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