d5dbe546e4
* Always defer *sql.Rows.Close and consult with Err database/sql.Rows.Next() makes sure to call Close only after exhausting result rows which would NOT happen when returning early from a bad Scan. Close being idempotent makes it a great candidate to get always deferred regardless of what happens later on the result set. This change also makes sure call Err() after exhausting Next() and propagate non-nil results from it as the documentation advises. Closes #764 Signed-off-by: Kiril Vladimiroff <kiril@vladimiroff.org> * Override named result parameters in last returns Signed-off-by: Kiril Vladimiroff <kiril@vladimiroff.org> * Do the same over new changes that got merged Signed-off-by: Kiril Vladimiroff <kiril@vladimiroff.org> Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
136 lines
4 KiB
Go
136 lines
4 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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"github.com/lib/pq"
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"github.com/matrix-org/dendrite/common"
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"github.com/matrix-org/dendrite/federationsender/types"
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"github.com/matrix-org/gomatrixserverlib"
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)
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const joinedHostsSchema = `
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-- The joined_hosts table stores a list of m.room.member event ids in the
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-- current state for each room where the membership is "join".
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-- There will be an entry for every user that is joined to the room.
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CREATE TABLE IF NOT EXISTS federationsender_joined_hosts (
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-- The string ID of the room.
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room_id TEXT NOT NULL,
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-- The event ID of the m.room.member join event.
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event_id TEXT NOT NULL,
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-- The domain part of the user ID the m.room.member event is for.
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server_name TEXT NOT NULL
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);
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CREATE UNIQUE INDEX IF NOT EXISTS federatonsender_joined_hosts_event_id_idx
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ON federationsender_joined_hosts (event_id);
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CREATE INDEX IF NOT EXISTS federatonsender_joined_hosts_room_id_idx
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ON federationsender_joined_hosts (room_id)
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`
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const insertJoinedHostsSQL = "" +
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"INSERT INTO federationsender_joined_hosts (room_id, event_id, server_name)" +
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" VALUES ($1, $2, $3)"
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const deleteJoinedHostsSQL = "" +
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"DELETE FROM federationsender_joined_hosts WHERE event_id = ANY($1)"
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const selectJoinedHostsSQL = "" +
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"SELECT event_id, server_name FROM federationsender_joined_hosts" +
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" WHERE room_id = $1"
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type joinedHostsStatements struct {
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insertJoinedHostsStmt *sql.Stmt
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deleteJoinedHostsStmt *sql.Stmt
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selectJoinedHostsStmt *sql.Stmt
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}
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func (s *joinedHostsStatements) prepare(db *sql.DB) (err error) {
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_, err = db.Exec(joinedHostsSchema)
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if err != nil {
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return
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}
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if s.insertJoinedHostsStmt, err = db.Prepare(insertJoinedHostsSQL); err != nil {
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return
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}
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if s.deleteJoinedHostsStmt, err = db.Prepare(deleteJoinedHostsSQL); err != nil {
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return
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}
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if s.selectJoinedHostsStmt, err = db.Prepare(selectJoinedHostsSQL); err != nil {
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return
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}
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return
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}
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func (s *joinedHostsStatements) insertJoinedHosts(
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ctx context.Context,
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txn *sql.Tx,
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roomID, eventID string,
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serverName gomatrixserverlib.ServerName,
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) error {
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stmt := common.TxStmt(txn, s.insertJoinedHostsStmt)
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_, err := stmt.ExecContext(ctx, roomID, eventID, serverName)
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return err
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}
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func (s *joinedHostsStatements) deleteJoinedHosts(
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ctx context.Context, txn *sql.Tx, eventIDs []string,
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) error {
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stmt := common.TxStmt(txn, s.deleteJoinedHostsStmt)
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_, err := stmt.ExecContext(ctx, pq.StringArray(eventIDs))
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return err
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}
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func (s *joinedHostsStatements) selectJoinedHostsWithTx(
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ctx context.Context, txn *sql.Tx, roomID string,
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) ([]types.JoinedHost, error) {
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stmt := common.TxStmt(txn, s.selectJoinedHostsStmt)
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return joinedHostsFromStmt(ctx, stmt, roomID)
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}
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func (s *joinedHostsStatements) selectJoinedHosts(
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ctx context.Context, roomID string,
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) ([]types.JoinedHost, error) {
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return joinedHostsFromStmt(ctx, s.selectJoinedHostsStmt, roomID)
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}
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func joinedHostsFromStmt(
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ctx context.Context, stmt *sql.Stmt, roomID string,
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) ([]types.JoinedHost, error) {
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rows, err := stmt.QueryContext(ctx, roomID)
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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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var result []types.JoinedHost
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for rows.Next() {
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var eventID, serverName string
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if err = rows.Scan(&eventID, &serverName); err != nil {
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return nil, err
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}
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result = append(result, types.JoinedHost{
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MemberEventID: eventID,
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ServerName: gomatrixserverlib.ServerName(serverName),
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})
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}
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return result, rows.Err()
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}
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