Import AITURK IDE 1.0.0-beta.1 from Hermes 63279301; preserve MIT license
This commit is contained in:
@@ -0,0 +1,570 @@
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"""Replica store and takeover primitives for hosted Group Chat rooms.
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The authority gateway owns a room's ordered log in ``gateway/hosted_rooms.py``.
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This module gives every OTHER participant gateway a durable local copy of that
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log, and the fenced primitives to continue the room when the authority host
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dies:
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- ``ingest_page()`` persists replay pages (``groups.log`` output, which carries
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the room's authority stamp) idempotently, refusing sequence gaps and
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authority-epoch regressions.
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- ``promote_replica()`` instantiates the replicated log as a locally-owned
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hosted room at ``epoch + 1`` with a lineage-proving ``authority.claimed``
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event, so a surviving participant can resume the room.
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- ``demote_room()`` fences a returning stale authority: presented with proof of
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a newer epoch, the local room records ``authority.lost`` and stops being
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authoritative.
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Storage primitives only: none of these decide *when* takeover is safe. The
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caller (an explicit user action today; a lease/quorum driver later) must
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establish that the previous owner can no longer commit before promoting.
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"""
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from __future__ import annotations
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import json
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import sqlite3
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import time
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from pathlib import Path
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from typing import Any
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from gateway.hosted_rooms import (
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MAX_ACTOR_ID_CHARS,
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MAX_EVENT_JSON_BYTES,
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MAX_ROOM_ID_CHARS,
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HostedRoomError,
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RoomConflictError,
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_canonical_json,
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_connect,
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_transaction,
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_validate_identifier,
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_validate_members,
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_validate_room_name,
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local_authority_gateway_id,
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)
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MAX_REPLICA_ROOMS = 256
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MAX_REPLICA_EVENT_BYTES = 256 * 1024 * 1024
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class ReplicaError(HostedRoomError):
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"""Base class for invalid or conflicting replica operations."""
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class ReplicaGapError(ReplicaError):
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"""A page does not start at the replica's next expected sequence."""
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class ReplicaEpochRegressionError(ReplicaError):
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"""A page or demotion carries an older authority epoch than stored."""
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def _initialize_replica_schema(conn: sqlite3.Connection) -> None:
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conn.execute(
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"""CREATE TABLE IF NOT EXISTS hosted_room_replicas (
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room_id TEXT PRIMARY KEY,
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name TEXT NOT NULL,
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members_json TEXT NOT NULL,
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authority_gateway_id TEXT NOT NULL,
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authority_epoch INTEGER NOT NULL CHECK (authority_epoch >= 1),
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last_seq INTEGER NOT NULL DEFAULT 0 CHECK (last_seq >= 0),
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latest_seq INTEGER NOT NULL DEFAULT 0,
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event_bytes INTEGER NOT NULL DEFAULT 0,
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created_at REAL NOT NULL,
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updated_at REAL NOT NULL
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)"""
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)
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conn.execute(
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"""CREATE TABLE IF NOT EXISTS hosted_room_replica_events (
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room_id TEXT NOT NULL,
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seq INTEGER NOT NULL CHECK (seq >= 1),
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event_id TEXT NOT NULL,
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kind TEXT NOT NULL,
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actor_json TEXT NOT NULL,
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authority_epoch INTEGER,
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payload_json TEXT NOT NULL,
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created_at REAL NOT NULL,
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PRIMARY KEY (room_id, seq)
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)"""
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)
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def _replica_transaction(db_path: Path | str):
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return _transaction(db_path, immediate=True)
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def _ensure_schema(db_path: Path | str) -> None:
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conn = _connect(db_path)
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try:
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with conn:
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_initialize_replica_schema(conn)
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finally:
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conn.close()
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def _event_bytes(event: dict[str, Any]) -> int:
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return (
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len(str(event["event_id"]).encode("utf-8"))
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+ len(str(event["kind"]).encode("utf-8"))
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+ len(
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json.dumps(
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event["actor"], ensure_ascii=False, separators=(",", ":")
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).encode("utf-8")
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)
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+ len(
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json.dumps(
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event["payload"], ensure_ascii=False, separators=(",", ":")
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).encode("utf-8")
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)
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)
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def _validate_page(page: Any) -> tuple[list[dict[str, Any]], dict[str, Any]]:
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if not isinstance(page, dict):
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raise ReplicaError("page must be an object")
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events = page.get("events")
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authority = page.get("authority")
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if not isinstance(events, list):
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raise ReplicaError("page.events must be a list")
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if not isinstance(authority, dict):
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raise ReplicaError("page.authority is required for replication")
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gateway_id = _validate_identifier(
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authority.get("gateway_id"),
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label="page.authority.gateway_id",
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max_chars=MAX_ACTOR_ID_CHARS,
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)
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epoch = authority.get("epoch")
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if isinstance(epoch, bool) or not isinstance(epoch, int) or epoch < 1:
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raise ReplicaError("page.authority.epoch must be a positive integer")
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previous_seq: int | None = None
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for event in events:
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if not isinstance(event, dict):
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raise ReplicaError("page events must be objects")
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seq = event.get("seq")
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if isinstance(seq, bool) or not isinstance(seq, int) or seq < 1:
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raise ReplicaError("event.seq must be a positive integer")
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if previous_seq is not None and seq != previous_seq + 1:
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raise ReplicaGapError("page events must be contiguous")
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previous_seq = seq
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for field in ("event_id", "kind"):
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if not isinstance(event.get(field), str) or not event[field]:
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raise ReplicaError(f"event.{field} must be a non-empty string")
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if not isinstance(event.get("actor"), dict):
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raise ReplicaError("event.actor must be an object")
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if "payload" not in event:
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raise ReplicaError("event.payload is required")
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return events, {"gateway_id": gateway_id, "epoch": epoch}
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def ingest_page(
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db_path: Path | str,
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*,
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room_id: Any,
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room_name: Any,
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members: Any,
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page: Any,
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now: float | None = None,
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) -> dict[str, Any]:
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"""Persist one replay page for ``room_id``; idempotent, gap- and
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epoch-regression-safe.
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``page`` is the verbatim result of the authority's ``groups.log`` call
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(``read_events()``), whose ``authority`` stamp proves lineage.
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"""
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room_id = _validate_identifier(
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room_id, label="room_id", max_chars=MAX_ROOM_ID_CHARS
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)
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room_name = _validate_room_name(room_name)
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_, members_json = _validate_members(members)
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events, authority = _validate_page(page)
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now = time.time() if now is None else float(now)
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_ensure_schema(db_path)
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with _replica_transaction(db_path) as conn:
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_initialize_replica_schema(conn)
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row = conn.execute(
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"""SELECT authority_gateway_id, authority_epoch, last_seq,
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latest_seq, event_bytes
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FROM hosted_room_replicas WHERE room_id=?""",
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(room_id,),
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).fetchone()
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if row is None:
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count = conn.execute(
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"SELECT COUNT(*) FROM hosted_room_replicas"
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).fetchone()[0]
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if int(count) >= MAX_REPLICA_ROOMS:
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raise ReplicaError("replica room capacity exhausted")
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stored_epoch = 0
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last_seq = 0
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stored_bytes = 0
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else:
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stored_epoch = int(row["authority_epoch"])
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last_seq = int(row["last_seq"])
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stored_bytes = int(row["event_bytes"])
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if authority["epoch"] < stored_epoch:
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raise ReplicaEpochRegressionError(
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"page authority epoch is older than the stored replica epoch"
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)
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new_events = [e for e in events if int(e["seq"]) > last_seq]
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if new_events and int(new_events[0]["seq"]) != last_seq + 1:
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raise ReplicaGapError(
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"page skips sequences the replica has not stored"
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)
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added_bytes = 0
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for event in new_events:
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size = _event_bytes(event)
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if stored_bytes + added_bytes + size > MAX_REPLICA_EVENT_BYTES:
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raise ReplicaError("replica event storage exhausted")
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actor_json = _canonical_json(
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event["actor"], label="actor", max_bytes=4 * 1024
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)
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payload_json = _canonical_json(
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event["payload"], label="payload", max_bytes=MAX_EVENT_JSON_BYTES
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)
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epoch_value = event.get("authority_epoch")
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conn.execute(
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"""INSERT INTO hosted_room_replica_events
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(room_id, seq, event_id, kind, actor_json, authority_epoch,
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payload_json, created_at)
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VALUES (?, ?, ?, ?, ?, ?, ?, ?)""",
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(
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room_id,
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int(event["seq"]),
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event["event_id"],
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event["kind"],
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actor_json,
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epoch_value,
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payload_json,
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float(event.get("created_at") or now),
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),
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)
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added_bytes += size
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new_last = int(new_events[-1]["seq"]) if new_events else last_seq
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latest_seq = page.get("latest_seq")
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if isinstance(latest_seq, bool) or not isinstance(latest_seq, int):
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latest_seq = new_last
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if row is None:
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conn.execute(
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"""INSERT INTO hosted_room_replicas
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(room_id, name, members_json, authority_gateway_id,
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authority_epoch, last_seq, latest_seq, event_bytes,
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created_at, updated_at)
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VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
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(
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room_id,
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room_name,
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members_json,
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authority["gateway_id"],
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authority["epoch"],
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new_last,
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max(latest_seq, new_last),
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added_bytes,
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now,
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now,
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),
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)
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else:
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conn.execute(
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"""UPDATE hosted_room_replicas
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SET name=?, members_json=?, authority_gateway_id=?,
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authority_epoch=?, last_seq=?, latest_seq=?,
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event_bytes=event_bytes+?, updated_at=?
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WHERE room_id=?""",
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(
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room_name,
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members_json,
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authority["gateway_id"],
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authority["epoch"],
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new_last,
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max(latest_seq, new_last),
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added_bytes,
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now,
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room_id,
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),
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)
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return {
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"room_id": room_id,
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"stored_seq": new_last,
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"ingested": len(new_events),
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"authority": authority,
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"caught_up": new_last >= max(latest_seq, new_last),
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}
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def replica_state(db_path: Path | str, *, room_id: Any) -> dict[str, Any]:
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"""Return the stored replica's coverage and authority lineage."""
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room_id = _validate_identifier(
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room_id, label="room_id", max_chars=MAX_ROOM_ID_CHARS
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)
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_ensure_schema(db_path)
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with _replica_transaction(db_path) as conn:
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_initialize_replica_schema(conn)
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row = conn.execute(
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"""SELECT room_id, name, members_json, authority_gateway_id,
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authority_epoch, last_seq, latest_seq, event_bytes,
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created_at, updated_at
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FROM hosted_room_replicas WHERE room_id=?""",
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(room_id,),
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).fetchone()
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if row is None:
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raise ReplicaError("replica not found")
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return {
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"room_id": row["room_id"],
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"name": row["name"],
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"members": json.loads(row["members_json"]),
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"authority": {
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"gateway_id": row["authority_gateway_id"],
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"epoch": int(row["authority_epoch"]),
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},
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"last_seq": int(row["last_seq"]),
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"latest_seq": int(row["latest_seq"]),
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"event_bytes": int(row["event_bytes"]),
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"created_at": float(row["created_at"]),
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"updated_at": float(row["updated_at"]),
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}
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def promote_replica(
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db_path: Path | str,
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*,
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room_id: Any,
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reason: Any = "authority-unreachable",
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now: float | None = None,
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) -> dict[str, Any]:
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"""Continue a replicated room on THIS gateway at ``epoch + 1``.
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Copies the replica's log into the authoritative store, appends a lineage-
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proving ``authority.claimed`` event, and returns the new room state. The
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old authority is fenced everywhere the claim replicates: its epoch is now
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stale and every fenced primitive rejects it.
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The caller decides that takeover is safe (the previous owner can no longer
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commit). This primitive only makes the takeover atomic and provable.
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"""
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room_id = _validate_identifier(
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room_id, label="room_id", max_chars=MAX_ROOM_ID_CHARS
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)
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if not isinstance(reason, str) or not reason or len(reason) > 200:
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raise ReplicaError("reason must be a non-empty string of at most 200 chars")
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now = time.time() if now is None else float(now)
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local_gateway = local_authority_gateway_id()
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_ensure_schema(db_path)
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with _replica_transaction(db_path) as conn:
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_initialize_replica_schema(conn)
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replica = conn.execute(
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"""SELECT room_id, name, members_json, authority_gateway_id,
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authority_epoch, last_seq, event_bytes
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FROM hosted_room_replicas WHERE room_id=?""",
|
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(room_id,),
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||||
).fetchone()
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if replica is None:
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raise ReplicaError("replica not found")
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if replica["authority_gateway_id"] == local_gateway:
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raise ReplicaError("this gateway already holds the room authority")
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if conn.execute(
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"SELECT 1 FROM hosted_rooms WHERE room_id=?", (room_id,)
|
||||
).fetchone():
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raise RoomConflictError(
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"room_id already exists in the local authoritative store"
|
||||
)
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if conn.execute(
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"SELECT 1 FROM hosted_room_retired_ids WHERE room_id=?",
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(room_id,),
|
||||
).fetchone():
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raise RoomConflictError("room_id belongs to a disbanded room")
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previous_gateway = str(replica["authority_gateway_id"])
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previous_epoch = int(replica["authority_epoch"])
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target_epoch = previous_epoch + 1
|
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last_seq = int(replica["last_seq"])
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claim_seq = last_seq + 1
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claim_event_id = f"system:authority-claimed:{target_epoch}"
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||||
claim_actor_json = _canonical_json(
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{"kind": "system", "id": "authority-control"},
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label="actor",
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||||
max_bytes=4 * 1024,
|
||||
)
|
||||
claim_payload_json = _canonical_json(
|
||||
{
|
||||
"previous_gateway_id": previous_gateway,
|
||||
"authority_gateway_id": local_gateway,
|
||||
"authority_epoch": target_epoch,
|
||||
"promoted_from_replica": True,
|
||||
"reason": reason,
|
||||
},
|
||||
label="payload",
|
||||
max_bytes=MAX_EVENT_JSON_BYTES,
|
||||
)
|
||||
claim_bytes = (
|
||||
len(claim_event_id.encode("utf-8"))
|
||||
+ len(b"authority.claimed")
|
||||
+ len(claim_actor_json.encode("utf-8"))
|
||||
+ len(claim_payload_json.encode("utf-8"))
|
||||
)
|
||||
|
||||
conn.execute(
|
||||
"""INSERT INTO hosted_rooms
|
||||
(room_id, name, members_json, authority_gateway_id,
|
||||
authority_epoch, next_seq, event_bytes, revision,
|
||||
created_at, updated_at, disbanded_at)
|
||||
VALUES (?, ?, ?, ?, ?, ?, ?, 1, ?, ?, NULL)""",
|
||||
(
|
||||
room_id,
|
||||
replica["name"],
|
||||
replica["members_json"],
|
||||
local_gateway,
|
||||
target_epoch,
|
||||
claim_seq + 1,
|
||||
int(replica["event_bytes"]) + claim_bytes,
|
||||
now,
|
||||
now,
|
||||
),
|
||||
)
|
||||
conn.execute(
|
||||
"""INSERT INTO hosted_room_events
|
||||
(room_id, seq, event_id, kind, actor_json, authority_epoch,
|
||||
payload_json, created_at)
|
||||
SELECT room_id, seq, event_id, kind, actor_json,
|
||||
authority_epoch, payload_json, created_at
|
||||
FROM hosted_room_replica_events WHERE room_id=?""",
|
||||
(room_id,),
|
||||
)
|
||||
conn.execute(
|
||||
"""INSERT INTO hosted_room_events
|
||||
(room_id, seq, event_id, kind, actor_json, authority_epoch,
|
||||
payload_json, created_at)
|
||||
VALUES (?, ?, ?, 'authority.claimed', ?, ?, ?, ?)""",
|
||||
(
|
||||
room_id,
|
||||
claim_seq,
|
||||
claim_event_id,
|
||||
claim_actor_json,
|
||||
target_epoch,
|
||||
claim_payload_json,
|
||||
now,
|
||||
),
|
||||
)
|
||||
conn.execute(
|
||||
"DELETE FROM hosted_room_replica_events WHERE room_id=?", (room_id,)
|
||||
)
|
||||
conn.execute(
|
||||
"DELETE FROM hosted_room_replicas WHERE room_id=?", (room_id,)
|
||||
)
|
||||
return {
|
||||
"room_id": room_id,
|
||||
"authority_gateway_id": local_gateway,
|
||||
"authority_epoch": target_epoch,
|
||||
"previous_gateway_id": previous_gateway,
|
||||
"previous_epoch": previous_epoch,
|
||||
"claim_seq": claim_seq,
|
||||
"latest_seq": claim_seq,
|
||||
}
|
||||
|
||||
|
||||
def demote_room(
|
||||
db_path: Path | str,
|
||||
*,
|
||||
room_id: Any,
|
||||
observed_gateway_id: Any,
|
||||
observed_epoch: Any,
|
||||
now: float | None = None,
|
||||
) -> dict[str, Any]:
|
||||
"""Fence THIS gateway's stale room authority against a proven newer epoch.
|
||||
|
||||
Called when a returning gateway observes (via a replicated
|
||||
``authority.claimed`` event or a transport rejection) that another gateway
|
||||
now owns the room at a higher epoch. Appends ``authority.lost`` and adopts
|
||||
the observed lineage so no further local sends can be committed at the
|
||||
stale epoch. Idempotent for repeated observations of the same lineage.
|
||||
"""
|
||||
room_id = _validate_identifier(
|
||||
room_id, label="room_id", max_chars=MAX_ROOM_ID_CHARS
|
||||
)
|
||||
observed_gateway_id = _validate_identifier(
|
||||
observed_gateway_id,
|
||||
label="observed_gateway_id",
|
||||
max_chars=MAX_ACTOR_ID_CHARS,
|
||||
)
|
||||
if (
|
||||
isinstance(observed_epoch, bool)
|
||||
or not isinstance(observed_epoch, int)
|
||||
or observed_epoch < 1
|
||||
):
|
||||
raise ReplicaError("observed_epoch must be a positive integer")
|
||||
now = time.time() if now is None else float(now)
|
||||
local_gateway = local_authority_gateway_id()
|
||||
|
||||
with _replica_transaction(db_path) as conn:
|
||||
row = conn.execute(
|
||||
"""SELECT authority_gateway_id, authority_epoch, next_seq
|
||||
FROM hosted_rooms WHERE room_id=? AND disbanded_at IS NULL""",
|
||||
(room_id,),
|
||||
).fetchone()
|
||||
if row is None:
|
||||
raise ReplicaError("room not found in the local authoritative store")
|
||||
current_gateway = str(row["authority_gateway_id"])
|
||||
current_epoch = int(row["authority_epoch"])
|
||||
if (
|
||||
current_gateway == observed_gateway_id
|
||||
and current_epoch == observed_epoch
|
||||
):
|
||||
return {
|
||||
"room_id": room_id,
|
||||
"authority_gateway_id": current_gateway,
|
||||
"authority_epoch": current_epoch,
|
||||
"idempotent": True,
|
||||
}
|
||||
if observed_epoch <= current_epoch:
|
||||
raise ReplicaEpochRegressionError(
|
||||
"observed epoch does not supersede the stored authority"
|
||||
)
|
||||
if current_gateway != local_gateway:
|
||||
raise ReplicaError(
|
||||
"room is not locally authoritative; nothing to demote"
|
||||
)
|
||||
seq = int(row["next_seq"])
|
||||
lost_actor_json = _canonical_json(
|
||||
{"kind": "system", "id": "authority-control"},
|
||||
label="actor",
|
||||
max_bytes=4 * 1024,
|
||||
)
|
||||
lost_payload_json = _canonical_json(
|
||||
{
|
||||
"previous_gateway_id": current_gateway,
|
||||
"authority_gateway_id": observed_gateway_id,
|
||||
"authority_epoch": observed_epoch,
|
||||
},
|
||||
label="payload",
|
||||
max_bytes=MAX_EVENT_JSON_BYTES,
|
||||
)
|
||||
conn.execute(
|
||||
"""INSERT INTO hosted_room_events
|
||||
(room_id, seq, event_id, kind, actor_json, authority_epoch,
|
||||
payload_json, created_at)
|
||||
VALUES (?, ?, ?, 'authority.lost', ?, ?, ?, ?)""",
|
||||
(
|
||||
room_id,
|
||||
seq,
|
||||
f"system:authority-lost:{observed_epoch}",
|
||||
lost_actor_json,
|
||||
observed_epoch,
|
||||
lost_payload_json,
|
||||
now,
|
||||
),
|
||||
)
|
||||
conn.execute(
|
||||
"""UPDATE hosted_rooms
|
||||
SET authority_gateway_id=?, authority_epoch=?,
|
||||
next_seq=next_seq+1, revision=revision+1, updated_at=?
|
||||
WHERE room_id=?""",
|
||||
(observed_gateway_id, observed_epoch, now, room_id),
|
||||
)
|
||||
return {
|
||||
"room_id": room_id,
|
||||
"authority_gateway_id": observed_gateway_id,
|
||||
"authority_epoch": observed_epoch,
|
||||
"idempotent": False,
|
||||
}
|
||||
Reference in New Issue
Block a user