| 1 | package hostops |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/ed25519" |
| 6 | "encoding/json" |
| 7 | "io" |
| 8 | "time" |
| 9 | |
| 10 | "github.com/carlosframework/platform/internal/hostclaim" |
| 11 | "github.com/carlosframework/platform/internal/provision" |
| 12 | "github.com/carlosframework/platform/internal/release" |
| 13 | ) |
| 14 | |
| 15 | type effectPermitKey struct{} |
| 16 | type effectPermit struct{ Resource string } |
| 17 | |
| 18 | // conditionalRecordStore enforces D7's record-shape protocol beneath the |
| 19 | // mutation boundary: provisioning records are created only inside their own |
| 20 | // issued record effect; every other write replaces an existing exact ETag |
| 21 | // and preserves identity. Authority (which app, which permit) is the |
| 22 | // boundary's job, not this layer's. Named private fields; no embedding. |
| 23 | type conditionalRecordStore struct { |
| 24 | homeRegion string |
| 25 | raw release.Store |
| 26 | pub ed25519.PublicKey |
| 27 | } |
| 28 | |
| 29 | var ( |
| 30 | _ release.Store = conditionalRecordStore{} |
| 31 | _ release.ConditionalDeleter = conditionalRecordStore{} |
| 32 | _ release.Opener = conditionalRecordStore{} |
| 33 | _ release.ModLister = conditionalRecordStore{} |
| 34 | _ release.SizeLister = conditionalRecordStore{} |
| 35 | _ release.PageLister = conditionalRecordStore{} |
| 36 | _ release.ConditionalGetter = conditionalRecordStore{} |
| 37 | _ release.ETagLister = conditionalRecordStore{} |
| 38 | _ release.BucketListDirs = conditionalRecordStore{} |
| 39 | ) |
| 40 | |
| 41 | func NewConditionalRecordStore(raw release.Store, pub ed25519.PublicKey, homeRegion ...string) (release.Store, error) { |
| 42 | if raw == nil || len(pub) != ed25519.PublicKeySize { |
| 43 | return nil, ErrContract |
| 44 | } |
| 45 | home, err := consoleHomeRegion(homeRegion) |
| 46 | if err != nil { |
| 47 | return nil, err |
| 48 | } |
| 49 | return conditionalRecordStore{raw: raw, pub: pub, homeRegion: home}, nil |
| 50 | } |
| 51 | |
| 52 | func provisioningKey(key string) bool { |
| 53 | return provision.IsRecordKey(key) |
| 54 | } |
| 55 | |
| 56 | func (s conditionalRecordStore) Get(ctx context.Context, key string) ([]byte, string, error) { |
| 57 | return s.raw.Get(ctx, key) |
| 58 | } |
| 59 | func (s conditionalRecordStore) List(ctx context.Context, prefix string) ([]string, error) { |
| 60 | return s.raw.List(ctx, prefix) |
| 61 | } |
| 62 | func (s conditionalRecordStore) ListDirs(ctx context.Context, prefix string) ([]string, error) { |
| 63 | return s.raw.ListDirs(ctx, prefix) |
| 64 | } |
| 65 | func (s conditionalRecordStore) BucketShapedListDirs() bool { return release.HasBucketListDirs(s.raw) } |
| 66 | func (s conditionalRecordStore) Open(ctx context.Context, key string) (io.ReadCloser, string, error) { |
| 67 | return release.OpenObject(ctx, s.raw, key) |
| 68 | } |
| 69 | func (s conditionalRecordStore) ListMod(ctx context.Context, prefix string) ([]release.KeyMod, error) { |
| 70 | if l, ok := s.raw.(release.ModLister); ok { |
| 71 | return l.ListMod(ctx, prefix) |
| 72 | } |
| 73 | return nil, ErrContract |
| 74 | } |
| 75 | func (s conditionalRecordStore) ListSizes(ctx context.Context, prefix string) ([]release.KeySize, error) { |
| 76 | if l, ok := s.raw.(release.SizeLister); ok { |
| 77 | return l.ListSizes(ctx, prefix) |
| 78 | } |
| 79 | return nil, ErrContract |
| 80 | } |
| 81 | func (s conditionalRecordStore) ListPage(ctx context.Context, prefix, startAfter string, limit int) ([]string, error) { |
| 82 | if l, ok := s.raw.(release.PageLister); ok { |
| 83 | return l.ListPage(ctx, prefix, startAfter, limit) |
| 84 | } |
| 85 | return nil, ErrContract |
| 86 | } |
| 87 | |
| 88 | func (s conditionalRecordStore) GetIfChanged(ctx context.Context, key, etag string) ([]byte, string, bool, error) { |
| 89 | if g, ok := s.raw.(release.ConditionalGetter); ok { |
| 90 | return g.GetIfChanged(ctx, key, etag) |
| 91 | } |
| 92 | return nil, "", false, ErrContract |
| 93 | } |
| 94 | func (s conditionalRecordStore) ListETags(ctx context.Context, prefix string) ([]release.KeyETag, error) { |
| 95 | if l, ok := s.raw.(release.ETagLister); ok { |
| 96 | return l.ListETags(ctx, prefix) |
| 97 | } |
| 98 | return nil, ErrContract |
| 99 | } |
| 100 | |
| 101 | func (s conditionalRecordStore) Put(ctx context.Context, key string, body []byte, etag string) (string, error) { |
| 102 | if !provisioningKey(key) { |
| 103 | return s.raw.Put(ctx, key, body, etag) |
| 104 | } |
| 105 | if err := CheckCreateFreeze(ctx, s.raw, s.pub); err != nil { |
| 106 | return "", err |
| 107 | } |
| 108 | // Rev 3 operation-bound lifecycle record writer (lifecycle_record.go). |
| 109 | if permit, ok := ctx.Value(lifecycleRecordKey{}).(lifecycleRecordPermit); ok { |
| 110 | return s.putLifecycle(ctx, key, body, etag, permit) |
| 111 | } |
| 112 | if permit, ok := ctx.Value(effectPermitKey{}).(effectPermit); ok && (permit.Resource == key || permit.Resource == "control-object:"+key) { |
| 113 | return putSequencedRecord(ctx, s.raw, key, body, etag) |
| 114 | } |
| 115 | // Not-found is never turned into create outside the record effect. |
| 116 | if etag == "" { |
| 117 | return "", ErrContract |
| 118 | } |
| 119 | current, err := ReadRecord(ctx, s.raw, key) |
| 120 | if err != nil { |
| 121 | return "", err |
| 122 | } |
| 123 | if current.ETag != etag { |
| 124 | return "", release.ErrCASConflict |
| 125 | } |
| 126 | // Move journal fields change only through the lifecycle writer above. |
| 127 | if !sameMoveJournal(current.Body, body) { |
| 128 | return "", ErrContract |
| 129 | } |
| 130 | var next struct { |
| 131 | Account string `json:"account"` |
| 132 | App string `json:"app"` |
| 133 | Host string `json:"host"` |
| 134 | Name string `json:"name"` |
| 135 | Acquisition string `json:"acq"` |
| 136 | Region string `json:"region"` |
| 137 | CreatedAt time.Time `json:"created_at"` |
| 138 | } |
| 139 | if json.Unmarshal(body, &next) != nil { |
| 140 | return "", ErrIdentity |
| 141 | } |
| 142 | n := current.Holder |
| 143 | if next.Account != n.Account || next.App != n.App || next.Host != n.Host || next.Name != n.Name || next.Acquisition != n.Acquisition || next.Region != n.RecordRegion || !next.CreatedAt.Equal(n.CreatedAt) { |
| 144 | return "", ErrIdentity |
| 145 | } |
| 146 | obs, err := hostclaim.Read(ctx, s.raw, n.Host) |
| 147 | if err != nil { |
| 148 | return "", err |
| 149 | } |
| 150 | if obs.Absent || obs.Claim.Op.Kind != hostclaim.KindServing || !matches(current, obs.Claim.Holder) { |
| 151 | return "", ErrPending |
| 152 | } |
| 153 | return putSequencedRecord(ctx, s.raw, key, body, etag) |
| 154 | } |
| 155 | |
| 156 | func (s conditionalRecordStore) Delete(ctx context.Context, key string) error { |
| 157 | if provisioningKey(key) { |
| 158 | return ErrContract |
| 159 | } |
| 160 | return s.raw.Delete(ctx, key) |
| 161 | } |
| 162 | |
| 163 | func (s conditionalRecordStore) DeleteIfMatch(ctx context.Context, key, etag string) error { |
| 164 | return release.DeleteIfMatch(ctx, s.raw, key, etag) |
| 165 | } |
| 166 | |
amadan