| 1 | package sessioncatalog |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "database/sql" |
| 6 | ) |
| 7 | |
| 8 | // Observe corruption at the shared metadata reader, including Scan/Err where |
| 9 | // SQLite can report a damaged page after QueryContext has already succeeded. |
| 10 | type catalogReader struct { |
| 11 | owner *Catalog |
| 12 | source queryReader |
| 13 | } |
| 14 | type catalogRow struct { |
| 15 | owner *Catalog |
| 16 | row *sql.Row |
| 17 | err error |
| 18 | } |
| 19 | type catalogRows struct { |
| 20 | *sql.Rows |
| 21 | owner *Catalog |
| 22 | } |
| 23 | |
| 24 | func (r catalogReader) QueryRowContext(ctx context.Context, query string, args ...any) *catalogRow { |
| 25 | if err := r.owner.readable(); err != nil { |
| 26 | return &catalogRow{owner: r.owner, err: err} |
| 27 | } |
| 28 | return &catalogRow{owner: r.owner, row: r.source.QueryRowContext(ctx, query, args...)} |
| 29 | } |
| 30 | |
| 31 | func (r *catalogRow) Scan(dest ...any) error { |
| 32 | if err := r.owner.readable(); err != nil { |
| 33 | return err |
| 34 | } |
| 35 | if r.err != nil { |
| 36 | return r.err |
| 37 | } |
| 38 | err := r.row.Scan(dest...) |
| 39 | r.owner.observeDatabaseError(err) |
| 40 | return err |
| 41 | } |
| 42 | |
| 43 | func (r catalogReader) QueryContext(ctx context.Context, query string, args ...any) (*catalogRows, error) { |
| 44 | if err := r.owner.readable(); err != nil { |
| 45 | return nil, err |
| 46 | } |
| 47 | rows, err := r.source.QueryContext(ctx, query, args...) |
| 48 | if err != nil { |
| 49 | r.owner.observeDatabaseError(err) |
| 50 | return nil, err |
| 51 | } |
| 52 | return &catalogRows{rows, r.owner}, nil |
| 53 | } |
| 54 | |
| 55 | func (r *catalogRows) Scan(dest ...any) error { |
| 56 | if err := r.owner.readable(); err != nil { |
| 57 | return err |
| 58 | } |
| 59 | err := r.Rows.Scan(dest...) |
| 60 | r.owner.observeDatabaseError(err) |
| 61 | return err |
| 62 | } |
| 63 | |
| 64 | func (r *catalogRows) Err() error { |
| 65 | if err := r.owner.readable(); err != nil { |
| 66 | return err |
| 67 | } |
| 68 | err := r.Rows.Err() |
| 69 | r.owner.observeDatabaseError(err) |
| 70 | return err |
| 71 | } |
| 72 | |
| 73 | func (r *catalogRows) Next() bool { |
| 74 | return r.owner.readable() == nil && r.Rows.Next() |
| 75 | } |
| 76 | |
| 77 | func (r *catalogRows) Close() error { |
| 78 | err := r.Rows.Close() |
| 79 | r.owner.observeDatabaseError(err) |
| 80 | return err |
| 81 | } |
| 82 |