527 lines
24 KiB
Python
527 lines
24 KiB
Python
import os
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import csv
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import io
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from typing import Callable, Tuple, Any, Dict, List, Sequence, Union, Optional
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from collections import OrderedDict
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from .lnutil import OnionFailureCodeMetaFlag
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class FailedToParseMsg(Exception): pass
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class UnknownMsgType(FailedToParseMsg): pass
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class UnknownOptionalMsgType(UnknownMsgType): pass
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class UnknownMandatoryMsgType(UnknownMsgType): pass
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class MalformedMsg(FailedToParseMsg): pass
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class UnknownMsgFieldType(MalformedMsg): pass
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class UnexpectedEndOfStream(MalformedMsg): pass
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class FieldEncodingNotMinimal(MalformedMsg): pass
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class UnknownMandatoryTLVRecordType(MalformedMsg): pass
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class MsgTrailingGarbage(MalformedMsg): pass
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class MsgInvalidFieldOrder(MalformedMsg): pass
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class UnexpectedFieldSizeForEncoder(MalformedMsg): pass
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def _num_remaining_bytes_to_read(fd: io.BytesIO) -> int:
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cur_pos = fd.tell()
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end_pos = fd.seek(0, io.SEEK_END)
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fd.seek(cur_pos)
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return end_pos - cur_pos
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def _assert_can_read_at_least_n_bytes(fd: io.BytesIO, n: int) -> None:
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# note: it's faster to read n bytes and then check if we read n, than
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# to assert we can read at least n and then read n bytes.
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nremaining = _num_remaining_bytes_to_read(fd)
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if nremaining < n:
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raise UnexpectedEndOfStream(f"wants to read {n} bytes but only {nremaining} bytes left")
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def write_bigsize_int(i: int) -> bytes:
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assert i >= 0, i
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if i < 0xfd:
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return int.to_bytes(i, length=1, byteorder="big", signed=False)
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elif i < 0x1_0000:
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return b"\xfd" + int.to_bytes(i, length=2, byteorder="big", signed=False)
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elif i < 0x1_0000_0000:
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return b"\xfe" + int.to_bytes(i, length=4, byteorder="big", signed=False)
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else:
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return b"\xff" + int.to_bytes(i, length=8, byteorder="big", signed=False)
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def read_bigsize_int(fd: io.BytesIO) -> Optional[int]:
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try:
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first = fd.read(1)[0]
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except IndexError:
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return None # end of file
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if first < 0xfd:
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return first
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elif first == 0xfd:
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buf = fd.read(2)
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if len(buf) != 2:
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raise UnexpectedEndOfStream()
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val = int.from_bytes(buf, byteorder="big", signed=False)
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if not (0xfd <= val < 0x1_0000):
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raise FieldEncodingNotMinimal()
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return val
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elif first == 0xfe:
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buf = fd.read(4)
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if len(buf) != 4:
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raise UnexpectedEndOfStream()
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val = int.from_bytes(buf, byteorder="big", signed=False)
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if not (0x1_0000 <= val < 0x1_0000_0000):
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raise FieldEncodingNotMinimal()
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return val
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elif first == 0xff:
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buf = fd.read(8)
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if len(buf) != 8:
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raise UnexpectedEndOfStream()
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val = int.from_bytes(buf, byteorder="big", signed=False)
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if not (0x1_0000_0000 <= val):
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raise FieldEncodingNotMinimal()
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return val
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raise Exception()
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# TODO: maybe if field_type is not "byte", we could return a list of type_len sized chunks?
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# if field_type is a numeric, we could return a list of ints?
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def _read_field(*, fd: io.BytesIO, field_type: str, count: Union[int, str]) -> Union[bytes, int]:
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if not fd: raise Exception()
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if isinstance(count, int):
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assert count >= 0, f"{count!r} must be non-neg int"
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elif count == "...":
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pass
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else:
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raise Exception(f"unexpected field count: {count!r}")
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if count == 0:
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return b""
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type_len = None
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if field_type == 'byte':
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type_len = 1
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elif field_type in ('u8', 'u16', 'u32', 'u64'):
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if field_type == 'u8':
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type_len = 1
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elif field_type == 'u16':
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type_len = 2
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elif field_type == 'u32':
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type_len = 4
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else:
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assert field_type == 'u64'
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type_len = 8
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assert count == 1, count
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buf = fd.read(type_len)
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if len(buf) != type_len:
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raise UnexpectedEndOfStream()
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return int.from_bytes(buf, byteorder="big", signed=False)
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elif field_type in ('tu16', 'tu32', 'tu64'):
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if field_type == 'tu16':
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type_len = 2
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elif field_type == 'tu32':
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type_len = 4
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else:
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assert field_type == 'tu64'
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type_len = 8
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assert count == 1, count
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raw = fd.read(type_len)
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if len(raw) > 0 and raw[0] == 0x00:
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raise FieldEncodingNotMinimal()
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return int.from_bytes(raw, byteorder="big", signed=False)
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elif field_type == 'varint':
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assert count == 1, count
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val = read_bigsize_int(fd)
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if val is None:
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raise UnexpectedEndOfStream()
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return val
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elif field_type == 'chain_hash':
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type_len = 32
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elif field_type == 'channel_id':
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type_len = 32
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elif field_type == 'sha256':
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type_len = 32
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elif field_type == 'signature':
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type_len = 64
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elif field_type == 'point':
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type_len = 33
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elif field_type == 'short_channel_id':
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type_len = 8
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if count == "...":
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total_len = -1 # read all
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else:
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if type_len is None:
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raise UnknownMsgFieldType(f"unknown field type: {field_type!r}")
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total_len = count * type_len
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buf = fd.read(total_len)
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if total_len >= 0 and len(buf) != total_len:
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raise UnexpectedEndOfStream()
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return buf
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# TODO: maybe for "value" we could accept a list with len "count" of appropriate items
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def _write_field(*, fd: io.BytesIO, field_type: str, count: Union[int, str],
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value: Union[bytes, int]) -> None:
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if not fd: raise Exception()
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if isinstance(count, int):
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assert count >= 0, f"{count!r} must be non-neg int"
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elif count == "...":
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pass
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else:
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raise Exception(f"unexpected field count: {count!r}")
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if count == 0:
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return
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type_len = None
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if field_type == 'byte':
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type_len = 1
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elif field_type == 'u8':
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type_len = 1
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elif field_type == 'u16':
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type_len = 2
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elif field_type == 'u32':
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type_len = 4
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elif field_type == 'u64':
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type_len = 8
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elif field_type in ('tu16', 'tu32', 'tu64'):
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if field_type == 'tu16':
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type_len = 2
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elif field_type == 'tu32':
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type_len = 4
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else:
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assert field_type == 'tu64'
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type_len = 8
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assert count == 1, count
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if isinstance(value, int):
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value = int.to_bytes(value, length=type_len, byteorder="big", signed=False)
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if not isinstance(value, (bytes, bytearray)):
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raise Exception(f"can only write bytes into fd. got: {value!r}")
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while len(value) > 0 and value[0] == 0x00:
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value = value[1:]
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nbytes_written = fd.write(value)
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if nbytes_written != len(value):
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raise Exception(f"tried to write {len(value)} bytes, but only wrote {nbytes_written}!?")
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return
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elif field_type == 'varint':
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assert count == 1, count
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if isinstance(value, int):
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value = write_bigsize_int(value)
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if not isinstance(value, (bytes, bytearray)):
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raise Exception(f"can only write bytes into fd. got: {value!r}")
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nbytes_written = fd.write(value)
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if nbytes_written != len(value):
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raise Exception(f"tried to write {len(value)} bytes, but only wrote {nbytes_written}!?")
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return
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elif field_type == 'chain_hash':
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type_len = 32
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elif field_type == 'channel_id':
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type_len = 32
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elif field_type == 'sha256':
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type_len = 32
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elif field_type == 'signature':
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type_len = 64
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elif field_type == 'point':
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type_len = 33
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elif field_type == 'short_channel_id':
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type_len = 8
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total_len = -1
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if count != "...":
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if type_len is None:
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raise UnknownMsgFieldType(f"unknown field type: {field_type!r}")
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total_len = count * type_len
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if isinstance(value, int) and (count == 1 or field_type == 'byte'):
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value = int.to_bytes(value, length=total_len, byteorder="big", signed=False)
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if not isinstance(value, (bytes, bytearray)):
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raise Exception(f"can only write bytes into fd. got: {value!r}")
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if count != "..." and total_len != len(value):
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raise UnexpectedFieldSizeForEncoder(f"expected: {total_len}, got {len(value)}")
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nbytes_written = fd.write(value)
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if nbytes_written != len(value):
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raise Exception(f"tried to write {len(value)} bytes, but only wrote {nbytes_written}!?")
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def _read_tlv_record(*, fd: io.BytesIO) -> Tuple[int, bytes]:
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if not fd: raise Exception()
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tlv_type = _read_field(fd=fd, field_type="varint", count=1)
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tlv_len = _read_field(fd=fd, field_type="varint", count=1)
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tlv_val = _read_field(fd=fd, field_type="byte", count=tlv_len)
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return tlv_type, tlv_val
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def _write_tlv_record(*, fd: io.BytesIO, tlv_type: int, tlv_val: bytes) -> None:
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if not fd: raise Exception()
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tlv_len = len(tlv_val)
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_write_field(fd=fd, field_type="varint", count=1, value=tlv_type)
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_write_field(fd=fd, field_type="varint", count=1, value=tlv_len)
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_write_field(fd=fd, field_type="byte", count=tlv_len, value=tlv_val)
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def _resolve_field_count(field_count_str: str, *, vars_dict: dict, allow_any=False) -> Union[int, str]:
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"""Returns an evaluated field count, typically an int.
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If allow_any is True, the return value can be a str with value=="...".
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"""
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if field_count_str == "":
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field_count = 1
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elif field_count_str == "...":
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if not allow_any:
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raise Exception("field count is '...' but allow_any is False")
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return field_count_str
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else:
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try:
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field_count = int(field_count_str)
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except ValueError:
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field_count = vars_dict[field_count_str]
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if isinstance(field_count, (bytes, bytearray)):
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field_count = int.from_bytes(field_count, byteorder="big")
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assert isinstance(field_count, int)
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return field_count
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def _parse_msgtype_intvalue_for_onion_wire(value: str) -> int:
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msg_type_int = 0
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for component in value.split("|"):
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try:
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msg_type_int |= int(component)
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except ValueError:
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msg_type_int |= OnionFailureCodeMetaFlag[component]
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return msg_type_int
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class LNSerializer:
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def __init__(self, *, for_onion_wire: bool = False):
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# TODO msg_type could be 'int' everywhere...
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self.msg_scheme_from_type = {} # type: Dict[bytes, List[Sequence[str]]]
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self.msg_type_from_name = {} # type: Dict[str, bytes]
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self.in_tlv_stream_get_tlv_record_scheme_from_type = {} # type: Dict[str, Dict[int, List[Sequence[str]]]]
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self.in_tlv_stream_get_record_type_from_name = {} # type: Dict[str, Dict[str, int]]
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self.in_tlv_stream_get_record_name_from_type = {} # type: Dict[str, Dict[int, str]]
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if for_onion_wire:
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path = os.path.join(os.path.dirname(__file__), "lnwire", "onion_wire.csv")
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else:
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path = os.path.join(os.path.dirname(__file__), "lnwire", "peer_wire.csv")
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with open(path, newline='') as f:
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csvreader = csv.reader(f)
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for row in csvreader:
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#print(f">>> {row!r}")
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if row[0] == "msgtype":
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# msgtype,<msgname>,<value>[,<option>]
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msg_type_name = row[1]
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if for_onion_wire:
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msg_type_int = _parse_msgtype_intvalue_for_onion_wire(str(row[2]))
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else:
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msg_type_int = int(row[2])
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msg_type_bytes = msg_type_int.to_bytes(2, 'big')
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assert msg_type_bytes not in self.msg_scheme_from_type, f"type collision? for {msg_type_name}"
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assert msg_type_name not in self.msg_type_from_name, f"type collision? for {msg_type_name}"
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row[2] = msg_type_int
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self.msg_scheme_from_type[msg_type_bytes] = [tuple(row)]
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self.msg_type_from_name[msg_type_name] = msg_type_bytes
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elif row[0] == "msgdata":
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# msgdata,<msgname>,<fieldname>,<typename>,[<count>][,<option>]
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assert msg_type_name == row[1]
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self.msg_scheme_from_type[msg_type_bytes].append(tuple(row))
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elif row[0] == "tlvtype":
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# tlvtype,<tlvstreamname>,<tlvname>,<value>[,<option>]
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tlv_stream_name = row[1]
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tlv_record_name = row[2]
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tlv_record_type = int(row[3])
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row[3] = tlv_record_type
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if tlv_stream_name not in self.in_tlv_stream_get_tlv_record_scheme_from_type:
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self.in_tlv_stream_get_tlv_record_scheme_from_type[tlv_stream_name] = OrderedDict()
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self.in_tlv_stream_get_record_type_from_name[tlv_stream_name] = {}
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self.in_tlv_stream_get_record_name_from_type[tlv_stream_name] = {}
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assert tlv_record_type not in self.in_tlv_stream_get_tlv_record_scheme_from_type[tlv_stream_name], f"type collision? for {tlv_stream_name}/{tlv_record_name}"
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assert tlv_record_name not in self.in_tlv_stream_get_record_type_from_name[tlv_stream_name], f"type collision? for {tlv_stream_name}/{tlv_record_name}"
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assert tlv_record_type not in self.in_tlv_stream_get_record_type_from_name[tlv_stream_name], f"type collision? for {tlv_stream_name}/{tlv_record_name}"
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self.in_tlv_stream_get_tlv_record_scheme_from_type[tlv_stream_name][tlv_record_type] = [tuple(row)]
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self.in_tlv_stream_get_record_type_from_name[tlv_stream_name][tlv_record_name] = tlv_record_type
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self.in_tlv_stream_get_record_name_from_type[tlv_stream_name][tlv_record_type] = tlv_record_name
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if max(self.in_tlv_stream_get_tlv_record_scheme_from_type[tlv_stream_name].keys()) > tlv_record_type:
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raise Exception(f"tlv record types must be listed in monotonically increasing order for stream. "
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f"stream={tlv_stream_name}")
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elif row[0] == "tlvdata":
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# tlvdata,<tlvstreamname>,<tlvname>,<fieldname>,<typename>,[<count>][,<option>]
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assert tlv_stream_name == row[1]
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assert tlv_record_name == row[2]
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self.in_tlv_stream_get_tlv_record_scheme_from_type[tlv_stream_name][tlv_record_type].append(tuple(row))
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else:
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pass # TODO
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def write_tlv_stream(self, *, fd: io.BytesIO, tlv_stream_name: str, **kwargs) -> None:
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scheme_map = self.in_tlv_stream_get_tlv_record_scheme_from_type[tlv_stream_name]
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for tlv_record_type, scheme in scheme_map.items(): # note: tlv_record_type is monotonically increasing
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tlv_record_name = self.in_tlv_stream_get_record_name_from_type[tlv_stream_name][tlv_record_type]
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if tlv_record_name not in kwargs:
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continue
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with io.BytesIO() as tlv_record_fd:
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for row in scheme:
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if row[0] == "tlvtype":
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pass
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elif row[0] == "tlvdata":
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# tlvdata,<tlvstreamname>,<tlvname>,<fieldname>,<typename>,[<count>][,<option>]
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assert tlv_stream_name == row[1]
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assert tlv_record_name == row[2]
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field_name = row[3]
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field_type = row[4]
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field_count_str = row[5]
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field_count = _resolve_field_count(field_count_str,
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vars_dict=kwargs[tlv_record_name],
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allow_any=True)
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field_value = kwargs[tlv_record_name][field_name]
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_write_field(fd=tlv_record_fd,
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field_type=field_type,
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count=field_count,
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value=field_value)
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else:
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raise Exception(f"unexpected row in scheme: {row!r}")
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_write_tlv_record(fd=fd, tlv_type=tlv_record_type, tlv_val=tlv_record_fd.getvalue())
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def read_tlv_stream(self, *, fd: io.BytesIO, tlv_stream_name: str) -> Dict[str, Dict[str, Any]]:
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parsed = {} # type: Dict[str, Dict[str, Any]]
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scheme_map = self.in_tlv_stream_get_tlv_record_scheme_from_type[tlv_stream_name]
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last_seen_tlv_record_type = -1 # type: int
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while _num_remaining_bytes_to_read(fd) > 0:
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tlv_record_type, tlv_record_val = _read_tlv_record(fd=fd)
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if not (tlv_record_type > last_seen_tlv_record_type):
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raise MsgInvalidFieldOrder(f"TLV records must be monotonically increasing by type. "
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f"cur: {tlv_record_type}. prev: {last_seen_tlv_record_type}")
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last_seen_tlv_record_type = tlv_record_type
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try:
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scheme = scheme_map[tlv_record_type]
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except KeyError:
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if tlv_record_type % 2 == 0:
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# unknown "even" type: hard fail
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raise UnknownMandatoryTLVRecordType(f"{tlv_stream_name}/{tlv_record_type}") from None
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else:
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# unknown "odd" type: skip it
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continue
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tlv_record_name = self.in_tlv_stream_get_record_name_from_type[tlv_stream_name][tlv_record_type]
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parsed[tlv_record_name] = {}
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with io.BytesIO(tlv_record_val) as tlv_record_fd:
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for row in scheme:
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#print(f"row: {row!r}")
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if row[0] == "tlvtype":
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pass
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elif row[0] == "tlvdata":
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# tlvdata,<tlvstreamname>,<tlvname>,<fieldname>,<typename>,[<count>][,<option>]
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assert tlv_stream_name == row[1]
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assert tlv_record_name == row[2]
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|
field_name = row[3]
|
|
field_type = row[4]
|
|
field_count_str = row[5]
|
|
field_count = _resolve_field_count(field_count_str,
|
|
vars_dict=parsed[tlv_record_name],
|
|
allow_any=True)
|
|
#print(f">> count={field_count}. parsed={parsed}")
|
|
parsed[tlv_record_name][field_name] = _read_field(fd=tlv_record_fd,
|
|
field_type=field_type,
|
|
count=field_count)
|
|
else:
|
|
raise Exception(f"unexpected row in scheme: {row!r}")
|
|
if _num_remaining_bytes_to_read(tlv_record_fd) > 0:
|
|
raise MsgTrailingGarbage(f"TLV record ({tlv_stream_name}/{tlv_record_name}) has extra trailing garbage")
|
|
return parsed
|
|
|
|
def encode_msg(self, msg_type: str, **kwargs) -> bytes:
|
|
"""
|
|
Encode kwargs into a Lightning message (bytes)
|
|
of the type given in the msg_type string
|
|
"""
|
|
#print(f">>> encode_msg. msg_type={msg_type}, payload={kwargs!r}")
|
|
msg_type_bytes = self.msg_type_from_name[msg_type]
|
|
scheme = self.msg_scheme_from_type[msg_type_bytes]
|
|
with io.BytesIO() as fd:
|
|
fd.write(msg_type_bytes)
|
|
for row in scheme:
|
|
if row[0] == "msgtype":
|
|
pass
|
|
elif row[0] == "msgdata":
|
|
# msgdata,<msgname>,<fieldname>,<typename>,[<count>][,<option>]
|
|
field_name = row[2]
|
|
field_type = row[3]
|
|
field_count_str = row[4]
|
|
#print(f">>> encode_msg. msgdata. field_name={field_name!r}. field_type={field_type!r}. field_count_str={field_count_str!r}")
|
|
field_count = _resolve_field_count(field_count_str, vars_dict=kwargs)
|
|
if field_name == "tlvs":
|
|
tlv_stream_name = field_type
|
|
if tlv_stream_name in kwargs:
|
|
self.write_tlv_stream(fd=fd, tlv_stream_name=tlv_stream_name, **(kwargs[tlv_stream_name]))
|
|
continue
|
|
try:
|
|
field_value = kwargs[field_name]
|
|
except KeyError:
|
|
if len(row) > 5:
|
|
break # optional feature field not present
|
|
else:
|
|
field_value = 0 # default mandatory fields to zero
|
|
#print(f">>> encode_msg. writing field: {field_name}. value={field_value!r}. field_type={field_type!r}. count={field_count!r}")
|
|
_write_field(fd=fd,
|
|
field_type=field_type,
|
|
count=field_count,
|
|
value=field_value)
|
|
#print(f">>> encode_msg. so far: {fd.getvalue().hex()}")
|
|
else:
|
|
raise Exception(f"unexpected row in scheme: {row!r}")
|
|
return fd.getvalue()
|
|
|
|
def decode_msg(self, data: bytes) -> Tuple[str, dict]:
|
|
"""
|
|
Decode Lightning message by reading the first
|
|
two bytes to determine message type.
|
|
|
|
Returns message type string and parsed message contents dict,
|
|
or raises FailedToParseMsg.
|
|
"""
|
|
#print(f"decode_msg >>> {data.hex()}")
|
|
assert len(data) >= 2
|
|
msg_type_bytes = data[:2]
|
|
msg_type_int = int.from_bytes(msg_type_bytes, byteorder="big", signed=False)
|
|
try:
|
|
scheme = self.msg_scheme_from_type[msg_type_bytes]
|
|
except KeyError:
|
|
if msg_type_int % 2 == 0: # even types must be understood: "mandatory"
|
|
raise UnknownMandatoryMsgType(f"msg_type={msg_type_int}")
|
|
else: # odd types are ok not to understand: "optional"
|
|
raise UnknownOptionalMsgType(f"msg_type={msg_type_int}")
|
|
assert scheme[0][2] == msg_type_int
|
|
msg_type_name = scheme[0][1]
|
|
parsed = {}
|
|
with io.BytesIO(data[2:]) as fd:
|
|
for row in scheme:
|
|
#print(f"row: {row!r}")
|
|
if row[0] == "msgtype":
|
|
pass
|
|
elif row[0] == "msgdata":
|
|
field_name = row[2]
|
|
field_type = row[3]
|
|
field_count_str = row[4]
|
|
field_count = _resolve_field_count(field_count_str, vars_dict=parsed)
|
|
if field_name == "tlvs":
|
|
tlv_stream_name = field_type
|
|
d = self.read_tlv_stream(fd=fd, tlv_stream_name=tlv_stream_name)
|
|
parsed[tlv_stream_name] = d
|
|
continue
|
|
#print(f">> count={field_count}. parsed={parsed}")
|
|
try:
|
|
parsed[field_name] = _read_field(fd=fd,
|
|
field_type=field_type,
|
|
count=field_count)
|
|
except UnexpectedEndOfStream as e:
|
|
if len(row) > 5:
|
|
break # optional feature field not present
|
|
else:
|
|
raise
|
|
else:
|
|
raise Exception(f"unexpected row in scheme: {row!r}")
|
|
return msg_type_name, parsed
|
|
|
|
|
|
_inst = LNSerializer()
|
|
encode_msg = _inst.encode_msg
|
|
decode_msg = _inst.decode_msg
|
|
|
|
|
|
OnionWireSerializer = LNSerializer(for_onion_wire=True)
|