1 import threading, time, Queue, os, sys, shutil, random
2 from util import user_dir, appdata_dir, print_error, print_msg
5 from blockchain import Blockchain
7 DEFAULT_PORTS = {'t':'50001', 's':'50002', 'h':'8081', 'g':'8082'}
10 # '127.0.0.1': DEFAULT_PORTS,
11 '193.23.181.148': DEFAULT_PORTS,
12 '91.235.143.61': DEFAULT_PORTS,
16 def parse_servers(result):
17 """ parse servers list into dict format"""
18 from version import PROTOCOL_VERSION
27 if re.match("[stgh]\d*", v):
28 protocol, port = v[0], v[1:]
29 if port == '': port = DEFAULT_PORTS[protocol]
31 elif re.match("v(.?)+", v):
33 elif re.match("p\d*", v):
35 if pruning_level == '': pruning_level = '0'
37 is_recent = float(version)>=float(PROTOCOL_VERSION)
42 out['pruning'] = pruning_level
49 def filter_protocol(servers, p):
51 for k, protocols in servers.items():
53 l.append( ':'.join([k, protocols[p], p]) )
57 def pick_random_server(p='s'):
58 return random.choice( filter_protocol(DEFAULT_SERVERS,p) )
60 from simple_config import SimpleConfig
62 class Network(threading.Thread):
64 def __init__(self, config=None):
66 config = {} # Do not use mutables as default values!
67 threading.Thread.__init__(self)
69 self.config = SimpleConfig(config) if type(config) == type({}) else config
70 self.lock = threading.Lock()
71 self.num_server = 8 if not self.config.get('oneserver') else 0
72 self.blockchain = Blockchain(self.config, self)
74 self.queue = Queue.Queue()
76 self.protocol = self.config.get('protocol','s')
79 # Server for addresses and transactions
80 self.default_server = self.config.get('server')
81 if not self.default_server:
82 self.default_server = pick_random_server(self.protocol)
84 self.irc_servers = [] # returned by interface (list from irc)
85 self.pending_servers = set([])
86 self.disconnected_servers = set([])
87 self.recent_servers = self.config.get('recent_servers',[]) # successful connections
91 self.proxy = self.config.get('proxy')
93 self.merkle_roots = {}
97 dir_path = os.path.join( self.config.path, 'certs')
98 if not os.path.exists(dir_path):
101 # default subscriptions
102 self.subscriptions = {}
103 self.subscriptions[self.on_banner] = [('server.banner',[])]
104 self.subscriptions[self.on_peers] = [('server.peers.subscribe',[])]
105 self.pending_transactions_for_notifications = []
108 def is_connected(self):
109 return self.interface and self.interface.is_connected
112 def is_up_to_date(self):
113 return self.interface.is_up_to_date()
116 def main_server(self):
117 return self.interface.server
120 def send_subscriptions(self):
121 for cb, sub in self.subscriptions.items():
122 self.interface.send(sub, cb)
125 def subscribe(self, messages, callback):
127 if self.subscriptions.get(callback) is None:
128 self.subscriptions[callback] = []
129 for message in messages:
130 if message not in self.subscriptions[callback]:
131 self.subscriptions[callback].append(message)
133 if self.is_connected():
134 self.interface.send( messages, callback )
137 def send(self, messages, callback):
138 if self.is_connected():
139 self.interface.send( messages, callback )
145 def register_callback(self, event, callback):
147 if not self.callbacks.get(event):
148 self.callbacks[event] = []
149 self.callbacks[event].append(callback)
152 def trigger_callback(self, event):
154 callbacks = self.callbacks.get(event,[])[:]
156 [callback() for callback in callbacks]
159 def random_server(self):
161 l = filter_protocol(self.get_servers(), self.protocol)
163 if s in self.pending_servers or s in self.disconnected_servers or s in self.interfaces.keys():
166 choice_list.append(s)
169 if not self.interfaces:
170 # we are probably offline, retry later
171 self.disconnected_servers = set([])
174 server = random.choice( choice_list )
178 def get_servers(self):
180 out = self.irc_servers
182 out = DEFAULT_SERVERS
183 for s in self.recent_servers:
184 host, port, protocol = s.split(':')
186 out[host] = { protocol:port }
189 def start_interface(self, server):
190 if server in self.interfaces.keys():
192 i = interface.Interface(server, self.config)
193 self.pending_servers.add(server)
197 def start_random_interface(self):
198 server = self.random_server()
200 self.start_interface(server)
202 def start_interfaces(self):
203 self.interface = self.start_interface(self.default_server)
205 for i in range(self.num_server):
206 self.start_random_interface()
209 def start(self, wait=False):
210 self.start_interfaces()
211 threading.Thread.start(self)
213 return self.wait_until_connected()
215 def wait_until_connected(self):
216 "wait until connection status is known"
217 if self.config.get('auto_cycle'):
218 # self.random_server() returns None if all servers have been tried
219 while not self.is_connected() and self.random_server():
222 self.interface.connect_event.wait()
224 return self.interface.is_connected
227 def set_parameters(self, host, port, protocol, proxy, auto_connect):
229 self.config.set_key('auto_cycle', auto_connect, True)
230 self.config.set_key("proxy", proxy, True)
231 self.config.set_key("protocol", protocol, True)
232 server = ':'.join([ host, port, protocol ])
233 self.config.set_key("server", server, True)
235 if self.proxy != proxy or self.protocol != protocol:
237 self.protocol = protocol
238 for i in self.interfaces.values(): i.stop()
240 #self.interface = None
244 if not self.interface.is_connected:
245 self.switch_to_random_interface()
247 if self.server_lag > 0:
248 self.stop_interface()
250 self.set_server(server)
253 def switch_to_random_interface(self):
255 self.switch_to_interface(random.choice(self.interfaces.values()))
257 def switch_to_interface(self, interface):
258 assert not self.interface.is_connected
259 server = interface.server
260 print_error("switching to", server)
261 self.interface = interface
262 h = self.heights.get(server)
264 self.server_lag = self.blockchain.height() - h
265 self.config.set_key('server', server, False)
266 self.default_server = server
267 self.send_subscriptions()
268 self.trigger_callback('connected')
271 def stop_interface(self):
272 self.interface.stop()
275 def set_server(self, server):
276 if self.default_server == server and self.interface.is_connected:
279 if self.protocol != server.split(':')[2]:
282 # stop the interface in order to terminate subscriptions
283 if self.interface.is_connected:
284 self.stop_interface()
287 self.trigger_callback('disconnecting')
289 self.default_server = server
290 self.config.set_key("server", server, True)
292 if server in self.interfaces.keys():
293 self.switch_to_interface( self.interfaces[server] )
295 self.interface = self.start_interface(server)
298 def add_recent_server(self, i):
301 if s in self.recent_servers:
302 self.recent_servers.remove(s)
303 self.recent_servers.insert(0,s)
304 self.recent_servers = self.recent_servers[0:20]
305 self.config.set_key('recent_servers', self.recent_servers)
308 def new_blockchain_height(self, blockchain_height, i):
309 if self.is_connected():
310 h = self.heights.get(self.interface.server)
312 self.server_lag = blockchain_height - h
313 if self.server_lag > 1:
314 print_error( "Server is lagging", blockchain_height, h)
315 if self.config.get('auto_cycle'):
316 self.set_server(i.server)
318 print_error('no height for main interface')
320 self.trigger_callback('updated')
324 self.blockchain.start()
329 while self.is_running():
331 i = self.queue.get(timeout = 30 if self.interfaces else 3)
333 if len(self.interfaces) < self.num_server:
334 self.start_random_interface()
337 if i.server in self.pending_servers:
338 self.pending_servers.remove(i.server)
341 #if i.server in self.interfaces: raise
342 self.interfaces[i.server] = i
343 self.add_recent_server(i)
344 i.send([ ('blockchain.headers.subscribe',[])], self.on_header)
345 if i == self.interface:
346 print_error('sending subscriptions to', self.interface.server)
347 self.send_subscriptions()
348 self.trigger_callback('connected')
350 self.disconnected_servers.add(i.server)
351 if i.server in self.interfaces:
352 self.interfaces.pop(i.server)
353 if i.server in self.heights:
354 self.heights.pop(i.server)
355 if i == self.interface:
356 #self.interface = None
357 self.trigger_callback('disconnected')
359 if not self.interface.is_connected and self.config.get('auto_cycle'):
360 self.switch_to_random_interface()
363 def on_header(self, i, r):
364 result = r.get('result')
367 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))
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()
382 self.trigger_callback('updated')
385 def on_peers(self, i, r):
387 self.irc_servers = parse_servers(r.get('result'))
388 self.trigger_callback('peers')
390 def on_banner(self, i, r):
391 self.banner = r.get('result')
392 self.trigger_callback('banner')
395 with self.lock: self.running = False
397 def is_running(self):
398 with self.lock: return self.running
401 def synchronous_get(self, requests, timeout=100000000):
402 return self.interface.synchronous_get(requests)
405 def get_header(self, tx_height):
406 return self.blockchain.read_header(tx_height)
408 def get_local_height(self):
409 return self.blockchain.height()
413 #def retrieve_transaction(self, tx_hash, tx_height=0):
415 # r = self.synchronous_get([ ('blockchain.transaction.get',[tx_hash, tx_height]) ])[0]
417 # return transaction.Transaction(r)
423 if __name__ == "__main__":
424 network = NetworkProxy({})
426 print network.get_servers()
429 network.send([('blockchain.headers.subscribe',[])], q.put)
431 r = q.get(timeout=10000)