class Branch():
def __init__(self, log, database, lasthash, firsthash=None):
self.log = log
self.database = database
self.firsthash = firsthash
self.lasthash = lasthash
self.last = BlockIterator(database, lasthash)
def is_mainchain(self):
return (self.last.is_mainchain())
def work(self):
return sum(blk.get_blockheader().work() for blk in self)
def get_height(self):
return self.last.get_height()
def backward_iterblocks(self):
pos = self.database.get_block_handle(self.lasthash)
while pos.hasprev() and pos.hash != self.firsthash:
yield pos
pos = self.database.get_block_handle(
pos.blockindex.blockheader.hash_prev)
def foreward_iterblocks(self):
#accumulate and reverse hash_prev links (TODO: add a chain length limit)
blocks = list(self.backward_iterblocks())
blocks.reverse()
for blk in blocks:
yield blk
def __iter__(self):
return self.backward_iterblocks()
class Branch:
def __init__(self, log, database, lasthash, firsthash=None):
self.log = log
self.database = database
self.firsthash = firsthash
self.lasthash = lasthash
self.last = BlockIterator(database, lasthash)
def is_mainchain(self):
return self.last.is_mainchain()
def work(self):
return sum(blk.get_blockheader().work() for blk in self)
def get_height(self):
return self.last.get_height()
def backward_iterblocks(self):
pos = self.database.get_block_handle(self.lasthash)
while pos.hasprev() and pos.hash != self.firsthash:
yield pos
pos = self.database.get_block_handle(pos.blockindex.blockheader.hash_prev)
def foreward_iterblocks(self):
# accumulate and reverse hash_prev links (TODO: add a chain length limit)
blocks = list(self.backward_iterblocks())
blocks.reverse()
for blk in blocks:
yield blk
def __iter__(self):
return self.backward_iterblocks()
def get_block_locator(self):
block_locator = []
it = BlockIterator(self.database, self.database.get_mainchain())
stepsize = 1
while (it.hash != self.database.genesishash):
block_locator.append(it.hash)
i = 0
while it.hasprev() and i < stepsize:
it.prev()
i += 1
stepsize*= 2
#tmp speedup hack
#if stepsize >= 128:
# break
block_locator.append(self.database.genesishash)
return BlockLocator(1, block_locator)
def __init__(self, log, database, lasthash, firsthash=None):
self.log = log
self.database = database
self.firsthash = firsthash
self.lasthash = lasthash
self.last = BlockIterator(database, lasthash)
def __init__(self, log, database, lasthash, firsthash=None):
self.log = log
self.database = database
self.firsthash = firsthash
self.lasthash = lasthash
self.last = BlockIterator(database, lasthash)