feat: implement x/params get all subspaces/keys (#9884)

CHANGELOG.md

@@ -39,6 +39,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Features
 
+* [\#9884](https://github.com/cosmos/cosmos-sdk/pull/9884) Provide a new gRPC query handler, `/cosmos/params/v1beta1/subspaces`, that allows the ability to query for all registered subspaces and their respective keys.
 * [\#9860](https://github.com/cosmos/cosmos-sdk/pull/9860) Emit transaction fee in ante handler fee decorator. The event type is `tx` and the attribute is `fee`.
 * [\#9776](https://github.com/cosmos/cosmos-sdk/pull/9776) Add flag `staking-bond-denom` to specify the staking bond denomination value when initializing a new chain.
 * [\#9533](https://github.com/cosmos/cosmos-sdk/pull/9533) Added a new gRPC method, `DenomOwners`, in `x/bank` to query for all account holders of a specific denomination.

docs/core/proto-docs.md

@@ -483,6 +483,9 @@
 - [cosmos/params/v1beta1/query.proto](#cosmos/params/v1beta1/query.proto)
     - [QueryParamsRequest](#cosmos.params.v1beta1.QueryParamsRequest)
     - [QueryParamsResponse](#cosmos.params.v1beta1.QueryParamsResponse)
+    - [QuerySubspacesRequest](#cosmos.params.v1beta1.QuerySubspacesRequest)
+    - [QuerySubspacesResponse](#cosmos.params.v1beta1.QuerySubspacesResponse)
+    - [Subspace](#cosmos.params.v1beta1.Subspace)
   
     - [Query](#cosmos.params.v1beta1.Query)
   
@@ -966,7 +969,7 @@ Query defines the gRPC querier service.
 | `Accounts` | [QueryAccountsRequest](#cosmos.auth.v1beta1.QueryAccountsRequest) | [QueryAccountsResponse](#cosmos.auth.v1beta1.QueryAccountsResponse) | Accounts returns all the existing accounts | GET|/cosmos/auth/v1beta1/accounts|
 | `Account` | [QueryAccountRequest](#cosmos.auth.v1beta1.QueryAccountRequest) | [QueryAccountResponse](#cosmos.auth.v1beta1.QueryAccountResponse) | Account returns account details based on address. | GET|/cosmos/auth/v1beta1/accounts/{address}|
 | `Params` | [QueryParamsRequest](#cosmos.auth.v1beta1.QueryParamsRequest) | [QueryParamsResponse](#cosmos.auth.v1beta1.QueryParamsResponse) | Params queries all parameters. | GET|/cosmos/auth/v1beta1/params|
-| `ModuleAccounts` | [QueryModuleAccountsRequest](#cosmos.auth.v1beta1.QueryModuleAccountsRequest) | [QueryModuleAccountsResponse](#cosmos.auth.v1beta1.QueryModuleAccountsResponse) | ModuleAccounts returns all the existing Module Accounts. | GET|/cosmos/auth/v1beta1/module_accounts|
+| `ModuleAccounts` | [QueryModuleAccountsRequest](#cosmos.auth.v1beta1.QueryModuleAccountsRequest) | [QueryModuleAccountsResponse](#cosmos.auth.v1beta1.QueryModuleAccountsResponse) | ModuleAccounts returns all the existing module accounts. | GET|/cosmos/auth/v1beta1/module_accounts|
 
  <!-- end services -->
 
@@ -6957,6 +6960,50 @@ QueryParamsResponse is response type for the Query/Params RPC method.
 
 
 
+
+<a name="cosmos.params.v1beta1.QuerySubspacesRequest"></a>
+
+### QuerySubspacesRequest
+QuerySubspacesRequest defines a request type for querying for all registered
+subspaces and all keys for a subspace.
+
+
+
+
+
+
+<a name="cosmos.params.v1beta1.QuerySubspacesResponse"></a>
+
+### QuerySubspacesResponse
+QuerySubspacesResponse defines the response types for querying for all
+registered subspaces and all keys for a subspace.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| `subspaces` | [Subspace](#cosmos.params.v1beta1.Subspace) | repeated |  |
+
+
+
+
+
+
+<a name="cosmos.params.v1beta1.Subspace"></a>
+
+### Subspace
+Subspace defines a parameter subspace name and all the keys that exist for
+the subspace.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| `subspace` | [string](#string) |  |  |
+| `keys` | [string](#string) | repeated |  |
+
+
+
+
+
  <!-- end messages -->
 
  <!-- end enums -->
@@ -6972,6 +7019,7 @@ Query defines the gRPC querier service.
 | Method Name | Request Type | Response Type | Description | HTTP Verb | Endpoint |
 | ----------- | ------------ | ------------- | ------------| ------- | -------- |
 | `Params` | [QueryParamsRequest](#cosmos.params.v1beta1.QueryParamsRequest) | [QueryParamsResponse](#cosmos.params.v1beta1.QueryParamsResponse) | Params queries a specific parameter of a module, given its subspace and key. | GET|/cosmos/params/v1beta1/params|
+| `Subspaces` | [QuerySubspacesRequest](#cosmos.params.v1beta1.QuerySubspacesRequest) | [QuerySubspacesResponse](#cosmos.params.v1beta1.QuerySubspacesResponse) | Subspaces queries for all registered subspaces and all keys for a subspace. | GET|/cosmos/params/v1beta1/subspaces|
 
  <!-- end services -->
 

proto/cosmos/params/v1beta1/query.proto

@@ -14,6 +14,11 @@ service Query {
   rpc Params(QueryParamsRequest) returns (QueryParamsResponse) {
     option (google.api.http).get = "/cosmos/params/v1beta1/params";
   }
+
+  // Subspaces queries for all registered subspaces and all keys for a subspace.
+  rpc Subspaces(QuerySubspacesRequest) returns (QuerySubspacesResponse) {
+    option (google.api.http).get = "/cosmos/params/v1beta1/subspaces";
+  }
 }
 
 // QueryParamsRequest is request type for the Query/Params RPC method.
@@ -30,3 +35,20 @@ message QueryParamsResponse {
   // param defines the queried parameter.
   ParamChange param = 1 [(gogoproto.nullable) = false];
 }
+
+// QuerySubspacesRequest defines a request type for querying for all registered
+// subspaces and all keys for a subspace.
+message QuerySubspacesRequest {}
+
+// QuerySubspacesResponse defines the response types for querying for all
+// registered subspaces and all keys for a subspace.
+message QuerySubspacesResponse {
+  repeated Subspace subspaces = 1;
+}
+
+// Subspace defines a parameter subspace name and all the keys that exist for
+// the subspace.
+message Subspace {
+  string          subspace = 1;
+  repeated string keys     = 2;
+}

x/auth/types/query.pb.go

@@ -456,7 +456,7 @@ type QueryClient interface {
 	Account(ctx context.Context, in *QueryAccountRequest, opts ...grpc.CallOption) (*QueryAccountResponse, error)
 	// Params queries all parameters.
 	Params(ctx context.Context, in *QueryParamsRequest, opts ...grpc.CallOption) (*QueryParamsResponse, error)
-	// ModuleAccounts returns all the existing Module Accounts.
+	// ModuleAccounts returns all the existing module accounts.
 	ModuleAccounts(ctx context.Context, in *QueryModuleAccountsRequest, opts ...grpc.CallOption) (*QueryModuleAccountsResponse, error)
 }
 
@@ -512,7 +512,7 @@ type QueryServer interface {
 	Account(context.Context, *QueryAccountRequest) (*QueryAccountResponse, error)
 	// Params queries all parameters.
 	Params(context.Context, *QueryParamsRequest) (*QueryParamsResponse, error)
-	// ModuleAccounts returns all the existing Module Accounts.
+	// ModuleAccounts returns all the existing module accounts.
 	ModuleAccounts(context.Context, *QueryModuleAccountsRequest) (*QueryModuleAccountsResponse, error)
 }
 

x/group/types.pb.go

@@ -567,9 +567,9 @@ type Proposal struct {
 	Result Proposal_Result `protobuf:"varint,9,opt,name=result,proto3,enum=cosmos.group.v1beta1.Proposal_Result" json:"result,omitempty"`
 	// vote_state contains the sums of all weighted votes for this proposal.
 	VoteState Tally `protobuf:"bytes,10,opt,name=vote_state,json=voteState,proto3" json:"vote_state"`
-	// timeout is the timestamp of the block where the proposal execution times out. Header times of the votes and execution messages
-	// must be before this end time to be included in the election. After the timeout timestamp the proposal can not be
-	// executed anymore and should be considered pending delete.
+	// timeout is the timestamp of the block where the proposal execution times out. Header times of the votes and
+	// execution messages must be before this end time to be included in the election. After the timeout timestamp the
+	// proposal can not be executed anymore and should be considered pending delete.
 	Timeout time.Time `protobuf:"bytes,11,opt,name=timeout,proto3,stdtime" json:"timeout"`
 	// executor_result is the final result based on the votes and election rule. Initial value is NotRun.
 	ExecutorResult Proposal_ExecutorResult `protobuf:"varint,12,opt,name=executor_result,json=executorResult,proto3,enum=cosmos.group.v1beta1.Proposal_ExecutorResult" json:"executor_result,omitempty"`

x/params/keeper/grpc_query.go

@@ -34,3 +34,36 @@ func (k Keeper) Params(c context.Context, req *proposal.QueryParamsRequest) (*pr
 
 	return &proposal.QueryParamsResponse{Param: param}, nil
 }
+
+// Subspaces implements the gRPC query handler for fetching all registered
+// subspaces and all the keys for each subspace.
+func (k Keeper) Subspaces(
+	goCtx context.Context,
+	req *proposal.QuerySubspacesRequest,
+) (*proposal.QuerySubspacesResponse, error) {
+
+	if req == nil {
+		return nil, status.Errorf(codes.InvalidArgument, "empty request")
+	}
+
+	spaces := k.GetSubspaces()
+	resp := &proposal.QuerySubspacesResponse{
+		Subspaces: make([]*proposal.Subspace, len(spaces)),
+	}
+
+	ctx := sdk.UnwrapSDKContext(goCtx)
+	for i, ss := range spaces {
+		var keys []string
+		ss.IterateKeys(ctx, func(key []byte) bool {
+			keys = append(keys, string(key))
+			return false
+		})
+
+		resp.Subspaces[i] = &proposal.Subspace{
+			Subspace: ss.Name(),
+			Keys:     keys,
+		}
+	}
+
+	return resp, nil
+}

x/params/keeper/grpc_query_test.go

@@ -84,3 +84,24 @@ func (suite *KeeperTestSuite) TestGRPCQueryParams() {
 		})
 	}
 }
+
+func (suite *KeeperTestSuite) TestGRPCQuerySubspaces() {
+	ctx := sdk.WrapSDKContext(suite.ctx)
+
+	// NOTE: Each subspace will not have any keys that we can check against
+	// because InitGenesis has not been called during app construction.
+	resp, err := suite.queryClient.Subspaces(ctx, &proposal.QuerySubspacesRequest{})
+	suite.Require().NoError(err)
+	suite.Require().NotNil(resp)
+
+	spaces := make([]string, len(resp.Subspaces))
+	i := 0
+	for _, ss := range resp.Subspaces {
+		spaces[i] = ss.Subspace
+		i++
+	}
+
+	// require the response contains a few subspaces we know exist
+	suite.Require().Contains(spaces, "bank")
+	suite.Require().Contains(spaces, "staking")
+}

x/params/keeper/keeper.go

@@ -59,3 +59,15 @@ func (k Keeper) GetSubspace(s string) (types.Subspace, bool) {
 	}
 	return *space, ok
 }
+
+// GetSubspaces returns all the registered subspaces.
+func (k Keeper) GetSubspaces() []types.Subspace {
+	spaces := make([]types.Subspace, len(k.spaces))
+	i := 0
+	for _, ss := range k.spaces {
+		spaces[i] = *ss
+		i++
+	}
+
+	return spaces
+}

x/params/keeper/keeper_test.go

@@ -148,6 +148,29 @@ func indirect(ptr interface{}) interface{} {
 	return reflect.ValueOf(ptr).Elem().Interface()
 }
 
+func TestGetSubspaces(t *testing.T) {
+	_, _, _, _, keeper := testComponents()
+
+	table := types.NewKeyTable(
+		types.NewParamSetPair([]byte("string"), "", validateNoOp),
+		types.NewParamSetPair([]byte("bool"), false, validateNoOp),
+	)
+
+	_ = keeper.Subspace("key1").WithKeyTable(table)
+	_ = keeper.Subspace("key2").WithKeyTable(table)
+
+	spaces := keeper.GetSubspaces()
+	require.Len(t, spaces, 2)
+
+	var names []string
+	for _, ss := range spaces {
+		names = append(names, ss.Name())
+	}
+
+	require.Contains(t, names, "key1")
+	require.Contains(t, names, "key2")
+}
+
 func TestSubspace(t *testing.T) {
 	cdc, ctx, key, _, keeper := testComponents()
 

x/params/types/proposal/query.pb.go

@@ -130,36 +130,182 @@ func (m *QueryParamsResponse) GetParam() ParamChange {
 	return ParamChange{}
 }
 
+// QuerySubspacesRequest defines a request type for querying for all registered
+// subspaces and all keys for a subspace.
+type QuerySubspacesRequest struct {
+}
+
+func (m *QuerySubspacesRequest) Reset()         { *m = QuerySubspacesRequest{} }
+func (m *QuerySubspacesRequest) String() string { return proto.CompactTextString(m) }
+func (*QuerySubspacesRequest) ProtoMessage()    {}
+func (*QuerySubspacesRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_2b32979c1792ccc4, []int{2}
+}
+func (m *QuerySubspacesRequest) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *QuerySubspacesRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_QuerySubspacesRequest.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *QuerySubspacesRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_QuerySubspacesRequest.Merge(m, src)
+}
+func (m *QuerySubspacesRequest) XXX_Size() int {
+	return m.Size()
+}
+func (m *QuerySubspacesRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_QuerySubspacesRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_QuerySubspacesRequest proto.InternalMessageInfo
+
+// QuerySubspacesResponse defines the response types for querying for all
+// registered subspaces and all keys for a subspace.
+type QuerySubspacesResponse struct {
+	Subspaces []*Subspace `protobuf:"bytes,1,rep,name=subspaces,proto3" json:"subspaces,omitempty"`
+}
+
+func (m *QuerySubspacesResponse) Reset()         { *m = QuerySubspacesResponse{} }
+func (m *QuerySubspacesResponse) String() string { return proto.CompactTextString(m) }
+func (*QuerySubspacesResponse) ProtoMessage()    {}
+func (*QuerySubspacesResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_2b32979c1792ccc4, []int{3}
+}
+func (m *QuerySubspacesResponse) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *QuerySubspacesResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_QuerySubspacesResponse.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *QuerySubspacesResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_QuerySubspacesResponse.Merge(m, src)
+}
+func (m *QuerySubspacesResponse) XXX_Size() int {
+	return m.Size()
+}
+func (m *QuerySubspacesResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_QuerySubspacesResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_QuerySubspacesResponse proto.InternalMessageInfo
+
+func (m *QuerySubspacesResponse) GetSubspaces() []*Subspace {
+	if m != nil {
+		return m.Subspaces
+	}
+	return nil
+}
+
+// Subspace defines a parameter subspace name and all the keys that exist for
+// the subspace.
+type Subspace struct {
+	Subspace string   `protobuf:"bytes,1,opt,name=subspace,proto3" json:"subspace,omitempty"`
+	Keys     []string `protobuf:"bytes,2,rep,name=keys,proto3" json:"keys,omitempty"`
+}
+
+func (m *Subspace) Reset()         { *m = Subspace{} }
+func (m *Subspace) String() string { return proto.CompactTextString(m) }
+func (*Subspace) ProtoMessage()    {}
+func (*Subspace) Descriptor() ([]byte, []int) {
+	return fileDescriptor_2b32979c1792ccc4, []int{4}
+}
+func (m *Subspace) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *Subspace) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_Subspace.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *Subspace) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Subspace.Merge(m, src)
+}
+func (m *Subspace) XXX_Size() int {
+	return m.Size()
+}
+func (m *Subspace) XXX_DiscardUnknown() {
+	xxx_messageInfo_Subspace.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Subspace proto.InternalMessageInfo
+
+func (m *Subspace) GetSubspace() string {
+	if m != nil {
+		return m.Subspace
+	}
+	return ""
+}
+
+func (m *Subspace) GetKeys() []string {
+	if m != nil {
+		return m.Keys
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*QueryParamsRequest)(nil), "cosmos.params.v1beta1.QueryParamsRequest")
 	proto.RegisterType((*QueryParamsResponse)(nil), "cosmos.params.v1beta1.QueryParamsResponse")
+	proto.RegisterType((*QuerySubspacesRequest)(nil), "cosmos.params.v1beta1.QuerySubspacesRequest")
+	proto.RegisterType((*QuerySubspacesResponse)(nil), "cosmos.params.v1beta1.QuerySubspacesResponse")
+	proto.RegisterType((*Subspace)(nil), "cosmos.params.v1beta1.Subspace")
 }
 
 func init() { proto.RegisterFile("cosmos/params/v1beta1/query.proto", fileDescriptor_2b32979c1792ccc4) }
 
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+	0x07, 0xb8, 0x86, 0xbf, 0x79, 0x47, 0x8f, 0x60, 0x65, 0xcc, 0x32, 0x53, 0x57, 0xeb, 0xf5, 0x88,
+	0x7f, 0xc0, 0xc7, 0xf7, 0x34, 0xa4, 0xe0, 0x91, 0x64, 0xe8, 0x13, 0xac, 0x29, 0x2b, 0xa5, 0xd0,
+	0xec, 0x61, 0x6f, 0xe7, 0xcd, 0x3c, 0xc5, 0xfa, 0x3c, 0xa4, 0x51, 0xc8, 0xfa, 0xd5, 0xf9, 0x55,
+	0x5b, 0xf3, 0x73, 0x1a, 0x7e, 0x06, 0x5b, 0x4a, 0xf6, 0x7b, 0xe1, 0x5c, 0xa6, 0xc3, 0x3f, 0xe1,
+	0xd3, 0xed, 0x83, 0xc2, 0xf2, 0x23, 0x34, 0xca, 0x9c, 0xd2, 0x04, 0x4e, 0xc5, 0x6d, 0xf6, 0xda,
+	0x7b, 0x6c, 0x4b, 0xb2, 0x7f, 0xc7, 0xc0, 0x1f, 0x60, 0xa3, 0x5c, 0x1f, 0xac, 0x00, 0xc1, 0xea,
+	0x98, 0x65, 0xd2, 0xd4, 0x9d, 0x8a, 0x6b, 0xf8, 0x6a, 0xee, 0x9d, 0xeb, 0xb0, 0xa6, 0x52, 0xa1,
+	0xff, 0x00, 0xd6, 0xf3, 0x2a, 0xd0, 0xeb, 0x3d, 0xe6, 0x0f, 0x2b, 0xb7, 0xde, 0x1c, 0x03, 0xcd,
+	0xaf, 0x89, 0x5f, 0xfd, 0xbb, 0xb8, 0x39, 0xd3, 0xdb, 0xe8, 0x05, 0x39, 0xf4, 0x85, 0xd1, 0x29,
+	0x80, 0xc6, 0xa6, 0x23, 0xf4, 0xf6, 0x90, 0xc1, 0x76, 0xc7, 0x56, 0xe7, 0x48, 0x74, 0x91, 0xc8,
+	0x55, 0x89, 0x30, 0x72, 0xf6, 0x24, 0xda, 0x74, 0xdc, 0xff, 0x32, 0x5f, 0xda, 0x60, 0xb1, 0xb4,
+	0xc1, 0xf5, 0xd2, 0x06, 0x27, 0x2b, 0x5b, 0x5b, 0xac, 0x6c, 0xed, 0x72, 0x65, 0x6b, 0xbf, 0xde,
+	0x87, 0xa3, 0x64, 0x98, 0x06, 0xde, 0x80, 0x4f, 0x4b, 0x95, 0xfc, 0xd1, 0x91, 0xbf, 0xc7, 0xe4,
+	0x6f, 0x29, 0x99, 0x64, 0x82, 0x49, 0x22, 0x62, 0x2e, 0xb8, 0xa4, 0x93, 0xa0, 0xae, 0xfe, 0xe3,
+	0x77, 0xb7, 0x01, 0x00, 0x00, 0xff, 0xff, 0x69, 0xa9, 0xbc, 0x11, 0x5b, 0x03, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -177,6 +323,8 @@ type QueryClient interface {
 	// Params queries a specific parameter of a module, given its subspace and
 	// key.
 	Params(ctx context.Context, in *QueryParamsRequest, opts ...grpc.CallOption) (*QueryParamsResponse, error)
+	// Subspaces queries for all registered subspaces and all keys for a subspace.
+	Subspaces(ctx context.Context, in *QuerySubspacesRequest, opts ...grpc.CallOption) (*QuerySubspacesResponse, error)
 }
 
 type queryClient struct {
@@ -196,11 +344,22 @@ func (c *queryClient) Params(ctx context.Context, in *QueryParamsRequest, opts .
 	return out, nil
 }
 
+func (c *queryClient) Subspaces(ctx context.Context, in *QuerySubspacesRequest, opts ...grpc.CallOption) (*QuerySubspacesResponse, error) {
+	out := new(QuerySubspacesResponse)
+	err := c.cc.Invoke(ctx, "/cosmos.params.v1beta1.Query/Subspaces", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // QueryServer is the server API for Query service.
 type QueryServer interface {
 	// Params queries a specific parameter of a module, given its subspace and
 	// key.
 	Params(context.Context, *QueryParamsRequest) (*QueryParamsResponse, error)
+	// Subspaces queries for all registered subspaces and all keys for a subspace.
+	Subspaces(context.Context, *QuerySubspacesRequest) (*QuerySubspacesResponse, error)
 }
 
 // UnimplementedQueryServer can be embedded to have forward compatible implementations.
@@ -210,6 +369,9 @@ type UnimplementedQueryServer struct {
 func (*UnimplementedQueryServer) Params(ctx context.Context, req *QueryParamsRequest) (*QueryParamsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Params not implemented")
 }
+func (*UnimplementedQueryServer) Subspaces(ctx context.Context, req *QuerySubspacesRequest) (*QuerySubspacesResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Subspaces not implemented")
+}
 
 func RegisterQueryServer(s grpc1.Server, srv QueryServer) {
 	s.RegisterService(&_Query_serviceDesc, srv)
@@ -233,6 +395,24 @@ func _Query_Params_Handler(srv interface{}, ctx context.Context, dec func(interf
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Query_Subspaces_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(QuerySubspacesRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(QueryServer).Subspaces(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/cosmos.params.v1beta1.Query/Subspaces",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(QueryServer).Subspaces(ctx, req.(*QuerySubspacesRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Query_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "cosmos.params.v1beta1.Query",
 	HandlerType: (*QueryServer)(nil),
@@ -241,6 +421,10 @@ var _Query_serviceDesc = grpc.ServiceDesc{
 			MethodName: "Params",
 			Handler:    _Query_Params_Handler,
 		},
+		{
+			MethodName: "Subspaces",
+			Handler:    _Query_Subspaces_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "cosmos/params/v1beta1/query.proto",
@@ -316,6 +500,105 @@ func (m *QueryParamsResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *QuerySubspacesRequest) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *QuerySubspacesRequest) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *QuerySubspacesRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	return len(dAtA) - i, nil
+}
+
+func (m *QuerySubspacesResponse) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *QuerySubspacesResponse) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *QuerySubspacesResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if len(m.Subspaces) > 0 {
+		for iNdEx := len(m.Subspaces) - 1; iNdEx >= 0; iNdEx-- {
+			{
+				size, err := m.Subspaces[iNdEx].MarshalToSizedBuffer(dAtA[:i])
+				if err != nil {
+					return 0, err
+				}
+				i -= size
+				i = encodeVarintQuery(dAtA, i, uint64(size))
+			}
+			i--
+			dAtA[i] = 0xa
+		}
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *Subspace) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *Subspace) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *Subspace) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if len(m.Keys) > 0 {
+		for iNdEx := len(m.Keys) - 1; iNdEx >= 0; iNdEx-- {
+			i -= len(m.Keys[iNdEx])
+			copy(dAtA[i:], m.Keys[iNdEx])
+			i = encodeVarintQuery(dAtA, i, uint64(len(m.Keys[iNdEx])))
+			i--
+			dAtA[i] = 0x12
+		}
+	}
+	if len(m.Subspace) > 0 {
+		i -= len(m.Subspace)
+		copy(dAtA[i:], m.Subspace)
+		i = encodeVarintQuery(dAtA, i, uint64(len(m.Subspace)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
 func encodeVarintQuery(dAtA []byte, offset int, v uint64) int {
 	offset -= sovQuery(v)
 	base := offset
@@ -355,6 +638,49 @@ func (m *QueryParamsResponse) Size() (n int) {
 	return n
 }
 
+func (m *QuerySubspacesRequest) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	return n
+}
+
+func (m *QuerySubspacesResponse) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if len(m.Subspaces) > 0 {
+		for _, e := range m.Subspaces {
+			l = e.Size()
+			n += 1 + l + sovQuery(uint64(l))
+		}
+	}
+	return n
+}
+
+func (m *Subspace) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Subspace)
+	if l > 0 {
+		n += 1 + l + sovQuery(uint64(l))
+	}
+	if len(m.Keys) > 0 {
+		for _, s := range m.Keys {
+			l = len(s)
+			n += 1 + l + sovQuery(uint64(l))
+		}
+	}
+	return n
+}
+
 func sovQuery(x uint64) (n int) {
 	return (math_bits.Len64(x|1) + 6) / 7
 }
@@ -558,6 +884,254 @@ func (m *QueryParamsResponse) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *QuerySubspacesRequest) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowQuery
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: QuerySubspacesRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: QuerySubspacesRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		default:
+			iNdEx = preIndex
+			skippy, err := skipQuery(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthQuery
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *QuerySubspacesResponse) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowQuery
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: QuerySubspacesResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: QuerySubspacesResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Subspaces", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowQuery
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthQuery
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthQuery
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Subspaces = append(m.Subspaces, &Subspace{})
+			if err := m.Subspaces[len(m.Subspaces)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipQuery(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthQuery
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *Subspace) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowQuery
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: Subspace: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: Subspace: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Subspace", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowQuery
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthQuery
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthQuery
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Subspace = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Keys", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowQuery
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthQuery
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthQuery
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Keys = append(m.Keys, string(dAtA[iNdEx:postIndex]))
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipQuery(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthQuery
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipQuery(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0

x/params/types/proposal/query.pb.gw.go

@@ -67,6 +67,24 @@ func local_request_Query_Params_0(ctx context.Context, marshaler runtime.Marshal
 
 }
 
+func request_Query_Subspaces_0(ctx context.Context, marshaler runtime.Marshaler, client QueryClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq QuerySubspacesRequest
+	var metadata runtime.ServerMetadata
+
+	msg, err := client.Subspaces(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_Query_Subspaces_0(ctx context.Context, marshaler runtime.Marshaler, server QueryServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq QuerySubspacesRequest
+	var metadata runtime.ServerMetadata
+
+	msg, err := server.Subspaces(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
 // RegisterQueryHandlerServer registers the http handlers for service Query to "mux".
 // UnaryRPC     :call QueryServer directly.
 // StreamingRPC :currently unsupported pending https://github.com/grpc/grpc-go/issues/906.
@@ -93,6 +111,26 @@ func RegisterQueryHandlerServer(ctx context.Context, mux *runtime.ServeMux, serv
 
 	})
 
+	mux.Handle("GET", pattern_Query_Subspaces_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateIncomingContext(ctx, mux, req)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_Query_Subspaces_0(rctx, inboundMarshaler, server, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_Query_Subspaces_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	return nil
 }
 
@@ -154,13 +192,37 @@ func RegisterQueryHandlerClient(ctx context.Context, mux *runtime.ServeMux, clie
 
 	})
 
+	mux.Handle("GET", pattern_Query_Subspaces_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateContext(ctx, mux, req)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_Query_Subspaces_0(rctx, inboundMarshaler, client, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_Query_Subspaces_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	return nil
 }
 
 var (
 	pattern_Query_Params_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 1}, []string{"cosmos", "params", "v1beta1"}, "", runtime.AssumeColonVerbOpt(false)))
+
+	pattern_Query_Subspaces_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3}, []string{"cosmos", "params", "v1beta1", "subspaces"}, "", runtime.AssumeColonVerbOpt(false)))
 )
 
 var (
 	forward_Query_Params_0 = runtime.ForwardResponseMessage
+
+	forward_Query_Subspaces_0 = runtime.ForwardResponseMessage
 )

x/params/types/subspace.go

@@ -127,6 +127,22 @@ func (s Subspace) GetIfExists(ctx sdk.Context, key []byte, ptr interface{}) {
 	}
 }
 
+// IterateKeys iterates over all the keys in the subspace and executes the
+// provided callback. If the callback returns true for a given key, iteration
+// will halt.
+func (s Subspace) IterateKeys(ctx sdk.Context, cb func(key []byte) bool) {
+	store := s.kvStore(ctx)
+
+	iter := sdk.KVStorePrefixIterator(store, nil)
+	defer iter.Close()
+
+	for ; iter.Valid(); iter.Next() {
+		if cb(iter.Key()) {
+			break
+		}
+	}
+}
+
 // GetRaw queries for the raw values bytes for a parameter by key.
 func (s Subspace) GetRaw(ctx sdk.Context, key []byte) []byte {
 	store := s.kvStore(ctx)

x/params/types/subspace_test.go

@@ -1,6 +1,7 @@
 package types_test
 
 import (
+	"bytes"
 	"fmt"
 	"testing"
 	"time"
@@ -92,6 +93,41 @@ func (suite *SubspaceTestSuite) TestGetRaw() {
 	})
 }
 
+func (suite *SubspaceTestSuite) TestIterateKeys() {
+	suite.Require().NotPanics(func() {
+		suite.ss.Set(suite.ctx, keyUnbondingTime, time.Second)
+	})
+	suite.Require().NotPanics(func() {
+		suite.ss.Set(suite.ctx, keyMaxValidators, uint16(50))
+	})
+	suite.Require().NotPanics(func() {
+		suite.ss.Set(suite.ctx, keyBondDenom, "stake")
+	})
+
+	var keys [][]byte
+	suite.ss.IterateKeys(suite.ctx, func(key []byte) bool {
+		keys = append(keys, key)
+		return false
+	})
+	suite.Require().Len(keys, 3)
+	suite.Require().Contains(keys, keyUnbondingTime)
+	suite.Require().Contains(keys, keyMaxValidators)
+	suite.Require().Contains(keys, keyBondDenom)
+
+	var keys2 [][]byte
+	suite.ss.IterateKeys(suite.ctx, func(key []byte) bool {
+		if bytes.Equal(key, keyUnbondingTime) {
+			return true
+		}
+
+		keys2 = append(keys2, key)
+		return false
+	})
+	suite.Require().Len(keys2, 2)
+	suite.Require().Contains(keys2, keyMaxValidators)
+	suite.Require().Contains(keys2, keyBondDenom)
+}
+
 func (suite *SubspaceTestSuite) TestHas() {
 	t := time.Hour * 48