| 1 | // Package store owns persistence: cells, rows, columns, formats and the |
| 2 | // append-only event log. |
| 3 | package store |
| 4 | |
| 5 | import ( |
| 6 | "encoding/json" |
| 7 | |
| 8 | "gorm.io/gorm" |
| 9 | |
| 10 | "amadan.net/oficina/sheets/internal/sheets/seal" |
| 11 | ) |
| 12 | |
| 13 | // Event kinds. Two, deliberately: conflating them is what made an earlier |
| 14 | // draft of the leak list wrong. |
| 15 | const ( |
| 16 | KindInput = "input" |
| 17 | KindRecalc = "recalc" |
| 18 | ) |
| 19 | |
| 20 | // InputEvent is a person's edit, before sealing. |
| 21 | type InputEvent struct { |
| 22 | TabID, RowID, ColID uint64 |
| 23 | ActorID uint64 |
| 24 | OldRaw, NewRaw string |
| 25 | } |
| 26 | |
| 27 | type inputPayload struct { |
| 28 | RowID uint64 `json:"r"` |
| 29 | ColID uint64 `json:"c"` |
| 30 | OldRaw string `json:"o"` |
| 31 | NewRaw string `json:"n"` |
| 32 | } |
| 33 | |
| 34 | // AppendInput writes a sealed input event. Old and new raw input are user |
| 35 | // content, so the payload is sealed; the row's shape is not. |
| 36 | func AppendInput(tx *gorm.DB, s *seal.Sealer, e InputEvent) error { |
| 37 | body, err := json.Marshal(inputPayload{ |
| 38 | RowID: e.RowID, ColID: e.ColID, OldRaw: e.OldRaw, NewRaw: e.NewRaw, |
| 39 | }) |
| 40 | if err != nil { |
| 41 | return err |
| 42 | } |
| 43 | sealed, err := s.Seal("event.payload", body) |
| 44 | if err != nil { |
| 45 | return err |
| 46 | } |
| 47 | return tx.Create(&Event{ |
| 48 | Kind: KindInput, TabID: e.TabID, ActorID: e.ActorID, |
| 49 | PayloadSealed: sealed, |
| 50 | }).Error |
| 51 | } |
| 52 | |
| 53 | // AppendRecalc records that a recalculation pass ran and how wide it was. |
| 54 | // It carries no values: version history replays inputs and recomputes, which |
| 55 | // is slower to restore and the only version that stays honest at scale. |
| 56 | func AppendRecalc(tx *gorm.DB, triggerID uint64, derived int) error { |
| 57 | return tx.Create(&Event{ |
| 58 | Kind: KindRecalc, TriggerID: triggerID, DerivedCount: derived, |
| 59 | }).Error |
| 60 | } |
| 61 | |
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