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=None):
  76         if config is None:
  77             config = {}  # Do not use mutables as default values!
  78         threading.Thread.__init__(self)
  79         self.daemon = True
  80         self.config = SimpleConfig(config) if type(config) == type({}) else config
  81         self.lock = threading.Lock()
  82         self.num_server = 8 if not self.config.get('oneserver') else 0
  83         self.blockchain = Blockchain(self.config, self)
  84         self.interfaces = {}
  85         self.queue = Queue.Queue()
  86         self.callbacks = {}
  87         self.protocol = self.config.get('protocol','s')
  88         self.running = False
  89
  90         # Server for addresses and transactions
  91         self.default_server = self.config.get('server')
  92         if not self.default_server:
  93             self.default_server = pick_random_server(self.protocol)
  94
  95         self.irc_servers = [] # returned by interface (list from irc)
  96         self.pending_servers = set([])
  97         self.disconnected_servers = set([])
  98         self.recent_servers = self.config.get('recent_servers',[]) # successful connections
  99
 100         self.banner = ''
 101         self.interface = None
 102         self.proxy = self.config.get('proxy')
 103         self.heights = {}
 104         self.merkle_roots = {}
 105         self.utxo_roots = {}
 106         self.server_lag = 0
 107
 108         dir_path = os.path.join( self.config.path, 'certs')
 109         if not os.path.exists(dir_path):
 110             os.mkdir(dir_path)
 111
 112         # default subscriptions
 113         self.subscriptions = {}
 114         self.subscriptions[self.on_banner] = [('server.banner',[])]
 115         self.subscriptions[self.on_peers] = [('server.peers.subscribe',[])]
 116         self.pending_transactions_for_notifications = []
 117
 118
 119     def is_connected(self):
 120         return self.interface and self.interface.is_connected
 121
 122
 123     def is_up_to_date(self):
 124         return self.interface.is_up_to_date()
 125
 126
 127     def main_server(self):
 128         return self.interface.server
 129
 130
 131     def send_subscriptions(self):
 132         for cb, sub in self.subscriptions.items():
 133             self.interface.send(sub, cb)
 134
 135
 136     def subscribe(self, messages, callback):
 137         with self.lock:
 138             if self.subscriptions.get(callback) is None:
 139                 self.subscriptions[callback] = []
 140             for message in messages:
 141                 if message not in self.subscriptions[callback]:
 142                     self.subscriptions[callback].append(message)
 143
 144         if self.is_connected():
 145             self.interface.send( messages, callback )
 146
 147
 148     def send(self, messages, callback):
 149         if self.is_connected():
 150             self.interface.send( messages, callback )
 151             return True
 152         else:
 153             return False
 154
 155
 156     def register_callback(self, event, callback):
 157         with self.lock:
 158             if not self.callbacks.get(event):
 159                 self.callbacks[event] = []
 160             self.callbacks[event].append(callback)
 161
 162
 163     def trigger_callback(self, event):
 164         with self.lock:
 165             callbacks = self.callbacks.get(event,[])[:]
 166         if callbacks:
 167             [callback() for callback in callbacks]
 168
 169
 170     def random_server(self):
 171         choice_list = []
 172         l = filter_protocol(self.get_servers(), self.protocol)
 173         for s in l:
 174             if s in self.pending_servers or s in self.disconnected_servers or s in self.interfaces.keys():
 175                 continue
 176             else:
 177                 choice_list.append(s)
 178
 179         if not choice_list:
 180             if not self.interfaces:
 181                 # we are probably offline, retry later
 182                 self.disconnected_servers = set([])
 183             return
 184
 185         server = random.choice( choice_list )
 186         return server
 187
 188
 189     def get_servers(self):
 190         if self.irc_servers:
 191             out = self.irc_servers
 192         else:
 193             out = DEFAULT_SERVERS
 194             for s in self.recent_servers:
 195                 host, port, protocol = s.split(':')
 196                 if host not in out:
 197                     out[host] = { protocol:port }
 198         return out
 199
 200     def start_interface(self, server):
 201         if server in self.interfaces.keys():
 202             return
 203         i = interface.Interface(server, self.config)
 204         self.pending_servers.add(server)
 205         i.start(self.queue)
 206         return i
 207
 208     def start_random_interface(self):
 209         server = self.random_server()
 210         if server:
 211             self.start_interface(server)
 212
 213     def start_interfaces(self):
 214         self.interface = self.start_interface(self.default_server)
 215
 216         for i in range(self.num_server):
 217             self.start_random_interface()
 218
 219
 220     def start(self, wait=False):
 221         self.start_interfaces()
 222         threading.Thread.start(self)
 223         if wait:
 224             return self.wait_until_connected()
 225
 226     def wait_until_connected(self):
 227         "wait until connection status is known"
 228         if self.config.get('auto_cycle'):
 229             # self.random_server() returns None if all servers have been tried
 230             while not self.is_connected() and self.random_server():
 231                 time.sleep(0.1)
 232         else:
 233             self.interface.connect_event.wait()
 234
 235         return self.interface.is_connected
 236
 237
 238     def set_parameters(self, host, port, protocol, proxy, auto_connect):
 239
 240         self.config.set_key('auto_cycle', auto_connect, True)
 241         self.config.set_key("proxy", proxy, True)
 242         self.config.set_key("protocol", protocol, True)
 243         server = ':'.join([ host, port, protocol ])
 244         self.config.set_key("server", server, True)
 245
 246         if self.proxy != proxy or self.protocol != protocol:
 247             self.proxy = proxy
 248             self.protocol = protocol
 249             for i in self.interfaces.values(): i.stop()
 250             if auto_connect:
 251                 #self.interface = None
 252                 return
 253
 254         if auto_connect:
 255             if not self.interface.is_connected:
 256                 self.switch_to_random_interface()
 257             else:
 258                 if self.server_lag > 0:
 259                     self.stop_interface()
 260         else:
 261             self.set_server(server)
 262
 263
 264     def switch_to_random_interface(self):
 265         if self.interfaces:
 266             self.switch_to_interface(random.choice(self.interfaces.values()))
 267
 268     def switch_to_interface(self, interface):
 269         assert not self.interface.is_connected
 270         server = interface.server
 271         print_error("switching to", server)
 272         self.interface = interface
 273         h =  self.heights.get(server)
 274         if h:
 275             self.server_lag = self.blockchain.height() - h
 276         self.config.set_key('server', server, False)
 277         self.default_server = server
 278         self.send_subscriptions()
 279         self.trigger_callback('connected')
 280
 281
 282     def stop_interface(self):
 283         self.interface.stop()
 284
 285
 286     def set_server(self, server):
 287         if self.default_server == server and self.interface.is_connected:
 288             return
 289
 290         if self.protocol != server.split(':')[2]:
 291             return
 292
 293         # stop the interface in order to terminate subscriptions
 294         if self.interface.is_connected:
 295             self.stop_interface()
 296
 297         # notify gui
 298         self.trigger_callback('disconnecting')
 299         # start interface
 300         self.default_server = server
 301         self.config.set_key("server", server, True)
 302
 303         if server in self.interfaces.keys():
 304             self.switch_to_interface( self.interfaces[server] )
 305         else:
 306             self.interface = self.start_interface(server)
 307
 308
 309     def add_recent_server(self, i):
 310         # list is ordered
 311         s = i.server
 312         if s in self.recent_servers:
 313             self.recent_servers.remove(s)
 314         self.recent_servers.insert(0,s)
 315         self.recent_servers = self.recent_servers[0:20]
 316         self.config.set_key('recent_servers', self.recent_servers)
 317
 318
 319     def new_blockchain_height(self, blockchain_height, i):
 320         if self.is_connected():
 321             h = self.heights.get(self.interface.server)
 322             if h:
 323                 self.server_lag = blockchain_height - h
 324                 if self.server_lag > 1:
 325                     print_error( "Server is lagging", blockchain_height, h)
 326                     if self.config.get('auto_cycle'):
 327                         self.set_server(i.server)
 328             else:
 329                 print_error('no height for main interface')
 330
 331         self.trigger_callback('updated')
 332
 333
 334     def run(self):
 335         self.blockchain.start()
 336
 337         with self.lock:
 338             self.running = True
 339
 340         while self.is_running():
 341             try:
 342                 i = self.queue.get(timeout = 30 if self.interfaces else 3)
 343             except Queue.Empty:
 344                 if len(self.interfaces) < self.num_server:
 345                     self.start_random_interface()
 346                 continue
 347
 348             if i.server in self.pending_servers:
 349                 self.pending_servers.remove(i.server)
 350
 351             if i.is_connected:
 352                 #if i.server in self.interfaces: raise
 353                 self.interfaces[i.server] = i
 354                 self.add_recent_server(i)
 355                 i.send([ ('blockchain.headers.subscribe',[])], self.on_header)
 356                 if i == self.interface:
 357                     print_error('sending subscriptions to', self.interface.server)
 358                     self.send_subscriptions()
 359                     self.trigger_callback('connected')
 360             else:
 361                 self.disconnected_servers.add(i.server)
 362                 if i.server in self.interfaces:
 363                     self.interfaces.pop(i.server)
 364                 if i.server in self.heights:
 365                     self.heights.pop(i.server)
 366                 if i == self.interface:
 367                     #self.interface = None
 368                     self.trigger_callback('disconnected')
 369
 370             if not self.interface.is_connected and self.config.get('auto_cycle'):
 371                 self.switch_to_random_interface()
 372
 373
 374     def on_header(self, i, r):
 375         result = r.get('result')
 376         if not result:
 377             return
 378         height = result.get('block_height')
 379         if not height:
 380             return
 381         self.heights[i.server] = height
 382         self.merkle_roots[i.server] = result.get('merkle_root')
 383         self.utxo_roots[i.server] = result.get('utxo_root')
 384         # notify blockchain about the new height
 385         self.blockchain.queue.put((i,result))
 386
 387         if i == self.interface:
 388             self.server_lag = self.blockchain.height() - height
 389             if self.server_lag > 1 and self.config.get('auto_cycle'):
 390                 print_error( "Server lagging, stopping interface")
 391                 self.stop_interface()
 392
 393             self.trigger_callback('updated')
 394
 395
 396     def on_peers(self, i, r):
 397         if not r: return
 398         self.irc_servers = parse_servers(r.get('result'))
 399         self.trigger_callback('peers')
 400
 401     def on_banner(self, i, r):
 402         self.banner = r.get('result')
 403         self.trigger_callback('banner')
 404
 405     def stop(self):
 406         with self.lock: self.running = False
 407
 408     def is_running(self):
 409         with self.lock: return self.running
 410
 411
 412     def synchronous_get(self, requests, timeout=100000000):
 413         return self.interface.synchronous_get(requests)
 414
 415
 416     def get_header(self, tx_height):
 417         return self.blockchain.read_header(tx_height)
 418
 419     def get_local_height(self):
 420         return self.blockchain.height()
 421
 422
 423
 424     #def retrieve_transaction(self, tx_hash, tx_height=0):
 425     #    import transaction
 426     #    r = self.synchronous_get([ ('blockchain.transaction.get',[tx_hash, tx_height]) ])[0]
 427     #    if r:
 428     #        return transaction.Transaction(r)
 429
 430
 431
 432
 433
 434 if __name__ == "__main__":
 435     network = NetworkProxy({})
 436     network.start()
 437     print network.get_servers()
 438
 439     q = Queue.Queue()
 440     network.send([('blockchain.headers.subscribe',[])], q.put)
 441     while True:
 442         r = q.get(timeout=10000)
 443         print r
 444