dendrite/syncapi/storage/current_room_state_table.go

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// Copyright 2017 Vector Creations 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.
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package storage
import (
"context"
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"database/sql"
"github.com/lib/pq"
"github.com/matrix-org/dendrite/common"
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"github.com/matrix-org/gomatrixserverlib"
)
const currentRoomStateSchema = `
-- Stores the current room state for every room.
CREATE TABLE IF NOT EXISTS syncapi_current_room_state (
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-- The 'room_id' key for the state event.
room_id TEXT NOT NULL,
-- The state event ID
event_id TEXT NOT NULL,
-- The state event type e.g 'm.room.member'
type TEXT NOT NULL,
-- The state_key value for this state event e.g ''
state_key TEXT NOT NULL,
-- The JSON for the event. Stored as TEXT because this should be valid UTF-8.
event_json TEXT NOT NULL,
-- The 'content.membership' value if this event is an m.room.member event. For other
-- events, this will be NULL.
membership TEXT,
-- The serial ID of the output_room_events table when this event became
-- part of the current state of the room.
added_at BIGINT,
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-- Clobber based on 3-uple of room_id, type and state_key
CONSTRAINT syncapi_room_state_unique UNIQUE (room_id, type, state_key)
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);
-- for event deletion
CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_id_idx ON syncapi_current_room_state(event_id);
-- for querying membership states of users
CREATE INDEX IF NOT EXISTS syncapi_membership_idx ON syncapi_current_room_state(type, state_key, membership) WHERE membership IS NOT NULL AND membership != 'leave';
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`
const upsertRoomStateSQL = "" +
"INSERT INTO syncapi_current_room_state (room_id, event_id, type, state_key, event_json, membership, added_at)" +
" VALUES ($1, $2, $3, $4, $5, $6, $7)" +
" ON CONFLICT ON CONSTRAINT syncapi_room_state_unique" +
" DO UPDATE SET event_id = $2, event_json = $5, membership = $6, added_at = $7"
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const deleteRoomStateByEventIDSQL = "" +
"DELETE FROM syncapi_current_room_state WHERE event_id = $1"
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const selectRoomIDsWithMembershipSQL = "" +
"SELECT room_id FROM syncapi_current_room_state WHERE type = 'm.room.member' AND state_key = $1 AND membership = $2"
const selectCurrentStateSQL = "" +
"SELECT event_json FROM syncapi_current_room_state WHERE room_id = $1"
const selectJoinedUsersSQL = "" +
"SELECT room_id, state_key FROM syncapi_current_room_state WHERE type = 'm.room.member' AND membership = 'join'"
const selectStateEventSQL = "" +
"SELECT event_json FROM syncapi_current_room_state WHERE room_id = $1 AND type = $2 AND state_key = $3"
const selectEventsWithEventIDsSQL = "" +
"SELECT added_at, event_json FROM syncapi_current_room_state WHERE event_id = ANY($1)"
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type currentRoomStateStatements struct {
upsertRoomStateStmt *sql.Stmt
deleteRoomStateByEventIDStmt *sql.Stmt
selectRoomIDsWithMembershipStmt *sql.Stmt
selectCurrentStateStmt *sql.Stmt
selectJoinedUsersStmt *sql.Stmt
selectEventsWithEventIDsStmt *sql.Stmt
selectStateEventStmt *sql.Stmt
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}
func (s *currentRoomStateStatements) prepare(db *sql.DB) (err error) {
_, err = db.Exec(currentRoomStateSchema)
if err != nil {
return
}
if s.upsertRoomStateStmt, err = db.Prepare(upsertRoomStateSQL); err != nil {
return
}
if s.deleteRoomStateByEventIDStmt, err = db.Prepare(deleteRoomStateByEventIDSQL); err != nil {
return
}
if s.selectRoomIDsWithMembershipStmt, err = db.Prepare(selectRoomIDsWithMembershipSQL); err != nil {
return
}
if s.selectCurrentStateStmt, err = db.Prepare(selectCurrentStateSQL); err != nil {
return
}
if s.selectJoinedUsersStmt, err = db.Prepare(selectJoinedUsersSQL); err != nil {
return
}
if s.selectEventsWithEventIDsStmt, err = db.Prepare(selectEventsWithEventIDsSQL); err != nil {
return
}
if s.selectStateEventStmt, err = db.Prepare(selectStateEventSQL); err != nil {
return
}
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return
}
// JoinedMemberLists returns a map of room ID to a list of joined user IDs.
func (s *currentRoomStateStatements) selectJoinedUsers(
ctx context.Context,
) (map[string][]string, error) {
rows, err := s.selectJoinedUsersStmt.QueryContext(ctx)
if err != nil {
return nil, err
}
defer rows.Close() // nolint: errcheck
result := make(map[string][]string)
for rows.Next() {
var roomID string
var userID string
if err := rows.Scan(&roomID, &userID); err != nil {
return nil, err
}
users := result[roomID]
users = append(users, userID)
result[roomID] = users
}
return result, nil
}
// SelectRoomIDsWithMembership returns the list of room IDs which have the given user in the given membership state.
func (s *currentRoomStateStatements) selectRoomIDsWithMembership(
ctx context.Context,
txn *sql.Tx,
userID string,
membership string, // nolint: unparam
) ([]string, error) {
stmt := common.TxStmt(txn, s.selectRoomIDsWithMembershipStmt)
rows, err := stmt.QueryContext(ctx, userID, membership)
if err != nil {
return nil, err
}
defer rows.Close() // nolint: errcheck
var result []string
for rows.Next() {
var roomID string
if err := rows.Scan(&roomID); err != nil {
return nil, err
}
result = append(result, roomID)
}
return result, nil
}
// CurrentState returns all the current state events for the given room.
func (s *currentRoomStateStatements) selectCurrentState(
ctx context.Context, txn *sql.Tx, roomID string,
) ([]gomatrixserverlib.Event, error) {
stmt := common.TxStmt(txn, s.selectCurrentStateStmt)
rows, err := stmt.QueryContext(ctx, roomID)
if err != nil {
return nil, err
}
defer rows.Close() // nolint: errcheck
return rowsToEvents(rows)
}
func (s *currentRoomStateStatements) deleteRoomStateByEventID(
ctx context.Context, txn *sql.Tx, eventID string,
) error {
stmt := common.TxStmt(txn, s.deleteRoomStateByEventIDStmt)
_, err := stmt.ExecContext(ctx, eventID)
return err
}
func (s *currentRoomStateStatements) upsertRoomState(
ctx context.Context, txn *sql.Tx,
event gomatrixserverlib.Event, membership *string, addedAt int64,
) error {
stmt := common.TxStmt(txn, s.upsertRoomStateStmt)
_, err := stmt.ExecContext(
ctx,
event.RoomID(),
event.EventID(),
event.Type(),
*event.StateKey(),
event.JSON(),
membership,
addedAt,
)
return err
}
func (s *currentRoomStateStatements) selectEventsWithEventIDs(
ctx context.Context, txn *sql.Tx, eventIDs []string,
) ([]streamEvent, error) {
stmt := common.TxStmt(txn, s.selectEventsWithEventIDsStmt)
rows, err := stmt.QueryContext(ctx, pq.StringArray(eventIDs))
if err != nil {
return nil, err
}
defer rows.Close() // nolint: errcheck
return rowsToStreamEvents(rows)
}
func rowsToEvents(rows *sql.Rows) ([]gomatrixserverlib.Event, error) {
result := []gomatrixserverlib.Event{}
for rows.Next() {
var eventBytes []byte
if err := rows.Scan(&eventBytes); err != nil {
return nil, err
}
// TODO: Handle redacted events
ev, err := gomatrixserverlib.NewEventFromTrustedJSON(eventBytes, false)
if err != nil {
return nil, err
}
result = append(result, ev)
}
return result, nil
}
func (s *currentRoomStateStatements) selectStateEvent(
ctx context.Context, roomID, evType, stateKey string,
) (*gomatrixserverlib.Event, error) {
stmt := s.selectStateEventStmt
var res []byte
err := stmt.QueryRowContext(ctx, roomID, evType, stateKey).Scan(&res)
if err == sql.ErrNoRows {
return nil, nil
}
if err != nil {
return nil, err
}
ev, err := gomatrixserverlib.NewEventFromTrustedJSON(res, false)
return &ev, err
}