lib/interface.py

   1 #!/usr/bin/env python
   2 #
   3 # Electrum - lightweight Bitcoin client
   4 # Copyright (C) 2011 thomasv@gitorious
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
  18
  19
  20 import random, socket, ast, re
  21 import threading, traceback, sys, time, json, Queue
  22
  23 from version import ELECTRUM_VERSION
  24
  25 DEFAULT_TIMEOUT = 5
  26 DEFAULT_SERVERS = [ 'ecdsa.org:50001:t', 'electrum.novit.ro:50001:t', 'electrum.bitcoins.sk:50001:t']  # list of default servers
  27
  28
  29 def old_to_new(s):
  30     s = s.replace("'blk_hash'", "'block_hash'")
  31     s = s.replace("'pos'", "'index'")
  32     s = s.replace("'nTime'", "'timestamp'")
  33     s = s.replace("'is_in'", "'is_input'")
  34     s = s.replace("'raw_scriptPubKey'","'raw_output_script'")
  35     return s
  36
  37
  38 class Interface(threading.Thread):
  39     def __init__(self, host, port):
  40         threading.Thread.__init__(self)
  41         self.daemon = True
  42         self.host = host
  43         self.port = port
  44
  45         self.servers = [] # actual list from IRC
  46         self.rtime = 0
  47
  48         self.is_connected = True
  49         self.poll_interval = 1
  50
  51         #json
  52         self.message_id = 0
  53         self.responses = Queue.Queue()
  54         self.unanswered_requests = {}
  55
  56     def poke(self):
  57         # push a fake response so that the getting thread exits its loop
  58         self.responses.put(None)
  59
  60     def queue_json_response(self, c):
  61
  62         #print "<--",c
  63         msg_id = c.get('id')
  64         error = c.get('error')
  65
  66         if error:
  67             print "received error:", c
  68             return
  69
  70         if msg_id is not None:
  71             method, params = self.unanswered_requests.pop(msg_id)
  72             result = c.get('result')
  73         else:
  74             # notification
  75             method = c.get('method')
  76             params = c.get('params')
  77
  78             if method == 'blockchain.numblocks.subscribe':
  79                 result = params[0]
  80                 params = []
  81
  82             elif method == 'blockchain.address.subscribe':
  83                 addr = params[0]
  84                 result = params[1]
  85                 params = [addr]
  86
  87         self.responses.put({'method':method, 'params':params, 'result':result})
  88
  89
  90
  91     def subscribe(self, addresses):
  92         messages = []
  93         for addr in addresses:
  94             messages.append(('blockchain.address.subscribe', [addr]))
  95         self.send(messages)
  96
  97
  98
  99
 100 class PollingInterface(Interface):
 101     """ non-persistent connection. synchronous calls"""
 102
 103     def __init__(self, host, port):
 104         Interface.__init__(self, host, port)
 105         self.session_id = None
 106
 107     def get_history(self, address):
 108         self.send([('blockchain.address.get_history', [address] )])
 109
 110     def poll(self):
 111         pass
 112         #if is_new or wallet.remote_url:
 113         #    self.was_updated = True
 114         #    is_new = wallet.synchronize()
 115         #    wallet.update_tx_history()
 116         #    wallet.save()
 117         #    return is_new
 118         #else:
 119         #    return False
 120
 121     def run(self):
 122         self.is_connected = True
 123         while self.is_connected:
 124             try:
 125                 if self.session_id:
 126                     self.poll()
 127                 time.sleep(self.poll_interval)
 128             except socket.gaierror:
 129                 break
 130             except socket.error:
 131                 break
 132             except:
 133                 traceback.print_exc(file=sys.stdout)
 134                 break
 135
 136         self.is_connected = False
 137         self.poke()
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147 class HttpStratumInterface(PollingInterface):
 148
 149     def poll(self):
 150         self.send([])
 151
 152     def send(self, messages):
 153         import urllib2, json, time, cookielib
 154
 155         cj = cookielib.CookieJar()
 156         opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
 157         urllib2.install_opener(opener)
 158
 159         t1 = time.time()
 160
 161         data = []
 162         for m in messages:
 163             method, params = m
 164             if type(params) != type([]): params = [params]
 165             data.append( { 'method':method, 'id':self.message_id, 'params':params } )
 166             self.unanswered_requests[self.message_id] = method, params
 167             self.message_id += 1
 168
 169         if data:
 170             data_json = json.dumps(data)
 171         else:
 172             # poll with GET
 173             data_json = None
 174
 175         host = 'http://%s:%d'%( self.host, self.port )
 176         headers = {'content-type': 'application/json'}
 177         if self.session_id:
 178             headers['cookie'] = 'SESSION=%s'%self.session_id
 179
 180         req = urllib2.Request(host, data_json, headers)
 181         response_stream = urllib2.urlopen(req)
 182
 183         for index, cookie in enumerate(cj):
 184             if cookie.name=='SESSION':
 185                 self.session_id = cookie.value
 186
 187         response = response_stream.read()
 188         if response:
 189             response = json.loads( response )
 190             if type(response) is not type([]):
 191                 self.queue_json_response(response)
 192             else:
 193                 for item in response:
 194                     self.queue_json_response(item)
 195
 196         if response:
 197             self.poll_interval = 1
 198         else:
 199             if self.poll_interval < 15:
 200                 self.poll_interval += 1
 201         #print self.poll_interval, response
 202
 203         self.rtime = time.time() - t1
 204         self.is_connected = True
 205
 206
 207
 208
 209 class TcpStratumInterface(Interface):
 210     """json-rpc over persistent TCP connection, asynchronous"""
 211
 212     def __init__(self, host, port):
 213         Interface.__init__(self, host, port)
 214         self.s = socket.socket( socket.AF_INET, socket.SOCK_STREAM )
 215         self.s.settimeout(5*60)
 216         self.s.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
 217         try:
 218             self.s.connect(( self.host, self.port))
 219             self.is_connected = True
 220             self.send([('server.version', [ELECTRUM_VERSION])])
 221             print "Connected to %s:%d"%(self.host,self.port)
 222         except:
 223             self.is_connected = False
 224             print "Not connected"
 225
 226     def run(self):
 227         try:
 228             out = ''
 229             while self.is_connected:
 230                 try: msg = self.s.recv(1024)
 231                 except socket.timeout:
 232                     # ping the server with server.version, as a real ping does not exist yet
 233                     self.send([('server.version', [ELECTRUM_VERSION])])
 234                     continue
 235                 out += msg
 236                 if msg == '':
 237                     self.is_connected = False
 238                     print "disconnected."
 239
 240                 while True:
 241                     s = out.find('\n')
 242                     if s==-1: break
 243                     c = out[0:s]
 244                     out = out[s+1:]
 245                     c = json.loads(c)
 246                     self.queue_json_response(c)
 247
 248         except:
 249             traceback.print_exc(file=sys.stdout)
 250
 251         self.is_connected = False
 252         print "poking"
 253         self.poke()
 254
 255     def send(self, messages):
 256         out = ''
 257         for m in messages:
 258             method, params = m
 259             request = json.dumps( { 'id':self.message_id, 'method':method, 'params':params } )
 260             self.unanswered_requests[self.message_id] = method, params
 261             #print "-->",request
 262             self.message_id += 1
 263             out += request + '\n'
 264         self.s.send( out )
 265
 266     def get_history(self, addr):
 267         self.send([('blockchain.address.get_history', [addr])])
 268
 269
 270
 271
 272
 273 class WalletSynchronizer(threading.Thread):
 274
 275     def __init__(self, wallet, loop=False):
 276         threading.Thread.__init__(self)
 277         self.daemon = True
 278         self.wallet = wallet
 279         self.loop = loop
 280         self.start_interface()
 281
 282
 283     def handle_response(self, r):
 284         if r is None:
 285             return
 286
 287         method = r['method']
 288         params = r['params']
 289         result = r['result']
 290
 291         if method == 'server.banner':
 292             self.wallet.banner = result
 293             self.wallet.was_updated = True
 294
 295         elif method == 'server.peers.subscribe':
 296             servers = []
 297             for item in result:
 298                 s = []
 299                 host = item[1]
 300                 ports = []
 301                 if len(item)>2:
 302                     for v in item[2]:
 303                         if re.match("[th]\d+",v):
 304                             ports.append((v[0],v[1:]))
 305                 if ports:
 306                     servers.append( (host, ports) )
 307             self.interface.servers = servers
 308
 309         elif method == 'blockchain.address.subscribe':
 310             addr = params[0]
 311             self.wallet.receive_status_callback(addr, result)
 312
 313         elif method == 'blockchain.address.get_history':
 314             addr = params[0]
 315             self.wallet.receive_history_callback(addr, result)
 316             self.wallet.was_updated = True
 317
 318         elif method == 'blockchain.transaction.broadcast':
 319             self.wallet.tx_result = result
 320             self.wallet.tx_event.set()
 321
 322         elif method == 'blockchain.numblocks.subscribe':
 323             self.wallet.blocks = result
 324
 325         elif method == 'server.version':
 326             pass
 327
 328         else:
 329             print "unknown message:", method, params, result
 330
 331
 332     def start_interface(self):
 333         try:
 334             host, port, protocol = self.wallet.server.split(':')
 335             port = int(port)
 336         except:
 337             self.wallet.pick_random_server()
 338             host, port, protocol = self.wallet.server.split(':')
 339             port = int(port)
 340
 341         #print protocol, host, port
 342         if protocol == 't':
 343             InterfaceClass = TcpStratumInterface
 344         elif protocol == 'h':
 345             InterfaceClass = HttpStratumInterface
 346         else:
 347             print "unknown protocol"
 348             InterfaceClass = TcpStratumInterface
 349
 350         self.interface = InterfaceClass(host, port)
 351         self.interface.start()
 352         self.wallet.interface = self.interface
 353
 354         if self.interface.is_connected:
 355             self.wallet.start_session(self.interface)
 356
 357
 358
 359     def run(self):
 360         import socket, time
 361         while True:
 362             while self.interface.is_connected:
 363                 new_addresses = self.wallet.synchronize()
 364                 if new_addresses:
 365                     self.interface.subscribe(new_addresses)
 366
 367                 if self.wallet.is_up_to_date():
 368                     if not self.wallet.up_to_date:
 369                         self.wallet.up_to_date = True
 370                         self.wallet.was_updated = True
 371                         self.wallet.up_to_date_event.set()
 372                 else:
 373                     if self.wallet.up_to_date:
 374                         self.wallet.up_to_date = False
 375                         self.wallet.was_updated = True
 376
 377                 if self.wallet.was_updated:
 378                     self.wallet.gui_callback()
 379                     self.wallet.was_updated = False
 380
 381                 response = self.interface.responses.get()
 382                 self.handle_response(response)
 383
 384             self.wallet.gui_callback()
 385             if self.loop:
 386                 time.sleep(5)
 387                 self.start_interface()
 388                 continue
 389             else:
 390                 break
 391
 392
 393