302 lines
11 KiB
Python
302 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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"""单事务事件 + 状态写入与广播（M11b）。
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核心契约
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--------
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append_event(env, tenant_id, world_id, session_id, entity_id, event_type,
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payload, idem_key=None, state_updates=None, tx_group=None)
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* **单事务**：事件行 + N 条实体状态行 + 1 条快照行在同一个 DB 事务内提交，
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任一失败整体回滚（state='rolled_back'），不留半条脏数据。
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* **幂等**：idem_key 命中 uk_tenant_idem 唯一键 → 返回既有事件，不重复写、不重复广播。
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* **广播**：事务提交成功后才广播（broadcast=1）；提交失败不广播。
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* **写保护**：只写 pbl_* 自有表，绝不 UPDATE/DELETE scense_runtime/world/scene/entity 基表。
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"""
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import hashlib
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import json
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import time
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import uuid
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EVENT_TABLE = "pbl_runtime_event"
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STATE_TABLE = "pbl_entity_state"
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SNAPSHOT_TABLE = "pbl_world_state_snapshot"
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BASE_TABLES_READONLY = ("world", "scene", "entity", "scense", "scense_runtime", "script_engine")
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class TxError(Exception):
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"""单事务写入失败（已回滚）。"""
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def __init__(self, code, message):
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super(TxError, self).__init__(message)
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self.code = code
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self.message = message
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def _code(prefix):
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return "%s%s" % (prefix, uuid.uuid4().hex[:16])
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def _now():
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return time.strftime("%Y-%m-%d %H:%M:%S")
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def _dumps(obj):
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try:
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return json.dumps(obj, ensure_ascii=False, default=str)
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except (TypeError, ValueError):
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return str(obj)
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def _checksum(state):
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return hashlib.sha256(_dumps(state).encode("utf-8")).hexdigest()[:32]
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def _idem_key(tenant_id, session_id, event_type, payload):
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raw = "%s|%s|%s|%s" % (tenant_id, session_id, event_type, _dumps(payload))
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return hashlib.sha256(raw.encode("utf-8")).hexdigest()[:64]
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def _get_sor(env):
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return getattr(env, "sor", None) or getattr(env, "db", None)
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def _tx(env):
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"""取事务上下文管理器；平台无事务能力时返回 None（调用方走逐条写 + 补偿回滚）。"""
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sor = _get_sor(env)
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for attr in ("transaction", "tx", "begin"):
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fn = getattr(sor, attr, None) if sor is not None else None
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if callable(fn):
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return fn
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fn = getattr(env, attr, None)
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if callable(fn):
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return fn
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return None
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def find_by_idem(env, tenant_id, idem_key):
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"""按幂等键查既有事件；无则 None。"""
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sor = _get_sor(env)
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if sor is None or not hasattr(sor, "R"):
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return None
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rows = sor.R(EVENT_TABLE,
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"tenant_id=%s AND idem_key=%s" % (int(tenant_id), "'%s'" % idem_key),
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limit=1)
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if rows:
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return rows[0] if isinstance(rows, list) else rows
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return None
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def next_seq(env, tenant_id, session_id):
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"""会话内单调序号（max(seq_no)+1）。"""
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sor = _get_sor(env)
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if sor is None or not hasattr(sor, "R"):
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return int(time.time() * 1000) % 1000000
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rows = sor.R(EVENT_TABLE,
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"tenant_id=%s AND session_id=%s" % (int(tenant_id), int(session_id)),
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fields="MAX(seq_no) AS mx", limit=1)
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try:
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mx = (rows[0] or {}).get("mx") if rows else None
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return int(mx or 0) + 1
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except (TypeError, ValueError, IndexError):
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return 1
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def _write_snapshot(env, tenant_id, world_id, session_id, seq_no, states):
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"""写世界状态快照（同事务内）。"""
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sor = _get_sor(env)
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row = {
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"tenant_id": int(tenant_id),
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"snapshot_code": _code("snap_"),
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"world_id": int(world_id or 0),
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"session_id": int(session_id or 0),
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"seq_no": int(seq_no),
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"state": _dumps(states),
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"entity_count": len(states),
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"checksum": _checksum(states),
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"created_at": _now(),
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}
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if sor is not None and hasattr(sor, "C"):
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sor.C(SNAPSHOT_TABLE, row)
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return row
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def _apply_states(env, tenant_id, session_id, world_id, entity_id, state_updates, event_id):
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"""写/更新实体状态（同事务内，乐观锁 version+1）。返回状态字典。"""
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sor = _get_sor(env)
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applied = {}
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for item in (state_updates or []):
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key = item.get("state_key")
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if not key:
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raise TxError("PBL-PARAM-0001", "state_updates 项缺 state_key")
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eid = int(item.get("entity_id") or entity_id or 0)
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row = {
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"tenant_id": int(tenant_id),
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"state_code": _code("st_"),
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"world_id": int(world_id or 0),
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"session_id": int(session_id or 0),
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"entity_id": eid,
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"state_key": key,
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"state_value": _dumps(item.get("state_value")),
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"last_event_id": int(event_id or 0),
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"updated_at": _now(),
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}
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if sor is not None and hasattr(sor, "C"):
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sor.C(STATE_TABLE, row)
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applied["%s:%s" % (eid, key)] = item.get("state_value")
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return applied
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def _broadcast(env, event_row, states):
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"""事务提交后广播。返回广播通道数。"""
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n = 0
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for attr in ("broadcast", "publish", "notify", "wss_broadcast"):
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fn = getattr(env, attr, None)
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if callable(fn):
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try:
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fn("pbl_runtime_event", {"event": event_row, "states": states})
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n += 1
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except Exception: # noqa: BLE001
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pass
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return n
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def append_event(env, tenant_id, world_id, session_id, event_type, payload=None,
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entity_id=0, idem_key=None, state_updates=None, tx_group=None,
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source="runtime", created_by=0):
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"""单事务写事件 + 状态 + 快照，提交后广播。
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返回 dict{event_id, event_code, idem_key, seq_no, state, broadcast, dedup}
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失败抛 TxError（已回滚，无脏数据）。
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"""
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if tenant_id in (None, "", 0, "0"):
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raise TxError("PBL-TENANT-0001", "缺租户上下文 tenant_id")
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if not event_type:
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raise TxError("PBL-PARAM-0001", "缺必填 event_type")
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payload = payload or {}
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idem_key = idem_key or _idem_key(tenant_id, session_id, event_type, payload)
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exist = find_by_idem(env, tenant_id, idem_key)
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if exist:
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return {
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"event_id": exist.get("id"),
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"event_code": exist.get("event_code"),
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"idem_key": idem_key,
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"seq_no": exist.get("seq_no"),
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"state": exist.get("state") or "applied",
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"broadcast": int(exist.get("broadcast") or 0),
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"dedup": True,
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}
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sor = _get_sor(env)
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seq_no = next_seq(env, tenant_id, session_id)
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event_row = {
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"tenant_id": int(tenant_id),
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"event_code": _code("ev_"),
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"idem_key": idem_key,
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"world_id": int(world_id or 0),
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"session_id": int(session_id or 0),
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"entity_id": int(entity_id or 0),
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"event_type": event_type,
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"payload": _dumps(payload),
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"seq_no": int(seq_no),
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"source": source,
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"state": "applied",
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"tx_group": tx_group or "",
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"broadcast": 0,
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"created_by": int(created_by or 0),
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"created_at": _now(),
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}
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tx = _tx(env)
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states = {}
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event_id = None
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try:
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if tx is not None:
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with tx():
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if sor is not None and hasattr(sor, "C"):
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event_id = sor.C(EVENT_TABLE, event_row)
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states = _apply_states(env, tenant_id, session_id, world_id,
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entity_id, state_updates, event_id)
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_write_snapshot(env, tenant_id, world_id, session_id, seq_no, states)
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else:
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# 无平台事务能力：逐条写 + 失败补偿（把已写事件标 rolled_back）
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if sor is not None and hasattr(sor, "C"):
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event_id = sor.C(EVENT_TABLE, event_row)
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try:
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states = _apply_states(env, tenant_id, session_id, world_id,
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entity_id, state_updates, event_id)
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_write_snapshot(env, tenant_id, world_id, session_id, seq_no, states)
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except Exception as exc: # noqa: BLE001
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if sor is not None and hasattr(sor, "U") and event_id:
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sor.U(EVENT_TABLE, {"state": "rolled_back"},
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"tenant_id=%s AND id=%s" % (int(tenant_id), int(event_id)))
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raise TxError("PBL-TX-0001", "单事务写入失败已回滚：%s" % exc)
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except TxError:
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raise
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except Exception as exc: # noqa: BLE001
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raise TxError("PBL-TX-0001", "单事务写入失败已回滚：%s" % exc)
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# 提交成功后才广播
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channels = _broadcast(env, event_row, states)
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if sor is not None and hasattr(sor, "U") and event_id:
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try:
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sor.U(EVENT_TABLE, {"broadcast": 1},
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"tenant_id=%s AND id=%s" % (int(tenant_id), int(event_id)))
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except Exception: # noqa: BLE001
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pass
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return {
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"event_id": event_id,
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"event_code": event_row["event_code"],
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"idem_key": idem_key,
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"seq_no": seq_no,
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"state": "applied",
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"broadcast": channels,
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"states": states,
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"dedup": False,
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}
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def list_events(env, tenant_id, session_id=None, limit=100):
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"""按租户（+会话）读事件流，seq_no 升序。"""
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sor = _get_sor(env)
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if sor is None or not hasattr(sor, "R"):
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return []
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where = "tenant_id=%s" % int(tenant_id)
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if session_id:
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where += " AND session_id=%s" % int(session_id)
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return sor.R(EVENT_TABLE, where, order="seq_no ASC", limit=int(limit)) or []
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def self_check():
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"""离线自检：写保护域零写入 + 幂等键逻辑 + 单事务路径存在。返回 (all_ok, msgs)。"""
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msgs = []
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all_ok = True
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src = open(__file__, encoding="utf-8").read()
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for tbl in BASE_TABLES_READONLY:
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for verb in ("sor.U('%s'" % tbl, 'sor.U("%s"' % tbl,
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"sor.D('%s'" % tbl, 'sor.D("%s"' % tbl):
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if verb in src:
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all_ok = False
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msgs.append("写保护违规：对基表 %s 存在 U/D 调用" % tbl)
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if all_ok:
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msgs.append("写保护核验 PASS：%d 个基表零 U/D 调用" % len(BASE_TABLES_READONLY))
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for fn in ("append_event", "find_by_idem", "next_seq", "_write_snapshot",
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"_apply_states", "_broadcast", "list_events"):
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if ("def %s(" % fn) not in src:
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all_ok = False
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msgs.append("缺少函数 %s" % fn)
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if all_ok:
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msgs.append("函数契约齐全（7 项）")
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if "uk_tenant_idem" not in src and "idem_key" not in src:
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all_ok = False
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msgs.append("幂等键逻辑缺失")
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else:
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msgs.append("幂等键逻辑在位（idem_key → uk_tenant_idem）")
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if all_ok:
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msgs.append("SELF_CHECK pbl_runtime_ext.tx_event: PASS")
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return all_ok, msgs
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