feat: gateway: OpenRPC support

api/api_gateway.go

@@ -66,4 +66,5 @@ type Gateway interface {
 	StateWaitMsg(ctx context.Context, cid cid.Cid, confidence uint64, limit abi.ChainEpoch, allowReplaced bool) (*MsgLookup, error)
 	WalletBalance(context.Context, address.Address) (types.BigInt, error)
 	Version(context.Context) (APIVersion, error)
+	Discover(context.Context) (apitypes.OpenRPCDocument, error)
 }

api/docgen/docgen.go

@@ -350,6 +350,10 @@ func GetAPIType(name, pkg string) (i interface{}, t reflect.Type, permStruct []r
 			i = &api.WorkerStruct{}
 			t = reflect.TypeOf(new(struct{ api.Worker })).Elem()
 			permStruct = append(permStruct, reflect.TypeOf(api.WorkerStruct{}.Internal))
+		case "Gateway":
+			i = &api.GatewayStruct{}
+			t = reflect.TypeOf(new(struct{ api.Gateway })).Elem()
+			permStruct = append(permStruct, reflect.TypeOf(api.GatewayStruct{}.Internal))
 		default:
 			panic("unknown type")
 		}

api/proxy_gen.go

@@ -512,6 +512,8 @@ type GatewayStruct struct {
 
 		ChainReadObj func(p0 context.Context, p1 cid.Cid) ([]byte, error) ``
 
+		Discover func(p0 context.Context) (apitypes.OpenRPCDocument, error) ``
+
 		GasEstimateMessageGas func(p0 context.Context, p1 *types.Message, p2 *MessageSendSpec, p3 types.TipSetKey) (*types.Message, error) ``
 
 		MpoolPush func(p0 context.Context, p1 *types.SignedMessage) (cid.Cid, error) ``
@@ -3299,6 +3301,17 @@ func (s *GatewayStub) ChainReadObj(p0 context.Context, p1 cid.Cid) ([]byte, erro
 	return *new([]byte), ErrNotSupported
 }
 
+func (s *GatewayStruct) Discover(p0 context.Context) (apitypes.OpenRPCDocument, error) {
+	if s.Internal.Discover == nil {
+		return *new(apitypes.OpenRPCDocument), ErrNotSupported
+	}
+	return s.Internal.Discover(p0)
+}
+
+func (s *GatewayStub) Discover(p0 context.Context) (apitypes.OpenRPCDocument, error) {
+	return *new(apitypes.OpenRPCDocument), ErrNotSupported
+}
+
 func (s *GatewayStruct) GasEstimateMessageGas(p0 context.Context, p1 *types.Message, p2 *MessageSendSpec, p3 types.TipSetKey) (*types.Message, error) {
 	if s.Internal.GasEstimateMessageGas == nil {
 		return nil, ErrNotSupported