feat:add Allegra protocol parameters support

Signed-off-by: Ales Verbic <verbotenj@blinklabs.io>

ledger/allegra.go

@@ -114,6 +114,11 @@ func (h *AllegraBlockHeader) Era() Era {
 
 type AllegraTransactionBody struct {
 	ShelleyTransactionBody
+	Update struct {
+		cbor.StructAsArray
+		ProtocolParamUpdates map[Blake2b224]AllegraProtocolParameterUpdate
+		Epoch                uint64
+	} `cbor:"6,keyasint,omitempty"`
 	ValidityIntervalStart uint64 `cbor:"8,keyasint,omitempty"`
 }
 
@@ -191,6 +196,14 @@ func (t *AllegraTransaction) Cbor() []byte {
 	return cborData
 }
 
+type AllegraProtocolParameters struct {
+	ShelleyProtocolParameters
+}
+
+type AllegraProtocolParameterUpdate struct {
+	ShelleyProtocolParameterUpdate
+}
+
 func NewAllegraBlockFromCbor(data []byte) (*AllegraBlock, error) {
 	var allegraBlock AllegraBlock
 	if _, err := cbor.Decode(data, &allegraBlock); err != nil {

protocol/localstatequery/client.go

@@ -354,6 +354,12 @@ func (c *Client) GetCurrentProtocolParams() (CurrentProtocolParamsResult, error)
 			return nil, err
 		}
 		return result[0], nil
+	case ledger.EraIdAllegra:
+		result := []ledger.AllegraProtocolParameters{}
+		if err := c.runQuery(query, &result); err != nil {
+			return nil, err
+		}
+		return result[0], nil
 	case ledger.EraIdShelley:
 		result := []ledger.ShelleyProtocolParameters{}
 		if err := c.runQuery(query, &result); err != nil {