backends/bitcoind/blockchain_processor.py

   1 from json import dumps, loads
   2 import leveldb, urllib
   3 import deserialize
   4 import ast, time, threading, hashlib
   5 from Queue import Queue
   6 import traceback, sys, os, random
   7
   8
   9 from util import Hash, hash_encode, hash_decode, rev_hex, int_to_hex
  10 from util import bc_address_to_hash_160, hash_160_to_bc_address, header_to_string, header_from_string
  11 from processor import Processor, print_log
  12
  13 class BlockchainProcessor(Processor):
  14
  15     def __init__(self, config, shared):
  16         Processor.__init__(self)
  17
  18         self.shared = shared
  19         self.config = config
  20         self.up_to_date = False
  21         self.watched_addresses = []
  22         self.history_cache = {}
  23         self.chunk_cache = {}
  24         self.cache_lock = threading.Lock()
  25         self.headers_data = ''
  26
  27         self.mempool_addresses = {}
  28         self.mempool_hist = {}
  29         self.mempool_hashes = []
  30         self.mempool_lock = threading.Lock()
  31
  32         self.address_queue = Queue()
  33         self.dbpath = config.get('leveldb', 'path')
  34
  35         self.dblock = threading.Lock()
  36         try:
  37             self.db = leveldb.LevelDB(self.dbpath)
  38         except:
  39             traceback.print_exc(file=sys.stdout)
  40             self.shared.stop()
  41
  42         self.bitcoind_url = 'http://%s:%s@%s:%s/' % (
  43             config.get('bitcoind','user'),
  44             config.get('bitcoind','password'),
  45             config.get('bitcoind','host'),
  46             config.get('bitcoind','port'))
  47
  48         self.height = 0
  49         self.is_test = False
  50         self.sent_height = 0
  51         self.sent_header = None
  52
  53
  54         try:
  55             hist = self.deserialize(self.db.Get('height'))
  56             self.last_hash, self.height, _ = hist[0]
  57             print_log( "hist", hist )
  58         except:
  59             #traceback.print_exc(file=sys.stdout)
  60             print_log('initializing database')
  61             self.height = 0
  62             self.last_hash = '000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f'
  63
  64         # catch_up headers
  65         self.init_headers(self.height)
  66
  67         threading.Timer(0, lambda: self.catch_up(sync=False)).start()
  68         while not shared.stopped() and not self.up_to_date:
  69             try:
  70                 time.sleep(1)
  71             except:
  72                 print "keyboard interrupt: stopping threads"
  73                 shared.stop()
  74                 sys.exit(0)
  75
  76         print_log( "blockchain is up to date." )
  77
  78         threading.Timer(10, self.main_iteration).start()
  79
  80
  81
  82     def bitcoind(self, method, params=[]):
  83         postdata = dumps({"method": method, 'params': params, 'id':'jsonrpc'})
  84         try:
  85             respdata = urllib.urlopen(self.bitcoind_url, postdata).read()
  86         except:
  87             traceback.print_exc(file=sys.stdout)
  88             self.shared.stop()
  89
  90         r = loads(respdata)
  91         if r['error'] != None:
  92             raise BaseException(r['error'])
  93         return r.get('result')
  94
  95
  96     def serialize(self, h):
  97         s = ''
  98         for txid, txpos, height in h:
  99             s += txid + int_to_hex(txpos, 4) + int_to_hex(height, 4)
 100         return s.decode('hex')
 101
 102
 103     def deserialize(self, s):
 104         h = []
 105         while s:
 106             txid = s[0:32].encode('hex')
 107             txpos = int( rev_hex( s[32:36].encode('hex') ), 16 )
 108             height = int( rev_hex( s[36:40].encode('hex') ), 16 )
 109             h.append( ( txid, txpos, height ) )
 110             s = s[40:]
 111         return h
 112
 113
 114     def block2header(self, b):
 115         return {"block_height":b.get('height'), "version":b.get('version'), "prev_block_hash":b.get('previousblockhash'),
 116                 "merkle_root":b.get('merkleroot'), "timestamp":b.get('time'), "bits":int(b.get('bits'),16), "nonce":b.get('nonce')}
 117
 118
 119     def get_header(self, height):
 120         block_hash = self.bitcoind('getblockhash', [height])
 121         b = self.bitcoind('getblock', [block_hash])
 122         return self.block2header(b)
 123
 124
 125     def init_headers(self, db_height):
 126         self.chunk_cache = {}
 127         self.headers_filename = os.path.join( self.dbpath, 'blockchain_headers')
 128
 129         if os.path.exists(self.headers_filename):
 130             height = os.path.getsize(self.headers_filename)/80 - 1   # the current height
 131             if height > 0:
 132                 prev_hash = self.hash_header(self.read_header(height))
 133             else:
 134                 prev_hash = None
 135         else:
 136             open(self.headers_filename,'wb').close()
 137             prev_hash = None
 138             height = -1
 139
 140         if height < db_height:
 141             print_log( "catching up missing headers:", height, db_height)
 142
 143         try:
 144             while height < db_height:
 145                 height = height + 1
 146                 header = self.get_header(height)
 147                 if height>1:
 148                     assert prev_hash == header.get('prev_block_hash')
 149                 self.write_header(header, sync=False)
 150                 prev_hash = self.hash_header(header)
 151                 if height%1000==0: print_log("headers file:",height)
 152         except KeyboardInterrupt:
 153             self.flush_headers()
 154             sys.exit()
 155
 156         self.flush_headers()
 157
 158
 159     def hash_header(self, header):
 160         return rev_hex(Hash(header_to_string(header).decode('hex')).encode('hex'))
 161
 162
 163     def read_header(self, block_height):
 164         if os.path.exists(self.headers_filename):
 165             f = open(self.headers_filename,'rb')
 166             f.seek(block_height*80)
 167             h = f.read(80)
 168             f.close()
 169             if len(h) == 80:
 170                 h = header_from_string(h)
 171                 return h
 172
 173
 174     def read_chunk(self, index):
 175         f = open(self.headers_filename,'rb')
 176         f.seek(index*2016*80)
 177         chunk = f.read(2016*80)
 178         f.close()
 179         return chunk.encode('hex')
 180
 181
 182     def write_header(self, header, sync=True):
 183         if not self.headers_data:
 184             self.headers_offset = header.get('block_height')
 185
 186         self.headers_data += header_to_string(header).decode('hex')
 187         if sync or len(self.headers_data) > 40*100:
 188             self.flush_headers()
 189
 190         with self.cache_lock:
 191             chunk_index = header.get('block_height')/2016
 192             if self.chunk_cache.get(chunk_index):
 193                 self.chunk_cache.pop(chunk_index)
 194
 195     def pop_header(self):
 196         # we need to do this only if we have not flushed
 197         if self.headers_data:
 198             self.headers_data = self.headers_data[:-40]
 199
 200     def flush_headers(self):
 201         if not self.headers_data: return
 202         f = open(self.headers_filename,'rb+')
 203         f.seek(self.headers_offset*80)
 204         f.write(self.headers_data)
 205         f.close()
 206         self.headers_data = ''
 207
 208
 209     def get_chunk(self, i):
 210         # store them on disk; store the current chunk in memory
 211         with self.cache_lock:
 212             chunk = self.chunk_cache.get(i)
 213             if not chunk:
 214                 chunk = self.read_chunk(i)
 215                 self.chunk_cache[i] = chunk
 216
 217         return chunk
 218
 219
 220     def get_transaction(self, txid, block_height=-1, is_coinbase = False):
 221         raw_tx = self.bitcoind('getrawtransaction', [txid, 0, block_height])
 222         vds = deserialize.BCDataStream()
 223         vds.write(raw_tx.decode('hex'))
 224         out = deserialize.parse_Transaction(vds, is_coinbase)
 225         return out
 226
 227
 228     def get_history(self, addr, cache_only=False):
 229         with self.cache_lock: hist = self.history_cache.get( addr )
 230         if hist is not None: return hist
 231         if cache_only: return -1
 232
 233         with self.dblock:
 234             try:
 235                 hash_160 = bc_address_to_hash_160(addr)
 236                 hist = self.deserialize(self.db.Get(hash_160))
 237                 is_known = True
 238             except:
 239                 hist = []
 240                 is_known = False
 241
 242         # should not be necessary
 243         hist.sort( key=lambda tup: tup[1])
 244         # check uniqueness too...
 245
 246         # add memory pool
 247         with self.mempool_lock:
 248             for txid in self.mempool_hist.get(addr,[]):
 249                 hist.append((txid, 0, 0))
 250
 251         hist = map(lambda x: {'tx_hash':x[0], 'height':x[2]}, hist)
 252         # add something to distinguish between unused and empty addresses
 253         if hist == [] and is_known: hist = ['*']
 254
 255         with self.cache_lock: self.history_cache[addr] = hist
 256         return hist
 257
 258
 259     def get_status(self, addr, cache_only=False):
 260         tx_points = self.get_history(addr, cache_only)
 261         if cache_only and tx_points == -1: return -1
 262
 263         if not tx_points: return None
 264         if tx_points == ['*']: return '*'
 265         status = ''
 266         for tx in tx_points:
 267             status += tx.get('tx_hash') + ':%d:' % tx.get('height')
 268         return hashlib.sha256( status ).digest().encode('hex')
 269
 270
 271     def get_merkle(self, tx_hash, height):
 272
 273         block_hash = self.bitcoind('getblockhash', [height])
 274         b = self.bitcoind('getblock', [block_hash])
 275         tx_list = b.get('tx')
 276         tx_pos = tx_list.index(tx_hash)
 277
 278         merkle = map(hash_decode, tx_list)
 279         target_hash = hash_decode(tx_hash)
 280         s = []
 281         while len(merkle) != 1:
 282             if len(merkle)%2: merkle.append( merkle[-1] )
 283             n = []
 284             while merkle:
 285                 new_hash = Hash( merkle[0] + merkle[1] )
 286                 if merkle[0] == target_hash:
 287                     s.append( hash_encode( merkle[1]))
 288                     target_hash = new_hash
 289                 elif merkle[1] == target_hash:
 290                     s.append( hash_encode( merkle[0]))
 291                     target_hash = new_hash
 292                 n.append( new_hash )
 293                 merkle = merkle[2:]
 294             merkle = n
 295
 296         return {"block_height":height, "merkle":s, "pos":tx_pos}
 297
 298
 299
 300
 301     def add_to_history(self, addr, tx_hash, tx_pos, tx_height):
 302
 303         # keep it sorted
 304         s = (tx_hash + int_to_hex(tx_pos, 4) + int_to_hex(tx_height, 4)).decode('hex')
 305
 306         serialized_hist = self.batch_list[addr]
 307
 308         l = len(serialized_hist)/40
 309         for i in range(l-1, -1, -1):
 310             item = serialized_hist[40*i:40*(i+1)]
 311             item_height = int( rev_hex( item[36:40].encode('hex') ), 16 )
 312             if item_height < tx_height:
 313                 serialized_hist = serialized_hist[0:40*(i+1)] + s + serialized_hist[40*(i+1):]
 314                 break
 315         else:
 316             serialized_hist = s + serialized_hist
 317
 318         self.batch_list[addr] = serialized_hist
 319
 320         # backlink
 321         txo = (tx_hash + int_to_hex(tx_pos, 4)).decode('hex')
 322         self.batch_txio[txo] = addr
 323
 324
 325     def remove_from_history(self, addr, tx_hash, tx_pos):
 326
 327         txi = (tx_hash + int_to_hex(tx_pos, 4)).decode('hex')
 328
 329         if addr is None:
 330             try:
 331                 addr = self.batch_txio[txi]
 332             except:
 333                 raise BaseException(tx_hash, tx_pos)
 334
 335         serialized_hist = self.batch_list[addr]
 336
 337         l = len(serialized_hist)/40
 338         for i in range(l):
 339             item = serialized_hist[40*i:40*(i+1)]
 340             if item[0:36] == txi:
 341                 height = int( rev_hex( item[36:40].encode('hex') ), 16 )
 342                 serialized_hist = serialized_hist[0:40*i] + serialized_hist[40*(i+1):]
 343                 break
 344         else:
 345             hist = self.deserialize(serialized_hist)
 346             raise BaseException("prevout not found", addr, hist, tx_hash, tx_pos)
 347
 348         self.batch_list[addr] = serialized_hist
 349         return height, addr
 350
 351
 352     def deserialize_block(self, block):
 353         txlist = block.get('tx')
 354         tx_hashes = []  # ordered txids
 355         txdict = {}     # deserialized tx
 356         is_coinbase = True
 357         for raw_tx in txlist:
 358             tx_hash = hash_encode(Hash(raw_tx.decode('hex')))
 359             tx_hashes.append(tx_hash)
 360             vds = deserialize.BCDataStream()
 361             vds.write(raw_tx.decode('hex'))
 362             tx = deserialize.parse_Transaction(vds, is_coinbase)
 363             txdict[tx_hash] = tx
 364             is_coinbase = False
 365         return tx_hashes, txdict
 366
 367     def get_undo_info(self, height):
 368         s = self.db.Get("undo%d"%(height%100))
 369         return eval(s)
 370
 371     def write_undo_info(self, batch, height, undo_info):
 372         if self.is_test or height > self.bitcoind_height - 100:
 373             batch.Put("undo%d"%(height%100), repr(undo_info))
 374
 375
 376     def import_block(self, block, block_hash, block_height, sync, revert=False):
 377
 378         self.batch_list = {}  # address -> history
 379         self.batch_txio = {}  # transaction i/o -> address
 380
 381         block_inputs = []
 382         block_outputs = []
 383         addr_to_read = []
 384
 385         # deserialize transactions
 386         t0 = time.time()
 387         tx_hashes, txdict = self.deserialize_block(block)
 388
 389         t00 = time.time()
 390
 391
 392         if not revert:
 393             # read addresses of tx inputs
 394             for tx in txdict.values():
 395                 for x in tx.get('inputs'):
 396                     txi = (x.get('prevout_hash') + int_to_hex(x.get('prevout_n'), 4)).decode('hex')
 397                     block_inputs.append(txi)
 398
 399             block_inputs.sort()
 400             for txi in block_inputs:
 401                 try:
 402                     addr = self.db.Get(txi)
 403                 except:
 404                     # the input could come from the same block
 405                     continue
 406                 self.batch_txio[txi] = addr
 407                 addr_to_read.append(addr)
 408
 409         else:
 410             for txid, tx in txdict.items():
 411                 for x in tx.get('outputs'):
 412                     txo = (txid + int_to_hex(x.get('index'), 4)).decode('hex')
 413                     block_outputs.append(txo)
 414
 415         # read histories of addresses
 416         for txid, tx in txdict.items():
 417             for x in tx.get('outputs'):
 418                 hash_160 = bc_address_to_hash_160(x.get('address'))
 419                 addr_to_read.append(hash_160)
 420
 421         addr_to_read.sort()
 422         for addr in addr_to_read:
 423             try:
 424                 self.batch_list[addr] = self.db.Get(addr)
 425             except:
 426                 self.batch_list[addr] = ''
 427
 428
 429         if revert:
 430             undo_info = self.get_undo_info(block_height)
 431             # print "undo", block_height, undo_info
 432         else: undo_info = {}
 433
 434         # process
 435         t1 = time.time()
 436
 437         if revert: tx_hashes = tx_hashes[::-1]
 438         for txid in tx_hashes: # must be ordered
 439             tx = txdict[txid]
 440             if not revert:
 441
 442                 undo = []
 443                 for x in tx.get('inputs'):
 444                     prevout_height, prevout_addr = self.remove_from_history( None, x.get('prevout_hash'), x.get('prevout_n'))
 445                     undo.append( (prevout_height, prevout_addr) )
 446                 undo_info[txid] = undo
 447
 448                 for x in tx.get('outputs'):
 449                     hash_160 = bc_address_to_hash_160(x.get('address'))
 450                     self.add_to_history( hash_160, txid, x.get('index'), block_height)
 451
 452             else:
 453                 for x in tx.get('outputs'):
 454                     hash_160 = bc_address_to_hash_160(x.get('address'))
 455                     self.remove_from_history( hash_160, txid, x.get('index'))
 456
 457                 i = 0
 458                 for x in tx.get('inputs'):
 459                     prevout_height, prevout_addr = undo_info.get(txid)[i]
 460                     i += 1
 461
 462                     # read the history into batch list
 463                     if self.batch_list.get(prevout_addr) is None:
 464                         self.batch_list[prevout_addr] = self.db.Get(prevout_addr)
 465
 466                     # re-add them to the history
 467                     self.add_to_history( prevout_addr, x.get('prevout_hash'), x.get('prevout_n'), prevout_height)
 468                     # print_log( "new hist for", hash_160_to_bc_address(prevout_addr), self.deserialize(self.batch_list[prevout_addr]) )
 469
 470         # write
 471         max_len = 0
 472         max_addr = ''
 473         t2 = time.time()
 474
 475         batch = leveldb.WriteBatch()
 476         for addr, serialized_hist in self.batch_list.items():
 477             batch.Put(addr, serialized_hist)
 478             l = len(serialized_hist)
 479             if l > max_len:
 480                 max_len = l
 481                 max_addr = addr
 482
 483         if not revert:
 484             # add new created outputs
 485             for txio, addr in self.batch_txio.items():
 486                 batch.Put(txio, addr)
 487             # delete spent inputs
 488             for txi in block_inputs:
 489                 batch.Delete(txi)
 490             # add undo info
 491             self.write_undo_info(batch, block_height, undo_info)
 492         else:
 493             # restore spent inputs
 494             for txio, addr in self.batch_txio.items():
 495                 batch.Put(txio, addr)
 496             # delete spent outputs
 497             for txo in block_outputs:
 498                 batch.Delete(txo)
 499
 500
 501         # add the max
 502         batch.Put('height', self.serialize( [(block_hash, block_height, 0)] ) )
 503
 504         # actual write
 505         self.db.Write(batch, sync = sync)
 506
 507         t3 = time.time()
 508         if t3 - t0 > 10 and not sync:
 509             print_log("block", block_height,
 510                       "parse:%0.2f "%(t00 - t0),
 511                       "read:%0.2f "%(t1 - t00),
 512                       "proc:%.2f "%(t2-t1),
 513                       "write:%.2f "%(t3-t2),
 514                       "max:", max_len, hash_160_to_bc_address(max_addr))
 515
 516         for h160 in self.batch_list.keys():
 517             addr = hash_160_to_bc_address(h160)
 518             self.invalidate_cache(addr)
 519
 520
 521
 522     def add_request(self, request):
 523         # see if we can get if from cache. if not, add to queue
 524         if self.process( request, cache_only = True) == -1:
 525             self.queue.put(request)
 526
 527
 528
 529     def process(self, request, cache_only = False):
 530         #print "abe process", request
 531
 532         message_id = request['id']
 533         method = request['method']
 534         params = request.get('params',[])
 535         result = None
 536         error = None
 537
 538         if method == 'blockchain.numblocks.subscribe':
 539             result = self.height
 540
 541         elif method == 'blockchain.headers.subscribe':
 542             result = self.header
 543
 544         elif method == 'blockchain.address.subscribe':
 545             try:
 546                 address = params[0]
 547                 result = self.get_status(address, cache_only)
 548                 self.watch_address(address)
 549             except BaseException, e:
 550                 error = str(e) + ': ' + address
 551                 print_log( "error:", error )
 552
 553         elif method == 'blockchain.address.unsubscribe':
 554             try:
 555                 password = params[0]
 556                 address = params[1]
 557                 if password == self.config.get('server','password'):
 558                     self.watched_addresses.remove(address)
 559                     print_log('unsubscribed', address)
 560                     result = "ok"
 561                 else:
 562                     print_log('incorrect password')
 563                     result = "authentication error"
 564             except BaseException, e:
 565                 error = str(e) + ': ' + address
 566                 print_log( "error:", error )
 567
 568         elif method == 'blockchain.address.get_history':
 569             try:
 570                 address = params[0]
 571                 result = self.get_history( address, cache_only )
 572             except BaseException, e:
 573                 error = str(e) + ': ' + address
 574                 print_log( "error:", error )
 575
 576         elif method == 'blockchain.block.get_header':
 577             if cache_only:
 578                 result = -1
 579             else:
 580                 try:
 581                     height = params[0]
 582                     result = self.get_header( height )
 583                 except BaseException, e:
 584                     error = str(e) + ': %d'% height
 585                     print_log( "error:", error )
 586
 587         elif method == 'blockchain.block.get_chunk':
 588             if cache_only:
 589                 result = -1
 590             else:
 591                 try:
 592                     index = params[0]
 593                     result = self.get_chunk( index )
 594                 except BaseException, e:
 595                     error = str(e) + ': %d'% index
 596                     print_log( "error:", error)
 597
 598         elif method == 'blockchain.transaction.broadcast':
 599             try:
 600                 txo = self.bitcoind('sendrawtransaction', params)
 601                 print_log( "sent tx:", txo )
 602                 result = txo
 603             except BaseException, e:
 604                 result = str(e) # do not send an error
 605                 print_log( "error:", str(e), params )
 606
 607         elif method == 'blockchain.transaction.get_merkle':
 608             if cache_only:
 609                 result = -1
 610             else:
 611                 try:
 612                     tx_hash = params[0]
 613                     tx_height = params[1]
 614                     result = self.get_merkle(tx_hash, tx_height)
 615                 except BaseException, e:
 616                     error = str(e) + ': ' + tx_hash
 617                     print_log( "error:", error )
 618
 619         elif method == 'blockchain.transaction.get':
 620             try:
 621                 tx_hash = params[0]
 622                 height = params[1]
 623                 result = self.bitcoind('getrawtransaction', [tx_hash, 0, height] )
 624             except BaseException, e:
 625                 error = str(e) + ': ' + tx_hash
 626                 print_log( "error:", error )
 627
 628         else:
 629             error = "unknown method:%s"%method
 630
 631         if cache_only and result == -1: return -1
 632
 633         if error:
 634             response = { 'id':message_id, 'error':error }
 635             self.push_response(response)
 636         elif result != '':
 637             response = { 'id':message_id, 'result':result }
 638             self.push_response(response)
 639
 640
 641     def watch_address(self, addr):
 642         if addr not in self.watched_addresses:
 643             self.watched_addresses.append(addr)
 644
 645
 646
 647     def catch_up(self, sync = True):
 648
 649         t1 = time.time()
 650
 651         while not self.shared.stopped():
 652
 653             # are we done yet?
 654             info = self.bitcoind('getinfo')
 655             self.bitcoind_height = info.get('blocks')
 656             bitcoind_block_hash = self.bitcoind('getblockhash', [self.bitcoind_height])
 657             if self.last_hash == bitcoind_block_hash:
 658                 self.up_to_date = True
 659                 break
 660
 661             # not done..
 662             self.up_to_date = False
 663             next_block_hash = self.bitcoind('getblockhash', [self.height+1])
 664             next_block = self.bitcoind('getblock', [next_block_hash, 1])
 665
 666             # fixme: this is unsafe, if we revert when the undo info is not yet written
 667             revert = (random.randint(1, 100)==1) if self.is_test else False
 668
 669             if (next_block.get('previousblockhash') == self.last_hash) and not revert:
 670
 671                 self.import_block(next_block, next_block_hash, self.height+1, sync)
 672                 self.height = self.height + 1
 673                 self.write_header(self.block2header(next_block), sync)
 674                 self.last_hash = next_block_hash
 675
 676                 if (self.height)%100 == 0 and not sync:
 677                     t2 = time.time()
 678                     print_log( "catch_up: block %d (%.3fs)"%( self.height, t2 - t1 ) )
 679                     t1 = t2
 680
 681             else:
 682                 # revert current block
 683                 block = self.bitcoind('getblock', [self.last_hash, 1])
 684                 print_log( "blockchain reorg", self.height, block.get('previousblockhash'), self.last_hash )
 685                 self.import_block(block, self.last_hash, self.height, sync, revert=True)
 686                 self.pop_header()
 687                 self.flush_headers()
 688
 689                 self.height = self.height -1
 690
 691                 # read previous header from disk
 692                 self.header = self.read_header(self.height)
 693                 self.last_hash = self.hash_header(self.header)
 694
 695
 696         self.header = self.block2header(self.bitcoind('getblock', [self.last_hash]))
 697
 698
 699
 700
 701     def memorypool_update(self):
 702
 703         mempool_hashes = self.bitcoind('getrawmempool')
 704
 705         for tx_hash in mempool_hashes:
 706             if tx_hash in self.mempool_hashes: continue
 707
 708             tx = self.get_transaction(tx_hash)
 709             if not tx: continue
 710
 711             for x in tx.get('inputs'):
 712                 txi = (x.get('prevout_hash') + int_to_hex(x.get('prevout_n'), 4)).decode('hex')
 713                 try:
 714                     h160 = self.db.Get(txi)
 715                     addr = hash_160_to_bc_address(h160)
 716                 except:
 717                     continue
 718                 l = self.mempool_addresses.get(tx_hash, [])
 719                 if addr not in l:
 720                     l.append( addr )
 721                     self.mempool_addresses[tx_hash] = l
 722
 723             for x in tx.get('outputs'):
 724                 addr = x.get('address')
 725                 l = self.mempool_addresses.get(tx_hash, [])
 726                 if addr not in l:
 727                     l.append( addr )
 728                     self.mempool_addresses[tx_hash] = l
 729
 730             self.mempool_hashes.append(tx_hash)
 731
 732         # remove older entries from mempool_hashes
 733         self.mempool_hashes = mempool_hashes
 734
 735         # remove deprecated entries from mempool_addresses
 736         for tx_hash, addresses in self.mempool_addresses.items():
 737             if tx_hash not in self.mempool_hashes:
 738                 self.mempool_addresses.pop(tx_hash)
 739
 740         # rebuild histories
 741         new_mempool_hist = {}
 742         for tx_hash, addresses in self.mempool_addresses.items():
 743             for addr in addresses:
 744                 h = new_mempool_hist.get(addr, [])
 745                 if tx_hash not in h:
 746                     h.append( tx_hash )
 747                 new_mempool_hist[addr] = h
 748
 749         for addr in new_mempool_hist.keys():
 750             if addr in self.mempool_hist.keys():
 751                 if self.mempool_hist[addr] != new_mempool_hist[addr]:
 752                     self.invalidate_cache(addr)
 753             else:
 754                 self.invalidate_cache(addr)
 755
 756         with self.mempool_lock:
 757             self.mempool_hist = new_mempool_hist
 758
 759
 760
 761     def invalidate_cache(self, address):
 762         with self.cache_lock:
 763             if self.history_cache.has_key(address):
 764                 print_log( "cache: invalidating", address )
 765                 self.history_cache.pop(address)
 766
 767         if address in self.watched_addresses:
 768             self.address_queue.put(address)
 769
 770
 771
 772     def main_iteration(self):
 773
 774         if self.shared.stopped():
 775             print_log( "blockchain processor terminating" )
 776             return
 777
 778         with self.dblock:
 779             t1 = time.time()
 780             self.catch_up()
 781             t2 = time.time()
 782
 783         self.memorypool_update()
 784         t3 = time.time()
 785         # print "mempool:", len(self.mempool_addresses), len(self.mempool_hist), "%.3fs"%(t3 - t2)
 786
 787
 788         if self.sent_height != self.height:
 789             self.sent_height = self.height
 790             self.push_response({ 'id': None, 'method':'blockchain.numblocks.subscribe', 'params':[self.height] })
 791
 792         if self.sent_header != self.header:
 793             print_log( "blockchain: %d (%.3fs)"%( self.height, t2 - t1 ) )
 794             self.sent_header = self.header
 795             self.push_response({ 'id': None, 'method':'blockchain.headers.subscribe', 'params':[self.header] })
 796
 797         while True:
 798             try:
 799                 addr = self.address_queue.get(False)
 800             except:
 801                 break
 802             if addr in self.watched_addresses:
 803                 status = self.get_status( addr )
 804                 self.push_response({ 'id': None, 'method':'blockchain.address.subscribe', 'params':[addr, status] })
 805
 806         if not self.shared.stopped():
 807             threading.Timer(10, self.main_iteration).start()
 808         else:
 809             print_log( "blockchain processor terminating" )
 810
 811
 812
 813