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Rewrite encoding in dataclass #97

Description

@zjkmxy

Homemade classes for TLV data structures are not compatible with Python's internal data structures. Now we can move to Python 3.11, so let's use dataclass.

Example

OLD:

class SignatureInfo(TlvModel):
    signature_type = UintField(0x1b, fixed_len=1)
    key_locator = ModelField(0x1c, KeyLocator)
    signature_nonce = UintField(0x26)
    signature_time = UintField(0x28)
    signature_seq_num = UintField(0x2a)


SignatureInfo().encode()
SignatureInfo.parse(wire)

NEW:

from dataclasses import dataclass, field
from ndn.encoding import tlv_encode, tlv_parse


@dataclass
class SignatureInfo:
    signature_type: int = field(metadata = {'tlv_type': 0x1b, 'fixed_len': 1})
    key_locator: KeyLocator = field(metadata = {'tlv_type': 0x1c})
    signature_nonce: int = field(metadata = {'tlv_type': 0x26})
    signature_time: int = field(metadata = {'tlv_type': 0x28})
    signature_seq_num: int = field(metadata = {'tlv_type': 0x2a})


tlv_encode(SignatureInfo())
tlv_parse(SignatureInfo, wire)

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