def check_script(vouts):
"""
Looks into the vouts list of a transaction and returns the op_return if one exists
:param vouts: lists of outputs of a transaction
:return: string representation of the op_return
"""
for vout in [v for v in vouts[::-1] if v['hex'].startswith('6a')]:
verb = BlockchainSpider.decode_op_return(vout['hex'])
action = Spoolverb.from_verb(verb).action
if action in Spoolverb.supported_actions:
return verb
raise Exception("Invalid ascribe transaction")
def check_script(vouts):
"""
Looks into the vouts list of a transaction and returns the op_return if one exists
:param vouts: lists of outputs of a transaction
:return: string representation of the op_return
"""
for vout in [v for v in vouts[::-1] if v['hex'].startswith('6a')]:
verb = BlockchainSpider.decode_op_return(vout['hex'])
action = Spoolverb.from_verb(verb).action
if action in Spoolverb.supported_actions:
return verb
raise Exception("Invalid ascribe transaction")
def history(self, hash):
"""
Retrieve the ownership tree of all editions of a piece given the hash.
Args:
hash (str): Hash of the file to check. Can be created with the
:class:`File` class
Returns:
ownsership tree of all editions of a piece
.. note:: For now we only support searching the blockchain by
the piece hash.
"""
txs = self._t.get(hash, max_transactions=10000)['transactions']
tree = defaultdict(list)
number_editions = 0
for tx in txs:
_tx = self._t.get(tx['txid'])
txid = _tx['txid']
verb_str = BlockchainSpider.check_script(_tx['vouts'])
verb = Spoolverb.from_verb(verb_str)
from_address, to_address, piece_address = BlockchainSpider._get_addresses(_tx)
timestamp_utc = _tx['time']
action = verb.action
edition_number = 0
if action != 'EDITIONS':
edition_number = verb.edition_number
else:
number_editions = verb.num_editions
tree[edition_number].append({'txid': txid,
'verb': verb_str,
'from_address': from_address,
'to_address': to_address,
'piece_address': piece_address,
'timestamp_utc': timestamp_utc,
'action': action,
'number_editions': number_editions,
'edition_number': edition_number})
# lets update the records with the number of editions of the piece since we do not know
# this information before the EDITIONS transaction
for edition, chain in tree.iteritems():
[d.update({'number_editions': number_editions}) for d in chain]
return dict(tree)
def history(self, hash):
"""
Retrieve the ownership tree of all editions of a piece given the hash
:param hash: Hash of the file to check. Can be created with the File class
:return: ownsership tree of all editions of a piece
"""
# For now we only support searching the blockchain by the piece hash
txs = self._t.get(hash, max_transactions=10000)['transactions']
tree = defaultdict(list)
number_editions = 0
for tx in txs:
_tx = self._t.get(tx['txid'])
txid = _tx['txid']
verb_str = BlockchainSpider.check_script(_tx['vouts'])
verb = Spoolverb.from_verb(verb_str)
from_address, to_address, piece_address = BlockchainSpider._get_addresses(
_tx)
timestamp_utc = _tx['time']
action = verb.action
edition_number = 0
if action != 'EDITIONS':
edition_number = verb.edition_number
else:
number_editions = verb.num_editions
tree[edition_number].append({
'txid': txid,
'verb': verb_str,
'from_address': from_address,
'to_address': to_address,
'piece_address': piece_address,
'timestamp_utc': timestamp_utc,
'action': action,
'number_editions': number_editions,
'edition_number': edition_number
})
# lets update the records with the number of editions of the piece since we do not know
# this information before the EDITIONS transaction
for edition, chain in tree.iteritems():
[d.update({'number_editions': number_editions}) for d in chain]
return dict(tree)
