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// 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"
"github.com/matrix-org/dendrite/internal/sqlutil"
rstypes "github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/dendrite/syncapi/storage/tables"
"github.com/matrix-org/dendrite/syncapi/types"
)
// 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 selectMembershipCountSQL = "" +
"SELECT COUNT(*) FROM (" +
" SELECT * FROM syncapi_memberships WHERE room_id = $1 AND stream_pos <= $2 GROUP BY user_id HAVING(max(stream_pos))" +
") t WHERE t.membership = $3"
const selectMembershipBeforeSQL = "" +
"SELECT membership, topological_pos FROM syncapi_memberships WHERE room_id = $1 and user_id = $2 AND topological_pos <= $3 ORDER BY topological_pos DESC LIMIT 1"
const selectMembersSQL = `
SELECT event_id FROM
( SELECT event_id, membership FROM syncapi_memberships WHERE room_id = $1 AND topological_pos <= $2 GROUP BY user_id HAVING(max(stream_pos))) t
WHERE ($3 IS NULL OR t.membership = $3)
AND ($4 IS NULL OR t.membership <> $4)
`
const purgeMembershipsSQL = "" +
"DELETE FROM syncapi_memberships WHERE room_id = $1"
type membershipsStatements struct {
db *sql.DB
upsertMembershipStmt *sql.Stmt
selectMembershipCountStmt *sql.Stmt
//selectHeroesStmt *sql.Stmt - prepared at runtime due to variadic
selectMembershipForUserStmt *sql.Stmt
selectMembersStmt *sql.Stmt
purgeMembershipsStmt *sql.Stmt
}
func NewSqliteMembershipsTable(db *sql.DB) (tables.Memberships, error) {
s := &membershipsStatements{
db: db,
}
_, err := db.Exec(membershipsSchema)
if err != nil {
return nil, err
}
return s, sqlutil.StatementList{
{&s.upsertMembershipStmt, upsertMembershipSQL},
{&s.selectMembershipCountStmt, selectMembershipCountSQL},
{&s.selectMembershipForUserStmt, selectMembershipBeforeSQL},
{&s.selectMembersStmt, selectMembersSQL},
{&s.purgeMembershipsStmt, purgeMembershipsSQL},
}.Prepare(db)
}
func (s *membershipsStatements) UpsertMembership(
ctx context.Context, txn *sql.Tx, event *rstypes.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) SelectMembershipCount(
ctx context.Context, txn *sql.Tx, roomID, membership string, pos types.StreamPosition,
) (count int, err error) {
stmt := sqlutil.TxStmt(txn, s.selectMembershipCountStmt)
err = stmt.QueryRowContext(ctx, roomID, pos, membership).Scan(&count)
return
}
// SelectMembershipForUser returns the membership of the user before and including the given position. If no membership can be found
// returns "leave", the topological position and no error. If an error occurs, other than sql.ErrNoRows, returns that and an empty
// string as the membership.
func (s *membershipsStatements) SelectMembershipForUser(
ctx context.Context, txn *sql.Tx, roomID, userID string, pos int64,
) (membership string, topologyPos int, err error) {
stmt := sqlutil.TxStmt(txn, s.selectMembershipForUserStmt)
err = stmt.QueryRowContext(ctx, roomID, userID, pos).Scan(&membership, &topologyPos)
if err != nil {
if err == sql.ErrNoRows {
return "leave", 0, nil
}
return "", 0, err
}
return membership, topologyPos, nil
}
func (s *membershipsStatements) PurgeMemberships(
ctx context.Context, txn *sql.Tx, roomID string,
) error {
_, err := sqlutil.TxStmt(txn, s.purgeMembershipsStmt).ExecContext(ctx, roomID)
return err
}
func (s *membershipsStatements) SelectMemberships(
ctx context.Context, txn *sql.Tx,
roomID string, pos types.TopologyToken,
membership, notMembership *string,
) (eventIDs []string, err error) {
stmt := sqlutil.TxStmt(txn, s.selectMembersStmt)
rows, err := stmt.QueryContext(ctx, roomID, pos.Depth, membership, notMembership)
if err != nil {
return
}
var eventID string
for rows.Next() {
if err = rows.Scan(&eventID); err != nil {
return
}
eventIDs = append(eventIDs, eventID)
}
return eventIDs, rows.Err()
}
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