lib/wallet.py

   1 #!/usr/bin/env python
   2 #
   3 # Electrum - lightweight Bitcoin client
   4 # Copyright (C) 2011 thomasv@gitorious
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
  18
  19 import sys
  20 import base64
  21 import os
  22 import re
  23 import hashlib
  24 import copy
  25 import operator
  26 import ast
  27 import threading
  28 import random
  29 import aes
  30 import Queue
  31 import time
  32
  33 from util import print_msg, print_error, format_satoshis
  34 from bitcoin import *
  35 from account import *
  36 from transaction import Transaction
  37
  38 # AES encryption
  39 EncodeAES = lambda secret, s: base64.b64encode(aes.encryptData(secret,s))
  40 DecodeAES = lambda secret, e: aes.decryptData(secret, base64.b64decode(e))
  41
  42 def pw_encode(s, password):
  43     if password:
  44         secret = Hash(password)
  45         return EncodeAES(secret, s)
  46     else:
  47         return s
  48
  49 def pw_decode(s, password):
  50     if password is not None:
  51         secret = Hash(password)
  52         try:
  53             d = DecodeAES(secret, s)
  54         except:
  55             raise BaseException('Invalid password')
  56         return d
  57     else:
  58         return s
  59
  60
  61
  62
  63
  64 from version import ELECTRUM_VERSION, SEED_VERSION
  65
  66
  67 class WalletStorage:
  68
  69     def __init__(self, config):
  70         self.data = {}
  71         self.file_exists = False
  72         self.init_path(config)
  73         print_error( "wallet path", self.path )
  74         if self.path:
  75             self.read(self.path)
  76
  77
  78     def init_path(self, config):
  79         """Set the path of the wallet."""
  80
  81         path = config.get('wallet_path')
  82         if not path:
  83             path = config.get('default_wallet_path')
  84         if path is not None:
  85             self.path = path
  86             return
  87
  88         self.path = os.path.join(config.path, "electrum.dat")
  89
  90
  91     def read(self, path):
  92         """Read the contents of the wallet file."""
  93         try:
  94             with open(self.path, "r") as f:
  95                 data = f.read()
  96         except IOError:
  97             return
  98         try:
  99             d = ast.literal_eval( data )  #parse raw data from reading wallet file
 100         except:
 101             raise IOError("Cannot read wallet file.")
 102
 103         self.data = d
 104         self.file_exists = True
 105
 106
 107     def get(self, key, default=None):
 108         return self.data.get(key, default)
 109
 110     def put(self, key, value, save = True):
 111
 112         if self.data.get(key) is not None:
 113             self.data[key] = value
 114         else:
 115             # add key to wallet config
 116             self.data[key] = value
 117
 118         if save:
 119             self.write()
 120
 121
 122     def write(self):
 123         s = repr(self.data)
 124         f = open(self.path,"w")
 125         f.write( s )
 126         f.close()
 127         if self.get('gui') != 'android':
 128             import stat
 129             os.chmod(self.path,stat.S_IREAD | stat.S_IWRITE)
 130
 131
 132 class Wallet:
 133
 134     def __init__(self, storage):
 135
 136         self.storage = storage
 137         self.electrum_version = ELECTRUM_VERSION
 138         self.gap_limit_for_change = 3 # constant
 139
 140         # saved fields
 141         self.seed_version          = storage.get('seed_version', SEED_VERSION)
 142
 143         self.gap_limit             = storage.get('gap_limit', 5)
 144         self.use_change            = storage.get('use_change',True)
 145         self.use_encryption        = storage.get('use_encryption', False)
 146         self.seed                  = storage.get('seed', '')               # encrypted
 147         self.labels                = storage.get('labels', {})
 148         self.frozen_addresses      = storage.get('frozen_addresses',[])
 149         self.prioritized_addresses = storage.get('prioritized_addresses',[])
 150         self.addressbook           = storage.get('contacts', [])
 151
 152         self.imported_keys         = storage.get('imported_keys',{})
 153         self.history               = storage.get('addr_history',{})        # address -> list(txid, height)
 154
 155         self.fee                   = int(storage.get('fee_per_kb',20000))
 156
 157         self.master_public_keys = storage.get('master_public_keys',{})
 158         self.master_private_keys = storage.get('master_private_keys', {})
 159
 160         self.next_addresses = storage.get('next_addresses',{})
 161
 162         if self.seed_version < 4:
 163             raise ValueError("This wallet seed is deprecated.")
 164
 165         self.load_accounts()
 166
 167         self.transactions = {}
 168         tx_list = self.storage.get('transactions',{})
 169         for k,v in tx_list.items():
 170             try:
 171                 tx = Transaction(v)
 172             except:
 173                 print_msg("Warning: Cannot deserialize transactions. skipping")
 174                 continue
 175
 176             self.add_extra_addresses(tx)
 177             self.transactions[k] = tx
 178
 179         for h,tx in self.transactions.items():
 180             if not self.check_new_tx(h, tx):
 181                 print_error("removing unreferenced tx", h)
 182                 self.transactions.pop(h)
 183
 184
 185         # not saved
 186         self.prevout_values = {}     # my own transaction outputs
 187         self.spent_outputs = []
 188
 189         # spv
 190         self.verifier = None
 191
 192         # there is a difference between wallet.up_to_date and interface.is_up_to_date()
 193         # interface.is_up_to_date() returns true when all requests have been answered and processed
 194         # wallet.up_to_date is true when the wallet is synchronized (stronger requirement)
 195
 196         self.up_to_date = False
 197         self.lock = threading.Lock()
 198         self.transaction_lock = threading.Lock()
 199         self.tx_event = threading.Event()
 200
 201         for tx_hash, tx in self.transactions.items():
 202             self.update_tx_outputs(tx_hash)
 203
 204
 205     def add_extra_addresses(self, tx):
 206         h = tx.hash()
 207         # find the address corresponding to pay-to-pubkey inputs
 208         tx.add_extra_addresses(self.transactions)
 209         for o in tx.d.get('outputs'):
 210             if o.get('is_pubkey'):
 211                 for tx2 in self.transactions.values():
 212                     tx2.add_extra_addresses({h:tx})
 213
 214
 215
 216
 217     def set_up_to_date(self,b):
 218         with self.lock: self.up_to_date = b
 219
 220
 221     def is_up_to_date(self):
 222         with self.lock: return self.up_to_date
 223
 224
 225     def update(self):
 226         self.up_to_date = False
 227         while not self.is_up_to_date():
 228             time.sleep(0.1)
 229
 230
 231     def import_key(self, sec, password):
 232         # check password
 233         seed = self.decode_seed(password)
 234         try:
 235             address = address_from_private_key(sec)
 236         except:
 237             raise BaseException('Invalid private key')
 238
 239         if self.is_mine(address):
 240             raise BaseException('Address already in wallet')
 241
 242         # store the originally requested keypair into the imported keys table
 243         self.imported_keys[address] = pw_encode(sec, password )
 244         self.storage.put('imported_keys', self.imported_keys, True)
 245         if self.synchronizer:
 246             self.synchronizer.subscribe_to_addresses([address])
 247         return address
 248
 249     def delete_imported_key(self, addr):
 250         if addr in self.imported_keys:
 251             self.imported_keys.pop(addr)
 252             self.storage.put('imported_keys', self.imported_keys, True)
 253
 254
 255     def init_seed(self, seed):
 256         if self.seed: raise BaseException("a seed exists")
 257         if not seed:
 258             seed = random_seed(128)
 259         self.seed = seed
 260
 261
 262     def save_seed(self):
 263         self.storage.put('seed', self.seed, True)
 264         self.storage.put('seed_version', self.seed_version, True)
 265
 266     def create_watching_only_wallet(self, c0, K0):
 267         cK0 = ""
 268         self.master_public_keys = {
 269             "m/0'/": (c0, K0, cK0),
 270             }
 271         self.storage.put('master_public_keys', self.master_public_keys, True)
 272         self.create_account('1','Main account')
 273
 274     def create_accounts(self):
 275
 276         master_k, master_c, master_K, master_cK = bip32_init(self.seed)
 277
 278         # normal accounts
 279         k0, c0, K0, cK0 = bip32_private_derivation(master_k, master_c, "m/", "m/0'/")
 280         # p2sh 2of2
 281         k1, c1, K1, cK1 = bip32_private_derivation(master_k, master_c, "m/", "m/1'/")
 282         k2, c2, K2, cK2 = bip32_private_derivation(master_k, master_c, "m/", "m/2'/")
 283         # p2sh 2of3
 284         k3, c3, K3, cK3 = bip32_private_derivation(master_k, master_c, "m/", "m/3'/")
 285         k4, c4, K4, cK4 = bip32_private_derivation(master_k, master_c, "m/", "m/4'/")
 286         k5, c5, K5, cK5 = bip32_private_derivation(master_k, master_c, "m/", "m/5'/")
 287
 288         self.master_public_keys = {
 289             "m/0'/": (c0, K0, cK0),
 290             "m/1'/": (c1, K1, cK1),
 291             "m/2'/": (c2, K2, cK2),
 292             "m/3'/": (c3, K3, cK3),
 293             "m/4'/": (c4, K4, cK4),
 294             "m/5'/": (c5, K5, cK5)
 295             }
 296
 297         self.master_private_keys = {
 298             "m/0'/": k0,
 299             "m/1'/": k1,
 300             "m/2'/": k2,
 301             "m/3'/": k3,
 302             "m/4'/": k4,
 303             "m/5'/": k5
 304             }
 305
 306         self.storage.put('master_public_keys', self.master_public_keys, True)
 307         self.storage.put('master_private_keys', self.master_private_keys, True)
 308
 309         # create default account
 310         self.create_account('1','Main account')
 311
 312
 313     def find_root_by_master_key(self, c, K):
 314         for key, v in self.master_public_keys.items():
 315             if key == "m/":continue
 316             cc, KK, _ = v
 317             if (c == cc) and (K == KK):
 318                 return key
 319
 320     def deseed_root(self, seed, password):
 321         # for safety, we ask the user to enter their seed
 322         assert seed == self.decode_seed(password)
 323         self.seed = ''
 324         self.storage.put('seed', '', True)
 325
 326
 327     def deseed_branch(self, k):
 328         # check that parent has no seed
 329         assert self.seed == ''
 330         self.master_private_keys.pop(k)
 331         self.storage.put('master_private_keys', self.master_private_keys, True)
 332
 333
 334     def account_id(self, account_type, i):
 335         if account_type == '1':
 336             return "m/0'/%d"%i
 337         elif account_type == '2of2':
 338             return "m/1'/%d & m/2'/%d"%(i,i)
 339         elif account_type == '2of3':
 340             return "m/3'/%d & m/4'/%d & m/5'/%d"%(i,i,i)
 341         else:
 342             raise BaseException('unknown account type')
 343
 344
 345     def num_accounts(self, account_type):
 346         keys = self.accounts.keys()
 347         i = 0
 348         while True:
 349             account_id = self.account_id(account_type, i)
 350             if account_id not in keys: break
 351             i += 1
 352         return i
 353
 354
 355     def new_account_address(self, account_type = '1'):
 356         i = self.num_accounts(account_type)
 357         k = self.account_id(account_type,i)
 358
 359         addr = self.next_addresses.get(k)
 360         if not addr:
 361             account_id, account = self.next_account(account_type)
 362             addr = account.first_address()
 363             self.next_addresses[k] = addr
 364             self.storage.put('next_addresses',self.next_addresses)
 365
 366         return addr
 367
 368
 369     def next_account(self, account_type = '1'):
 370
 371         i = self.num_accounts(account_type)
 372         account_id = self.account_id(account_type,i)
 373
 374         if account_type is '1':
 375             master_c0, master_K0, _ = self.master_public_keys["m/0'/"]
 376             c0, K0, cK0 = bip32_public_derivation(master_c0.decode('hex'), master_K0.decode('hex'), "m/0'/", "m/0'/%d"%i)
 377             account = BIP32_Account({ 'c':c0, 'K':K0, 'cK':cK0 })
 378
 379         elif account_type == '2of2':
 380             master_c1, master_K1, _ = self.master_public_keys["m/1'/"]
 381             c1, K1, cK1 = bip32_public_derivation(master_c1.decode('hex'), master_K1.decode('hex'), "m/1'/", "m/1'/%d"%i)
 382             master_c2, master_K2, _ = self.master_public_keys["m/2'/"]
 383             c2, K2, cK2 = bip32_public_derivation(master_c2.decode('hex'), master_K2.decode('hex'), "m/2'/", "m/2'/%d"%i)
 384             account = BIP32_Account_2of2({ 'c':c1, 'K':K1, 'cK':cK1, 'c2':c2, 'K2':K2, 'cK2':cK2 })
 385
 386         elif account_type == '2of3':
 387             master_c3, master_K3, _ = self.master_public_keys["m/3'/"]
 388             c3, K3, cK3 = bip32_public_derivation(master_c3.decode('hex'), master_K3.decode('hex'), "m/3'/", "m/3'/%d"%i)
 389             master_c4, master_K4, _ = self.master_public_keys["m/4'/"]
 390             c4, K4, cK4 = bip32_public_derivation(master_c4.decode('hex'), master_K4.decode('hex'), "m/4'/", "m/4'/%d"%i)
 391             master_c5, master_K5, _ = self.master_public_keys["m/5'/"]
 392             c5, K5, cK5 = bip32_public_derivation(master_c5.decode('hex'), master_K5.decode('hex'), "m/5'/", "m/5'/%d"%i)
 393             account = BIP32_Account_2of3({ 'c':c3, 'K':K3, 'cK':cK3, 'c2':c4, 'K2':K4, 'cK2':cK4, 'c3':c5, 'K3':K5, 'cK3':cK5 })
 394
 395         return account_id, account
 396
 397
 398     def set_label(self, key, value):
 399         self.labels[key] = value
 400         self.storage.put('labels', self.labels, True)
 401
 402
 403     def create_account(self, account_type = '1', name = None):
 404         account_id, account = self.next_account(account_type)
 405         self.accounts[account_id] = account
 406         self.save_accounts()
 407         if name:
 408             self.set_label(account_id, name)
 409
 410
 411     def create_old_account(self):
 412         mpk = OldAccount.mpk_from_seed(self.seed)
 413         self.storage.put('master_public_key', mpk, True)
 414         self.accounts[0] = OldAccount({'mpk':mpk, 0:[], 1:[]})
 415         self.save_accounts()
 416
 417
 418     def save_accounts(self):
 419         d = {}
 420         for k, v in self.accounts.items():
 421             d[k] = v.dump()
 422         self.storage.put('accounts', d, True)
 423
 424
 425
 426     def load_accounts(self):
 427         d = self.storage.get('accounts', {})
 428         self.accounts = {}
 429         for k, v in d.items():
 430             if k == 0:
 431                 v['mpk'] = self.storage.get('master_public_key')
 432                 self.accounts[k] = OldAccount(v)
 433             elif '&' in k:
 434                 self.accounts[k] = BIP32_Account_2of2(v)
 435             else:
 436                 self.accounts[k] = BIP32_Account(v)
 437
 438
 439     def addresses(self, include_change = True, next=False):
 440         o = self.get_account_addresses(-1, include_change)
 441         for a in self.accounts.keys():
 442             o += self.get_account_addresses(a, include_change)
 443
 444         if next:
 445             for addr in self.next_addresses.values():
 446                 if addr not in o:
 447                     o += [addr]
 448         return o
 449
 450
 451     def is_mine(self, address):
 452         return address in self.addresses(True)
 453
 454
 455     def is_change(self, address):
 456         if not self.is_mine(address): return False
 457         if address in self.imported_keys.keys(): return False
 458         acct, s = self.get_address_index(address)
 459         if s is None: return False
 460         return s[0] == 1
 461
 462     def get_master_public_key(self):
 463         if self.seed_version == 4:
 464             return self.storage.get("master_public_key")
 465         else:
 466             c, K, cK = self.storage.get("master_public_keys")["m/0'/"]
 467             return repr((c, K))
 468
 469     def get_master_private_key(self, account, password):
 470         master_k = pw_decode( self.master_private_keys[account], password)
 471         master_c, master_K, master_Kc = self.master_public_keys[account]
 472         try:
 473             K, Kc = get_pubkeys_from_secret(master_k.decode('hex'))
 474             assert K.encode('hex') == master_K
 475         except:
 476             raise BaseException("Invalid password")
 477         return master_k
 478
 479
 480     def get_address_index(self, address):
 481         if address in self.imported_keys.keys():
 482             return -1, None
 483
 484         for account in self.accounts.keys():
 485             for for_change in [0,1]:
 486                 addresses = self.accounts[account].get_addresses(for_change)
 487                 for addr in addresses:
 488                     if address == addr:
 489                         return account, (for_change, addresses.index(addr))
 490
 491         raise BaseException("Address not found", address)
 492
 493
 494     def rebase_sequence(self, account, sequence):
 495         c, i = sequence
 496         dd = []
 497         for a in account.split('&'):
 498             s = a.strip()
 499             m = re.match("(m/\d+'/)(\d+)", s)
 500             root = m.group(1)
 501             num = int(m.group(2))
 502             dd.append( (root, [num,c,i] ) )
 503         return dd
 504
 505
 506     def get_keyID(self, account, sequence):
 507         if account == 0:
 508             return 'old'
 509
 510         rs = self.rebase_sequence(account, sequence)
 511         dd = []
 512         for root, public_sequence in rs:
 513             c, K, _ = self.master_public_keys[root]
 514             s = '/' + '/'.join( map(lambda x:str(x), public_sequence) )
 515             dd.append( 'bip32(%s,%s,%s)'%(c,K, s) )
 516         return '&'.join(dd)
 517
 518
 519     def get_public_key(self, address):
 520         account, sequence = self.get_address_index(address)
 521         return self.accounts[account].get_pubkey( *sequence )
 522
 523
 524     def decode_seed(self, password):
 525         seed = pw_decode(self.seed, password)
 526         #todo:  #self.sequences[0].check_seed(seed)
 527         return seed
 528
 529
 530     def get_private_key(self, address, password):
 531         out = []
 532         if address in self.imported_keys.keys():
 533             out.append( pw_decode( self.imported_keys[address], password ) )
 534         else:
 535             account, sequence = self.get_address_index(address)
 536             if account == 0:
 537                 seed = self.decode_seed(password)
 538                 pk = self.accounts[account].get_private_key(seed, sequence)
 539                 out.append(pk)
 540                 return out
 541
 542             # assert address == self.accounts[account].get_address(*sequence)
 543             rs = self.rebase_sequence( account, sequence)
 544             for root, public_sequence in rs:
 545
 546                 if root not in self.master_private_keys.keys(): continue
 547                 master_k = self.get_master_private_key(root, password)
 548                 master_c, _, _ = self.master_public_keys[root]
 549                 pk = bip32_private_key( public_sequence, master_k.decode('hex'), master_c.decode('hex'))
 550                 out.append(pk)
 551
 552         return out
 553
 554
 555
 556
 557     def signrawtransaction(self, tx, input_info, private_keys, password):
 558
 559         unspent_coins = self.get_unspent_coins()
 560         seed = self.decode_seed(password)
 561
 562         # build a list of public/private keys
 563         keypairs = {}
 564         for sec in private_keys:
 565             pubkey = public_key_from_private_key(sec)
 566             keypairs[ pubkey ] = sec
 567
 568
 569         for txin in tx.inputs:
 570             # convert to own format
 571             txin['tx_hash'] = txin['prevout_hash']
 572             txin['index'] = txin['prevout_n']
 573
 574             for item in input_info:
 575                 if item.get('txid') == txin['tx_hash'] and item.get('vout') == txin['index']:
 576                     txin['raw_output_script'] = item['scriptPubKey']
 577                     txin['redeemScript'] = item.get('redeemScript')
 578                     txin['KeyID'] = item.get('KeyID')
 579                     break
 580             else:
 581                 for item in unspent_coins:
 582                     if txin['tx_hash'] == item['tx_hash'] and txin['index'] == item['index']:
 583                         print_error( "tx input is in unspent coins" )
 584                         txin['raw_output_script'] = item['raw_output_script']
 585                         account, sequence = self.get_address_index(item['address'])
 586                         if account != -1:
 587                             txin['redeemScript'] = self.accounts[account].redeem_script(sequence)
 588                         break
 589                 else:
 590                     raise BaseException("Unknown transaction input. Please provide the 'input_info' parameter, or synchronize this wallet")
 591
 592             # if available, derive private_keys from KeyID
 593             keyid = txin.get('KeyID')
 594             if keyid:
 595                 roots = []
 596                 for s in keyid.split('&'):
 597                     m = re.match("bip32\(([0-9a-f]+),([0-9a-f]+),(/\d+/\d+/\d+)", s)
 598                     if not m: continue
 599                     c = m.group(1)
 600                     K = m.group(2)
 601                     sequence = m.group(3)
 602                     root = self.find_root_by_master_key(c,K)
 603                     if not root: continue
 604                     sequence = map(lambda x:int(x), sequence.strip('/').split('/'))
 605                     root = root + '%d'%sequence[0]
 606                     sequence = sequence[1:]
 607                     roots.append((root,sequence))
 608
 609                 account_id = " & ".join( map(lambda x:x[0], roots) )
 610                 account = self.accounts.get(account_id)
 611                 if not account: continue
 612                 addr = account.get_address(*sequence)
 613                 txin['address'] = addr
 614                 pk = self.get_private_key(addr, password)
 615                 for sec in pk:
 616                     pubkey = public_key_from_private_key(sec)
 617                     keypairs[pubkey] = sec
 618
 619             redeem_script = txin.get("redeemScript")
 620             print_error( "p2sh:", "yes" if redeem_script else "no")
 621             if redeem_script:
 622                 addr = hash_160_to_bc_address(hash_160(redeem_script.decode('hex')), 5)
 623             else:
 624                 import transaction
 625                 _, addr = transaction.get_address_from_output_script(txin["raw_output_script"].decode('hex'))
 626             txin['address'] = addr
 627
 628             # add private keys that are in the wallet
 629             pk = self.get_private_key(addr, password)
 630             for sec in pk:
 631                 pubkey = public_key_from_private_key(sec)
 632                 keypairs[pubkey] = sec
 633                 if not redeem_script:
 634                     txin['redeemPubkey'] = pubkey
 635
 636             print txin
 637
 638         tx.sign( keypairs )
 639
 640     def sign_message(self, address, message, password):
 641         keys = self.get_private_key(address, password)
 642         assert len(keys) == 1
 643         sec = keys[0]
 644         key = regenerate_key(sec)
 645         compressed = is_compressed(sec)
 646         return key.sign_message(message, compressed, address)
 647
 648     def verify_message(self, address, signature, message):
 649         try:
 650             EC_KEY.verify_message(address, signature, message)
 651             return True
 652         except BaseException as e:
 653             print_error("Verification error: {0}".format(e))
 654             return False
 655
 656
 657     def change_gap_limit(self, value):
 658         if value >= self.gap_limit:
 659             self.gap_limit = value
 660             self.storage.put('gap_limit', self.gap_limit, True)
 661             #self.interface.poke('synchronizer')
 662             return True
 663
 664         elif value >= self.min_acceptable_gap():
 665             for key, account in self.accounts.items():
 666                 addresses = account[0]
 667                 k = self.num_unused_trailing_addresses(addresses)
 668                 n = len(addresses) - k + value
 669                 addresses = addresses[0:n]
 670                 self.accounts[key][0] = addresses
 671
 672             self.gap_limit = value
 673             self.storage.put('gap_limit', self.gap_limit, True)
 674             self.save_accounts()
 675             return True
 676         else:
 677             return False
 678
 679     def num_unused_trailing_addresses(self, addresses):
 680         k = 0
 681         for a in addresses[::-1]:
 682             if self.history.get(a):break
 683             k = k + 1
 684         return k
 685
 686     def min_acceptable_gap(self):
 687         # fixme: this assumes wallet is synchronized
 688         n = 0
 689         nmax = 0
 690
 691         for account in self.accounts.values():
 692             addresses = account.get_addresses(0)
 693             k = self.num_unused_trailing_addresses(addresses)
 694             for a in addresses[0:-k]:
 695                 if self.history.get(a):
 696                     n = 0
 697                 else:
 698                     n += 1
 699                     if n > nmax: nmax = n
 700         return nmax + 1
 701
 702
 703     def address_is_old(self, address):
 704         age = -1
 705         h = self.history.get(address, [])
 706         if h == ['*']:
 707             return True
 708         for tx_hash, tx_height in h:
 709             if tx_height == 0:
 710                 tx_age = 0
 711             else:
 712                 tx_age = self.verifier.blockchain.height - tx_height + 1
 713             if tx_age > age:
 714                 age = tx_age
 715         return age > 2
 716
 717
 718     def synchronize_sequence(self, account, for_change):
 719         limit = self.gap_limit_for_change if for_change else self.gap_limit
 720         new_addresses = []
 721         while True:
 722             addresses = account.get_addresses(for_change)
 723             if len(addresses) < limit:
 724                 address = account.create_new_address(for_change)
 725                 self.history[address] = []
 726                 new_addresses.append( address )
 727                 continue
 728
 729             if map( lambda a: self.address_is_old(a), addresses[-limit:] ) == limit*[False]:
 730                 break
 731             else:
 732                 address = account.create_new_address(for_change)
 733                 self.history[address] = []
 734                 new_addresses.append( address )
 735
 736         return new_addresses
 737
 738
 739
 740     def create_pending_accounts(self):
 741         for account_type in ['1','2of2','2of3']:
 742             a = self.new_account_address(account_type)
 743             if self.address_is_old(a):
 744                 print_error( "creating account", a )
 745                 self.create_account(account_type)
 746
 747
 748     def synchronize_account(self, account):
 749         new = []
 750         new += self.synchronize_sequence(account, 0)
 751         new += self.synchronize_sequence(account, 1)
 752         return new
 753
 754
 755     def synchronize(self):
 756         if self.master_public_keys:
 757             self.create_pending_accounts()
 758         new = []
 759         for account in self.accounts.values():
 760             new += self.synchronize_account(account)
 761         if new:
 762             self.save_accounts()
 763             self.storage.put('addr_history', self.history, True)
 764         return new
 765
 766
 767     def is_found(self):
 768         return self.history.values() != [[]] * len(self.history)
 769
 770
 771     def add_contact(self, address, label=None):
 772         self.addressbook.append(address)
 773         self.storage.put('contacts', self.addressbook, True)
 774         if label:
 775             self.set_label(address, label)
 776
 777
 778     def delete_contact(self, addr):
 779         if addr in self.addressbook:
 780             self.addressbook.remove(addr)
 781             self.storage.put('addressbook', self.addressbook, True)
 782
 783
 784     def fill_addressbook(self):
 785         for tx_hash, tx in self.transactions.items():
 786             is_relevant, is_send, _, _ = self.get_tx_value(tx)
 787             if is_send:
 788                 for addr, v in tx.outputs:
 789                     if not self.is_mine(addr) and addr not in self.addressbook:
 790                         self.addressbook.append(addr)
 791         # redo labels
 792         # self.update_tx_labels()
 793
 794     def get_num_tx(self, address):
 795         n = 0
 796         for tx in self.transactions.values():
 797             if address in map(lambda x:x[0], tx.outputs): n += 1
 798         return n
 799
 800
 801     def get_address_flags(self, addr):
 802         flags = "C" if self.is_change(addr) else "I" if addr in self.imported_keys.keys() else "-"
 803         flags += "F" if addr in self.frozen_addresses else "P" if addr in self.prioritized_addresses else "-"
 804         return flags
 805
 806
 807     def get_tx_value(self, tx, account=None):
 808         domain = self.get_account_addresses(account)
 809         return tx.get_value(domain, self.prevout_values)
 810
 811
 812     def update_tx_outputs(self, tx_hash):
 813         tx = self.transactions.get(tx_hash)
 814
 815         for i, (addr, value) in enumerate(tx.outputs):
 816             key = tx_hash+ ':%d'%i
 817             self.prevout_values[key] = value
 818
 819         for item in tx.inputs:
 820             if self.is_mine(item.get('address')):
 821                 key = item['prevout_hash'] + ':%d'%item['prevout_n']
 822                 self.spent_outputs.append(key)
 823
 824
 825     def get_addr_balance(self, address):
 826         assert self.is_mine(address)
 827         h = self.history.get(address,[])
 828         if h == ['*']: return 0,0
 829         c = u = 0
 830         received_coins = []   # list of coins received at address
 831
 832         for tx_hash, tx_height in h:
 833             tx = self.transactions.get(tx_hash)
 834             if not tx: continue
 835
 836             for i, (addr, value) in enumerate(tx.outputs):
 837                 if addr == address:
 838                     key = tx_hash + ':%d'%i
 839                     received_coins.append(key)
 840
 841         for tx_hash, tx_height in h:
 842             tx = self.transactions.get(tx_hash)
 843             if not tx: continue
 844             v = 0
 845
 846             for item in tx.inputs:
 847                 addr = item.get('address')
 848                 if addr == address:
 849                     key = item['prevout_hash']  + ':%d'%item['prevout_n']
 850                     value = self.prevout_values.get( key )
 851                     if key in received_coins:
 852                         v -= value
 853
 854             for i, (addr, value) in enumerate(tx.outputs):
 855                 key = tx_hash + ':%d'%i
 856                 if addr == address:
 857                     v += value
 858
 859             if tx_height:
 860                 c += v
 861             else:
 862                 u += v
 863         return c, u
 864
 865
 866     def get_account_name(self, k):
 867         if k == 0:
 868             if self.seed_version == 4:
 869                 name = 'Main account'
 870             else:
 871                 name = 'Old account'
 872         else:
 873             name = self.labels.get(k, 'Unnamed account')
 874         return name
 875
 876     def get_account_names(self):
 877         accounts = {}
 878         for k, account in self.accounts.items():
 879             accounts[k] = self.get_account_name(k)
 880         if self.imported_keys:
 881             accounts[-1] = 'Imported keys'
 882         return accounts
 883
 884     def get_account_addresses(self, a, include_change=True):
 885         if a is None:
 886             o = self.addresses(True)
 887         elif a == -1:
 888             o = self.imported_keys.keys()
 889         else:
 890             ac = self.accounts[a]
 891             o = ac.get_addresses(0)
 892             if include_change: o += ac.get_addresses(1)
 893         return o
 894
 895     def get_imported_balance(self):
 896         cc = uu = 0
 897         for addr in self.imported_keys.keys():
 898             c, u = self.get_addr_balance(addr)
 899             cc += c
 900             uu += u
 901         return cc, uu
 902
 903     def get_account_balance(self, account):
 904         if account is None:
 905             return self.get_balance()
 906         elif account == -1:
 907             return self.get_imported_balance()
 908
 909         conf = unconf = 0
 910         for addr in self.get_account_addresses(account):
 911             c, u = self.get_addr_balance(addr)
 912             conf += c
 913             unconf += u
 914         return conf, unconf
 915
 916     def get_frozen_balance(self):
 917         conf = unconf = 0
 918         for addr in self.frozen_addresses:
 919             c, u = self.get_addr_balance(addr)
 920             conf += c
 921             unconf += u
 922         return conf, unconf
 923
 924
 925     def get_balance(self):
 926         cc = uu = 0
 927         for a in self.accounts.keys():
 928             c, u = self.get_account_balance(a)
 929             cc += c
 930             uu += u
 931         c, u = self.get_imported_balance()
 932         cc += c
 933         uu += u
 934         return cc, uu
 935
 936
 937     def get_unspent_coins(self, domain=None):
 938         coins = []
 939         if domain is None: domain = self.addresses(True)
 940         for addr in domain:
 941             h = self.history.get(addr, [])
 942             if h == ['*']: continue
 943             for tx_hash, tx_height in h:
 944                 tx = self.transactions.get(tx_hash)
 945                 if tx is None: raise BaseException("Wallet not synchronized")
 946                 for output in tx.d.get('outputs'):
 947                     if output.get('address') != addr: continue
 948                     key = tx_hash + ":%d" % output.get('index')
 949                     if key in self.spent_outputs: continue
 950                     output['tx_hash'] = tx_hash
 951                     coins.append(output)
 952         return coins
 953
 954
 955
 956     def choose_tx_inputs( self, amount, fixed_fee, domain = None ):
 957         """ todo: minimize tx size """
 958         total = 0
 959         fee = self.fee if fixed_fee is None else fixed_fee
 960         if domain is None:
 961             domain = self.addresses()
 962
 963         for i in self.frozen_addresses:
 964             if i in domain: domain.remove(i)
 965
 966         prioritized = []
 967         for i in self.prioritized_addresses:
 968             if i in domain:
 969                 domain.remove(i)
 970                 prioritized.append(i)
 971
 972         coins = self.get_unspent_coins(domain)
 973         prioritized_coins = self.get_unspent_coins(prioritized)
 974
 975         inputs = []
 976         coins = prioritized_coins + coins
 977
 978         for item in coins:
 979             addr = item.get('address')
 980             v = item.get('value')
 981             total += v
 982             inputs.append( item )
 983             fee = self.estimated_fee(inputs) if fixed_fee is None else fixed_fee
 984             if total >= amount + fee: break
 985         else:
 986             inputs = []
 987
 988         return inputs, total, fee
 989
 990
 991     def set_fee(self, fee):
 992         if self.fee != fee:
 993             self.fee = fee
 994             self.storage.put('fee_per_kb', self.fee, True)
 995
 996     def estimated_fee(self, inputs):
 997         estimated_size =  len(inputs) * 180 + 80     # this assumes non-compressed keys
 998         fee = self.fee * int(round(estimated_size/1024.))
 999         if fee == 0: fee = self.fee
1000         return fee
1001
1002
1003     def add_tx_change( self, inputs, outputs, amount, fee, total, change_addr=None):
1004         "add change to a transaction"
1005         change_amount = total - ( amount + fee )
1006         if change_amount != 0:
1007             if not change_addr:
1008
1009                 # send change to one of the accounts involved in the tx
1010                 address = inputs[0].get('address')
1011                 account, _ = self.get_address_index(address)
1012
1013                 if not self.use_change or account == -1:
1014                     change_addr = inputs[-1]['address']
1015                 else:
1016                     change_addr = self.accounts[account].get_addresses(1)[-self.gap_limit_for_change]
1017
1018             # Insert the change output at a random position in the outputs
1019             posn = random.randint(0, len(outputs))
1020             outputs[posn:posn] = [( change_addr,  change_amount)]
1021         return outputs
1022
1023
1024     def get_history(self, address):
1025         with self.lock:
1026             return self.history.get(address)
1027
1028
1029     def get_status(self, h):
1030         if not h: return None
1031         if h == ['*']: return '*'
1032         status = ''
1033         for tx_hash, height in h:
1034             status += tx_hash + ':%d:' % height
1035         return hashlib.sha256( status ).digest().encode('hex')
1036
1037
1038     def receive_tx_callback(self, tx_hash, tx, tx_height):
1039
1040         with self.transaction_lock:
1041             self.add_extra_addresses(tx)
1042             if not self.check_new_tx(tx_hash, tx):
1043                 # may happen due to pruning
1044                 print_error("received transaction that is no longer referenced in history", tx_hash)
1045                 return
1046             self.transactions[tx_hash] = tx
1047             self.network.interface.pending_transactions_for_notifications.append(tx)
1048             self.save_transactions()
1049             if self.verifier and tx_height>0:
1050                 self.verifier.add(tx_hash, tx_height)
1051             self.update_tx_outputs(tx_hash)
1052
1053
1054     def save_transactions(self):
1055         tx = {}
1056         for k,v in self.transactions.items():
1057             tx[k] = str(v)
1058         self.storage.put('transactions', tx, True)
1059
1060     def receive_history_callback(self, addr, hist):
1061
1062         if not self.check_new_history(addr, hist):
1063             raise BaseException("error: received history for %s is not consistent with known transactions"%addr)
1064
1065         with self.lock:
1066             self.history[addr] = hist
1067             self.storage.put('addr_history', self.history, True)
1068
1069         if hist != ['*']:
1070             for tx_hash, tx_height in hist:
1071                 if tx_height>0:
1072                     # add it in case it was previously unconfirmed
1073                     if self.verifier: self.verifier.add(tx_hash, tx_height)
1074
1075
1076     def get_tx_history(self, account=None):
1077         with self.transaction_lock:
1078             history = self.transactions.items()
1079             history.sort(key = lambda x: self.verifier.get_txpos(x[0]))
1080             result = []
1081
1082             balance = 0
1083             for tx_hash, tx in history:
1084                 is_relevant, is_mine, v, fee = self.get_tx_value(tx, account)
1085                 if v is not None: balance += v
1086
1087             c, u = self.get_account_balance(account)
1088
1089             if balance != c+u:
1090                 result.append( ('', 1000, 0, c+u-balance, None, c+u-balance, None ) )
1091
1092             balance = c + u - balance
1093             for tx_hash, tx in history:
1094                 is_relevant, is_mine, value, fee = self.get_tx_value(tx, account)
1095                 if not is_relevant:
1096                     continue
1097                 if value is not None:
1098                     balance += value
1099
1100                 conf, timestamp = self.verifier.get_confirmations(tx_hash) if self.verifier else (None, None)
1101                 result.append( (tx_hash, conf, is_mine, value, fee, balance, timestamp) )
1102
1103         return result
1104
1105
1106     def get_label(self, tx_hash):
1107         label = self.labels.get(tx_hash)
1108         is_default = (label == '') or (label is None)
1109         if is_default: label = self.get_default_label(tx_hash)
1110         return label, is_default
1111
1112
1113     def get_default_label(self, tx_hash):
1114         tx = self.transactions.get(tx_hash)
1115         default_label = ''
1116         if tx:
1117             is_relevant, is_mine, _, _ = self.get_tx_value(tx)
1118             if is_mine:
1119                 for o in tx.outputs:
1120                     o_addr, _ = o
1121                     if not self.is_mine(o_addr):
1122                         try:
1123                             default_label = self.labels[o_addr]
1124                         except KeyError:
1125                             default_label = o_addr
1126                         break
1127                 else:
1128                     default_label = '(internal)'
1129             else:
1130                 for o in tx.outputs:
1131                     o_addr, _ = o
1132                     if self.is_mine(o_addr) and not self.is_change(o_addr):
1133                         break
1134                 else:
1135                     for o in tx.outputs:
1136                         o_addr, _ = o
1137                         if self.is_mine(o_addr):
1138                             break
1139                     else:
1140                         o_addr = None
1141
1142                 if o_addr:
1143                     dest_label = self.labels.get(o_addr)
1144                     try:
1145                         default_label = self.labels[o_addr]
1146                     except KeyError:
1147                         default_label = o_addr
1148
1149         return default_label
1150
1151
1152     def make_unsigned_transaction(self, outputs, fee=None, change_addr=None, domain=None ):
1153         for address, x in outputs:
1154             assert is_valid(address)
1155         amount = sum( map(lambda x:x[1], outputs) )
1156         inputs, total, fee = self.choose_tx_inputs( amount, fee, domain )
1157         if not inputs:
1158             raise ValueError("Not enough funds")
1159         outputs = self.add_tx_change(inputs, outputs, amount, fee, total, change_addr)
1160         return Transaction.from_io(inputs, outputs)
1161
1162
1163     def mktx_from_account(self, outputs, password, fee=None, change_addr=None, account=None):
1164         domain = self.get_account_addresses(account) if account else None
1165         return self.mktx(outputs, password, fee, change_addr, domain)
1166
1167
1168     def mktx(self, outputs, password, fee=None, change_addr=None, domain= None ):
1169         tx = self.make_unsigned_transaction(outputs, fee, change_addr, domain)
1170         self.sign_transaction(tx, password)
1171         return tx
1172
1173
1174     def sign_transaction(self, tx, password):
1175         keypairs = {}
1176         for i, txin in enumerate(tx.inputs):
1177             address = txin['address']
1178             account, sequence = self.get_address_index(address)
1179             txin['KeyID'] = self.get_keyID(account, sequence)
1180             redeemScript = self.accounts[account].redeem_script(sequence)
1181             if redeemScript:
1182                 txin['redeemScript'] = redeemScript
1183             else:
1184                 txin['redeemPubkey'] = self.accounts[account].get_pubkey(*sequence)
1185             private_keys = self.get_private_key(address, password)
1186             for sec in private_keys:
1187                 pubkey = public_key_from_private_key(sec)
1188                 keypairs[ pubkey ] = sec
1189         tx.sign(keypairs)
1190
1191
1192     def sendtx(self, tx):
1193         # synchronous
1194         h = self.send_tx(tx)
1195         self.tx_event.wait()
1196         return self.receive_tx(h)
1197
1198     def send_tx(self, tx):
1199         # asynchronous
1200         self.tx_event.clear()
1201         self.network.interface.send([('blockchain.transaction.broadcast', [str(tx)])], self.on_broadcast)
1202         return tx.hash()
1203
1204     def on_broadcast(self, i, r):
1205         self.tx_result = r.get('result')
1206         self.tx_event.set()
1207
1208     def receive_tx(self,tx_hash):
1209         out = self.tx_result
1210         if out != tx_hash:
1211             return False, "error: " + out
1212         return True, out
1213
1214
1215
1216     def update_password(self, seed, old_password, new_password):
1217         if new_password == '': new_password = None
1218         # this will throw an exception if unicode cannot be converted
1219         self.seed = pw_encode( seed, new_password)
1220         self.storage.put('seed', self.seed, True)
1221         self.use_encryption = (new_password != None)
1222         self.storage.put('use_encryption', self.use_encryption,True)
1223         for k in self.imported_keys.keys():
1224             a = self.imported_keys[k]
1225             b = pw_decode(a, old_password)
1226             c = pw_encode(b, new_password)
1227             self.imported_keys[k] = c
1228         self.storage.put('imported_keys', self.imported_keys, True)
1229
1230         for k, v in self.master_private_keys.items():
1231             b = pw_decode(v, old_password)
1232             c = pw_encode(b, new_password)
1233             self.master_private_keys[k] = c
1234         self.storage.put('master_private_keys', self.master_private_keys, True)
1235
1236
1237     def freeze(self,addr):
1238         if self.is_mine(addr) and addr not in self.frozen_addresses:
1239             self.unprioritize(addr)
1240             self.frozen_addresses.append(addr)
1241             self.storage.put('frozen_addresses', self.frozen_addresses, True)
1242             return True
1243         else:
1244             return False
1245
1246     def unfreeze(self,addr):
1247         if self.is_mine(addr) and addr in self.frozen_addresses:
1248             self.frozen_addresses.remove(addr)
1249             self.storage.put('frozen_addresses', self.frozen_addresses, True)
1250             return True
1251         else:
1252             return False
1253
1254     def prioritize(self,addr):
1255         if self.is_mine(addr) and addr not in self.prioritized_addresses:
1256             self.unfreeze(addr)
1257             self.prioritized_addresses.append(addr)
1258             self.storage.put('prioritized_addresses', self.prioritized_addresses, True)
1259             return True
1260         else:
1261             return False
1262
1263     def unprioritize(self,addr):
1264         if self.is_mine(addr) and addr in self.prioritized_addresses:
1265             self.prioritized_addresses.remove(addr)
1266             self.storage.put('prioritized_addresses', self.prioritized_addresses, True)
1267             return True
1268         else:
1269             return False
1270
1271
1272     def set_verifier(self, verifier):
1273         self.verifier = verifier
1274
1275         # review transactions that are in the history
1276         for addr, hist in self.history.items():
1277             if hist == ['*']: continue
1278             for tx_hash, tx_height in hist:
1279                 if tx_height>0:
1280                     # add it in case it was previously unconfirmed
1281                     self.verifier.add(tx_hash, tx_height)
1282
1283
1284         # if we are on a pruning server, remove unverified transactions
1285         vr = self.verifier.transactions.keys() + self.verifier.verified_tx.keys()
1286         for tx_hash in self.transactions.keys():
1287             if tx_hash not in vr:
1288                 self.transactions.pop(tx_hash)
1289
1290
1291
1292     def check_new_history(self, addr, hist):
1293
1294         # check that all tx in hist are relevant
1295         if hist != ['*']:
1296             for tx_hash, height in hist:
1297                 tx = self.transactions.get(tx_hash)
1298                 if not tx: continue
1299                 if not tx.has_address(addr):
1300                     return False
1301
1302         # check that we are not "orphaning" a transaction
1303         old_hist = self.history.get(addr,[])
1304         if old_hist == ['*']: return True
1305
1306         for tx_hash, height in old_hist:
1307             if tx_hash in map(lambda x:x[0], hist): continue
1308             found = False
1309             for _addr, _hist in self.history.items():
1310                 if _addr == addr: continue
1311                 if _hist == ['*']: continue
1312                 _tx_hist = map(lambda x:x[0], _hist)
1313                 if tx_hash in _tx_hist:
1314                     found = True
1315                     break
1316
1317             if not found:
1318                 tx = self.transactions.get(tx_hash)
1319                 # tx might not be there
1320                 if not tx: continue
1321
1322                 # already verified?
1323                 if self.verifier.get_height(tx_hash):
1324                     continue
1325                 # unconfirmed tx
1326                 print_error("new history is orphaning transaction:", tx_hash)
1327                 # check that all outputs are not mine, request histories
1328                 ext_requests = []
1329                 for _addr, _v in tx.outputs:
1330                     # assert not self.is_mine(_addr)
1331                     ext_requests.append( ('blockchain.address.get_history', [_addr]) )
1332
1333                 ext_h = self.network.interface.synchronous_get(ext_requests)
1334                 print_error("sync:", ext_requests, ext_h)
1335                 height = None
1336                 for h in ext_h:
1337                     if h == ['*']: continue
1338                     for item in h:
1339                         if item.get('tx_hash') == tx_hash:
1340                             height = item.get('height')
1341                 if height:
1342                     print_error("found height for", tx_hash, height)
1343                     self.verifier.add(tx_hash, height)
1344                 else:
1345                     print_error("removing orphaned tx from history", tx_hash)
1346                     self.transactions.pop(tx_hash)
1347
1348         return True
1349
1350
1351
1352     def check_new_tx(self, tx_hash, tx):
1353         # 1 check that tx is referenced in addr_history.
1354         addresses = []
1355         for addr, hist in self.history.items():
1356             if hist == ['*']:continue
1357             for txh, height in hist:
1358                 if txh == tx_hash:
1359                     addresses.append(addr)
1360
1361         if not addresses:
1362             return False
1363
1364         # 2 check that referencing addresses are in the tx
1365         for addr in addresses:
1366             if not tx.has_address(addr):
1367                 return False
1368
1369         return True
1370
1371
1372     def start_threads(self, network):
1373         from verifier import TxVerifier
1374         self.network = network
1375         self.verifier = TxVerifier(self.network, self.storage)
1376         self.verifier.start()
1377         self.set_verifier(self.verifier)
1378         self.synchronizer = WalletSynchronizer(self)
1379         self.synchronizer.start()
1380
1381     def stop_threads(self):
1382         self.verifier.stop()
1383         self.synchronizer.stop()
1384
1385
1386
1387
1388
1389 class WalletSynchronizer(threading.Thread):
1390
1391
1392     def __init__(self, wallet):
1393         threading.Thread.__init__(self)
1394         self.daemon = True
1395         self.wallet = wallet
1396         wallet.synchronizer = self
1397         self.network = self.wallet.network
1398         #self.wallet.network.register_callback('connected', lambda: self.wallet.set_up_to_date(False))
1399         self.was_updated = True
1400         self.running = False
1401         self.lock = threading.Lock()
1402         self.queue = Queue.Queue()
1403
1404     def stop(self):
1405         with self.lock: self.running = False
1406
1407     def is_running(self):
1408         with self.lock: return self.running
1409
1410
1411     def subscribe_to_addresses(self, addresses):
1412         messages = []
1413         for addr in addresses:
1414             messages.append(('blockchain.address.subscribe', [addr]))
1415         self.network.interface.send( messages, lambda i,r: self.queue.put(r))
1416
1417
1418     def run(self):
1419         with self.lock:
1420             self.running = True
1421
1422         while self.is_running():
1423             interface = self.network.interface
1424             if not interface.is_connected:
1425                 print_error("synchronizer: waiting for interface")
1426                 interface.connect_event.wait()
1427
1428             self.run_interface(interface)
1429
1430
1431     def run_interface(self, interface):
1432
1433         print_error("synchronizer: connected to", interface.server)
1434
1435         requested_tx = []
1436         missing_tx = []
1437         requested_histories = {}
1438
1439         # request any missing transactions
1440         for history in self.wallet.history.values():
1441             if history == ['*']: continue
1442             for tx_hash, tx_height in history:
1443                 if self.wallet.transactions.get(tx_hash) is None and (tx_hash, tx_height) not in missing_tx:
1444                     missing_tx.append( (tx_hash, tx_height) )
1445
1446         if missing_tx:
1447             print_error("missing tx", missing_tx)
1448
1449         # subscriptions
1450         self.subscribe_to_addresses(self.wallet.addresses(True, next=True))
1451
1452         while self.is_running():
1453             # 1. create new addresses
1454             new_addresses = self.wallet.synchronize()
1455
1456             # request missing addresses
1457             if new_addresses:
1458                 self.subscribe_to_addresses(new_addresses)
1459
1460             # request missing transactions
1461             for tx_hash, tx_height in missing_tx:
1462                 if (tx_hash, tx_height) not in requested_tx:
1463                     interface.send([ ('blockchain.transaction.get',[tx_hash, tx_height]) ], lambda i,r: self.queue.put(r))
1464                     requested_tx.append( (tx_hash, tx_height) )
1465             missing_tx = []
1466
1467             # detect if situation has changed
1468             if interface.is_up_to_date() and self.queue.empty():
1469                 if not self.wallet.is_up_to_date():
1470                     self.wallet.set_up_to_date(True)
1471                     self.was_updated = True
1472             else:
1473                 if self.wallet.is_up_to_date():
1474                     self.wallet.set_up_to_date(False)
1475                     self.was_updated = True
1476
1477             if self.was_updated:
1478                 self.wallet.network.trigger_callback('updated')
1479                 self.was_updated = False
1480
1481             # 2. get a response
1482             try:
1483                 r = self.queue.get(block=True, timeout=1)
1484             except Queue.Empty:
1485                 continue
1486
1487             if interface != self.network.interface:
1488                 break
1489
1490             if not r:
1491                 continue
1492
1493             # 3. handle response
1494             method = r['method']
1495             params = r['params']
1496             result = r.get('result')
1497             error = r.get('error')
1498             if error:
1499                 print "error", r
1500                 continue
1501
1502             if method == 'blockchain.address.subscribe':
1503                 addr = params[0]
1504                 if self.wallet.get_status(self.wallet.get_history(addr)) != result:
1505                     if requested_histories.get(addr) is None:
1506                         interface.send([('blockchain.address.get_history', [addr])], lambda i,r:self.queue.put(r))
1507                         requested_histories[addr] = result
1508
1509             elif method == 'blockchain.address.get_history':
1510                 addr = params[0]
1511                 print_error("receiving history", addr, result)
1512                 if result == ['*']:
1513                     assert requested_histories.pop(addr) == '*'
1514                     self.wallet.receive_history_callback(addr, result)
1515                 else:
1516                     hist = []
1517                     # check that txids are unique
1518                     txids = []
1519                     for item in result:
1520                         tx_hash = item['tx_hash']
1521                         if tx_hash not in txids:
1522                             txids.append(tx_hash)
1523                             hist.append( (tx_hash, item['height']) )
1524
1525                     if len(hist) != len(result):
1526                         raise BaseException("error: server sent history with non-unique txid", result)
1527
1528                     # check that the status corresponds to what was announced
1529                     rs = requested_histories.pop(addr)
1530                     if self.wallet.get_status(hist) != rs:
1531                         raise BaseException("error: status mismatch: %s"%addr)
1532
1533                     # store received history
1534                     self.wallet.receive_history_callback(addr, hist)
1535
1536                     # request transactions that we don't have
1537                     for tx_hash, tx_height in hist:
1538                         if self.wallet.transactions.get(tx_hash) is None:
1539                             if (tx_hash, tx_height) not in requested_tx and (tx_hash, tx_height) not in missing_tx:
1540                                 missing_tx.append( (tx_hash, tx_height) )
1541
1542             elif method == 'blockchain.transaction.get':
1543                 tx_hash = params[0]
1544                 tx_height = params[1]
1545                 assert tx_hash == hash_encode(Hash(result.decode('hex')))
1546                 tx = Transaction(result)
1547                 self.wallet.receive_tx_callback(tx_hash, tx, tx_height)
1548                 self.was_updated = True
1549                 requested_tx.remove( (tx_hash, tx_height) )
1550                 print_error("received tx:", tx_hash, len(tx.raw))
1551
1552             else:
1553                 print_error("Error: Unknown message:" + method + ", " + repr(params) + ", " + repr(result) )
1554
1555             if self.was_updated and not requested_tx:
1556                 self.wallet.network.trigger_callback('updated')
1557                 self.wallet.network.trigger_callback("new_transaction") # Updated gets called too many times from other places as well; if we use that signal we get the notification three times
1558
1559                 self.was_updated = False