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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import ujson
from twisted.internet import defer
from ._base import SQLBaseStore
logger = logging.getLogger(__name__)
class DeviceInboxStore(SQLBaseStore):
@defer.inlineCallbacks
def add_messages_to_device_inbox(self, messages_by_user_then_device):
"""
Args:
messages_by_user_and_device(dict):
Dictionary of user_id to device_id to message.
Returns:
A deferred stream_id that resolves when the messages have been
inserted.
"""
def select_devices_txn(txn, user_id, devices):
if not devices:
return []
sql = (
"SELECT user_id, device_id FROM devices"
" WHERE user_id = ? AND device_id IN ("
+ ",".join("?" * len(devices))
+ ")"
)
# TODO: Maybe this needs to be done in batches if there are
# too many local devices for a given user.
args = [user_id] + devices
txn.execute(sql, args)
return [tuple(row) for row in txn.fetchall()]
def add_messages_to_device_inbox_txn(txn, stream_id):
local_users_and_devices = set()
for user_id, messages_by_device in messages_by_user_then_device.items():
local_users_and_devices.update(
select_devices_txn(txn, user_id, messages_by_device.keys())
)
sql = (
"INSERT INTO device_inbox"
" (user_id, device_id, stream_id, message_json)"
" VALUES (?,?,?,?)"
)
rows = []
for user_id, messages_by_device in messages_by_user_then_device.items():
for device_id, message in messages_by_device.items():
message_json = ujson.dumps(message)
# Only insert into the local inbox if the device exists on
# this server
if (user_id, device_id) in local_users_and_devices:
rows.append((user_id, device_id, stream_id, message_json))
txn.executemany(sql, rows)
with self._device_inbox_id_gen.get_next() as stream_id:
yield self.runInteraction(
"add_messages_to_device_inbox",
add_messages_to_device_inbox_txn,
stream_id
)
defer.returnValue(self._device_inbox_id_gen.get_current_token())
def get_new_messages_for_device(
self, user_id, device_id, last_stream_id, current_stream_id, limit=100
):
"""
Args:
user_id(str): The recipient user_id.
device_id(str): The recipient device_id.
current_stream_id(int): The current position of the to device
message stream.
Returns:
Deferred ([dict], int): List of messages for the device and where
in the stream the messages got to.
"""
def get_new_messages_for_device_txn(txn):
sql = (
"SELECT stream_id, message_json FROM device_inbox"
" WHERE user_id = ? AND device_id = ?"
" AND ? < stream_id AND stream_id <= ?"
" ORDER BY stream_id ASC"
" LIMIT ?"
)
txn.execute(sql, (
user_id, device_id, last_stream_id, current_stream_id, limit
))
messages = []
for row in txn.fetchall():
stream_pos = row[0]
messages.append(ujson.loads(row[1]))
if len(messages) < limit:
stream_pos = current_stream_id
return (messages, stream_pos)
return self.runInteraction(
"get_new_messages_for_device", get_new_messages_for_device_txn,
)
def delete_messages_for_device(self, user_id, device_id, up_to_stream_id):
"""
Args:
user_id(str): The recipient user_id.
device_id(str): The recipient device_id.
up_to_stream_id(int): Where to delete messages up to.
Returns:
A deferred that resolves when the messages have been deleted.
"""
def delete_messages_for_device_txn(txn):
sql = (
"DELETE FROM device_inbox"
" WHERE user_id = ? AND device_id = ?"
" AND stream_id <= ?"
)
txn.execute(sql, (user_id, device_id, up_to_stream_id))
return self.runInteraction(
"delete_messages_for_device", delete_messages_for_device_txn
)
def get_all_new_device_messages(self, last_pos, current_pos, limit):
"""
Args:
last_pos(int):
current_pos(int):
limit(int):
Returns:
A deferred list of rows from the device inbox
"""
if last_pos == current_pos:
return defer.succeed([])
def get_all_new_device_messages_txn(txn):
sql = (
"SELECT stream_id FROM device_inbox"
" WHERE ? < stream_id AND stream_id <= ?"
" GROUP BY stream_id"
" ORDER BY stream_id ASC"
" LIMIT ?"
)
txn.execute(sql, (last_pos, current_pos, limit))
stream_ids = txn.fetchall()
if not stream_ids:
return []
max_stream_id_in_limit = stream_ids[-1]
sql = (
"SELECT stream_id, user_id, device_id, message_json"
" FROM device_inbox"
" WHERE ? < stream_id AND stream_id <= ?"
" ORDER BY stream_id ASC"
)
txn.execute(sql, (last_pos, max_stream_id_in_limit))
return txn.fetchall()
return self.runInteraction(
"get_all_new_device_messages", get_all_new_device_messages_txn
)
def get_to_device_stream_token(self):
return self._device_inbox_id_gen.get_current_token()
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