629bc16382
DeltaStore.frontier returned the live internal set. A delta built with
parents=store.frontier aliased it, so insert's frontier maintenance
(add + difference_update) emptied the frontier on every insert and
rewrote every stored delta's parents to {} — the CRDT causal chain
degenerated into all-roots. Sopher's bridge now copies on its side
(sopher ADR-0026.1 §2.1); this is the recommended CORE-side defense in
depth: frontier hands out snapshots, and insert copies delta.parents
into the event envelope.
Regression-tested with the exact aliasing pattern (3-delta chain keeps
one head and stable per-delta parents).
86 lines
3.3 KiB
Python
86 lines
3.3 KiB
Python
"""Delta Store and CRDT Event definition for GeometricDeltas.
|
|
|
|
Integrates Sopher-emitted GeometricDeltas into CORE's event-centric
|
|
reconstructive Vault/CRDT pipeline.
|
|
"""
|
|
|
|
from dataclasses import dataclass
|
|
from typing import Dict, Set, Optional
|
|
|
|
from core.abi import GeometricDelta, validate_geometric_delta
|
|
|
|
@dataclass(frozen=True)
|
|
class DeltaCRDTEvent:
|
|
"""CRDT envelope wrapping a GeometricDelta for distributed causal sync."""
|
|
id: str # event hash, matches delta.id
|
|
parents: Set[str] # causal parents, matches delta.parents
|
|
delta: GeometricDelta # payload
|
|
author: str # agent/compiler signature or identifier
|
|
signature: Optional[str] = None # optional cryptographic signature
|
|
|
|
class DeltaStore:
|
|
"""In-memory stub representing the Vault's Delta storage engine.
|
|
|
|
In full implementation, this hooks into CORE's persistent SQLite/LMDB vault
|
|
and handles actual graph reconstruction.
|
|
"""
|
|
def __init__(self):
|
|
self._events: Dict[str, DeltaCRDTEvent] = {}
|
|
# Tracks the current frontier (events with no children)
|
|
self._frontier: Set[str] = set()
|
|
|
|
def insert(self, delta: GeometricDelta, author: str = "unknown") -> bool:
|
|
"""Validates and inserts a GeometricDelta into the store.
|
|
|
|
Args:
|
|
delta: The GeometricDelta to insert.
|
|
author: The identifier of the compiler/agent proposing it.
|
|
|
|
Returns:
|
|
True if inserted successfully, False if rejected by validation.
|
|
"""
|
|
# Validate the delta against the CORE ABI contracts
|
|
is_valid, reason = validate_geometric_delta(delta)
|
|
if not is_valid:
|
|
# Under reject-and-retain, we preserve state and log the failure.
|
|
# Real implementation logs to Meta-RH and telemetry sinks.
|
|
print(f"[REJECT-AND-RETAIN] Delta {delta.id} rejected: {reason}")
|
|
return False
|
|
|
|
# Create the CRDT event envelope. Copy parents: the caller may have
|
|
# built the delta from a live frontier set, and the frontier update
|
|
# below must never write through into the delta's causal links
|
|
# (ADR-0026.1 §2.1).
|
|
event = DeltaCRDTEvent(
|
|
id=delta.id,
|
|
parents=set(delta.parents),
|
|
delta=delta,
|
|
author=author
|
|
)
|
|
|
|
# Store the event
|
|
self._events[event.id] = event
|
|
|
|
# Update frontier: add new event, remove its parents from frontier
|
|
self._frontier.add(event.id)
|
|
self._frontier.difference_update(event.parents)
|
|
|
|
return True
|
|
|
|
def insert_delta(self, delta: GeometricDelta, author: str = "unknown") -> bool:
|
|
"""Alias for insert to maintain compatibility."""
|
|
return self.insert(delta, author)
|
|
|
|
def get_event(self, event_id: str) -> Optional[DeltaCRDTEvent]:
|
|
"""Retrieve an event by ID."""
|
|
return self._events.get(event_id)
|
|
|
|
@property
|
|
def frontier(self) -> Set[str]:
|
|
"""Get a snapshot of the current causal frontier.
|
|
|
|
Returns a copy: handing out the live set would let ``insert``'s own
|
|
frontier maintenance mutate any delta built from it, emptying the
|
|
frontier and severing every stored delta's parents (ADR-0026.1 §2.1).
|
|
"""
|
|
return set(self._frontier)
|