| 1 | package plans |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "encoding/json" |
| 6 | "errors" |
| 7 | "fmt" |
| 8 | "os" |
| 9 | "time" |
| 10 | |
| 11 | "github.com/carlosframework/platform/internal/release" |
| 12 | ) |
| 13 | |
| 14 | // MarkerSchema is the deployment marker's wire version. |
| 15 | const MarkerSchema = 1 |
| 16 | |
| 17 | // Marker says whether plans are on for the deployment (plans 2). The console |
| 18 | // writes it once at start; boxes read it on every pass and read no limits |
| 19 | // record while it is absent or disabled, so a deployment without a catalog |
| 20 | // costs a box one small read per pass and changes nothing. |
| 21 | type Marker struct { |
| 22 | Schema int `json:"schema"` |
| 23 | Enabled bool `json:"enabled"` |
| 24 | CatalogID string `json:"catalog_id,omitempty"` |
| 25 | UpdatedAt time.Time `json:"updated_at"` |
| 26 | } |
| 27 | |
| 28 | // MarkerKey is where the deployment marker lives. |
| 29 | func MarkerKey() string { return "control/plans.json" } |
| 30 | |
| 31 | // GetMarker reads the marker and its etag. Absent is nil, "", nil. An unknown |
| 32 | // schema is an error, so a reader keeps whatever it last knew. |
| 33 | func GetMarker(ctx context.Context, s release.Store) (*Marker, string, error) { |
| 34 | raw, etag, err := s.Get(ctx, MarkerKey()) |
| 35 | if err != nil { |
| 36 | if errors.Is(err, os.ErrNotExist) { |
| 37 | return nil, "", nil |
| 38 | } |
| 39 | return nil, "", err |
| 40 | } |
| 41 | var m Marker |
| 42 | if err := json.Unmarshal(raw, &m); err != nil { |
| 43 | return nil, "", fmt.Errorf("plans: %s: %w", MarkerKey(), err) |
| 44 | } |
| 45 | if m.Schema != MarkerSchema { |
| 46 | return nil, "", fmt.Errorf("plans: %s: schema %d, want %d", MarkerKey(), m.Schema, MarkerSchema) |
| 47 | } |
| 48 | return &m, etag, nil |
| 49 | } |
| 50 | |
| 51 | // PutMarker CAS-writes the marker: ifMatch "" is create-only, otherwise |
| 52 | // replace-only. Schema is stamped here. |
| 53 | func PutMarker(ctx context.Context, s release.Store, m *Marker, ifMatch string) (string, error) { |
| 54 | m.Schema = MarkerSchema |
| 55 | body, err := json.MarshalIndent(m, "", " ") |
| 56 | if err != nil { |
| 57 | return "", err |
| 58 | } |
| 59 | return s.Put(ctx, MarkerKey(), append(body, '\n'), ifMatch) |
| 60 | } |
| 61 | |
amadan