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+# Copyright 2021 The Matrix.org Foundation C.I.C.
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+#
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+# Licensed under the Apache License, Version 2.0 (the "License");
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+# you may not use this file except in compliance with the License.
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+# You may obtain a copy of the License at
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+#
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+# http://www.apache.org/licenses/LICENSE-2.0
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+#
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+# Unless required by applicable law or agreed to in writing, software
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+# distributed under the License is distributed on an "AS IS" BASIS,
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+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+# See the License for the specific language governing permissions and
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+# limitations under the License.
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+
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+from typing import Optional
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+
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+from synapse.storage._base import SQLBaseStore
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+
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+
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+class RoomBatchStore(SQLBaseStore):
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+ async def get_insertion_event_by_chunk_id(self, chunk_id: str) -> Optional[str]:
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+ """Retrieve a insertion event ID.
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+
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+ Args:
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+ chunk_id: The chunk ID of the insertion event to retrieve.
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+
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+ Returns:
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+ The event_id of an insertion event, or None if there is no known
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+ insertion event for the given insertion event.
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+ """
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+ return await self.db_pool.simple_select_one_onecol(
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+ table="insertion_events",
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+ keyvalues={"next_chunk_id": chunk_id},
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+ retcol="event_id",
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+ allow_none=True,
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+ )
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