831 lines
32 KiB
Python
831 lines
32 KiB
Python
# Electrum - Lightweight Bitcoin Client
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# Copyright (c) 2011-2016 Thomas Voegtlin
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import time
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import Queue
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import os
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import errno
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import sys
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import random
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import select
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import traceback
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from collections import defaultdict, deque
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from threading import Lock
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import socks
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import socket
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import json
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import util
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from bitcoin import *
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from interface import Connection, Interface
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from blockchain import Blockchain
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from version import ELECTRUM_VERSION, PROTOCOL_VERSION
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DEFAULT_PORTS = {'t':'50001', 's':'50002', 'h':'8081', 'g':'8082'}
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DEFAULT_SERVERS = {
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'erbium1.sytes.net':{'t':'50001', 's':'50002'},
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'ecdsa.net':{'t':'50001', 's':'110'},
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'electrum0.electricnewyear.net':{'t':'50001', 's':'50002'},
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'VPS.hsmiths.com':{'t':'50001', 's':'50002'},
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'ELECTRUM.jdubya.info':{'t':'50001', 's':'50002'},
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'electrum.no-ip.org':{'t':'50001', 's':'50002', 'g':'443'},
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'us.electrum.be':DEFAULT_PORTS,
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'bitcoins.sk':{'t':'50001', 's':'50002'},
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'electrum.petrkr.net':{'t':'50001', 's':'50002'},
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'electrum.dragonzone.net':DEFAULT_PORTS,
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'Electrum.hsmiths.com':{'t':'8080', 's':'995'},
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'electrum3.hachre.de':{'t':'50001', 's':'50002'},
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'elec.luggs.co':{'t':'80', 's':'443'},
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'btc.smsys.me':{'t':'110', 's':'995'},
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'electrum.online':{'t':'50001', 's':'50002'},
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}
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NODES_RETRY_INTERVAL = 60
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SERVER_RETRY_INTERVAL = 10
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def parse_servers(result):
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""" parse servers list into dict format"""
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from version import PROTOCOL_VERSION
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servers = {}
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for item in result:
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host = item[1]
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out = {}
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version = None
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pruning_level = '-'
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if len(item) > 2:
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for v in item[2]:
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if re.match("[stgh]\d*", v):
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protocol, port = v[0], v[1:]
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if port == '': port = DEFAULT_PORTS[protocol]
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out[protocol] = port
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elif re.match("v(.?)+", v):
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version = v[1:]
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elif re.match("p\d*", v):
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pruning_level = v[1:]
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if pruning_level == '': pruning_level = '0'
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try:
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is_recent = cmp(util.normalize_version(version), util.normalize_version(PROTOCOL_VERSION)) >= 0
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except Exception:
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is_recent = False
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if out and is_recent:
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out['pruning'] = pruning_level
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servers[host] = out
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return servers
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def filter_protocol(hostmap = DEFAULT_SERVERS, protocol = 's'):
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'''Filters the hostmap for those implementing protocol.
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The result is a list in serialized form.'''
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eligible = []
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for host, portmap in hostmap.items():
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port = portmap.get(protocol)
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if port:
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eligible.append(serialize_server(host, port, protocol))
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return eligible
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def pick_random_server(hostmap = DEFAULT_SERVERS, protocol = 's', exclude_set = set()):
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eligible = list(set(filter_protocol(hostmap, protocol)) - exclude_set)
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return random.choice(eligible) if eligible else None
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from simple_config import SimpleConfig
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proxy_modes = ['socks4', 'socks5', 'http']
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def serialize_proxy(p):
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if type(p) != dict:
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return None
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return ':'.join([p.get('mode'),p.get('host'), p.get('port')])
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def deserialize_proxy(s):
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if type(s) not in [str, unicode]:
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return None
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if s.lower() == 'none':
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return None
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proxy = { "mode":"socks5", "host":"localhost" }
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args = s.split(':')
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n = 0
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if proxy_modes.count(args[n]) == 1:
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proxy["mode"] = args[n]
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n += 1
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if len(args) > n:
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proxy["host"] = args[n]
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n += 1
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if len(args) > n:
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proxy["port"] = args[n]
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else:
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proxy["port"] = "8080" if proxy["mode"] == "http" else "1080"
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return proxy
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def deserialize_server(server_str):
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host, port, protocol = str(server_str).split(':')
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assert protocol in 'st'
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int(port) # Throw if cannot be converted to int
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return host, port, protocol
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def serialize_server(host, port, protocol):
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return str(':'.join([host, port, protocol]))
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class Network(util.DaemonThread):
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"""The Network class manages a set of connections to remote electrum
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servers, each connected socket is handled by an Interface() object.
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Connections are initiated by a Connection() thread which stops once
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the connection succeeds or fails.
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Our external API:
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- Member functions get_header(), get_interfaces(), get_local_height(),
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get_parameters(), get_server_height(), get_status_value(),
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is_connected(), set_parameters(), stop()
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"""
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def __init__(self, config=None):
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if config is None:
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config = {} # Do not use mutables as default values!
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util.DaemonThread.__init__(self)
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self.config = SimpleConfig(config) if type(config) == type({}) else config
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self.num_server = 8 if not self.config.get('oneserver') else 0
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self.blockchain = Blockchain(self.config, self)
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# A deque of interface header requests, processed left-to-right
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self.bc_requests = deque()
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# Server for addresses and transactions
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self.default_server = self.config.get('server')
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# Sanitize default server
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try:
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deserialize_server(self.default_server)
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except:
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self.default_server = None
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if not self.default_server:
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self.default_server = pick_random_server()
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self.lock = Lock()
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self.pending_sends = []
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self.message_id = 0
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self.debug = False
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self.irc_servers = {} # returned by interface (list from irc)
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self.recent_servers = self.read_recent_servers()
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self.banner = ''
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self.donation_address = ''
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self.fee = None
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self.relay_fee = None
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self.heights = {}
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self.merkle_roots = {}
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self.utxo_roots = {}
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# callbacks passed with subscriptions
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self.subscriptions = defaultdict(list)
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self.sub_cache = {}
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# callbacks set by the GUI
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self.callbacks = defaultdict(list)
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dir_path = os.path.join( self.config.path, 'certs')
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if not os.path.exists(dir_path):
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os.mkdir(dir_path)
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# subscriptions and requests
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self.subscribed_addresses = set()
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# Requests from client we've not seen a response to
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self.unanswered_requests = {}
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# retry times
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self.server_retry_time = time.time()
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self.nodes_retry_time = time.time()
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# kick off the network. interface is the main server we are currently
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# communicating with. interfaces is the set of servers we are connecting
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# to or have an ongoing connection with
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self.interface = None
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self.interfaces = {}
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self.auto_connect = self.config.get('auto_connect', False)
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self.connecting = set()
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self.socket_queue = Queue.Queue()
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self.start_network(deserialize_server(self.default_server)[2],
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deserialize_proxy(self.config.get('proxy')))
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def register_callback(self, callback, events):
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with self.lock:
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for event in events:
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self.callbacks[event].append(callback)
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def unregister_callback(self, callback):
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with self.lock:
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for callbacks in self.callbacks.values():
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if callback in callbacks:
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callbacks.remove(callback)
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def trigger_callback(self, event, *args):
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with self.lock:
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callbacks = self.callbacks[event][:]
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[callback(event, *args) for callback in callbacks]
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def read_recent_servers(self):
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if not self.config.path:
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return []
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path = os.path.join(self.config.path, "recent_servers")
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try:
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with open(path, "r") as f:
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data = f.read()
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return json.loads(data)
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except:
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return []
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def save_recent_servers(self):
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if not self.config.path:
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return
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path = os.path.join(self.config.path, "recent_servers")
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s = json.dumps(self.recent_servers, indent=4, sort_keys=True)
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try:
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with open(path, "w") as f:
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f.write(s)
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except:
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pass
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def get_server_height(self):
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return self.heights.get(self.default_server, 0)
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def server_is_lagging(self):
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sh = self.get_server_height()
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if not sh:
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self.print_error('no height for main interface')
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return True
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lh = self.get_local_height()
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result = (lh - sh) > 1
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if result:
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self.print_error('%s is lagging (%d vs %d)' % (self.default_server, sh, lh))
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return result
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def set_status(self, status):
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self.connection_status = status
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self.notify('status')
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def is_connected(self):
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return self.interface is not None
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def is_connecting(self):
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return self.connection_status == 'connecting'
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def is_up_to_date(self):
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return self.unanswered_requests == {}
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def queue_request(self, method, params, interface=None):
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# If you want to queue a request on any interface it must go
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# through this function so message ids are properly tracked
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if interface is None:
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interface = self.interface
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message_id = self.message_id
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self.message_id += 1
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if self.debug:
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self.print_error(interface.host, "-->", method, params, message_id)
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interface.queue_request(method, params, message_id)
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return message_id
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def send_subscriptions(self):
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self.print_error('sending subscriptions to', self.interface.server, len(self.unanswered_requests), len(self.subscribed_addresses))
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self.sub_cache.clear()
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# Resend unanswered requests
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requests = self.unanswered_requests.values()
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self.unanswered_requests = {}
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for request in requests:
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message_id = self.queue_request(request[0], request[1])
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self.unanswered_requests[message_id] = request
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for addr in self.subscribed_addresses:
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self.queue_request('blockchain.address.subscribe', [addr])
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self.queue_request('server.banner', [])
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self.queue_request('server.donation_address', [])
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self.queue_request('server.peers.subscribe', [])
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self.queue_request('blockchain.estimatefee', [2])
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self.queue_request('blockchain.relayfee', [])
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def get_status_value(self, key):
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if key == 'status':
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value = self.connection_status
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elif key == 'banner':
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value = self.banner
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elif key == 'fee':
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value = self.fee
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elif key == 'updated':
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value = (self.get_local_height(), self.get_server_height())
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elif key == 'servers':
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value = self.get_servers()
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elif key == 'interfaces':
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value = self.get_interfaces()
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return value
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def notify(self, key):
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if key in ['status', 'updated']:
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self.trigger_callback(key)
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else:
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self.trigger_callback(key, self.get_status_value(key))
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def get_parameters(self):
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host, port, protocol = deserialize_server(self.default_server)
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return host, port, protocol, self.proxy, self.auto_connect
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def get_donation_address(self):
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if self.is_connected():
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return self.donation_address
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def get_interfaces(self):
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'''The interfaces that are in connected state'''
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return self.interfaces.keys()
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def get_servers(self):
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if self.irc_servers:
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out = self.irc_servers
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else:
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out = DEFAULT_SERVERS
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for s in self.recent_servers:
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try:
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host, port, protocol = deserialize_server(s)
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except:
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continue
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if host not in out:
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out[host] = { protocol:port }
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return out
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def start_interface(self, server):
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if (not server in self.interfaces and not server in self.connecting):
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if server == self.default_server:
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self.print_error("connecting to %s as new interface" % server)
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self.set_status('connecting')
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self.connecting.add(server)
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c = Connection(server, self.socket_queue, self.config.path)
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def start_random_interface(self):
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exclude_set = self.disconnected_servers.union(set(self.interfaces))
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server = pick_random_server(self.get_servers(), self.protocol, exclude_set)
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if server:
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self.start_interface(server)
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def start_interfaces(self):
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self.start_interface(self.default_server)
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for i in range(self.num_server - 1):
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self.start_random_interface()
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def set_proxy(self, proxy):
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self.proxy = proxy
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if proxy:
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self.print_error('setting proxy', proxy)
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proxy_mode = proxy_modes.index(proxy["mode"]) + 1
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socks.setdefaultproxy(proxy_mode, proxy["host"], int(proxy["port"]))
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socket.socket = socks.socksocket
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# prevent dns leaks, see http://stackoverflow.com/questions/13184205/dns-over-proxy
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socket.getaddrinfo = lambda *args: [(socket.AF_INET, socket.SOCK_STREAM, 6, '', (args[0], args[1]))]
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else:
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socket.socket = socket._socketobject
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socket.getaddrinfo = socket._socket.getaddrinfo
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def start_network(self, protocol, proxy):
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assert not self.interface and not self.interfaces
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assert not self.connecting and self.socket_queue.empty()
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self.print_error('starting network')
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self.disconnected_servers = set([])
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self.protocol = protocol
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self.set_proxy(proxy)
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self.start_interfaces()
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def stop_network(self):
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self.print_error("stopping network")
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for interface in self.interfaces.values():
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self.close_interface(interface)
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assert self.interface is None
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assert not self.interfaces
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self.connecting = set()
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# Get a new queue - no old pending connections thanks!
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self.socket_queue = Queue.Queue()
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def set_parameters(self, host, port, protocol, proxy, auto_connect):
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proxy_str = serialize_proxy(proxy)
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server = serialize_server(host, port, protocol)
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self.config.set_key('auto_connect', auto_connect, False)
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self.config.set_key("proxy", proxy_str, False)
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self.config.set_key("server", server, True)
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# abort if changes were not allowed by config
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if self.config.get('server') != server or self.config.get('proxy') != proxy_str:
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return
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self.auto_connect = auto_connect
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if self.proxy != proxy or self.protocol != protocol:
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# Restart the network defaulting to the given server
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self.stop_network()
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self.default_server = server
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self.start_network(protocol, proxy)
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elif self.default_server != server:
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self.switch_to_interface(server)
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else:
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self.switch_lagging_interface()
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def switch_to_random_interface(self):
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'''Switch to a random connected server other than the current one'''
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servers = self.get_interfaces() # Those in connected state
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if self.default_server in servers:
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servers.remove(self.default_server)
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if servers:
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self.switch_to_interface(random.choice(servers))
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def switch_lagging_interface(self, suggestion = None):
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'''If auto_connect and lagging, switch interface'''
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if self.server_is_lagging() and self.auto_connect:
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if suggestion and self.protocol == deserialize_server(suggestion)[2]:
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self.switch_to_interface(suggestion)
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else:
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self.switch_to_random_interface()
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|
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def switch_to_interface(self, server):
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'''Switch to server as our interface. If no connection exists nor
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being opened, start a thread to connect. The actual switch will
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happen on receipt of the connection notification. Do nothing
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if server already is our interface.'''
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self.default_server = server
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if server not in self.interfaces:
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self.interface = None
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self.start_interface(server)
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return
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i = self.interfaces[server]
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if self.interface != i:
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self.print_error("switching to", server)
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# stop any current interface in order to terminate subscriptions
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self.close_interface(self.interface)
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self.interface = i
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self.send_subscriptions()
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self.set_status('connected')
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self.notify('updated')
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|
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def close_interface(self, interface):
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if interface:
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self.interfaces.pop(interface.server)
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if interface.server == self.default_server:
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self.interface = None
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interface.close()
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|
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def add_recent_server(self, server):
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# list is ordered
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if server in self.recent_servers:
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self.recent_servers.remove(server)
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self.recent_servers.insert(0, server)
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self.recent_servers = self.recent_servers[0:20]
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self.save_recent_servers()
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|
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def process_response(self, interface, response, callbacks):
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if self.debug:
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self.print_error("<--", response)
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|
error = response.get('error')
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|
result = response.get('result')
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method = response.get('method')
|
|
params = response.get('params')
|
|
|
|
# We handle some responses; return the rest to the client.
|
|
if method == 'server.version':
|
|
interface.server_version = result
|
|
elif method == 'blockchain.headers.subscribe':
|
|
if error is None:
|
|
self.on_header(interface, result)
|
|
elif method == 'server.peers.subscribe':
|
|
if error is None:
|
|
self.irc_servers = parse_servers(result)
|
|
self.notify('servers')
|
|
elif method == 'server.banner':
|
|
if error is None:
|
|
self.banner = result
|
|
self.notify('banner')
|
|
elif method == 'server.donation_address':
|
|
if error is None:
|
|
self.donation_address = result
|
|
elif method == 'blockchain.estimatefee':
|
|
if error is None:
|
|
self.fee = int(result * COIN)
|
|
self.print_error("recommended fee", self.fee)
|
|
self.notify('fee')
|
|
elif method == 'blockchain.relayfee':
|
|
if error is None:
|
|
self.relay_fee = int(result * COIN)
|
|
self.print_error("relayfee", self.relay_fee)
|
|
elif method == 'blockchain.block.get_chunk':
|
|
self.on_get_chunk(interface, response)
|
|
elif method == 'blockchain.block.get_header':
|
|
self.on_get_header(interface, response)
|
|
|
|
for callback in callbacks:
|
|
callback(response)
|
|
|
|
def get_index(self, method, params):
|
|
""" hashable index for subscriptions and cache"""
|
|
return str(method) + (':' + str(params[0]) if params else '')
|
|
|
|
def process_responses(self, interface):
|
|
responses = interface.get_responses()
|
|
for request, response in responses:
|
|
if request:
|
|
method, params, message_id = request
|
|
k = self.get_index(method, params)
|
|
# client requests go through self.send() with a
|
|
# callback, are only sent to the current interface,
|
|
# and are placed in the unanswered_requests dictionary
|
|
client_req = self.unanswered_requests.pop(message_id, None)
|
|
if client_req:
|
|
assert interface == self.interface
|
|
callbacks = [client_req[2]]
|
|
else:
|
|
callbacks = []
|
|
# Copy the request method and params to the response
|
|
response['method'] = method
|
|
response['params'] = params
|
|
# Only once we've received a response to an addr subscription
|
|
# add it to the list; avoids double-sends on reconnection
|
|
if method == 'blockchain.address.subscribe':
|
|
self.subscribed_addresses.add(params[0])
|
|
else:
|
|
if not response: # Closed remotely / misbehaving
|
|
self.connection_down(interface.server)
|
|
break
|
|
# Rewrite response shape to match subscription request response
|
|
method = response.get('method')
|
|
params = response.get('params')
|
|
k = self.get_index(method, params)
|
|
if method == 'blockchain.headers.subscribe':
|
|
response['result'] = params[0]
|
|
response['params'] = []
|
|
elif method == 'blockchain.address.subscribe':
|
|
response['params'] = [params[0]] # addr
|
|
response['result'] = params[1]
|
|
callbacks = self.subscriptions.get(k, [])
|
|
|
|
# update cache if it's a subscription
|
|
if method.endswith('.subscribe'):
|
|
self.sub_cache[k] = response
|
|
# Response is now in canonical form
|
|
self.process_response(interface, response, callbacks)
|
|
|
|
def send(self, messages, callback):
|
|
'''Messages is a list of (method, params) tuples'''
|
|
with self.lock:
|
|
self.pending_sends.append((messages, callback))
|
|
|
|
def process_pending_sends(self):
|
|
# Requests needs connectivity. If we don't have an interface,
|
|
# we cannot process them.
|
|
if not self.interface:
|
|
return
|
|
|
|
with self.lock:
|
|
sends = self.pending_sends
|
|
self.pending_sends = []
|
|
|
|
for messages, callback in sends:
|
|
for method, params in messages:
|
|
r = None
|
|
if method.endswith('.subscribe'):
|
|
k = self.get_index(method, params)
|
|
# add callback to list
|
|
l = self.subscriptions.get(k, [])
|
|
if callback not in l:
|
|
l.append(callback)
|
|
self.subscriptions[k] = l
|
|
# check cached response for subscriptions
|
|
r = self.sub_cache.get(k)
|
|
if r is not None:
|
|
util.print_error("cache hit", k)
|
|
callback(r)
|
|
else:
|
|
message_id = self.queue_request(method, params)
|
|
self.unanswered_requests[message_id] = method, params, callback
|
|
|
|
def unsubscribe(self, callback):
|
|
'''Unsubscribe a callback to free object references to enable GC.'''
|
|
# Note: we can't unsubscribe from the server, so if we receive
|
|
# subsequent notifications process_response() will emit a harmless
|
|
# "received unexpected notification" warning
|
|
with self.lock:
|
|
for v in self.subscriptions.values():
|
|
if callback in v:
|
|
v.remove(callback)
|
|
|
|
def connection_down(self, server):
|
|
'''A connection to server either went down, or was never made.
|
|
We distinguish by whether it is in self.interfaces.'''
|
|
self.disconnected_servers.add(server)
|
|
if server == self.default_server:
|
|
self.set_status('disconnected')
|
|
if server in self.interfaces:
|
|
self.close_interface(self.interfaces[server])
|
|
self.heights.pop(server, None)
|
|
self.notify('interfaces')
|
|
|
|
def new_interface(self, server, socket):
|
|
self.add_recent_server(server)
|
|
self.interfaces[server] = interface = Interface(server, socket)
|
|
self.queue_request('blockchain.headers.subscribe', [], interface)
|
|
if server == self.default_server:
|
|
self.switch_to_interface(server)
|
|
self.notify('interfaces')
|
|
|
|
def maintain_sockets(self):
|
|
'''Socket maintenance.'''
|
|
# Responses to connection attempts?
|
|
while not self.socket_queue.empty():
|
|
server, socket = self.socket_queue.get()
|
|
self.connecting.remove(server)
|
|
if socket:
|
|
self.new_interface(server, socket)
|
|
else:
|
|
self.connection_down(server)
|
|
|
|
# Send pings and shut down stale interfaces
|
|
for interface in self.interfaces.values():
|
|
if interface.has_timed_out():
|
|
self.connection_down(interface.server)
|
|
elif interface.ping_required():
|
|
params = [ELECTRUM_VERSION, PROTOCOL_VERSION]
|
|
self.queue_request('server.version', params, interface)
|
|
|
|
now = time.time()
|
|
# nodes
|
|
if len(self.interfaces) + len(self.connecting) < 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:
|
|
if not self.is_connecting():
|
|
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 request_chunk(self, interface, data, idx):
|
|
interface.print_error("requesting chunk %d" % idx)
|
|
self.queue_request('blockchain.block.get_chunk', [idx], interface)
|
|
data['chunk_idx'] = idx
|
|
data['req_time'] = time.time()
|
|
|
|
def on_get_chunk(self, interface, response):
|
|
'''Handle receiving a chunk of block headers'''
|
|
if self.bc_requests:
|
|
req_if, data = self.bc_requests[0]
|
|
req_idx = data.get('chunk_idx')
|
|
# Ignore unsolicited chunks
|
|
if req_if == interface and req_idx == response['params'][0]:
|
|
idx = self.blockchain.connect_chunk(req_idx, response['result'])
|
|
# If not finished, get the next chunk
|
|
if idx < 0 or self.get_local_height() >= data['if_height']:
|
|
self.bc_requests.popleft()
|
|
self.notify('updated')
|
|
else:
|
|
self.request_chunk(interface, data, idx)
|
|
|
|
def request_header(self, interface, data, height):
|
|
interface.print_error("requesting header %d" % height)
|
|
self.queue_request('blockchain.block.get_header', [height], interface)
|
|
data['header_height'] = height
|
|
data['req_time'] = time.time()
|
|
if not 'chain' in data:
|
|
data['chain'] = []
|
|
|
|
def on_get_header(self, interface, response):
|
|
'''Handle receiving a single block header'''
|
|
if self.bc_requests:
|
|
req_if, data = self.bc_requests[0]
|
|
req_height = data.get('header_height', -1)
|
|
# Ignore unsolicited headers
|
|
if req_if == interface and req_height == response['params'][0]:
|
|
next_height = self.blockchain.connect_header(data['chain'], response['result'])
|
|
# If not finished, get the next header
|
|
if next_height in [True, False]:
|
|
self.bc_requests.popleft()
|
|
if next_height:
|
|
self.switch_lagging_interface(interface.server)
|
|
self.notify('updated')
|
|
else:
|
|
interface.print_error("header didn't connect, dismissing interface")
|
|
interface.stop()
|
|
else:
|
|
self.request_header(interface, data, next_height)
|
|
|
|
def bc_request_headers(self, interface, data):
|
|
'''Send a request for the next header, or a chunk of them,
|
|
if necessary.
|
|
'''
|
|
local_height, if_height = self.get_local_height(), data['if_height']
|
|
if if_height <= local_height:
|
|
return False
|
|
elif if_height > local_height + 50:
|
|
self.request_chunk(interface, data, (local_height + 1) / 2016)
|
|
else:
|
|
self.request_header(interface, data, if_height)
|
|
return True
|
|
|
|
def handle_bc_requests(self):
|
|
'''Work through each interface that has notified us of a new header.
|
|
Send it requests if it is ahead of our blockchain object.
|
|
'''
|
|
while self.bc_requests:
|
|
interface, data = self.bc_requests.popleft()
|
|
# If the connection was lost move on
|
|
if not interface in self.interfaces.values():
|
|
continue
|
|
|
|
req_time = data.get('req_time')
|
|
if not req_time:
|
|
# No requests sent yet. This interface has a new height.
|
|
# Request headers if it is ahead of our blockchain
|
|
if not self.bc_request_headers(interface, data):
|
|
continue
|
|
elif time.time() - req_time > 10:
|
|
interface.print_error("blockchain request timed out")
|
|
self.connection_down(interface.server)
|
|
continue
|
|
# Put updated request state back at head of deque
|
|
self.bc_requests.appendleft((interface, data))
|
|
break
|
|
|
|
def wait_on_sockets(self):
|
|
# Python docs say Windows doesn't like empty selects.
|
|
# Sleep to prevent busy looping
|
|
if not self.interfaces:
|
|
time.sleep(0.1)
|
|
return
|
|
rin = [i for i in self.interfaces.values()]
|
|
win = [i for i in self.interfaces.values() if i.unsent_requests]
|
|
try:
|
|
rout, wout, xout = select.select(rin, win, [], 0.1)
|
|
except socket.error as (code, msg):
|
|
if code == errno.EINTR:
|
|
return
|
|
raise
|
|
assert not xout
|
|
for interface in wout:
|
|
interface.send_requests()
|
|
for interface in rout:
|
|
self.process_responses(interface)
|
|
|
|
def run(self):
|
|
self.blockchain.init()
|
|
while self.is_running():
|
|
self.maintain_sockets()
|
|
self.wait_on_sockets()
|
|
self.handle_bc_requests()
|
|
self.run_jobs() # Synchronizer and Verifier
|
|
self.process_pending_sends()
|
|
|
|
self.stop_network()
|
|
self.print_error("stopped")
|
|
|
|
def on_header(self, i, header):
|
|
height = header.get('block_height')
|
|
if not height:
|
|
return
|
|
self.heights[i.server] = height
|
|
self.merkle_roots[i.server] = header.get('merkle_root')
|
|
self.utxo_roots[i.server] = header.get('utxo_root')
|
|
|
|
# Queue this interface's height for asynchronous catch-up
|
|
self.bc_requests.append((i, {'if_height': height}))
|
|
|
|
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()
|
|
|
|
def synchronous_get(self, request, timeout=100000000):
|
|
queue = Queue.Queue()
|
|
self.send([request], queue.put)
|
|
r = queue.get(True, timeout)
|
|
if r.get('error'):
|
|
raise BaseException(r.get('error'))
|
|
return r.get('result')
|