| 1 | package hostbox |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/sha256" |
| 6 | "encoding/hex" |
| 7 | "encoding/json" |
| 8 | "github.com/carlosframework/platform/internal/hostguard" |
| 9 | "math" |
| 10 | "slices" |
| 11 | ) |
| 12 | |
| 13 | type ProducerCompletion struct { |
| 14 | Count uint64 |
| 15 | Digest string |
| 16 | } |
| 17 | |
| 18 | func (c ProducerCompletion) Valid() bool { |
| 19 | if c.Count == 0 { |
| 20 | return c.Digest == "" |
| 21 | } |
| 22 | b, err := hex.DecodeString(c.Digest) |
| 23 | return err == nil && len(b) == sha256.Size |
| 24 | } |
| 25 | |
| 26 | // CompleteProducer atomically removes a joined producer and extends its durable |
| 27 | // completion chain. The previous value permits replay after a lost commit reply. |
| 28 | func (j *LaunchJournal) CompleteProducer(ctx context.Context, t hostguard.FenceTarget, id string, previous ProducerCompletion) (ProducerCompletion, error) { |
| 29 | if j == nil { |
| 30 | return previous, ErrUnsupported |
| 31 | } |
| 32 | if j.remote != nil { |
| 33 | out, err := journalCall(ctx, j.remote, JournalRequest{Op: "complete", Target: t, Producer: id, Previous: previous}) |
| 34 | return out.Completion, err |
| 35 | } |
| 36 | |
| 37 | if !component(id) || !previous.Valid() || previous.Count == math.MaxUint64 { |
| 38 | return previous, ErrTypedInventory |
| 39 | } |
| 40 | raw, _ := json.Marshal(struct { |
| 41 | Previous ProducerCompletion |
| 42 | ID string |
| 43 | }{previous, id}) |
| 44 | digest := sha256.Sum256(raw) |
| 45 | next := ProducerCompletion{Count: previous.Count + 1, Digest: hex.EncodeToString(digest[:])} |
| 46 | err := j.mutate(ctx, t, func(in *LaunchInventory) error { |
| 47 | i := slices.Index(in.ProducerIDs, id) |
| 48 | if i < 0 && in.Completed == next { |
| 49 | return nil |
| 50 | } |
| 51 | if i < 0 || in.Completed != previous { |
| 52 | return ErrChanged |
| 53 | } |
| 54 | in.ProducerIDs = slices.Delete(in.ProducerIDs, i, i+1) |
| 55 | in.Completed = next |
| 56 | return nil |
| 57 | }) |
| 58 | if err != nil { |
| 59 | return previous, err |
| 60 | } |
| 61 | return next, nil |
| 62 | } |
| 63 | |
| 64 | func (j *LaunchJournal) RecordProducer(ctx context.Context, t hostguard.FenceTarget, id string) error { |
| 65 | if j == nil { |
| 66 | return ErrUnsupported |
| 67 | } |
| 68 | if j.remote != nil { |
| 69 | out, err := journalCall(ctx, j.remote, JournalRequest{Op: "producer", Target: t, Producer: id}) |
| 70 | _ = out |
| 71 | return err |
| 72 | } |
| 73 | |
| 74 | if !component(id) { |
| 75 | return ErrTypedInventory |
| 76 | } |
| 77 | return j.mutate(ctx, t, func(in *LaunchInventory) error { |
| 78 | for _, old := range in.ProducerIDs { |
| 79 | if old == id { |
| 80 | return ErrTypedInventory |
| 81 | } |
| 82 | } |
| 83 | in.ProducerIDs = append(in.ProducerIDs, id) |
| 84 | return nil |
| 85 | }) |
| 86 | } |
| 87 | |
amadan