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#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2012 thomasv@ecdsa.org
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import threading, time, Queue, os, sys, shutil
from util import user_dir, appdata_dir, print_error
from bitcoin import *
class TxVerifier(threading.Thread):
""" Simple Payment Verification """
def __init__(self, network, storage):
threading.Thread.__init__(self)
self.daemon = True
self.storage = storage
self.network = network
self.transactions = {} # requested verifications (with height sent by the requestor)
self.verified_tx = storage.get('verified_tx3',{}) # height, timestamp of verified transactions
self.merkle_roots = storage.get('merkle_roots',{}) # hashed by me
self.lock = threading.Lock()
self.running = False
self.queue = Queue.Queue()
def get_confirmations(self, tx):
""" return the number of confirmations of a monitored transaction. """
with self.lock:
if tx in self.verified_tx:
height, timestamp, pos = self.verified_tx[tx]
conf = (self.network.get_local_height() - height + 1)
if conf <= 0: timestamp = None
elif tx in self.transactions:
conf = -1
timestamp = None
else:
conf = 0
timestamp = None
return conf, timestamp
def get_txpos(self, tx_hash):
"return position, even if the tx is unverified"
with self.lock:
x = self.verified_tx.get(tx_hash)
y = self.transactions.get(tx_hash)
if x:
height, timestamp, pos = x
return height, pos
elif y:
return y, 0
else:
return 1e12, 0
def get_height(self, tx_hash):
with self.lock:
v = self.verified_tx.get(tx_hash)
height = v[0] if v else None
return height
def add(self, tx_hash, tx_height):
""" add a transaction to the list of monitored transactions. """
assert tx_height > 0
with self.lock:
if tx_hash not in self.transactions.keys():
self.transactions[tx_hash] = tx_height
def stop(self):
with self.lock: self.running = False
def is_running(self):
with self.lock: return self.running
def run(self):
with self.lock:
self.running = True
requested_merkle = []
while self.is_running():
# request missing tx
for tx_hash, tx_height in self.transactions.items():
if tx_hash not in self.verified_tx:
# do not request merkle branch before headers are available
if tx_height > self.network.get_local_height():
continue
if self.merkle_roots.get(tx_hash) is None and tx_hash not in requested_merkle:
if self.network.send([ ('blockchain.transaction.get_merkle',[tx_hash, tx_height]) ], self.queue.put):
print_error('requesting merkle', tx_hash)
requested_merkle.append(tx_hash)
try:
r = self.queue.get(timeout=0.1)
except Queue.Empty:
continue
if not r: continue
if r.get('error'):
print_error('Verifier received an error:', r)
continue
# 3. handle response
method = r['method']
params = r['params']
result = r['result']
if method == 'blockchain.transaction.get_merkle':
tx_hash = params[0]
self.verify_merkle(tx_hash, result)
def verify_merkle(self, tx_hash, result):
tx_height = result.get('block_height')
pos = result.get('pos')
merkle_root = self.hash_merkle_root(result['merkle'], tx_hash, pos)
header = self.network.get_header(tx_height)
if not header: return
if header.get('merkle_root') != merkle_root:
print_error("merkle verification failed for", tx_hash)
return
# we passed all the tests
self.merkle_roots[tx_hash] = merkle_root
timestamp = header.get('timestamp')
with self.lock:
self.verified_tx[tx_hash] = (tx_height, timestamp, pos)
print_error("verified %s"%tx_hash)
self.storage.put('verified_tx3', self.verified_tx, True)
self.network.trigger_callback('updated')
def hash_merkle_root(self, merkle_s, target_hash, pos):
h = hash_decode(target_hash)
for i in range(len(merkle_s)):
item = merkle_s[i]
h = Hash( hash_decode(item) + h ) if ((pos >> i) & 1) else Hash( h + hash_decode(item) )
return hash_encode(h)
def undo_verifications(self, height):
with self.lock:
items = self.verified_tx.items()[:]
for tx_hash, item in items:
tx_height, timestamp, pos = item
if tx_height >= height:
print_error("redoing", tx_hash)
with self.lock:
self.verified_tx.pop(tx_hash)
if tx_hash in self.merkle_roots:
self.merkle_roots.pop(tx_hash)