| 1 | package hostguard |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "github.com/carlosframework/platform/internal/hostclaim" |
| 7 | ) |
| 8 | |
| 9 | func (g Guard) RetireInstallationWith(ctx context.Context, host string, captured Captured, check func(*hostclaim.Claim) error, fn func() error) error { |
| 10 | return g.retireInstallationWith(ctx, host, captured, check, fn, nil) |
| 11 | } |
| 12 | |
| 13 | // persist is injected by package tests to interrupt the record's durable write. |
| 14 | func (g Guard) retireInstallationWith(ctx context.Context, host string, captured Captured, check func(*hostclaim.Claim) error, fn func() error, persist func(*recordDir, record) error) error { |
| 15 | if captured.Stamp == 0 || check == nil || fn == nil { |
| 16 | return ErrInvalidInput |
| 17 | } |
| 18 | return g.locked(ctx, host, func(d *recordDir) error { |
| 19 | c, err := g.fresh(ctx, host) |
| 20 | if err != nil { |
| 21 | return err |
| 22 | } |
| 23 | if c.Holder.Incarnation != captured.Incarnation { |
| 24 | return ErrClaimIncarnation |
| 25 | } |
| 26 | if err := check(c); err != nil { |
| 27 | return err |
| 28 | } |
| 29 | r, err := d.read(host) |
| 30 | if err != nil { |
| 31 | return err |
| 32 | } |
| 33 | if r.Incarnation != captured.Incarnation { |
| 34 | return ErrRecordIncarnation |
| 35 | } |
| 36 | if r.ActiveStamp != 0 { |
| 37 | if r.ActiveStamp != captured.Stamp { |
| 38 | return ErrStampMismatch |
| 39 | } |
| 40 | r.retire() |
| 41 | if persist == nil { |
| 42 | persist = (*recordDir).write |
| 43 | } |
| 44 | } else { |
| 45 | n := len(r.RetiredStamps) |
| 46 | if n == 0 || r.RetiredStamps[n-1] != captured.Stamp { |
| 47 | return ErrStampMismatch |
| 48 | } |
| 49 | if persist == nil { |
| 50 | persist = func(d *recordDir, _ record) error { return d.sync(host) } |
| 51 | } |
| 52 | } |
| 53 | if err := ctx.Err(); err != nil { |
| 54 | return err |
| 55 | } |
| 56 | // An inactive record can be visible after rename without being durable. |
| 57 | // Sync it on retries before the callback may move any artifact. |
| 58 | if err := persist(d, r); err != nil { |
| 59 | return err |
| 60 | } |
| 61 | if err := ctx.Err(); err != nil { |
| 62 | return err |
| 63 | } |
| 64 | return fn() |
| 65 | }) |
| 66 | } |
| 67 | |
| 68 | func (g Guard) WithNoInstallation(ctx context.Context, host, incarnation string, check func(*hostclaim.Claim) error, fn func() error) error { |
| 69 | if incarnation == "" || check == nil || fn == nil { |
| 70 | return ErrInvalidInput |
| 71 | } |
| 72 | return g.locked(ctx, host, func(d *recordDir) error { |
| 73 | c, err := g.fresh(ctx, host) |
| 74 | if err != nil { |
| 75 | return err |
| 76 | } |
| 77 | if c.Holder.Incarnation != incarnation { |
| 78 | return ErrClaimIncarnation |
| 79 | } |
| 80 | if err := check(c); err != nil { |
| 81 | return err |
| 82 | } |
| 83 | if g.Root != nil { |
| 84 | captured := Captured{Incarnation: incarnation, Stamp: c.Holder.Stamp} |
| 85 | view, err := g.Root.viewLocked(host, captured) |
| 86 | if err != nil { |
| 87 | return err |
| 88 | } |
| 89 | if err = view.admit(host, captured, c.Holder.Session); err != nil { |
| 90 | return err |
| 91 | } |
| 92 | if !view.Installation.Empty || view.Installation.Account != c.Holder.Account || view.Installation.App != c.Holder.App { |
| 93 | return ErrStampMismatch |
| 94 | } |
| 95 | return fn() |
| 96 | } |
| 97 | _, err = d.read(host) |
| 98 | if !errors.Is(err, ErrNoRecord) { |
| 99 | if err != nil { |
| 100 | return err |
| 101 | } |
| 102 | return ErrStampMismatch |
| 103 | } |
| 104 | if err := ctx.Err(); err != nil { |
| 105 | return err |
| 106 | } |
| 107 | return fn() |
| 108 | }) |
| 109 | } |
| 110 | |
amadan