Read the kinds a module's membership names

go/seat.go

@@ -83,6 +83,40 @@ func SeatRecord(bucket, key string) (*StateEntry, error) {
 	return &e, json.Unmarshal(raw, &e)
 }
 
+// KindHeld is one kind of a kinded bench and who holds it, with what it promises (novox/hq ADR 0259 §5).
+type KindHeld struct {
+	Seat         string   `json:"seat"`
+	Kind         string   `json:"kind"`
+	Module       string   `json:"module"`
+	Node         string   `json:"node"`
+	Capabilities []string `json:"capabilities,omitempty"`
+}
+
+// Promises says whether this kind's claim declares a capability.
+func (k KindHeld) Promises(capability string) bool {
+	for _, c := range k.Capabilities {
+		if c == capability {
+			return true
+		}
+	}
+	return false
+}
+
+// SeatKinds is every kind of the kinded benches this module uses or watches, as the controller issued
+// them in its membership: the one account of which channel is which, never a channel's own word.
+func SeatKinds() ([]KindHeld, error) {
+	c, err := live()
+	if err != nil {
+		return nil, err
+	}
+	raw, err := c.ask("mesh/seat.kinds", map[string]any{}, seatTimeout)
+	if err != nil {
+		return nil, err
+	}
+	var out []KindHeld
+	return out, json.Unmarshal(raw, &out)
+}
+
 // Create writes a key only when it has none, and returns the revision; a key that has one is refused.
 func (s KeptState) Create(key string, value any) (uint64, error) {
 	return s.revisionOf(s.ask("create", map[string]any{"key": key, "value": value}))