def stream_deserialize_value(self, f):
lut = {
FieldType.Type.u8: lambda: ser_read(f, 1),
FieldType.Type.u16: lambda: struct.unpack(b'<H', ser_read(f, 2))[0],
FieldType.Type.u32: lambda: struct.unpack(b'<I', ser_read(f, 4))[0],
FieldType.Type.u64: lambda: struct.unpack(b'<Q', ser_read(f, 8))[0],
FieldType.Type.i8: lambda: ser_read(f, 1),
FieldType.Type.i16: lambda: struct.unpack(b'<h', ser_read(f, 2))[0],
FieldType.Type.i32: lambda: struct.unpack(b'<i', ser_read(f, 4))[0],
FieldType.Type.i64: lambda: struct.unpack(b'<q', ser_read(f, 8))[0],
FieldType.Type.vi: lambda: VarIntSerializer.stream_deserialize(f),
FieldType.Type.fvi: lambda: FlagVarIntSerializer.stream_deserialize(f),
FieldType.Type.str: lambda: VarStringSerializer.stream_deserialize(f).decode('utf-8'),
FieldType.Type.bytes: lambda: BytesSerializer.stream_deserialize(f),
FieldType.Type.sha256: lambda: Hash256Id.stream_deserialize(f),
FieldType.Type.sha256d: lambda: Hash256Id.stream_deserialize(f),
FieldType.Type.ripmd160: lambda: Hash160Id.stream_deserialize(f),
FieldType.Type.hash160: lambda: Hash160Id.stream_deserialize(f),
FieldType.Type.pubkey: lambda: PubKey.stream_deserialize(f),
FieldType.Type.ecdsa: lambda: None,
}
if self.type in lut.keys():
return lut[self.type]()
else:
raise NotImplementedError()
def stream_deserialize(cls, f):
prev_out = OutPoint.stream_deserialize(f)
sequence = struct.unpack(b'<I', ser_read(f, 4))[0]
value = struct.unpack(b'<q', ser_read(f, 8))[0]
block_height = struct.unpack(b'<I', ser_read(f, 4))[0]
block_index = struct.unpack(b'<I', ser_read(f, 4))[0]
sig_script = BytesSerializer.stream_deserialize(f)
return cls(prev_out, sequence, value, block_height, block_index, sig_script)
def deserialize_field(self, tx, kwargs, attr, fmt, num_bytes, f):
if fmt not in ['inputs', 'outputs', 'bytes']:
kwargs[attr] = struct.unpack(fmt, ser_read(f, num_bytes))[0]
elif fmt == 'inputs':
kwargs[attr] = VectorSerializer.stream_deserialize(CMutableTxIn, f)
elif fmt == 'outputs':
kwargs[attr] = VectorSerializer.stream_deserialize(CMutableTxOut, f)
elif fmt == 'bytes':
kwargs[attr] = BytesSerializer.stream_deserialize(f)
def deserialize_witness(self, f):
value = struct.unpack(b'<q', ser_read(f, 8))[0]
block_height = struct.unpack(b'<I', ser_read(f, 4))[0]
block_index = struct.unpack(b'<I', ser_read(f, 4))[0]
sig_script = BytesSerializer.stream_deserialize(f)
self.value = value
self.block_height = block_height
self.block_index = block_index
self.sig_script = sig_script
def stream_deserialize(cls, f):
self = super(Block, cls).stream_deserialize(f)
for attr, fmt, num_bytes, _ in self.block_fields:
if fmt not in ['bytes', 'vectortx']:
setattr(self, attr, struct.unpack(fmt, ser_read(f, num_bytes))[0])
elif fmt == 'bytes':
setattr(self, attr, BytesSerializer.stream_deserialize(f))
elif fmt == 'vectortx':
setattr(self, attr, VectorSerializer.stream_deserialize(Transaction, f))
setattr(self, 'vMerkleTree', tuple(Block.build_merkle_tree_from_txs(getattr(self, 'vtx'))))
return self
def stream_deserialize(cls, f):
self = cls()
for attr, fmt, num_bytes, _ in self.fields:
if fmt not in ['inputs', 'outputs', 'bytes']:
setattr(self, attr, struct.unpack(fmt, ser_read(f, num_bytes))[0])
elif fmt == 'inputs':
setattr(self, attr, VectorSerializer.stream_deserialize(CTxIn, f))
elif fmt == 'outputs':
setattr(self, attr, VectorSerializer.stream_deserialize(CTxOut, f))
elif fmt == 'bytes':
setattr(self, attr, BytesSerializer.stream_deserialize(f))
return self
def stream_deserialize(cls, f):
value = struct.unpack(b'<q', ser_read(f, 8))[0]
version = struct.unpack(b'<H', ser_read(f, 2))[0]
pk_script = BytesSerializer.stream_deserialize(f)
return cls(value, version, pk_script)
def deserialize_witness_value_signing(self, f):
value = struct.unpack(b'<q', ser_read(f, 8))[0]
sig_script = BytesSerializer.stream_deserialize(f)
self.value = value
self.sig_script = sig_script
def deserialize_witness_signing(self, f):
sig_script = BytesSerializer.stream_deserialize(f)
self.sig_script = sig_script
def stream_deserialize(cls, f):
hash = ser_read(f, 32)
vin = CTxIn.stream_deserialize(f)
sig = BytesSerializer.stream_deserialize(f)
height = struct.unpack(b"<I", ser_read(f, 4))[0]
return cls(hash, vin, sig, height)
def stream_deserialize(cls, f):
hash = ser_read(f, 32)
vin = CTxIn.stream_deserialize(f)
sig = BytesSerializer.stream_deserialize(f)
height = struct.unpack(b"<I", ser_read(f, 4))[0]
return cls(hash, vin, sig, height)
def stream_deserialize(cls, f, **kwargs):
schema_obj = kwargs['schema_obj'] if 'schema_obj' in kwargs else None
if not isinstance(schema_obj, Schema):
raise ValueError(
f'`schema_obj` parameter must be of Schema type; got `{schema_obj}` instead'
)
# Deserialize proof header
# - version with flag
(ver, flag) = FlagVarIntSerializer.stream_deserialize(f)
# - fields common for root and upgrade proofs
if flag:
schema = Hash256Id.stream_deserialize(f)
network = VarIntSerializer.stream_deserialize(f)
if network is 0x00:
format = ProofFormat.upgrade
# - root-specific fields
else:
network = Network(network)
format = ProofFormat.root
root = OutPoint.stream_deserialize(f, short=False)
else:
format = ProofFormat.ordinary
# Deserialize proof body
# - reading proof type
type_no = ser_read(f, 1)[0]
# - reading `seal_sequence` structure
seals = []
seal_type_no = 0
# -- we iterate over the seals until 0xFF (=FlagVarIntSerializer.Separator.EOF) byte is met
while True:
try:
# -- reading seal with the current type number
seal = Seal.stream_deserialize(f,
type_no=seal_type_no,
schema_obj=schema_obj)
except BaseException as ex:
# due to some strange bug, python 3 is unable to capture SeparatorByteSignal exception by its type,
# and `isinstance(ex, SeparatorByteSignal)` returns False as well :(
# so we have to capture generic exception and re-raise if it is not SeparatorByteSignal, which
# can be determined only by the presence of its method
if not callable(getattr(ex, "is_eol", None)):
raise
if ex.is_eol():
# -- met 0xFE separator byte, increasing current type number
seal_type_no = seal_type_no + 1
elif ex.is_eof():
# -- end of `seal_sequence` structure
break
else:
# -- otherwise append read seal to the list of seals
seals.append(seal)
# -- if we had zero seals implies proof of state destruction format
if len(seals) is 0:
format = ProofFormat.burn
# - reading unparsed state and metadata bytes
state = BytesSerializer.stream_deserialize(f)
metadata = BytesSerializer.stream_deserialize(f)
# Deserialize original public key
pkcode = ser_read(f, 1)
if pkcode is 0x00:
pubkey = None
else:
buf = pkcode + ser_read(f, 32)
pubkey = PubKey.deserialize(buf)
# Deserialize prunable data
try:
pruned_flag = ser_read(f, 1)
except:
pruned_flag = 0x00
txid, parents = None, None
if pruned_flag & 0x01 > 0:
txid = Hash256Id.stream_deserialize(f)
if pruned_flag & 0x02 > 0:
parents = VectorSerializer.stream_deserialize(Hash256Id, f)
proof = Proof(schema_obj=schema_obj,
type_no=type_no,
ver=ver,
format=format,
schema=schema,
network=network,
root=root,
pubkey=pubkey,
fields=None,
seals=seals,
txid=txid,
parents=parents,
metadata=metadata,
state=state)
# Parsing raw seals and metadata and resolving types against the provided Schema
if 'schema_obj' in kwargs:
schema_obj = kwargs['schema_obj']
if isinstance(schema_obj, Schema):
proof.resolve_schema(schema_obj)
return proof
