verae-mcp-timestamping-server/tests/test_nats_ledger.py
George Lambert 9e3dfb6fb2 feat: hash-only stamp, verify, and hash_report MCP tools
Memory ledger for stdio tests; NatsLedger speaks locald subjects.
2026-09-20 02:59:00 -04:00

64 lines
2.3 KiB
Python

"""NatsLedger speaks locald subjects: verae.ts.request / verify / hash.report."""
import json
import pytest
from verae_mcp_timestamping_server.ledger import SHA256_EMPTY, MemoryLedger, Receipt
from verae_mcp_timestamping_server.nats_ledger import NatsLedger
pytestmark = pytest.mark.anyio
class _Msg:
def __init__(self, data: bytes):
self.data = data
class _FakeNc:
"""Request/reply shaped like nats-py, backed by MemoryLedger (locald protocol)."""
def __init__(self, inner: MemoryLedger):
self.inner = inner
async def request(self, subject: str, payload: bytes, timeout: float = 2.0):
body = json.loads(payload)
if subject == "verae.ts.request":
receipts = await self.inner.stamp(
body["hash"],
scope=body.get("scope") or "local",
cube_id=body.get("cube_id") or "",
org_id=body.get("org_id") or "",
)
return _Msg(receipts[0].model_dump_json().encode())
if subject == "verae.ts.verify":
result = await self.inner.verify(
body["receipt_id"], want_scope=body.get("want_scope") or ""
)
if not result.valid or result.receipt is None:
return _Msg(json.dumps({"valid": False, "error": result.error}).encode())
return _Msg(result.receipt.model_dump_json().encode())
if subject == "verae.hash.report":
receipts = await self.inner.hash_report(
body["hash"], org_id=body.get("org_id") or ""
)
return _Msg(
json.dumps({"receipts": [r.model_dump() for r in receipts]}).encode()
)
raise AssertionError(f"unexpected subject {subject}")
async def test_nats_stamp_verify_report_roundtrip():
nc = _FakeNc(MemoryLedger())
ledger = NatsLedger(nc)
receipts = await ledger.stamp(SHA256_EMPTY, scope="local", cube_id="cube-1")
assert receipts[0].hash == SHA256_EMPTY
assert receipts[0].cube_id == "cube-1"
ok = await ledger.verify(receipts[0].receipt_id, want_scope="local")
assert ok.valid is True
assert ok.receipt is not None
report = await ledger.hash_report(SHA256_EMPTY)
assert [r.receipt_id for r in report] == [receipts[0].receipt_id]
assert isinstance(report[0], Receipt)