| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "reflect" |
| 6 | "strconv" |
| 7 | |
| 8 | "github.com/carlosframework/platform/internal/hostbox" |
| 9 | "github.com/carlosframework/platform/internal/hostclaim" |
| 10 | "github.com/carlosframework/platform/internal/hostguard" |
| 11 | ) |
| 12 | |
| 13 | func (h claimCrossBoxHandover) installRecoveryRemote(ctx context.Context, prior, admitted hostclaim.Observed) error { |
| 14 | if h.RecoveryRebind == nil || h.Inventory == nil || h.Guard.FenceView == nil { |
| 15 | return hostbox.ErrUnsupported |
| 16 | } |
| 17 | actor, err := h.Identity.Verify(ctx) |
| 18 | if err != nil { |
| 19 | return err |
| 20 | } |
| 21 | stamp, err := strconv.ParseUint(prior.Claim.Op.Journal[hostclaim.JournalSourceStamp], 10, 64) |
| 22 | if err != nil || stamp == 0 { |
| 23 | return hostbox.ErrChanged |
| 24 | } |
| 25 | next := admitted.Claim.Holder |
| 26 | captured := hostguard.Captured{Incarnation: next.Incarnation, Stamp: stamp} |
| 27 | successor := hostguard.Captured{Incarnation: next.Incarnation, Stamp: next.Stamp} |
| 28 | for attempt := 0; attempt < 3; attempt++ { |
| 29 | source, revision, err := h.Inventory.Snapshot(ctx, prior.Host, captured) |
| 30 | if err != nil { |
| 31 | return err |
| 32 | } |
| 33 | var q recoveryRebindRequest |
| 34 | err = h.Guard.WithLocal(ctx, prior.Host, func() error { |
| 35 | fresh, err := hostclaim.Read(ctx, h.Evidence, prior.Host) |
| 36 | if err != nil { |
| 37 | return err |
| 38 | } |
| 39 | if fresh.ETag != admitted.ETag || !hostclaim.SameWriterIdentity(fresh, admitted) { |
| 40 | return hostbox.ErrChanged |
| 41 | } |
| 42 | view, err := h.Guard.FenceView(ctx, prior.Host, captured) |
| 43 | if err != nil { |
| 44 | return err |
| 45 | } |
| 46 | if view.Installation.Stamp != stamp && view.Installation.Stamp != next.Stamp || view.Installation.Stamp == stamp && view.Installation.InventoryRevision != revision { |
| 47 | return hostbox.ErrChanged |
| 48 | } |
| 49 | _, etag, err := rootClaimRecord(ctx, h.Evidence, fresh.Claim, h.Guard.DataDir) |
| 50 | if err != nil { |
| 51 | return err |
| 52 | } |
| 53 | q = recoveryRebindRequest{V: 1, Prior: captured, Revision: revision, RecordKey: next.Key, RecordETag: etag, Next: hostbox.ColdSuccessor{Host: admitted.Host, Incarnation: next.Incarnation, Stamp: next.Stamp, Session: next.Session, Generation: next.Generation, Box: actor.Box, Enrollment: actor.Enrollment, DirectoryRevision: actor.Binding, ETag: admitted.ETag, Op: admitted.Claim.Op.ID, Phase: admitted.Claim.Op.Phase}} |
| 54 | return nil |
| 55 | }) |
| 56 | if err != nil { |
| 57 | return err |
| 58 | } |
| 59 | if err = h.RecoveryRebind(ctx, q); err != nil { |
| 60 | return err |
| 61 | } |
| 62 | if err = h.Guard.Activate(ctx, admitted.Host, h.Box, nil); err != nil { |
| 63 | return err |
| 64 | } |
| 65 | current, rev, err := h.Inventory.Snapshot(ctx, prior.Host, successor) |
| 66 | if err != nil { |
| 67 | return err |
| 68 | } |
| 69 | err = h.Guard.With(ctx, prior.Host, successor, func(c *hostclaim.Claim) error { |
| 70 | if !hostclaim.SameWriterIdentity(admitted, hostclaim.Observed{Host: admitted.Host, Claim: c}) { |
| 71 | return hostbox.ErrChanged |
| 72 | } |
| 73 | return nil |
| 74 | }, func() error { |
| 75 | fresh, err := hostclaim.Read(ctx, h.Evidence, prior.Host) |
| 76 | if err != nil { |
| 77 | return err |
| 78 | } |
| 79 | if fresh.ETag != admitted.ETag || !hostclaim.SameWriterIdentity(fresh, admitted) { |
| 80 | return hostbox.ErrChanged |
| 81 | } |
| 82 | view, err := h.Guard.FenceView(ctx, prior.Host, successor) |
| 83 | if err != nil { |
| 84 | return err |
| 85 | } |
| 86 | if view.Installation.Stamp != next.Stamp || view.Installation.Incarnation != next.Incarnation || view.Installation.InventoryRevision != rev || rev != 1 || !reflect.DeepEqual(current, recoveryInventory(source, q.Next)) { |
| 87 | return hostbox.ErrChanged |
| 88 | } |
| 89 | _, etag, err := rootClaimRecord(ctx, h.Evidence, fresh.Claim, h.Guard.DataDir) |
| 90 | if err != nil { |
| 91 | return err |
| 92 | } |
| 93 | if etag != q.RecordETag { |
| 94 | return hostbox.ErrChanged |
| 95 | } |
| 96 | source.InstallationStamp = next.Stamp |
| 97 | owner := "" |
| 98 | for _, e := range current.Entries { |
| 99 | if e.Kind == "route" { |
| 100 | owner = e.Ownership |
| 101 | } |
| 102 | } |
| 103 | if owner == "" { |
| 104 | return hostbox.ErrTypedInventory |
| 105 | } |
| 106 | return h.rebindRecoveryRows(ctx, &source, stamp, owner) |
| 107 | }) |
| 108 | if err == hostbox.ErrChanged { |
| 109 | continue |
| 110 | } |
| 111 | if err != nil { |
| 112 | return err |
| 113 | } |
| 114 | return nil |
| 115 | } |
| 116 | return hostbox.ErrChanged |
| 117 | } |
| 118 | |
amadan