66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
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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"github.com/matrix-org/dendrite/syncapi/types"
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)
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const streamIDTableSchema = `
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-- Global stream ID counter, used by other tables.
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CREATE TABLE IF NOT EXISTS syncapi_stream_id (
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stream_name TEXT NOT NULL PRIMARY KEY,
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stream_id INT DEFAULT 0,
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UNIQUE(stream_name)
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);
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INSERT INTO syncapi_stream_id (stream_name, stream_id) VALUES ("global", 0)
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ON CONFLICT DO NOTHING;
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`
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const increaseStreamIDStmt = "" +
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"UPDATE syncapi_stream_id SET stream_id = stream_id + 1 WHERE stream_name = $1"
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const selectStreamIDStmt = "" +
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"SELECT stream_id FROM syncapi_stream_id WHERE stream_name = $1"
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type streamIDStatements struct {
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db *sql.DB
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writer sqlutil.TransactionWriter
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increaseStreamIDStmt *sql.Stmt
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selectStreamIDStmt *sql.Stmt
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}
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func (s *streamIDStatements) prepare(db *sql.DB) (err error) {
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s.db = db
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s.writer = sqlutil.NewTransactionWriter()
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_, err = db.Exec(streamIDTableSchema)
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if err != nil {
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return
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}
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if s.increaseStreamIDStmt, err = db.Prepare(increaseStreamIDStmt); err != nil {
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return
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}
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if s.selectStreamIDStmt, err = db.Prepare(selectStreamIDStmt); err != nil {
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return
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}
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return
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}
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func (s *streamIDStatements) nextStreamID(ctx context.Context, txn *sql.Tx) (pos types.StreamPosition, err error) {
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increaseStmt := sqlutil.TxStmt(txn, s.increaseStreamIDStmt)
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selectStmt := sqlutil.TxStmt(txn, s.selectStreamIDStmt)
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err = s.writer.Do(s.db, nil, func(txn *sql.Tx) error {
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if _, ierr := increaseStmt.ExecContext(ctx, "global"); err != nil {
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return ierr
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}
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if serr := selectStmt.QueryRowContext(ctx, "global").Scan(&pos); err != nil {
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return serr
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}
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return nil
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})
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return
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}
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