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