if flags & cls._HAS_MORE_PAGES_FLAG:
paging_state = read_binary_longstring(f)
else:
paging_state = None
no_meta = bool(flags & cls._NO_METADATA_FLAG)
if no_meta:
return paging_state, []
glob_tblspec = bool(flags & cls._FLAGS_GLOBAL_TABLES_SPEC)
if glob_tblspec:
ksname = read_string(f)
cfname = read_string(f)
column_metadata = []
for _ in range(colcount):
if glob_tblspec:
colksname = ksname
colcfname = cfname
else:
colksname = read_string(f)
colcfname = read_string(f)
colname = read_string(f)
coltype = cls.read_type(f, user_type_map)
column_metadata.append((colksname, colcfname, colname, coltype))
return paging_state, column_metadata
@classmethod
def recv_prepared_metadata(cls, f, protocol_version, user_type_map):
flags = read_int(f)
colcount = read_int(f)
pk_indexes = None
if protocol_version >= 4:
num_pk_indexes = read_int(f)
pk_indexes = [read_short(f) for _ in range(num_pk_indexes)]
glob_tblspec = bool(flags & cls._FLAGS_GLOBAL_TABLES_SPEC)
if glob_tblspec:
ksname = read_string(f)
cfname = read_string(f)
bind_metadata = []
for _ in range(colcount):
if glob_tblspec:
colksname = ksname
colcfname = cfname
else:
colksname = read_string(f)
colcfname = read_string(f)
colname = read_string(f)
coltype = cls.read_type(f, user_type_map)
bind_metadata.append(ColumnMetadata(colksname, colcfname, colname, coltype))
_, result_metadata = cls.recv_results_metadata(f, user_type_map)
return bind_metadata, pk_indexes, result_metadata
@classmethod
def recv_results_schema_change(cls, f, protocol_version):
return EventMessage.recv_schema_change(f, protocol_version)
@classmethod
def read_type(cls, f, user_type_map):
optid = read_short(f)
try:
typeclass = cls.type_codes[optid]
except KeyError:
raise NotSupportedError("Unknown data type code 0x%04x. Have to skip"
" entire result set." % (optid,))
if typeclass in (ListType, SetType):
subtype = cls.read_type(f, user_type_map)
typeclass = typeclass.apply_parameters((subtype,))
elif typeclass == MapType:
keysubtype = cls.read_type(f, user_type_map)
valsubtype = cls.read_type(f, user_type_map)
typeclass = typeclass.apply_parameters((keysubtype, valsubtype))
elif typeclass == TupleType:
num_items = read_short(f)
types = tuple(cls.read_type(f, user_type_map) for _ in range(num_items))
typeclass = typeclass.apply_parameters(types)
elif typeclass == UserType:
ks = read_string(f)
udt_name = read_string(f)
num_fields = read_short(f)
names, types = zip(*((read_string(f), cls.read_type(f, user_type_map))
for _ in range(num_fields)))
specialized_type = typeclass.make_udt_class(ks, udt_name, names, types)
specialized_type.mapped_class = user_type_map.get(ks, {}).get(udt_name)
typeclass = specialized_type
elif typeclass == CUSTOM_TYPE:
classname = read_string(f)
typeclass = lookup_casstype(classname)
return typeclass
@staticmethod
def recv_row(f, colcount):
return [read_value(f) for _ in range(colcount)]
class PrepareMessage(_MessageType):
opcode = 0x09
name = 'PREPARE'
def __init__(self, query, keyspace=None):
self.query = query
self.keyspace = keyspace
def send_body(self, f, protocol_version):
write_longstring(f, self.query)
flags = 0x00
if self.keyspace is not None:
if ProtocolVersion.uses_keyspace_flag(protocol_version):
flags |= _PREPARED_WITH_KEYSPACE_FLAG
else:
raise UnsupportedOperation(
"Keyspaces may only be set on queries with protocol version "
"5 or higher. Consider setting Cluster.protocol_version to 5.")
if ProtocolVersion.uses_prepare_flags(protocol_version):
write_uint(f, flags)
else:
# checks above should prevent this, but just to be safe...
if flags:
raise UnsupportedOperation(
"Attempted to set flags with value {flags:0=#8x} on"
"protocol version {pv}, which doesn't support flags"
"in prepared statements."
"Consider setting Cluster.protocol_version to 5."
"".format(flags=flags, pv=protocol_version))
if ProtocolVersion.uses_keyspace_flag(protocol_version):
if self.keyspace:
write_string(f, self.keyspace)
class ExecuteMessage(_MessageType):
opcode = 0x0A
name = 'EXECUTE'
def __init__(self, query_id, query_params, consistency_level,
serial_consistency_level=None, fetch_size=None,
paging_state=None, timestamp=None, skip_meta=False):
self.query_id = query_id
self.query_params = query_params
self.consistency_level = consistency_level
self.serial_consistency_level = serial_consistency_level
self.fetch_size = fetch_size
self.paging_state = paging_state
self.timestamp = timestamp
self.skip_meta = skip_meta
def send_body(self, f, protocol_version):
write_string(f, self.query_id)
write_consistency_level(f, self.consistency_level)
flags = _VALUES_FLAG
if self.serial_consistency_level:
flags |= _WITH_SERIAL_CONSISTENCY_FLAG
if self.fetch_size:
flags |= _PAGE_SIZE_FLAG
if self.paging_state:
flags |= _WITH_PAGING_STATE_FLAG
if self.timestamp is not None:
flags |= _PROTOCOL_TIMESTAMP
if self.skip_meta:
flags |= _SKIP_METADATA_FLAG
if ProtocolVersion.uses_int_query_flags(protocol_version):
write_uint(f, flags)
else:
write_byte(f, flags)
write_short(f, len(self.query_params))
for param in self.query_params:
write_value(f, param)
if self.fetch_size:
write_int(f, self.fetch_size)
if self.paging_state:
write_longstring(f, self.paging_state)
if self.serial_consistency_level:
write_consistency_level(f, self.serial_consistency_level)
if self.timestamp is not None:
write_long(f, self.timestamp)
class BatchMessage(_MessageType):
opcode = 0x0D
name = 'BATCH'
def __init__(self, batch_type, queries, consistency_level,
serial_consistency_level=None, timestamp=None,
keyspace=None):
self.batch_type = batch_type
self.queries = queries
self.consistency_level = consistency_level
self.serial_consistency_level = serial_consistency_level
self.timestamp = timestamp
self.keyspace = keyspace
def send_body(self, f, protocol_version):
write_byte(f, self.batch_type.value)
write_short(f, len(self.queries))
for prepared, string_or_query_id, params in self.queries:
if not prepared:
write_byte(f, 0)
write_longstring(f, string_or_query_id)
else:
write_byte(f, 1)
write_short(f, len(string_or_query_id))
f.write(string_or_query_id)
write_short(f, len(params))
for param in params:
write_value(f, param)
write_consistency_level(f, self.consistency_level)
flags = 0
if self.serial_consistency_level:
flags |= _WITH_SERIAL_CONSISTENCY_FLAG
if self.timestamp is not None:
flags |= _PROTOCOL_TIMESTAMP
if self.keyspace:
if ProtocolVersion.uses_keyspace_flag(protocol_version):
flags |= _WITH_KEYSPACE_FLAG
else:
raise UnsupportedOperation(
"Keyspaces may only be set on queries with protocol version "
"5 or higher. Consider setting Cluster.protocol_version to 5.")
if ProtocolVersion.uses_int_query_flags(protocol_version):
write_int(f, flags)
else:
write_byte(f, flags)
if self.serial_consistency_level:
write_consistency_level(f, self.serial_consistency_level)
if self.timestamp is not None:
write_long(f, self.timestamp)
if ProtocolVersion.uses_keyspace_flag(protocol_version):
if self.keyspace is not None:
write_string(f, self.keyspace)
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, protocol_version, *args):
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, protocol_version))
raise NotSupportedError('Unknown event type %r' % event_type)
@classmethod
def recv_topology_change(cls, f, protocol_version):
# "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, protocol_version):
# "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, protocol_version):
# "CREATED", "DROPPED", or "UPDATED"
change_type = read_string(f)
target = read_string(f)
keyspace = read_string(f)
event = {'target_type': target, 'change_type': change_type, 'keyspace': keyspace}
if target != SchemaTargetType.KEYSPACE:
target_name = read_string(f)
if target == SchemaTargetType.FUNCTION:
event['function'] = UserFunctionDescriptor(target_name, [read_string(f) for _ in range(read_short(f))])
elif target == SchemaTargetType.AGGREGATE:
event['aggregate'] = UserAggregateDescriptor(target_name, [read_string(f) for _ in range(read_short(f))])
else:
event[target.lower()] = target_name
return event
class _ProtocolHandler(object):
"""
_ProtocolHander handles encoding and decoding messages.
This class can be specialized to compose Handlers which implement alternative
result decoding or type deserialization. Class definitions are passed to :class:`cassandra.cluster.Cluster`
on initialization.
Contracted class methods are :meth:`_ProtocolHandler.encode_message` and :meth:`_ProtocolHandler.decode_message`.
"""
message_types_by_opcode = _message_types_by_opcode.copy()
"""
Default mapping of opcode to Message implementation. The default ``decode_message`` implementation uses
this to instantiate a message and populate using ``recv_body``. This mapping can be updated to inject specialized
result decoding implementations.
"""
@classmethod
def encode_message(cls, msg, stream_id, protocol_version, compressor, allow_beta_protocol_version):
"""
Encodes a message using the specified frame parameters, and compressor
:param msg: the message, typically of cassandra.protocol._MessageType, generated by the driver
:param stream_id: protocol stream id for the frame header
:param protocol_version: version for the frame header, and used encoding contents
:param compressor: optional compression function to be used on the body
"""
flags = 0
body = io.BytesIO()
if msg.custom_payload:
if protocol_version < 4:
raise UnsupportedOperation("Custom key/value payloads can only be used with protocol version 4 or higher")
flags |= CUSTOM_PAYLOAD_FLAG
write_bytesmap(body, msg.custom_payload)
msg.send_body(body, protocol_version)
body = body.getvalue()
if compressor and len(body) > 0:
body = compressor(body)
flags |= COMPRESSED_FLAG
if msg.tracing:
flags |= TRACING_FLAG
if allow_beta_protocol_version:
flags |= USE_BETA_FLAG
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