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import ( "context" "database/sql" "errors" "fmt" "log/slog" "math/rand/v2" "os" "path/filepath" "strings" "time"
"tangled.org/core/knotserver/config" "tangled.org/core/knotserver/db" "tangled.org/core/knotserver/repodid" "tangled.org/core/notifier" "tangled.org/core/rbac")
type legacyRepo struct { ownerDid string repoName string oldPath string}
func scanLegacyRepos(scanPath string, logger *slog.Logger) []legacyRepo { topEntries, err := os.ReadDir(scanPath) if err != nil { logger.Error("reading scan path", "error", err) return nil }
var repos []legacyRepo for _, entry := range topEntries { if !entry.IsDir() || !strings.HasPrefix(entry.Name(), "did:") { continue }
ownerPath := filepath.Join(scanPath, entry.Name())
if _, headErr := os.Stat(filepath.Join(ownerPath, "HEAD")); headErr == nil { continue }
subEntries, readErr := os.ReadDir(ownerPath) if readErr != nil { logger.Error("reading owner dir", "ownerDir", ownerPath, "error", readErr) continue }
ownerDid := entry.Name() for _, sub := range subEntries { if !sub.IsDir() { continue } subPath := filepath.Join(ownerPath, sub.Name()) if _, statErr := os.Stat(filepath.Join(subPath, "HEAD")); statErr != nil { logger.Warn("skipping non-repo directory", "path", subPath) continue } repos = append(repos, legacyRepo{ ownerDid: ownerDid, repoName: sub.Name(), oldPath: subPath, }) } } return repos}
func migrateReposOnStartup(ctx context.Context, c *config.Config, d *db.DB, e *rbac.Enforcer, n *notifier.Notifier, logger *slog.Logger) bool { repos := scanLegacyRepos(c.Repo.ScanPath, logger) if len(repos) == 0 { logger.Info("no legacy repos found, migration complete") return true }
logger.Info("starting legacy repo migration", "count", len(repos)) start := time.Now()
knotServiceUrl := "https://" + c.Server.Hostname if c.Server.Dev { knotServiceUrl = "http://" + c.Server.Hostname }
migrated := 0 for _, repo := range repos { select { case <-ctx.Done(): logger.Info("migration interrupted by shutdown", "migrated", migrated, "remaining", len(repos)-migrated) return false default: }
err := migrateOneRepo(ctx, c, d, e, n, logger, repo, knotServiceUrl) if err != nil { logger.Error("migration failed for repo", "owner", repo.ownerDid, "repo", repo.repoName, "error", err) continue } migrated++ }
logger.Info("legacy repo migration complete", "migrated", migrated, "total", len(repos), "duration", time.Since(start)) return migrated == len(repos)}
func migrateOneRepo( ctx context.Context, c *config.Config, d *db.DB, e *rbac.Enforcer, n *notifier.Notifier, logger *slog.Logger, repo legacyRepo, knotServiceUrl string,) error { l := logger.With("owner", repo.ownerDid, "repo", repo.repoName)
repoDid, err := d.GetRepoDid(repo.ownerDid, repo.repoName) needsMint := errors.Is(err, sql.ErrNoRows) if err != nil && !needsMint { return fmt.Errorf("checking repo_keys: %w", err) }
if needsMint { repoDid, err = mintAndStoreRepoDID(ctx, c, d, l, repo, knotServiceUrl) if err != nil { return err } }
if err := rewriteRBACPolicies(e, repo.ownerDid, repo.repoName, repoDid, l); err != nil { return fmt.Errorf("rewriting RBAC policies: %w", err) }
newPath := filepath.Join(c.Repo.ScanPath, repoDid)
if err := moveRepoOnDisk(repo.oldPath, newPath, l); err != nil { return err }
ownerDir := filepath.Dir(repo.oldPath) if err := os.Remove(ownerDir); err != nil && !errors.Is(err, os.ErrNotExist) { l.Warn("could not remove empty owner dir", "path", ownerDir, "error", err) }
if err := d.EmitDIDAssign(n, repo.ownerDid, repo.repoName, repoDid); err != nil { l.Error("emitting didAssign event failed (non-fatal)", "error", err) }
l.Info("migrated repo", "repoDid", repoDid) return nil}
func mintAndStoreRepoDID( ctx context.Context, c *config.Config, d *db.DB, l *slog.Logger, repo legacyRepo, knotServiceUrl string,) (string, error) { prepared, err := repodid.PrepareRepoDID(c.Server.PlcUrl, knotServiceUrl) if err != nil { return "", fmt.Errorf("preparing DID: %w", err) }
if err := submitWithBackoff(ctx, prepared, l); err != nil { return "", fmt.Errorf("PLC submission: %w", err) }
if err := d.StoreRepoKey(prepared.RepoDid, prepared.SigningKeyRaw, repo.ownerDid, repo.repoName); err != nil { return "", fmt.Errorf("storing repo key: %w", err) }
return prepared.RepoDid, nil}
func submitWithBackoff(ctx context.Context, prepared *repodid.PreparedDID, l *slog.Logger) error { backoff := 2 * time.Second const maxBackoff = 5 * time.Minute const maxAttempts = 20
for attempt := range maxAttempts { plcCtx, cancel := context.WithTimeout(ctx, 30*time.Second) err := prepared.Submit(plcCtx) cancel()
if err == nil { return nil }
errMsg := err.Error() retryable := strings.Contains(errMsg, "429") || strings.Contains(errMsg, "500") || strings.Contains(errMsg, "502") || strings.Contains(errMsg, "503") || strings.Contains(errMsg, "504")
if !retryable || attempt == maxAttempts-1 { return err }
jitter := time.Duration(rand.Int64N(int64(backoff / 4))) delay := backoff + jitter
l.Info("PLC rate limited, backing off", "delay", delay, "attempt", attempt+1)
select { case <-ctx.Done(): return ctx.Err() case <-time.After(delay): }
backoff = min(backoff*2, maxBackoff) }
return fmt.Errorf("unreachable: exceeded max attempts")}
func moveRepoOnDisk(oldPath, newPath string, l *slog.Logger) error { if _, err := os.Stat(newPath); err == nil { l.Info("new path already exists, skipping rename", "newPath", newPath) return nil }
if _, err := os.Stat(oldPath); errors.Is(err, os.ErrNotExist) { return fmt.Errorf("old path %s does not exist and new path %s not found", oldPath, newPath) }
if err := os.Rename(oldPath, newPath); err != nil { return fmt.Errorf("renaming %s -> %s: %w", oldPath, newPath, err) }
return nil}
func rewriteRBACPolicies(e *rbac.Enforcer, ownerDid, repoName, repoDid string, l *slog.Logger) error { oldResource := ownerDid + "/" + repoName
policies, err := e.E.GetFilteredPolicy(1, rbac.ThisServer, oldResource) if err != nil { return fmt.Errorf("getting old policies: %w", err) }
var addPolicies [][]string var removePolicies [][]string for _, p := range policies { removePolicies = append(removePolicies, p) newPolicy := make([]string, len(p)) copy(newPolicy, p) newPolicy[2] = repoDid addPolicies = append(addPolicies, newPolicy) }
if len(addPolicies) > 0 { if _, addErr := e.E.AddPolicies(addPolicies); addErr != nil { return fmt.Errorf("adding new policies: %w", addErr) } }
if len(removePolicies) > 0 { if _, rmErr := e.E.RemovePolicies(removePolicies); rmErr != nil { return fmt.Errorf("removing old policies: %w", rmErr) } }
l.Info("rewrote RBAC policies", "old", oldResource, "new", repoDid, "count", len(policies)) return nil}