| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "time" |
| 6 | |
| 7 | "reasonix/internal/sessioncatalog" |
| 8 | ) |
| 9 | |
| 10 | var ( |
| 11 | errSessionCatalogStopTimeout = errors.New("session catalog did not stop before the rebuild deadline") |
| 12 | errSessionCatalogPanic = errors.New("session catalog rebuild failed unexpectedly") |
| 13 | ) |
| 14 | |
| 15 | type sessionCatalogRebuildFlight struct { |
| 16 | done chan struct{} |
| 17 | err error |
| 18 | } |
| 19 | |
| 20 | // RebuildSessionCatalog owns the bounded, one-shot rebuild transaction. The |
| 21 | // replacement watcher is always an ordinary watcher and never owns rebuilding. |
| 22 | func (a *App) RebuildSessionCatalog() error { |
| 23 | return a.rebuildSessionCatalog(5 * time.Second) |
| 24 | } |
| 25 | |
| 26 | func (a *App) rebuildSessionCatalog(stopTimeout time.Duration) (err error) { |
| 27 | if a == nil || a.shuttingDown.Load() { |
| 28 | return errors.New("application is shutting down") |
| 29 | } |
| 30 | a.catalogRebuildMu.Lock() |
| 31 | if flight := a.catalogRebuild; flight != nil { |
| 32 | a.catalogRebuildMu.Unlock() |
| 33 | if a.catalogRebuildJoinHook != nil { |
| 34 | a.catalogRebuildJoinHook() |
| 35 | } |
| 36 | <-flight.done |
| 37 | return flight.err |
| 38 | } |
| 39 | flight := &sessionCatalogRebuildFlight{done: make(chan struct{})} |
| 40 | a.catalogRebuild = flight |
| 41 | a.catalogRebuilding.Store(true) |
| 42 | a.catalogRebuildMu.Unlock() |
| 43 | |
| 44 | defer func() { |
| 45 | panicValue := recover() |
| 46 | if panicValue != nil { |
| 47 | flight.err = errSessionCatalogPanic |
| 48 | } else { |
| 49 | flight.err = err |
| 50 | } |
| 51 | a.catalogRebuildMu.Lock() |
| 52 | a.catalogRebuild = nil |
| 53 | close(flight.done) |
| 54 | a.catalogRebuildMu.Unlock() |
| 55 | if panicValue != nil { |
| 56 | panic(panicValue) |
| 57 | } |
| 58 | }() |
| 59 | err = a.runSessionCatalogRebuild(stopTimeout) |
| 60 | return err |
| 61 | } |
| 62 | |
| 63 | func (a *App) runSessionCatalogRebuild(stopTimeout time.Duration) error { |
| 64 | status := a.currentSessionCatalogStatus() |
| 65 | finishedRevision := status.Revision |
| 66 | defer func() { |
| 67 | if !a.shuttingDown.Load() { |
| 68 | // Arm the ordinary watcher before releasing the single-flight gate so |
| 69 | // another Wails rebuild cannot enter the stop/start handoff gap. |
| 70 | a.startSessionCatalog() |
| 71 | } |
| 72 | a.catalogRebuilding.Store(false) |
| 73 | if !a.shuttingDown.Load() { |
| 74 | a.emitProjectTreeChangedV2(finishedRevision, nil, "catalog_rebuild_finished") |
| 75 | } |
| 76 | }() |
| 77 | a.emitProjectTreeChangedV2(status.Revision, nil, "catalog_rebuild_started") |
| 78 | |
| 79 | // Rebuild must not race the old SQLite handle on Windows, where publishing |
| 80 | // the atomic replacement can fail while that handle is still closing. |
| 81 | if !a.stopSessionCatalog(stopTimeout) { |
| 82 | return errSessionCatalogStopTimeout |
| 83 | } |
| 84 | replacement, err := sessioncatalog.RebuildWithRevisionFloor( |
| 85 | a.bootContext(), sessioncatalog.DefaultPath(), a.sessionCatalogTargets(), status.Revision, |
| 86 | ) |
| 87 | if err == nil { |
| 88 | finishedRevision = max(finishedRevision, replacement.Revision) |
| 89 | } |
| 90 | return err |
| 91 | } |
| 92 |