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