network: replace "server" strings with ServerAddr objects

electrum/daemon.py

@@ -270,6 +270,8 @@ class AuthenticationCredentialsInvalid(AuthenticationError):
 
 class Daemon(Logger):
 
+    network: Optional[Network]
+
     @profiler
     def __init__(self, config: SimpleConfig, fd=None, *, listen_jsonrpc=True):
         Logger.__init__(self)

electrum/exchange_rate.py

@@ -453,7 +453,7 @@ def get_exchanges_by_ccy(history=True):
 
 class FxThread(ThreadJob):
 
-    def __init__(self, config: SimpleConfig, network: Network):
+    def __init__(self, config: SimpleConfig, network: Optional[Network]):
         ThreadJob.__init__(self)
         self.config = config
         self.network = network

electrum/gui/qt/network_dialog.py

@@ -36,7 +36,7 @@ from PyQt5.QtGui import QFontMetrics
 
 from electrum.i18n import _
 from electrum import constants, blockchain, util
-from electrum.interface import serialize_server, deserialize_server
+from electrum.interface import ServerAddr
 from electrum.network import Network
 from electrum.logging import get_logger
 
@@ -72,10 +72,13 @@ class NetworkDialog(QDialog):
 
 
 class NodesListWidget(QTreeWidget):
+    SERVER_ADDR_ROLE = Qt.UserRole + 100
+    CHAIN_ID_ROLE = Qt.UserRole + 101
+    IS_SERVER_ROLE = Qt.UserRole + 102
 
     def __init__(self, parent):
         QTreeWidget.__init__(self)
-        self.parent = parent
+        self.parent = parent  # type: NetworkChoiceLayout
         self.setHeaderLabels([_('Connected node'), _('Height')])
         self.setContextMenuPolicy(Qt.CustomContextMenu)
         self.customContextMenuRequested.connect(self.create_menu)
@@ -84,13 +87,13 @@ class NodesListWidget(QTreeWidget):
         item = self.currentItem()
         if not item:
             return
-        is_server = not bool(item.data(0, Qt.UserRole))
+        is_server = bool(item.data(0, self.IS_SERVER_ROLE))
         menu = QMenu()
         if is_server:
-            server = item.data(1, Qt.UserRole)
+            server = item.data(0, self.SERVER_ADDR_ROLE)  # type: ServerAddr
             menu.addAction(_("Use as server"), lambda: self.parent.follow_server(server))
         else:
-            chain_id = item.data(1, Qt.UserRole)
+            chain_id = item.data(0, self.CHAIN_ID_ROLE)
             menu.addAction(_("Follow this branch"), lambda: self.parent.follow_branch(chain_id))
         menu.exec_(self.viewport().mapToGlobal(position))
 
@@ -117,15 +120,15 @@ class NodesListWidget(QTreeWidget):
             name = b.get_name()
             if n_chains > 1:
                 x = QTreeWidgetItem([name + '@%d'%b.get_max_forkpoint(), '%d'%b.height()])
-                x.setData(0, Qt.UserRole, 1)
+                x.setData(0, self.IS_SERVER_ROLE, 0)
-                x.setData(1, Qt.UserRole, b.get_id())
+                x.setData(0, self.CHAIN_ID_ROLE, b.get_id())
             else:
                 x = self
             for i in interfaces:
                 star = ' *' if i == network.interface else ''
                 item = QTreeWidgetItem([i.host + star, '%d'%i.tip])
-                item.setData(0, Qt.UserRole, 0)
+                item.setData(0, self.IS_SERVER_ROLE, 1)
-                item.setData(1, Qt.UserRole, i.server)
+                item.setData(0, self.SERVER_ADDR_ROLE, i.server)
                 x.addChild(item)
             if n_chains > 1:
                 self.addTopLevelItem(x)
@@ -144,11 +147,11 @@ class ServerListWidget(QTreeWidget):
         HOST = 0
         PORT = 1
 
-    SERVER_STR_ROLE = Qt.UserRole + 100
+    SERVER_ADDR_ROLE = Qt.UserRole + 100
 
     def __init__(self, parent):
         QTreeWidget.__init__(self)
-        self.parent = parent
+        self.parent = parent  # type: NetworkChoiceLayout
         self.setHeaderLabels([_('Host'), _('Port')])
         self.setContextMenuPolicy(Qt.CustomContextMenu)
         self.customContextMenuRequested.connect(self.create_menu)
@@ -158,14 +161,13 @@ class ServerListWidget(QTreeWidget):
         if not item:
             return
         menu = QMenu()
-        server = item.data(self.Columns.HOST, self.SERVER_STR_ROLE)
+        server = item.data(self.Columns.HOST, self.SERVER_ADDR_ROLE)
         menu.addAction(_("Use as server"), lambda: self.set_server(server))
         menu.exec_(self.viewport().mapToGlobal(position))
 
-    def set_server(self, s):
+    def set_server(self, server: ServerAddr):
-        host, port, protocol = deserialize_server(s)
+        self.parent.server_host.setText(server.host)
-        self.parent.server_host.setText(host)
+        self.parent.server_port.setText(str(server.port))
-        self.parent.server_port.setText(port)
         self.parent.set_server()
 
     def keyPressEvent(self, event):
@@ -188,8 +190,8 @@ class ServerListWidget(QTreeWidget):
             port = d.get(protocol)
             if port:
                 x = QTreeWidgetItem([_host, port])
-                server = serialize_server(_host, port, protocol)
+                server = ServerAddr(_host, port, protocol=protocol)
-                x.setData(self.Columns.HOST, self.SERVER_STR_ROLE, server)
+                x.setData(self.Columns.HOST, self.SERVER_ADDR_ROLE, server)
                 self.addTopLevelItem(x)
 
         h = self.header()
@@ -431,7 +433,7 @@ class NetworkChoiceLayout(object):
         self.network.run_from_another_thread(self.network.follow_chain_given_id(chain_id))
         self.update()
 
-    def follow_server(self, server):
+    def follow_server(self, server: ServerAddr):
         self.network.run_from_another_thread(self.network.follow_chain_given_server(server))
         self.update()
 

electrum/gui/text.py

@@ -6,6 +6,7 @@ import locale
 from decimal import Decimal
 import getpass
 import logging
+from typing import TYPE_CHECKING
 
 import electrum
 from electrum import util
@@ -15,15 +16,21 @@ from electrum.transaction import PartialTxOutput
 from electrum.wallet import Wallet
 from electrum.storage import WalletStorage
 from electrum.network import NetworkParameters, TxBroadcastError, BestEffortRequestFailed
-from electrum.interface import deserialize_server
+from electrum.interface import ServerAddr
 from electrum.logging import console_stderr_handler
 
+if TYPE_CHECKING:
+    from electrum.daemon import Daemon
+    from electrum.simple_config import SimpleConfig
+    from electrum.plugin import Plugins
+
+
 _ = lambda x:x  # i18n
 
 
 class ElectrumGui:
 
-    def __init__(self, config, daemon, plugins):
+    def __init__(self, config: 'SimpleConfig', daemon: 'Daemon', plugins: 'Plugins'):
 
         self.config = config
         self.network = daemon.network
@@ -404,21 +411,24 @@ class ElectrumGui:
         net_params = self.network.get_parameters()
         host, port, protocol = net_params.host, net_params.port, net_params.protocol
         proxy_config, auto_connect = net_params.proxy, net_params.auto_connect
-        srv = 'auto-connect' if auto_connect else self.network.default_server
+        srv = 'auto-connect' if auto_connect else str(self.network.default_server)
         out = self.run_dialog('Network', [
             {'label':'server', 'type':'str', 'value':srv},
             {'label':'proxy', 'type':'str', 'value':self.config.get('proxy', '')},
             ], buttons = 1)
         if out:
             if out.get('server'):
-                server = out.get('server')
+                server_str = out.get('server')
-                auto_connect = server == 'auto-connect'
+                auto_connect = server_str == 'auto-connect'
                 if not auto_connect:
                     try:
-                        host, port, protocol = deserialize_server(server)
+                        server_addr = ServerAddr.from_str(server_str)
                     except Exception:
-                        self.show_message("Error:" + server + "\nIn doubt, type \"auto-connect\"")
+                        self.show_message("Error:" + server_str + "\nIn doubt, type \"auto-connect\"")
                         return False
+                    host = server_addr.host
+                    port = str(server_addr.port)
+                    protocol = server_addr.protocol
             if out.get('server') or out.get('proxy'):
                 proxy = electrum.network.deserialize_proxy(out.get('proxy')) if out.get('proxy') else proxy_config
                 net_params = NetworkParameters(host, port, protocol, proxy, auto_connect)

electrum/interface.py

@@ -29,7 +29,7 @@ import sys
 import traceback
 import asyncio
 import socket
-from typing import Tuple, Union, List, TYPE_CHECKING, Optional, Set
+from typing import Tuple, Union, List, TYPE_CHECKING, Optional, Set, NamedTuple
 from collections import defaultdict
 from ipaddress import IPv4Network, IPv6Network, ip_address, IPv6Address
 import itertools
@@ -198,22 +198,57 @@ class _RSClient(RSClient):
             raise ConnectError(e) from e
 
 
-def deserialize_server(server_str: str) -> Tuple[str, str, str]:
+class ServerAddr:
-    # host might be IPv6 address, hence do rsplit:
-    host, port, protocol = str(server_str).rsplit(':', 2)
-    if not host:
-        raise ValueError('host must not be empty')
-    if host[0] == '[' and host[-1] == ']':  # IPv6
-        host = host[1:-1]
-    if protocol not in ('s', 't'):
-        raise ValueError('invalid network protocol: {}'.format(protocol))
-    net_addr = NetAddress(host, port)  # this validates host and port
-    host = str(net_addr.host)  # canonical form (if e.g. IPv6 address)
-    return host, port, protocol
 
+    def __init__(self, host: str, port: Union[int, str], *, protocol: str = None):
+        assert isinstance(host, str), repr(host)
+        if protocol is None:
+            protocol = 's'
+        if not host:
+            raise ValueError('host must not be empty')
+        if host[0] == '[' and host[-1] == ']':  # IPv6
+            host = host[1:-1]
+        try:
+            net_addr = NetAddress(host, port)  # this validates host and port
+        except Exception as e:
+            raise ValueError(f"cannot construct ServerAddr: invalid host or port (host={host}, port={port})") from e
+        if protocol not in ('s', 't'):
+            raise ValueError(f"invalid network protocol: {protocol}")
+        self.host = str(net_addr.host)  # canonical form (if e.g. IPv6 address)
+        self.port = int(net_addr.port)
+        self.protocol = protocol
+        self._net_addr_str = str(net_addr)
+
+    @classmethod
+    def from_str(cls, s: str) -> 'ServerAddr':
+        # host might be IPv6 address, hence do rsplit:
+        host, port, protocol = str(s).rsplit(':', 2)
+        return ServerAddr(host=host, port=port, protocol=protocol)
 
-def serialize_server(host: str, port: Union[str, int], protocol: str) -> str:
+    def __str__(self):
-    return str(':'.join([host, str(port), protocol]))
+        return '{}:{}'.format(self.net_addr_str(), self.protocol)
+
+    def to_json(self) -> str:
+        return str(self)
+
+    def __repr__(self):
+        return f'<ServerAddr host={self.host} port={self.port} protocol={self.protocol}>'
+
+    def net_addr_str(self) -> str:
+        return self._net_addr_str
+
+    def __eq__(self, other):
+        if not isinstance(other, ServerAddr):
+            return False
+        return (self.host == other.host
+                and self.port == other.port
+                and self.protocol == other.protocol)
+
+    def __ne__(self, other):
+        return not (self == other)
+
+    def __hash__(self):
+        return hash((self.host, self.port, self.protocol))
 
 
 def _get_cert_path_for_host(*, config: 'SimpleConfig', host: str) -> str:
@@ -232,12 +267,10 @@ class Interface(Logger):
 
     LOGGING_SHORTCUT = 'i'
 
-    def __init__(self, network: 'Network', server: str, proxy: Optional[dict]):
+    def __init__(self, *, network: 'Network', server: ServerAddr, proxy: Optional[dict]):
         self.ready = asyncio.Future()
         self.got_disconnected = asyncio.Future()
         self.server = server
-        self.host, self.port, self.protocol = deserialize_server(self.server)
-        self.port = int(self.port)
         Logger.__init__(self)
         assert network.config.path
         self.cert_path = _get_cert_path_for_host(config=network.config, host=self.host)
@@ -259,8 +292,20 @@ class Interface(Logger):
             self.network.taskgroup.spawn(self.run()), self.network.asyncio_loop)
         self.taskgroup = SilentTaskGroup()
 
+    @property
+    def host(self):
+        return self.server.host
+
+    @property
+    def port(self):
+        return self.server.port
+
+    @property
+    def protocol(self):
+        return self.server.protocol
+
     def diagnostic_name(self):
-        return str(NetAddress(self.host, self.port))
+        return self.server.net_addr_str()
 
     def __str__(self):
         return f"<Interface {self.diagnostic_name()}>"

electrum/network.py

@@ -32,7 +32,7 @@ import socket
 import json
 import sys
 import asyncio
-from typing import NamedTuple, Optional, Sequence, List, Dict, Tuple, TYPE_CHECKING, Iterable
+from typing import NamedTuple, Optional, Sequence, List, Dict, Tuple, TYPE_CHECKING, Iterable, Set
 import traceback
 import concurrent
 from concurrent import futures
@@ -44,7 +44,7 @@ from aiohttp import ClientResponse
 from . import util
 from .util import (log_exceptions, ignore_exceptions,
                    bfh, SilentTaskGroup, make_aiohttp_session, send_exception_to_crash_reporter,
-                   is_hash256_str, is_non_negative_integer)
+                   is_hash256_str, is_non_negative_integer, MyEncoder)
 
 from .bitcoin import COIN
 from . import constants
@@ -53,9 +53,9 @@ from . import bitcoin
 from . import dns_hacks
 from .transaction import Transaction
 from .blockchain import Blockchain, HEADER_SIZE
-from .interface import (Interface, serialize_server, deserialize_server,
+from .interface import (Interface,
                         RequestTimedOut, NetworkTimeout, BUCKET_NAME_OF_ONION_SERVERS,
-                        NetworkException, RequestCorrupted)
+                        NetworkException, RequestCorrupted, ServerAddr)
 from .version import PROTOCOL_VERSION
 from .simple_config import SimpleConfig
 from .i18n import _
@@ -117,18 +117,18 @@ def filter_noonion(servers):
     return {k: v for k, v in servers.items() if not k.endswith('.onion')}
 
 
-def filter_protocol(hostmap, protocol='s'):
+def filter_protocol(hostmap, protocol='s') -> Sequence[ServerAddr]:
-    '''Filters the hostmap for those implementing protocol.
+    """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))
+            eligible.append(ServerAddr(host, port, protocol=protocol))
     return eligible
 
 
-def pick_random_server(hostmap=None, protocol='s', exclude_set=None):
+def pick_random_server(hostmap=None, *, protocol='s',
+                       exclude_set: Set[ServerAddr] = None) -> Optional[ServerAddr]:
     if hostmap is None:
         hostmap = constants.net.DEFAULT_SERVERS
     if exclude_set is None:
@@ -240,6 +240,14 @@ class Network(Logger):
 
     LOGGING_SHORTCUT = 'n'
 
+    taskgroup: Optional[TaskGroup]
+    interface: Optional[Interface]
+    interfaces: Dict[ServerAddr, Interface]
+    connecting: Set[ServerAddr]
+    server_queue: 'Optional[queue.Queue[ServerAddr]]'
+    disconnected_servers: Set[ServerAddr]
+    default_server: ServerAddr
+
     def __init__(self, config: SimpleConfig, *, daemon: 'Daemon' = None):
         global _INSTANCE
         assert _INSTANCE is None, "Network is a singleton!"
@@ -266,14 +274,15 @@ class Network(Logger):
         # Sanitize default server
         if self.default_server:
             try:
-                deserialize_server(self.default_server)
+                self.default_server = ServerAddr.from_str(self.default_server)
             except:
                 self.logger.warning('failed to parse server-string; falling back to localhost.')
-                self.default_server = "localhost:50002:s"
+                self.default_server = ServerAddr.from_str("localhost:50002:s")
-        if not self.default_server:
+        else:
             self.default_server = pick_random_server()
+        assert isinstance(self.default_server, ServerAddr), f"invalid type for default_server: {self.default_server!r}"
 
-        self.taskgroup = None  # type: TaskGroup
+        self.taskgroup = None
 
         # locks
         self.restart_lock = asyncio.Lock()
@@ -295,10 +304,10 @@ class Network(Logger):
         self.server_retry_time = time.time()
         self.nodes_retry_time = time.time()
         # the main server we are currently communicating with
-        self.interface = None  # type: Optional[Interface]
+        self.interface = None
         self.default_server_changed_event = asyncio.Event()
         # set of servers we have an ongoing connection with
-        self.interfaces = {}  # type: Dict[str, Interface]
+        self.interfaces = {}
         self.auto_connect = self.config.get('auto_connect', True)
         self.connecting = set()
         self.server_queue = None
@@ -347,14 +356,15 @@ class Network(Logger):
                 return func(self, *args, **kwargs)
         return func_wrapper
 
-    def _read_recent_servers(self):
+    def _read_recent_servers(self) -> List[ServerAddr]:
         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)
+                servers_list = json.loads(data)
+            return [ServerAddr.from_str(s) for s in servers_list]
         except:
             return []
 
@@ -363,7 +373,7 @@ class Network(Logger):
         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)
+        s = json.dumps(self.recent_servers, indent=4, sort_keys=True, cls=MyEncoder)
         try:
             with open(path, "w", encoding='utf-8') as f:
                 f.write(s)
@@ -462,10 +472,10 @@ class Network(Logger):
             util.trigger_callback(key, self.get_status_value(key))
 
     def get_parameters(self) -> NetworkParameters:
-        host, port, protocol = deserialize_server(self.default_server)
+        server = self.default_server
-        return NetworkParameters(host=host,
+        return NetworkParameters(host=server.host,
-                                 port=port,
+                                 port=str(server.port),
-                                 protocol=protocol,
+                                 protocol=server.protocol,
                                  proxy=self.proxy,
                                  auto_connect=self.auto_connect,
                                  oneserver=self.oneserver)
@@ -474,7 +484,7 @@ class Network(Logger):
         if self.is_connected():
             return self.donation_address
 
-    def get_interfaces(self) -> List[str]:
+    def get_interfaces(self) -> List[ServerAddr]:
         """The list of servers for the connected interfaces."""
         with self.interfaces_lock:
             return list(self.interfaces)
@@ -516,21 +526,18 @@ class Network(Logger):
         # hardcoded servers
         out.update(constants.net.DEFAULT_SERVERS)
         # add recent servers
-        for s in self.recent_servers:
+        for server in self.recent_servers:
-            try:
+            port = str(server.port)
-                host, port, protocol = deserialize_server(s)
+            if server.host in out:
-            except:
+                out[server.host].update({server.protocol: port})
-                continue
-            if host in out:
-                out[host].update({protocol: port})
             else:
-                out[host] = {protocol: port}
+                out[server.host] = {server.protocol: port}
         # potentially filter out some
         if self.config.get('noonion'):
             out = filter_noonion(out)
         return out
 
-    def _start_interface(self, server: str):
+    def _start_interface(self, server: ServerAddr):
         if server not in self.interfaces and server not in self.connecting:
             if server == self.default_server:
                 self.logger.info(f"connecting to {server} as new interface")
@@ -538,10 +545,10 @@ class Network(Logger):
             self.connecting.add(server)
             self.server_queue.put(server)
 
-    def _start_random_interface(self):
+    def _start_random_interface(self) -> Optional[ServerAddr]:
         with self.interfaces_lock:
             exclude_set = self.disconnected_servers | set(self.interfaces) | self.connecting
-        server = pick_random_server(self.get_servers(), self.protocol, exclude_set)
+        server = pick_random_server(self.get_servers(), protocol=self.protocol, exclude_set=exclude_set)
         if server:
             self._start_interface(server)
         return server
@@ -557,10 +564,9 @@ class Network(Logger):
         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))
+            server = ServerAddr(host, port, protocol=protocol)
             if proxy:
                 proxy_modes.index(proxy['mode']) + 1
                 int(proxy['port'])
@@ -569,9 +575,9 @@ class Network(Logger):
         self.config.set_key('auto_connect', net_params.auto_connect, False)
         self.config.set_key('oneserver', net_params.oneserver, False)
         self.config.set_key('proxy', proxy_str, False)
-        self.config.set_key('server', server_str, True)
+        self.config.set_key('server', str(server), True)
         # abort if changes were not allowed by config
-        if self.config.get('server') != server_str \
+        if self.config.get('server') != str(server) \
                 or self.config.get('proxy') != proxy_str \
                 or self.config.get('oneserver') != net_params.oneserver:
             return
@@ -581,10 +587,10 @@ class Network(Logger):
             if self.proxy != proxy or self.protocol != protocol or self.oneserver != net_params.oneserver:
                 # Restart the network defaulting to the given server
                 await self._stop()
-                self.default_server = server_str
+                self.default_server = server
                 await self._start()
-            elif self.default_server != server_str:
+            elif self.default_server != server:
-                await self.switch_to_interface(server_str)
+                await self.switch_to_interface(server)
             else:
                 await self.switch_lagging_interface()
 
@@ -646,7 +652,7 @@ class Network(Logger):
             # FIXME switch to best available?
             self.logger.info("tried to switch to best chain but no interfaces are on it")
 
-    async def switch_to_interface(self, server: str):
+    async def switch_to_interface(self, server: ServerAddr):
         """Switch to server as our main interface. If no connection exists,
         queue interface to be started. The actual switch will
         happen when the interface becomes ready.
@@ -722,8 +728,8 @@ class Network(Logger):
 
     @ignore_exceptions  # do not kill main_taskgroup
     @log_exceptions
-    async def _run_new_interface(self, server):
+    async def _run_new_interface(self, server: ServerAddr):
-        interface = Interface(self, server, self.proxy)
+        interface = Interface(network=self, server=server, proxy=self.proxy)
         # note: using longer timeouts here as DNS can sometimes be slow!
         timeout = self.get_network_timeout_seconds(NetworkTimeout.Generic)
         try:
@@ -1070,23 +1076,26 @@ class Network(Logger):
         with self.interfaces_lock: interfaces = list(self.interfaces.values())
         interfaces_on_selected_chain = list(filter(lambda iface: iface.blockchain == bc, interfaces))
         if len(interfaces_on_selected_chain) == 0: return
-        chosen_iface = random.choice(interfaces_on_selected_chain)
+        chosen_iface = random.choice(interfaces_on_selected_chain)  # type: Interface
         # switch to server (and save to config)
         net_params = self.get_parameters()
-        host, port, protocol = deserialize_server(chosen_iface.server)
+        server = chosen_iface.server
-        net_params = net_params._replace(host=host, port=port, protocol=protocol)
+        net_params = net_params._replace(host=server.host,
+                                         port=str(server.port),
+                                         protocol=server.protocol)
         await self.set_parameters(net_params)
 
-    async def follow_chain_given_server(self, server_str: str) -> None:
+    async def follow_chain_given_server(self, server: ServerAddr) -> None:
         # note that server_str should correspond to a connected interface
-        iface = self.interfaces.get(server_str)
+        iface = self.interfaces.get(server)
         if iface is None:
             return
         self._set_preferred_chain(iface.blockchain)
         # switch to server (and save to config)
         net_params = self.get_parameters()
-        host, port, protocol = deserialize_server(server_str)
+        net_params = net_params._replace(host=server.host,
-        net_params = net_params._replace(host=host, port=port, protocol=protocol)
+                                         port=str(server.port),
+                                         protocol=server.protocol)
         await self.set_parameters(net_params)
 
     def get_local_height(self):
@@ -1107,7 +1116,7 @@ class Network(Logger):
         assert not self.connecting and not self.server_queue
         self.logger.info('starting network')
         self.disconnected_servers = set([])
-        self.protocol = deserialize_server(self.default_server)[2]
+        self.protocol = self.default_server.protocol
         self.server_queue = queue.Queue()
         self._set_proxy(deserialize_proxy(self.config.get('proxy')))
         self._set_oneserver(self.config.get('oneserver', False))
@@ -1147,9 +1156,9 @@ class Network(Logger):
             await asyncio.wait_for(self.taskgroup.cancel_remaining(), timeout=2)
         except (asyncio.TimeoutError, asyncio.CancelledError) as e:
             self.logger.info(f"exc during main_taskgroup cancellation: {repr(e)}")
-        self.taskgroup = None  # type: TaskGroup
+        self.taskgroup = None
-        self.interface = None  # type: Interface
+        self.interface = None
-        self.interfaces = {}  # type: Dict[str, Interface]
+        self.interfaces = {}
         self.connecting.clear()
         self.server_queue = None
         if not full_shutdown:
@@ -1268,8 +1277,8 @@ class Network(Logger):
 
     async def send_multiple_requests(self, servers: List[str], method: str, params: Sequence):
         responses = dict()
-        async def get_response(server):
+        async def get_response(server: ServerAddr):
-            interface = Interface(self, server, self.proxy)
+            interface = Interface(network=self, server=server, proxy=self.proxy)
             timeout = self.get_network_timeout_seconds(NetworkTimeout.Urgent)
             try:
                 await asyncio.wait_for(interface.ready, timeout)
@@ -1283,5 +1292,6 @@ class Network(Logger):
             responses[interface.server] = res
         async with TaskGroup() as group:
             for server in servers:
+                server = ServerAddr.from_str(server)
                 await group.spawn(get_response(server))
         return responses