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
   8 class Network(threading.Thread):
   9
  10     def __init__(self, config):
  11         threading.Thread.__init__(self)
  12         self.daemon = True
  13         self.config = config
  14         self.lock = threading.Lock()
  15         self.blockchain = Blockchain(config, self)
  16         self.interfaces = {}
  17         self.queue = Queue.Queue()
  18         self.default_server = self.config.get('server')
  19         self.servers_list = interface.filter_protocol(interface.DEFAULT_SERVERS,'s')
  20         self.callbacks = {}
  21
  22
  23     def register_callback(self, event, callback):
  24         with self.lock:
  25             if not self.callbacks.get(event):
  26                 self.callbacks[event] = []
  27             self.callbacks[event].append(callback)
  28
  29
  30     def trigger_callback(self, event):
  31         with self.lock:
  32             callbacks = self.callbacks.get(event,[])[:]
  33         if callbacks:
  34             [callback() for callback in callbacks]
  35
  36
  37     def random_server(self):
  38         if len(self.servers_list) <= len(self.interfaces.keys()):
  39             return
  40
  41         while True:
  42             server = random.choice( self.servers_list )
  43             if server not in self.interfaces.keys(): break
  44
  45         return server
  46
  47
  48     def start_interface(self, server):
  49         if server in self.interfaces.keys():
  50             return
  51         i = interface.Interface({'server':server})
  52         i.network = self # fixme
  53         self.interfaces[server] = i
  54         i.start(self.queue)
  55
  56     def start_random_interface(self):
  57         server = self.random_server()
  58         if server:
  59             self.start_interface(server)
  60
  61     def start_interfaces(self):
  62         if self.default_server:
  63             self.start_interface(self.default_server)
  64             self.interface = self.interfaces[self.default_server]
  65
  66         for i in range(8):
  67             self.start_random_interface()
  68
  69         if not self.interface:
  70             self.interface = self.interfaces.values()[0]
  71
  72
  73     def start(self, wait=False):
  74         self.start_interfaces()
  75         threading.Thread.start(self)
  76         if wait:
  77             self.interface.connect_event.wait()
  78             return self.interface.is_connected
  79
  80
  81     def set_server(self, server, proxy):
  82         subscriptions = self.interface.subscriptions
  83         self.default_server = server
  84         self.start_interface(server)
  85         self.interface = self.interfaces[server]
  86         self.resend_subscriptions(subscriptions)
  87         self.trigger_callback('disconnecting') # for actively disconnecting
  88
  89
  90     def run(self):
  91         self.blockchain.start()
  92
  93         with self.lock:
  94             self.running = True
  95
  96         while self.is_running():
  97             i = self.queue.get()
  98
  99             if i.is_connected:
 100                 i.register_channel('verifier', self.blockchain.queue)
 101                 i.register_channel('get_header')
 102                 i.send([ ('blockchain.headers.subscribe',[])], 'verifier')
 103
 104                 if i == self.interface:
 105                     i.send([('server.banner',[])])
 106                     i.send([('server.peers.subscribe',[])])
 107             else:
 108                 self.servers_list.remove(i.server)
 109                 self.interfaces.pop(i.server)
 110                 self.start_random_interface()
 111
 112                 if i == self.interface:
 113                     if self.config.get('auto_cycle'):
 114                         self.interface = random.choice(self.interfaces.values())
 115                         self.config.set_key('server', self.interface.server, False)
 116                     else:
 117                         self.trigger_callback('disconnected')
 118
 119
 120     def on_peers(self, result):
 121         # populate servers list here
 122         pass
 123
 124     def on_banner(self, result):
 125         pass
 126
 127     def stop(self):
 128         with self.lock: self.running = False
 129
 130     def is_running(self):
 131         with self.lock: return self.running
 132
 133
 134     def resend_subscriptions(self, subscriptions):
 135         for channel, messages in subscriptions.items():
 136             if messages:
 137                 self.interface.send(messages, channel)
 138
 139
 140
 141
 142 if __name__ == "__main__":
 143     import simple_config
 144     config = simple_config.SimpleConfig({'verbose':True})
 145     network = Network(config)
 146     network.start()
 147
 148     while 1:
 149         time.sleep(1)
 150
 151
 152