File size: 3,563 Bytes
a8b4b87 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 | """
Receipt chain — local SHA-256 linked receipts used by every chakra evaluation
and every scheduler tick.
Mirrors the shape of `@szl-holdings/szl-receipts` (LambdaReceipt) so receipts
written here can be reasoned about by the same TypeScript consumers without
re-serialisation drift.
"""
from __future__ import annotations
import hashlib
import json
import threading
import time
from dataclasses import dataclass, field
from typing import Any
def canonical_json(value: Any) -> str:
return json.dumps(value, sort_keys=True, separators=(",", ":"), ensure_ascii=False)
def sha256_hex(text: str) -> str:
return hashlib.sha256(text.encode("utf-8")).hexdigest()
def hash_json(value: Any) -> str:
return sha256_hex(canonical_json(value))
GENESIS_PREV_HASH = "0" * 64
@dataclass
class Receipt:
seq: int
ts: str
endpoint: str
method: str
params_hash: str
result_hash: str | None
operator_id: str
prev_hash: str
self_hash: str
metadata: dict[str, Any] = field(default_factory=dict)
def to_dict(self) -> dict[str, Any]:
return {
"seq": self.seq,
"ts": self.ts,
"endpoint": self.endpoint,
"method": self.method,
"paramsHash": self.params_hash,
"resultHash": self.result_hash,
"operatorId": self.operator_id,
"prevHash": self.prev_hash,
"selfHash": self.self_hash,
"metadata": self.metadata,
}
class ReceiptChain:
"""In-memory append-only receipt chain."""
def __init__(self, operator_id: str = "amaru-runtime") -> None:
self._operator_id = operator_id
self._lock = threading.Lock()
self._receipts: list[Receipt] = []
def append(
self,
*,
endpoint: str,
method: str,
params: Any,
result: Any | None = None,
metadata: dict[str, Any] | None = None,
) -> Receipt:
with self._lock:
seq = len(self._receipts) + 1
prev_hash = (
self._receipts[-1].self_hash if self._receipts else GENESIS_PREV_HASH
)
ts = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())
params_hash = hash_json(params)
result_hash = hash_json(result) if result is not None else None
partial = {
"seq": seq,
"ts": ts,
"endpoint": endpoint,
"method": method,
"paramsHash": params_hash,
"resultHash": result_hash,
"operatorId": self._operator_id,
"prevHash": prev_hash,
"metadata": metadata or {},
}
self_hash = hash_json(partial)
receipt = Receipt(
seq=seq,
ts=ts,
endpoint=endpoint,
method=method,
params_hash=params_hash,
result_hash=result_hash,
operator_id=self._operator_id,
prev_hash=prev_hash,
self_hash=self_hash,
metadata=metadata or {},
)
self._receipts.append(receipt)
return receipt
def head(self) -> Receipt | None:
with self._lock:
return self._receipts[-1] if self._receipts else None
def all(self) -> list[Receipt]:
with self._lock:
return list(self._receipts)
def length(self) -> int:
with self._lock:
return len(self._receipts)
|