Add signing infos

proto/cosmos/slashing/query.proto

@@ -47,6 +47,6 @@ message QuerySigningInfosRequest{
 // QuerySigningInfosResponse is the response type for the Query/SigningInfos RPC method
 message QuerySigningInfosResponse{
 	// info is the signing info of all validators
-	repeated cosmos.slashing.ValidatorSigningInfo info = 1;
+	repeated cosmos.slashing.ValidatorSigningInfo info = 1[(gogoproto.nullable)= false];
 	cosmos.query.PageResponse res =2;
 }

x/slashing/keeper/grpc_query.go

@@ -6,7 +6,9 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 
+	"github.com/cosmos/cosmos-sdk/store/prefix"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/types/query"
 	"github.com/cosmos/cosmos-sdk/x/slashing/types"
 )
 
@@ -28,6 +30,10 @@ func (k Keeper) SigningInfo(c context.Context, req *types.QuerySigningInfoReques
 		return nil, status.Errorf(codes.InvalidArgument, "empty request")
 	}
 
+	if req.ConsAddress == nil {
+		return nil, status.Errorf(codes.InvalidArgument, "invalid request")
+	}
+
 	ctx := sdk.UnwrapSDKContext(c)
 	signingInfo, found := k.GetValidatorSigningInfo(ctx, req.ConsAddress)
 	if !found {
@@ -42,6 +48,22 @@ func (k Keeper) SigningInfos(c context.Context, req *types.QuerySigningInfosRequ
 		return nil, status.Errorf(codes.InvalidArgument, "empty request")
 	}
 
-	_ = sdk.UnwrapSDKContext(c)
-	return nil, nil
+	ctx := sdk.UnwrapSDKContext(c)
+	store := ctx.KVStore(k.storeKey)
+	var signInfos []types.ValidatorSigningInfo
+
+	sigInfoStore := prefix.NewStore(store, types.ValidatorSigningInfoKeyPrefix)
+	res, err := query.Paginate(sigInfoStore, req.Req, func(key []byte, value []byte) error {
+		var info types.ValidatorSigningInfo
+		err := k.cdc.UnmarshalBinaryBare(value, &info)
+		if err != nil {
+			return err
+		}
+		signInfos = append(signInfos, info)
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &types.QuerySigningInfosResponse{Info: signInfos, Res: res}, nil
 }