ff9b436163
Github-Pull: #7778 Rebased-From: fa524d9ddbad0a03f9eb974100fb3b6001045645 fa2cea163b49a97e2a18aa125e41170d60ce59cc faaa3c9b6546d9a64cece4ff0223f0b167feb6ff 444480649f08e6037f8ac178224b30a82e9ad72e
140 lines
4.3 KiB
Python
140 lines
4.3 KiB
Python
# BlockStore: a helper class that keeps a map of blocks and implements
|
|
# helper functions for responding to getheaders and getdata,
|
|
# and for constructing a getheaders message
|
|
#
|
|
|
|
from .mininode import *
|
|
import dbm
|
|
from io import BytesIO
|
|
|
|
class BlockStore(object):
|
|
def __init__(self, datadir):
|
|
self.blockDB = dbm.open(datadir + "/blocks", 'c')
|
|
self.currentBlock = 0L
|
|
self.headers_map = dict()
|
|
|
|
def close(self):
|
|
self.blockDB.close()
|
|
|
|
def get(self, blockhash):
|
|
serialized_block = None
|
|
try:
|
|
serialized_block = self.blockDB[repr(blockhash)]
|
|
except KeyError:
|
|
return None
|
|
f = BytesIO(serialized_block)
|
|
ret = CBlock()
|
|
ret.deserialize(f)
|
|
ret.calc_sha256()
|
|
return ret
|
|
|
|
def get_header(self, blockhash):
|
|
try:
|
|
return self.headers_map[blockhash]
|
|
except KeyError:
|
|
return None
|
|
|
|
# Note: this pulls full blocks out of the database just to retrieve
|
|
# the headers -- perhaps we could keep a separate data structure
|
|
# to avoid this overhead.
|
|
def headers_for(self, locator, hash_stop, current_tip=None):
|
|
if current_tip is None:
|
|
current_tip = self.currentBlock
|
|
current_block_header = self.get_header(current_tip)
|
|
if current_block_header is None:
|
|
return None
|
|
|
|
response = msg_headers()
|
|
headersList = [ current_block_header ]
|
|
maxheaders = 2000
|
|
while (headersList[0].sha256 not in locator.vHave):
|
|
prevBlockHash = headersList[0].hashPrevBlock
|
|
prevBlockHeader = self.get_header(prevBlockHash)
|
|
if prevBlockHeader is not None:
|
|
headersList.insert(0, prevBlockHeader)
|
|
else:
|
|
break
|
|
headersList = headersList[:maxheaders] # truncate if we have too many
|
|
hashList = [x.sha256 for x in headersList]
|
|
index = len(headersList)
|
|
if (hash_stop in hashList):
|
|
index = hashList.index(hash_stop)+1
|
|
response.headers = headersList[:index]
|
|
return response
|
|
|
|
def add_block(self, block):
|
|
block.calc_sha256()
|
|
try:
|
|
self.blockDB[repr(block.sha256)] = bytes(block.serialize())
|
|
except TypeError as e:
|
|
print "Unexpected error: ", sys.exc_info()[0], e.args
|
|
self.currentBlock = block.sha256
|
|
self.headers_map[block.sha256] = CBlockHeader(block)
|
|
|
|
def add_header(self, header):
|
|
self.headers_map[header.sha256] = header
|
|
|
|
def get_blocks(self, inv):
|
|
responses = []
|
|
for i in inv:
|
|
if (i.type == 2): # MSG_BLOCK
|
|
block = self.get(i.hash)
|
|
if block is not None:
|
|
responses.append(msg_block(block))
|
|
return responses
|
|
|
|
def get_locator(self, current_tip=None):
|
|
if current_tip is None:
|
|
current_tip = self.currentBlock
|
|
r = []
|
|
counter = 0
|
|
step = 1
|
|
lastBlock = self.get(current_tip)
|
|
while lastBlock is not None:
|
|
r.append(lastBlock.hashPrevBlock)
|
|
for i in range(step):
|
|
lastBlock = self.get(lastBlock.hashPrevBlock)
|
|
if lastBlock is None:
|
|
break
|
|
counter += 1
|
|
if counter > 10:
|
|
step *= 2
|
|
locator = CBlockLocator()
|
|
locator.vHave = r
|
|
return locator
|
|
|
|
class TxStore(object):
|
|
def __init__(self, datadir):
|
|
self.txDB = dbm.open(datadir + "/transactions", 'c')
|
|
|
|
def close(self):
|
|
self.txDB.close()
|
|
|
|
def get(self, txhash):
|
|
serialized_tx = None
|
|
try:
|
|
serialized_tx = self.txDB[repr(txhash)]
|
|
except KeyError:
|
|
return None
|
|
f = BytesIO(serialized_tx)
|
|
ret = CTransaction()
|
|
ret.deserialize(f)
|
|
ret.calc_sha256()
|
|
return ret
|
|
|
|
def add_transaction(self, tx):
|
|
tx.calc_sha256()
|
|
try:
|
|
self.txDB[repr(tx.sha256)] = bytes(tx.serialize())
|
|
except TypeError as e:
|
|
print "Unexpected error: ", sys.exc_info()[0], e.args
|
|
|
|
def get_transactions(self, inv):
|
|
responses = []
|
|
for i in inv:
|
|
if (i.type == 1): # MSG_TX
|
|
tx = self.get(i.hash)
|
|
if tx is not None:
|
|
responses.append(msg_tx(tx))
|
|
return responses
|