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