Allowing optional fee for top-level NymdClient (#1541)

* Allowing optional fee for top-level NymdClient

* Updated changelog

* Fixed usages of said methods in validator-api

CHANGELOG.md

@@ -2,6 +2,15 @@
 
 Post 1.0.0 release, the changelog format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Changed
+
+- validator-client: made `fee` argument optional for `execute` and `execute_multiple` ([#1541])
+
+[#1541]: https://github.com/nymtech/nym/pull/1541
+
+
 ## [nym-binaries-1.0.2](https://github.com/nymtech/nym/tree/nym-binaries-1.0.2)
 
 ### Added

common/client-libs/validator-client/src/nymd/mod.rs

@@ -893,7 +893,7 @@ impl<C> NymdClient<C> {
         &self,
         contract_address: &AccountId,
         msg: &M,
-        fee: Fee,
+        fee: Option<Fee>,
         memo: impl Into<String> + Send + 'static,
         funds: Vec<Coin>,
     ) -> Result<ExecuteResult, NymdError>
@@ -901,6 +901,7 @@ impl<C> NymdClient<C> {
         C: SigningCosmWasmClient + Sync,
         M: ?Sized + Serialize + Sync,
     {
+        let fee = fee.unwrap_or(Fee::Auto(Some(self.simulated_gas_multiplier)));
         self.client
             .execute(self.address(), contract_address, msg, fee, memo, funds)
             .await
@@ -910,7 +911,7 @@ impl<C> NymdClient<C> {
         &self,
         contract_address: &AccountId,
         msgs: I,
-        fee: Fee,
+        fee: Option<Fee>,
         memo: impl Into<String> + Send + 'static,
     ) -> Result<ExecuteResult, NymdError>
     where
@@ -918,6 +919,7 @@ impl<C> NymdClient<C> {
         I: IntoIterator<Item = (M, Vec<Coin>)> + Send,
         M: Serialize,
     {
+        let fee = fee.unwrap_or(Fee::Auto(Some(self.simulated_gas_multiplier)));
         self.client
             .execute_multiple(self.address(), contract_address, msgs, fee, memo)
             .await

validator-api/src/nymd_client.rs

@@ -364,15 +364,14 @@ impl<C> Client<C> {
 
         let memo = "Performing epoch operations".to_string();
 
-        self.execute_multiple_with_retry(msgs, Default::default(), memo)
-            .await?;
+        self.execute_multiple_with_retry(msgs, None, memo).await?;
         Ok(())
     }
 
     async fn execute_multiple_with_retry<M>(
         &self,
         msgs: Vec<(M, Vec<Coin>)>,
-        fee: Fee,
+        fee: Option<Fee>,
         memo: String,
     ) -> Result<(), RewardingError>
     where