class Daemon(Logger):
network: Optional[Network]
@profiler
def __init__(self, config: SimpleConfig, fd=None, *, listen_jsonrpc=True):
Logger.__init__(self)
self.running = False
self.running_lock = threading.Lock()
self.config = config
if fd is None and listen_jsonrpc:
fd = get_file_descriptor(config)
if fd is None:
raise Exception('failed to lock daemon; already running?')
self.asyncio_loop = asyncio.get_event_loop()
self.network = None
if not config.get('offline'):
self.network = Network(config, daemon=self)
self.fx = FxThread(config, self.network)
self.gui_object = None
# path -> wallet; make sure path is standardized.
self._wallets = {} # type: Dict[str, Abstract_Wallet]
daemon_jobs = []
# Setup commands server
self.commands_server = None
if listen_jsonrpc:
self.commands_server = CommandsServer(self, fd)
daemon_jobs.append(self.commands_server.run())
# pay server
self.pay_server = None
payserver_address = self.config.get_netaddress('payserver_address')
if not config.get('offline') and payserver_address:
self.pay_server = PayServer(self, payserver_address)
daemon_jobs.append(self.pay_server.run())
# server-side watchtower
self.watchtower = None
watchtower_address = self.config.get_netaddress('watchtower_address')
if not config.get('offline') and watchtower_address:
self.watchtower = WatchTowerServer(self.network,
watchtower_address)
daemon_jobs.append(self.watchtower.run)
if self.network:
self.network.start(jobs=[self.fx.run])
self.taskgroup = TaskGroup()
asyncio.run_coroutine_threadsafe(self._run(jobs=daemon_jobs),
self.asyncio_loop)
@log_exceptions
async def _run(self, jobs: Iterable = None):
if jobs is None:
jobs = []
self.logger.info("starting taskgroup.")
try:
async with self.taskgroup as group:
[await group.spawn(job) for job in jobs]
await group.spawn(asyncio.Event().wait
) # run forever (until cancel)
except asyncio.CancelledError:
raise
except Exception as e:
self.logger.exception("taskgroup died.")
finally:
self.logger.info("taskgroup stopped.")
def load_wallet(self,
path,
password,
*,
manual_upgrades=True) -> Optional[Abstract_Wallet]:
path = standardize_path(path)
# wizard will be launched if we return
if path in self._wallets:
wallet = self._wallets[path]
return wallet
storage = WalletStorage(path)
if not storage.file_exists():
return
if storage.is_encrypted():
if not password:
return
storage.decrypt(password)
# read data, pass it to db
db = WalletDB(storage.read(), manual_upgrades=manual_upgrades)
if db.requires_split():
return
if db.requires_upgrade():
return
if db.get_action():
return
wallet = Wallet(db, storage, config=self.config)
wallet.start_network(self.network)
self._wallets[path] = wallet
return wallet
def add_wallet(self, wallet: Abstract_Wallet) -> None:
path = wallet.storage.path
path = standardize_path(path)
self._wallets[path] = wallet
def get_wallet(self, path: str) -> Optional[Abstract_Wallet]:
path = standardize_path(path)
return self._wallets.get(path)
def get_wallets(self) -> Dict[str, Abstract_Wallet]:
return dict(self._wallets) # copy
def delete_wallet(self, path: str) -> bool:
self.stop_wallet(path)
if os.path.exists(path):
os.unlink(path)
return True
return False
def stop_wallet(self, path: str) -> bool:
"""Returns True iff a wallet was found."""
path = standardize_path(path)
wallet = self._wallets.pop(path, None)
if not wallet:
return False
wallet.stop()
return True
def run_daemon(self):
self.running = True
try:
while self.is_running():
time.sleep(0.1)
except KeyboardInterrupt:
self.running = False
self.on_stop()
def is_running(self):
with self.running_lock:
return self.running and not self.taskgroup.closed()
def stop(self):
with self.running_lock:
self.running = False
def on_stop(self):
if self.gui_object:
self.gui_object.stop()
# stop network/wallets
for k, wallet in self._wallets.items():
wallet.stop()
if self.network:
self.logger.info("shutting down network")
self.network.stop()
self.logger.info("stopping taskgroup")
fut = asyncio.run_coroutine_threadsafe(
self.taskgroup.cancel_remaining(), self.asyncio_loop)
try:
fut.result(timeout=2)
except (concurrent.futures.TimeoutError,
concurrent.futures.CancelledError, asyncio.CancelledError):
pass
self.logger.info("removing lockfile")
remove_lockfile(get_lockfile(self.config))
self.logger.info("stopped")
def run_gui(self, config, plugins):
threading.current_thread().setName('GUI')
gui_name = config.get('gui', 'qt')
if gui_name in ['lite', 'classic']:
gui_name = 'qt'
self.logger.info(f'launching GUI: {gui_name}')
try:
gui = __import__('electrum.gui.' + gui_name, fromlist=['electrum'])
self.gui_object = gui.ElectrumGui(config, self, plugins)
self.gui_object.main()
except BaseException as e:
self.logger.error(
f'GUI raised exception: {repr(e)}. shutting down.')
raise
finally:
# app will exit now
self.on_stop()
class Daemon(Logger):
@profiler
def __init__(self, config: SimpleConfig, fd=None, *, listen_jsonrpc=True):
Logger.__init__(self)
self.auth_lock = asyncio.Lock()
self.running = False
self.running_lock = threading.Lock()
self.config = config
if fd is None and listen_jsonrpc:
fd = get_file_descriptor(config)
if fd is None:
raise Exception('failed to lock daemon; already running?')
self.asyncio_loop = asyncio.get_event_loop()
self.network = None
if not config.get('offline'):
self.network = Network(config, daemon=self)
self.fx = FxThread(config, self.network)
self.gui_object = None
# path -> wallet; make sure path is standardized.
self._wallets = {} # type: Dict[str, Abstract_Wallet]
daemon_jobs = []
# Setup JSONRPC server
if listen_jsonrpc:
daemon_jobs.append(self.start_jsonrpc(config, fd))
# request server
self.pay_server = None
if not config.get('offline') and self.config.get('run_payserver'):
self.pay_server = PayServer(self)
daemon_jobs.append(self.pay_server.run())
# server-side watchtower
self.watchtower = None
if not config.get('offline') and self.config.get('run_watchtower'):
self.watchtower = WatchTowerServer(self.network)
daemon_jobs.append(self.watchtower.run)
if self.network:
self.network.start(jobs=[self.fx.run])
self.taskgroup = TaskGroup()
asyncio.run_coroutine_threadsafe(self._run(jobs=daemon_jobs),
self.asyncio_loop)
@log_exceptions
async def _run(self, jobs: Iterable = None):
if jobs is None:
jobs = []
try:
async with self.taskgroup as group:
[await group.spawn(job) for job in jobs]
await group.spawn(asyncio.Event().wait
) # run forever (until cancel)
except BaseException as e:
self.logger.exception('daemon.taskgroup died.')
finally:
self.logger.info("stopping daemon.taskgroup")
async def authenticate(self, headers):
if self.rpc_password == '':
# RPC authentication is disabled
return
auth_string = headers.get('Authorization', None)
if auth_string is None:
raise AuthenticationInvalidOrMissing('CredentialsMissing')
basic, _, encoded = auth_string.partition(' ')
if basic != 'Basic':
raise AuthenticationInvalidOrMissing('UnsupportedType')
encoded = to_bytes(encoded, 'utf8')
credentials = to_string(b64decode(encoded), 'utf8')
username, _, password = credentials.partition(':')
if not (constant_time_compare(username, self.rpc_user)
and constant_time_compare(password, self.rpc_password)):
await asyncio.sleep(0.050)
raise AuthenticationCredentialsInvalid('Invalid Credentials')
async def handle(self, request):
async with self.auth_lock:
try:
await self.authenticate(request.headers)
except AuthenticationInvalidOrMissing:
return web.Response(
headers={"WWW-Authenticate": "Basic realm=Electrum"},
text='Unauthorized',
status=401)
except AuthenticationCredentialsInvalid:
return web.Response(text='Forbidden', status=403)
request = await request.text()
response = await jsonrpcserver.async_dispatch(request,
methods=self.methods)
if isinstance(response, jsonrpcserver.response.ExceptionResponse):
self.logger.error(f"error handling request: {request}",
exc_info=response.exc)
# this exposes the error message to the client
response.message = str(response.exc)
if response.wanted:
return web.json_response(response.deserialized(),
status=response.http_status)
else:
return web.Response()
async def start_jsonrpc(self, config: SimpleConfig, fd):
self.app = web.Application()
self.app.router.add_post("/", self.handle)
self.rpc_user, self.rpc_password = get_rpc_credentials(config)
self.methods = jsonrpcserver.methods.Methods()
self.methods.add(self.ping)
self.methods.add(self.gui)
self.cmd_runner = Commands(config=self.config,
network=self.network,
daemon=self)
for cmdname in known_commands:
self.methods.add(getattr(self.cmd_runner, cmdname))
self.methods.add(self.run_cmdline)
self.host = config.get('rpchost', '127.0.0.1')
self.port = config.get('rpcport', 0)
self.runner = web.AppRunner(self.app)
await self.runner.setup()
site = web.TCPSite(self.runner, self.host, self.port)
await site.start()
socket = site._server.sockets[0]
os.write(fd, bytes(repr((socket.getsockname(), time.time())), 'utf8'))
os.close(fd)
async def ping(self):
return True
async def gui(self, config_options):
if self.gui_object:
if hasattr(self.gui_object, 'new_window'):
path = self.config.get_wallet_path(use_gui_last_wallet=True)
self.gui_object.new_window(path, config_options.get('url'))
response = "ok"
else:
response = "error: current GUI does not support multiple windows"
else:
response = "Error: Electrum is running in daemon mode. Please stop the daemon first."
return response
def load_wallet(self,
path,
password,
*,
manual_upgrades=True) -> Optional[Abstract_Wallet]:
path = standardize_path(path)
# wizard will be launched if we return
if path in self._wallets:
wallet = self._wallets[path]
return wallet
storage = WalletStorage(path)
if not storage.file_exists():
return
if storage.is_encrypted():
if not password:
return
storage.decrypt(password)
# read data, pass it to db
db = WalletDB(storage.read(), manual_upgrades=manual_upgrades)
if db.requires_split():
return
if db.requires_upgrade():
return
if db.get_action():
return
wallet = Wallet(db, storage, config=self.config)
wallet.start_network(self.network)
self._wallets[path] = wallet
self.wallet = wallet
return wallet
def add_wallet(self, wallet: Abstract_Wallet) -> None:
path = wallet.storage.path
path = standardize_path(path)
self._wallets[path] = wallet
def get_wallet(self, path: str) -> Abstract_Wallet:
path = standardize_path(path)
return self._wallets.get(path)
def get_wallets(self) -> Dict[str, Abstract_Wallet]:
return dict(self._wallets) # copy
def delete_wallet(self, path: str) -> bool:
self.stop_wallet(path)
if os.path.exists(path):
os.unlink(path)
return True
return False
def stop_wallet(self, path: str) -> bool:
"""Returns True iff a wallet was found."""
path = standardize_path(path)
wallet = self._wallets.pop(path, None)
if not wallet:
return False
wallet.stop_threads()
return True
async def run_cmdline(self, config_options):
cmdname = config_options['cmd']
cmd = known_commands[cmdname]
# arguments passed to function
args = [config_options.get(x) for x in cmd.params]
# decode json arguments
args = [json_decode(i) for i in args]
# options
kwargs = {}
for x in cmd.options:
kwargs[x] = config_options.get(x)
if cmd.requires_wallet:
kwargs['wallet_path'] = config_options.get('wallet_path')
func = getattr(self.cmd_runner, cmd.name)
# fixme: not sure how to retrieve message in jsonrpcclient
try:
result = await func(*args, **kwargs)
except Exception as e:
result = {'error': str(e)}
return result
def run_daemon(self):
self.running = True
try:
while self.is_running():
time.sleep(0.1)
except KeyboardInterrupt:
self.running = False
self.on_stop()
def is_running(self):
with self.running_lock:
return self.running and not self.taskgroup.closed()
def stop(self):
with self.running_lock:
self.running = False
def on_stop(self):
if self.gui_object:
self.gui_object.stop()
# stop network/wallets
for k, wallet in self._wallets.items():
wallet.stop_threads()
if self.network:
self.logger.info("shutting down network")
self.network.stop()
self.logger.info("stopping taskgroup")
fut = asyncio.run_coroutine_threadsafe(
self.taskgroup.cancel_remaining(), self.asyncio_loop)
try:
fut.result(timeout=2)
except (asyncio.TimeoutError, asyncio.CancelledError):
pass
self.logger.info("removing lockfile")
remove_lockfile(get_lockfile(self.config))
self.logger.info("stopped")
def run_gui(self, config, plugins):
threading.current_thread().setName('GUI')
gui_name = config.get('gui', 'qt')
if gui_name in ['lite', 'classic']:
gui_name = 'qt'
self.logger.info(f'launching GUI: {gui_name}')
try:
gui = __import__('electrum.gui.' + gui_name, fromlist=['electrum'])
self.gui_object = gui.ElectrumGui(config, self, plugins)
self.gui_object.main()
except BaseException as e:
self.logger.error(
f'GUI raised exception: {repr(e)}. shutting down.')
raise
finally:
# app will exit now
self.on_stop()
class Network(PrintError):
"""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()
"""
verbosity_filter = 'n'
def __init__(self, config=None):
global INSTANCE
INSTANCE = self
if config is None:
config = {} # Do not use mutables as default values!
self.config = SimpleConfig(config) if isinstance(config,
dict) else config
self.num_server = 10 if not self.config.get('oneserver') else 0
blockchain.blockchains = blockchain.read_blockchains(
self.config) # note: needs self.blockchains_lock
self.print_error("blockchains", list(blockchain.blockchains.keys()))
self.blockchain_index = config.get('blockchain_index', 0)
if self.blockchain_index not in blockchain.blockchains.keys():
self.blockchain_index = 0
# Server for addresses and transactions
self.default_server = self.config.get('server', None)
# Sanitize default server
if self.default_server:
try:
deserialize_server(self.default_server)
except:
self.print_error(
'Warning: failed to parse server-string; falling back to random.'
)
self.default_server = None
if not self.default_server:
self.default_server = pick_random_server()
# locks: if you need to take multiple ones, acquire them in the order they are defined here!
self.bhi_lock = asyncio.Lock()
self.interface_lock = threading.RLock() # <- re-entrant
self.callback_lock = threading.Lock()
self.recent_servers_lock = threading.RLock() # <- re-entrant
self.blockchains_lock = threading.Lock()
self.irc_servers = {} # returned by interface (list from irc)
self.recent_servers = self.read_recent_servers(
) # note: needs self.recent_servers_lock
self.banner = ''
self.donation_address = ''
self.relay_fee = None
# callbacks set by the GUI
self.callbacks = defaultdict(list) # note: needs self.callback_lock
dir_path = os.path.join(self.config.path, 'certs')
util.make_dir(dir_path)
# 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 # note: needs self.interface_lock
self.interfaces = {} # note: needs self.interface_lock
self.auto_connect = self.config.get('auto_connect', True)
self.connecting = set()
self.requested_chunks = set()
self.socket_queue = queue.Queue()
self.start_network(
deserialize_server(self.default_server)[2],
deserialize_proxy(self.config.get('proxy')))
self.asyncio_loop = asyncio.get_event_loop()
@staticmethod
def get_instance():
return INSTANCE
def with_interface_lock(func):
def func_wrapper(self, *args, **kwargs):
with self.interface_lock:
return func(self, *args, **kwargs)
return func_wrapper
def with_recent_servers_lock(func):
def func_wrapper(self, *args, **kwargs):
with self.recent_servers_lock:
return func(self, *args, **kwargs)
return func_wrapper
def register_callback(self, callback, events):
with self.callback_lock:
for event in events:
self.callbacks[event].append(callback)
def unregister_callback(self, callback):
with self.callback_lock:
for callbacks in self.callbacks.values():
if callback in callbacks:
callbacks.remove(callback)
def trigger_callback(self, event, *args):
with self.callback_lock:
callbacks = self.callbacks[event][:]
for callback in callbacks:
if asyncio.iscoroutinefunction(callback):
# FIXME: if callback throws, we will lose the traceback
asyncio.run_coroutine_threadsafe(callback(event, *args),
self.asyncio_loop)
else:
callback(event, *args)
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", encoding='utf-8') as f:
data = f.read()
return json.loads(data)
except:
return []
@with_recent_servers_lock
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", encoding='utf-8') as f:
f.write(s)
except:
pass
@with_interface_lock
def get_server_height(self):
return self.interface.tip if self.interface else 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 and self.interface.ready.done()
def is_connecting(self):
return self.connection_status == 'connecting'
async def request_server_info(self, interface):
await interface.ready
session = interface.session
self.banner = await session.send_request('server.banner')
self.notify('banner')
self.donation_address = await session.send_request(
'server.donation_address')
self.irc_servers = parse_servers(
await session.send_request('server.peers.subscribe'))
self.notify('servers')
await self.request_fee_estimates(interface)
relayfee = await session.send_request('blockchain.relayfee')
self.relay_fee = int(relayfee * COIN) if relayfee is not None else None
async def request_fee_estimates(self, interface):
session = interface.session
from .simple_config import FEE_ETA_TARGETS
self.config.requested_fee_estimates()
async with TaskGroup() as group:
histogram_task = await group.spawn(
session.send_request('mempool.get_fee_histogram'))
fee_tasks = []
for i in FEE_ETA_TARGETS:
fee_tasks.append((i, await group.spawn(
session.send_request('blockchain.estimatefee', [i]))))
self.config.mempool_fees = histogram_task.result()
self.notify('fee_histogram')
for i, task in fee_tasks:
fee = int(task.result() * COIN)
self.config.update_fee_estimates(i, fee)
self.print_error("fee_estimates[%d]" % i, fee)
self.notify('fee')
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 == 'fee_histogram':
value = self.config.mempool_fees
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) -> NetworkParameters:
host, port, protocol = deserialize_server(self.default_server)
return NetworkParameters(host, port, protocol, self.proxy,
self.auto_connect)
def get_donation_address(self):
if self.is_connected():
return self.donation_address
@with_interface_lock
def get_interfaces(self):
'''The interfaces that are in connected state'''
return list(self.interfaces.keys())
@with_recent_servers_lock
def get_servers(self):
out = constants.net.DEFAULT_SERVERS
if self.irc_servers:
out.update(filter_version(self.irc_servers.copy()))
else:
for s in self.recent_servers:
try:
host, port, protocol = deserialize_server(s)
except:
continue
if host not in out:
out[host] = {protocol: port}
if self.config.get('noonion'):
out = filter_noonion(out)
return out
@with_interface_lock
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)
self.socket_queue.put(server)
def start_random_interface(self):
with self.interface_lock:
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)
return server
def set_proxy(self, proxy: Optional[dict]):
self.proxy = proxy
# Store these somewhere so we can un-monkey-patch
if not hasattr(socket, "_getaddrinfo"):
socket._getaddrinfo = socket.getaddrinfo
if proxy:
self.print_error('setting proxy', proxy)
# 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:
if sys.platform == 'win32':
# On Windows, socket.getaddrinfo takes a mutex, and might hold it for up to 10 seconds
# when dns-resolving. To speed it up drastically, we resolve dns ourselves, outside that lock.
# see #4421
socket.getaddrinfo = self._fast_getaddrinfo
else:
socket.getaddrinfo = socket._getaddrinfo
self.trigger_callback('proxy_set', self.proxy)
@staticmethod
def _fast_getaddrinfo(host, *args, **kwargs):
def needs_dns_resolving(host2):
try:
ipaddress.ip_address(host2)
return False # already valid IP
except ValueError:
pass # not an IP
if str(host) in (
'localhost',
'localhost.',
):
return False
return True
try:
if needs_dns_resolving(host):
answers = dns.resolver.query(host)
addr = str(answers[0])
else:
addr = host
except dns.exception.DNSException:
# dns failed for some reason, e.g. dns.resolver.NXDOMAIN
# this is normal. Simply report back failure:
raise socket.gaierror(11001, 'getaddrinfo failed')
except BaseException as e:
# Possibly internal error in dnspython :( see #4483
# Fall back to original socket.getaddrinfo to resolve dns.
print_error('dnspython failed to resolve dns with error:', e)
addr = host
return socket._getaddrinfo(addr, *args, **kwargs)
@with_interface_lock
def start_network(self, protocol: str, proxy: Optional[dict]):
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([]) # note: needs self.interface_lock
self.protocol = protocol
self.set_proxy(proxy)
self.start_interface(self.default_server)
@with_interface_lock
def stop_network(self):
self.print_error("stopping network")
for interface in list(self.interfaces.values()):
self.close_interface(interface)
if self.interface:
self.close_interface(self.interface)
assert self.interface is None
assert not self.interfaces
self.connecting.clear()
# Get a new queue - no old pending connections thanks!
self.socket_queue = queue.Queue()
def set_parameters(self, net_params: NetworkParameters):
proxy = net_params.proxy
proxy_str = serialize_proxy(proxy)
host, port, protocol = net_params.host, net_params.port, net_params.protocol
server_str = serialize_server(host, port, protocol)
# sanitize parameters
try:
deserialize_server(serialize_server(host, port, protocol))
if proxy:
proxy_modes.index(proxy["mode"]) + 1
int(proxy['port'])
except:
return
self.config.set_key('auto_connect', net_params.auto_connect, False)
self.config.set_key("proxy", proxy_str, False)
self.config.set_key("server", server_str, True)
# abort if changes were not allowed by config
if self.config.get('server') != server_str or self.config.get(
'proxy') != proxy_str:
return
self.auto_connect = net_params.auto_connect
if self.proxy != proxy or self.protocol != protocol:
# Restart the network defaulting to the given server
with self.interface_lock:
self.stop_network()
self.default_server = server_str
self.start_network(protocol, proxy)
elif self.default_server != server_str:
self.switch_to_interface(server_str)
else:
self.switch_lagging_interface()
self.notify('updated')
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))
@with_interface_lock
def switch_lagging_interface(self):
'''If auto_connect and lagging, switch interface'''
if self.server_is_lagging() and self.auto_connect:
# switch to one that has the correct header (not height)
header = self.blockchain().read_header(self.get_local_height())
def filt(x):
a = x[1].tip_header
b = header
assert type(a) is type(b)
return a == b
filtered = list(
map(lambda x: x[0], filter(filt, self.interfaces.items())))
if filtered:
choice = random.choice(filtered)
self.switch_to_interface(choice)
@with_interface_lock
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)
if self.interface is not None:
# Stop any current interface in order to terminate subscriptions,
# and to cancel tasks in interface.group.
# However, for headers sub, give preference to this interface
# over unknown ones, i.e. start it again right away.
old_server = self.interface.server
self.close_interface(self.interface)
if len(self.interfaces) <= self.num_server:
self.start_interface(old_server)
self.interface = i
asyncio.get_event_loop().create_task(
i.group.spawn(self.request_server_info(i)))
self.trigger_callback('default_server_changed')
self.set_status('connected')
self.notify('updated')
self.notify('interfaces')
@with_interface_lock
def close_interface(self, interface):
if interface:
if interface.server in self.interfaces:
self.interfaces.pop(interface.server)
if interface.server == self.default_server:
self.interface = None
interface.close()
@with_recent_servers_lock
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()
@with_interface_lock
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.notify('interfaces')
@aiosafe
async def new_interface(self, server):
# todo: get tip first, then decide which checkpoint to use.
self.add_recent_server(server)
interface = Interface(self, server, self.config.path, self.proxy)
timeout = 10 if not self.proxy else 20
try:
await asyncio.wait_for(interface.ready, timeout)
except BaseException as e:
#import traceback
#traceback.print_exc()
self.print_error(interface.server, "couldn't launch because",
str(e), str(type(e)))
self.connection_down(interface.server)
return
finally:
try:
self.connecting.remove(server)
except KeyError:
pass
with self.interface_lock:
self.interfaces[server] = interface
if server == self.default_server:
self.switch_to_interface(server)
self.notify('interfaces')
def init_headers_file(self):
b = blockchain.blockchains[0]
filename = b.path()
length = 80 * len(constants.net.CHECKPOINTS) * 2016
if not os.path.exists(filename) or os.path.getsize(filename) < length:
with open(filename, 'wb') as f:
if length > 0:
f.seek(length - 1)
f.write(b'\x00')
with b.lock:
b.update_size()
async def get_merkle_for_transaction(self, tx_hash, tx_height):
return await self.interface.session.send_request(
'blockchain.transaction.get_merkle', [tx_hash, tx_height])
def broadcast_transaction_from_non_network_thread(self, tx, timeout=10):
# note: calling this from the network thread will deadlock it
fut = asyncio.run_coroutine_threadsafe(
self.broadcast_transaction(tx, timeout=timeout), self.asyncio_loop)
return fut.result()
async def broadcast_transaction(self, tx, timeout=10):
try:
out = await self.interface.session.send_request(
'blockchain.transaction.broadcast', [str(tx)], timeout=timeout)
except asyncio.TimeoutError as e:
return False, "error: operation timed out"
except Exception as e:
return False, "error: " + str(e)
if out != tx.txid():
return False, "error: " + out
return True, out
async def request_chunk(self,
height,
tip,
session=None,
can_return_early=False):
if session is None: session = self.interface.session
index = height // 2016
if can_return_early and index in self.requested_chunks:
return
size = 2016
if tip is not None:
size = min(size, tip - index * 2016)
size = max(size, 0)
try:
self.requested_chunks.add(index)
res = await session.send_request('blockchain.block.headers',
[index * 2016, size])
finally:
try:
self.requested_chunks.remove(index)
except KeyError:
pass
conn = self.blockchain().connect_chunk(index, res['hex'])
if not conn:
return conn, 0
return conn, res['count']
@with_interface_lock
def blockchain(self):
if self.interface and self.interface.blockchain is not None:
self.blockchain_index = self.interface.blockchain.forkpoint
return blockchain.blockchains[self.blockchain_index]
@with_interface_lock
def get_blockchains(self):
out = {}
with self.blockchains_lock:
blockchain_items = list(blockchain.blockchains.items())
for k, b in blockchain_items:
r = list(
filter(lambda i: i.blockchain == b,
list(self.interfaces.values())))
if r:
out[k] = r
return out
def follow_chain(self, index):
bc = blockchain.blockchains.get(index)
if bc:
self.blockchain_index = index
self.config.set_key('blockchain_index', index)
with self.interface_lock:
interfaces = list(self.interfaces.values())
for i in interfaces:
if i.blockchain == bc:
self.switch_to_interface(i.server)
break
else:
raise Exception('blockchain not found', index)
with self.interface_lock:
if self.interface:
net_params = self.get_parameters()
host, port, protocol = deserialize_server(
self.interface.server)
net_params = net_params._replace(host=host,
port=port,
protocol=protocol)
self.set_parameters(net_params)
def get_local_height(self):
return self.blockchain().height()
def export_checkpoints(self, path):
# run manually from the console to generate checkpoints
cp = self.blockchain().get_checkpoints()
with open(path, 'w', encoding='utf-8') as f:
f.write(json.dumps(cp, indent=4))
def start(self, fx=None):
self.main_taskgroup = TaskGroup()
async def main():
self.init_headers_file()
async with self.main_taskgroup as group:
await group.spawn(self.maintain_sessions())
if fx: await group.spawn(fx)
self._wrapper_thread = threading.Thread(
target=self.asyncio_loop.run_until_complete, args=(main(), ))
self._wrapper_thread.start()
def stop(self):
asyncio.run_coroutine_threadsafe(
self.main_taskgroup.cancel_remaining(), self.asyncio_loop)
def join(self):
self._wrapper_thread.join(1)
async def maintain_sessions(self):
while True:
while self.socket_queue.qsize() > 0:
server = self.socket_queue.get()
asyncio.get_event_loop().create_task(
self.new_interface(server))
remove = []
for k, i in self.interfaces.items():
if i.fut.done() and not i.exception:
assert False, "interface future should not finish without exception"
if i.exception:
if not i.fut.done():
try:
i.fut.cancel()
except Exception as e:
self.print_error('exception while cancelling fut',
e)
try:
raise i.exception
except BaseException as e:
self.print_error(i.server, "errored because:", str(e),
str(type(e)))
remove.append(k)
for k in remove:
self.connection_down(k)
# nodes
now = time.time()
for i in range(self.num_server - len(self.interfaces) -
len(self.connecting)):
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)
else:
if self.config.is_fee_estimates_update_required():
await self.interface.group.spawn(
self.request_fee_estimates(self.interface))
await asyncio.sleep(0.1)
class Daemon(Logger):
network: Optional[Network]
gui_object: Optional[Union['gui.qt.ElectrumGui', 'gui.kivy.ElectrumGui']]
@profiler
def __init__(self, config: SimpleConfig, fd=None, *, listen_jsonrpc=True):
Logger.__init__(self)
self.config = config
if fd is None and listen_jsonrpc:
fd = get_file_descriptor(config)
if fd is None:
raise Exception('failed to lock daemon; already running?')
if 'wallet_path' in config.cmdline_options:
self.logger.warning("Ignoring parameter 'wallet_path' for daemon. "
"Use the load_wallet command instead.")
self.asyncio_loop = asyncio.get_event_loop()
asyncio_wait_time = 0
while not self.asyncio_loop.is_running():
if asyncio_wait_time > 30:
raise Exception('event loop not running for 30 seconds')
time.sleep(0.1)
asyncio_wait_time += 0.1
self.network = None
if not config.get('offline'):
self.network = Network(config, daemon=self)
self.fx = FxThread(config, self.network)
self.gui_object = None
# path -> wallet; make sure path is standardized.
self._wallets = {} # type: Dict[str, Abstract_Wallet]
self.current_wallet_path = None
daemon_jobs = []
# Setup commands server
self.commands_server = None
if listen_jsonrpc:
self.commands_server = CommandsServer(self, fd)
daemon_jobs.append(self.commands_server.run())
# pay server
self.pay_server = None
payserver_address = self.config.get_netaddress('payserver_address')
if not config.get('offline') and payserver_address:
self.pay_server = PayServer(self, payserver_address)
daemon_jobs.append(self.pay_server.run())
if self.network:
self.network.start(jobs=[self.fx.run])
self.stopping_soon = threading.Event()
self.stopped_event = asyncio.Event()
self.taskgroup = TaskGroup()
asyncio.run_coroutine_threadsafe(self._run(jobs=daemon_jobs),
self.asyncio_loop)
@log_exceptions
async def _run(self, jobs: Iterable = None):
if jobs is None:
jobs = []
self.logger.info("starting taskgroup.")
try:
async with self.taskgroup as group:
[await group.spawn(job) for job in jobs]
await group.spawn(asyncio.Event().wait
) # run forever (until cancel)
except asyncio.CancelledError:
raise
except Exception as e:
self.logger.exception("taskgroup died.")
finally:
self.logger.info("taskgroup stopped.")
self.stopping_soon.set()
def load_wallet(self,
path,
password,
*,
manual_upgrades=True,
set_current=False) -> Optional[Abstract_Wallet]:
path = standardize_path(path)
# wizard will be launched if we return
if path in self._wallets:
wallet = self._wallets[path]
if set_current:
self.current_wallet_path = path
return wallet
storage = WalletStorage(path)
if not storage.file_exists():
return
if storage.is_encrypted():
if not password:
return
storage.decrypt(password)
# read data, pass it to db
db = WalletDB(storage.read(), manual_upgrades=manual_upgrades)
if db.upgrade_done:
storage.backup_old_version()
if getattr(storage, 'backup_message', None):
log_backup_msg = ' '.join(storage.backup_message.split('\n'))
self.logger.info(f'{log_backup_msg}')
if not self.config.get('detach'):
util.print_stderr(f'{storage.backup_message}\n')
if db.requires_split():
return
if db.requires_upgrade():
return
if db.get_action():
return
if db.check_unfinished_multisig():
return
wallet = Wallet(db, storage, config=self.config)
wallet.start_network(self.network)
self._wallets[path] = wallet
if set_current:
self.current_wallet_path = path
return wallet
def add_wallet(self, wallet: Abstract_Wallet) -> None:
path = wallet.storage.path
path = standardize_path(path)
self._wallets[path] = wallet
def get_wallet(self, path: str) -> Optional[Abstract_Wallet]:
path = standardize_path(path)
return self._wallets.get(path)
def get_wallets(self) -> Dict[str, Abstract_Wallet]:
return dict(self._wallets) # copy
def delete_wallet(self, path: str) -> bool:
self.stop_wallet(path)
if os.path.exists(path):
os.unlink(path)
return True
return False
def stop_wallet(self, path: str) -> bool:
"""Returns True iff a wallet was found."""
path = standardize_path(path)
wallet = self._wallets.pop(path, None)
if self.current_wallet_path == path:
self.current_wallet_path = None
if not wallet:
return False
fut = asyncio.run_coroutine_threadsafe(wallet.stop(),
self.asyncio_loop)
fut.result()
return True
def run_daemon(self):
try:
self.stopping_soon.wait()
except KeyboardInterrupt:
self.stopping_soon.set()
self.on_stop()
async def stop(self):
self.stopping_soon.set()
await self.stopped_event.wait()
def on_stop(self):
try:
self.logger.info("on_stop() entered. initiating shutdown")
if self.gui_object:
self.gui_object.stop()
async def stop_async():
self.logger.info("stopping all wallets")
async with TaskGroup() as group:
for k, wallet in self._wallets.items():
await group.spawn(wallet.stop())
self.logger.info("stopping network and taskgroup")
async with ignore_after(2):
async with TaskGroup() as group:
if self.network:
await group.spawn(
self.network.stop(full_shutdown=True))
await group.spawn(self.taskgroup.cancel_remaining())
fut = asyncio.run_coroutine_threadsafe(stop_async(),
self.asyncio_loop)
fut.result()
finally:
self.logger.info("removing lockfile")
remove_lockfile(get_lockfile(self.config))
self.logger.info("stopped")
self.asyncio_loop.call_soon_threadsafe(self.stopped_event.set)
def run_gui(self, config, plugins):
threading.current_thread().setName('GUI')
gui_name = config.get('gui', 'qt')
if gui_name in ['lite', 'classic']:
gui_name = 'qt'
self.logger.info(f'launching GUI: {gui_name}')
try:
gui = __import__('electrum_zcash.gui.' + gui_name,
fromlist=['electrum_zcash'])
self.gui_object = gui.ElectrumGui(config, self, plugins)
self.gui_object.main()
except BaseException as e:
self.logger.error(
f'GUI raised exception: {repr(e)}. shutting down.')
raise
finally:
# app will exit now
self.on_stop()
class Daemon(Logger):
network: Optional[Network]
gui_object: Optional['gui.BaseElectrumSysGui']
@profiler
def __init__(self, config: SimpleConfig, fd=None, *, listen_jsonrpc=True):
Logger.__init__(self)
self.config = config
self.listen_jsonrpc = listen_jsonrpc
if fd is None and listen_jsonrpc:
fd = get_file_descriptor(config)
if fd is None:
raise Exception('failed to lock daemon; already running?')
if 'wallet_path' in config.cmdline_options:
self.logger.warning("Ignoring parameter 'wallet_path' for daemon. "
"Use the load_wallet command instead.")
self.asyncio_loop = asyncio.get_event_loop()
self.network = None
if not config.get('offline'):
self.network = Network(config, daemon=self)
self.fx = FxThread(config, self.network)
self.gui_object = None
# path -> wallet; make sure path is standardized.
self._wallets = {} # type: Dict[str, Abstract_Wallet]
daemon_jobs = []
# Setup commands server
self.commands_server = None
if listen_jsonrpc:
self.commands_server = CommandsServer(self, fd)
daemon_jobs.append(self.commands_server.run())
# pay server
self.pay_server = None
payserver_address = self.config.get_netaddress('payserver_address')
if not config.get('offline') and payserver_address:
self.pay_server = PayServer(self, payserver_address)
daemon_jobs.append(self.pay_server.run())
# server-side watchtower
self.watchtower = None
watchtower_address = self.config.get_netaddress('watchtower_address')
if not config.get('offline') and watchtower_address:
self.watchtower = WatchTowerServer(self.network, watchtower_address)
daemon_jobs.append(self.watchtower.run)
if self.network:
self.network.start(jobs=[self.fx.run])
# prepare lightning functionality, also load channel db early
if self.config.get('use_gossip', False):
self.network.start_gossip()
self._stop_entered = False
self._stopping_soon_or_errored = threading.Event()
self._stopped_event = threading.Event()
self.taskgroup = TaskGroup()
asyncio.run_coroutine_threadsafe(self._run(jobs=daemon_jobs), self.asyncio_loop)
@log_exceptions
async def _run(self, jobs: Iterable = None):
if jobs is None:
jobs = []
self.logger.info("starting taskgroup.")
try:
async with self.taskgroup as group:
[await group.spawn(job) for job in jobs]
await group.spawn(asyncio.Event().wait) # run forever (until cancel)
except asyncio.CancelledError:
raise
except Exception as e:
self.logger.exception("taskgroup died.")
util.send_exception_to_crash_reporter(e)
finally:
self.logger.info("taskgroup stopped.")
# note: we could just "await self.stop()", but in that case GUI users would
# not see the exception (especially if the GUI did not start yet).
self._stopping_soon_or_errored.set()
def load_wallet(self, path, password, *, manual_upgrades=True) -> Optional[Abstract_Wallet]:
path = standardize_path(path)
# wizard will be launched if we return
if path in self._wallets:
wallet = self._wallets[path]
return wallet
storage = WalletStorage(path)
if not storage.file_exists():
return
if storage.is_encrypted():
if not password:
return
storage.decrypt(password)
# read data, pass it to db
db = WalletDB(storage.read(), manual_upgrades=manual_upgrades)
if db.requires_split():
return
if db.requires_upgrade():
return
if db.get_action():
return
wallet = Wallet(db, storage, config=self.config)
wallet.start_network(self.network)
self._wallets[path] = wallet
return wallet
def add_wallet(self, wallet: Abstract_Wallet) -> None:
path = wallet.storage.path
path = standardize_path(path)
self._wallets[path] = wallet
def get_wallet(self, path: str) -> Optional[Abstract_Wallet]:
path = standardize_path(path)
return self._wallets.get(path)
def get_wallets(self) -> Dict[str, Abstract_Wallet]:
return dict(self._wallets) # copy
def delete_wallet(self, path: str) -> bool:
self.stop_wallet(path)
if os.path.exists(path):
os.unlink(path)
return True
return False
def stop_wallet(self, path: str) -> bool:
"""Returns True iff a wallet was found."""
# note: this must not be called from the event loop. # TODO raise if so
fut = asyncio.run_coroutine_threadsafe(self._stop_wallet(path), self.asyncio_loop)
return fut.result()
async def _stop_wallet(self, path: str) -> bool:
"""Returns True iff a wallet was found."""
path = standardize_path(path)
wallet = self._wallets.pop(path, None)
if not wallet:
return False
await wallet.stop()
return True
def run_daemon(self):
try:
self._stopping_soon_or_errored.wait()
except KeyboardInterrupt:
asyncio.run_coroutine_threadsafe(self.stop(), self.asyncio_loop).result()
self._stopped_event.wait()
async def stop(self):
if self._stop_entered:
return
self._stop_entered = True
self._stopping_soon_or_errored.set()
self.logger.info("stop() entered. initiating shutdown")
try:
if self.gui_object:
self.gui_object.stop()
self.logger.info("stopping all wallets")
async with TaskGroup() as group:
for k, wallet in self._wallets.items():
await group.spawn(wallet.stop())
self.logger.info("stopping network and taskgroup")
async with ignore_after(2):
async with TaskGroup() as group:
if self.network:
await group.spawn(self.network.stop(full_shutdown=True))
await group.spawn(self.taskgroup.cancel_remaining())
finally:
if self.listen_jsonrpc:
self.logger.info("removing lockfile")
remove_lockfile(get_lockfile(self.config))
self.logger.info("stopped")
self._stopped_event.set()
def run_gui(self, config, plugins):
threading.current_thread().name = 'GUI'
gui_name = config.get('gui', 'qt')
if gui_name in ['lite', 'classic']:
gui_name = 'qt'
self.logger.info(f'launching GUI: {gui_name}')
try:
gui = __import__('electrumsys.gui.' + gui_name, fromlist=['electrumsys'])
self.gui_object = gui.ElectrumSysGui(config=config, daemon=self, plugins=plugins)
if not self._stop_entered:
self.gui_object.main()
else:
# If daemon.stop() was called before gui_object got created, stop gui now.
self.gui_object.stop()
except BaseException as e:
self.logger.error(f'GUI raised exception: {repr(e)}. shutting down.')
raise
finally:
# app will exit now
asyncio.run_coroutine_threadsafe(self.stop(), self.asyncio_loop).result()
