448 lines
16 KiB
Go
448 lines
16 KiB
Go
// Copyright 2017-2018 New Vector Ltd
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// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
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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 postgres
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import (
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"context"
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"database/sql"
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"encoding/json"
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"sort"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/syncapi/storage/tables"
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"github.com/matrix-org/dendrite/syncapi/types"
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"github.com/lib/pq"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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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 CONSTRAINT syncapi_event_id_idx UNIQUE,
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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 headered JSON for the event, containing potentially additional metadata such as
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-- the room version. Stored as TEXT because this should be valid UTF-8.
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headered_event_json TEXT NOT NULL,
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-- The event type e.g 'm.room.member'.
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type TEXT NOT NULL,
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-- The 'sender' property of the event.
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sender TEXT NOT NULL,
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-- true if the event content contains a url key.
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contains_url BOOL 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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-- The client session that sent the event, if any
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session_id BIGINT,
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-- The transaction id used to send the event, if any
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transaction_id TEXT,
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-- Should the event be excluded from responses to /sync requests. Useful for
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-- events retrieved through backfilling that have a position in the stream
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-- that relates to the moment these were retrieved rather than the moment these
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-- were emitted.
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exclude_from_sync BOOL DEFAULT FALSE
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);
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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, headered_event_json, type, sender, contains_url, add_state_ids, remove_state_ids, session_id, transaction_id, exclude_from_sync" +
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") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11) " +
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"ON CONFLICT ON CONSTRAINT syncapi_event_id_idx DO UPDATE SET exclude_from_sync = $11 " +
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"RETURNING id"
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const selectEventsSQL = "" +
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"SELECT id, headered_event_json, session_id, exclude_from_sync, transaction_id FROM syncapi_output_room_events WHERE event_id = ANY($1)"
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const selectRecentEventsSQL = "" +
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"SELECT id, headered_event_json, session_id, exclude_from_sync, 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 selectRecentEventsForSyncSQL = "" +
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"SELECT id, headered_event_json, session_id, exclude_from_sync, transaction_id FROM syncapi_output_room_events" +
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" WHERE room_id = $1 AND id > $2 AND id <= $3 AND exclude_from_sync = FALSE" +
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" ORDER BY id DESC LIMIT $4"
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const selectEarlyEventsSQL = "" +
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"SELECT id, headered_event_json, session_id, exclude_from_sync, 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 ASC LIMIT $4"
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const selectMaxEventIDSQL = "" +
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"SELECT MAX(id) FROM syncapi_output_room_events"
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const updateEventJSONSQL = "" +
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"UPDATE syncapi_output_room_events SET headered_event_json=$1 WHERE event_id=$2"
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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, headered_event_json, exclude_from_sync, 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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" AND ( $3::text[] IS NULL OR sender = ANY($3) )" +
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" AND ( $4::text[] IS NULL OR NOT(sender = ANY($4)) )" +
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" AND ( $5::text[] IS NULL OR type LIKE ANY($5) )" +
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" AND ( $6::text[] IS NULL OR NOT(type LIKE ANY($6)) )" +
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" AND ( $7::bool IS NULL OR contains_url = $7 )" +
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" ORDER BY id ASC" +
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" LIMIT $8"
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const deleteEventsForRoomSQL = "" +
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"DELETE FROM syncapi_output_room_events WHERE room_id = $1"
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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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selectRecentEventsForSyncStmt *sql.Stmt
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selectEarlyEventsStmt *sql.Stmt
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selectStateInRangeStmt *sql.Stmt
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updateEventJSONStmt *sql.Stmt
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deleteEventsForRoomStmt *sql.Stmt
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}
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func NewPostgresEventsTable(db *sql.DB) (tables.Events, error) {
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s := &outputRoomEventsStatements{}
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_, err := db.Exec(outputRoomEventsSchema)
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if err != nil {
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return nil, err
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}
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if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
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return nil, err
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}
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if s.selectEventsStmt, err = db.Prepare(selectEventsSQL); err != nil {
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return nil, err
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}
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if s.selectMaxEventIDStmt, err = db.Prepare(selectMaxEventIDSQL); err != nil {
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return nil, err
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}
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if s.selectRecentEventsStmt, err = db.Prepare(selectRecentEventsSQL); err != nil {
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return nil, err
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}
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if s.selectRecentEventsForSyncStmt, err = db.Prepare(selectRecentEventsForSyncSQL); err != nil {
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return nil, err
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}
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if s.selectEarlyEventsStmt, err = db.Prepare(selectEarlyEventsSQL); err != nil {
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return nil, err
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}
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if s.selectStateInRangeStmt, err = db.Prepare(selectStateInRangeSQL); err != nil {
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return nil, err
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}
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if s.updateEventJSONStmt, err = db.Prepare(updateEventJSONSQL); err != nil {
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return nil, err
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}
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if s.deleteEventsForRoomStmt, err = db.Prepare(deleteEventsForRoomSQL); err != nil {
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return nil, err
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}
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return s, nil
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}
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func (s *outputRoomEventsStatements) UpdateEventJSON(ctx context.Context, event *gomatrixserverlib.HeaderedEvent) error {
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headeredJSON, err := json.Marshal(event)
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if err != nil {
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return err
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}
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_, err = s.updateEventJSONStmt.ExecContext(ctx, headeredJSON, event.EventID())
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return err
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}
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// selectStateInRange returns the state events between the two given PDU 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, r types.Range,
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stateFilter *gomatrixserverlib.StateFilter,
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) (map[string]map[string]bool, map[string]types.StreamEvent, error) {
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stmt := sqlutil.TxStmt(txn, s.selectStateInRangeStmt)
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rows, err := stmt.QueryContext(
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ctx, r.Low(), r.High(),
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pq.StringArray(stateFilter.Senders),
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pq.StringArray(stateFilter.NotSenders),
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pq.StringArray(filterConvertTypeWildcardToSQL(stateFilter.Types)),
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pq.StringArray(filterConvertTypeWildcardToSQL(stateFilter.NotTypes)),
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stateFilter.ContainsURL,
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stateFilter.Limit,
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)
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if err != nil {
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return nil, nil, err
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}
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defer internal.CloseAndLogIfError(ctx, rows, "selectStateInRange: rows.close() failed")
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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]types.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 types.StreamPosition
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eventBytes []byte
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excludeFromSync bool
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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, &excludeFromSync, &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": r.From,
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"current": r.To,
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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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var ev gomatrixserverlib.HeaderedEvent
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if err := json.Unmarshal(eventBytes, &ev); 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()] = types.StreamEvent{
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HeaderedEvent: &ev,
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StreamPosition: streamPos,
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ExcludeFromSync: excludeFromSync,
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}
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}
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return stateNeeded, eventIDToEvent, rows.Err()
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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 := sqlutil.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.HeaderedEvent, addState, removeState []string,
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transactionID *api.TransactionID, excludeFromSync bool,
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) (streamPos types.StreamPosition, err error) {
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var txnID *string
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var sessionID *int64
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if transactionID != nil {
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sessionID = &transactionID.SessionID
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txnID = &transactionID.TransactionID
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}
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// Parse content as JSON and search for an "url" key
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containsURL := false
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var content map[string]interface{}
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if json.Unmarshal(event.Content(), &content) != nil {
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// Set containsURL to true if url is present
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_, containsURL = content["url"]
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}
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var headeredJSON []byte
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headeredJSON, err = json.Marshal(event)
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if err != nil {
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return
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}
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stmt := sqlutil.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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headeredJSON,
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event.Type(),
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event.Sender(),
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containsURL,
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pq.StringArray(addState),
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pq.StringArray(removeState),
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sessionID,
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txnID,
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excludeFromSync,
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).Scan(&streamPos)
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return
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}
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// selectRecentEvents returns the most recent events in the given room, up to a maximum of 'limit'.
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// If onlySyncEvents has a value of true, only returns the events that aren't marked as to exclude
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// from sync.
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func (s *outputRoomEventsStatements) SelectRecentEvents(
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ctx context.Context, txn *sql.Tx,
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roomID string, r types.Range, limit int,
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chronologicalOrder bool, onlySyncEvents bool,
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) ([]types.StreamEvent, bool, error) {
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var stmt *sql.Stmt
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if onlySyncEvents {
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stmt = sqlutil.TxStmt(txn, s.selectRecentEventsForSyncStmt)
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} else {
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stmt = sqlutil.TxStmt(txn, s.selectRecentEventsStmt)
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}
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rows, err := stmt.QueryContext(ctx, roomID, r.Low(), r.High(), limit+1)
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if err != nil {
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return nil, false, err
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}
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defer internal.CloseAndLogIfError(ctx, rows, "selectRecentEvents: rows.close() failed")
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events, err := rowsToStreamEvents(rows)
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if err != nil {
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return nil, false, err
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}
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if chronologicalOrder {
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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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}
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// we queried for 1 more than the limit, so if we returned one more mark limited=true
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limited := false
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if len(events) > limit {
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limited = true
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// re-slice the extra (oldest) event out: in chronological order this is the first entry, else the last.
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if chronologicalOrder {
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events = events[1:]
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} else {
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events = events[:len(events)-1]
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}
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}
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return events, limited, nil
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}
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// selectEarlyEvents returns the earliest events in the given room, starting
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// from a given position, up to a maximum of 'limit'.
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func (s *outputRoomEventsStatements) SelectEarlyEvents(
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ctx context.Context, txn *sql.Tx,
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roomID string, r types.Range, limit int,
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) ([]types.StreamEvent, error) {
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stmt := sqlutil.TxStmt(txn, s.selectEarlyEventsStmt)
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rows, err := stmt.QueryContext(ctx, roomID, r.Low(), r.High(), limit)
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if err != nil {
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return nil, err
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}
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defer internal.CloseAndLogIfError(ctx, rows, "selectEarlyEvents: rows.close() failed")
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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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// necessarily 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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// selectEvents returns the events for the given event IDs. If an event is
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// missing from the database, it will be omitted.
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func (s *outputRoomEventsStatements) SelectEvents(
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ctx context.Context, txn *sql.Tx, eventIDs []string,
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) ([]types.StreamEvent, error) {
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stmt := sqlutil.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 internal.CloseAndLogIfError(ctx, rows, "selectEvents: rows.close() failed")
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return rowsToStreamEvents(rows)
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}
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func (s *outputRoomEventsStatements) DeleteEventsForRoom(
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ctx context.Context, txn *sql.Tx, roomID string,
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) (err error) {
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_, err = sqlutil.TxStmt(txn, s.deleteEventsForRoomStmt).ExecContext(ctx, roomID)
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return err
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}
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func rowsToStreamEvents(rows *sql.Rows) ([]types.StreamEvent, error) {
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var result []types.StreamEvent
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for rows.Next() {
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var (
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streamPos types.StreamPosition
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eventBytes []byte
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excludeFromSync bool
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sessionID *int64
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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, &sessionID, &excludeFromSync, &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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var ev gomatrixserverlib.HeaderedEvent
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if err := json.Unmarshal(eventBytes, &ev); err != nil {
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return nil, err
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}
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if sessionID != nil && txnID != nil {
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transactionID = &api.TransactionID{
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SessionID: *sessionID,
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TransactionID: *txnID,
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}
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}
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result = append(result, types.StreamEvent{
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HeaderedEvent: &ev,
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StreamPosition: streamPos,
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TransactionID: transactionID,
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ExcludeFromSync: excludeFromSync,
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})
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}
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return result, rows.Err()
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}
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