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         with self.cache_lock:
 186             chunk_index = header.get('block_height')/2016
 187             if self.chunk_cache.get(chunk_index):
 188                 self.chunk_cache.pop(chunk_index)
 189
 190     def pop_header(self):
 191         # we need to do this only if we have not flushed
 192         if self.headers_data:
 193             self.headers_data = self.headers_data[:-40]
 194
 195     def flush_headers(self):
 196         if not self.headers_data: return
 197         f = open(self.headers_filename,'rb+')
 198         f.seek(self.headers_offset*80)
 199         f.write(self.headers_data)
 200         f.close()
 201         self.headers_data = ''
 202
 203
 204     def get_chunk(self, i):
 205         # store them on disk; store the current chunk in memory
 206         with self.cache_lock:
 207             chunk = self.chunk_cache.get(i)
 208             if not chunk:
 209                 chunk = self.read_chunk(i)
 210                 self.chunk_cache[i] = chunk
 211
 212         return chunk
 213
 214
 215     def get_transaction(self, txid, block_height=-1, is_coinbase = False):
 216         raw_tx = self.bitcoind('getrawtransaction', [txid, 0, block_height])
 217         vds = deserialize.BCDataStream()
 218         vds.write(raw_tx.decode('hex'))
 219         out = deserialize.parse_Transaction(vds, is_coinbase)
 220         return out
 221
 222
 223     def get_history(self, addr, cache_only=False):
 224         with self.cache_lock: hist = self.history_cache.get( addr )
 225         if hist is not None: return hist
 226         if cache_only: return -1
 227
 228         with self.dblock:
 229             try:
 230                 hash_160 = bc_address_to_hash_160(addr)
 231                 hist = self.deserialize(self.db.Get(hash_160))
 232                 is_known = True
 233             except:
 234                 hist = []
 235                 is_known = False
 236
 237         # should not be necessary
 238         hist.sort( key=lambda tup: tup[1])
 239         # check uniqueness too...
 240
 241         # add memory pool
 242         with self.mempool_lock:
 243             for txid in self.mempool_hist.get(addr,[]):
 244                 hist.append((txid, 0, 0))
 245
 246         hist = map(lambda x: {'tx_hash':x[0], 'height':x[2]}, hist)
 247         # add something to distinguish between unused and empty addresses
 248         if hist == [] and is_known: hist = ['*']
 249
 250         with self.cache_lock: self.history_cache[addr] = hist
 251         return hist
 252
 253
 254     def get_status(self, addr, cache_only=False):
 255         tx_points = self.get_history(addr, cache_only)
 256         if cache_only and tx_points == -1: return -1
 257
 258         if not tx_points: return None
 259         if tx_points == ['*']: return '*'
 260         status = ''
 261         for tx in tx_points:
 262             status += tx.get('tx_hash') + ':%d:' % tx.get('height')
 263         return hashlib.sha256( status ).digest().encode('hex')
 264
 265
 266     def get_merkle(self, tx_hash, height):
 267
 268         block_hash = self.bitcoind('getblockhash', [height])
 269         b = self.bitcoind('getblock', [block_hash])
 270         tx_list = b.get('tx')
 271         tx_pos = tx_list.index(tx_hash)
 272
 273         merkle = map(hash_decode, tx_list)
 274         target_hash = hash_decode(tx_hash)
 275         s = []
 276         while len(merkle) != 1:
 277             if len(merkle)%2: merkle.append( merkle[-1] )
 278             n = []
 279             while merkle:
 280                 new_hash = Hash( merkle[0] + merkle[1] )
 281                 if merkle[0] == target_hash:
 282                     s.append( hash_encode( merkle[1]))
 283                     target_hash = new_hash
 284                 elif merkle[1] == target_hash:
 285                     s.append( hash_encode( merkle[0]))
 286                     target_hash = new_hash
 287                 n.append( new_hash )
 288                 merkle = merkle[2:]
 289             merkle = n
 290
 291         return {"block_height":height, "merkle":s, "pos":tx_pos}
 292
 293
 294
 295
 296     def add_to_history(self, addr, tx_hash, tx_pos, tx_height):
 297
 298         # keep it sorted
 299         s = (tx_hash + int_to_hex(tx_pos, 4) + int_to_hex(tx_height, 4)).decode('hex')
 300
 301         serialized_hist = self.batch_list[addr]
 302
 303         l = len(serialized_hist)/40
 304         for i in range(l-1, -1, -1):
 305             item = serialized_hist[40*i:40*(i+1)]
 306             item_height = int( rev_hex( item[36:40].encode('hex') ), 16 )
 307             if item_height < tx_height:
 308                 serialized_hist = serialized_hist[0:40*(i+1)] + s + serialized_hist[40*(i+1):]
 309                 break
 310         else:
 311             serialized_hist = s + serialized_hist
 312
 313         self.batch_list[addr] = serialized_hist
 314
 315         # backlink
 316         txo = (tx_hash + int_to_hex(tx_pos, 4)).decode('hex')
 317         self.batch_txio[txo] = addr
 318
 319
 320     def remove_from_history(self, addr, tx_hash, tx_pos):
 321
 322         txi = (tx_hash + int_to_hex(tx_pos, 4)).decode('hex')
 323
 324         if addr is None:
 325             try:
 326                 addr = self.batch_txio[txi]
 327             except:
 328                 raise BaseException(tx_hash, tx_pos)
 329
 330         serialized_hist = self.batch_list[addr]
 331
 332         l = len(serialized_hist)/40
 333         for i in range(l):
 334             item = serialized_hist[40*i:40*(i+1)]
 335             if item[0:36] == txi:
 336                 height = int( rev_hex( item[36:40].encode('hex') ), 16 )
 337                 serialized_hist = serialized_hist[0:40*i] + serialized_hist[40*(i+1):]
 338                 break
 339         else:
 340             hist = self.deserialize(serialized_hist)
 341             raise BaseException("prevout not found", addr, hist, tx_hash, tx_pos)
 342
 343         self.batch_list[addr] = serialized_hist
 344         return height, addr
 345
 346
 347     def deserialize_block(self, block):
 348         txlist = block.get('tx')
 349         tx_hashes = []  # ordered txids
 350         txdict = {}     # deserialized tx
 351         is_coinbase = True
 352         for raw_tx in txlist:
 353             tx_hash = hash_encode(Hash(raw_tx.decode('hex')))
 354             tx_hashes.append(tx_hash)
 355             vds = deserialize.BCDataStream()
 356             vds.write(raw_tx.decode('hex'))
 357             tx = deserialize.parse_Transaction(vds, is_coinbase)
 358             txdict[tx_hash] = tx
 359             is_coinbase = False
 360         return tx_hashes, txdict
 361
 362     def get_undo_info(self, height):
 363         s = self.db.Get("undo%d"%(height%100))
 364         return eval(s)
 365
 366     def write_undo_info(self, batch, height, undo_info):
 367         if self.is_test or height > self.bitcoind_height - 100:
 368             batch.Put("undo%d"%(height%100), repr(undo_info))
 369
 370
 371     def import_block(self, block, block_hash, block_height, sync, revert=False):
 372
 373         self.batch_list = {}  # address -> history
 374         self.batch_txio = {}  # transaction i/o -> address
 375
 376         block_inputs = []
 377         block_outputs = []
 378         addr_to_read = []
 379
 380         # deserialize transactions
 381         t0 = time.time()
 382         tx_hashes, txdict = self.deserialize_block(block)
 383
 384         t00 = time.time()
 385
 386
 387         if not revert:
 388             # read addresses of tx inputs
 389             for tx in txdict.values():
 390                 for x in tx.get('inputs'):
 391                     txi = (x.get('prevout_hash') + int_to_hex(x.get('prevout_n'), 4)).decode('hex')
 392                     block_inputs.append(txi)
 393
 394             block_inputs.sort()
 395             for txi in block_inputs:
 396                 try:
 397                     addr = self.db.Get(txi)
 398                 except:
 399                     # the input could come from the same block
 400                     continue
 401                 self.batch_txio[txi] = addr
 402                 addr_to_read.append(addr)
 403
 404         else:
 405             for txid, tx in txdict.items():
 406                 for x in tx.get('outputs'):
 407                     txo = (txid + int_to_hex(x.get('index'), 4)).decode('hex')
 408                     block_outputs.append(txo)
 409
 410         # read histories of addresses
 411         for txid, tx in txdict.items():
 412             for x in tx.get('outputs'):
 413                 hash_160 = bc_address_to_hash_160(x.get('address'))
 414                 addr_to_read.append(hash_160)
 415
 416         addr_to_read.sort()
 417         for addr in addr_to_read:
 418             try:
 419                 self.batch_list[addr] = self.db.Get(addr)
 420             except:
 421                 self.batch_list[addr] = ''
 422
 423
 424         if revert:
 425             undo_info = self.get_undo_info(block_height)
 426             # print "undo", block_height, undo_info
 427         else: undo_info = {}
 428
 429         # process
 430         t1 = time.time()
 431
 432         if revert: tx_hashes = tx_hashes[::-1]
 433         for txid in tx_hashes: # must be ordered
 434             tx = txdict[txid]
 435             if not revert:
 436
 437                 undo = []
 438                 for x in tx.get('inputs'):
 439                     prevout_height, prevout_addr = self.remove_from_history( None, x.get('prevout_hash'), x.get('prevout_n'))
 440                     undo.append( (prevout_height, prevout_addr) )
 441                 undo_info[txid] = undo
 442
 443                 for x in tx.get('outputs'):
 444                     hash_160 = bc_address_to_hash_160(x.get('address'))
 445                     self.add_to_history( hash_160, txid, x.get('index'), block_height)
 446
 447             else:
 448                 for x in tx.get('outputs'):
 449                     hash_160 = bc_address_to_hash_160(x.get('address'))
 450                     self.remove_from_history( hash_160, txid, x.get('index'))
 451
 452                 i = 0
 453                 for x in tx.get('inputs'):
 454                     prevout_height, prevout_addr = undo_info.get(txid)[i]
 455                     i += 1
 456
 457                     # read the history into batch list
 458                     if self.batch_list.get(prevout_addr) is None:
 459                         self.batch_list[prevout_addr] = self.db.Get(prevout_addr)
 460
 461                     # re-add them to the history
 462                     self.add_to_history( prevout_addr, x.get('prevout_hash'), x.get('prevout_n'), prevout_height)
 463                     print_log( "new hist for", hash_160_to_bc_address(prevout_addr), self.deserialize(self.batch_list[prevout_addr]) )
 464
 465         # write
 466         max_len = 0
 467         max_addr = ''
 468         t2 = time.time()
 469
 470         batch = leveldb.WriteBatch()
 471         for addr, serialized_hist in self.batch_list.items():
 472             batch.Put(addr, serialized_hist)
 473             l = len(serialized_hist)
 474             if l > max_len:
 475                 max_len = l
 476                 max_addr = addr
 477
 478         if not revert:
 479             # add new created outputs
 480             for txio, addr in self.batch_txio.items():
 481                 batch.Put(txio, addr)
 482             # delete spent inputs
 483             for txi in block_inputs:
 484                 batch.Delete(txi)
 485             # add undo info
 486             self.write_undo_info(batch, block_height, undo_info)
 487         else:
 488             # restore spent inputs
 489             for txio, addr in self.batch_txio.items():
 490                 batch.Put(txio, addr)
 491             # delete spent outputs
 492             for txo in block_outputs:
 493                 batch.Delete(txo)
 494
 495
 496         # add the max
 497         batch.Put('height', self.serialize( [(block_hash, block_height, 0)] ) )
 498
 499         # actual write
 500         self.db.Write(batch, sync = sync)
 501
 502         t3 = time.time()
 503         if t3 - t0 > 10 and not sync:
 504             print_log("block", block_height,
 505                       "parse:%0.2f "%(t00 - t0),
 506                       "read:%0.2f "%(t1 - t00),
 507                       "proc:%.2f "%(t2-t1),
 508                       "write:%.2f "%(t3-t2),
 509                       "max:", max_len, hash_160_to_bc_address(max_addr))
 510
 511         for h160 in self.batch_list.keys():
 512             addr = hash_160_to_bc_address(h160)
 513             self.invalidate_cache(addr)
 514
 515
 516
 517     def add_request(self, request):
 518         # see if we can get if from cache. if not, add to queue
 519         if self.process( request, cache_only = True) == -1:
 520             self.queue.put(request)
 521
 522
 523
 524     def process(self, request, cache_only = False):
 525         #print "abe process", request
 526
 527         message_id = request['id']
 528         method = request['method']
 529         params = request.get('params',[])
 530         result = None
 531         error = None
 532
 533         if method == 'blockchain.numblocks.subscribe':
 534             result = self.height
 535
 536         elif method == 'blockchain.headers.subscribe':
 537             result = self.header
 538
 539         elif method == 'blockchain.address.subscribe':
 540             try:
 541                 address = params[0]
 542                 result = self.get_status(address, cache_only)
 543                 self.watch_address(address)
 544             except BaseException, e:
 545                 error = str(e) + ': ' + address
 546                 print_log( "error:", error )
 547
 548         elif method == 'blockchain.address.unsubscribe':
 549             try:
 550                 password = params[0]
 551                 address = params[1]
 552                 if password == self.config.get('server','password'):
 553                     self.watched_addresses.remove(address)
 554                     print_log('unsubscribed', address)
 555                     result = "ok"
 556                 else:
 557                     print_log('incorrect password')
 558                     result = "authentication error"
 559             except BaseException, e:
 560                 error = str(e) + ': ' + address
 561                 print_log( "error:", error )
 562
 563         elif method == 'blockchain.address.get_history':
 564             try:
 565                 address = params[0]
 566                 result = self.get_history( address, cache_only )
 567             except BaseException, e:
 568                 error = str(e) + ': ' + address
 569                 print_log( "error:", error )
 570
 571         elif method == 'blockchain.block.get_header':
 572             if cache_only:
 573                 result = -1
 574             else:
 575                 try:
 576                     height = params[0]
 577                     result = self.get_header( height )
 578                 except BaseException, e:
 579                     error = str(e) + ': %d'% height
 580                     print_log( "error:", error )
 581
 582         elif method == 'blockchain.block.get_chunk':
 583             if cache_only:
 584                 result = -1
 585             else:
 586                 try:
 587                     index = params[0]
 588                     result = self.get_chunk( index )
 589                 except BaseException, e:
 590                     error = str(e) + ': %d'% index
 591                     print_log( "error:", error)
 592
 593         elif method == 'blockchain.transaction.broadcast':
 594             txo = self.bitcoind('sendrawtransaction', params)
 595             print_log( "sent tx:", txo )
 596             result = txo
 597
 598         elif method == 'blockchain.transaction.get_merkle':
 599             if cache_only:
 600                 result = -1
 601             else:
 602                 try:
 603                     tx_hash = params[0]
 604                     tx_height = params[1]
 605                     result = self.get_merkle(tx_hash, tx_height)
 606                 except BaseException, e:
 607                     error = str(e) + ': ' + tx_hash
 608                     print_log( "error:", error )
 609
 610         elif method == 'blockchain.transaction.get':
 611             try:
 612                 tx_hash = params[0]
 613                 height = params[1]
 614                 result = self.bitcoind('getrawtransaction', [tx_hash, 0, height] )
 615             except BaseException, e:
 616                 error = str(e) + ': ' + tx_hash
 617                 print_log( "error:", error )
 618
 619         else:
 620             error = "unknown method:%s"%method
 621
 622         if cache_only and result == -1: return -1
 623
 624         if error:
 625             response = { 'id':message_id, 'error':error }
 626             self.push_response(response)
 627         elif result != '':
 628             response = { 'id':message_id, 'result':result }
 629             self.push_response(response)
 630
 631
 632     def watch_address(self, addr):
 633         if addr not in self.watched_addresses:
 634             self.watched_addresses.append(addr)
 635
 636
 637
 638     def catch_up(self, sync = True):
 639
 640         t1 = time.time()
 641
 642         while not self.shared.stopped():
 643
 644             # are we done yet?
 645             info = self.bitcoind('getinfo')
 646             self.bitcoind_height = info.get('blocks')
 647             bitcoind_block_hash = self.bitcoind('getblockhash', [self.bitcoind_height])
 648             if self.last_hash == bitcoind_block_hash:
 649                 self.up_to_date = True
 650                 break
 651
 652             # not done..
 653             self.up_to_date = False
 654             next_block_hash = self.bitcoind('getblockhash', [self.height+1])
 655             next_block = self.bitcoind('getblock', [next_block_hash, 1])
 656
 657             # fixme: this is unsafe, if we revert when the undo info is not yet written
 658             revert = (random.randint(1, 100)==1) if self.is_test else False
 659
 660             if (next_block.get('previousblockhash') == self.last_hash) and not revert:
 661
 662                 self.import_block(next_block, next_block_hash, self.height+1, sync)
 663                 self.height = self.height + 1
 664                 self.write_header(self.block2header(next_block), sync)
 665                 self.last_hash = next_block_hash
 666
 667                 if (self.height)%100 == 0 and not sync:
 668                     t2 = time.time()
 669                     print_log( "catch_up: block %d (%.3fs)"%( self.height, t2 - t1 ) )
 670                     t1 = t2
 671
 672             else:
 673                 # revert current block
 674                 block = self.bitcoind('getblock', [self.last_hash, 1])
 675                 print_log( "blockchain reorg", self.height, block.get('previousblockhash'), self.last_hash )
 676                 self.import_block(block, self.last_hash, self.height, sync, revert=True)
 677                 self.pop_header()
 678                 self.flush_headers()
 679
 680                 self.height = self.height -1
 681
 682                 # read previous header from disk
 683                 self.header = self.read_header(self.height)
 684                 self.last_hash = self.hash_header(self.header)
 685
 686
 687         self.header = self.block2header(self.bitcoind('getblock', [self.last_hash]))
 688
 689
 690
 691
 692     def memorypool_update(self):
 693
 694         mempool_hashes = self.bitcoind('getrawmempool')
 695
 696         for tx_hash in mempool_hashes:
 697             if tx_hash in self.mempool_hashes: continue
 698
 699             tx = self.get_transaction(tx_hash)
 700             if not tx: continue
 701
 702             for x in tx.get('inputs'):
 703                 txi = (x.get('prevout_hash') + int_to_hex(x.get('prevout_n'), 4)).decode('hex')
 704                 try:
 705                     h160 = self.db.Get(txi)
 706                     addr = hash_160_to_bc_address(h160)
 707                 except:
 708                     continue
 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             for x in tx.get('outputs'):
 715                 addr = x.get('address')
 716                 l = self.mempool_addresses.get(tx_hash, [])
 717                 if addr not in l:
 718                     l.append( addr )
 719                     self.mempool_addresses[tx_hash] = l
 720
 721             self.mempool_hashes.append(tx_hash)
 722
 723         # remove older entries from mempool_hashes
 724         self.mempool_hashes = mempool_hashes
 725
 726         # remove deprecated entries from mempool_addresses
 727         for tx_hash, addresses in self.mempool_addresses.items():
 728             if tx_hash not in self.mempool_hashes:
 729                 self.mempool_addresses.pop(tx_hash)
 730
 731         # rebuild histories
 732         new_mempool_hist = {}
 733         for tx_hash, addresses in self.mempool_addresses.items():
 734             for addr in addresses:
 735                 h = new_mempool_hist.get(addr, [])
 736                 if tx_hash not in h:
 737                     h.append( tx_hash )
 738                 new_mempool_hist[addr] = h
 739
 740         for addr in new_mempool_hist.keys():
 741             if addr in self.mempool_hist.keys():
 742                 if self.mempool_hist[addr] != new_mempool_hist[addr]:
 743                     self.invalidate_cache(addr)
 744             else:
 745                 self.invalidate_cache(addr)
 746
 747         with self.mempool_lock:
 748             self.mempool_hist = new_mempool_hist
 749
 750
 751
 752     def invalidate_cache(self, address):
 753         with self.cache_lock:
 754             if self.history_cache.has_key(address):
 755                 print_log( "cache: invalidating", address )
 756                 self.history_cache.pop(address)
 757
 758         if address in self.watched_addresses:
 759             self.address_queue.put(address)
 760
 761
 762
 763     def main_iteration(self):
 764
 765         if self.shared.stopped():
 766             print_log( "blockchain processor terminating" )
 767             return
 768
 769         with self.dblock:
 770             t1 = time.time()
 771             self.catch_up()
 772             t2 = time.time()
 773
 774         self.memorypool_update()
 775         t3 = time.time()
 776         # print "mempool:", len(self.mempool_addresses), len(self.mempool_hist), "%.3fs"%(t3 - t2)
 777
 778
 779         if self.sent_height != self.height:
 780             self.sent_height = self.height
 781             self.push_response({ 'id': None, 'method':'blockchain.numblocks.subscribe', 'params':[self.height] })
 782
 783         if self.sent_header != self.header:
 784             print_log( "blockchain: %d (%.3fs)"%( self.height, t2 - t1 ) )
 785             self.sent_header = self.header
 786             self.push_response({ 'id': None, 'method':'blockchain.headers.subscribe', 'params':[self.header] })
 787
 788         while True:
 789             try:
 790                 addr = self.address_queue.get(False)
 791             except:
 792                 break
 793             if addr in self.watched_addresses:
 794                 status = self.get_status( addr )
 795                 self.push_response({ 'id': None, 'method':'blockchain.address.subscribe', 'params':[addr, status] })
 796
 797         if not self.shared.stopped():
 798             threading.Timer(10, self.main_iteration).start()
 799         else:
 800             print_log( "blockchain processor terminating" )
 801
 802
 803
 804