| 1 | package hostguard |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "os" |
| 6 | "path/filepath" |
| 7 | "strings" |
| 8 | ) |
| 9 | |
| 10 | func (g Guard) PendingFences(ctx context.Context) ([]FenceTarget, error) { |
| 11 | return g.pendingFences(ctx, true) |
| 12 | } |
| 13 | |
| 14 | func (g Guard) PendingStopFences(ctx context.Context) ([]FenceTarget, error) { |
| 15 | return g.pendingFences(ctx, false) |
| 16 | } |
| 17 | |
| 18 | func (g Guard) pendingFences(ctx context.Context, handovers bool) ([]FenceTarget, error) { |
| 19 | if g.FenceView != nil { |
| 20 | return nil, ErrUnsupported |
| 21 | } |
| 22 | names, err := g.recordNames() |
| 23 | if err != nil { |
| 24 | return nil, err |
| 25 | } |
| 26 | var out []FenceTarget |
| 27 | for _, name := range names { |
| 28 | if !strings.HasSuffix(name, ".json") { |
| 29 | continue |
| 30 | } |
| 31 | host := strings.TrimSuffix(name, ".json") |
| 32 | err := g.readLocked(ctx, host, func(d *recordDir) error { |
| 33 | r, err := d.read(host) |
| 34 | if err != nil { |
| 35 | return err |
| 36 | } |
| 37 | if r.ActiveFence == nil || (!handovers && r.root && r.barrier != nil && *r.barrier == *r.ActiveFence) { |
| 38 | return nil |
| 39 | } |
| 40 | for _, receipt := range r.FenceJournal { |
| 41 | if receipt.Target == *r.ActiveFence { |
| 42 | return nil |
| 43 | } |
| 44 | } |
| 45 | out = append(out, *r.ActiveFence) |
| 46 | return nil |
| 47 | }) |
| 48 | if err != nil { |
| 49 | return nil, err |
| 50 | } |
| 51 | } |
| 52 | return out, nil |
| 53 | } |
| 54 | func (g Guard) ResumeFence(ctx context.Context, target FenceTarget) error { |
| 55 | return g.fenceLocked(ctx, target.Host, Captured{Incarnation: target.Incarnation, Stamp: target.Stamp}, func(d *recordDir) error { |
| 56 | r, err := d.read(target.Host) |
| 57 | if err != nil { |
| 58 | return err |
| 59 | } |
| 60 | if r.ActiveFence == nil || *r.ActiveFence != target { |
| 61 | return ErrFenceTarget |
| 62 | } |
| 63 | return nil |
| 64 | }) |
| 65 | } |
| 66 | |
| 67 | func (g Guard) ExistingFence(ctx context.Context, want FenceTarget) (FenceTarget, error) { |
| 68 | var found FenceTarget |
| 69 | err := g.fenceLocked(ctx, want.Host, Captured{Incarnation: want.Incarnation, Stamp: want.Stamp}, func(d *recordDir) error { |
| 70 | r, err := d.read(want.Host) |
| 71 | if err != nil { |
| 72 | return err |
| 73 | } |
| 74 | if r.ActiveFence == nil || !r.ActiveFence.sameAuthority(want) { |
| 75 | return ErrFenceTarget |
| 76 | } |
| 77 | found = *r.ActiveFence |
| 78 | return nil |
| 79 | }) |
| 80 | return found, err |
| 81 | } |
| 82 | |
| 83 | func (g Guard) recordNames() ([]string, error) { |
| 84 | if g.Root != nil { |
| 85 | return g.Root.store.Names() |
| 86 | } |
| 87 | entries, err := os.ReadDir(filepath.Join(g.DataDir, "hostguard")) |
| 88 | if err != nil { |
| 89 | return nil, err |
| 90 | } |
| 91 | var names []string |
| 92 | for _, entry := range entries { |
| 93 | if !entry.IsDir() { |
| 94 | names = append(names, entry.Name()) |
| 95 | } |
| 96 | } |
| 97 | return names, nil |
| 98 | } |
| 99 | |
amadan