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Fix could not serialize access errors for claim_e2e_one_time_keys (#10504)
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Erik Johnston
GitHub
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c2000ab35b
commit
11540be55e
1
changelog.d/10504.misc
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1
changelog.d/10504.misc
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Reduce errors in PostgreSQL logs due to concurrent serialization errors.
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@ -755,81 +755,145 @@ class EndToEndKeyWorkerStore(EndToEndKeyBackgroundStore):
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"""
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@trace
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def _claim_e2e_one_time_keys(txn):
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sql = (
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"SELECT key_id, key_json FROM e2e_one_time_keys_json"
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" WHERE user_id = ? AND device_id = ? AND algorithm = ?"
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" LIMIT 1"
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)
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fallback_sql = (
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"SELECT key_id, key_json, used FROM e2e_fallback_keys_json"
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" WHERE user_id = ? AND device_id = ? AND algorithm = ?"
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" LIMIT 1"
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)
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result = {}
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delete = []
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used_fallbacks = []
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for user_id, device_id, algorithm in query_list:
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user_result = result.setdefault(user_id, {})
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device_result = user_result.setdefault(device_id, {})
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txn.execute(sql, (user_id, device_id, algorithm))
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otk_row = txn.fetchone()
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if otk_row is not None:
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key_id, key_json = otk_row
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device_result[algorithm + ":" + key_id] = key_json
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delete.append((user_id, device_id, algorithm, key_id))
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else:
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# no one-time key available, so see if there's a fallback
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# key
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txn.execute(fallback_sql, (user_id, device_id, algorithm))
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fallback_row = txn.fetchone()
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if fallback_row is not None:
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key_id, key_json, used = fallback_row
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device_result[algorithm + ":" + key_id] = key_json
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if not used:
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used_fallbacks.append(
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(user_id, device_id, algorithm, key_id)
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)
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def _claim_e2e_one_time_key_simple(
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txn, user_id: str, device_id: str, algorithm: str
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) -> Optional[Tuple[str, str]]:
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"""Claim OTK for device for DBs that don't support RETURNING.
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# drop any one-time keys that were claimed
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sql = (
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"DELETE FROM e2e_one_time_keys_json"
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" WHERE user_id = ? AND device_id = ? AND algorithm = ?"
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" AND key_id = ?"
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Returns:
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A tuple of key name (algorithm + key ID) and key JSON, if an
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OTK was found.
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"""
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sql = """
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SELECT key_id, key_json FROM e2e_one_time_keys_json
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WHERE user_id = ? AND device_id = ? AND algorithm = ?
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LIMIT 1
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"""
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txn.execute(sql, (user_id, device_id, algorithm))
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otk_row = txn.fetchone()
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if otk_row is None:
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return None
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key_id, key_json = otk_row
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self.db_pool.simple_delete_one_txn(
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txn,
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table="e2e_one_time_keys_json",
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keyvalues={
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"user_id": user_id,
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"device_id": device_id,
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"algorithm": algorithm,
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"key_id": key_id,
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},
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)
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for user_id, device_id, algorithm, key_id in delete:
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log_kv(
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{
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"message": "Executing claim e2e_one_time_keys transaction on database."
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}
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self._invalidate_cache_and_stream(
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txn, self.count_e2e_one_time_keys, (user_id, device_id)
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)
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return f"{algorithm}:{key_id}", key_json
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@trace
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def _claim_e2e_one_time_key_returning(
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txn, user_id: str, device_id: str, algorithm: str
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) -> Optional[Tuple[str, str]]:
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"""Claim OTK for device for DBs that support RETURNING.
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Returns:
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A tuple of key name (algorithm + key ID) and key JSON, if an
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OTK was found.
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"""
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# We can use RETURNING to do the fetch and DELETE in once step.
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sql = """
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DELETE FROM e2e_one_time_keys_json
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WHERE user_id = ? AND device_id = ? AND algorithm = ?
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AND key_id IN (
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SELECT key_id FROM e2e_one_time_keys_json
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WHERE user_id = ? AND device_id = ? AND algorithm = ?
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LIMIT 1
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)
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RETURNING key_id, key_json
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"""
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txn.execute(
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sql, (user_id, device_id, algorithm, user_id, device_id, algorithm)
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)
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otk_row = txn.fetchone()
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if otk_row is None:
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return None
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key_id, key_json = otk_row
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return f"{algorithm}:{key_id}", key_json
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results = {}
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for user_id, device_id, algorithm in query_list:
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if self.database_engine.supports_returning:
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# If we support RETURNING clause we can use a single query that
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# allows us to use autocommit mode.
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_claim_e2e_one_time_key = _claim_e2e_one_time_key_returning
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db_autocommit = True
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else:
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_claim_e2e_one_time_key = _claim_e2e_one_time_key_simple
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db_autocommit = False
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row = await self.db_pool.runInteraction(
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"claim_e2e_one_time_keys",
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_claim_e2e_one_time_key,
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user_id,
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device_id,
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algorithm,
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db_autocommit=db_autocommit,
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)
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if row:
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device_results = results.setdefault(user_id, {}).setdefault(
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device_id, {}
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)
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txn.execute(sql, (user_id, device_id, algorithm, key_id))
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log_kv({"message": "finished executing and invalidating cache"})
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self._invalidate_cache_and_stream(
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txn, self.count_e2e_one_time_keys, (user_id, device_id)
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)
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# mark fallback keys as used
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for user_id, device_id, algorithm, key_id in used_fallbacks:
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self.db_pool.simple_update_txn(
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txn,
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"e2e_fallback_keys_json",
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{
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device_results[row[0]] = row[1]
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continue
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# No one-time key available, so see if there's a fallback
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# key
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row = await self.db_pool.simple_select_one(
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table="e2e_fallback_keys_json",
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keyvalues={
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"user_id": user_id,
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"device_id": device_id,
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"algorithm": algorithm,
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},
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retcols=("key_id", "key_json", "used"),
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desc="_get_fallback_key",
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allow_none=True,
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)
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if row is None:
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continue
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key_id = row["key_id"]
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key_json = row["key_json"]
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used = row["used"]
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# Mark fallback key as used if not already.
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if not used:
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await self.db_pool.simple_update_one(
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table="e2e_fallback_keys_json",
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keyvalues={
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"user_id": user_id,
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"device_id": device_id,
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"algorithm": algorithm,
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"key_id": key_id,
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},
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{"used": True},
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updatevalues={"used": True},
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desc="_get_fallback_key_set_used",
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)
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self._invalidate_cache_and_stream(
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txn, self.get_e2e_unused_fallback_key_types, (user_id, device_id)
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await self.invalidate_cache_and_stream(
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"get_e2e_unused_fallback_key_types", (user_id, device_id)
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)
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return result
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device_results = results.setdefault(user_id, {}).setdefault(device_id, {})
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device_results[f"{algorithm}:{key_id}"] = key_json
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return await self.db_pool.runInteraction(
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"claim_e2e_one_time_keys", _claim_e2e_one_time_keys
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)
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return results
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class EndToEndKeyStore(EndToEndKeyWorkerStore, SQLBaseStore):
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