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dendrite/syncapi/storage/sqlite3/memberships_table.go

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2021-01-20 21:43:20 +01:00
// Copyright 2021 The Matrix.org Foundation C.I.C.
//
// 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.
package sqlite3
import (
"context"
"database/sql"
"fmt"
"strings"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/syncapi/storage/tables"
"github.com/matrix-org/dendrite/syncapi/types"
"github.com/matrix-org/gomatrixserverlib"
)
// The memberships table is designed to track the last time that
// the user was a given state. This allows us to find out the
// most recent time that a user was invited to, joined or left
// a room, either by choice or otherwise. This is important for
// building history visibility.
const membershipsSchema = `
CREATE TABLE IF NOT EXISTS syncapi_memberships (
-- The 'room_id' key for the state event.
room_id TEXT NOT NULL,
-- The state event ID
user_id TEXT NOT NULL,
-- The status of the membership
membership TEXT NOT NULL,
-- The event ID that last changed the membership
event_id TEXT NOT NULL,
-- The stream position of the change
stream_pos BIGINT NOT NULL,
-- The topological position of the change in the room
topological_pos BIGINT NOT NULL,
-- Unique index
UNIQUE (room_id, user_id, membership)
);
`
const upsertMembershipSQL = "" +
"INSERT INTO syncapi_memberships (room_id, user_id, membership, event_id, stream_pos, topological_pos)" +
" VALUES ($1, $2, $3, $4, $5, $6)" +
" ON CONFLICT (room_id, user_id, membership)" +
" DO UPDATE SET event_id = $4, stream_pos = $5, topological_pos = $6"
const selectMembershipSQL = "" +
"SELECT event_id, stream_pos, topological_pos FROM syncapi_memberships" +
" WHERE room_id = $1 AND user_id = $2 AND membership IN ($3)" +
" ORDER BY stream_pos DESC" +
" LIMIT 1"
type membershipsStatements struct {
db *sql.DB
upsertMembershipStmt *sql.Stmt
}
func NewSqliteMembershipsTable(db *sql.DB) (tables.Memberships, error) {
s := &membershipsStatements{
db: db,
}
_, err := db.Exec(membershipsSchema)
if err != nil {
return nil, err
}
if s.upsertMembershipStmt, err = db.Prepare(upsertMembershipSQL); err != nil {
return nil, err
}
return s, nil
}
func (s *membershipsStatements) UpsertMembership(
ctx context.Context, txn *sql.Tx, event *gomatrixserverlib.HeaderedEvent,
streamPos, topologicalPos types.StreamPosition,
) error {
membership, err := event.Membership()
if err != nil {
return fmt.Errorf("event.Membership: %w", err)
}
_, err = sqlutil.TxStmt(txn, s.upsertMembershipStmt).ExecContext(
ctx,
event.RoomID(),
*event.StateKey(),
membership,
event.EventID(),
streamPos,
topologicalPos,
)
return err
}
func (s *membershipsStatements) SelectMembership(
ctx context.Context, txn *sql.Tx, roomID, userID, memberships []string,
) (eventID string, streamPos, topologyPos types.StreamPosition, err error) {
params := []interface{}{roomID, userID}
for _, membership := range memberships {
params = append(params, membership)
}
orig := strings.Replace(selectMembershipSQL, "($3)", sqlutil.QueryVariadicOffset(len(memberships), 2), 1)
stmt, err := s.db.Prepare(orig)
if err != nil {
return "", 0, 0, err
}
err = sqlutil.TxStmt(txn, stmt).QueryRowContext(ctx, params...).Scan(&eventID, &streamPos, &topologyPos)
return
}