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// Copyright 2017-2018 New Vector Ltd
// Copyright 2019-2020 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 postgres
import (
"context"
"database/sql"
"github.com/matrix-org/dendrite/roomserver/storage/tables"
)
const transactionsSchema = `
-- The transactions table holds transaction IDs with sender's info and event ID it belongs to.
-- This table is used by roomserver to prevent reprocessing of events.
CREATE TABLE IF NOT EXISTS roomserver_transactions (
-- The transaction ID of the event.
transaction_id TEXT NOT NULL,
-- The session ID of the originating transaction.
session_id BIGINT NOT NULL,
-- User ID of the sender who authored the event
user_id TEXT NOT NULL,
-- Event ID corresponding to the transaction
-- Required to return event ID to client on a duplicate request.
event_id TEXT NOT NULL,
-- A transaction ID is unique for a user and device
-- This automatically creates an index.
PRIMARY KEY (transaction_id, session_id, user_id)
);
`
const insertTransactionSQL = "" +
"INSERT INTO roomserver_transactions (transaction_id, session_id, user_id, event_id)" +
" VALUES ($1, $2, $3, $4)"
const selectTransactionEventIDSQL = "" +
"SELECT event_id FROM roomserver_transactions" +
" WHERE transaction_id = $1 AND session_id = $2 AND user_id = $3"
type transactionStatements struct {
insertTransactionStmt *sql.Stmt
selectTransactionEventIDStmt *sql.Stmt
}
func NewPostgresTransactionsTable(db *sql.DB) (tables.Transactions, error) {
s := &transactionStatements{}
_, err := db.Exec(transactionsSchema)
if err != nil {
return nil, err
}
return s, statementList{
{&s.insertTransactionStmt, insertTransactionSQL},
{&s.selectTransactionEventIDStmt, selectTransactionEventIDSQL},
}.prepare(db)
}
func (s *transactionStatements) InsertTransaction(
ctx context.Context, txn *sql.Tx,
transactionID string,
sessionID int64,
userID string,
eventID string,
) (err error) {
_, err = s.insertTransactionStmt.ExecContext(
ctx, transactionID, sessionID, userID, eventID,
)
return
}
func (s *transactionStatements) SelectTransactionEventID(
ctx context.Context,
transactionID string,
sessionID int64,
userID string,
) (eventID string, err error) {
err = s.selectTransactionEventIDStmt.QueryRowContext(
ctx, transactionID, sessionID, userID,
).Scan(&eventID)
return
}
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