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39 lines
1 KiB
Python
39 lines
1 KiB
Python
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"""The ``Event`` value object — the only shape that crosses the bus.
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An immutable fact: something named happened, with this payload, in this space,
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at this time. JSON round-trippable so a subscriber can queue it to a worker.
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"""
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from __future__ import annotations
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import uuid
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from datetime import UTC, datetime
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from typing import Any
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from pydantic import BaseModel, ConfigDict, Field
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def _new_event_id() -> str:
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return uuid.uuid4().hex
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def _now() -> datetime:
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return datetime.now(UTC)
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class Event(BaseModel):
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"""A published domain fact.
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``event_type`` is a dotted namespace (``document.indexed``, etc). ``payload`` is
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JSON-serializable. ``search_space_id`` scopes delivery. ``event_id`` and
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``occurred_at`` are engine-stamped.
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"""
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model_config = ConfigDict(frozen=True)
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event_type: str
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payload: dict[str, Any] = Field(default_factory=dict)
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search_space_id: int
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event_id: str = Field(default_factory=_new_event_id)
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occurred_at: datetime = Field(default_factory=_now)
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