lib/network.py

   1 import threading, time, Queue, os, sys, shutil, random
   2 from util import user_dir, appdata_dir, print_error, print_msg
   3 from bitcoin import *
   4 import interface
   5 from blockchain import Blockchain
   6
   7 DEFAULT_PORTS = {'t':'50001', 's':'50002', 'h':'8081', 'g':'8082'}
   8
   9 DEFAULT_SERVERS = {
  10     'ecdsa.org': DEFAULT_PORTS,
  11     'ecdsa.net': DEFAULT_PORTS,
  12     'electrum.hachre.de': DEFAULT_PORTS,
  13     'electrum.novit.ro': DEFAULT_PORTS,
  14     'electrum.coinwallet.me': DEFAULT_PORTS,
  15     'cube.l0g.in': DEFAULT_PORTS,
  16     'bitcoin.epicinet.net': DEFAULT_PORTS,
  17     'h.1209k.com': DEFAULT_PORTS,
  18     'electrum.electricnewyear.net': DEFAULT_PORTS,
  19     'erbium.sytes.net': DEFAULT_PORTS,
  20     'e2.pdmc.net':DEFAULT_PORTS,
  21     'electrum.no-ip.org':{'h': '80', 's': '50002', 't': '50001', 'g': '443'},
  22     'electrum.thwg.org':DEFAULT_PORTS,
  23     'electrum.stepkrav.pw':DEFAULT_PORTS,
  24 }
  25
  26
  27 def parse_servers(result):
  28     """ parse servers list into dict format"""
  29     from version import PROTOCOL_VERSION
  30     servers = {}
  31     for item in result:
  32         host = item[1]
  33         out = {}
  34         version = None
  35         pruning_level = '-'
  36         if len(item) > 2:
  37             for v in item[2]:
  38                 if re.match("[stgh]\d*", v):
  39                     protocol, port = v[0], v[1:]
  40                     if port == '': port = DEFAULT_PORTS[protocol]
  41                     out[protocol] = port
  42                 elif re.match("v(.?)+", v):
  43                     version = v[1:]
  44                 elif re.match("p\d*", v):
  45                     pruning_level = v[1:]
  46                 if pruning_level == '': pruning_level = '0'
  47         try:
  48             is_recent = float(version)>=float(PROTOCOL_VERSION)
  49         except Exception:
  50             is_recent = False
  51
  52         if out and is_recent:
  53             out['pruning'] = pruning_level
  54             servers[host] = out
  55
  56     return servers
  57
  58
  59
  60 def filter_protocol(servers, p):
  61     l = []
  62     for k, protocols in servers.items():
  63         if p in protocols:
  64             l.append( ':'.join([k, protocols[p], p]) )
  65     return l
  66
  67
  68 def pick_random_server(p='s'):
  69     return random.choice( filter_protocol(DEFAULT_SERVERS,p) )
  70
  71 from simple_config import SimpleConfig
  72
  73 class Network(threading.Thread):
  74
  75     def __init__(self, config = {}):
  76         threading.Thread.__init__(self)
  77         self.daemon = True
  78         self.config = SimpleConfig(config) if type(config) == type({}) else config
  79         self.lock = threading.Lock()
  80         self.num_server = 8 if not self.config.get('oneserver') else 0
  81         self.blockchain = Blockchain(self.config, self)
  82         self.interfaces = {}
  83         self.queue = Queue.Queue()
  84         self.callbacks = {}
  85         self.protocol = self.config.get('protocol','s')
  86         self.running = False
  87
  88         # Server for addresses and transactions
  89         self.default_server = self.config.get('server')
  90         if not self.default_server:
  91             self.default_server = pick_random_server(self.protocol)
  92
  93         self.irc_servers = [] # returned by interface (list from irc)
  94         self.pending_servers = set([])
  95         self.disconnected_servers = set([])
  96         self.recent_servers = self.config.get('recent_servers',[]) # successful connections
  97
  98         self.banner = ''
  99         self.interface = None
 100         self.proxy = self.config.get('proxy')
 101         self.heights = {}
 102         self.merkle_roots = {}
 103         self.utxo_roots = {}
 104         self.server_lag = 0
 105
 106         dir_path = os.path.join( self.config.path, 'certs')
 107         if not os.path.exists(dir_path):
 108             os.mkdir(dir_path)
 109
 110         # default subscriptions
 111         self.subscriptions = {}
 112         self.subscriptions[self.on_banner] = [('server.banner',[])]
 113         self.subscriptions[self.on_peers] = [('server.peers.subscribe',[])]
 114
 115
 116     def is_connected(self):
 117         return self.interface and self.interface.is_connected
 118
 119
 120     def is_up_to_date(self):
 121         return self.interface.is_up_to_date()
 122
 123
 124     def main_server(self):
 125         return self.interface.server
 126
 127
 128     def send_subscriptions(self):
 129         for cb, sub in self.subscriptions.items():
 130             self.interface.send(sub, cb)
 131
 132
 133     def subscribe(self, messages, callback):
 134         with self.lock:
 135             if self.subscriptions.get(callback) is None:
 136                 self.subscriptions[callback] = []
 137             for message in messages:
 138                 if message not in self.subscriptions[callback]:
 139                     self.subscriptions[callback].append(message)
 140
 141         if self.is_connected():
 142             self.interface.send( messages, callback )
 143
 144
 145     def send(self, messages, callback):
 146         if self.is_connected():
 147             self.interface.send( messages, callback )
 148             return True
 149         else:
 150             return False
 151
 152
 153     def register_callback(self, event, callback):
 154         with self.lock:
 155             if not self.callbacks.get(event):
 156                 self.callbacks[event] = []
 157             self.callbacks[event].append(callback)
 158
 159
 160     def trigger_callback(self, event):
 161         with self.lock:
 162             callbacks = self.callbacks.get(event,[])[:]
 163         if callbacks:
 164             [callback() for callback in callbacks]
 165
 166
 167     def random_server(self):
 168         choice_list = []
 169         l = filter_protocol(self.get_servers(), self.protocol)
 170         for s in l:
 171             if s in self.pending_servers or s in self.disconnected_servers or s in self.interfaces.keys():
 172                 continue
 173             else:
 174                 choice_list.append(s)
 175
 176         if not choice_list:
 177             if not self.interfaces:
 178                 # we are probably offline, retry later
 179                 self.disconnected_servers = set([])
 180             return
 181
 182         server = random.choice( choice_list )
 183         return server
 184
 185
 186     def get_servers(self):
 187         if self.irc_servers:
 188             out = self.irc_servers
 189         else:
 190             out = DEFAULT_SERVERS
 191             for s in self.recent_servers:
 192                 host, port, protocol = s.split(':')
 193                 if host not in out:
 194                     out[host] = { protocol:port }
 195         return out
 196
 197     def start_interface(self, server):
 198         if server in self.interfaces.keys():
 199             return
 200         i = interface.Interface(server, self.config)
 201         self.pending_servers.add(server)
 202         i.start(self.queue)
 203         return i
 204
 205     def start_random_interface(self):
 206         server = self.random_server()
 207         if server:
 208             self.start_interface(server)
 209
 210     def start_interfaces(self):
 211         self.interface = self.start_interface(self.default_server)
 212
 213         for i in range(self.num_server):
 214             self.start_random_interface()
 215
 216
 217     def start(self, wait=False):
 218         self.start_interfaces()
 219         threading.Thread.start(self)
 220         if wait:
 221             return self.wait_until_connected()
 222
 223     def wait_until_connected(self):
 224         "wait until connection status is known"
 225         if self.config.get('auto_cycle'):
 226             # self.random_server() returns None if all servers have been tried
 227             while not self.is_connected() and self.random_server():
 228                 time.sleep(0.1)
 229         else:
 230             self.interface.connect_event.wait()
 231
 232         return self.interface.is_connected
 233
 234
 235     def set_parameters(self, host, port, protocol, proxy, auto_connect):
 236
 237         self.config.set_key('auto_cycle', auto_connect, True)
 238         self.config.set_key("proxy", proxy, True)
 239         self.config.set_key("protocol", protocol, True)
 240         server = ':'.join([ host, port, protocol ])
 241         self.config.set_key("server", server, True)
 242
 243         if self.proxy != proxy or self.protocol != protocol:
 244             self.proxy = proxy
 245             self.protocol = protocol
 246             for i in self.interfaces.values(): i.stop()
 247             if auto_connect:
 248                 #self.interface = None
 249                 return
 250
 251         if auto_connect:
 252             if not self.interface.is_connected:
 253                 self.switch_to_random_interface()
 254             else:
 255                 if self.server_lag > 0:
 256                     self.stop_interface()
 257         else:
 258             self.set_server(server)
 259
 260
 261     def switch_to_random_interface(self):
 262         if self.interfaces:
 263             self.switch_to_interface(random.choice(self.interfaces.values()))
 264
 265     def switch_to_interface(self, interface):
 266         assert not self.interface.is_connected
 267         server = interface.server
 268         print_error("switching to", server)
 269         self.interface = interface
 270         h =  self.heights.get(server)
 271         if h:
 272             self.server_lag = self.blockchain.height() - h
 273         self.config.set_key('server', server, False)
 274         self.default_server = server
 275         self.send_subscriptions()
 276         self.trigger_callback('connected')
 277
 278
 279     def stop_interface(self):
 280         self.interface.stop()
 281
 282
 283     def set_server(self, server):
 284         if self.default_server == server and self.interface.is_connected:
 285             return
 286
 287         if self.protocol != server.split(':')[2]:
 288             return
 289
 290         # stop the interface in order to terminate subscriptions
 291         if self.interface.is_connected:
 292             self.stop_interface()
 293
 294         # notify gui
 295         self.trigger_callback('disconnecting')
 296         # start interface
 297         self.default_server = server
 298         self.config.set_key("server", server, True)
 299
 300         if server in self.interfaces.keys():
 301             self.switch_to_interface( self.interfaces[server] )
 302         else:
 303             self.interface = self.start_interface(server)
 304
 305
 306     def add_recent_server(self, i):
 307         # list is ordered
 308         s = i.server
 309         if s in self.recent_servers:
 310             self.recent_servers.remove(s)
 311         self.recent_servers.insert(0,s)
 312         self.recent_servers = self.recent_servers[0:20]
 313         self.config.set_key('recent_servers', self.recent_servers)
 314
 315
 316     def new_blockchain_height(self, blockchain_height, i):
 317         if self.is_connected():
 318             h = self.heights.get(self.interface.server)
 319             if h:
 320                 self.server_lag = blockchain_height - h
 321                 if self.server_lag > 1:
 322                     print_error( "Server is lagging", blockchain_height, h)
 323                     if self.config.get('auto_cycle'):
 324                         self.set_server(i.server)
 325             else:
 326                 print_error('no height for main interface')
 327
 328         self.trigger_callback('updated')
 329
 330
 331     def run(self):
 332         self.blockchain.start()
 333
 334         with self.lock:
 335             self.running = True
 336
 337         while self.is_running():
 338             try:
 339                 i = self.queue.get(timeout = 30 if self.interfaces else 3)
 340             except Queue.Empty:
 341                 if len(self.interfaces) < self.num_server:
 342                     self.start_random_interface()
 343                 continue
 344
 345             if i.server in self.pending_servers:
 346                 self.pending_servers.remove(i.server)
 347
 348             if i.is_connected:
 349                 #if i.server in self.interfaces: raise
 350                 self.interfaces[i.server] = i
 351                 self.add_recent_server(i)
 352                 i.send([ ('blockchain.headers.subscribe',[])], self.on_header)
 353                 if i == self.interface:
 354                     print_error('sending subscriptions to', self.interface.server)
 355                     self.send_subscriptions()
 356                     self.trigger_callback('connected')
 357             else:
 358                 self.disconnected_servers.add(i.server)
 359                 if i.server in self.interfaces:
 360                     self.interfaces.pop(i.server)
 361                 if i.server in self.heights:
 362                     self.heights.pop(i.server)
 363                 if i == self.interface:
 364                     #self.interface = None
 365                     self.trigger_callback('disconnected')
 366
 367             if not self.interface.is_connected and self.config.get('auto_cycle'):
 368                 self.switch_to_random_interface()
 369
 370
 371     def on_header(self, i, r):
 372         result = r.get('result')
 373         if not result: return
 374         height = result.get('block_height')
 375         self.heights[i.server] = height
 376         self.merkle_roots[i.server] = result.get('merkle_root')
 377         self.utxo_roots[i.server] = result.get('utxo_root')
 378         # notify blockchain about the new height
 379         self.blockchain.queue.put((i,result))
 380
 381         if i == self.interface:
 382             self.server_lag = self.blockchain.height() - height
 383             if self.server_lag > 1 and self.config.get('auto_cycle'):
 384                 print_error( "Server lagging, stopping interface")
 385                 self.stop_interface()
 386
 387             self.trigger_callback('updated')
 388
 389
 390     def on_peers(self, i, r):
 391         if not r: return
 392         self.irc_servers = parse_servers(r.get('result'))
 393         self.trigger_callback('peers')
 394
 395     def on_banner(self, i, r):
 396         self.banner = r.get('result')
 397         self.trigger_callback('banner')
 398
 399     def stop(self):
 400         with self.lock: self.running = False
 401
 402     def is_running(self):
 403         with self.lock: return self.running
 404
 405
 406     def synchronous_get(self, requests, timeout=100000000):
 407         return self.interface.synchronous_get(requests)
 408
 409
 410     def get_header(self, tx_height):
 411         return self.blockchain.read_header(tx_height)
 412
 413     def get_local_height(self):
 414         return self.blockchain.height()
 415
 416
 417
 418     #def retrieve_transaction(self, tx_hash, tx_height=0):
 419     #    import transaction
 420     #    r = self.synchronous_get([ ('blockchain.transaction.get',[tx_hash, tx_height]) ])[0]
 421     #    if r:
 422     #        return transaction.Transaction(r)
 423
 424
 425
 426
 427
 428 if __name__ == "__main__":
 429     network = NetworkProxy({})
 430     network.start()
 431     print network.get_servers()
 432
 433     q = Queue.Queue()
 434     network.send([('blockchain.headers.subscribe',[])], q.put)
 435     while True:
 436         r = q.get(timeout=10000)
 437         print r
 438