import time import Queue import os import sys import random import traceback import socks import socket import json import util from bitcoin import * import interface from blockchain import Blockchain DEFAULT_PORTS = {'t':'50001', 's':'50002', 'h':'8081', 'g':'8082'} DEFAULT_SERVERS = { 'electrum.be':DEFAULT_PORTS, 'electrum.drollette.com':{'t':'50001', 's':'50002'}, 'erbium1.sytes.net':{'t':'50001', 's':'50002'}, 'ecdsa.net':{'t':'50001', 's':'110'}, 'eco-electrum.ddns.net':{'t': '50001', 's': '50002', 'h': '80', 'g': '443'}, 'electrum0.electricnewyear.net':{'t':'50001', 's':'50002'}, 'kirsche.emzy.de':{'t':'50001', 's':'50002', 'h':'8081'}, 'electrum2.hachre.de':DEFAULT_PORTS, 'electrum.hsmiths.com':DEFAULT_PORTS, 'EAST.electrum.jdubya.info':DEFAULT_PORTS, 'WEST.electrum.jdubya.info':DEFAULT_PORTS, 'electrum.no-ip.org':{'t':'50001', 's':'50002', 'h':'80', 'g':'443'}, 'electrum.thwg.org':DEFAULT_PORTS, 'us.electrum.be':DEFAULT_PORTS, } NODES_RETRY_INTERVAL = 60 SERVER_RETRY_INTERVAL = 10 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: s = serialize_server(k, protocols[p], p) l.append(s) return l def pick_random_server(p='s'): return random.choice( filter_protocol(DEFAULT_SERVERS,p) ) from simple_config import SimpleConfig proxy_modes = ['socks4', 'socks5', 'http'] def serialize_proxy(p): if type(p) != dict: return None return ':'.join([p.get('mode'),p.get('host'), p.get('port')]) def deserialize_proxy(s): if s is None: return None if s.lower() == 'none': return None proxy = { "mode":"socks5", "host":"localhost" } args = s.split(':') n = 0 if proxy_modes.count(args[n]) == 1: proxy["mode"] = args[n] n += 1 if len(args) > n: proxy["host"] = args[n] n += 1 if len(args) > n: proxy["port"] = args[n] else: proxy["port"] = "8080" if proxy["mode"] == "http" else "1080" return proxy def deserialize_server(server_str): host, port, protocol = str(server_str).split(':') assert protocol in 'st' int(port) return host, port, protocol def serialize_server(host, port, protocol): return str(':'.join([host, port, protocol])) class Network(util.DaemonThread): def __init__(self, pipe, config=None): if config is None: config = {} # Do not use mutables as default values! util.DaemonThread.__init__(self) self.config = SimpleConfig(config) if type(config) == type({}) else config self.num_server = 8 if not self.config.get('oneserver') else 0 self.blockchain = Blockchain(self.config, self) self.queue = Queue.Queue() self.requests_queue = pipe.send_queue self.response_queue = pipe.get_queue # Server for addresses and transactions self.default_server = self.config.get('server') # Sanitize default server try: deserialize_server(self.default_server) except: self.default_server = None if not self.default_server: self.default_server = pick_random_server('s') self.irc_servers = {} # returned by interface (list from irc) self.recent_servers = self.read_recent_servers() self.pending_servers = set() self.banner = '' self.interface = None self.heights = {} self.merkle_roots = {} self.utxo_roots = {} dir_path = os.path.join( self.config.path, 'certs') if not os.path.exists(dir_path): os.mkdir(dir_path) # subscriptions and requests self.subscribed_addresses = set() # cached address status self.addr_responses = {} # unanswered requests self.unanswered_requests = {} # retry times self.server_retry_time = time.time() self.nodes_retry_time = time.time() # kick off the network self.interface = None self.interfaces = {} self.start_network(deserialize_server(self.default_server)[2], deserialize_proxy(self.config.get('proxy'))) def read_recent_servers(self): if not self.config.path: return [] path = os.path.join(self.config.path, "recent_servers") try: with open(path, "r") as f: data = f.read() return json.loads(data) except: return [] def save_recent_servers(self): if not self.config.path: return path = os.path.join(self.config.path, "recent_servers") s = json.dumps(self.recent_servers, indent=4, sort_keys=True) try: with open(path, "w") as f: f.write(s) except: pass def get_server_height(self): return self.heights.get(self.default_server, 0) def server_is_lagging(self): h = self.get_server_height() if not h: self.print_error('no height for main interface') return False lag = self.get_local_height() - self.get_server_height() return lag > 1 def set_status(self, status): self.connection_status = status self.notify('status') def is_connected(self): return self.interface and self.interface.is_connected() def send_subscriptions(self): # clear cache self.cached_responses = {} self.print_error('sending subscriptions to', self.interface.server, len(self.unanswered_requests), len(self.subscribed_addresses)) for r in self.unanswered_requests.values(): self.interface.send_request(r) for addr in self.subscribed_addresses: self.interface.send_request({'method':'blockchain.address.subscribe','params':[addr]}) self.interface.send_request({'method':'server.banner','params':[]}) self.interface.send_request({'method':'server.peers.subscribe','params':[]}) def get_status_value(self, key): if key == 'status': value = self.connection_status elif key == 'banner': value = self.banner elif key == 'updated': value = (self.get_local_height(), self.get_server_height()) elif key == 'servers': value = self.get_servers() elif key == 'interfaces': value = self.get_interfaces() return value def notify(self, key): value = self.get_status_value(key) self.response_queue.put({'method':'network.status', 'params':[key, value]}) def random_server(self): 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: return server = random.choice( choice_list ) return server def get_parameters(self): host, port, protocol = deserialize_server(self.default_server) auto_connect = self.config.get('auto_cycle', True) return host, port, protocol, self.proxy, auto_connect def get_interfaces(self): return self.interfaces.keys() def get_servers(self): if self.irc_servers: out = self.irc_servers else: out = DEFAULT_SERVERS for s in self.recent_servers: try: host, port, protocol = deserialize_server(s) except: continue 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.queue, self.config) self.pending_servers.add(server) i.start() return i def start_random_interface(self): server = self.random_server() if server: self.start_interface(server) def start_interfaces(self): self.interface = self.start_interface(self.default_server) for i in range(self.num_server): self.start_random_interface() def start(self): self.running = True self.start_interfaces() self.blockchain.start() util.DaemonThread.start(self) def set_proxy(self, proxy): self.proxy = proxy if proxy: proxy_mode = proxy_modes.index(proxy["mode"]) + 1 socks.setdefaultproxy(proxy_mode, proxy["host"], int(proxy["port"])) socket.socket = socks.socksocket # prevent dns leaks, see http://stackoverflow.com/questions/13184205/dns-over-proxy socket.getaddrinfo = lambda *args: [(socket.AF_INET, socket.SOCK_STREAM, 6, '', (args[0], args[1]))] else: socket.socket = socket._socketobject socket.getaddrinfo = socket._socket.getaddrinfo def start_network(self, protocol, proxy): assert not self.interface and not self.interfaces self.print_error('starting network') self.set_status('connecting') self.disconnected_servers = set([]) self.protocol = protocol self.set_proxy(proxy) def stop_network(self): # FIXME: this forgets to handle pending servers... self.print_error("stopping network") for i in self.interfaces.values(): i.stop() self.interface = None self.interfaces = {} def set_parameters(self, host, port, protocol, proxy, auto_connect): if self.proxy != proxy or self.protocol != protocol: self.stop_network() self.start_network(protocol, proxy) if auto_connect: return if auto_connect: if not self.is_connected(): self.switch_to_random_interface() else: if self.server_is_lagging(): self.stop_interface() else: server_str = serialize_server(host, port, protocol) self.set_server(server_str) def switch_to_random_interface(self): while self.interfaces: i = random.choice(self.interfaces.values()) if i.is_connected(): self.switch_to_interface(i) break else: self.remove_interface(i) def switch_to_interface(self, interface): server = interface.server self.print_error("switching to", server) self.interface = interface self.default_server = server self.send_subscriptions() self.set_status('connected') self.notify('updated') def stop_interface(self): self.interface.stop() def set_server(self, server): if self.default_server == server and self.is_connected(): return if self.protocol != deserialize_server(server)[2]: return # stop the interface in order to terminate subscriptions if self.is_connected(): self.stop_interface() # notify gui self.set_status('connecting') # start interface self.default_server = server 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.save_recent_servers() def add_interface(self, i): self.interfaces[i.server] = i self.notify('interfaces') def remove_interface(self, i): self.interfaces.pop(i.server) self.notify('interfaces') def new_blockchain_height(self, blockchain_height, i): if self.is_connected(): if self.server_is_lagging(): self.print_error("Server is lagging", blockchain_height, self.get_server_height()) if self.config.get('auto_cycle'): self.set_server(i.server) self.notify('updated') def process_if_notification(self, i): if i.server in self.pending_servers: self.pending_servers.remove(i.server) if i.is_connected(): self.add_interface(i) self.add_recent_server(i) i.send_request({'method':'blockchain.headers.subscribe','params':[]}) if i == self.interface: self.send_subscriptions() self.set_status('connected') else: if i.server in self.interfaces: self.remove_interface(i) if i.server in self.heights: self.heights.pop(i.server) if i == self.interface: self.set_status('disconnected') self.disconnected_servers.add(i.server) def process_response(self, i, response): # the id comes from the daemon or the network proxy _id = response.get('id') if _id is not None: self.unanswered_requests.pop(_id) method = response['method'] if method == 'blockchain.address.subscribe': self.on_address(i, response) elif method == 'blockchain.headers.subscribe': self.on_header(i, response) elif method == 'server.peers.subscribe': self.on_peers(i, response) elif method == 'server.banner': self.on_banner(i, response) else: self.response_queue.put(response) def handle_requests(self): while True: try: request = self.requests_queue.get_nowait() except Queue.Empty: break self.process_request(request) def process_request(self, request): method = request['method'] params = request['params'] _id = request['id'] if method.startswith('network.'): out = {'id':_id} try: f = getattr(self, method[8:]) except AttributeError: out['error'] = "unknown method" try: out['result'] = f(*params) except BaseException as e: out['error'] = str(e) traceback.print_exc(file=sys.stdout) self.print_error("network error", str(e)) self.response_queue.put(out) return if method == 'blockchain.address.subscribe': addr = params[0] self.subscribed_addresses.add(addr) if addr in self.addr_responses: self.response_queue.put({'id':_id, 'result':self.addr_responses[addr]}) return # store unanswered request self.unanswered_requests[_id] = request self.interface.send_request(request) def check_interfaces(self): now = time.time() # nodes if len(self.interfaces) + len(self.pending_servers) < self.num_server: self.start_random_interface() if now - self.nodes_retry_time > NODES_RETRY_INTERVAL: self.print_error('network: retrying connections') self.disconnected_servers = set([]) self.nodes_retry_time = now # main interface if not self.is_connected(): if self.config.get('auto_cycle'): if self.interfaces: self.switch_to_random_interface() else: if self.default_server in self.interfaces.keys(): self.switch_to_interface(self.interfaces[self.default_server]) else: if self.default_server in self.disconnected_servers: if now - self.server_retry_time > SERVER_RETRY_INTERVAL: self.disconnected_servers.remove(self.default_server) self.server_retry_time = now else: if self.default_server not in self.pending_servers: self.print_error("forcing reconnection") self.interface = self.start_interface(self.default_server) def run(self): while self.is_running(): self.check_interfaces() self.handle_requests() try: i, response = self.queue.get(timeout=0.1) except Queue.Empty: continue # if response is None it is a notification about the interface if response is None: self.process_if_notification(i) else: self.process_response(i, response) self.stop_network() self.print_error("stopped") 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: if self.server_is_lagging() and self.config.get('auto_cycle'): self.print_error("Server lagging, stopping interface") self.stop_interface() self.notify('updated') def on_peers(self, i, r): if not r: return self.irc_servers = parse_servers(r.get('result')) self.notify('servers') def on_banner(self, i, r): self.banner = r.get('result') self.notify('banner') def on_address(self, i, r): addr = r.get('params')[0] result = r.get('result') self.addr_responses[addr] = result self.response_queue.put(r) def get_header(self, tx_height): return self.blockchain.read_header(tx_height) def get_local_height(self): return self.blockchain.height()