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# Electrum - Lightweight Bitcoin Client
# Copyright (c) 2011-2016 Thomas Voegtlin
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import time
import Queue
import os
import errno
import sys
import random
import select
import traceback
from collections import defaultdict, deque
from threading import Lock
import socks
import socket
import json
import util
import bitcoin
from bitcoin import *
from interface import Connection, Interface
from blockchain import Blockchain
from version import ELECTRUM_VERSION, PROTOCOL_VERSION
DEFAULT_PORTS = {'t':'50001', 's':'50002'}
DEFAULT_SERVERS = {
'erbium1.sytes.net':{'t':'50001', 's':'50002'},
'ecdsa.net':{'t':'50001', 's':'110'},
'gh05.geekhosters.com':{'t':'50001', 's':'50002'},
'VPS.hsmiths.com':{'t':'50001', 's':'50002'},
'electrum.anduck.net':{'t':'50001', 's':'50002'},
'electrum.no-ip.org':{'t':'50001', 's':'50002'},
'us.electrum.be':DEFAULT_PORTS,
'electrum.villocq.com':{'t':'50001', 's':'50002'},
'us10.einfachmalnettsein.de':{'t':'50001', 's':'50002'},
'electrum.trouth.net':{'t':'50001', 's':'50002'},
'Electrum.hsmiths.com':{'t':'8080', 's':'995'},
'electrum3.hachre.de':{'t':'50001', 's':'50002'},
'elec.luggs.co':{'t':'80', 's':'443'},
'btc.smsys.me':{'t':'110', 's':'995'},
'btc.mustyoshi.com':{'t':'50001', 's':'50002'},
}
def set_testnet():
global DEFAULT_PORTS, DEFAULT_SERVERS
DEFAULT_PORTS = {'t':'51001', 's':'51002'}
DEFAULT_SERVERS = {
'14.3.140.101': DEFAULT_PORTS,
'testnet.not.fyi': 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("[st]\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 = cmp(util.normalize_version(version), util.normalize_version(PROTOCOL_VERSION)) >= 0
except Exception:
is_recent = False
if out and is_recent:
out['pruning'] = pruning_level
servers[host] = out
return servers
def filter_protocol(hostmap, 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 = None, protocol = 's', exclude_set = set()):
if hostmap is None:
hostmap = DEFAULT_SERVERS
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'), p.get('user'), p.get('password')])
def deserialize_proxy(s):
if type(s) not in [str, unicode]:
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]
n += 1
else:
proxy["port"] = "8080" if proxy["mode"] == "http" else "1080"
if len(args) > n:
proxy["user"] = args[n]
n += 1
if len(args) > n:
proxy["password"] = args[n]
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 connected socket is handled by an Interface() object.
Connections are initiated by a Connection() thread which stops once
the connection succeeds or fails.
Our external API:
- Member functions get_header(), get_interfaces(), get_local_height(),
get_parameters(), get_server_height(), get_status_value(),
is_connected(), set_parameters(), stop()
"""
def __init__(self, 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)
# A deque of interface header requests, processed left-to-right
self.bc_requests = deque()
# 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.lock = Lock()
self.pending_sends = []
self.message_id = 0
self.debug = False
self.irc_servers = {} # returned by interface (list from irc)
self.recent_servers = self.read_recent_servers()
self.banner = ''
self.donation_address = ''
self.relay_fee = None
self.heights = {}
self.merkle_roots = {}
self.utxo_roots = {}
# callbacks passed with subscriptions
self.subscriptions = defaultdict(list)
self.sub_cache = {}
# callbacks set by the GUI
self.callbacks = defaultdict(list)
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()
# Requests from client we've not seen a response to
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.auto_connect = self.config.get('auto_connect', True)
self.connecting = set()
self.socket_queue = Queue.Queue()
self.start_network(deserialize_server(self.default_server)[2],
deserialize_proxy(self.config.get('proxy')))
def register_callback(self, callback, events):
with self.lock:
for event in events:
self.callbacks[event].append(callback)
def unregister_callback(self, callback):
with self.lock:
for callbacks in self.callbacks.values():
if callback in callbacks:
callbacks.remove(callback)
def trigger_callback(self, event, *args):
with self.lock:
callbacks = self.callbacks[event][:]
[callback(event, *args) for callback in callbacks]
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 True
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 is not None
def is_connecting(self):
return self.connection_status == 'connecting'
def is_up_to_date(self):
return self.unanswered_requests == {}
def queue_request(self, method, params, interface=None):
# If you want to queue a request on any interface it must go
# through this function so message ids are properly tracked
if interface is None:
interface = self.interface
message_id = self.message_id
self.message_id += 1
if self.debug:
self.print_error(interface.host, "-->", method, params, message_id)
interface.queue_request(method, params, message_id)
return message_id
def send_subscriptions(self):
self.print_error('sending subscriptions to', self.interface.server, len(self.unanswered_requests), len(self.subscribed_addresses))
self.sub_cache.clear()
# Resend unanswered requests
requests = self.unanswered_requests.values()
self.unanswered_requests = {}
for request in requests:
message_id = self.queue_request(request[0], request[1])
self.unanswered_requests[message_id] = request
for addr in self.subscribed_addresses:
self.queue_request('blockchain.address.subscribe', [addr])
self.queue_request('server.banner', [])
self.queue_request('server.donation_address', [])
self.queue_request('server.peers.subscribe', [])
for i in bitcoin.FEE_TARGETS:
self.queue_request('blockchain.estimatefee', [i])
self.queue_request('blockchain.relayfee', [])
def get_status_value(self, key):
if key == 'status':
value = self.connection_status
elif key == 'banner':
value = self.banner
elif key == 'fee':
value = self.config.fee_estimates
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):
if key in ['status', 'updated']:
self.trigger_callback(key)
else:
self.trigger_callback(key, self.get_status_value(key))
def get_parameters(self):
host, port, protocol = deserialize_server(self.default_server)
return host, port, protocol, self.proxy, self.auto_connect
def get_donation_address(self):
if self.is_connected():
return self.donation_address
def get_interfaces(self):
'''The interfaces that are in connected state'''
return self.interfaces.keys()
def get_servers(self):
if self.irc_servers:
out = self.irc_servers.copy()
out.update(DEFAULT_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 and not server in self.connecting):
if server == self.default_server:
self.print_error("connecting to %s as new interface" % server)
self.set_status('connecting')
self.connecting.add(server)
c = Connection(server, self.socket_queue, self.config.path)
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 set_proxy(self, proxy):
self.proxy = proxy
if proxy:
self.print_error('setting proxy', proxy)
proxy_mode = proxy_modes.index(proxy["mode"]) + 1
socks.setdefaultproxy(proxy_mode,
proxy["host"],
int(proxy["port"]),
# socks.py seems to want either None or a non-empty string
username=(proxy.get("user", "") or None),
password=(proxy.get("password", "") or None))
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
assert not self.connecting and self.socket_queue.empty()
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 interface in self.interfaces.values():
self.close_interface(interface)
assert self.interface is None
assert not self.interfaces
self.connecting = set()
# Get a new queue - no old pending connections thanks!
self.socket_queue = Queue.Queue()
def set_parameters(self, host, port, protocol, proxy, auto_connect):
proxy_str = serialize_proxy(proxy)
server = serialize_server(host, port, protocol)
self.config.set_key('auto_connect', auto_connect, False)
self.config.set_key("proxy", proxy_str, False)
self.config.set_key("server", server, True)
# abort if changes were not allowed by config
if self.config.get('server') != server or self.config.get('proxy') != proxy_str:
return
self.auto_connect = auto_connect
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):
'''Switch to a random connected server other than the current one'''
servers = self.get_interfaces() # Those in connected state
if self.default_server in servers:
servers.remove(self.default_server)
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.interface = None
self.start_interface(server)
return
i = self.interfaces[server]
if self.interface != i:
self.print_error("switching to", server)
# stop any current interface in order to terminate subscriptions
self.close_interface(self.interface)
self.interface = i
self.send_subscriptions()
self.set_status('connected')
self.notify('updated')
def close_interface(self, interface):
if interface:
self.interfaces.pop(interface.server)
if interface.server == self.default_server:
self.interface = None
interface.close()
def add_recent_server(self, server):
# list is ordered
if server in self.recent_servers:
self.recent_servers.remove(server)
self.recent_servers.insert(0, server)
self.recent_servers = self.recent_servers[0:20]
self.save_recent_servers()
def process_response(self, interface, response, callbacks):
if self.debug:
self.print_error("<--", response)
error = response.get('error')
result = response.get('result')
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:
i = params[0]
self.config.fee_estimates[i] = int(result * COIN)
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.blockchain.downloading_headers:
return
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.
'''
if self.blockchain.downloading_headers:
return False
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 > 20:
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.num_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.on_stop()
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=30):
queue = Queue.Queue()
self.send([request], queue.put)
try:
r = queue.get(True, timeout)
except Queue.Empty:
raise BaseException('Server did not answer')
if r.get('error'):
raise BaseException(r.get('error'))
return r.get('result')
def broadcast(self, tx, timeout=30):
tx_hash = tx.txid()
try:
out = self.synchronous_get(('blockchain.transaction.broadcast', [str(tx)]), timeout)
except BaseException as e:
return False, "error: " + str(e)
if out != tx_hash:
return False, "error: " + out
return True, out