本文整理匯總了Python中db.DB.getBlock方法的典型用法代碼示例。如果您正苦於以下問題：Python DB.getBlock方法的具體用法？Python DB.getBlock怎麽用？Python DB.getBlock使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類db.DB的用法示例。
在下文中一共展示了DB.getBlock方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: verify_block_chain
# 需要導入模塊: from db import DB [as 別名]
# 或者: from db.DB import getBlock [as 別名]
def verify_block_chain(self, debug=False):
from db import DB
d = DB()
log.info('Verifying blockchain...')
self.client.broadcast_info('Verifying blockchain')
latest_block_hash = d.getLatestBlockHash()
if not latest_block_hash:
return True
latest_block = d.getBlock(latest_block_hash)
return latest_block.verify(debug=debug)示例2: __init__
# 需要導入模塊: from db import DB [as 別名]
# 或者: from db.DB import getBlock [as 別名]
#.........這裏部分代碼省略.........
raise Exception('Not a Transaction object!')
for t in self.transactionList:
if t.hash_transaction() == trans.hash_transaction():
return
log.debug('Adding trans to block: %s', trans.hash_transaction())
self.transactionList.append(trans)
def computeMerkleRoot(self):
self.HashMerkleRoot = Utils.buildMerkleTree(self.transactionList)
def getPreviousBlockHash(self):
""" retrieves the previous block hash from the database """
return self.db.getLatestBlock()[0]
def pack(self, withoutReward=False):
""" Serializes the block into a byte array """
b = bytearray()
b.extend(self.HashPrevBlock) #32
b.extend(struct.pack('I', self.nonce)) #4
b.extend(struct.pack('B', self.target)) #1
if withoutReward:
num = len(self.transactionList) - 1
else:
num = len(self.transactionList)
b.extend(struct.pack('B', num)) #1
for i in range(num):
b.extend(self.transactionList[i].hash_transaction()) # 32
return b
def unpack(self, buf):
""" Deserializes a byte array into this block object """
offset = 0
self.HashPrevBlock = buf[offset:offset+32]
offset += 32
self.nonce = struct.unpack_from('I', buf, offset)[0]
offset += 4
self.target = struct.unpack_from('B', buf, offset)[0]
offset += 1
num_trans = struct.unpack_from('B', buf, offset)[0]
offset += 1
for i in range(num_trans):
h = buf[offset:offset+32]
log.debug('Unpacking: ', h)
trans = self.db.getTransactionByHash(h)
self.transactionList.append(trans)
offset += 32
log.debug('Block hash: %s', self.hash_block(hex=True, withoutReward=False))
log.debug('Block nonce: &d', self.nonce)
log.info('Block unpacked')
def store_block(self):
self.db.insertBlock(self)
def hash_block(self, hex=False, withoutReward=False):
""" hashes the block """
b = bytearray()
b.extend(self.pack(withoutReward=withoutReward))
self.hash = SHA256.new(b)
if hex:
return self.hash.hexdigest()
return self.hash.digest()
def finish_block(self):
""" verifies the block, then broadcasts it """
v = self.verify()
if v:
self.client.broadcast_block(self, ignore=True)
log.debug('Block verified')
self.store_block()
def verify(self, debug=False):
""" verifies the block """
log.debug('Finishing block')
verified = False
if debug:
log.info('Block hash: %s', self.hash_block(hex=True))
for t in self.transactionList:
if not t.verify(debug=debug):
log.warn('Invalid transaction in block')
return False
if not self.test_hash(self.hash_block(withoutReward=False), self.target):
log.warn('Block has doesn\'t match target!')
return False
prevBlock = self.db.getBlock(self.HashPrevBlock)
if prevBlock:
log.debug('Verifying previous block')
return prevBlock.verify(debug=debug)
return True
def test_hash(self, hash, target):
""" check if the last 'target' bits are zeros """
int_hash = int(struct.unpack_from('I', hash[-4:])[0])
low = (int_hash & -int_hash)
lowBit = -1
while (low):
low >>= 1
lowBit += 1
if lowBit == target:
log.info(bin(int_hash))
return lowBit == target