def unpack(cls, data):
amqp, data = eat(data, 4)
if amqp != "AMQP":
raise ValueError('Invalid data: Data did not begin with "AMQP"')
proto_id, data = eat(data, 1)
proto_version, data = eat(data, 3)
return cls(proto_id, proto_version), data
def unpack(cls, data):
header, data = FrameHeader.unpack(data)
payload, data = eat(data, header.size)
frame_end, data = eat(data, 1)
if frame_end != cls.FRAME_END:
raise ValueError("Framing error: Frame ended with {!r}, not {!r}".format(frame_end, cls.FRAME_END))
payload_type = cls.payload_types[header.type]
try:
payload, leftover = payload_type.unpack(payload)
except Incomplete:
_, _, tb = sys.exc_info()
ex = ValueError("Frame payload reported Incomplete")
raise type(ex), ex, tb
if leftover:
raise ValueError("Payload had excess bytes: {!r}".format(leftover))
return cls(header.type, header.channel, payload), data
def pack(self):
first, rest = eat(self.value, 1)
if first not in self.FIRSTCHARS:
raise ValueError("Illegal character {} as first character of field name".format(first))
for c in rest:
if c not in self.CHARS:
raise ValueError("Illegal character {} in field name".format(c))
return super(FieldName, self).pack()
def unpack(cls, data):
payload, data = LongString.unpack(data)
payload = payload.value
values = []
try:
while payload:
type_specifier, payload = eat(payload, 1)
field_type = FIELD_TYPES[type_specifier]
value, payload = field_type.unpack(payload)
values.append(value)
except Incomplete:
_, _, tb = sys.exc_info()
ex = ValueError("FieldArray payload reported Incomplete")
raise type(ex), ex, tb
return cls(values), data
def unpack(cls, data):
payload, data = LongString.unpack(data)
payload = payload.value
values = {}
try:
while payload:
name, payload = FieldName.unpack(payload)
name = name.value
type_specifier, payload = eat(payload, 1)
field_type = FIELD_TYPES[type_specifier]
value, payload = field_type.unpack(payload)
values[name] = value
except Incomplete:
_, _, tb = sys.exc_info()
ex = ValueError("FieldTable payload reported Incomplete")
raise type(ex), ex, tb
return cls(values), data
def unpack(cls, data): length, data = cls.len_type.unpack(data) string, data = eat(data, length.value) return cls(string), data
def unpack(cls, data): data, leftover = eat(data, cls.len()) value, = struct.unpack(cls.struct_fmt(), data) return cls(value), leftover
def decode(cls, data):
"""Decode message from data and return (message_type, payload, remaining data),
or raise Incomplete if more data is needed to complete a message."""
(length, message_type), data = unpack('IB', data)
payload, data = eat(data, length)
return message_type, payload, data
