58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
from __future__ import annotations
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import hashlib
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import json
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from dataclasses import dataclass
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from datetime import datetime
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from typing import List
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@dataclass
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class GovernanceEntry:
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contract_id: str
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action: str
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signer: str
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timestamp: str
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version: int
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payload_hash: str | None = None
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class GovernanceLedger:
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def __init__(self) -> None:
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self._entries: List[GovernanceEntry] = []
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self._last_hash: str | None = None
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def _hash_entry(self, entry: GovernanceEntry) -> str:
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data = {
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"contract_id": entry.contract_id,
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"action": entry.action,
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"signer": entry.signer,
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"timestamp": entry.timestamp,
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"version": entry.version,
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"payload_hash": entry.payload_hash,
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"prev_hash": self._last_hash,
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}
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return hashlib.sha256(json.dumps(data, sort_keys=True).encode("utf-8")).hexdigest()
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def append(self, contract_id: str, action: str, signer: str, version: int, payload_hash: str | None = None) -> GovernanceEntry:
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entry = GovernanceEntry(
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contract_id=contract_id,
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action=action,
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signer=signer,
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timestamp=datetime.utcnow().isoformat() + "Z",
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version=version,
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payload_hash=payload_hash,
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)
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self._entries.append(entry)
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self._last_hash = self._hash_entry(entry)
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return entry
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def entries(self) -> List[GovernanceEntry]:
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return list(self._entries)
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def latest_hash(self) -> str | None:
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return self._last_hash
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__all__ = ["GovernanceLedger", "GovernanceEntry"]
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