def getBlocks(self, startHash, howmany, d):
""" Ask connected node for howmany blocks from best-block chain, callback d when we've got them all """
self._blocks_to_fetch = min(howmany, self.peerVersion.nStartingHeight)
self._blocks_fetched = 0
self._batch_remaining = 0
self._blocks = []
self._getBlocksCallback = d
m = msg_getblocks(version=self.ver_send)
if startHash is None:
m.locator = [ self.factory.genesis_value ]
else:
m.locator = [ startHash, self.factory.genesis_value ]
self.addHandler(msg_inv, self._gotInv) # ... expect inv message
self.sendMessage(m)
def _gotBlock(self, message):
blockhash = message.calc_sha256()
if blockhash not in self._expectedBlocks:
# Ignore blocks we're not expecting:
self.addHandler(msg_block, self._gotBlock) # Handle next block
return
self._blocks.append(message)
self._blocks_fetched += 1
self._batch_remaining -= 1
if self._blocks_fetched >= self._blocks_to_fetch:
d, self._getBlocksCallback = self._getBlocksCallback, None
blocks, self._blocks = self._blocks, None
d.callback(blocks)
elif self._batch_remaining == 0:
m = msg_getblocks(version=self.ver_send)
m.locator = [ blockhash, self.factory.genesis_value ]
self.addHandler(msg_inv, self._gotInv) # new round of getblocks --> inv
self.sendMessage(m)
else:
self.addHandler(msg_block, self._gotBlock) # Handle next block