mirror of
https://github.com/hoernschen/dendrite.git
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294 lines
9.9 KiB
Go
294 lines
9.9 KiB
Go
// Copyright 2017 Vector Creations Ltd
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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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package storage
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import (
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"context"
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"database/sql"
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"sort"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/lib/pq"
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"github.com/matrix-org/dendrite/common"
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"github.com/matrix-org/dendrite/syncapi/types"
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"github.com/matrix-org/gomatrixserverlib"
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log "github.com/sirupsen/logrus"
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)
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const outputRoomEventsSchema = `
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-- This sequence is shared between all the tables generated from kafka logs.
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CREATE SEQUENCE IF NOT EXISTS syncapi_stream_id;
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-- Stores output room events received from the roomserver.
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CREATE TABLE IF NOT EXISTS syncapi_output_room_events (
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-- An incrementing ID which denotes the position in the log that this event resides at.
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-- NB: 'serial' makes no guarantees to increment by 1 every time, only that it increments.
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-- This isn't a problem for us since we just want to order by this field.
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id BIGINT PRIMARY KEY DEFAULT nextval('syncapi_stream_id'),
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-- The event ID for the event
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event_id TEXT NOT NULL,
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-- The 'room_id' key for the event.
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room_id TEXT NOT NULL,
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-- The JSON for the event. Stored as TEXT because this should be valid UTF-8.
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event_json TEXT NOT NULL,
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-- A list of event IDs which represent a delta of added/removed room state. This can be NULL
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-- if there is no delta.
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add_state_ids TEXT[],
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remove_state_ids TEXT[],
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device_id TEXT, -- The local device that sent the event, if any
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transaction_id TEXT -- The transaction id used to send the event, if any
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);
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-- for event selection
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CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_id_idx ON syncapi_output_room_events(event_id);
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`
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const insertEventSQL = "" +
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"INSERT INTO syncapi_output_room_events (" +
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" room_id, event_id, event_json, add_state_ids, remove_state_ids, device_id, transaction_id" +
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") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING id"
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const selectEventsSQL = "" +
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"SELECT id, event_json FROM syncapi_output_room_events WHERE event_id = ANY($1)"
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const selectRecentEventsSQL = "" +
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"SELECT id, event_json, device_id, transaction_id FROM syncapi_output_room_events" +
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" WHERE room_id = $1 AND id > $2 AND id <= $3" +
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" ORDER BY id DESC LIMIT $4"
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const selectMaxEventIDSQL = "" +
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"SELECT MAX(id) FROM syncapi_output_room_events"
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// In order for us to apply the state updates correctly, rows need to be ordered in the order they were received (id).
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const selectStateInRangeSQL = "" +
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"SELECT id, event_json, add_state_ids, remove_state_ids" +
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" FROM syncapi_output_room_events" +
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" WHERE (id > $1 AND id <= $2) AND (add_state_ids IS NOT NULL OR remove_state_ids IS NOT NULL)" +
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" ORDER BY id ASC"
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type outputRoomEventsStatements struct {
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insertEventStmt *sql.Stmt
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selectEventsStmt *sql.Stmt
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selectMaxEventIDStmt *sql.Stmt
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selectRecentEventsStmt *sql.Stmt
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selectStateInRangeStmt *sql.Stmt
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}
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func (s *outputRoomEventsStatements) prepare(db *sql.DB) (err error) {
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_, err = db.Exec(outputRoomEventsSchema)
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if err != nil {
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return
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}
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if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
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return
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}
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if s.selectEventsStmt, err = db.Prepare(selectEventsSQL); err != nil {
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return
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}
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if s.selectMaxEventIDStmt, err = db.Prepare(selectMaxEventIDSQL); err != nil {
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return
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}
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if s.selectRecentEventsStmt, err = db.Prepare(selectRecentEventsSQL); err != nil {
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return
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}
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if s.selectStateInRangeStmt, err = db.Prepare(selectStateInRangeSQL); err != nil {
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return
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}
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return
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}
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// selectStateInRange returns the state events between the two given stream positions, exclusive of oldPos, inclusive of newPos.
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// Results are bucketed based on the room ID. If the same state is overwritten multiple times between the
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// two positions, only the most recent state is returned.
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func (s *outputRoomEventsStatements) selectStateInRange(
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ctx context.Context, txn *sql.Tx, oldPos, newPos types.StreamPosition,
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) (map[string]map[string]bool, map[string]streamEvent, error) {
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stmt := common.TxStmt(txn, s.selectStateInRangeStmt)
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rows, err := stmt.QueryContext(ctx, oldPos, newPos)
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if err != nil {
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return nil, nil, err
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}
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// Fetch all the state change events for all rooms between the two positions then loop each event and:
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// - Keep a cache of the event by ID (99% of state change events are for the event itself)
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// - For each room ID, build up an array of event IDs which represents cumulative adds/removes
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// For each room, map cumulative event IDs to events and return. This may need to a batch SELECT based on event ID
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// if they aren't in the event ID cache. We don't handle state deletion yet.
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eventIDToEvent := make(map[string]streamEvent)
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// RoomID => A set (map[string]bool) of state event IDs which are between the two positions
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stateNeeded := make(map[string]map[string]bool)
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for rows.Next() {
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var (
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streamPos int64
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eventBytes []byte
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addIDs pq.StringArray
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delIDs pq.StringArray
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)
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if err := rows.Scan(&streamPos, &eventBytes, &addIDs, &delIDs); err != nil {
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return nil, nil, err
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}
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// Sanity check for deleted state and whine if we see it. We don't need to do anything
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// since it'll just mark the event as not being needed.
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if len(addIDs) < len(delIDs) {
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log.WithFields(log.Fields{
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"since": oldPos,
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"current": newPos,
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"adds": addIDs,
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"dels": delIDs,
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}).Warn("StateBetween: ignoring deleted state")
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}
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// TODO: Handle redacted events
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ev, err := gomatrixserverlib.NewEventFromTrustedJSON(eventBytes, false)
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if err != nil {
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return nil, nil, err
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}
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needSet := stateNeeded[ev.RoomID()]
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if needSet == nil { // make set if required
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needSet = make(map[string]bool)
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}
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for _, id := range delIDs {
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needSet[id] = false
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}
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for _, id := range addIDs {
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needSet[id] = true
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}
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stateNeeded[ev.RoomID()] = needSet
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eventIDToEvent[ev.EventID()] = streamEvent{
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Event: ev,
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streamPosition: types.StreamPosition(streamPos),
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}
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}
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return stateNeeded, eventIDToEvent, nil
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}
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// MaxID returns the ID of the last inserted event in this table. 'txn' is optional. If it is not supplied,
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// then this function should only ever be used at startup, as it will race with inserting events if it is
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// done afterwards. If there are no inserted events, 0 is returned.
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func (s *outputRoomEventsStatements) selectMaxEventID(
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ctx context.Context, txn *sql.Tx,
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) (id int64, err error) {
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var nullableID sql.NullInt64
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stmt := common.TxStmt(txn, s.selectMaxEventIDStmt)
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err = stmt.QueryRowContext(ctx).Scan(&nullableID)
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if nullableID.Valid {
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id = nullableID.Int64
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}
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return
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}
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// InsertEvent into the output_room_events table. addState and removeState are an optional list of state event IDs. Returns the position
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// of the inserted event.
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func (s *outputRoomEventsStatements) insertEvent(
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ctx context.Context, txn *sql.Tx,
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event *gomatrixserverlib.Event, addState, removeState []string,
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transactionID *api.TransactionID,
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) (streamPos int64, err error) {
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var deviceID, txnID *string
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if transactionID != nil {
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deviceID = &transactionID.DeviceID
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txnID = &transactionID.TransactionID
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}
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stmt := common.TxStmt(txn, s.insertEventStmt)
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err = stmt.QueryRowContext(
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ctx,
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event.RoomID(),
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event.EventID(),
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event.JSON(),
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pq.StringArray(addState),
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pq.StringArray(removeState),
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deviceID,
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txnID,
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).Scan(&streamPos)
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return
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}
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// RecentEventsInRoom returns the most recent events in the given room, up to a maximum of 'limit'.
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func (s *outputRoomEventsStatements) selectRecentEvents(
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ctx context.Context, txn *sql.Tx,
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roomID string, fromPos, toPos types.StreamPosition, limit int,
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) ([]streamEvent, error) {
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stmt := common.TxStmt(txn, s.selectRecentEventsStmt)
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rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, limit)
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if err != nil {
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return nil, err
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}
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defer rows.Close() // nolint: errcheck
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events, err := rowsToStreamEvents(rows)
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if err != nil {
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return nil, err
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}
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// The events need to be returned from oldest to latest, which isn't
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// necessary the way the SQL query returns them, so a sort is necessary to
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// ensure the events are in the right order in the slice.
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sort.SliceStable(events, func(i int, j int) bool {
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return events[i].streamPosition < events[j].streamPosition
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})
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return events, nil
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}
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// Events returns the events for the given event IDs. Returns an error if any one of the event IDs given are missing
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// from the database.
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func (s *outputRoomEventsStatements) selectEvents(
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ctx context.Context, txn *sql.Tx, eventIDs []string,
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) ([]streamEvent, error) {
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stmt := common.TxStmt(txn, s.selectEventsStmt)
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rows, err := stmt.QueryContext(ctx, pq.StringArray(eventIDs))
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if err != nil {
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return nil, err
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}
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defer rows.Close() // nolint: errcheck
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return rowsToStreamEvents(rows)
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}
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func rowsToStreamEvents(rows *sql.Rows) ([]streamEvent, error) {
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var result []streamEvent
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for rows.Next() {
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var (
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streamPos int64
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eventBytes []byte
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deviceID *string
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txnID *string
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transactionID *api.TransactionID
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)
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if err := rows.Scan(&streamPos, &eventBytes, &deviceID, &txnID); err != nil {
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return nil, err
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}
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// TODO: Handle redacted events
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ev, err := gomatrixserverlib.NewEventFromTrustedJSON(eventBytes, false)
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if err != nil {
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return nil, err
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}
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if deviceID != nil && txnID != nil {
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transactionID = &api.TransactionID{
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DeviceID: *deviceID,
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TransactionID: *txnID,
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}
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}
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result = append(result, streamEvent{
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Event: ev,
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streamPosition: types.StreamPosition(streamPos),
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transactionID: transactionID,
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})
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}
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return result, nil
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}
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