Add new grpc query

Author: chipshort

packages/std/src/query/mod.rs

@@ -2,7 +2,6 @@ use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
 use crate::prelude::*;
-#[cfg(feature = "stargate")]
 use crate::Binary;
 use crate::Empty;
 
@@ -63,6 +62,22 @@ pub enum QueryRequest<C> {
     #[cfg(feature = "stargate")]
     Ibc(IbcQuery),
     Wasm(WasmQuery),
+    Grpc(GrpcQuery),
+}
+
+/// Queries the chain using a grpc query.
+/// This allows to query information that is not exposed in our API.
+/// The chain needs to whitelist the supported queries.
+/// The drawback of this query is that you have to handle the protobuf encoding and decoding yourself.
+///
+/// The returned data is protobuf encoded. The protobuf type depends on the query.
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, JsonSchema)]
+pub struct GrpcQuery {
+    /// The fully qualified service path used for routing,
+    /// eg. "custom/cosmos_sdk.x.bank.v1.Query/QueryBalance"
+    path: String,
+    /// The expected protobuf message type (not any), binary encoded
+    data: Binary,
 }
 
 /// A trait that is required to avoid conflicts with other query types like BankQuery and WasmQuery

packages/std/src/testing/mock.rs

@@ -605,6 +605,9 @@ impl<C: CustomQuery + DeserializeOwned> MockQuerier<C> {
             QueryRequest::Stargate { .. } => SystemResult::Err(SystemError::UnsupportedRequest {
                 kind: "Stargate".to_string(),
             }),
+            QueryRequest::Grpc(_) => SystemResult::Err(SystemError::UnsupportedRequest {
+                kind: "GRPC".to_string(),
+            }),
             #[cfg(feature = "stargate")]
             QueryRequest::Ibc(msg) => self.ibc.query(msg),
         }