| 1 | package rootparticipation |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "os" |
| 7 | "sync" |
| 8 | |
| 9 | "github.com/carlosframework/platform/internal/hostwrite" |
| 10 | |
| 11 | "github.com/carlosframework/platform/internal/rootstate" |
| 12 | ) |
| 13 | |
| 14 | var launchVerifier struct { |
| 15 | sync.RWMutex |
| 16 | verify func(context.Context, uint64) error |
| 17 | exclude func(context.Context, func(context.Context) error) error |
| 18 | } |
| 19 | |
| 20 | // RegisterLaunchVerifier binds E2's root reservation and kernel census reader. |
| 21 | // It runs under participation exclusion and must not call the agent or broker. |
| 22 | func RegisterLaunchVerifier(verify func(context.Context, uint64) error, exclude func(context.Context, func(context.Context) error) error) error { |
| 23 | launchVerifier.Lock() |
| 24 | defer launchVerifier.Unlock() |
| 25 | if verify == nil || exclude == nil || launchVerifier.verify != nil { |
| 26 | return ErrUnavailable |
| 27 | } |
| 28 | launchVerifier.verify = verify |
| 29 | launchVerifier.exclude = exclude |
| 30 | return nil |
| 31 | } |
| 32 | |
| 33 | func Open() (Ledger, error) { |
| 34 | state, err := rootstate.Open(Namespace, false, false) |
| 35 | if err != nil { |
| 36 | return Ledger{}, err |
| 37 | } |
| 38 | launchVerifier.RLock() |
| 39 | verify, exclude := launchVerifier.verify, launchVerifier.exclude |
| 40 | launchVerifier.RUnlock() |
| 41 | return Ledger{State: state, VerifyLaunches: verify, ExcludeLaunches: exclude}, nil |
| 42 | } |
| 43 | |
| 44 | func VerifyLaunchCensus(ctx context.Context, revision uint64) error { |
| 45 | launchVerifier.RLock() |
| 46 | verify := launchVerifier.verify |
| 47 | launchVerifier.RUnlock() |
| 48 | if verify == nil { |
| 49 | return ErrUnavailable |
| 50 | } |
| 51 | return verify(ctx, revision) |
| 52 | } |
| 53 | |
| 54 | // UpdateRequired keeps a retained census authoritative after claims are disabled. |
| 55 | // Only an absent census with the flag off selects the legacy update protocol. |
| 56 | func (l Ledger) UpdateRequired() (bool, error) { |
| 57 | if hostwrite.Enabled(os.Getenv) { |
| 58 | return true, nil |
| 59 | } |
| 60 | if l.State == nil { |
| 61 | return false, ErrUnavailable |
| 62 | } |
| 63 | _, err := l.State.Read("census.json") |
| 64 | if errors.Is(err, os.ErrNotExist) { |
| 65 | return false, nil |
| 66 | } |
| 67 | return true, err |
| 68 | } |
| 69 | |
| 70 | func OpenForUpdate() (Ledger, bool, error) { |
| 71 | l, err := Open() |
| 72 | if errors.Is(err, os.ErrNotExist) { |
| 73 | return Ledger{}, false, nil |
| 74 | } |
| 75 | if err != nil { |
| 76 | return Ledger{}, false, err |
| 77 | } |
| 78 | _, err = l.State.Read("census.json") |
| 79 | if errors.Is(err, os.ErrNotExist) { |
| 80 | l.State.Close() |
| 81 | return Ledger{}, false, nil |
| 82 | } |
| 83 | required, err := l.UpdateRequired() |
| 84 | if err != nil { |
| 85 | l.State.Close() |
| 86 | return Ledger{}, false, err |
| 87 | } |
| 88 | return l, required, nil |
| 89 | } |
| 90 | |
| 91 | func (l Ledger) ActivationReady(ctx context.Context) error { |
| 92 | c, err := l.Census() |
| 93 | if err != nil { |
| 94 | return err |
| 95 | } |
| 96 | if l.VerifyLaunches == nil { |
| 97 | return ErrUnavailable |
| 98 | } |
| 99 | return l.VerifyLaunches(ctx, c.LaunchRevision) |
| 100 | } |
| 101 | |
| 102 | func WithLaunchExclusion(ctx context.Context, fn func(context.Context) error) error { |
| 103 | launchVerifier.RLock() |
| 104 | exclude := launchVerifier.exclude |
| 105 | launchVerifier.RUnlock() |
| 106 | if exclude == nil { |
| 107 | return ErrUnavailable |
| 108 | } |
| 109 | return exclude(ctx, fn) |
| 110 | } |
| 111 | |
| 112 | func (l Ledger) WithLaunchExclusion(ctx context.Context, fn func(context.Context) error) error { |
| 113 | if l.ExcludeLaunches == nil { |
| 114 | return ErrUnavailable |
| 115 | } |
| 116 | return l.ExcludeLaunches(ctx, fn) |
| 117 | } |
| 118 | |
amadan