| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/sha256" |
| 6 | "encoding/json" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "math/rand/v2" |
| 10 | "os" |
| 11 | "path/filepath" |
| 12 | "time" |
| 13 | |
| 14 | "reasonix/desktop/internal/sessionui" |
| 15 | "reasonix/internal/identitylock" |
| 16 | ) |
| 17 | |
| 18 | var errManualCreationIdentity = errors.New("invalid manual creation identity or state") |
| 19 | |
| 20 | func decodeManualCreation(r sessionui.Record) (ManualSessionCreationView, error) { |
| 21 | var v ManualSessionCreationView |
| 22 | if err := json.Unmarshal(r.Payload, &v); err != nil { |
| 23 | return v, err |
| 24 | } |
| 25 | sum := sha256.Sum256([]byte(r.Key)) |
| 26 | if v.OperationID != r.Key || v.WorkspaceID == "" || v.Ref.HostID != localDesktopHostID || |
| 27 | v.Ref.SessionID != fmt.Sprintf("desktop-manual-%x", sum[:16]) || v.TopicID != fmt.Sprintf("manual-%x", sum[:16]) { |
| 28 | return v, errManualCreationIdentity |
| 29 | } |
| 30 | switch v.Phase { |
| 31 | case "reserved", "starting", "ready", "failed": |
| 32 | default: |
| 33 | return v, errManualCreationIdentity |
| 34 | } |
| 35 | return v, nil |
| 36 | } |
| 37 | |
| 38 | func manualCreationBackoff(n int) time.Duration { |
| 39 | base := 500 * time.Millisecond * time.Duration(1<<min(n, 4)) |
| 40 | // Small downward jitter preserves the five-second upper bound. |
| 41 | return min(base, 5*time.Second) * time.Duration(900+rand.IntN(101)) / 1000 |
| 42 | } |
| 43 | |
| 44 | func manualCreationRetryable(err error) bool { |
| 45 | if errors.Is(err, sessionui.ErrConflict) { |
| 46 | return true |
| 47 | } |
| 48 | var sqlErr interface{ Code() int } |
| 49 | if errors.As(err, &sqlErr) { |
| 50 | switch sqlErr.Code() & 255 { |
| 51 | case 5, 6, 10: |
| 52 | return true |
| 53 | } // BUSY, LOCKED, IOERR |
| 54 | } |
| 55 | return false |
| 56 | } |
| 57 | |
| 58 | // Target availability can be retried with the same identity. Result-save retries |
| 59 | // retain the lock and the computed result, never re-entering the runtime builder. |
| 60 | func (m *manualCreationManager) attempt(t *manualCreationTask) (bool, error) { |
| 61 | r, err := m.store.Get(m.ctx, "creation", t.id) |
| 62 | if err != nil { |
| 63 | m.setStage(t, "retrying_storage", "queued") |
| 64 | return manualCreationRetryable(err), err |
| 65 | } |
| 66 | v, err := decodeManualCreation(r) |
| 67 | if err != nil { |
| 68 | return false, err |
| 69 | } |
| 70 | m.mu.Lock() |
| 71 | t.sessionID, t.revision = v.Ref.SessionID, r.Revision |
| 72 | m.mu.Unlock() |
| 73 | if v.Phase == "ready" || (v.Phase == "failed" && !legacyManualCreationConflict(v) && !m.mayRetryFailure(t, r.Revision)) { |
| 74 | return false, nil |
| 75 | } |
| 76 | lockRoot := filepath.Join(filepath.Dir(m.a.sessionUIStore().Path()), "manual-creation-locks") |
| 77 | if err := os.MkdirAll(lockRoot, 0700); err != nil { |
| 78 | return false, err |
| 79 | } |
| 80 | release, err := identitylock.TryAcquire(filepath.Join(lockRoot, v.Ref.SessionID+".lock")) |
| 81 | if errors.Is(err, identitylock.ErrHeld) { |
| 82 | m.setStage(t, "waiting_lock", "waiting_lock") |
| 83 | return true, nil |
| 84 | } |
| 85 | if err != nil { |
| 86 | return false, err |
| 87 | } |
| 88 | defer release() |
| 89 | current, err := m.store.Get(m.ctx, "creation", t.id) |
| 90 | if err != nil { |
| 91 | m.setStage(t, "retrying_storage", "preparing_storage") |
| 92 | return manualCreationRetryable(err), err |
| 93 | } |
| 94 | fresh, err := decodeManualCreation(current) |
| 95 | if err != nil || fresh.Ref != v.Ref || fresh.WorkspaceID != v.WorkspaceID { |
| 96 | return false, errManualCreationIdentity |
| 97 | } |
| 98 | if fresh.Phase == "ready" || (fresh.Phase == "failed" && !legacyManualCreationConflict(fresh) && !m.mayRetryFailure(t, current.Revision)) { |
| 99 | return false, nil |
| 100 | } |
| 101 | if err := m.ctx.Err(); err != nil { |
| 102 | return false, err |
| 103 | } |
| 104 | r, v = current, fresh |
| 105 | r, err = m.savePhase(r, "starting", "") |
| 106 | if err != nil { |
| 107 | m.setStage(t, "retrying_storage", "queued") |
| 108 | return manualCreationRetryable(err), err |
| 109 | } |
| 110 | m.mu.Lock() |
| 111 | t.revision = r.Revision |
| 112 | m.mu.Unlock() |
| 113 | err = m.execute(m.ctx, v, func(stage string) { m.setStage(t, "running", stage) }) |
| 114 | // Shutdown interruption is recoverable on the next start, not a user failure. |
| 115 | if m.ctx.Err() != nil || m.a.shuttingDown.Load() { |
| 116 | return false, context.Canceled |
| 117 | } |
| 118 | var targetErr *SessionOperationError |
| 119 | if errors.As(err, &targetErr) && targetErr.Code == "workspace_unavailable" { |
| 120 | m.setStage(t, "waiting_workspace", "preparing_storage") |
| 121 | return true, nil |
| 122 | } |
| 123 | phase, message := "ready", "" |
| 124 | if err != nil { |
| 125 | phase, message = "failed", sessionOperationErrorForTarget(err, v.Ref.SessionID, v.OperationID).Error() |
| 126 | } |
| 127 | m.setStage(t, "running", "persisting_result") |
| 128 | err = m.persistResult(t, r, v, phase, message) |
| 129 | if err == nil { |
| 130 | m.a.emitProjectTreeChanged() |
| 131 | } |
| 132 | return false, err |
| 133 | } |
| 134 | |
| 135 | func (m *manualCreationManager) savePhase(r sessionui.Record, phase, message string) (sessionui.Record, error) { |
| 136 | var fields map[string]json.RawMessage |
| 137 | if err := json.Unmarshal(r.Payload, &fields); err != nil { |
| 138 | return r, err |
| 139 | } |
| 140 | fields["phase"], _ = json.Marshal(phase) |
| 141 | delete(fields, "error") |
| 142 | if message != "" { |
| 143 | fields["error"], _ = json.Marshal(message) |
| 144 | } |
| 145 | // Only phase/error are replaced; nested and unknown fields stay opaque. |
| 146 | payload, err := json.Marshal(fields) |
| 147 | if err != nil { |
| 148 | return r, err |
| 149 | } |
| 150 | return m.store.Save(m.ctx, "creation", r.Key, r.Revision, payload) |
| 151 | } |
| 152 | |
| 153 | func (m *manualCreationManager) persistResult(t *manualCreationTask, r sessionui.Record, identity ManualSessionCreationView, phase, message string) error { |
| 154 | for n := 0; ; n++ { |
| 155 | if err := m.ctx.Err(); err != nil { |
| 156 | return err |
| 157 | } |
| 158 | saved, err := m.savePhase(r, phase, message) |
| 159 | if err == nil { |
| 160 | m.mu.Lock() |
| 161 | t.revision = saved.Revision |
| 162 | m.mu.Unlock() |
| 163 | return nil |
| 164 | } |
| 165 | if !manualCreationRetryable(err) { |
| 166 | return err |
| 167 | } |
| 168 | m.setStage(t, "retrying_storage", "persisting_result") |
| 169 | if err := m.waitStorageRetry(t, n); err != nil { |
| 170 | return err |
| 171 | } |
| 172 | // Retry reads as well as writes without ever discarding the runtime result. |
| 173 | for { |
| 174 | r, err = m.store.Get(m.ctx, "creation", t.id) |
| 175 | if err == nil { |
| 176 | break |
| 177 | } |
| 178 | if !manualCreationRetryable(err) { |
| 179 | return err |
| 180 | } |
| 181 | if err = m.waitStorageRetry(t, n); err != nil { |
| 182 | return err |
| 183 | } |
| 184 | } |
| 185 | v, err := decodeManualCreation(r) |
| 186 | if err != nil || v.Ref != identity.Ref || v.WorkspaceID != identity.WorkspaceID { |
| 187 | return errManualCreationIdentity |
| 188 | } |
| 189 | if v.Phase == phase { |
| 190 | m.mu.Lock() |
| 191 | t.revision = r.Revision |
| 192 | m.mu.Unlock() |
| 193 | return nil |
| 194 | } |
| 195 | if v.Phase != "starting" { |
| 196 | return errManualCreationIdentity |
| 197 | } |
| 198 | m.mu.Lock() |
| 199 | t.revision = r.Revision |
| 200 | m.mu.Unlock() |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | func (m *manualCreationManager) waitStorageRetry(t *manualCreationTask, n int) error { |
| 205 | delay := manualCreationBackoff(n) |
| 206 | m.mu.Lock() |
| 207 | t.progress.NextRetryAt = m.now().Add(delay).UnixMilli() |
| 208 | m.mu.Unlock() |
| 209 | timer := time.NewTimer(delay) |
| 210 | defer timer.Stop() |
| 211 | select { |
| 212 | case <-m.ctx.Done(): |
| 213 | return m.ctx.Err() |
| 214 | case <-timer.C: |
| 215 | return nil |
| 216 | } |
| 217 | } |
| 218 |