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(hostmap = DEFAULT_SERVERS, protocol = 's'): '''Filters the hostmap for those implementing protocol. The result is a list in serialized form.''' eligible = [] for host, portmap in hostmap.items(): port = portmap.get(protocol) if port: eligible.append(serialize_server(host, port, protocol)) return eligible def pick_random_server(hostmap = DEFAULT_SERVERS, protocol = 's', exclude_set = set()): eligible = list(set(filter_protocol(hostmap, protocol)) - exclude_set) return random.choice(eligible) if eligible else None 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 type(s) != str: 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) # Throw if cannot be converted to int return host, port, protocol def serialize_server(host, port, protocol): return str(':'.join([host, port, protocol])) class Network(util.DaemonThread): """The Network class manages a set of connections to remote electrum servers, each connection is handled by its own thread object returned from Interface(). Its external API: - Member functions get_header(), get_parameters(), get_status_value(), new_blockchain_height(), set_parameters(), start(), stop() """ 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() self.irc_servers = {} # returned by interface (list from irc) self.recent_servers = self.read_recent_servers() self.banner = '' 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. interface is the main server we are currently # communicating with. interfaces is the set of servers we are connecting # to or have an ongoing connection with 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): sh = self.get_server_height() if not sh: self.print_error('no height for main interface') return False lh = self.get_local_height() result = (lh - sh) > 1 if result: self.print_error('%s is lagging (%d vs %d)' % (self.default_server, sh, lh)) return result 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 get_parameters(self): host, port, protocol = deserialize_server(self.default_server) return host, port, protocol, self.proxy, self.auto_connect() def auto_connect(self): return self.config.get('auto_connect', False) def get_interfaces(self): '''The interfaces that are in connected state''' return [s for s, i in self.interfaces.items() if i.is_connected()] 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 not server in self.interfaces.keys(): if server == self.default_server: self.set_status('connecting') i = interface.Interface(server, self.queue, self.config) self.interfaces[i.server] = i i.start() def start_random_interface(self): exclude_set = self.disconnected_servers.union(set(self.interfaces)) server = pick_random_server(self.get_servers(), self.protocol, exclude_set) if server: self.start_interface(server) def start_interfaces(self): self.start_interface(self.default_server) for i in range(self.num_server - 1): self.start_random_interface() def start(self): self.running = True 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.disconnected_servers = set([]) self.protocol = protocol self.set_proxy(proxy) self.start_interfaces() def stop_network(self): 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): server = serialize_server(host, port, protocol) if self.proxy != proxy or self.protocol != protocol: # Restart the network defaulting to the given server self.stop_network() self.default_server = server self.start_network(protocol, proxy) elif self.default_server != server: self.switch_to_interface(server) else: self.switch_lagging_interface() def switch_to_random_interface(self): servers = self.get_interfaces() # Those in connected state if servers: self.switch_to_interface(random.choice(servers)) def switch_lagging_interface(self, suggestion = None): '''If auto_connect and lagging, switch interface''' if self.server_is_lagging() and self.auto_connect(): if suggestion and self.protocol == deserialize_server(suggestion)[2]: self.switch_to_interface(suggestion) else: self.switch_to_random_interface() def switch_to_interface(self, server): '''Switch to server as our interface. If no connection exists nor being opened, start a thread to connect. The actual switch will happen on receipt of the connection notification. Do nothing if server already is our interface.''' self.default_server = server if server not in self.interfaces: self.print_error("starting %s; will switch once connected" % server) self.start_interface(server) return i = self.interfaces[server] if not i.is_connected(): # do nothing; we will switch once connected return if self.interface != i: self.print_error("switching to", server) # stop any current interface in order to terminate subscriptions self.stop_interface() self.interface = i self.addr_responses = {} self.send_subscriptions() self.set_status('connected') self.notify('updated') def stop_interface(self): if self.interface: self.interface.stop() self.interface = None 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 new_blockchain_height(self, blockchain_height, i): self.switch_lagging_interface(i.server) self.notify('updated') def process_if_notification(self, i): '''Handle interface addition and removal through notifications''' if i.is_connected(): self.add_recent_server(i) i.send_request({'method':'blockchain.headers.subscribe','params':[]}) if i.server == self.default_server: self.switch_to_interface(i.server) else: self.interfaces.pop(i.server, None) self.heights.pop(i.server, None) if i == self.interface: self.interface = None self.addr_responses = {} self.set_status('disconnected') self.disconnected_servers.add(i.server) # Our set of interfaces changed self.notify('interfaces') 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: if i != self.interface: return self.unanswered_requests.pop(_id) method = response.get('method') result = response.get('result') if method == 'blockchain.headers.subscribe': self.on_header(i, response) elif method == 'server.peers.subscribe': self.irc_servers = parse_servers(result) self.notify('servers') elif method == 'server.banner': self.banner = result self.notify('banner') elif method == 'blockchain.address.subscribe': addr = response.get('params')[0] self.addr_responses[addr] = result self.response_queue.put(response) else: self.response_queue.put(response) def handle_requests(self): '''Some requests require connectivity, others we handle locally in process_request() and must do so in order to e.g. prevent the daemon seeming unresponsive. ''' unhandled = [] while not self.requests_queue.empty(): request = self.requests_queue.get() if not self.process_request(request): unhandled.append(request) for request in unhandled: self.requests_queue.put(request) def process_request(self, request): '''Returns true if the request was processed.''' method = request['method'] params = request['params'] _id = request['id'] if method.startswith('network.'): out = {'id':_id} try: f = getattr(self, method[8:]) out['result'] = f(*params) except AttributeError: out['error'] = "unknown method" 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 True 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 True # This request needs connectivity. If we don't have an # interface, we cannot process it. if not self.is_connected(): return False self.unanswered_requests[_id] = request self.interface.send_request(request) return True def check_interfaces(self): now = time.time() # nodes if len(self.interfaces) < 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.auto_connect(): self.switch_to_random_interface() 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: self.switch_to_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: self.switch_lagging_interface() self.notify('updated') def get_header(self, tx_height): return self.blockchain.read_header(tx_height) def get_local_height(self): return self.blockchain.height()