| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | |
| 7 | "reasonix/internal/agent" |
| 8 | "reasonix/internal/control" |
| 9 | ) |
| 10 | |
| 11 | // bindTabWriteAuthority issues a generation-bound write authority from the |
| 12 | // tab's current session lease onto ctrl. Must run after the lease is adopted |
| 13 | // and before the controller is published as Ready/autosave-capable. Missing lease or a |
| 14 | // non-Controller SessionAPI is a no-op (tests and read-only tabs). |
| 15 | func bindTabWriteAuthority(tab *WorkspaceTab, ctrl control.SessionAPI) error { |
| 16 | if tab == nil || ctrl == nil { |
| 17 | return nil |
| 18 | } |
| 19 | c, ok := ctrl.(*control.Controller) |
| 20 | if !ok || c == nil { |
| 21 | return nil |
| 22 | } |
| 23 | tab.sessionLeaseMu.Lock() |
| 24 | lease := tab.sessionLease |
| 25 | tab.sessionLeaseMu.Unlock() |
| 26 | return c.BindSessionWriteAuthority(lease) |
| 27 | } |
| 28 | |
| 29 | // authorizeTabReplacementLocked validates and binds a replacement before it |
| 30 | // is published. App.mu must be held by the caller. |
| 31 | func (a *App) authorizeTabReplacementLocked(tab *WorkspaceTab, ctrl control.SessionAPI, action, authority string) error { |
| 32 | if !a.ownsRuntimeTabLocked(tab) { |
| 33 | return fmt.Errorf("tab %q changed while %s; retry", tab.ID, action) |
| 34 | } |
| 35 | if err := bindTabWriteAuthority(tab, ctrl); err != nil { |
| 36 | return fmt.Errorf("bind %s session authority: %w", authority, err) |
| 37 | } |
| 38 | return nil |
| 39 | } |
| 40 | |
| 41 | func bindCandidateWriteAuthority(ctrl control.SessionAPI, lease *agent.SessionLease) error { |
| 42 | concrete, ok := ctrl.(*control.Controller) |
| 43 | if !ok || concrete == nil { |
| 44 | return nil |
| 45 | } |
| 46 | return control.IssueAndBindWriteAuthority(concrete, lease) |
| 47 | } |
| 48 | |
| 49 | // validateAndBindSessionRebindLocked performs the final identity check and |
| 50 | // authority bind as one publication admission. App.mu must be held. |
| 51 | func (a *App) validateAndBindSessionRebindLocked(tab *WorkspaceTab, source tabRuntimeSnapshot, transition sessionRuntimePathTransition, candidate *sessionRebindCandidate, lease *agent.SessionLease) error { |
| 52 | if tab.removed || |
| 53 | a.tabs[tab.ID] != tab || |
| 54 | tab.Ctrl != source.ctrl || |
| 55 | a.runtimeForTabLocked(tab) != transition.runtime || |
| 56 | !a.sessionRuntimePathTransitionValidLocked(transition) { |
| 57 | return fmt.Errorf("tab runtime changed while switching sessions; retry") |
| 58 | } |
| 59 | if err := bindCandidateWriteAuthority(candidate.ctrl, lease); err != nil { |
| 60 | return fmt.Errorf("resume session: bind write authority: %w", err) |
| 61 | } |
| 62 | return nil |
| 63 | } |
| 64 | |
| 65 | // commitStartupWriteAuthorityLocked commits extension registration and write |
| 66 | // authority under the final publication lock. App.mu must be held on entry; |
| 67 | // failure paths release it and retire the unpublished controller. |
| 68 | func (a *App) commitStartupWriteAuthorityLocked(tab *WorkspaceTab, ctrl control.SessionAPI, registration *sharedHostMCPRegistration, rootKey, acquiredLeaseKey string, appCtx context.Context) bool { |
| 69 | if !registration.commit() { |
| 70 | a.mu.Unlock() |
| 71 | a.abandonSupersededBuild(tab, ctrl, rootKey, acquiredLeaseKey) |
| 72 | a.scheduleDeferredStartupBuild(tab.ID) |
| 73 | return false |
| 74 | } |
| 75 | if err := bindTabWriteAuthority(tab, ctrl); err != nil { |
| 76 | _, save := a.markTabStartupFailureLocked(tab, err, suppressStartupRestore) |
| 77 | a.mu.Unlock() |
| 78 | a.writeTabsSaveRequest(save) |
| 79 | a.abandonSupersededBuild(tab, ctrl, rootKey, acquiredLeaseKey) |
| 80 | a.emitReady(appCtx, tab.ID) |
| 81 | return false |
| 82 | } |
| 83 | return true |
| 84 | } |
| 85 |