<commit_before># -*- coding: utf-8 -*-
# Copyright 2014-2016 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.

""" This module is responsible for getting events from the DB for pagination
and event streaming.

The order it returns events in depend on whether we are streaming forwards or
are paginating backwards. We do this because we want to handle out of order
messages nicely, while still returning them in the correct order when we
paginate bacwards.

This is implemented by keeping two ordering columns: stream_ordering and
topological_ordering. Stream ordering is basically insertion/received order
(except for events from backfill requests). The topological_ordering is a
weak ordering of events based on the pdu graph.

This means that we have to have two different types of tokens, depending on
what sort order was used:
    - stream tokens are of the form: "s%d", which maps directly to the column
    - topological tokems: "t%d-%d", where the integers map to the topological
      and stream ordering columns respectively.
"""

from twisted.internet import defer

from synapse.storage._base import SQLBaseStore
from synapse.storage.events import EventsWorkerStore

from synapse.types import RoomStreamToken
from synapse.util.caches.stream_change_cache import StreamChangeCache
from synapse.util.logcontext import make_deferred_yieldable, run_in_background
from synapse.storage.engines import PostgresEngine

import abc
import logging

from six.moves import range
from collections import namedtuple


logger = logging.getLogger(__name__)


MAX_STREAM_SIZE = 1000


_STREAM_TOKEN = "stream"
_TOPOLOGICAL_TOKEN = "topological"


# Used as return values for pagination APIs
_EventDictReturn = namedtuple("_EventDictReturn", (
    "event_id", "topological_ordering", "stream_ordering",
))


def lower_bound(token, engine, inclusive=False):
    inclusive = "=" if inclusive else ""
    if token.topological is None:
        return "(%d <%s %s)" % (token.stream, inclusive, "stream_ordering")
    else:
        if isinstance(engine, PostgresEngine):
            # Postgres doesn't optimise ``(x < a) OR (x=a AND y<b)`` as well
            # as it optimises ``(x,y) < (a,b)`` on multicolumn indexes. So we
            # use the later form when running against postgres.
            return "((%d,%d) <%s (%s,%s))" % (
                token.topological, token.stream, inclusive,
                "topological_ordering", "stream_ordering",
            )
        return "(%d < %s OR (%d = %s AND %d <%s %s))" % (
            token.topological, "topological_ordering",
            token.topological, "topological_ordering",
            token.stream, inclusive, "stream_ordering",
        )


def upper_bound(token, engine, inclusive=True):
    inclusive = "=" if inclusive else ""
    if token.topological is None:
        return "(%d >%s %s)" % (token.stream, inclusive, "stream_ordering")
    else:
        if isinstance(engine, PostgresEngine):
            # Postgres doesn't optimise ``(x > a) OR (x=a AND y>b)`` as well
            # as it optimises ``(x,y) > (a,b)`` on multicolumn indexes. So we
            # use the later form when running against postgres.
            return "((%d,%d) >%s (%s,%s))" % (
                token.topological, token.stream, inclusive,
                "topological_ordering", "stream_ordering",
            )
        return "(%d > %s OR (%d = %s AND %d >%s %s))" % (
            token.topological, "topological_ordering",
            token.topological, "topological_ordering",
            token.stream, inclusive, "stream_ordering",
        )


def filter_to_clause(event_filter):
    # NB: This may create SQL clauses that don't optimise well (and we don't
    # have indices on all possible clauses). E.g. it may create
    # "room_id == X AND room_id != X", which postgres doesn't optimise.

    if not event_filter:
        return "", []

    clauses = []
    args = []

    if event_filter.types:
        clauses.append(
            "(%s)" % " OR ".join("type = ?" for _ in event_filter.types)
        )
        args.extend(event_filter.types)

    for typ in event_filter.not_types:
        clauses.append("type != ?")
        args.append(typ)

    if event_filter.senders:
        clauses.append(
            "(%s)" % " OR ".join("sender = ?" for _ in event_filter.senders)
        )
        args.extend(event_filter.senders)

    for sender in event_filter.not_senders:
        clauses.append("sender != ?")
        args.append(sender)

    if event_filter.rooms:
        clauses.append(
            "(%s)" % " OR ".join("room_id = ?" for _ in event_filter.rooms)
        )
        args.extend(event_filter.rooms)

    for room_id in event_filter.not_rooms:
        clauses.append("room_id != ?")
        args.append(room_id)

    if event_filter.contains_url:
        clauses.append("contains_url = ?")
        args.append(event_filter.contains_url)

    return " AND ".join(clauses), args


class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
    """This is an abstract base class where subclasses must implement
    `get_room_max_stream_ordering` and `get_room_min_stream_ordering`
    which can be called in the initializer.
    """

    __metaclass__ = abc.ABCMeta

    def __init__(self, db_conn, hs):
        super(StreamWorkerStore, self).__init__(db_conn, hs)

        events_max = self.get_room_max_stream_ordering()
        event_cache_prefill, min_event_val = self._get_cache_dict(
            db_conn, "events",
            entity_column="room_id",
            stream_column="stream_ordering",
            max_value=events_max,
        )
        self._events_stream_cache = StreamChangeCache(
            "EventsRoomStreamChangeCache", min_event_val,
            prefilled_cache=event_cache_prefill,
        )
        self._membership_stream_cache = StreamChangeCache(
            "MembershipStreamChangeCache", events_max,
        )

        self._stream_order_on_start = self.get_room_max_stream_ordering()

    @abc.abstractmethod
    def get_room_max_stream_ordering(self):
        raise NotImplementedError()

    @abc.abstractmethod
    def get_room_min_stream_ordering(self):
        raise NotImplementedError()

    @defer.inlineCallbacks
    def get_room_events_stream_for_rooms(self, room_ids, from_key, to_key, limit=0,
                                         order='DESC'):
        from_id = RoomStreamToken.parse_stream_token(from_key).stream

        room_ids = yield self._events_stream_cache.get_entities_changed(
            room_ids, from_id
        )

        if not room_ids:
            defer.returnValue({})

        results = {}
        room_ids = list(room_ids)
        for rm_ids in (room_ids[i:i + 20] for i in range(0, len(room_ids), 20)):
            res = yield make_deferred_yieldable(defer.gatherResults([
                run_in_background(
                    self.get_room_events_stream_for_room,
                    room_id, from_key, to_key, limit, order=order,
                )
                for room_id in rm_ids
            ], consumeErrors=True))
            results.update(dict(zip(rm_ids, res)))

        defer.returnValue(results)

    def get_rooms_that_changed(self, room_ids, from_key):
        """Given a list of rooms and a token, return rooms where there may have
        been changes.

        Args:
            room_ids (list)
            from_key (str): The room_key portion of a StreamToken
        """
        from_key = RoomStreamToken.parse_stream_token(from_key).stream
        return set(
            room_id for room_id in room_ids
            if self._events_stream_cache.has_entity_changed(room_id, from_key)
        )

    @defer.inlineCallbacks
    def get_room_events_stream_for_room(self, room_id, from_key, to_key, limit=0,
                                        order='DESC'):
        # Note: If from_key is None then we return in topological order. This
        # is because in that case we're using this as a "get the last few messages
        # in a room" function, rather than "get new messages since last sync"
        if from_key is not None:
            from_id = RoomStreamToken.parse_stream_token(from_key).stream
        else:
            from_id = None
        to_id = RoomStreamToken.parse_stream_token(to_key).stream

        if from_key == to_key:
            defer.returnValue(([], from_key))

        if from_id:
            has_changed = yield self._events_stream_cache.has_entity_changed(
                room_id, from_id
            )

            if not has_changed:
                defer.returnValue(([], from_key))

        def f(txn):
            if from_id is not None:
                sql = (
                    "SELECT event_id, stream_ordering FROM events WHERE"
                    " room_id = ?"
                    " AND not outlier"
                    " AND stream_ordering > ? AND stream_ordering <= ?"
                    " ORDER BY stream_ordering %s LIMIT ?"
                ) % (order,)
                txn.execute(sql, (room_id, from_id, to_id, limit))

                rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]
            else:
                sql = (
                    "SELECT event_id, topological_ordering, stream_ordering"
                    " FROM events"
                    " WHERE"
                    " room_id = ?"
                    " AND not outlier"
                    " AND stream_ordering <= ?"
                    " ORDER BY topological_ordering %s, stream_ordering %s LIMIT ?"
                ) % (order, order,)
                txn.execute(sql, (room_id, to_id, limit))

                rows = [_EventDictReturn(row[0], row[1], row[2]) for row in txn]

            return rows

        rows = yield self.runInteraction("get_room_events_stream_for_room", f)

        ret = yield self._get_events(
            [r.event_id for r in rows],
            get_prev_content=True
        )

        self._set_before_and_after(ret, rows, topo_order=from_id is None)

        if order.lower() == "desc":
            ret.reverse()

        if rows:
            key = "s%d" % min(r.stream_ordering for r in rows)
        else:
            # Assume we didn't get anything because there was nothing to
            # get.
            key = from_key

        defer.returnValue((ret, key))

    @defer.inlineCallbacks
    def get_membership_changes_for_user(self, user_id, from_key, to_key):
        if from_key is not None:
            from_id = RoomStreamToken.parse_stream_token(from_key).stream
        else:
            from_id = None
        to_id = RoomStreamToken.parse_stream_token(to_key).stream

        if from_key == to_key:
            defer.returnValue([])

        if from_id:
            has_changed = self._membership_stream_cache.has_entity_changed(
                user_id, int(from_id)
            )
            if not has_changed:
                defer.returnValue([])

        def f(txn):
            if from_id is not None:
                sql = (
                    "SELECT m.event_id, stream_ordering FROM events AS e,"
                    " room_memberships AS m"
                    " WHERE e.event_id = m.event_id"
                    " AND m.user_id = ?"
                    " AND e.stream_ordering > ? AND e.stream_ordering <= ?"
                    " ORDER BY e.stream_ordering ASC"
                )
                txn.execute(sql, (user_id, from_id, to_id,))
            else:
                sql = (
                    "SELECT m.event_id, stream_ordering FROM events AS e,"
                    " room_memberships AS m"
                    " WHERE e.event_id = m.event_id"
                    " AND m.user_id = ?"
                    " AND stream_ordering <= ?"
                    " ORDER BY stream_ordering ASC"
                )
                txn.execute(sql, (user_id, to_id,))

            rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]

            return rows

        rows = yield self.runInteraction("get_membership_changes_for_user", f)

        ret = yield self._get_events(
            [r.event_id for r in rows],
            get_prev_content=True
        )
<commit_msg>Remove unused code path from member change DB func<commit_after># -*- coding: utf-8 -*-
# Copyright 2014-2016 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.

""" This module is responsible for getting events from the DB for pagination
and event streaming.

The order it returns events in depend on whether we are streaming forwards or
are paginating backwards. We do this because we want to handle out of order
messages nicely, while still returning them in the correct order when we
paginate bacwards.

This is implemented by keeping two ordering columns: stream_ordering and
topological_ordering. Stream ordering is basically insertion/received order
(except for events from backfill requests). The topological_ordering is a
weak ordering of events based on the pdu graph.

This means that we have to have two different types of tokens, depending on
what sort order was used:
    - stream tokens are of the form: "s%d", which maps directly to the column
    - topological tokems: "t%d-%d", where the integers map to the topological
      and stream ordering columns respectively.
"""

from twisted.internet import defer

from synapse.storage._base import SQLBaseStore
from synapse.storage.events import EventsWorkerStore

from synapse.types import RoomStreamToken
from synapse.util.caches.stream_change_cache import StreamChangeCache
from synapse.util.logcontext import make_deferred_yieldable, run_in_background
from synapse.storage.engines import PostgresEngine

import abc
import logging

from six.moves import range
from collections import namedtuple


logger = logging.getLogger(__name__)


MAX_STREAM_SIZE = 1000


_STREAM_TOKEN = "stream"
_TOPOLOGICAL_TOKEN = "topological"


# Used as return values for pagination APIs
_EventDictReturn = namedtuple("_EventDictReturn", (
    "event_id", "topological_ordering", "stream_ordering",
))


def lower_bound(token, engine, inclusive=False):
    inclusive = "=" if inclusive else ""
    if token.topological is None:
        return "(%d <%s %s)" % (token.stream, inclusive, "stream_ordering")
    else:
        if isinstance(engine, PostgresEngine):
            # Postgres doesn't optimise ``(x < a) OR (x=a AND y<b)`` as well
            # as it optimises ``(x,y) < (a,b)`` on multicolumn indexes. So we
            # use the later form when running against postgres.
            return "((%d,%d) <%s (%s,%s))" % (
                token.topological, token.stream, inclusive,
                "topological_ordering", "stream_ordering",
            )
        return "(%d < %s OR (%d = %s AND %d <%s %s))" % (
            token.topological, "topological_ordering",
            token.topological, "topological_ordering",
            token.stream, inclusive, "stream_ordering",
        )


def upper_bound(token, engine, inclusive=True):
    inclusive = "=" if inclusive else ""
    if token.topological is None:
        return "(%d >%s %s)" % (token.stream, inclusive, "stream_ordering")
    else:
        if isinstance(engine, PostgresEngine):
            # Postgres doesn't optimise ``(x > a) OR (x=a AND y>b)`` as well
            # as it optimises ``(x,y) > (a,b)`` on multicolumn indexes. So we
            # use the later form when running against postgres.
            return "((%d,%d) >%s (%s,%s))" % (
                token.topological, token.stream, inclusive,
                "topological_ordering", "stream_ordering",
            )
        return "(%d > %s OR (%d = %s AND %d >%s %s))" % (
            token.topological, "topological_ordering",
            token.topological, "topological_ordering",
            token.stream, inclusive, "stream_ordering",
        )


def filter_to_clause(event_filter):
    # NB: This may create SQL clauses that don't optimise well (and we don't
    # have indices on all possible clauses). E.g. it may create
    # "room_id == X AND room_id != X", which postgres doesn't optimise.

    if not event_filter:
        return "", []

    clauses = []
    args = []

    if event_filter.types:
        clauses.append(
            "(%s)" % " OR ".join("type = ?" for _ in event_filter.types)
        )
        args.extend(event_filter.types)

    for typ in event_filter.not_types:
        clauses.append("type != ?")
        args.append(typ)

    if event_filter.senders:
        clauses.append(
            "(%s)" % " OR ".join("sender = ?" for _ in event_filter.senders)
        )
        args.extend(event_filter.senders)

    for sender in event_filter.not_senders:
        clauses.append("sender != ?")
        args.append(sender)

    if event_filter.rooms:
        clauses.append(
            "(%s)" % " OR ".join("room_id = ?" for _ in event_filter.rooms)
        )
        args.extend(event_filter.rooms)

    for room_id in event_filter.not_rooms:
        clauses.append("room_id != ?")
        args.append(room_id)

    if event_filter.contains_url:
        clauses.append("contains_url = ?")
        args.append(event_filter.contains_url)

    return " AND ".join(clauses), args


class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
    """This is an abstract base class where subclasses must implement
    `get_room_max_stream_ordering` and `get_room_min_stream_ordering`
    which can be called in the initializer.
    """

    __metaclass__ = abc.ABCMeta

    def __init__(self, db_conn, hs):
        super(StreamWorkerStore, self).__init__(db_conn, hs)

        events_max = self.get_room_max_stream_ordering()
        event_cache_prefill, min_event_val = self._get_cache_dict(
            db_conn, "events",
            entity_column="room_id",
            stream_column="stream_ordering",
            max_value=events_max,
        )
        self._events_stream_cache = StreamChangeCache(
            "EventsRoomStreamChangeCache", min_event_val,
            prefilled_cache=event_cache_prefill,
        )
        self._membership_stream_cache = StreamChangeCache(
            "MembershipStreamChangeCache", events_max,
        )

        self._stream_order_on_start = self.get_room_max_stream_ordering()

    @abc.abstractmethod
    def get_room_max_stream_ordering(self):
        raise NotImplementedError()

    @abc.abstractmethod
    def get_room_min_stream_ordering(self):
        raise NotImplementedError()

    @defer.inlineCallbacks
    def get_room_events_stream_for_rooms(self, room_ids, from_key, to_key, limit=0,
                                         order='DESC'):
        from_id = RoomStreamToken.parse_stream_token(from_key).stream

        room_ids = yield self._events_stream_cache.get_entities_changed(
            room_ids, from_id
        )

        if not room_ids:
            defer.returnValue({})

        results = {}
        room_ids = list(room_ids)
        for rm_ids in (room_ids[i:i + 20] for i in range(0, len(room_ids), 20)):
            res = yield make_deferred_yieldable(defer.gatherResults([
                run_in_background(
                    self.get_room_events_stream_for_room,
                    room_id, from_key, to_key, limit, order=order,
                )
                for room_id in rm_ids
            ], consumeErrors=True))
            results.update(dict(zip(rm_ids, res)))

        defer.returnValue(results)

    def get_rooms_that_changed(self, room_ids, from_key):
        """Given a list of rooms and a token, return rooms where there may have
        been changes.

        Args:
            room_ids (list)
            from_key (str): The room_key portion of a StreamToken
        """
        from_key = RoomStreamToken.parse_stream_token(from_key).stream
        return set(
            room_id for room_id in room_ids
            if self._events_stream_cache.has_entity_changed(room_id, from_key)
        )

    @defer.inlineCallbacks
    def get_room_events_stream_for_room(self, room_id, from_key, to_key, limit=0,
                                        order='DESC'):
        # Note: If from_key is None then we return in topological order. This
        # is because in that case we're using this as a "get the last few messages
        # in a room" function, rather than "get new messages since last sync"
        if from_key is not None:
            from_id = RoomStreamToken.parse_stream_token(from_key).stream
        else:
            from_id = None
        to_id = RoomStreamToken.parse_stream_token(to_key).stream

        if from_key == to_key:
            defer.returnValue(([], from_key))

        if from_id:
            has_changed = yield self._events_stream_cache.has_entity_changed(
                room_id, from_id
            )

            if not has_changed:
                defer.returnValue(([], from_key))

        def f(txn):
            if from_id is not None:
                sql = (
                    "SELECT event_id, stream_ordering FROM events WHERE"
                    " room_id = ?"
                    " AND not outlier"
                    " AND stream_ordering > ? AND stream_ordering <= ?"
                    " ORDER BY stream_ordering %s LIMIT ?"
                ) % (order,)
                txn.execute(sql, (room_id, from_id, to_id, limit))

                rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]
            else:
                sql = (
                    "SELECT event_id, topological_ordering, stream_ordering"
                    " FROM events"
                    " WHERE"
                    " room_id = ?"
                    " AND not outlier"
                    " AND stream_ordering <= ?"
                    " ORDER BY topological_ordering %s, stream_ordering %s LIMIT ?"
                ) % (order, order,)
                txn.execute(sql, (room_id, to_id, limit))

                rows = [_EventDictReturn(row[0], row[1], row[2]) for row in txn]

            return rows

        rows = yield self.runInteraction("get_room_events_stream_for_room", f)

        ret = yield self._get_events(
            [r.event_id for r in rows],
            get_prev_content=True
        )

        self._set_before_and_after(ret, rows, topo_order=from_id is None)

        if order.lower() == "desc":
            ret.reverse()

        if rows:
            key = "s%d" % min(r.stream_ordering for r in rows)
        else:
            # Assume we didn't get anything because there was nothing to
            # get.
            key = from_key

        defer.returnValue((ret, key))

    @defer.inlineCallbacks
    def get_membership_changes_for_user(self, user_id, from_key, to_key):
        from_id = RoomStreamToken.parse_stream_token(from_key).stream
        to_id = RoomStreamToken.parse_stream_token(to_key).stream

        if from_key == to_key:
            defer.returnValue([])

        if from_id:
            has_changed = self._membership_stream_cache.has_entity_changed(
                user_id, int(from_id)
            )
            if not has_changed:
                defer.returnValue([])

        def f(txn):
            sql = (
                "SELECT m.event_id, stream_ordering FROM events AS e,"
                " room_memberships AS m"
                " WHERE e.event_id = m.event_id"
                " AND m.user_id = ?"
                " AND e.stream_ordering > ? AND e.stream_ordering <= ?"
                " ORDER BY e.stream_ordering ASC"
            )
            txn.execute(sql, (user_id, from_id, to_id,))

            rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]

            return rows

        rows = yield self.runInteraction("get_membership_changes_for_user", f)

        ret = yield self._get_events(
            [r.event_id for r in rows],
            get_prev_content=True
        )

{'fraction_non_alphanumeric': 0.08966436447352479, 'fraction_numerical': 0.0025041399087200613, 'mean_word_length': 2.2076693872263244, 'pattern_counts': {'":': 2, '<': 24, '<?xml version=': 0, '>': 21, 'https://': 0, 'lorem ipsum': 0, 'www.': 2, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 6, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '7217000', 'n_tokens_mistral': 7331, 'n_tokens_neox': 6902, 'n_words': 1995}