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         self.pending_transactions_for_notifications = []
 115
 116
 117     def is_connected(self):
 118         return self.interface and self.interface.is_connected
 119
 120
 121     def is_up_to_date(self):
 122         return self.interface.is_up_to_date()
 123
 124
 125     def main_server(self):
 126         return self.interface.server
 127
 128
 129     def send_subscriptions(self):
 130         for cb, sub in self.subscriptions.items():
 131             self.interface.send(sub, cb)
 132
 133
 134     def subscribe(self, messages, callback):
 135         with self.lock:
 136             if self.subscriptions.get(callback) is None:
 137                 self.subscriptions[callback] = []
 138             for message in messages:
 139                 if message not in self.subscriptions[callback]:
 140                     self.subscriptions[callback].append(message)
 141
 142         if self.is_connected():
 143             self.interface.send( messages, callback )
 144
 145
 146     def send(self, messages, callback):
 147         if self.is_connected():
 148             self.interface.send( messages, callback )
 149             return True
 150         else:
 151             return False
 152
 153
 154     def register_callback(self, event, callback):
 155         with self.lock:
 156             if not self.callbacks.get(event):
 157                 self.callbacks[event] = []
 158             self.callbacks[event].append(callback)
 159
 160
 161     def trigger_callback(self, event):
 162         with self.lock:
 163             callbacks = self.callbacks.get(event,[])[:]
 164         if callbacks:
 165             [callback() for callback in callbacks]
 166
 167
 168     def random_server(self):
 169         choice_list = []
 170         l = filter_protocol(self.get_servers(), self.protocol)
 171         for s in l:
 172             if s in self.pending_servers or s in self.disconnected_servers or s in self.interfaces.keys():
 173                 continue
 174             else:
 175                 choice_list.append(s)
 176
 177         if not choice_list:
 178             if not self.interfaces:
 179                 # we are probably offline, retry later
 180                 self.disconnected_servers = set([])
 181             return
 182
 183         server = random.choice( choice_list )
 184         return server
 185
 186
 187     def get_servers(self):
 188         if self.irc_servers:
 189             out = self.irc_servers
 190         else:
 191             out = DEFAULT_SERVERS
 192             for s in self.recent_servers:
 193                 host, port, protocol = s.split(':')
 194                 if host not in out:
 195                     out[host] = { protocol:port }
 196         return out
 197
 198     def start_interface(self, server):
 199         if server in self.interfaces.keys():
 200             return
 201         i = interface.Interface(server, self.config)
 202         self.pending_servers.add(server)
 203         i.start(self.queue)
 204         return i
 205
 206     def start_random_interface(self):
 207         server = self.random_server()
 208         if server:
 209             self.start_interface(server)
 210
 211     def start_interfaces(self):
 212         self.interface = self.start_interface(self.default_server)
 213
 214         for i in range(self.num_server):
 215             self.start_random_interface()
 216
 217
 218     def start(self, wait=False):
 219         self.start_interfaces()
 220         threading.Thread.start(self)
 221         if wait:
 222             return self.wait_until_connected()
 223
 224     def wait_until_connected(self):
 225         "wait until connection status is known"
 226         if self.config.get('auto_cycle'):
 227             # self.random_server() returns None if all servers have been tried
 228             while not self.is_connected() and self.random_server():
 229                 time.sleep(0.1)
 230         else:
 231             self.interface.connect_event.wait()
 232
 233         return self.interface.is_connected
 234
 235
 236     def set_parameters(self, host, port, protocol, proxy, auto_connect):
 237
 238         self.config.set_key('auto_cycle', auto_connect, True)
 239         self.config.set_key("proxy", proxy, True)
 240         self.config.set_key("protocol", protocol, True)
 241         server = ':'.join([ host, port, protocol ])
 242         self.config.set_key("server", server, True)
 243
 244         if self.proxy != proxy or self.protocol != protocol:
 245             self.proxy = proxy
 246             self.protocol = protocol
 247             for i in self.interfaces.values(): i.stop()
 248             if auto_connect:
 249                 #self.interface = None
 250                 return
 251
 252         if auto_connect:
 253             if not self.interface.is_connected:
 254                 self.switch_to_random_interface()
 255             else:
 256                 if self.server_lag > 0:
 257                     self.stop_interface()
 258         else:
 259             self.set_server(server)
 260
 261
 262     def switch_to_random_interface(self):
 263         if self.interfaces:
 264             self.switch_to_interface(random.choice(self.interfaces.values()))
 265
 266     def switch_to_interface(self, interface):
 267         assert not self.interface.is_connected
 268         server = interface.server
 269         print_error("switching to", server)
 270         self.interface = interface
 271         h =  self.heights.get(server)
 272         if h:
 273             self.server_lag = self.blockchain.height() - h
 274         self.config.set_key('server', server, False)
 275         self.default_server = server
 276         self.send_subscriptions()
 277         self.trigger_callback('connected')
 278
 279
 280     def stop_interface(self):
 281         self.interface.stop()
 282
 283
 284     def set_server(self, server):
 285         if self.default_server == server and self.interface.is_connected:
 286             return
 287
 288         if self.protocol != server.split(':')[2]:
 289             return
 290
 291         # stop the interface in order to terminate subscriptions
 292         if self.interface.is_connected:
 293             self.stop_interface()
 294
 295         # notify gui
 296         self.trigger_callback('disconnecting')
 297         # start interface
 298         self.default_server = server
 299         self.config.set_key("server", server, True)
 300
 301         if server in self.interfaces.keys():
 302             self.switch_to_interface( self.interfaces[server] )
 303         else:
 304             self.interface = self.start_interface(server)
 305
 306
 307     def add_recent_server(self, i):
 308         # list is ordered
 309         s = i.server
 310         if s in self.recent_servers:
 311             self.recent_servers.remove(s)
 312         self.recent_servers.insert(0,s)
 313         self.recent_servers = self.recent_servers[0:20]
 314         self.config.set_key('recent_servers', self.recent_servers)
 315
 316
 317     def new_blockchain_height(self, blockchain_height, i):
 318         if self.is_connected():
 319             h = self.heights.get(self.interface.server)
 320             if h:
 321                 self.server_lag = blockchain_height - h
 322                 if self.server_lag > 1:
 323                     print_error( "Server is lagging", blockchain_height, h)
 324                     if self.config.get('auto_cycle'):
 325                         self.set_server(i.server)
 326             else:
 327                 print_error('no height for main interface')
 328
 329         self.trigger_callback('updated')
 330
 331
 332     def run(self):
 333         self.blockchain.start()
 334
 335         with self.lock:
 336             self.running = True
 337
 338         while self.is_running():
 339             try:
 340                 i = self.queue.get(timeout = 30 if self.interfaces else 3)
 341             except Queue.Empty:
 342                 if len(self.interfaces) < self.num_server:
 343                     self.start_random_interface()
 344                 continue
 345
 346             if i.server in self.pending_servers:
 347                 self.pending_servers.remove(i.server)
 348
 349             if i.is_connected:
 350                 #if i.server in self.interfaces: raise
 351                 self.interfaces[i.server] = i
 352                 self.add_recent_server(i)
 353                 i.send([ ('blockchain.headers.subscribe',[])], self.on_header)
 354                 if i == self.interface:
 355                     print_error('sending subscriptions to', self.interface.server)
 356                     self.send_subscriptions()
 357                     self.trigger_callback('connected')
 358             else:
 359                 self.disconnected_servers.add(i.server)
 360                 if i.server in self.interfaces:
 361                     self.interfaces.pop(i.server)
 362                 if i.server in self.heights:
 363                     self.heights.pop(i.server)
 364                 if i == self.interface:
 365                     #self.interface = None
 366                     self.trigger_callback('disconnected')
 367
 368             if not self.interface.is_connected and self.config.get('auto_cycle'):
 369                 self.switch_to_random_interface()
 370
 371
 372     def on_header(self, i, r):
 373         result = r.get('result')
 374         if not result:
 375             return
 376         height = result.get('block_height')
 377         if not height:
 378             return
 379         self.heights[i.server] = height
 380         self.merkle_roots[i.server] = result.get('merkle_root')
 381         self.utxo_roots[i.server] = result.get('utxo_root')
 382         # notify blockchain about the new height
 383         self.blockchain.queue.put((i,result))
 384
 385         if i == self.interface:
 386             self.server_lag = self.blockchain.height() - height
 387             if self.server_lag > 1 and self.config.get('auto_cycle'):
 388                 print_error( "Server lagging, stopping interface")
 389                 self.stop_interface()
 390
 391             self.trigger_callback('updated')
 392
 393
 394     def on_peers(self, i, r):
 395         if not r: return
 396         self.irc_servers = parse_servers(r.get('result'))
 397         self.trigger_callback('peers')
 398
 399     def on_banner(self, i, r):
 400         self.banner = r.get('result')
 401         self.trigger_callback('banner')
 402
 403     def stop(self):
 404         with self.lock: self.running = False
 405
 406     def is_running(self):
 407         with self.lock: return self.running
 408
 409
 410     def synchronous_get(self, requests, timeout=100000000):
 411         return self.interface.synchronous_get(requests)
 412
 413
 414     def get_header(self, tx_height):
 415         return self.blockchain.read_header(tx_height)
 416
 417     def get_local_height(self):
 418         return self.blockchain.height()
 419
 420
 421
 422     #def retrieve_transaction(self, tx_hash, tx_height=0):
 423     #    import transaction
 424     #    r = self.synchronous_get([ ('blockchain.transaction.get',[tx_hash, tx_height]) ])[0]
 425     #    if r:
 426     #        return transaction.Transaction(r)
 427
 428
 429
 430
 431
 432 if __name__ == "__main__":
 433     network = NetworkProxy({})
 434     network.start()
 435     print network.get_servers()
 436
 437     q = Queue.Queue()
 438     network.send([('blockchain.headers.subscribe',[])], q.put)
 439     while True:
 440         r = q.get(timeout=10000)
 441         print r
 442