| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "fmt" |
| 7 | "net/http" |
| 8 | |
| 9 | "reasonix/internal/config" |
| 10 | ) |
| 11 | |
| 12 | type credentialProxyOwnership struct { |
| 13 | config.ModelSettingsOwnership |
| 14 | pending map[string]string |
| 15 | latest remoteModelSettingsStatus |
| 16 | } |
| 17 | |
| 18 | func (a *App) installRemoteModelSettingsSnapshot(ctx context.Context, client *http.Client, base, host, workspace, path, ref string, bundle *config.ModelRuntimeSettings, prior remoteModelSettingsStatus) (remoteModelSettingsStatus, error) { |
| 19 | if !a.reserveCredentialProxyInstall(host, workspace, bundle.OfferID, bundle.Revision, prior.OwnershipIncarnation) { |
| 20 | a.finishCredentialProxyOffer(host, workspace, bundle.OfferID) |
| 21 | return prior, fmt.Errorf("remote ownership changed while preparing model settings") |
| 22 | } |
| 23 | status, err := applyRemoteModelSettingsSnapshot(ctx, client, base, path, ref, bundle, prior) |
| 24 | if err != nil { |
| 25 | if status.OwnershipIncarnation == prior.OwnershipIncarnation && status.OwnershipSeq > prior.OwnershipSeq { |
| 26 | prior = status |
| 27 | } |
| 28 | var rejected *remoteModelSettingsRejection |
| 29 | if errors.As(err, &rejected) { |
| 30 | a.reconcileCredentialProxyGenerations(host, workspace, prior, bundle.OfferID) |
| 31 | } else { |
| 32 | a.reconcileCredentialProxyGenerations(host, workspace, prior) |
| 33 | } |
| 34 | return status, err |
| 35 | } |
| 36 | a.reconcileCredentialProxyGenerations(host, workspace, status, bundle.OfferID) |
| 37 | return status, nil |
| 38 | } |
| 39 | |
| 40 | func (a *App) reserveCredentialProxyInstall(host, workspace, offer, revision, incarnation string) bool { |
| 41 | a.credProxyMu.Lock() |
| 42 | p := a.credProxy |
| 43 | a.credProxyMu.Unlock() |
| 44 | if p == nil { |
| 45 | return false |
| 46 | } |
| 47 | p.mu.Lock() |
| 48 | defer p.mu.Unlock() |
| 49 | if owner := p.ownership[credentialProxyScope(host, workspace)]; owner != nil && owner.OwnershipIncarnation == incarnation { |
| 50 | if owner.pending == nil { |
| 51 | owner.pending = map[string]string{} |
| 52 | } |
| 53 | owner.pending[offer] = revision |
| 54 | return true |
| 55 | } |
| 56 | return false |
| 57 | } |
| 58 | |
| 59 | func (m *desktopRemoteManager) pinModelSettingsOwnership(app *App, host, workspace string, managed *managedHost, status remoteModelSettingsStatus) bool { |
| 60 | // No route-lock holder calls into the manager. Keep identity validation and |
| 61 | // pin together so a replaced connection cannot restore an old incarnation. |
| 62 | m.mu.Lock() |
| 63 | defer m.mu.Unlock() |
| 64 | return m.hosts[host] == managed && app.pinCredentialProxyOwnership(host, workspace, status) |
| 65 | } |
| 66 | |
| 67 | // Only the authenticated GET performed under the current managed connection's |
| 68 | // serve gate may establish a Serve incarnation. Source calls cannot replace it. |
| 69 | func (a *App) pinCredentialProxyOwnership(host, workspace string, status remoteModelSettingsStatus) bool { |
| 70 | if status.OwnershipIncarnation == "" || status.OwnershipSeq == 0 { |
| 71 | return false |
| 72 | } |
| 73 | a.credProxyMu.Lock() |
| 74 | p := a.credProxy |
| 75 | a.credProxyMu.Unlock() |
| 76 | if p == nil { |
| 77 | return false |
| 78 | } |
| 79 | p.updateMu.Lock() |
| 80 | defer p.updateMu.Unlock() |
| 81 | p.mu.Lock() |
| 82 | defer p.mu.Unlock() |
| 83 | if p.ownership == nil { |
| 84 | p.ownership = map[string]*credentialProxyOwnership{} |
| 85 | } |
| 86 | scope := credentialProxyScope(host, workspace) |
| 87 | if old := p.ownership[scope]; old == nil || old.OwnershipIncarnation != status.OwnershipIncarnation { |
| 88 | // A new Serve cannot own an unfinished build in the previous process. |
| 89 | // Preserve routes until its full receipt is reconciled, but release all |
| 90 | // old-process reservations. Late builders recheck incarnation below. |
| 91 | if old != nil { |
| 92 | for _, route := range p.routes { |
| 93 | if route.scope == scope { |
| 94 | clear(route.holds) |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | p.ownership[scope] = &credentialProxyOwnership{ModelSettingsOwnership: config.ModelSettingsOwnership{OwnershipIncarnation: status.OwnershipIncarnation}} |
| 99 | } |
| 100 | return true |
| 101 | } |
| 102 | |
| 103 | // Retirement, receipt ordering, and offer release share one route transaction. |
| 104 | // An accepted HTTP request retains its route until it returns. An uncertain |
| 105 | // install retains its hold until a receipt positively identifies that revision. |
| 106 | func (a *App) reconcileCredentialProxyGenerations(host, workspace string, status remoteModelSettingsStatus, offers ...string) bool { |
| 107 | if status.Version != 1 { |
| 108 | return false |
| 109 | } |
| 110 | a.credProxyMu.Lock() |
| 111 | p := a.credProxy |
| 112 | a.credProxyMu.Unlock() |
| 113 | if p == nil { |
| 114 | return false |
| 115 | } |
| 116 | p.updateMu.Lock() |
| 117 | defer p.updateMu.Unlock() |
| 118 | p.mu.Lock() |
| 119 | defer p.mu.Unlock() |
| 120 | scope := credentialProxyScope(host, workspace) |
| 121 | authority := p.ownership[scope] |
| 122 | if authority == nil || authority.OwnershipIncarnation != status.OwnershipIncarnation { |
| 123 | return false |
| 124 | } |
| 125 | accepted := status.OwnershipSeq > authority.OwnershipSeq |
| 126 | if accepted { |
| 127 | authority.OwnershipSeq = status.OwnershipSeq |
| 128 | authority.latest = status |
| 129 | authority.latest.OwnedRevisions = append([]string(nil), status.OwnedRevisions...) |
| 130 | } else { |
| 131 | // A confirmed older install may release its own reservation, but only |
| 132 | // the newest complete ownership snapshot may drive retirement. |
| 133 | if len(offers) == 0 { |
| 134 | return false |
| 135 | } |
| 136 | status = authority.latest |
| 137 | } |
| 138 | owned := map[string]bool{} |
| 139 | for _, revision := range status.OwnedRevisions { |
| 140 | owned[revision] = true |
| 141 | } |
| 142 | for offer, revision := range authority.pending { |
| 143 | if owned[revision] { |
| 144 | offers = append(offers, offer) |
| 145 | } |
| 146 | } |
| 147 | for _, offer := range offers { |
| 148 | delete(authority.pending, offer) |
| 149 | } |
| 150 | for token, route := range p.routes { |
| 151 | if route.scope != scope { |
| 152 | continue |
| 153 | } |
| 154 | for _, offer := range offers { |
| 155 | delete(route.holds, offer) |
| 156 | } |
| 157 | if status.UnversionedOwners || owned[route.revision] || len(route.holds) > 0 { |
| 158 | continue |
| 159 | } |
| 160 | route.retired = true |
| 161 | if route.active == 0 { |
| 162 | delete(p.routes, token) |
| 163 | } |
| 164 | } |
| 165 | return accepted |
| 166 | } |
| 167 |