| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/sha256" |
| 6 | "encoding/hex" |
| 7 | "encoding/json" |
| 8 | "errors" |
| 9 | "fmt" |
| 10 | "os" |
| 11 | "path/filepath" |
| 12 | "sort" |
| 13 | |
| 14 | "reasonix/internal/store" |
| 15 | ) |
| 16 | |
| 17 | // Migration may add members to an existing workspace, but it does not own the |
| 18 | // user's title or visibility. Avoid rewriting presentation for each new source. |
| 19 | func (a *App) ensureDesktopMigrationWorkspace(ctx context.Context, source desktopMigrationSource) (string, error) { |
| 20 | state, err := a.workspaceRegistry().Load(ctx) |
| 21 | if err != nil { |
| 22 | return "", err |
| 23 | } |
| 24 | id := desktopWorkspaceOwnerID(state, source.scope, source.workspaceRoot) |
| 25 | if _, exists := state.Workspaces[id]; exists { |
| 26 | return id, nil |
| 27 | } |
| 28 | return a.ensureDesktopWorkspace(ctx, source.scope, source.workspaceRoot) |
| 29 | } |
| 30 | |
| 31 | // A completed ledger entry records adoption of a source, not equality with |
| 32 | // today's target. The target can be continued, archived or deliberately deleted. |
| 33 | // None of those actions authorize importing the old conversation again. |
| 34 | type desktopMigrationCheckpoint struct { |
| 35 | key string |
| 36 | files []string |
| 37 | revision string |
| 38 | record desktopMigrationRecord |
| 39 | refresh bool |
| 40 | inputDigest string |
| 41 | } |
| 42 | |
| 43 | type desktopMigrationReceipt struct { |
| 44 | extra map[string]json.RawMessage |
| 45 | TargetSessionID string `json:"targetSessionId"` |
| 46 | ContentDigest string `json:"contentDigest,omitempty"` |
| 47 | SourceRevision string `json:"sourceRevision,omitempty"` |
| 48 | } |
| 49 | |
| 50 | func newDesktopMigrationCheckpoint(source desktopMigrationSource, key string, files []string) (desktopMigrationCheckpoint, error) { |
| 51 | records := source.records |
| 52 | if records == nil { |
| 53 | ledger, err := readDesktopMigrationLedger() |
| 54 | if err != nil { |
| 55 | return desktopMigrationCheckpoint{}, err |
| 56 | } |
| 57 | records = ledger.Records |
| 58 | } |
| 59 | revision, err := desktopMigrationSourceRevision(files) |
| 60 | if err != nil { |
| 61 | return desktopMigrationCheckpoint{}, errors.Join(err, updateDesktopMigrationLedger(key, records[key].TargetSessionID, "failed", "source_stat")) |
| 62 | } |
| 63 | record := records[key] |
| 64 | refresh := record.Status != "completed" && record.PreviousCompletion != nil |
| 65 | if refresh { |
| 66 | previous := record.PreviousCompletion |
| 67 | record.Status, record.TargetSessionID = "completed", previous.TargetSessionID |
| 68 | record.ContentDigest, record.SourceRevision = previous.ContentDigest, previous.SourceRevision |
| 69 | } |
| 70 | checkpoint := desktopMigrationCheckpoint{key: key, files: files, revision: revision, record: record, refresh: refresh} |
| 71 | if !checkpoint.unchanged() { |
| 72 | checkpoint.inputDigest, err = desktopMigrationInputDigest(files) |
| 73 | if err != nil { |
| 74 | return desktopMigrationCheckpoint{}, err |
| 75 | } |
| 76 | } |
| 77 | return checkpoint, nil |
| 78 | } |
| 79 | |
| 80 | func (c desktopMigrationCheckpoint) completed() bool { |
| 81 | return c.record.Status == "completed" && c.record.TargetSessionID != "" |
| 82 | } |
| 83 | |
| 84 | func (c desktopMigrationCheckpoint) unchanged() bool { |
| 85 | return c.completed() && c.record.SourceRevision == c.revision |
| 86 | } |
| 87 | |
| 88 | func (c desktopMigrationCheckpoint) skip() error { |
| 89 | if c.refresh { |
| 90 | return c.complete(c.record.TargetSessionID, c.record.ContentDigest) |
| 91 | } |
| 92 | return nil |
| 93 | } |
| 94 | |
| 95 | // Old ledgers have no source revision. Compare their recorded source digest |
| 96 | // once, without comparing to a target that may already contain newer work. |
| 97 | func (c desktopMigrationCheckpoint) matchesCompletedContent(digest string) bool { |
| 98 | return c.completed() && digest != "" && c.record.ContentDigest == digest |
| 99 | } |
| 100 | |
| 101 | func (c desktopMigrationCheckpoint) complete(targetID, digest string) error { |
| 102 | revision, err := c.verifiedRevision() |
| 103 | if err != nil { |
| 104 | return errors.Join(err, updateDesktopMigrationLedger(c.key, targetID, "failed", "source_changed", digest)) |
| 105 | } |
| 106 | return updateDesktopMigrationLedger(c.key, targetID, "completed", "", digest, revision) |
| 107 | } |
| 108 | |
| 109 | func (c desktopMigrationCheckpoint) verify() error { |
| 110 | _, err := c.verifiedRevision() |
| 111 | return err |
| 112 | } |
| 113 | |
| 114 | func (c desktopMigrationCheckpoint) verifiedRevision() (string, error) { |
| 115 | revision, err := desktopMigrationSourceRevision(c.files) |
| 116 | if err == nil && revision != c.revision && c.inputDigest != "" { |
| 117 | // A catalog repair can rewrite identical JSONL bytes and refresh only |
| 118 | // derived listing fields. Verify the frozen input, not inode/mtime alone. |
| 119 | current, digestErr := desktopMigrationInputDigest(c.files) |
| 120 | if digestErr == nil && current == c.inputDigest { |
| 121 | c.revision = revision |
| 122 | } |
| 123 | err = digestErr |
| 124 | } |
| 125 | if err != nil || revision != c.revision { |
| 126 | return "", errors.Join(errors.New("desktop migration source changed during import"), err) |
| 127 | } |
| 128 | return revision, nil |
| 129 | } |
| 130 | |
| 131 | func canonicalMigrationSourceFiles(root, sessionID string) []string { |
| 132 | dir := filepath.Join(root, sessionID) |
| 133 | // Content blobs are immutable and referenced by the event log. Disposable |
| 134 | // indexes, checkpoints and lock files do not change the migration input. |
| 135 | return []string{filepath.Join(dir, "manifest.json"), filepath.Join(dir, "events.frames"), |
| 136 | filepath.Join(dir, "events.jsonl"), filepath.Join(dir, "header.json")} |
| 137 | } |
| 138 | |
| 139 | func desktopCanonicalMigrationKey(root, sessionID string) string { |
| 140 | digest := sha256.Sum256([]byte(canonicalRuntimeRoot(root) + "\x00" + sessionID)) |
| 141 | return hex.EncodeToString(digest[:]) |
| 142 | } |
| 143 | |
| 144 | func legacyMigrationSourceFiles(path string) []string { |
| 145 | // Catalog reads may rebuild disposable indexes while an import is frozen. |
| 146 | // Their publication is not a change to the legacy conversation. Keep all |
| 147 | // durable sidecars (including ancestry/ownership metadata) in the stamp. |
| 148 | files := []string{path} |
| 149 | for _, sidecar := range store.SessionSidecarFiles(path) { |
| 150 | if sidecar == store.SessionEventIndex(path) || sidecar == store.SessionDisplayIndex(path) || sidecar == store.SessionTranscriptProjection(path) { |
| 151 | continue |
| 152 | } |
| 153 | files = append(files, sidecar) |
| 154 | } |
| 155 | return files |
| 156 | } |
| 157 | |
| 158 | func desktopLegacyMigrationKey(path string) string { |
| 159 | digest := sha256.Sum256([]byte(canonicalRuntimeRoot(path))) |
| 160 | return hex.EncodeToString(digest[:]) |
| 161 | } |
| 162 | |
| 163 | // This is a cheap filesystem revision, not a content integrity checksum. |
| 164 | // Normal source writes change size or mtime; no history bodies are read here. |
| 165 | // Include absent files so creation/removal of a sidecar invalidates the stamp. |
| 166 | func desktopMigrationSourceRevision(files []string) (string, error) { |
| 167 | paths := append([]string(nil), files...) |
| 168 | sort.Strings(paths) |
| 169 | hash := sha256.New() |
| 170 | for _, path := range paths { |
| 171 | info, err := os.Stat(path) |
| 172 | if os.IsNotExist(err) { |
| 173 | fmt.Fprintf(hash, "%q:missing\n", path) |
| 174 | continue |
| 175 | } |
| 176 | if err != nil { |
| 177 | return "", err |
| 178 | } |
| 179 | fmt.Fprintf(hash, "%q:%d:%d:%d\n", path, info.Mode(), info.Size(), info.ModTime().UnixNano()) |
| 180 | } |
| 181 | return "stat-v1-" + hex.EncodeToString(hash.Sum(nil)), nil |
| 182 | } |
| 183 | |
| 184 | func readDesktopMigrationLedger() (desktopMigrationLedger, error) { |
| 185 | desktopMigrationMu.Lock() |
| 186 | defer desktopMigrationMu.Unlock() |
| 187 | ledger, _, err := readDesktopMigrationLedgerFile() |
| 188 | return ledger, err |
| 189 | } |
| 190 | |
| 191 | // Callers serialize reads and atomic replacement with desktopMigrationMu. |
| 192 | func readDesktopMigrationLedgerFile() (desktopMigrationLedger, []byte, error) { |
| 193 | ledger := desktopMigrationLedger{Version: 1, Records: map[string]desktopMigrationRecord{}} |
| 194 | body, err := os.ReadFile(desktopMigrationLedgerPath()) |
| 195 | if os.IsNotExist(err) { |
| 196 | return ledger, nil, nil |
| 197 | } |
| 198 | if err != nil { |
| 199 | return ledger, nil, err |
| 200 | } |
| 201 | if err := json.Unmarshal(body, &ledger); err != nil { |
| 202 | return ledger, nil, err |
| 203 | } |
| 204 | if ledger.Version > 1 { |
| 205 | return ledger, nil, fmt.Errorf("desktop migration ledger version %d is unsupported", ledger.Version) |
| 206 | } |
| 207 | if ledger.Records == nil { |
| 208 | ledger.Records = map[string]desktopMigrationRecord{} |
| 209 | } |
| 210 | return ledger, body, nil |
| 211 | } |
| 212 | |
| 213 | // Preserve unknown root/record fields when adding an optional revision to a v1 |
| 214 | // ledger. Older writers can drop the revision; the digest fallback remains safe. |
| 215 | func marshalDesktopMigrationRecord(original []byte, ledger desktopMigrationLedger, key string) ([]byte, error) { |
| 216 | root := map[string]json.RawMessage{} |
| 217 | if len(original) > 0 { |
| 218 | if err := json.Unmarshal(original, &root); err != nil { |
| 219 | return nil, err |
| 220 | } |
| 221 | } |
| 222 | if root == nil { |
| 223 | root = map[string]json.RawMessage{} |
| 224 | } |
| 225 | records := map[string]map[string]json.RawMessage{} |
| 226 | if body := root["records"]; len(body) > 0 { |
| 227 | if err := json.Unmarshal(body, &records); err != nil { |
| 228 | return nil, err |
| 229 | } |
| 230 | } |
| 231 | if records == nil { |
| 232 | records = map[string]map[string]json.RawMessage{} |
| 233 | } |
| 234 | fields := records[key] |
| 235 | if fields == nil { |
| 236 | fields = map[string]json.RawMessage{} |
| 237 | } |
| 238 | for _, name := range []string{"sourceKey", "targetSessionId", "contentDigest", "sourceRevision", "previousCompletion", "status", "errorCode", "attempts", "legacyHeads", "legacySelectedHead", "legacyPrimaryHead", "legacyHeadsRevision", "legacyAdoption", "legacyConversions"} { |
| 239 | delete(fields, name) |
| 240 | } |
| 241 | body, err := json.Marshal(ledger.Records[key]) |
| 242 | if err != nil { |
| 243 | return nil, err |
| 244 | } |
| 245 | if err := json.Unmarshal(body, &fields); err != nil { |
| 246 | return nil, err |
| 247 | } |
| 248 | records[key] = fields |
| 249 | root["records"], err = json.Marshal(records) |
| 250 | if err != nil { |
| 251 | return nil, err |
| 252 | } |
| 253 | root["version"], err = json.Marshal(ledger.Version) |
| 254 | if err != nil { |
| 255 | return nil, err |
| 256 | } |
| 257 | return json.MarshalIndent(root, "", " ") |
| 258 | } |
| 259 |