interface.start(wait = False)
interface.send([('server.peers.subscribe',[])])
- gui = gui.ElectrumGui(config,interface)
+ blockchain = BlockchainVerifier(interface, config)
+ blockchain.start()
+
+ gui = gui.ElectrumGui(config, interface, blockchain)
gui.main(url)
interface.stop()
+ blockchain.stop()
# we use daemon threads, their termination is enforced.
# this sleep command gives them time to terminate cleanly.
from electrum.wallet import format_satoshis
from electrum.bitcoin import Transaction, is_valid
from electrum import mnemonic
-from electrum import util, bitcoin, commands, Interface, Wallet, WalletVerifier, WalletSynchronizer
+from electrum import util, bitcoin, commands, Interface, Wallet, TxVerifier, WalletSynchronizer
from electrum import SimpleConfig, Wallet, WalletSynchronizer, WalletStorage
self.wallet.interface.register_callback('disconnected', lambda: self.emit(QtCore.SIGNAL('update_status')))
self.wallet.interface.register_callback('disconnecting', lambda: self.emit(QtCore.SIGNAL('update_status')))
self.wallet.interface.register_callback('new_transaction', lambda: self.emit(QtCore.SIGNAL('transaction_signal')))
- title = 'Electrum ' + self.wallet.electrum_version + ' - ' #+ self.config.path
+ title = 'Electrum ' + self.wallet.electrum_version + ' - ' + self.wallet.storage.path
if not self.wallet.seed: title += ' [%s]' % (_('seedless'))
self.setWindowTitle( title )
self.update_wallet()
return
interface = self.wallet.interface
- verifier = self.wallet.verifier
+ blockchain = self.wallet.verifier.blockchain
+
+ self.wallet.verifier.stop()
self.wallet.synchronizer.stop()
# create wallet
wallet = Wallet(storage)
wallet.interface = interface
- wallet.verifier = verifier
+
+ verifier = TxVerifier(interface, blockchain, storage)
+ verifier.start()
+ wallet.set_verifier(verifier)
+
synchronizer = WalletSynchronizer(wallet)
synchronizer.start()
class ElectrumGui:
- def __init__(self, config, interface, app=None):
+ def __init__(self, config, interface, blockchain, app=None):
self.interface = interface
self.config = config
+ self.blockchain = blockchain
self.windows = []
self.efilter = OpenFileEventFilter(self.windows)
if app is None:
wallet.interface = self.interface
- verifier = WalletVerifier(self.interface, storage)
+ verifier = TxVerifier(self.interface, self.blockchain, storage)
verifier.start()
wallet.set_verifier(verifier)
+
synchronizer = WalletSynchronizer(wallet)
synchronizer.start()
from util import format_satoshis, print_msg, print_json, print_error, set_verbosity
from wallet import WalletSynchronizer, WalletStorage
from wallet_factory import WalletFactory as Wallet
-from verifier import WalletVerifier
+from verifier import TxVerifier
+from blockchain import BlockchainVerifier
from interface import Interface, pick_random_server, DEFAULT_SERVERS
from simple_config import SimpleConfig
import bitcoin
--- /dev/null
+#!/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 BlockchainVerifier(threading.Thread):
+ """ Simple Payment Verification """
+
+ def __init__(self, interface, config):
+ threading.Thread.__init__(self)
+ self.daemon = True
+ self.config = config
+ self.interface = interface
+ self.interface.register_channel('verifier')
+ self.lock = threading.Lock()
+ self.pending_headers = [] # headers that have not been verified
+ self.height = 0
+ self.local_height = 0
+ self.running = False
+ self.headers_url = 'http://headers.electrum.org/blockchain_headers'
+
+
+ def stop(self):
+ with self.lock: self.running = False
+ self.interface.poke('verifier')
+
+ def is_running(self):
+ with self.lock: return self.running
+
+ def run(self):
+
+ self.init_headers_file()
+ self.set_local_height()
+
+ with self.lock:
+ self.running = True
+ requested_merkle = []
+ requested_chunks = []
+ requested_headers = []
+ all_chunks = False
+
+ # subscribe to block headers
+ self.interface.send([ ('blockchain.headers.subscribe',[])], 'verifier')
+
+ while self.is_running():
+ # request missing chunks
+ if not all_chunks and self.height and not requested_chunks:
+
+ if self.local_height + 50 < self.height:
+ min_index = (self.local_height + 1)/2016
+ max_index = (self.height + 1)/2016
+ for i in range(min_index, max_index + 1):
+ print_error( "requesting chunk", i )
+ self.interface.send([ ('blockchain.block.get_chunk',[i])], 'verifier')
+ requested_chunks.append(i)
+ break
+ else:
+ all_chunks = True
+ print_error("downloaded all chunks")
+
+
+ # process pending headers
+ if self.pending_headers and all_chunks:
+ done = []
+ for header in self.pending_headers:
+ if self.verify_header(header):
+ done.append(header)
+ else:
+ # request previous header
+ i = header.get('block_height') - 1
+ if i not in requested_headers:
+ print_error("requesting header %d"%i)
+ self.interface.send([ ('blockchain.block.get_header',[i])], 'verifier')
+ requested_headers.append(i)
+ # no point continuing
+ break
+ if done:
+ self.interface.trigger_callback('updated')
+ for header in done:
+ self.pending_headers.remove(header)
+
+ try:
+ r = self.interface.get_response('verifier',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.block.get_chunk':
+ index = params[0]
+ self.verify_chunk(index, result)
+ requested_chunks.remove(index)
+
+ elif method in ['blockchain.headers.subscribe', 'blockchain.block.get_header']:
+
+ self.pending_headers.append(result)
+ if method == 'blockchain.block.get_header':
+ requested_headers.remove(result.get('block_height'))
+ else:
+ self.height = result.get('block_height')
+ self.interface.poke('synchronizer')
+
+ self.pending_headers.sort(key=lambda x: x.get('block_height'))
+ # print "pending headers", map(lambda x: x.get('block_height'), self.pending_headers)
+
+
+
+
+
+ def verify_chunk(self, index, hexdata):
+ data = hexdata.decode('hex')
+ height = index*2016
+ num = len(data)/80
+ print_error("validating headers %d"%height)
+
+ if index == 0:
+ previous_hash = ("0"*64)
+ else:
+ prev_header = self.read_header(index*2016-1)
+ if prev_header is None: raise
+ previous_hash = self.hash_header(prev_header)
+
+ bits, target = self.get_target(index)
+
+ for i in range(num):
+ height = index*2016 + i
+ raw_header = data[i*80:(i+1)*80]
+ header = self.header_from_string(raw_header)
+ _hash = self.hash_header(header)
+ assert previous_hash == header.get('prev_block_hash')
+ assert bits == header.get('bits')
+ assert eval('0x'+_hash) < target
+
+ previous_header = header
+ previous_hash = _hash
+
+ self.save_chunk(index, data)
+
+
+ def verify_header(self, header):
+ # add header to the blockchain file
+ # if there is a reorg, push it in a stack
+
+ height = header.get('block_height')
+
+ prev_header = self.read_header(height -1)
+ if not prev_header:
+ # return False to request previous header
+ return False
+
+ prev_hash = self.hash_header(prev_header)
+ bits, target = self.get_target(height/2016)
+ _hash = self.hash_header(header)
+ try:
+ assert prev_hash == header.get('prev_block_hash')
+ assert bits == header.get('bits')
+ assert eval('0x'+_hash) < target
+ except:
+ # this can be caused by a reorg.
+ print_error("verify header failed"+ repr(header))
+ # undo verifications
+ 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)
+ # return False to request previous header.
+ return False
+
+ self.save_header(header)
+ print_error("verify header:", _hash, height)
+ return True
+
+
+
+
+ def header_to_string(self, res):
+ s = int_to_hex(res.get('version'),4) \
+ + rev_hex(res.get('prev_block_hash')) \
+ + rev_hex(res.get('merkle_root')) \
+ + int_to_hex(int(res.get('timestamp')),4) \
+ + int_to_hex(int(res.get('bits')),4) \
+ + int_to_hex(int(res.get('nonce')),4)
+ return s
+
+
+ def header_from_string(self, s):
+ hex_to_int = lambda s: eval('0x' + s[::-1].encode('hex'))
+ h = {}
+ h['version'] = hex_to_int(s[0:4])
+ h['prev_block_hash'] = hash_encode(s[4:36])
+ h['merkle_root'] = hash_encode(s[36:68])
+ h['timestamp'] = hex_to_int(s[68:72])
+ h['bits'] = hex_to_int(s[72:76])
+ h['nonce'] = hex_to_int(s[76:80])
+ return h
+
+ def hash_header(self, header):
+ return rev_hex(Hash(self.header_to_string(header).decode('hex')).encode('hex'))
+
+ def path(self):
+ wdir = self.config.get('blockchain_headers_path', user_dir())
+ if wdir and not os.path.exists( wdir ): os.mkdir(wdir)
+ return os.path.join( wdir, 'blockchain_headers')
+
+ def init_headers_file(self):
+ filename = self.path()
+ if os.path.exists(filename):
+ return
+
+ try:
+ import urllib, socket
+ socket.setdefaulttimeout(30)
+ print_error("downloading ", self.headers_url )
+ urllib.urlretrieve(self.headers_url, filename)
+ except:
+ print_error( "download failed. creating file", filename )
+ open(filename,'wb+').close()
+
+ def save_chunk(self, index, chunk):
+ filename = self.path()
+ f = open(filename,'rb+')
+ f.seek(index*2016*80)
+ h = f.write(chunk)
+ f.close()
+ self.set_local_height()
+
+ def save_header(self, header):
+ data = self.header_to_string(header).decode('hex')
+ assert len(data) == 80
+ height = header.get('block_height')
+ filename = self.path()
+ f = open(filename,'rb+')
+ f.seek(height*80)
+ h = f.write(data)
+ f.close()
+ self.set_local_height()
+
+
+ def set_local_height(self):
+ name = self.path()
+ if os.path.exists(name):
+ h = os.path.getsize(name)/80 - 1
+ if self.local_height != h:
+ self.local_height = h
+
+
+ def read_header(self, block_height):
+ name = self.path()
+ if os.path.exists(name):
+ f = open(name,'rb')
+ f.seek(block_height*80)
+ h = f.read(80)
+ f.close()
+ if len(h) == 80:
+ h = self.header_from_string(h)
+ return h
+
+
+ def get_target(self, index):
+
+ max_target = 0x00000000FFFF0000000000000000000000000000000000000000000000000000
+ if index == 0: return 0x1d00ffff, max_target
+
+ first = self.read_header((index-1)*2016)
+ last = self.read_header(index*2016-1)
+
+ nActualTimespan = last.get('timestamp') - first.get('timestamp')
+ nTargetTimespan = 14*24*60*60
+ nActualTimespan = max(nActualTimespan, nTargetTimespan/4)
+ nActualTimespan = min(nActualTimespan, nTargetTimespan*4)
+
+ bits = last.get('bits')
+ # convert to bignum
+ MM = 256*256*256
+ a = bits%MM
+ if a < 0x8000:
+ a *= 256
+ target = (a) * pow(2, 8 * (bits/MM - 3))
+
+ # new target
+ new_target = min( max_target, (target * nActualTimespan)/nTargetTimespan )
+
+ # convert it to bits
+ c = ("%064X"%new_target)[2:]
+ i = 31
+ while c[0:2]=="00":
+ c = c[2:]
+ i -= 1
+
+ c = eval('0x'+c[0:6])
+ if c > 0x800000:
+ c /= 256
+ i += 1
+
+ new_bits = c + MM * i
+ return new_bits, new_target
+
-class WalletVerifier(threading.Thread):
+class TxVerifier(threading.Thread):
""" Simple Payment Verification """
- def __init__(self, interface, config):
+ def __init__(self, interface, blockchain, storage):
threading.Thread.__init__(self)
self.daemon = True
- self.config = config
+ self.storage = storage
+ self.blockchain = blockchain
self.interface = interface
self.transactions = {} # requested verifications (with height sent by the requestor)
- self.interface.register_channel('verifier')
-
- self.verified_tx = config.get('verified_tx3',{}) # height, timestamp of verified transactions
- self.merkle_roots = config.get('merkle_roots',{}) # hashed by me
-
- self.targets = config.get('targets',{}) # compute targets
+ self.interface.register_channel('txverifier')
+ 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.pending_headers = [] # headers that have not been verified
- self.height = 0
- self.local_height = 0
self.running = False
- self.headers_url = 'http://headers.electrum.org/blockchain_headers'
+
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.local_height - height + 1)
+ conf = (self.blockchain.local_height - height + 1)
if conf <= 0: timestamp = None
elif tx in self.transactions:
def run(self):
- self.init_headers_file()
- self.set_local_height()
-
- with self.lock:
- self.running = True
- requested_merkle = []
- requested_chunks = []
- requested_headers = []
- all_chunks = False
-
- # subscribe to block headers
- self.interface.send([ ('blockchain.headers.subscribe',[])], 'verifier')
-
while self.is_running():
- # request missing chunks
- if not all_chunks and self.height and not requested_chunks:
-
- if self.local_height + 50 < self.height:
- min_index = (self.local_height + 1)/2016
- max_index = (self.height + 1)/2016
- for i in range(min_index, max_index + 1):
- print_error( "requesting chunk", i )
- self.interface.send([ ('blockchain.block.get_chunk',[i])], 'verifier')
- requested_chunks.append(i)
- break
- else:
- all_chunks = True
- print_error("downloaded all chunks")
-
# request missing tx
if all_chunks:
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:
print_error('requesting merkle', tx_hash)
- self.interface.send([ ('blockchain.transaction.get_merkle',[tx_hash, tx_height]) ], 'verifier')
+ self.interface.send([ ('blockchain.transaction.get_merkle',[tx_hash, tx_height]) ], 'txverifier')
requested_merkle.append(tx_hash)
- # process pending headers
- if self.pending_headers and all_chunks:
- done = []
- for header in self.pending_headers:
- if self.verify_header(header):
- done.append(header)
- else:
- # request previous header
- i = header.get('block_height') - 1
- if i not in requested_headers:
- print_error("requesting header %d"%i)
- self.interface.send([ ('blockchain.block.get_header',[i])], 'verifier')
- requested_headers.append(i)
- # no point continuing
- break
- if done:
- self.interface.trigger_callback('updated')
- for header in done:
- self.pending_headers.remove(header)
-
try:
- r = self.interface.get_response('verifier',timeout=1)
+ r = self.interface.get_response('txverifier',timeout=1)
except Queue.Empty:
continue
if not r: continue
self.verify_merkle(tx_hash, result)
requested_merkle.remove(tx_hash)
- elif method == 'blockchain.block.get_chunk':
- index = params[0]
- self.verify_chunk(index, result)
- requested_chunks.remove(index)
-
- elif method in ['blockchain.headers.subscribe', 'blockchain.block.get_header']:
-
- self.pending_headers.append(result)
- if method == 'blockchain.block.get_header':
- requested_headers.remove(result.get('block_height'))
- else:
- self.height = result.get('block_height')
- self.interface.poke('synchronizer')
-
- self.pending_headers.sort(key=lambda x: x.get('block_height'))
- # print "pending headers", map(lambda x: x.get('block_height'), self.pending_headers)
-
-
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.read_header(tx_height)
+ 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
with self.lock:
self.verified_tx[tx_hash] = (tx_height, timestamp, pos)
print_error("verified %s"%tx_hash)
- self.config.set_key('verified_tx3', self.verified_tx, True)
+ self.storage.set_key('verified_tx3', self.verified_tx, True)
self.interface.trigger_callback('updated')
- def verify_chunk(self, index, hexdata):
- data = hexdata.decode('hex')
- height = index*2016
- num = len(data)/80
- print_error("validating headers %d"%height)
-
- if index == 0:
- previous_hash = ("0"*64)
- else:
- prev_header = self.read_header(index*2016-1)
- if prev_header is None: raise
- previous_hash = self.hash_header(prev_header)
-
- bits, target = self.get_target(index)
-
- for i in range(num):
- height = index*2016 + i
- raw_header = data[i*80:(i+1)*80]
- header = self.header_from_string(raw_header)
- _hash = self.hash_header(header)
- assert previous_hash == header.get('prev_block_hash')
- assert bits == header.get('bits')
- assert eval('0x'+_hash) < target
-
- previous_header = header
- previous_hash = _hash
-
- self.save_chunk(index, data)
-
-
- def verify_header(self, header):
- # add header to the blockchain file
- # if there is a reorg, push it in a stack
-
- height = header.get('block_height')
-
- prev_header = self.read_header(height -1)
- if not prev_header:
- # return False to request previous header
- return False
-
- prev_hash = self.hash_header(prev_header)
- bits, target = self.get_target(height/2016)
- _hash = self.hash_header(header)
- try:
- assert prev_hash == header.get('prev_block_hash')
- assert bits == header.get('bits')
- assert eval('0x'+_hash) < target
- except:
- # this can be caused by a reorg.
- print_error("verify header failed"+ repr(header))
- # undo verifications
- 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)
- # return False to request previous header.
- return False
-
- self.save_header(header)
- print_error("verify header:", _hash, height)
- return True
-
-
-
-
- def header_to_string(self, res):
- s = int_to_hex(res.get('version'),4) \
- + rev_hex(res.get('prev_block_hash')) \
- + rev_hex(res.get('merkle_root')) \
- + int_to_hex(int(res.get('timestamp')),4) \
- + int_to_hex(int(res.get('bits')),4) \
- + int_to_hex(int(res.get('nonce')),4)
- return s
-
-
- def header_from_string(self, s):
- hex_to_int = lambda s: eval('0x' + s[::-1].encode('hex'))
- h = {}
- h['version'] = hex_to_int(s[0:4])
- h['prev_block_hash'] = hash_encode(s[4:36])
- h['merkle_root'] = hash_encode(s[36:68])
- h['timestamp'] = hex_to_int(s[68:72])
- h['bits'] = hex_to_int(s[72:76])
- h['nonce'] = hex_to_int(s[76:80])
- return h
-
- def hash_header(self, header):
- return rev_hex(Hash(self.header_to_string(header).decode('hex')).encode('hex'))
-
def hash_merkle_root(self, merkle_s, target_hash, pos):
h = hash_decode(target_hash)
for i in range(len(merkle_s)):
h = Hash( hash_decode(item) + h ) if ((pos >> i) & 1) else Hash( h + hash_decode(item) )
return hash_encode(h)
- def path(self):
- wdir = self.config.get('blockchain_headers_path', user_dir())
- if wdir and not os.path.exists( wdir ): os.mkdir(wdir)
- return os.path.join( wdir, 'blockchain_headers')
-
- def init_headers_file(self):
- filename = self.path()
- if os.path.exists(filename):
- return
-
- try:
- import urllib, socket
- socket.setdefaulttimeout(30)
- print_error("downloading ", self.headers_url )
- urllib.urlretrieve(self.headers_url, filename)
- except:
- print_error( "download failed. creating file", filename )
- open(filename,'wb+').close()
-
- def save_chunk(self, index, chunk):
- filename = self.path()
- f = open(filename,'rb+')
- f.seek(index*2016*80)
- h = f.write(chunk)
- f.close()
- self.set_local_height()
-
- def save_header(self, header):
- data = self.header_to_string(header).decode('hex')
- assert len(data) == 80
- height = header.get('block_height')
- filename = self.path()
- f = open(filename,'rb+')
- f.seek(height*80)
- h = f.write(data)
- f.close()
- self.set_local_height()
-
-
- def set_local_height(self):
- name = self.path()
- if os.path.exists(name):
- h = os.path.getsize(name)/80 - 1
- if self.local_height != h:
- self.local_height = h
-
-
- def read_header(self, block_height):
- name = self.path()
- if os.path.exists(name):
- f = open(name,'rb')
- f.seek(block_height*80)
- h = f.read(80)
- f.close()
- if len(h) == 80:
- h = self.header_from_string(h)
- return h
-
-
- def get_target(self, index):
-
- max_target = 0x00000000FFFF0000000000000000000000000000000000000000000000000000
- if index == 0: return 0x1d00ffff, max_target
-
- first = self.read_header((index-1)*2016)
- last = self.read_header(index*2016-1)
-
- nActualTimespan = last.get('timestamp') - first.get('timestamp')
- nTargetTimespan = 14*24*60*60
- nActualTimespan = max(nActualTimespan, nTargetTimespan/4)
- nActualTimespan = min(nActualTimespan, nTargetTimespan*4)
-
- bits = last.get('bits')
- # convert to bignum
- MM = 256*256*256
- a = bits%MM
- if a < 0x8000:
- a *= 256
- target = (a) * pow(2, 8 * (bits/MM - 3))
-
- # new target
- new_target = min( max_target, (target * nActualTimespan)/nTargetTimespan )
-
- # convert it to bits
- c = ("%064X"%new_target)[2:]
- i = 31
- while c[0:2]=="00":
- c = c[2:]
- i -= 1
-
- c = eval('0x'+c[0:6])
- if c > 0x800000:
- c /= 256
- i += 1
-
- new_bits = c + MM * i
- return new_bits, new_target
+
+
'electrum.wallet_bitkey',
'electrum.wallet_factory',
'electrum.interface',
+ 'electrum.blockchain',
'electrum.commands',
'electrum.mnemonic',
'electrum.simple_config',
git://git.novaco.in / electrum-nvc.git / commitdiff