mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-12-29 10:04:41 +01:00
359 lines
13 KiB
Python
359 lines
13 KiB
Python
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from binascii import hexlify
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from pathlib import Path
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import io
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import os
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import logging
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import struct
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class GossipStore(object):
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"""A pythonic way to interact/introspect the gossip_store"""
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def __init__(self, path: Path):
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self.fd = None
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self.version = None
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self.path = path
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self.log = logging.getLogger("GossipStore")
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def open(self):
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self.fd = self.path.open(mode="rb")
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self.version = ord(self.fd.read(1))
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if self.version < 3:
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raise ValueError(
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f"gossip_store below version 3 is not supported: {self.version}"
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)
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def reset(self):
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"""Seek back to the beginning of the store."""
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self.log.debug("Resetting file position to 1")
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self.fd.seek(1, os.SEEK_SET)
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@classmethod
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def maybe_parse(cls, msg: bytes):
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parsers = {
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256: ChannelAnnouncement,
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257: NodeAnnouncement,
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258: ChannelUpdate,
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4104: LocalChannelAnnouncement,
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4102: LocalChannelUpdate,
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}
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(typ,) = struct.unpack_from("!H", msg)
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parser = parsers.get(typ, None)
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logging.debug(f"Picking parser for type={typ} -> {parser}")
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if parser is not None:
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return parser.from_bytes(io.BytesIO(msg[2:]))
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else:
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return msg
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def __next__(self):
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hdr = self.fd.read(12)
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if len(hdr) < 12:
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raise StopIteration
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length, crc, timestamp = struct.unpack("!III", hdr)
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# deleted = (length & 0x80000000 != 0)
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# important = (length & 0x40000000 != 0)
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length = length & (~0x80000000) & (~0x40000000)
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print(f"Reading message length={length} at position={self.fd.tell()}")
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msg = self.fd.read(length)
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if len(msg) != length:
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raise ValueError(
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f"Incomplete gossip_store: expected {length} bytes, got {len(msg)} at pos {self.fd.tell()}"
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)
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return GossipStore.maybe_parse(msg)
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def __iter__(self):
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"""Return a copy of ourselves as iterator."""
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inst = GossipStore(self.path)
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inst.open()
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return inst
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class ChannelAnnouncement(object):
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def __init__(self):
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self.num_short_channel_id = None
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self.node_signatures = [None, None]
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self.bitcoin_signatures = [None, None]
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self.features = None
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self.chain_hash = None
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self.node_ids = [None, None]
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self.bitcoin_keys = [None, None]
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@classmethod
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def from_bytes(cls, b: io.BytesIO) -> "ChannelAnnouncement":
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ca = cls()
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ca.node_signatures = (b.read(64), b.read(64))
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ca.bitcoin_signatures = (b.read(64), b.read(64))
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(flen,) = struct.unpack("!H", b.read(2))
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ca.features = b.read(flen)
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ca.chain_hash = b.read(32)[::-1]
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(ca.num_short_channel_id,) = struct.unpack("!Q", b.read(8))
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ca.node_ids = (b.read(33), b.read(33))
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ca.bitcoin_keys = (b.read(33), b.read(33))
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return ca
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@property
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def short_channel_id(self):
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return "{}x{}x{}".format(
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(self.num_short_channel_id >> 40) & 0xFFFFFF,
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(self.num_short_channel_id >> 16) & 0xFFFFFF,
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(self.num_short_channel_id >> 00) & 0xFFFF,
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)
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def __eq__(self, other):
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return (
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self.num_short_channel_id == other.num_short_channel_id
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and self.bitcoin_keys == other.bitcoin_keys
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and self.chain_hash == other.chain_hash
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and self.node_ids == other.node_ids
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and self.features == other.features
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)
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def __str__(self):
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na = hexlify(self.node_ids[0]).decode("ASCII")
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nb = hexlify(self.node_ids[1]).decode("ASCII")
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return f"ChannelAnnouncement(scid={self.short_channel_id}, nodes=[{na},{nb}])"
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class NodeAnnouncement(object):
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def __init__(self):
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self.signature = None
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self.features = ""
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self.timestamp = None
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self.node_id = None
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self.rgb_color = None
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self.alias = None
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self.addresses = None
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@classmethod
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def from_bytes(cls, b: io.BytesIO) -> "NodeAnnouncement":
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na = cls()
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na.signature = b.read(64)
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(flen,) = struct.unpack("!H", b.read(2))
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na.features = b.read(flen)
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(na.timestamp,) = struct.unpack("!I", b.read(4))
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na.node_id = b.read(33)
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na.rgb_color = b.read(3)
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na.alias = b.read(32)
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(alen,) = struct.unpack("!H", b.read(2))
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abytes = io.BytesIO(b.read(alen))
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na.addresses = []
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while True:
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addr = Address.from_bytes(abytes)
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if addr is None:
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break
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else:
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na.addresses.append(addr)
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return na
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def __str__(self):
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return f"NodeAnnouncement(id={hexlify(self.node_id)}, alias={self.alias}, color={self.rgb_color})"
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def __eq__(self, other):
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return (
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self.features == other.features
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and self.timestamp == other.timestamp
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and self.node_id == other.node_id
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and self.rgb_color == other.rgb_color
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and self.alias == other.alias
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)
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class Address(object):
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def __init__(self, typ=None, addr=None, port=None):
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self.typ = typ
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self.addr = addr
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self.port = port
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@classmethod
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def from_bytes(cls, b: io.BytesIO) -> "Address":
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a = cls()
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t = b.read(1)
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if len(t) != 1:
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return None
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(a.typ,) = struct.unpack("!B", t)
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if a.typ == 1:
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a.addr = b.read(4)
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elif a.typ == 2:
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a.addr = b.read(16)
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elif a.typ == 3:
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a.addr = b.read(10)
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elif a.typ == 4:
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a.addr = b.read(35)
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else:
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print(f"Unknown address type {a.typ}")
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return None
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(a.port,) = struct.unpack("!H", b.read(2))
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return a
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def __eq__(self, other):
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return (
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self.typ == other.typ
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and self.addr == other.addr
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and self.port == other.port
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)
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def __len__(self):
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l = {
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1: 6,
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2: 18,
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3: 12,
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4: 37,
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}
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return l[self.typ] + 1
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def __str__(self):
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addr = self.addr
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if self.typ == 1:
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addr = ".".join([str(c) for c in addr])
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protos = {
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1: "ipv4",
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2: "ipv6",
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3: "torv2",
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4: "torv3",
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}
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return f"{protos[self.typ]}://{addr}:{self.port}"
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class ChannelUpdate(object):
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def __init__(self):
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self.signature = None
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self.chain_hash = None
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self.num_short_channel_id = None
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self.timestamp = None
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self.message_flags = None
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self.channel_flags = None
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self.cltv_expiry_delta = None
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self.htlc_minimum_msat = None
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self.fee_base_msat = None
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self.fee_proportional_millionths = None
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self.htlc_maximum_msat = None
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@classmethod
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def from_bytes(cls, b: io.BytesIO) -> "ChannelUpdate":
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cu = ChannelUpdate()
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cu.signature = b.read(64)
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cu.chain_hash = b.read(32)[::-1]
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(cu.num_short_channel_id,) = struct.unpack("!Q", b.read(8))
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(cu.timestamp,) = struct.unpack("!I", b.read(4))
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cu.message_flags = b.read(1)
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cu.channel_flags = b.read(1)
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(cu.cltv_expiry_delta,) = struct.unpack("!H", b.read(2))
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(cu.htlc_minimum_msat,) = struct.unpack("!Q", b.read(8))
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(cu.fee_base_msat,) = struct.unpack("!I", b.read(4))
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(cu.fee_proportional_millionths,) = struct.unpack("!I", b.read(4))
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t = b.read(8)
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if len(t) == 8:
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(cu.htlc_maximum_msat,) = struct.unpack("!Q", t)
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else:
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cu.htlc_maximum_msat = None
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return cu
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@property
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def short_channel_id(self):
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return "{}x{}x{}".format(
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(self.num_short_channel_id >> 40) & 0xFFFFFF,
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(self.num_short_channel_id >> 16) & 0xFFFFFF,
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(self.num_short_channel_id >> 00) & 0xFFFF,
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)
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@property
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def direction(self):
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(b,) = struct.unpack("!B", self.channel_flags)
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return b & 0x01
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def serialize(self):
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raise ValueError()
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def __str__(self):
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return "ChannelUpdate(scid={short_channel_id}, timestamp={timestamp})".format(
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timestamp=self.timestamp, short_channel_id=self.short_channel_id
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)
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def __eq__(self, other):
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return (
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self.chain_hash == other.chain_hash
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and self.num_short_channel_id == other.num_short_channel_id
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and self.timestamp == other.timestamp
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and self.message_flags == other.message_flags
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and self.channel_flags == other.channel_flags
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and self.cltv_expiry_delta == other.cltv_expiry_delta
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and self.htlc_minimum_msat == other.htlc_minimum_msat
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and self.fee_base_msat == other.fee_base_msat
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and self.fee_proportional_millionths == other.fee_proportional_millionths
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and self.htlc_maximum_msat == other.htlc_maximum_msat
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)
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class LocalChannelAnnouncement(object):
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def __init__(self):
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self.inner = None
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self.satoshis = None
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@classmethod
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def from_bytes(cls, b: io.BytesIO) -> "LocalChannelAnnouncement":
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lca = LocalChannelAnnouncement()
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(lca.satoshis,) = struct.unpack("!Q", b.read(8))
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b.read(4) # Skip length prefix
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lca.inner = ChannelAnnouncement.from_bytes(b)
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return lca
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def __str__(self):
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return f"LocalChannelAnnouncement[satoshis={self.satoshis},inner={self.inner}]"
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class LocalChannelUpdate(object):
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def __init__(self):
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self.inner = None
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@classmethod
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def from_bytes(cls, b: io.BytesIO) -> "LocalChannelUpdate":
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b.read(2) # Skip length prefix
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lcu = LocalChannelUpdate()
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lcu.inner = ChannelUpdate.from_bytes(b)
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return lcu
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def __str__(self):
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return f"LocalChannelUpdate[inner={self.inner}]"
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def test_gossip_store():
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from binascii import unhexlify
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a = io.BytesIO(
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unhexlify(
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"09000001bc55786b7f00000000100800000000000f315901b0010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006226e46111a0b59caaf126043eb5bbf28c34f3a5e332a1fc7b2b73cf188910f4101dd37cfe5d2c2022d223620a359a47ff7f7ac447c85c46c923da53389221a0054c11c1e3ca31d590266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f000001bc0209e6ea00000000100800000000000f315901b0010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006226e46111a0b59caaf126043eb5bbf28c34f3a5e332a1fc7b2b73cf188910f80294ac02207027d022d223620a359a47ff7f7ac447c85c46c923da53389221a0054c11c1e3ca31d590266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f0000008eb7783081000000001006008a01022924a3f31a937ddf122181b7e9753316b66330afd88ab297d82efb4d4d7065de5e2dd9a234a9f3c6604ca2027f6a2d2d752d795cf915eea6ab40765e6d20cf4206226e46111a0b59caaf126043eb5bbf28c34f3a5e332a1fc7b2b73cf188910f80294ac02207027d628e5c04010100060000000000000000000000010000000a000000003ac0d9080000008ece416a0a000000001006008a010207a76fac2089f27cd3b088291930bc1c95d739e01fea38fbbc6d2712b112579f34b8320f566155eb1cb7d34f2f2114d4004b3c6200f706c882a5659f16a16f0406226e46111a0b59caaf126043eb5bbf28c34f3a5e332a1fc7b2b73cf188910f4101dd37cfe5d2c2628e5c04010000060000000000000000000000010000000a000000003ac0d908"
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)
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)
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|
|
|
||
|
|
a.read(1)
|
||
|
|
a.read(12)
|
||
|
|
assert a.read(2) == b"\x10\x08"
|
||
|
|
|
||
|
|
ca = LocalChannelAnnouncement.from_bytes(a)
|
||
|
|
print(ca)
|
||
|
|
a.read(12)
|
||
|
|
assert a.read(2) == b"\x10\x08"
|
||
|
|
ca = LocalChannelAnnouncement.from_bytes(a)
|
||
|
|
print(ca)
|
||
|
|
|
||
|
|
a.read(12)
|
||
|
|
assert a.read(2) == b"\x10\x06"
|
||
|
|
cu = LocalChannelUpdate.from_bytes(a)
|
||
|
|
print(cu)
|
||
|
|
|
||
|
|
a.read(12)
|
||
|
|
assert a.read(2) == b"\x10\x06"
|
||
|
|
cu = LocalChannelUpdate.from_bytes(a)
|
||
|
|
print(cu)
|