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98 lines
3.4 KiB
98 lines
3.4 KiB
#!/usr/bin/env python
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#
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# Electrum - lightweight Bitcoin client
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# Copyright (C) 2012 thomasv@ecdsa.org
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import threading
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import Queue
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import util
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from bitcoin import *
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class SPV(util.DaemonThread):
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""" Simple Payment Verification """
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def __init__(self, network, wallet):
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util.DaemonThread.__init__(self)
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self.wallet = wallet
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self.network = network
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self.merkle_roots = {} # hashed by me
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self.queue = Queue.Queue()
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def run(self):
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requested_merkle = set()
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while self.is_running():
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unverified = self.wallet.get_unverified_txs()
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for (tx_hash, tx_height) in unverified:
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if self.merkle_roots.get(tx_hash) is None and tx_hash not in requested_merkle:
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if self.network.send([ ('blockchain.transaction.get_merkle',[tx_hash, tx_height]) ], self.queue.put):
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self.print_error('requesting merkle', tx_hash)
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requested_merkle.add(tx_hash)
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try:
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r = self.queue.get(timeout=0.1)
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except Queue.Empty:
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continue
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if not r:
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continue
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if r.get('error'):
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self.print_error('Verifier received an error:', r)
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continue
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# 3. handle response
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method = r['method']
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params = r['params']
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result = r['result']
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if method == 'blockchain.transaction.get_merkle':
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tx_hash = params[0]
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self.verify_merkle(tx_hash, result)
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self.print_error("stopped")
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def verify_merkle(self, tx_hash, result):
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tx_height = result.get('block_height')
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pos = result.get('pos')
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merkle_root = self.hash_merkle_root(result['merkle'], tx_hash, pos)
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header = self.network.get_header(tx_height)
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if not header: return
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if header.get('merkle_root') != merkle_root:
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self.print_error("merkle verification failed for", tx_hash)
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return
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# we passed all the tests
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self.merkle_roots[tx_hash] = merkle_root
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self.print_error("verified %s" % tx_hash)
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self.wallet.add_verified_tx(tx_hash, (tx_height, header.get('timestamp'), pos))
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def hash_merkle_root(self, merkle_s, target_hash, pos):
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h = hash_decode(target_hash)
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for i in range(len(merkle_s)):
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item = merkle_s[i]
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h = Hash( hash_decode(item) + h ) if ((pos >> i) & 1) else Hash( h + hash_decode(item) )
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return hash_encode(h)
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def undo_verifications(self, height):
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tx_hashes = self.wallet.undo_verifications(height)
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for tx_hash in tx_hashes:
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self.print_error("redoing", tx_hash)
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self.merkle_roots.pop(tx_hash, None)
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