def test_negative_locktime():
"""
test for a negative locktime
"""
trns = make_synthetic_transaction(1)
trns["locktime"] = -1
assert tx.validate_transaction(trns) == False
def test_invalid_vout_length():
"""
test that the vout list length is not greater than
the maximum allowed by the Helium config
"""
trn = make_synthetic_transaction(11)
assert tx.validate_transaction(trn) == False
def test_missing_transactionid():
"""
test missing transaction id
"""
trns = make_synthetic_transaction(1)
del trns["transactionid"]
assert tx.validate_transaction(trns) == False
def test_zero_version_number():
"""
test zero version no
"""
trns = make_synthetic_transaction(1)
trns["version"] = 0
assert tx.validate_transaction(trns) == False
def test_bad_transactionid():
"""
test transaction id with an invalid length
"""
trns = make_synthetic_transaction(1)
# replace the last char with an invalid char
trns["transactionid"] = trns["transactionid"][:-1] + "z"
assert tx.validate_transaction(trns) == False
def test_empty_scriptSig_pubkey():
"""
test that ScriptSig public key field is not empty
"""
txn = make_synthetic_transaction(2)
indices = randomize_list(txn['vin'])
for ctr in list(range(len(indices))):
txn['vin'][indices[ctr]]['ScriptSig'][1] = ''
assert tx.validate_transaction(txn) == False
def test_negative_output_value(monkeypatch):
"""
test a negative transaction output value
"""
txn = make_synthetic_transaction(4)
indices = randomize_list(txn['vout'])
ctr = secrets.randbelow(len(indices))
monkeypatch.setitem(txn['vout'][indices[ctr]], 'value', -456712)
assert tx.validate_transaction(txn) == False
def test_scriptpubkey_length_error():
"""
test that ScriptPubKey list has a valid length
"""
txn = make_synthetic_transaction(4)
indices = randomize_list(txn['vout'])
for ctr in list(range(len(indices))):
element = txn['vout'][indices[ctr]]['ScriptPubKey'][1]
txn['vout'][indices[ctr]]['ScriptPubKey'].append(element)
assert tx.validate_transaction(txn) == False
def test_no_prev_tx_reference():
"""
test that the transaction's vin element has a
reference to a previous transaction.
"""
txn = make_synthetic_transaction(1)
indices = randomize_list(txn["vin"])
for ctr in list(range(len(indices))):
txn['vin'][indices[ctr]]['txid'] = ""
assert tx.validate_transaction(txn) == False
def test_invalid_txid_length():
"""
test a previous transaction id for length
"""
txn = make_synthetic_transaction(2)
id = rcrypt.make_uuid()
id = "p" + id[0:]
indices = randomize_list(txn['vin'])
ctr = secrets.randbelow(len(indices))
txn['vin'][indices[ctr]]['txid'] = id
assert tx.validate_transaction(txn) == False
def receive_transaction(transaction: "dictionary") -> "bool":
# verify that the incoming transaction is valid
if tx.validate_transaction(transaction) == False:
logging.debug('receive_transaction: miner received an invalid transaction')
return False
# do not add the transaction if it already exists in the mempool
for trans in mempool:
if trans == transaction: return True
# add the transaction to the mempool
mempool.append(transaction)
return True
def add_block(block: "dictionary") -> "bool":
"""
add_block: adds a block to the blockchain. Receives a block.
The block attributes are checked for validity and each transaction in the block is
tested for validity. If there are no errors, the block is written to a file as a
sequence of raw bytes. Then the block is added to the blockchain.
The chainstate database and the blk_index databases are updated.
returns True if the block is added to the blockchain and False otherwise
"""
try:
# validate the received block parameters
if validate_block(block) == False:
raise(ValueError("block validation error"))
# validate the transactions in the block
# update the chainstate database
for trx in block['tx']:
# first transaction in the block is a coinbase transaction
if block["height"] == 0 or block['tx'][0] == trx: zero_inputs = True
else: zero_inputs = False
if tx.validate_transaction(trx, zero_inputs) == False:
raise(ValueError("transaction validation error"))
if hchaindb.transaction_update(trx) == False:
raise(ValueError("chainstate update transaction error"))
# serialize the block to a file
if (serialize_block(block) == False):
raise(ValueError("serialize block error"))
# add the block to the blockchain in memory
blockchain.append(block)
# update the blk_index
for transaction in block['tx']:
blockindex.put_index(transaction["transactionid"], block["height"])
except Exception as err:
print(str(err))
logging.debug('add_block: exception: ' + str(err))
return False
return True
def receive_mined_block(block):
# verify the proof of work
if proof_of_work(block) == False:
logging.debug("receive_mined_block: no proof of work")
return False
# Verify that the block is valid. Note that because of the False parameter
# we are not validating the value of the block's previousblockhash value
ret = bchain.validate_block(block, False)
if ret == False:
logging.debug('receive_mined_block: block is invalid')
return False
# validate transactions in the block
for trans in block['tx']:
if tx.validate_transaction(trans) == False:
logging.debug("receive_mined_block: invalid transaction")
return False
# test if block is in the received_blocks list
for blk in received_blocks:
if blk == block: return False
#test if block is in the primary or secondary blockchains
if len(bchain.blockchain) > 0:
if block == bchain.blockchain[-1]: return False
if len(bchain.blockchain) > 1:
if block == bchain.blockchain[-2]: return False
if len(bchain.secondary_blockchain) > 0:
if block == bchain.secondary_blockchain[-1]: return False
if len(bchain.secondary_blockchain) > 1:
if block == bchain.secondary_blockchain[-2]: return False
# add the block to the blocks_received list
received_blocks.append(block)
return True
def receive_transaction(transaction: "dictionary") -> "bool":
"""
receives a transaction propagating over the P2P cryptocurrency network
this function executes in a thread
"""
# do not add the transaction if:
# it already exists in the mempool
# it exists in the Chainstate
# it is invalid
try:
# if the transaction is in the mempool, return
for trans in mempool:
if trans == transaction: return False
# do not add the transaction if it has been accounted for in
# the chainstate database.
tx_fragment_id = transaction["transactionid"] + "_" + "0"
if hchaindb.get_transaction(tx_fragment_id) != False:
return True
# verify that the incoming transaction is valid
if len(transaction["vin"]) > 0: zero_inputs = False
else: zero_inputs = True
if tx.validate_transaction(transaction, zero_inputs) == False:
raise (ValueError("invalid transaction received"))
# add the transaction to the mempool
mempool.append(transaction)
# place the transaction on the P2P network for further
# propagation
propagate_transaction(transaction)
except Exception as err:
logging.debug('receive_transaction: exception: ' + str(err))
return False
return True
def test_type_transaction():
"""
test transaction type
"""
assert tx.validate_transaction([]) == False