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Bail on where clause instead
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@ -90,6 +90,7 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
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are (user_id, device_id) tuples. The values are also dicts, with
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keys giving the column names
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"""
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res = yield self.runInteraction(
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"get_last_client_ip_by_device",
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self._get_last_client_ip_by_device_txn,
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@ -109,9 +110,6 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
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@classmethod
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def _get_last_client_ip_by_device_txn(cls, txn, devices, retcols):
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if not devices:
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return []
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where_clauses = []
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bindings = []
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for (user_id, device_id) in devices:
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@ -122,6 +120,9 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
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where_clauses.append("(user_id = ? AND device_id = ?)")
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bindings.extend((user_id, device_id))
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if not where_clauses:
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return []
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inner_select = (
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"SELECT MAX(last_seen) mls, user_id, device_id FROM user_ips "
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"WHERE %(where)s "
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