electrum-bitcoinprivate/lib/network.py

import threading, time, Queue, os, sys, shutil, random
from util import user_dir, appdata_dir, print_error, print_msg
from bitcoin import *
import interface
from blockchain import Blockchain

DEFAULT_PORTS = {'t':'50001', 's':'50002', 'h':'8081', 'g':'8082'}

DEFAULT_SERVERS = {
    #'the9ull.homelinux.org': {'h': '8082', 't': '50001'},
    'electrum.coinwallet.me': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'},
    'electrum.hachre.de': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'},
    #'electrum.koh.ms': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'},
    'electrum.novit.ro': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'},
    'electrum.stepkrav.pw': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'},
    #'ecdsa.org': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'},
    #'electrum.mooo.com': {'h': '8081', 't': '50001'},
    #'electrum.bitcoins.sk': {'h': '8081', 's': '50002', 't': '50001', 'g': '8'},
    'electrum.no-ip.org': {'h': '80', 's': '50002', 't': '50001', 'g': '443'},
    'electrum.drollette.com': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'},
    'btc.it-zone.org': {'h': '80', 's': '110', 't': '50001', 'g': '443'},
    #'electrum.yacoin.com': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'},
    'electrum.be': {'h': '8081', 's': '50002', 't': '50001', 'g': '8082'}
}


NUM_SERVERS = 8


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():
    return random.choice( filter_protocol(DEFAULT_SERVERS,'s') )

from simple_config import SimpleConfig

class Network(threading.Thread):

    def __init__(self, config = {}):
        threading.Thread.__init__(self)
        self.daemon = True
        self.config = SimpleConfig(config) if type(config) == type({}) else config
        self.lock = threading.Lock()
        self.blockchain = Blockchain(self.config, self)
        self.interfaces = {}
        self.queue = Queue.Queue()
        self.default_server = self.config.get('server')
        self.callbacks = {}

        self.protocol = self.config.get('protocol','s')
        self.irc_servers = []                                      # returned by interface (list from irc)
        self.disconnected_servers = []
        self.recent_servers = self.config.get('recent_servers',[]) # successful connections

        self.banner = ''
        self.interface = None
        self.proxy = self.config.get('proxy')
        self.heights = {}
        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',[])]


    def is_connected(self):
        return self.interface and self.interface.is_connected


    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.interface and self.interface.is_connected:
            self.interface.send( messages, callback )


    def register_callback(self, event, callback):
        with self.lock:
            if not self.callbacks.get(event):
                self.callbacks[event] = []
            self.callbacks[event].append(callback)


    def trigger_callback(self, event):
        with self.lock:
            callbacks = self.callbacks.get(event,[])[:]
        if callbacks:
            [callback() for callback in callbacks]


    def random_server(self):
        choice_list = []
        l = filter_protocol(self.get_servers(), self.protocol)
        for s in l:
            if 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 = []
            return
        
        server = random.choice( choice_list )
        return server


    def get_servers(self):
        out = self.irc_servers if self.irc_servers else 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, self.config)
        self.interfaces[server] = i
        i.start(self.queue)

    def start_random_interface(self):
        server = self.random_server()
        if 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]

        for i in range(NUM_SERVERS):
            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:
            self.interface.connect_event.wait()
            return self.interface.is_connected


    def wait_until_connected(self):
        while not self.interface:
            time.sleep(1)
        self.interface.connect_event.wait()


    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
                self.default_server = None
                return

        if auto_connect:
            if not self.interface:
                self.switch_to_random_interface()
            else:
                if self.server_lag > 0:
                    self.interface.stop()
        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):
        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 set_server(self, server):
        if self.default_server == server and self.interface:
            return

        if self.protocol != server.split(':')[2]:
            return

        # stop the interface in order to terminate subscriptions
        if self.interface:
            self.interface.stop() 

        # 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.start_interface(server)
            self.interface = self.interfaces[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)
        
        self.trigger_callback('updated')


    def run(self):
        self.blockchain.start()

        with self.lock:
            self.running = True

        while self.is_running():
            try:
                i = self.queue.get(timeout = 30 if self.interfaces else 3)
            except Queue.Empty:
                if len(self.interfaces) < NUM_SERVERS:
                    self.start_random_interface()
                continue

            if i.is_connected:
                self.add_recent_server(i)
                i.send([ ('blockchain.headers.subscribe',[])], self.on_header)
                if i == self.interface:
                    print_error('sending subscriptions to', self.interface.server)
                    self.send_subscriptions()
                    self.trigger_callback('connected')
            else:
                self.disconnected_servers.append(i.server)
                self.interfaces.pop(i.server)
                if i.server in self.heights:
                    self.heights.pop(i.server)
                if i == self.interface:
                    self.interface = None
                    self.trigger_callback('disconnected')

            if self.interface is None 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
        self.heights[i.server] = result.get('block_height')
        self.blockchain.queue.put((i,result))

        if i == self.interface:
            self.server_lag = self.blockchain.height - self.heights[i.server]
            self.trigger_callback('updated')


    def on_peers(self, i, r):
        if not r: return
        self.irc_servers = self.parse_servers(r.get('result'))
        self.trigger_callback('peers')

    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):
        queue = Queue.Queue()
        ids = self.interface.send(requests, lambda i,r: queue.put(r))
        id2 = ids[:]
        res = {}
        while ids:
            r = queue.get(True, timeout)
            _id = r.get('id')
            if _id in ids:
                ids.remove(_id)
                res[_id] = r.get('result')
        out = []
        for _id in id2:
            out.append(res[_id])
        return out


    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)


    def parse_servers(self, 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:
                is_recent = False

            if out and is_recent:
                out['pruning'] = pruning_level
                servers[host] = out

        return servers




if __name__ == "__main__":
    import simple_config
    config = simple_config.SimpleConfig({'verbose':True, 'server':'ecdsa.org:50002:s'})
    network = Network(config)
    network.start()

    while 1:
        time.sleep(1)