mirror of
https://github.com/LBRYFoundation/LBRY-Vault.git
synced 2025-08-23 17:47:31 +00:00
589 lines
26 KiB
Python
589 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Electrum - lightweight Bitcoin client
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# Copyright (C) 2018 The Electrum developers
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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from datetime import datetime
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import time
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import random
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import queue
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import os
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import json
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import threading
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import concurrent
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from collections import defaultdict
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from typing import Sequence, List, Tuple, Optional, Dict, NamedTuple, TYPE_CHECKING, Set
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import binascii
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import base64
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from sqlalchemy import Column, ForeignKey, Integer, String, Boolean
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from sqlalchemy.orm.query import Query
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.sql import not_, or_
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from .sql_db import SqlDB, sql
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from . import constants
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from .util import bh2u, profiler, get_headers_dir, bfh, is_ip_address, list_enabled_bits, print_msg, chunks
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from .logging import Logger
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from .storage import JsonDB
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from .lnverifier import LNChannelVerifier, verify_sig_for_channel_update
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from .crypto import sha256d
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from . import ecc
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from .lnutil import (LN_GLOBAL_FEATURES_KNOWN_SET, LNPeerAddr, NUM_MAX_EDGES_IN_PAYMENT_PATH,
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NotFoundChanAnnouncementForUpdate)
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from .lnmsg import encode_msg
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if TYPE_CHECKING:
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from .lnchannel import Channel
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from .network import Network
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class UnknownEvenFeatureBits(Exception): pass
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def validate_features(features : int):
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enabled_features = list_enabled_bits(features)
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for fbit in enabled_features:
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if (1 << fbit) not in LN_GLOBAL_FEATURES_KNOWN_SET and fbit % 2 == 0:
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raise UnknownEvenFeatureBits()
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Base = declarative_base()
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FLAG_DISABLE = 1 << 1
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FLAG_DIRECTION = 1 << 0
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class ChannelInfo(Base):
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__tablename__ = 'channel_info'
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short_channel_id = Column(String(64), primary_key=True)
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node1_id = Column(String(66), ForeignKey('node_info.node_id'), nullable=False)
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node2_id = Column(String(66), ForeignKey('node_info.node_id'), nullable=False)
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capacity_sat = Column(Integer)
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msg_payload_hex = Column(String(1024), nullable=False)
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trusted = Column(Boolean, nullable=False)
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@staticmethod
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def from_msg(payload):
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features = int.from_bytes(payload['features'], 'big')
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validate_features(features)
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channel_id = payload['short_channel_id'].hex()
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node_id_1 = payload['node_id_1'].hex()
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node_id_2 = payload['node_id_2'].hex()
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assert list(sorted([node_id_1, node_id_2])) == [node_id_1, node_id_2]
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msg_payload_hex = encode_msg('channel_announcement', **payload).hex()
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capacity_sat = None
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return ChannelInfo(short_channel_id = channel_id, node1_id = node_id_1,
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node2_id = node_id_2, capacity_sat = capacity_sat, msg_payload_hex = msg_payload_hex,
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trusted = False)
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@property
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def msg_payload(self):
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return bytes.fromhex(self.msg_payload_hex)
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class Policy(Base):
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__tablename__ = 'policy'
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start_node = Column(String(66), ForeignKey('node_info.node_id'), primary_key=True)
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short_channel_id = Column(String(64), ForeignKey('channel_info.short_channel_id'), primary_key=True)
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cltv_expiry_delta = Column(Integer, nullable=False)
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htlc_minimum_msat = Column(Integer, nullable=False)
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htlc_maximum_msat = Column(Integer)
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fee_base_msat = Column(Integer, nullable=False)
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fee_proportional_millionths = Column(Integer, nullable=False)
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channel_flags = Column(Integer, nullable=False)
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timestamp = Column(Integer, nullable=False)
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@staticmethod
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def from_msg(payload):
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cltv_expiry_delta = int.from_bytes(payload['cltv_expiry_delta'], "big")
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htlc_minimum_msat = int.from_bytes(payload['htlc_minimum_msat'], "big")
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htlc_maximum_msat = int.from_bytes(payload['htlc_maximum_msat'], "big") if 'htlc_maximum_msat' in payload else None
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fee_base_msat = int.from_bytes(payload['fee_base_msat'], "big")
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fee_proportional_millionths = int.from_bytes(payload['fee_proportional_millionths'], "big")
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channel_flags = int.from_bytes(payload['channel_flags'], "big")
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timestamp = int.from_bytes(payload['timestamp'], "big")
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start_node = payload['start_node'].hex()
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short_channel_id = payload['short_channel_id'].hex()
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return Policy(start_node=start_node,
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short_channel_id=short_channel_id,
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cltv_expiry_delta=cltv_expiry_delta,
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htlc_minimum_msat=htlc_minimum_msat,
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fee_base_msat=fee_base_msat,
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fee_proportional_millionths=fee_proportional_millionths,
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channel_flags=channel_flags,
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timestamp=timestamp,
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htlc_maximum_msat=htlc_maximum_msat)
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def is_disabled(self):
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return self.channel_flags & FLAG_DISABLE
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class NodeInfo(Base):
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__tablename__ = 'node_info'
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node_id = Column(String(66), primary_key=True, sqlite_on_conflict_primary_key='REPLACE')
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features = Column(Integer, nullable=False)
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timestamp = Column(Integer, nullable=False)
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alias = Column(String(64), nullable=False)
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@staticmethod
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def from_msg(payload):
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node_id = payload['node_id'].hex()
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features = int.from_bytes(payload['features'], "big")
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validate_features(features)
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addresses = NodeInfo.parse_addresses_field(payload['addresses'])
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alias = payload['alias'].rstrip(b'\x00').hex()
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timestamp = int.from_bytes(payload['timestamp'], "big")
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return NodeInfo(node_id=node_id, features=features, timestamp=timestamp, alias=alias), [
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Address(host=host, port=port, node_id=node_id, last_connected_date=None) for host, port in addresses]
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@staticmethod
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def parse_addresses_field(addresses_field):
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buf = addresses_field
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def read(n):
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nonlocal buf
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data, buf = buf[0:n], buf[n:]
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return data
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addresses = []
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while buf:
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atype = ord(read(1))
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if atype == 0:
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pass
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elif atype == 1: # IPv4
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ipv4_addr = '.'.join(map(lambda x: '%d' % x, read(4)))
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port = int.from_bytes(read(2), 'big')
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if is_ip_address(ipv4_addr) and port != 0:
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addresses.append((ipv4_addr, port))
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elif atype == 2: # IPv6
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ipv6_addr = b':'.join([binascii.hexlify(read(2)) for i in range(8)])
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ipv6_addr = ipv6_addr.decode('ascii')
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port = int.from_bytes(read(2), 'big')
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if is_ip_address(ipv6_addr) and port != 0:
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addresses.append((ipv6_addr, port))
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elif atype == 3: # onion v2
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host = base64.b32encode(read(10)) + b'.onion'
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host = host.decode('ascii').lower()
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port = int.from_bytes(read(2), 'big')
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addresses.append((host, port))
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elif atype == 4: # onion v3
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host = base64.b32encode(read(35)) + b'.onion'
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host = host.decode('ascii').lower()
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port = int.from_bytes(read(2), 'big')
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addresses.append((host, port))
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else:
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# unknown address type
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# we don't know how long it is -> have to escape
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# if there are other addresses we could have parsed later, they are lost.
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break
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return addresses
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class Address(Base):
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__tablename__ = 'address'
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node_id = Column(String(66), ForeignKey('node_info.node_id'), primary_key=True)
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host = Column(String(256), primary_key=True)
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port = Column(Integer, primary_key=True)
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last_connected_date = Column(Integer(), nullable=True)
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class ChannelDB(SqlDB):
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NUM_MAX_RECENT_PEERS = 20
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def __init__(self, network: 'Network'):
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path = os.path.join(get_headers_dir(network.config), 'channel_db')
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super().__init__(network, path, Base)
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self.num_nodes = 0
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self.num_channels = 0
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self._channel_updates_for_private_channels = {} # type: Dict[Tuple[bytes, bytes], dict]
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self.ca_verifier = LNChannelVerifier(network, self)
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self.update_counts()
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@sql
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def update_counts(self):
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self._update_counts()
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def _update_counts(self):
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self.num_channels = self.DBSession.query(ChannelInfo).count()
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self.num_policies = self.DBSession.query(Policy).count()
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self.num_nodes = self.DBSession.query(NodeInfo).count()
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@sql
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def known_ids(self):
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known = self.DBSession.query(ChannelInfo.short_channel_id).all()
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return set(bfh(r.short_channel_id) for r in known)
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@sql
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def add_recent_peer(self, peer: LNPeerAddr):
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now = int(time.time())
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node_id = peer.pubkey.hex()
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addr = self.DBSession.query(Address).filter_by(node_id=node_id, host=peer.host, port=peer.port).one_or_none()
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if addr:
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addr.last_connected_date = now
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else:
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addr = Address(node_id=node_id, host=peer.host, port=peer.port, last_connected_date=now)
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self.DBSession.add(addr)
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self.DBSession.commit()
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@sql
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def get_200_randomly_sorted_nodes_not_in(self, node_ids_bytes):
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unshuffled = self.DBSession \
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.query(NodeInfo) \
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.filter(not_(NodeInfo.node_id.in_(x.hex() for x in node_ids_bytes))) \
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.limit(200) \
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.all()
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return random.sample(unshuffled, len(unshuffled))
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@sql
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def nodes_get(self, node_id):
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return self.DBSession \
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.query(NodeInfo) \
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.filter_by(node_id = node_id.hex()) \
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.one_or_none()
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@sql
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def get_last_good_address(self, node_id) -> Optional[LNPeerAddr]:
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r = self.DBSession.query(Address).filter_by(node_id=node_id.hex()).order_by(Address.last_connected_date.desc()).all()
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if not r:
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return None
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addr = r[0]
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return LNPeerAddr(addr.host, addr.port, bytes.fromhex(addr.node_id))
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@sql
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def get_recent_peers(self):
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r = self.DBSession.query(Address).filter(Address.last_connected_date.isnot(None)).order_by(Address.last_connected_date.desc()).limit(self.NUM_MAX_RECENT_PEERS).all()
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return [LNPeerAddr(x.host, x.port, bytes.fromhex(x.node_id)) for x in r]
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@sql
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def missing_channel_announcements(self) -> Set[int]:
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expr = not_(Policy.short_channel_id.in_(self.DBSession.query(ChannelInfo.short_channel_id)))
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return set(x[0] for x in self.DBSession.query(Policy.short_channel_id).filter(expr).all())
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@sql
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def missing_channel_updates(self) -> Set[int]:
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expr = not_(ChannelInfo.short_channel_id.in_(self.DBSession.query(Policy.short_channel_id)))
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return set(x[0] for x in self.DBSession.query(ChannelInfo.short_channel_id).filter(expr).all())
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@sql
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def add_verified_channel_info(self, short_id, capacity):
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# called from lnchannelverifier
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channel_info = self.DBSession.query(ChannelInfo).filter_by(short_channel_id = short_id.hex()).one_or_none()
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channel_info.trusted = True
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channel_info.capacity = capacity
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self.DBSession.commit()
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@sql
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@profiler
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def on_channel_announcement(self, msg_payloads, trusted=True):
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if type(msg_payloads) is dict:
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msg_payloads = [msg_payloads]
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new_channels = {}
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for msg in msg_payloads:
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short_channel_id = bh2u(msg['short_channel_id'])
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if self.DBSession.query(ChannelInfo).filter_by(short_channel_id=short_channel_id).count():
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continue
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if constants.net.rev_genesis_bytes() != msg['chain_hash']:
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self.logger.info("ChanAnn has unexpected chain_hash {}".format(bh2u(msg['chain_hash'])))
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continue
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try:
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channel_info = ChannelInfo.from_msg(msg)
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except UnknownEvenFeatureBits:
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self.logger.info("unknown feature bits")
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continue
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channel_info.trusted = trusted
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new_channels[short_channel_id] = channel_info
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if not trusted:
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self.ca_verifier.add_new_channel_info(channel_info.short_channel_id, channel_info.msg_payload)
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for channel_info in new_channels.values():
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self.DBSession.add(channel_info)
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self.DBSession.commit()
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self._update_counts()
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self.logger.debug('on_channel_announcement: %d/%d'%(len(new_channels), len(msg_payloads)))
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@sql
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def get_last_timestamp(self):
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return self._get_last_timestamp()
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def _get_last_timestamp(self):
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from sqlalchemy.sql import func
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r = self.DBSession.query(func.max(Policy.timestamp).label('max_timestamp')).one()
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return r.max_timestamp or 0
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def print_change(self, old_policy, new_policy):
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# print what changed between policies
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if old_policy.cltv_expiry_delta != new_policy.cltv_expiry_delta:
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self.logger.info(f'cltv_expiry_delta: {old_policy.cltv_expiry_delta} -> {new_policy.cltv_expiry_delta}')
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if old_policy.htlc_minimum_msat != new_policy.htlc_minimum_msat:
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self.logger.info(f'htlc_minimum_msat: {old_policy.htlc_minimum_msat} -> {new_policy.htlc_minimum_msat}')
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if old_policy.htlc_maximum_msat != new_policy.htlc_maximum_msat:
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self.logger.info(f'htlc_maximum_msat: {old_policy.htlc_maximum_msat} -> {new_policy.htlc_maximum_msat}')
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if old_policy.fee_base_msat != new_policy.fee_base_msat:
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self.logger.info(f'fee_base_msat: {old_policy.fee_base_msat} -> {new_policy.fee_base_msat}')
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if old_policy.fee_proportional_millionths != new_policy.fee_proportional_millionths:
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self.logger.info(f'fee_proportional_millionths: {old_policy.fee_proportional_millionths} -> {new_policy.fee_proportional_millionths}')
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if old_policy.channel_flags != new_policy.channel_flags:
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self.logger.info(f'channel_flags: {old_policy.channel_flags} -> {new_policy.channel_flags}')
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@sql
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def get_info_for_updates(self, payloads):
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short_channel_ids = [payload['short_channel_id'].hex() for payload in payloads]
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channel_infos_list = self.DBSession.query(ChannelInfo).filter(ChannelInfo.short_channel_id.in_(short_channel_ids)).all()
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channel_infos = {bfh(x.short_channel_id): x for x in channel_infos_list}
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return channel_infos
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@sql
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def get_policies_for_updates(self, payloads):
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out = {}
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for payload in payloads:
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short_channel_id = payload['short_channel_id'].hex()
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start_node = payload['start_node'].hex()
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policy = self.DBSession.query(Policy).filter_by(short_channel_id=short_channel_id, start_node=start_node).one_or_none()
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if policy:
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out[short_channel_id+start_node] = policy
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return out
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@profiler
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def filter_channel_updates(self, payloads, max_age=None):
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orphaned = [] # no channel announcement for channel update
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expired = [] # update older than two weeks
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deprecated = [] # update older than database entry
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good = {} # good updates
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to_delete = [] # database entries to delete
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# filter orphaned and expired first
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known = []
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now = int(time.time())
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channel_infos = self.get_info_for_updates(payloads)
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for payload in payloads:
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short_channel_id = payload['short_channel_id']
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timestamp = int.from_bytes(payload['timestamp'], "big")
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if max_age and now - timestamp > max_age:
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expired.append(short_channel_id)
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continue
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channel_info = channel_infos.get(short_channel_id)
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if not channel_info:
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orphaned.append(short_channel_id)
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continue
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flags = int.from_bytes(payload['channel_flags'], 'big')
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direction = flags & FLAG_DIRECTION
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start_node = channel_info.node1_id if direction == 0 else channel_info.node2_id
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payload['start_node'] = bfh(start_node)
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known.append(payload)
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# compare updates to existing database entries
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old_policies = self.get_policies_for_updates(known)
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for payload in known:
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timestamp = int.from_bytes(payload['timestamp'], "big")
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start_node = payload['start_node']
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short_channel_id = payload['short_channel_id']
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key = (short_channel_id+start_node).hex()
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old_policy = old_policies.get(key)
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if old_policy:
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if timestamp <= old_policy.timestamp:
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deprecated.append(short_channel_id)
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else:
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good[key] = payload
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to_delete.append(old_policy)
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else:
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good[key] = payload
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good = list(good.values())
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return orphaned, expired, deprecated, good, to_delete
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def add_channel_update(self, payload):
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orphaned, expired, deprecated, good, to_delete = self.filter_channel_updates([payload])
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assert len(good) == 1
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self.update_policies(good, to_delete)
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@sql
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@profiler
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def update_policies(self, to_add, to_delete):
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for policy in to_delete:
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self.DBSession.delete(policy)
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self.DBSession.commit()
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for payload in to_add:
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policy = Policy.from_msg(payload)
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self.DBSession.add(policy)
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self.DBSession.commit()
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self._update_counts()
|
|
|
|
@sql
|
|
@profiler
|
|
def on_node_announcement(self, msg_payloads):
|
|
if type(msg_payloads) is dict:
|
|
msg_payloads = [msg_payloads]
|
|
old_addr = None
|
|
new_nodes = {}
|
|
new_addresses = {}
|
|
for msg_payload in msg_payloads:
|
|
try:
|
|
node_info, node_addresses = NodeInfo.from_msg(msg_payload)
|
|
except UnknownEvenFeatureBits:
|
|
continue
|
|
node_id = node_info.node_id
|
|
# Ignore node if it has no associated channel (DoS protection)
|
|
# FIXME this is slow
|
|
expr = or_(ChannelInfo.node1_id==node_id, ChannelInfo.node2_id==node_id)
|
|
if len(self.DBSession.query(ChannelInfo.short_channel_id).filter(expr).limit(1).all()) == 0:
|
|
#self.logger.info('ignoring orphan node_announcement')
|
|
continue
|
|
node = self.DBSession.query(NodeInfo).filter_by(node_id=node_id).one_or_none()
|
|
if node and node.timestamp >= node_info.timestamp:
|
|
continue
|
|
node = new_nodes.get(node_id)
|
|
if node and node.timestamp >= node_info.timestamp:
|
|
continue
|
|
new_nodes[node_id] = node_info
|
|
for addr in node_addresses:
|
|
new_addresses[(addr.node_id,addr.host,addr.port)] = addr
|
|
self.logger.debug("on_node_announcement: %d/%d"%(len(new_nodes), len(msg_payloads)))
|
|
for node_info in new_nodes.values():
|
|
self.DBSession.add(node_info)
|
|
for new_addr in new_addresses.values():
|
|
old_addr = self.DBSession.query(Address).filter_by(node_id=new_addr.node_id, host=new_addr.host, port=new_addr.port).one_or_none()
|
|
if not old_addr:
|
|
self.DBSession.add(new_addr)
|
|
self.DBSession.commit()
|
|
self._update_counts()
|
|
|
|
def get_routing_policy_for_channel(self, start_node_id: bytes,
|
|
short_channel_id: bytes) -> Optional[bytes]:
|
|
if not start_node_id or not short_channel_id: return None
|
|
channel_info = self.get_channel_info(short_channel_id)
|
|
if channel_info is not None:
|
|
return self.get_policy_for_node(short_channel_id, start_node_id)
|
|
msg = self._channel_updates_for_private_channels.get((start_node_id, short_channel_id))
|
|
if not msg:
|
|
return None
|
|
return Policy.from_msg(msg) # won't actually be written to DB
|
|
|
|
@sql
|
|
@profiler
|
|
def get_old_policies(self, delta):
|
|
timestamp = int(time.time()) - delta
|
|
old_policies = self.DBSession.query(Policy.short_channel_id).filter(Policy.timestamp <= timestamp)
|
|
return old_policies.distinct().count()
|
|
|
|
@sql
|
|
@profiler
|
|
def prune_old_policies(self, delta):
|
|
# note: delete queries are order sensitive
|
|
timestamp = int(time.time()) - delta
|
|
old_policies = self.DBSession.query(Policy.short_channel_id).filter(Policy.timestamp <= timestamp)
|
|
delete_old_channels = ChannelInfo.__table__.delete().where(ChannelInfo.short_channel_id.in_(old_policies))
|
|
delete_old_policies = Policy.__table__.delete().where(Policy.timestamp <= timestamp)
|
|
self.DBSession.execute(delete_old_channels)
|
|
self.DBSession.execute(delete_old_policies)
|
|
self.DBSession.commit()
|
|
self._update_counts()
|
|
|
|
@sql
|
|
@profiler
|
|
def get_orphaned_channels(self):
|
|
subquery = self.DBSession.query(Policy.short_channel_id)
|
|
orphaned = self.DBSession.query(ChannelInfo).filter(not_(ChannelInfo.short_channel_id.in_(subquery)))
|
|
return orphaned.count()
|
|
|
|
@sql
|
|
@profiler
|
|
def prune_orphaned_channels(self):
|
|
subquery = self.DBSession.query(Policy.short_channel_id)
|
|
delete_orphaned = ChannelInfo.__table__.delete().where(not_(ChannelInfo.short_channel_id.in_(subquery)))
|
|
self.DBSession.execute(delete_orphaned)
|
|
self.DBSession.commit()
|
|
self._update_counts()
|
|
|
|
def add_channel_update_for_private_channel(self, msg_payload: dict, start_node_id: bytes):
|
|
if not verify_sig_for_channel_update(msg_payload, start_node_id):
|
|
return # ignore
|
|
short_channel_id = msg_payload['short_channel_id']
|
|
msg_payload['start_node'] = start_node_id
|
|
self._channel_updates_for_private_channels[(start_node_id, short_channel_id)] = msg_payload
|
|
|
|
@sql
|
|
def remove_channel(self, short_channel_id):
|
|
r = self.DBSession.query(ChannelInfo).filter_by(short_channel_id = short_channel_id.hex()).one_or_none()
|
|
if not r:
|
|
return
|
|
self.DBSession.delete(r)
|
|
self.DBSession.commit()
|
|
|
|
def print_graph(self, full_ids=False):
|
|
# used for debugging.
|
|
# FIXME there is a race here - iterables could change size from another thread
|
|
def other_node_id(node_id, channel_id):
|
|
channel_info = self.get_channel_info(channel_id)
|
|
if node_id == channel_info.node1_id:
|
|
other = channel_info.node2_id
|
|
else:
|
|
other = channel_info.node1_id
|
|
return other if full_ids else other[-4:]
|
|
|
|
print_msg('nodes')
|
|
for node in self.DBSession.query(NodeInfo).all():
|
|
print_msg(node)
|
|
|
|
print_msg('channels')
|
|
for channel_info in self.DBSession.query(ChannelInfo).all():
|
|
short_channel_id = channel_info.short_channel_id
|
|
node1 = channel_info.node1_id
|
|
node2 = channel_info.node2_id
|
|
direction1 = self.get_policy_for_node(channel_info, node1) is not None
|
|
direction2 = self.get_policy_for_node(channel_info, node2) is not None
|
|
if direction1 and direction2:
|
|
direction = 'both'
|
|
elif direction1:
|
|
direction = 'forward'
|
|
elif direction2:
|
|
direction = 'backward'
|
|
else:
|
|
direction = 'none'
|
|
print_msg('{}: {}, {}, {}'
|
|
.format(bh2u(short_channel_id),
|
|
bh2u(node1) if full_ids else bh2u(node1[-4:]),
|
|
bh2u(node2) if full_ids else bh2u(node2[-4:]),
|
|
direction))
|
|
|
|
|
|
@sql
|
|
def get_node_addresses(self, node_info):
|
|
return self.DBSession.query(Address).join(NodeInfo).filter_by(node_id = node_info.node_id).all()
|
|
|
|
@sql
|
|
@profiler
|
|
def load_data(self):
|
|
r = self.DBSession.query(ChannelInfo).all()
|
|
self._channels = dict([(bfh(x.short_channel_id), x) for x in r])
|
|
r = self.DBSession.query(Policy).filter_by().all()
|
|
self._policies = dict([((bfh(x.start_node), bfh(x.short_channel_id)), x) for x in r])
|
|
self._channels_for_node = defaultdict(set)
|
|
for channel_info in self._channels.values():
|
|
self._channels_for_node[bfh(channel_info.node1_id)].add(bfh(channel_info.short_channel_id))
|
|
self._channels_for_node[bfh(channel_info.node2_id)].add(bfh(channel_info.short_channel_id))
|
|
self.logger.info(f'load data {len(self._channels)} {len(self._policies)} {len(self._channels_for_node)}')
|
|
|
|
def get_policy_for_node(self, short_channel_id: bytes, node_id: bytes) -> Optional['Policy']:
|
|
return self._policies.get((node_id, short_channel_id))
|
|
|
|
def get_channel_info(self, channel_id: bytes):
|
|
return self._channels.get(channel_id)
|
|
|
|
def get_channels_for_node(self, node_id) -> Set[bytes]:
|
|
"""Returns the set of channels that have node_id as one of the endpoints."""
|
|
return self._channels_for_node.get(node_id) or set()
|
|
|
|
|
|
|