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dendrite/federationsender/storage/sqlite3/blacklist_table.go

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// Copyright 2020 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"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/gomatrixserverlib"
)
const blacklistSchema = `
CREATE TABLE IF NOT EXISTS federationsender_blacklist (
-- The blacklisted server name
server_name TEXT NOT NULL,
UNIQUE (server_name)
);
`
const insertBlacklistSQL = "" +
"INSERT INTO federationsender_blacklist (server_name) VALUES ($1)" +
" ON CONFLICT DO NOTHING"
const selectBlacklistSQL = "" +
"SELECT server_name FROM federationsender_blacklist WHERE server_name = $1"
const deleteBlacklistSQL = "" +
"DELETE FROM federationsender_blacklist WHERE server_name = $1"
type blacklistStatements struct {
db *sql.DB
insertBlacklistStmt *sql.Stmt
selectBlacklistStmt *sql.Stmt
deleteBlacklistStmt *sql.Stmt
}
func NewSQLiteBlacklistTable(db *sql.DB) (s *blacklistStatements, err error) {
s = &blacklistStatements{
db: db,
}
_, err = db.Exec(blacklistSchema)
if err != nil {
return
}
if s.insertBlacklistStmt, err = db.Prepare(insertBlacklistSQL); err != nil {
return
}
if s.selectBlacklistStmt, err = db.Prepare(selectBlacklistSQL); err != nil {
return
}
if s.deleteBlacklistStmt, err = db.Prepare(deleteBlacklistSQL); err != nil {
return
}
return
}
// insertRoom inserts the room if it didn't already exist.
// If the room didn't exist then last_event_id is set to the empty string.
func (s *blacklistStatements) InsertBlacklist(
ctx context.Context, txn *sql.Tx, serverName gomatrixserverlib.ServerName,
) error {
stmt := sqlutil.TxStmt(txn, s.insertBlacklistStmt)
_, err := stmt.ExecContext(ctx, serverName)
return err
}
// selectRoomForUpdate locks the row for the room and returns the last_event_id.
// The row must already exist in the table. Callers can ensure that the row
// exists by calling insertRoom first.
func (s *blacklistStatements) SelectBlacklist(
ctx context.Context, txn *sql.Tx, serverName gomatrixserverlib.ServerName,
) (bool, error) {
stmt := sqlutil.TxStmt(txn, s.selectBlacklistStmt)
res, err := stmt.QueryContext(ctx, serverName)
if err != nil {
return false, err
}
defer res.Close() // nolint:errcheck
// The query will return the server name if the server is blacklisted, and
// will return no rows if not. By calling Next, we find out if a row was
// returned or not - we don't care about the value itself.
return res.Next(), nil
}
// updateRoom updates the last_event_id for the room. selectRoomForUpdate should
// have already been called earlier within the transaction.
func (s *blacklistStatements) DeleteBlacklist(
ctx context.Context, txn *sql.Tx, serverName gomatrixserverlib.ServerName,
) error {
stmt := sqlutil.TxStmt(txn, s.deleteBlacklistStmt)
_, err := stmt.ExecContext(ctx, serverName)
return err
}