/usr/lib/python2.7/dist-packages/electrum/verifier.py is in python-electrum 1.9.7-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | #!/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.blockchain = network.blockchain
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.blockchain.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:
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]) ], lambda i,r: self.queue.put(r)):
print_error('requesting merkle', tx_hash)
requested_merkle.append(tx_hash)
try:
r = self.queue.get(timeout=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)
requested_merkle.remove(tx_hash)
def verify_merkle(self, tx_hash, result):
tx_height = result.get('block_height')
pos = result.get('pos')
self.merkle_roots[tx_hash] = self.hash_merkle_root(result['merkle'], tx_hash, pos)
header = self.blockchain.read_header(tx_height)
if not header: return
assert header.get('merkle_root') == self.merkle_roots[tx_hash]
# we passed all the tests
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)
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