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983 lines (831 loc) · 21.2 KB
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##
# .protocol.element3
##
"""
PQ version 3.0 elements.
"""
import sys
import os
import pprint
from struct import unpack, Struct
from .message_types import message_types
from ..python.structlib import ushort_pack, ushort_unpack, ulong_pack, ulong_unpack
try:
from ..port.optimized import parse_tuple_message, pack_tuple_data
except ImportError:
def pack_tuple_data(atts,
none = None,
ulong_pack = ulong_pack,
blen = bytes.__len__
):
return b''.join([
b'\xff\xff\xff\xff'
if x is none
else (ulong_pack(blen(x)) + x)
for x in atts
])
try:
from ..port.optimized import cat_messages
except ImportError:
from ..python.structlib import lH_pack, long_pack
# Special case tuple()'s
def _pack_tuple(t,
blen = bytes.__len__,
tlen = tuple.__len__,
pack_head = lH_pack,
ulong_pack = ulong_pack,
ptd = pack_tuple_data,
):
# NOTE: duplicated from above
r = b''.join([
b'\xff\xff\xff\xff'
if x is None
else (ulong_pack(blen(x)) + x)
for x in t
])
return pack_head((blen(r) + 6, tlen(t))) + r
def cat_messages(messages,
lpack = long_pack,
blen = bytes.__len__,
tuple = tuple,
pack_tuple = _pack_tuple
):
return b''.join([
(x.bytes() if x.__class__ is not bytes else (
b'd' + lpack(blen(x) + 4) + x
)) if x.__class__ is not tuple else (
b'D' + pack_tuple(x)
) for x in messages
])
del _pack_tuple, lH_pack, long_pack
StringFormat = b'\x00\x00'
BinaryFormat = b'\x00\x01'
class Message(object):
bytes_struct = Struct("!cL")
__slots__ = ()
def __repr__(self):
return '%s.%s(%s)' %(
type(self).__module__,
type(self).__name__,
', '.join([repr(getattr(self, x)) for x in self.__slots__])
)
def __eq__(self, ob):
return isinstance(ob, type(self)) and self.type == ob.type and \
not False in (
getattr(self, x) == getattr(ob, x)
for x in self.__slots__
)
def bytes(self):
data = self.serialize()
return self.bytes_struct.pack(self.type, len(data) + 4) + data
@classmethod
def parse(typ, data):
return typ(data)
class StringMessage(Message):
"""
A message based on a single string component.
"""
type = b''
__slots__ = ('data',)
def __repr__(self):
return '%s.%s(%s)' %(
type(self).__module__,
type(self).__name__,
repr(self.data),
)
def __getitem__(self, i):
return self.data.__getitem__(i)
def __init__(self, data):
self.data = data
def serialize(self):
return bytes(self.data) + b'\x00'
@classmethod
def parse(typ, data):
if not data.endswith(b'\x00'):
raise ValueError("string message not NUL-terminated")
return typ(data[:-1])
class TupleMessage(tuple, Message):
"""
A message who's data is based on a tuple structure.
"""
type = b''
__slots__ = ()
def __repr__(self):
return '%s.%s(%s)' %(
type(self).__module__,
type(self).__name__,
tuple.__repr__(self)
)
class Void(Message):
"""
An absolutely empty message. When serialized, it always yields an empty string.
"""
type = b''
__slots__ = ()
def bytes(self):
return b''
def serialize(self):
return b''
def __new__(typ, *args, **kw):
return VoidMessage
VoidMessage = Message.__new__(Void)
def dict_message_repr(self):
return '%s.%s(**%s)' %(
type(self).__module__,
type(self).__name__,
pprint.pformat(dict(self))
)
class WireMessage(Message):
def __init__(self, typ_data):
self.type = message_types[typ_data[0][0]]
self.data = typ_data[1]
def serialize(self):
return self[1]
@classmethod
def parse(typ, data):
if ulong_unpack(data[1:5]) != len(data) - 1:
raise ValueError(
"invalid wire message where data is %d bytes and " \
"internal size stamp is %d bytes" %(
len(data), ulong_unpack(data[1:5]) + 1
)
)
return typ((data[0:1], data[5:]))
class EmptyMessage(Message):
"""
An abstract message that is always empty.
"""
__slots__ = ()
type = b''
def __new__(typ):
return typ.SingleInstance
def serialize(self):
return b''
@classmethod
def parse(typ, data):
if data != b'':
raise ValueError("empty message(%r) had data" %(typ.type,))
return typ.SingleInstance
class Notify(Message):
"""
Asynchronous notification message.
"""
type = message_types[b'A'[0]]
__slots__ = ('pid', 'channel', 'payload',)
def __init__(self, pid, channel, payload = b''):
self.pid = pid
self.channel = channel
self.payload = payload
def serialize(self):
return ulong_pack(self.pid) + \
self.channel + b'\x00' + \
self.payload + b'\x00'
@classmethod
def parse(typ, data):
pid = ulong_unpack(data)
channel, payload, _ = data[4:].split(b'\x00', 2)
return typ(pid, channel, payload)
class ShowOption(Message):
"""
GUC variable information from backend
"""
type = message_types[b'S'[0]]
__slots__ = ('name', 'value')
def __init__(self, name, value):
self.name = name
self.value = value
def serialize(self):
return self.name + b'\x00' + self.value + b'\x00'
@classmethod
def parse(typ, data):
return typ(*(data.split(b'\x00', 2)[0:2]))
class Complete(StringMessage):
"""
Command completion message.
"""
type = message_types[b'C'[0]]
__slots__ = ()
@classmethod
def parse(typ, data):
return typ(data.rstrip(b'\x00'))
def extract_count(self):
"""
Extract the last set of digits as an integer.
"""
# Find the last sequence of digits.
# If there are no fields consisting only of digits, there is no count.
for x in reversed(self.data.split()):
if x.isdigit():
return int(x)
return None
def extract_command(self):
"""
Strip all the *surrounding* digits and spaces from the command tag,
and return that string.
"""
return self.data.strip(b'\r\n\t 0123456789') or None
class Null(EmptyMessage):
"""
Null command.
"""
type = message_types[b'I'[0]]
__slots__ = ()
NullMessage = Message.__new__(Null)
Null.SingleInstance = NullMessage
class NoData(EmptyMessage):
"""
Null command.
"""
type = message_types[b'n'[0]]
__slots__ = ()
NoDataMessage = Message.__new__(NoData)
NoData.SingleInstance = NoDataMessage
class ParseComplete(EmptyMessage):
"""
Parse reaction.
"""
type = message_types[b'1'[0]]
__slots__ = ()
ParseCompleteMessage = Message.__new__(ParseComplete)
ParseComplete.SingleInstance = ParseCompleteMessage
class BindComplete(EmptyMessage):
"""
Bind reaction.
"""
type = message_types[b'2'[0]]
__slots__ = ()
BindCompleteMessage = Message.__new__(BindComplete)
BindComplete.SingleInstance = BindCompleteMessage
class CloseComplete(EmptyMessage):
"""
Close statement or Portal.
"""
type = message_types[b'3'[0]]
__slots__ = ()
CloseCompleteMessage = Message.__new__(CloseComplete)
CloseComplete.SingleInstance = CloseCompleteMessage
class Suspension(EmptyMessage):
"""
Portal was suspended, more tuples for reading.
"""
type = message_types[b's'[0]]
__slots__ = ()
SuspensionMessage = Message.__new__(Suspension)
Suspension.SingleInstance = SuspensionMessage
class Ready(Message):
"""
Ready for new query message.
"""
type = message_types[b'Z'[0]]
possible_states = (
message_types[b'I'[0]],
message_types[b'E'[0]],
message_types[b'T'[0]],
)
__slots__ = ('xact_state',)
def __init__(self, data):
if data not in self.possible_states:
raise ValueError("invalid state for Ready message: " + repr(data))
self.xact_state = data
def serialize(self):
return self.xact_state
class Notice(Message, dict):
"""
Notification message.
Used by PQ to emit INFO, NOTICE, and WARNING messages among other
severities.
"""
type = message_types[b'N'[0]]
__slots__ = ()
__repr__ = dict_message_repr
def serialize(self):
return b'\x00'.join([
k + v for k, v in self.items()
if k and v is not None
]) + b'\x00'
@classmethod
def parse(typ, data, msgtypes = message_types):
return typ([
(msgtypes[x[0]], x[1:])
# "if x" reduce empty fields
for x in data.split(b'\x00') if x
])
class ClientNotice(Notice):
__slots__ = ()
def serialize(self):
raise RuntimeError("cannot serialize ClientNotice")
@classmethod
def parse(self):
raise RuntimeError("cannot parse ClientNotice")
class Error(Notice):
"""
Error information message.
"""
type = message_types[b'E'[0]]
__slots__ = ()
class ClientError(Error):
__slots__ = ()
def serialize(self):
raise RuntimeError("cannot serialize ClientError")
@classmethod
def parse(self):
raise RuntimeError("cannot serialize ClientError")
class FunctionResult(Message):
"""
Function result value.
"""
type = message_types[b'V'[0]]
__slots__ = ('result',)
def __init__(self, datum):
self.result = datum
def serialize(self):
return self.result is None and b'\xff\xff\xff\xff' or \
ulong_pack(len(self.result)) + self.result
@classmethod
def parse(typ, data):
if data == b'\xff\xff\xff\xff':
return typ(None)
size = ulong_unpack(data[0:4])
data = data[4:]
if size != len(data):
raise ValueError(
"data length(%d) is not equal to the specified message size(%d)" %(
len(data), size
)
)
return typ(data)
class AttributeTypes(TupleMessage):
"""
Tuple attribute types.
"""
type = message_types[b't'[0]]
__slots__ = ()
def serialize(self):
return ushort_pack(len(self)) + b''.join([ulong_pack(x) for x in self])
@classmethod
def parse(typ, data):
ac = ushort_unpack(data[0:2])
args = data[2:]
if len(args) != ac * 4:
raise ValueError("invalid argument type data size")
return typ(unpack('!%dL'%(ac,), args))
class TupleDescriptor(TupleMessage):
"""
Tuple structure description.
"""
type = message_types[b'T'[0]]
struct = Struct("!LhLhlh")
__slots__ = ()
def keys(self):
return [x[0] for x in self]
def serialize(self):
return ushort_pack(len(self)) + b''.join([
x[0] + b'\x00' + self.struct.pack(*x[1:])
for x in self
])
@classmethod
def parse(typ, data):
ac = ushort_unpack(data[0:2])
atts = []
data = data[2:]
ca = 0
while ca < ac:
# End Of Attribute Name
eoan = data.index(b'\x00')
name = data[0:eoan]
data = data[eoan+1:]
# name, relationId, columnNumber, typeId, typlen, typmod, format
atts.append((name,) + typ.struct.unpack(data[0:18]))
data = data[18:]
ca += 1
return typ(atts)
class Tuple(TupleMessage):
"""
Tuple Data.
"""
type = message_types[b'D'[0]]
__slots__ = ()
def serialize(self):
return ushort_pack(len(self)) + pack_tuple_data(self)
@classmethod
def parse(typ, data,
T = tuple, ulong_unpack = ulong_unpack,
len = len
):
natts = ushort_unpack(data[0:2])
atts = []
offset = 2
add = atts.append
while natts > 0:
alo = offset
offset += 4
size = data[alo:offset]
if size == b'\xff\xff\xff\xff':
att = None
else:
al = ulong_unpack(size)
ao = offset
offset = ao + al
att = data[ao:offset]
add(att)
natts -= 1
return T(atts)
try:
parse = parse_tuple_message
except NameError:
# This is an override when port.optimized is available.
pass
class KillInformation(Message):
"""
Backend cancellation information.
"""
type = message_types[b'K'[0]]
struct = Struct("!LL")
__slots__ = ('pid', 'key')
def __init__(self, pid, key):
self.pid = pid
self.key = key
def serialize(self):
return self.struct.pack(self.pid, self.key)
@classmethod
def parse(typ, data):
return typ(*typ.struct.unpack(data))
class CancelRequest(KillInformation):
"""
Abort the query in the specified backend.
"""
type = b''
from .version import CancelRequestCode as version
packed_version = version.bytes()
__slots__ = ('pid', 'key')
def serialize(self):
return self.packed_version + self.struct.pack(
self.pid, self.key
)
def bytes(self):
data = self.serialize()
return ulong_pack(len(data) + 4) + self.serialize()
@classmethod
def parse(typ, data):
if data[0:4] != typ.packed_version:
raise ValueError("invalid cancel query code")
return typ(*typ.struct.unpack(data[4:]))
class NegotiateSSL(Message):
"""
Discover backend's SSL support.
"""
type = b''
from .version import NegotiateSSLCode as version
packed_version = version.bytes()
__slots__ = ()
def __new__(typ):
return NegotiateSSLMessage
def bytes(self):
data = self.serialize()
return ulong_pack(len(data) + 4) + data
def serialize(self):
return self.packed_version
@classmethod
def parse(typ, data):
if data != typ.packed_version:
raise ValueError("invalid SSL Negotiation code")
return NegotiateSSLMessage
NegotiateSSLMessage = Message.__new__(NegotiateSSL)
class Startup(Message, dict):
"""
Initiate a connection using the given keywords.
"""
type = b''
from postgresql.protocol.version import V3_0 as version
packed_version = version.bytes()
__slots__ = ()
__repr__ = dict_message_repr
def serialize(self):
return self.packed_version + b''.join([
k + b'\x00' + v + b'\x00'
for k, v in self.items()
if v is not None
]) + b'\x00'
def bytes(self):
data = self.serialize()
return ulong_pack(len(data) + 4) + data
@classmethod
def parse(typ, data):
if data[0:4] != typ.packed_version:
raise ValueError("invalid version code {1}".format(repr(data[0:4])))
kw = dict()
key = None
for value in data[4:].split(b'\x00')[:-2]:
if key is None:
key = value
continue
kw[key] = value
key = None
return typ(kw)
AuthRequest_OK = 0
AuthRequest_Cleartext = 3
AuthRequest_Password = AuthRequest_Cleartext
AuthRequest_Crypt = 4
AuthRequest_MD5 = 5
# Unsupported by pg_protocol.
AuthRequest_KRB4 = 1
AuthRequest_KRB5 = 2
AuthRequest_SCMC = 6
AuthRequest_SSPI = 9
AuthRequest_GSS = 7
AuthRequest_GSSContinue = 8
AuthNameMap = {
AuthRequest_Password : 'Cleartext',
AuthRequest_Crypt : 'Crypt',
AuthRequest_MD5 : 'MD5',
AuthRequest_KRB4 : 'Kerberos4',
AuthRequest_KRB5 : 'Kerberos5',
AuthRequest_SCMC : 'SCM Credential',
AuthRequest_SSPI : 'SSPI',
AuthRequest_GSS : 'GSS',
AuthRequest_GSSContinue : 'GSSContinue',
}
class Authentication(Message):
"""
Authentication(request, salt)
"""
type = message_types[b'R'[0]]
__slots__ = ('request', 'salt')
def __init__(self, request, salt):
self.request = request
self.salt = salt
def serialize(self):
return ulong_pack(self.request) + self.salt
@classmethod
def parse(typ, data):
return typ(ulong_unpack(data[0:4]), data[4:])
class Password(StringMessage):
"""
Password supplement.
"""
type = message_types[b'p'[0]]
__slots__ = ('data',)
class Disconnect(EmptyMessage):
"""
Connection closed message.
"""
type = message_types[b'X'[0]]
__slots__ = ()
DisconnectMessage = Message.__new__(Disconnect)
Disconnect.SingleInstance = DisconnectMessage
class Flush(EmptyMessage):
"""
Flush message.
"""
type = message_types[b'H'[0]]
__slots__ = ()
FlushMessage = Message.__new__(Flush)
Flush.SingleInstance = FlushMessage
class Synchronize(EmptyMessage):
"""
Synchronize.
"""
type = message_types[b'S'[0]]
__slots__ = ()
SynchronizeMessage = Message.__new__(Synchronize)
Synchronize.SingleInstance = SynchronizeMessage
class Query(StringMessage):
"""
Execute the query with the given arguments.
"""
type = message_types[b'Q'[0]]
__slots__ = ('data',)
class Parse(Message):
"""
Parse a query with the specified argument types.
"""
type = message_types[b'P'[0]]
__slots__ = ('name', 'statement', 'argtypes')
def __init__(self, name, statement, argtypes):
self.name = name
self.statement = statement
self.argtypes = argtypes
@classmethod
def parse(typ, data):
name, statement, args = data.split(b'\x00', 2)
ac = ushort_unpack(args[0:2])
args = args[2:]
if len(args) != ac * 4:
raise ValueError("invalid argument type data")
at = unpack('!%dL'%(ac,), args)
return typ(name, statement, at)
def serialize(self):
ac = ushort_pack(len(self.argtypes))
return self.name + b'\x00' + self.statement + b'\x00' + ac + b''.join([
ulong_pack(x) for x in self.argtypes
])
class Bind(Message):
"""
Bind a parsed statement with the given arguments to a Portal
Bind(
name, # Portal/Cursor identifier
statement, # Prepared Statement name/identifier
aformats, # Argument formats; Sequence of BinaryFormat or StringFormat.
arguments, # Argument data; Sequence of None or argument data(str).
rformats, # Result formats; Sequence of BinaryFormat or StringFormat.
)
"""
type = message_types[b'B'[0]]
__slots__ = ('name', 'statement', 'aformats', 'arguments', 'rformats')
def __init__(self, name, statement, aformats, arguments, rformats):
self.name = name
self.statement = statement
self.aformats = aformats
self.arguments = arguments
self.rformats = rformats
def serialize(self, len = len):
args = self.arguments
ac = ushort_pack(len(args))
ad = pack_tuple_data(tuple(args))
return \
self.name + b'\x00' + self.statement + b'\x00' + \
ac + b''.join(self.aformats) + ac + ad + \
ushort_pack(len(self.rformats)) + b''.join(self.rformats)
@classmethod
def parse(typ, message_data):
name, statement, data = message_data.split(b'\x00', 2)
ac = ushort_unpack(data[:2])
offset = 2 + (2 * ac)
aformats = unpack(("2s" * ac), data[2:offset])
natts = ushort_unpack(data[offset:offset+2])
args = list()
offset += 2
while natts > 0:
alo = offset
offset += 4
size = data[alo:offset]
if size == b'\xff\xff\xff\xff':
att = None
else:
al = ulong_unpack(size)
ao = offset
offset = ao + al
att = data[ao:offset]
args.append(att)
natts -= 1
rfc = ushort_unpack(data[offset:offset+2])
ao = offset + 2
offset = ao + (2 * rfc)
rformats = unpack(("2s" * rfc), data[ao:offset])
return typ(name, statement, aformats, args, rformats)
class Execute(Message):
"""
Fetch results from the specified Portal.
"""
type = message_types[b'E'[0]]
__slots__ = ('name', 'max')
def __init__(self, name, max = 0):
self.name = name
self.max = max
def serialize(self):
return self.name + b'\x00' + ulong_pack(self.max)
@classmethod
def parse(typ, data):
name, max = data.split(b'\x00', 1)
return typ(name, ulong_unpack(max))
class Describe(StringMessage):
"""
Request a description of a Portal or Prepared Statement.
"""
type = message_types[b'D'[0]]
__slots__ = ('data',)
def serialize(self):
return self.subtype + self.data + b'\x00'
@classmethod
def parse(typ, data):
if data[0:1] != typ.subtype:
raise ValueError(
"invalid Describe message subtype, %r; expected %r" %(
typ.subtype, data[0:1]
)
)
return super().parse(data[1:])
class DescribeStatement(Describe):
subtype = message_types[b'S'[0]]
__slots__ = ('data',)
class DescribePortal(Describe):
subtype = message_types[b'P'[0]]
__slots__ = ('data',)
class Close(StringMessage):
"""
Generic Close
"""
type = message_types[b'C'[0]]
__slots__ = ()
def serialize(self):
return self.subtype + self.data + b'\x00'
@classmethod
def parse(typ, data):
if data[0:1] != typ.subtype:
raise ValueError(
"invalid Close message subtype, %r; expected %r" %(
typ.subtype, data[0:1]
)
)
return super().parse(data[1:])
class CloseStatement(Close):
"""
Close the specified Statement
"""
subtype = message_types[b'S'[0]]
__slots__ = ()
class ClosePortal(Close):
"""
Close the specified Portal
"""
subtype = message_types[b'P'[0]]
__slots__ = ()
class Function(Message):
"""
Execute the specified function with the given arguments
"""
type = message_types[b'F'[0]]
__slots__ = ('oid', 'aformats', 'arguments', 'rformat')
def __init__(self, oid, aformats, args, rformat):
self.oid = oid
self.aformats = aformats
self.arguments = args
self.rformat = rformat
def serialize(self):
ac = ushort_pack(len(self.arguments))
return ulong_pack(self.oid) + \
ac + b''.join(self.aformats) + \
ac + pack_tuple_data(tuple(self.arguments)) + self.rformat
@classmethod
def parse(typ, data):
oid = ulong_unpack(data[0:4])
ac = ushort_unpack(data[4:6])
offset = 6 + (2 * ac)
aformats = unpack(("2s" * ac), data[6:offset])
natts = ushort_unpack(data[offset:offset+2])
args = list()
offset += 2
while natts > 0:
alo = offset
offset += 4
size = data[alo:offset]
if size == b'\xff\xff\xff\xff':
att = None
else:
al = ulong_unpack(size)
ao = offset
offset = ao + al
att = data[ao:offset]
args.append(att)
natts -= 1
return typ(oid, aformats, args, data[offset:])
class CopyBegin(Message):
type = None
struct = Struct("!BH")
__slots__ = ('format', 'formats')
def __init__(self, format, formats):
self.format = format
self.formats = formats
def serialize(self):
return self.struct.pack(self.format, len(self.formats)) + b''.join([
ushort_pack(x) for x in self.formats
])
@classmethod
def parse(typ, data):
format, natts = typ.struct.unpack(data[:3])
formats_str = data[3:]
if len(formats_str) != natts * 2:
raise ValueError("number of formats and data do not match up")
return typ(format, [
ushort_unpack(formats_str[x:x+2]) for x in range(0, natts * 2, 2)
])
class CopyToBegin(CopyBegin):
"""
Begin copying to.
"""
type = message_types[b'H'[0]]
__slots__ = ('format', 'formats')
class CopyFromBegin(CopyBegin):
"""
Begin copying from.
"""
type = message_types[b'G'[0]]
__slots__ = ('format', 'formats')
class CopyData(Message):
type = message_types[b'd'[0]]
__slots__ = ('data',)
def __init__(self, data):
self.data = bytes(data)
def serialize(self):
return self.data
@classmethod
def parse(typ, data):
return typ(data)
class CopyFail(StringMessage):
type = message_types[b'f'[0]]
__slots__ = ('data',)
class CopyDone(EmptyMessage):
type = message_types[b'c'[0]]
__slots__ = ('data',)
CopyDoneMessage = Message.__new__(CopyDone)
CopyDone.SingleInstance = CopyDoneMessage