Extend ContractInfo for custom data (#492)

* Extend ContractInfo with custom data

* Review comments

proto/cosmwasm/wasm/v1beta1/query.proto

@@ -67,8 +67,11 @@ message QueryContractInfoResponse {
 
   // address is the address of the contract
   string address = 1;
-  ContractInfo contract_info = 2
-      [ (gogoproto.embed) = true, (gogoproto.jsontag) = "" ];
+  ContractInfo contract_info = 2 [
+    (gogoproto.embed) = true,
+    (gogoproto.nullable) = false,
+    (gogoproto.jsontag) = ""
+  ];
 }
 
 // QueryContractHistoryRequest is the request type for the Query/ContractHistory
@@ -103,8 +106,11 @@ message ContractInfoWithAddress {
   option (gogoproto.equal) = true;
 
   string address = 1;
-  ContractInfo contract_info = 2
-      [ (gogoproto.embed) = true, (gogoproto.jsontag) = "" ];
+  ContractInfo contract_info = 2 [
+    (gogoproto.embed) = true,
+    (gogoproto.nullable) = false,
+    (gogoproto.jsontag) = ""
+  ];
 }
 // QueryContractsByCodeResponse is the response type for the
 // Query/ContractsByCode RPC method

proto/cosmwasm/wasm/v1beta1/types.proto

@@ -1,7 +1,9 @@
 syntax = "proto3";
 package cosmwasm.wasm.v1beta1;
 
+import "cosmos_proto/cosmos.proto";
 import "gogoproto/gogo.proto";
+import "google/protobuf/any.proto";
 
 option go_package = "github.com/CosmWasm/wasmd/x/wasm/types";
 option (gogoproto.goproto_getters_all) = false;
@@ -83,6 +85,11 @@ message ContractInfo {
   // use for sorting
   AbsoluteTxPosition created = 5;
   string ibc_port_id = 6 [ (gogoproto.customname) = "IBCPortID" ];
+
+  // Extension is an extension point to store custom metadata within the
+  // persistence model.
+  google.protobuf.Any extension = 7
+      [ (cosmos_proto.accepts_interface) = "ContractInfoExtension" ];
 }
 
 // ContractCodeHistoryOperationType actions that caused a code change