def _is_valid_claim(self, claim, tx):
"""
TODO: must be the first update (for the claim) in tx if there is more than one
"""
if type(claim) == deserialize.ClaimUpdate:
claim_id = deserialize.claim_id_bytes_to_hex(claim.claim_id)
claim_name = self.get_claim_name(claim_id)
# claim is invalid if its name does not match
# what its updating
if claim_name != claim.name:
logger.warn('found invalid update, name mismatch,{}/{}'.format(
claim_name, claim.name))
return False
# claim is invalid if it does not spend the claim it
# is updating
for i in tx.get('inputs'):
txid = i['prevout_hash']
nout = i['prevout_n']
logger.warn(
"txid:{}, nout:{}, claim id:{}, claim id from outpoint:{}".
format(txid, nout, claim_id,
self.get_claim_id_from_outpoint(txid, nout)))
if claim_id == self.get_claim_id_from_outpoint(txid, nout):
return True
logger.warn(
"found invalid update, claim not found: {} for {}".format(
claim_id, claim.name))
return False
else:
return True
def _analyze_tx(self, txid, tx):
""" analyze transaction to get list of abandons and claims """
#dict of abandons where key = claim_id , value = {'txid', 'nout',}
abandons = dict()
#list of claims : [{'claim': , 'nout':, 'claim_id', 'claim_address': 'amount':}, ]
list_claims = []
for x in tx.get('inputs'):
claim_id = self.get_claim_id_from_outpoint(x['prevout_hash'],
x['prevout_n'])
if claim_id:
abandons[claim_id] = {
'txid': x['prevout_hash'],
'nout': x['prevout_n']
}
for x in tx.get('outputs'):
script = x.get('raw_output_script').decode('hex')
nout = x.get('index')
amount = x.get('value')
decoded_script = [s for s in deserialize.script_GetOp(script)]
out = deserialize.decode_claim_script(decoded_script)
if out is False:
continue
claim, claim_script = out
claim_address = deserialize.get_address_from_output_script(script)
if not self._is_valid_claim(claim, tx):
continue
if type(claim) in [
deserialize.NameClaim, deserialize.ClaimSupport
]:
claim_id = self._get_claim_id(txid, nout)
else: #ClaimUpdate
claim_id = deserialize.claim_id_bytes_to_hex(claim.claim_id)
del abandons[claim_id]
claim_info = {
'claim': claim,
'nout': nout,
'claim_id': claim_id,
'claim_address': claim_address,
'amount': amount
}
list_claims.append(claim_info)
return {
'abandons': abandons,
'claims': list_claims,
}
def _get_claim_id(self, txid, nout):
""" get claim id in hex from txid in hex and nout int """
claim_id = deserialize.claim_id_hash(
deserialize.rev_hex(txid).decode('hex'), nout)
claim_id = deserialize.claim_id_bytes_to_hex(claim_id)
return claim_id