83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
// Copyright 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 sqlite3
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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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)
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const txnIDSchema = `
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-- Keeps a count of the current transaction ID
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CREATE TABLE IF NOT EXISTS appservice_counters (
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name TEXT PRIMARY KEY NOT NULL,
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last_id INTEGER DEFAULT 1
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);
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INSERT OR IGNORE INTO appservice_counters (name, last_id) VALUES('txn_id', 1);
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`
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const selectTxnIDSQL = `
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SELECT last_id FROM appservice_counters WHERE name='txn_id'
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`
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const updateTxnIDSQL = `
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UPDATE appservice_counters SET last_id=last_id+1 WHERE name='txn_id'
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`
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type txnStatements struct {
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db *sql.DB
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writer sqlutil.Writer
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selectTxnIDStmt *sql.Stmt
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updateTxnIDStmt *sql.Stmt
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}
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func (s *txnStatements) prepare(db *sql.DB, writer sqlutil.Writer) (err error) {
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s.db = db
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s.writer = writer
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_, err = db.Exec(txnIDSchema)
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if err != nil {
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return
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}
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if s.selectTxnIDStmt, err = db.Prepare(selectTxnIDSQL); err != nil {
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return
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}
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if s.updateTxnIDStmt, err = db.Prepare(updateTxnIDSQL); err != nil {
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return
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}
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return
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}
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// selectTxnID selects the latest ascending transaction ID
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func (s *txnStatements) selectTxnID(
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ctx context.Context,
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) (txnID int, err error) {
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err = s.writer.Do(s.db, nil, func(txn *sql.Tx) error {
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err := s.selectTxnIDStmt.QueryRowContext(ctx).Scan(&txnID)
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if err != nil {
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return err
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}
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_, err = s.updateTxnIDStmt.ExecContext(ctx)
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return err
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})
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return
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}
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