bring back proto & return error on query

proto/cosmos/base/reflection/v2alpha1/reflection.proto

@@ -15,12 +15,12 @@ message AppDescriptor {
   ChainDescriptor chain = 2;
   // codec provides metadata information regarding codec related types
   CodecDescriptor codec = 3;
+  // configuration provides metadata information regarding the sdk.Config type
+  ConfigurationDescriptor configuration = 4;
   // query_services provides metadata information regarding the available queryable endpoints
   QueryServicesDescriptor query_services = 5;
   // tx provides metadata information regarding how to send transactions to the given application
   TxDescriptor tx = 6;
-
-  reserved 4;
 }
 
 // TxDescriptor describes the accepted transaction type
@@ -99,6 +99,12 @@ message InterfaceAcceptingMessageDescriptor {
   repeated string field_descriptor_names = 2;
 }
 
+// ConfigurationDescriptor contains metadata information on the sdk.Config
+message ConfigurationDescriptor {
+  // bech32_account_address_prefix is the account address prefix
+  string bech32_account_address_prefix = 1;
+}
+
 // MsgDescriptor describes a cosmos-sdk message that can be delivered with a transaction
 message MsgDescriptor {
   // msg_type_url contains the TypeURL of a sdk.Msg.
@@ -121,6 +127,10 @@ service ReflectionService {
   rpc GetCodecDescriptor(GetCodecDescriptorRequest) returns (GetCodecDescriptorResponse) {
     option (google.api.http).get = "/cosmos/base/reflection/v1beta1/app_descriptor/codec";
   }
+  // GetConfigurationDescriptor returns the descriptor for the sdk.Config of the application
+  rpc GetConfigurationDescriptor(GetConfigurationDescriptorRequest) returns (GetConfigurationDescriptorResponse) {
+    option (google.api.http).get = "/cosmos/base/reflection/v1beta1/app_descriptor/configuration";
+  }
   // GetQueryServicesDescriptor returns the available gRPC queryable services of the application
   rpc GetQueryServicesDescriptor(GetQueryServicesDescriptorRequest) returns (GetQueryServicesDescriptorResponse) {
     option (google.api.http).get = "/cosmos/base/reflection/v1beta1/app_descriptor/query_services";
@@ -155,6 +165,14 @@ message GetCodecDescriptorResponse {
   CodecDescriptor codec = 1;
 }
 
+// GetConfigurationDescriptorRequest is the request used for the GetConfigurationDescriptor RPC
+message GetConfigurationDescriptorRequest {}
+// GetConfigurationDescriptorResponse is the response returned by the GetConfigurationDescriptor RPC
+message GetConfigurationDescriptorResponse {
+  // config describes the application's sdk.Config
+  ConfigurationDescriptor config = 1;
+}
+
 // GetQueryServicesDescriptorRequest is the request used for the GetQueryServicesDescriptor RPC
 message GetQueryServicesDescriptorRequest {}
 // GetQueryServicesDescriptorResponse is the response returned by the GetQueryServicesDescriptor RPC

server/grpc/reflection/v2alpha1/reflection.go

@@ -2,6 +2,7 @@ package v2alpha1
 
 import (
 	"context"
+	"errors"
 	"fmt"
 
 	"github.com/cosmos/gogoproto/proto"
@@ -45,6 +46,10 @@ func (r reflectionServiceServer) GetCodecDescriptor(_ context.Context, _ *GetCod
 	return &GetCodecDescriptorResponse{Codec: r.desc.Codec}, nil
 }
 
+func (r reflectionServiceServer) GetConfigurationDescriptor(_ context.Context, _ *GetConfigurationDescriptorRequest) (*GetConfigurationDescriptorResponse, error) {
+	return nil, errors.New("this endpoint has been depreacted, please see auth/Bech32Prefix for the data you are seeking")
+}
+
 func (r reflectionServiceServer) GetQueryServicesDescriptor(_ context.Context, _ *GetQueryServicesDescriptorRequest) (*GetQueryServicesDescriptorResponse, error) {
 	return &GetQueryServicesDescriptorResponse{Queries: r.desc.QueryServices}, nil
 }
@@ -56,6 +61,7 @@ func (r reflectionServiceServer) GetTxDescriptor(_ context.Context, _ *GetTxDesc
 func newReflectionServiceServer(grpcSrv *grpc.Server, conf Config) (reflectionServiceServer, error) {
 	// set chain descriptor
 	chainDescriptor := &ChainDescriptor{Id: conf.ChainID}
+
 	// set codec descriptor
 	codecDescriptor, err := newCodecDescriptor(conf.InterfaceRegistry)
 	if err != nil {