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