import interface
from blockchain import Blockchain
+DEFAULT_PORTS = {'t':'40001', 's':'40002', 'h':'7081', 'g':'7082'}
+
+DEFAULT_SERVERS = {
+# '127.0.0.1': DEFAULT_PORTS,
+ '193.23.181.148': DEFAULT_PORTS,
+ '91.235.143.61': DEFAULT_PORTS,
+}
+
+
+def parse_servers(result):
+ """ parse servers list into dict format"""
+ from version import PROTOCOL_VERSION
+ servers = {}
+ for item in result:
+ host = item[1]
+ out = {}
+ version = None
+ pruning_level = '-'
+ if len(item) > 2:
+ for v in item[2]:
+ if re.match("[stgh]\d*", v):
+ protocol, port = v[0], v[1:]
+ if port == '': port = DEFAULT_PORTS[protocol]
+ out[protocol] = port
+ elif re.match("v(.?)+", v):
+ version = v[1:]
+ elif re.match("p\d*", v):
+ pruning_level = v[1:]
+ if pruning_level == '': pruning_level = '0'
+ try:
+ is_recent = float(version)>=float(PROTOCOL_VERSION)
+ except Exception:
+ is_recent = False
+
+ if out and is_recent:
+ out['pruning'] = pruning_level
+ servers[host] = out
+
+ return servers
+
+
+
+def filter_protocol(servers, p):
+ l = []
+ for k, protocols in servers.items():
+ if p in protocols:
+ l.append( ':'.join([k, protocols[p], p]) )
+ return l
+
+
+def pick_random_server(p='s'):
+ return random.choice( filter_protocol(DEFAULT_SERVERS,p) )
+
+from simple_config import SimpleConfig
class Network(threading.Thread):
- def __init__(self, config):
+ def __init__(self, config=None):
+ if config is None:
+ config = {} # Do not use mutables as default values!
threading.Thread.__init__(self)
self.daemon = True
- self.config = config
+ self.config = SimpleConfig(config) if type(config) == type({}) else config
self.lock = threading.Lock()
- self.blockchain = Blockchain(config, self)
+ self.num_server = 8 if not self.config.get('oneserver') else 0
+ self.blockchain = Blockchain(self.config, self)
self.interfaces = {}
self.queue = Queue.Queue()
- self.default_server = self.config.get('server')
- self.servers_list = interface.filter_protocol(interface.DEFAULT_SERVERS,'s')
self.callbacks = {}
+ self.protocol = self.config.get('protocol','s')
+ self.running = False
+
+ # Server for addresses and transactions
+ self.default_server = self.config.get('server')
+ if not self.default_server:
+ self.default_server = pick_random_server(self.protocol)
+
+ self.irc_servers = [] # returned by interface (list from irc)
+ self.pending_servers = set([])
+ self.disconnected_servers = set([])
+ self.recent_servers = self.config.get('recent_servers',[]) # successful connections
+
+ self.banner = ''
+ self.interface = None
+ self.proxy = self.config.get('proxy')
+ self.heights = {}
+ self.merkle_roots = {}
+ self.utxo_roots = {}
+ self.server_lag = 0
+
+ dir_path = os.path.join( self.config.path, 'certs')
+ if not os.path.exists(dir_path):
+ os.mkdir(dir_path)
+
+ # default subscriptions
+ self.subscriptions = {}
+ self.subscriptions[self.on_banner] = [('server.banner',[])]
+ self.subscriptions[self.on_peers] = [('server.peers.subscribe',[])]
+ self.pending_transactions_for_notifications = []
+
+
+ def is_connected(self):
+ return self.interface and self.interface.is_connected
+
+
+ def is_up_to_date(self):
+ return self.interface.is_up_to_date()
+
+
+ def main_server(self):
+ return self.interface.server
+
+
+ def send_subscriptions(self):
+ for cb, sub in self.subscriptions.items():
+ self.interface.send(sub, cb)
+
+
+ def subscribe(self, messages, callback):
+ with self.lock:
+ if self.subscriptions.get(callback) is None:
+ self.subscriptions[callback] = []
+ for message in messages:
+ if message not in self.subscriptions[callback]:
+ self.subscriptions[callback].append(message)
+
+ if self.is_connected():
+ self.interface.send( messages, callback )
+
+
+ def send(self, messages, callback):
+ if self.is_connected():
+ self.interface.send( messages, callback )
+ return True
+ else:
+ return False
def register_callback(self, event, callback):
def random_server(self):
- if len(self.servers_list) <= len(self.interfaces.keys()):
+ choice_list = []
+ l = filter_protocol(self.get_servers(), self.protocol)
+ for s in l:
+ if s in self.pending_servers or s in self.disconnected_servers or s in self.interfaces.keys():
+ continue
+ else:
+ choice_list.append(s)
+
+ if not choice_list:
+ if not self.interfaces:
+ # we are probably offline, retry later
+ self.disconnected_servers = set([])
return
- while True:
- server = random.choice( self.servers_list )
- if server not in self.interfaces.keys(): break
-
+ server = random.choice( choice_list )
return server
+ def get_servers(self):
+ if self.irc_servers:
+ out = self.irc_servers
+ else:
+ out = DEFAULT_SERVERS
+ for s in self.recent_servers:
+ host, port, protocol = s.split(':')
+ if host not in out:
+ out[host] = { protocol:port }
+ return out
+
def start_interface(self, server):
if server in self.interfaces.keys():
return
- i = interface.Interface({'server':server})
- i.network = self # fixme
- self.interfaces[server] = i
+ i = interface.Interface(server, self.config)
+ self.pending_servers.add(server)
i.start(self.queue)
+ return i
def start_random_interface(self):
server = self.random_server()
self.start_interface(server)
def start_interfaces(self):
- if self.default_server:
- self.start_interface(self.default_server)
- self.interface = self.interfaces[self.default_server]
+ self.interface = self.start_interface(self.default_server)
- for i in range(8):
+ for i in range(self.num_server):
self.start_random_interface()
- if not self.interface:
- self.interface = self.interfaces.values()[0]
-
def start(self, wait=False):
self.start_interfaces()
threading.Thread.start(self)
if wait:
+ return self.wait_until_connected()
+
+ def wait_until_connected(self):
+ "wait until connection status is known"
+ if self.config.get('auto_cycle'):
+ # self.random_server() returns None if all servers have been tried
+ while not self.is_connected() and self.random_server():
+ time.sleep(0.1)
+ else:
self.interface.connect_event.wait()
- return self.interface.is_connected
+
+ return self.interface.is_connected
+
+
+ def set_parameters(self, host, port, protocol, proxy, auto_connect):
+
+ self.config.set_key('auto_cycle', auto_connect, True)
+ self.config.set_key("proxy", proxy, True)
+ self.config.set_key("protocol", protocol, True)
+ server = ':'.join([ host, port, protocol ])
+ self.config.set_key("server", server, True)
+
+ if self.proxy != proxy or self.protocol != protocol:
+ self.proxy = proxy
+ self.protocol = protocol
+ for i in self.interfaces.values(): i.stop()
+ if auto_connect:
+ #self.interface = None
+ return
+
+ if auto_connect:
+ if not self.interface.is_connected:
+ self.switch_to_random_interface()
+ else:
+ if self.server_lag > 0:
+ self.stop_interface()
+ else:
+ self.set_server(server)
+
+
+ def switch_to_random_interface(self):
+ if self.interfaces:
+ self.switch_to_interface(random.choice(self.interfaces.values()))
+
+ def switch_to_interface(self, interface):
+ assert not self.interface.is_connected
+ server = interface.server
+ print_error("switching to", server)
+ self.interface = interface
+ h = self.heights.get(server)
+ if h:
+ self.server_lag = self.blockchain.height() - h
+ self.config.set_key('server', server, False)
+ self.default_server = server
+ self.send_subscriptions()
+ self.trigger_callback('connected')
+
+
+ def stop_interface(self):
+ self.interface.stop()
+
+
+ def set_server(self, server):
+ if self.default_server == server and self.interface.is_connected:
+ return
+
+ if self.protocol != server.split(':')[2]:
+ return
+
+ # stop the interface in order to terminate subscriptions
+ if self.interface.is_connected:
+ self.stop_interface()
+
+ # notify gui
+ self.trigger_callback('disconnecting')
+ # start interface
+ self.default_server = server
+ self.config.set_key("server", server, True)
+
+ if server in self.interfaces.keys():
+ self.switch_to_interface( self.interfaces[server] )
+ else:
+ self.interface = self.start_interface(server)
+
+
+ def add_recent_server(self, i):
+ # list is ordered
+ s = i.server
+ if s in self.recent_servers:
+ self.recent_servers.remove(s)
+ self.recent_servers.insert(0,s)
+ self.recent_servers = self.recent_servers[0:20]
+ self.config.set_key('recent_servers', self.recent_servers)
+
+
+ def new_blockchain_height(self, blockchain_height, i):
+ if self.is_connected():
+ h = self.heights.get(self.interface.server)
+ if h:
+ self.server_lag = blockchain_height - h
+ if self.server_lag > 1:
+ print_error( "Server is lagging", blockchain_height, h)
+ if self.config.get('auto_cycle'):
+ self.set_server(i.server)
+ else:
+ print_error('no height for main interface')
+
+ self.trigger_callback('updated')
def run(self):
self.running = True
while self.is_running():
- i = self.queue.get()
+ try:
+ i = self.queue.get(timeout = 30 if self.interfaces else 3)
+ except Queue.Empty:
+ if len(self.interfaces) < self.num_server:
+ self.start_random_interface()
+ continue
- if i.is_connected:
- i.register_channel('verifier', self.blockchain.queue)
- i.register_channel('get_header')
- i.send([ ('blockchain.headers.subscribe',[])], 'verifier')
+ if i.server in self.pending_servers:
+ self.pending_servers.remove(i.server)
+ if i.is_connected:
+ #if i.server in self.interfaces: raise
+ self.interfaces[i.server] = i
+ self.add_recent_server(i)
+ i.send([ ('blockchain.headers.subscribe',[])], self.on_header)
if i == self.interface:
- i.send([('server.banner',[])])
- i.send([('server.peers.subscribe',[])])
+ print_error('sending subscriptions to', self.interface.server)
+ self.send_subscriptions()
+ self.trigger_callback('connected')
else:
- self.servers_list.remove(i.server)
- self.interfaces.pop(i.server)
- self.start_random_interface()
-
+ self.disconnected_servers.add(i.server)
+ if i.server in self.interfaces:
+ self.interfaces.pop(i.server)
+ if i.server in self.heights:
+ self.heights.pop(i.server)
if i == self.interface:
- if self.config.get('auto_cycle'):
- self.interface = random.choice(self.interfaces.values())
- self.config.set_key('server', self.interface.server, False)
- else:
- self.trigger_callback('disconnected')
-
+ #self.interface = None
+ self.trigger_callback('disconnected')
+
+ if not self.interface.is_connected and self.config.get('auto_cycle'):
+ self.switch_to_random_interface()
+
+
+ def on_header(self, i, r):
+ result = r.get('result')
+ if not result:
+ return
+ height = result.get('block_height')
+ if not height:
+ return
+ self.heights[i.server] = height
+ self.merkle_roots[i.server] = result.get('merkle_root')
+ self.utxo_roots[i.server] = result.get('utxo_root')
+ # notify blockchain about the new height
+ self.blockchain.queue.put((i,result))
+
+ if i == self.interface:
+ self.server_lag = self.blockchain.height() - height
+ if self.server_lag > 1 and self.config.get('auto_cycle'):
+ print_error( "Server lagging, stopping interface")
+ self.stop_interface()
+
+ self.trigger_callback('updated')
+
- def on_peers(self, result):
- # populate servers list here
- pass
+ def on_peers(self, i, r):
+ if not r: return
+ self.irc_servers = parse_servers(r.get('result'))
+ self.trigger_callback('peers')
- def on_banner(self, result):
- pass
+ def on_banner(self, i, r):
+ self.banner = r.get('result')
+ self.trigger_callback('banner')
def stop(self):
with self.lock: self.running = False
def is_running(self):
with self.lock: return self.running
+
+ def synchronous_get(self, requests, timeout=100000000):
+ return self.interface.synchronous_get(requests)
- def resend_subscriptions(self):
- for channel, messages in self.subscriptions.items():
- if messages:
- self.send(messages, channel)
+ def get_header(self, tx_height):
+ return self.blockchain.read_header(tx_height)
+ def get_local_height(self):
+ return self.blockchain.height()
-if __name__ == "__main__":
- import simple_config
- config = simple_config.SimpleConfig({'verbose':True})
- network = Network(config)
- network.start()
- while 1:
- time.sleep(1)
+ #def retrieve_transaction(self, tx_hash, tx_height=0):
+ # import transaction
+ # r = self.synchronous_get([ ('blockchain.transaction.get',[tx_hash, tx_height]) ])[0]
+ # if r:
+ # return transaction.Transaction(r)
+
+
+if __name__ == "__main__":
+ network = NetworkProxy({})
+ network.start()
+ print network.get_servers()
+
+ q = Queue.Queue()
+ network.send([('blockchain.headers.subscribe',[])], q.put)
+ while True:
+ r = q.get(timeout=10000)
+ print r
+
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