Merge pull request #839 from CosmWasm/querier-wrapper-in-helpers

Use QuerierWrapper not Querier in cw20 helpers

contracts/cw3-flex-multisig/src/contract.rs

@@ -770,7 +770,7 @@ mod tests {
             .unwrap();
 
         // Verify contract version set properly
-        let version = query_contract_info(&app, flex_addr.clone()).unwrap();
+        let version = query_contract_info(&app.wrap(), flex_addr.clone()).unwrap();
         assert_eq!(
             ContractVersion {
                 contract: CONTRACT_NAME.to_string(),

packages/cw2/src/lib.rs

@@ -18,7 +18,7 @@ For more information on this specification, please check out the
 */
 
 use cosmwasm_schema::cw_serde;
-use cosmwasm_std::{Empty, Querier, QuerierWrapper, QueryRequest, StdResult, Storage, WasmQuery};
+use cosmwasm_std::{CustomQuery, QuerierWrapper, QueryRequest, StdResult, Storage, WasmQuery};
 use cw_storage_plus::Item;
 
 pub const CONTRACT: Item<ContractVersion> = Item::new("contract_info");
@@ -59,15 +59,19 @@ pub fn set_contract_version<T: Into<String>, U: Into<String>>(
 /// if the other contract exists and claims to be a cw20-base contract for example.
 /// (Note: you usually want to require *interfaces* not *implementations* of the
 /// contracts you compose with, so be careful of overuse)
-pub fn query_contract_info<Q: Querier, T: Into<String>>(
-    querier: &Q,
+pub fn query_contract_info<T, CQ>(
+    querier: &QuerierWrapper<CQ>,
     contract_addr: T,
-) -> StdResult<ContractVersion> {
+) -> StdResult<ContractVersion>
+where
+    T: Into<String>,
+    CQ: CustomQuery,
+{
     let req = QueryRequest::Wasm(WasmQuery::Raw {
         contract_addr: contract_addr.into(),
         key: CONTRACT.as_slice().into(),
     });
-    QuerierWrapper::<Empty>::new(querier).query(&req)
+    querier.query(&req)
 }
 
 #[cfg(test)]

packages/cw20/src/helpers.rs

@@ -1,7 +1,7 @@
 use cosmwasm_schema::cw_serde;
 use cosmwasm_std::{
-    to_binary, Addr, CosmosMsg, CustomQuery, Querier, QuerierWrapper, StdResult, Uint128, WasmMsg,
-    WasmQuery,
+    to_binary, Addr, CosmosMsg, CustomQuery, QuerierWrapper, QueryRequest, StdResult, Uint128,
+    WasmMsg, WasmQuery,
 };
 
 use crate::{
@@ -31,89 +31,75 @@ impl Cw20Contract {
         .into())
     }
 
+    fn encode_smart_query<CQ: CustomQuery>(
+        &self,
+        msg: Cw20QueryMsg,
+    ) -> StdResult<QueryRequest<CQ>> {
+        Ok(WasmQuery::Smart {
+            contract_addr: self.addr().into(),
+            msg: to_binary(&msg)?,
+        }
+        .into())
+    }
+
     /// Get token balance for the given address
-    pub fn balance<Q, T, CQ>(&self, querier: &Q, address: T) -> StdResult<Uint128>
+    pub fn balance<T, CQ>(&self, querier: &QuerierWrapper<CQ>, address: T) -> StdResult<Uint128>
     where
-        Q: Querier,
         T: Into<String>,
         CQ: CustomQuery,
     {
-        let msg = Cw20QueryMsg::Balance {
+        let query = self.encode_smart_query(Cw20QueryMsg::Balance {
             address: address.into(),
-        };
-        let query = WasmQuery::Smart {
-            contract_addr: self.addr().into(),
-            msg: to_binary(&msg)?,
-        }
-        .into();
-        let res: BalanceResponse = QuerierWrapper::<CQ>::new(querier).query(&query)?;
+        })?;
+        let res: BalanceResponse = querier.query(&query)?;
         Ok(res.balance)
     }
 
     /// Get metadata from the contract. This is a good check that the address
     /// is a valid Cw20 contract.
-    pub fn meta<Q, CQ>(&self, querier: &Q) -> StdResult<TokenInfoResponse>
-    where
-        Q: Querier,
-        CQ: CustomQuery,
-    {
-        let msg = Cw20QueryMsg::TokenInfo {};
-        let query = WasmQuery::Smart {
-            contract_addr: self.addr().into(),
-            msg: to_binary(&msg)?,
-        }
-        .into();
-        QuerierWrapper::<CQ>::new(querier).query(&query)
+    pub fn meta<CQ: CustomQuery>(
+        &self,
+        querier: &QuerierWrapper<CQ>,
+    ) -> StdResult<TokenInfoResponse> {
+        let query = self.encode_smart_query(Cw20QueryMsg::TokenInfo {})?;
+        querier.query(&query)
     }
 
     /// Get allowance of spender to use owner's account
-    pub fn allowance<Q, T, U, CQ>(
+    pub fn allowance<T, U, CQ>(
         &self,
-        querier: &Q,
+        querier: &QuerierWrapper<CQ>,
         owner: T,
         spender: U,
     ) -> StdResult<AllowanceResponse>
     where
-        Q: Querier,
         T: Into<String>,
         U: Into<String>,
         CQ: CustomQuery,
     {
-        let msg = Cw20QueryMsg::Allowance {
+        let query = self.encode_smart_query(Cw20QueryMsg::Allowance {
             owner: owner.into(),
             spender: spender.into(),
-        };
-        let query = WasmQuery::Smart {
-            contract_addr: self.addr().into(),
-            msg: to_binary(&msg)?,
-        }
-        .into();
-        QuerierWrapper::<CQ>::new(querier).query(&query)
+        })?;
+        querier.query(&query)
     }
 
     /// Find info on who can mint, and how much
-    pub fn minter<Q, CQ>(&self, querier: &Q) -> StdResult<Option<MinterResponse>>
-    where
-        Q: Querier,
-        CQ: CustomQuery,
-    {
-        let msg = Cw20QueryMsg::Minter {};
-        let query = WasmQuery::Smart {
-            contract_addr: self.addr().into(),
-            msg: to_binary(&msg)?,
-        }
-        .into();
-        QuerierWrapper::<CQ>::new(querier).query(&query)
+    pub fn minter<CQ: CustomQuery>(
+        &self,
+        querier: &QuerierWrapper<CQ>,
+    ) -> StdResult<Option<MinterResponse>> {
+        let query = self.encode_smart_query(Cw20QueryMsg::Minter {})?;
+        querier.query(&query)
     }
 
     /// returns true if the contract supports the allowance extension
-    pub fn has_allowance<Q: Querier, CQ: CustomQuery>(&self, querier: &Q) -> bool {
-        self.allowance::<_, _, _, CQ>(querier, self.addr(), self.addr())
-            .is_ok()
+    pub fn has_allowance<CQ: CustomQuery>(&self, querier: &QuerierWrapper<CQ>) -> bool {
+        self.allowance(querier, self.addr(), self.addr()).is_ok()
     }
 
     /// returns true if the contract supports the mintable extension
-    pub fn is_mintable<Q: Querier, CQ: CustomQuery>(&self, querier: &Q) -> bool {
-        self.minter::<_, CQ>(querier).is_ok()
+    pub fn is_mintable<CQ: CustomQuery>(&self, querier: &QuerierWrapper<CQ>) -> bool {
+        self.minter(querier).is_ok()
     }
 }