Merge pull request #183 from PeggyJV/zaki/empty_fees_for_zero_fees

Use an empty struct zero fees

orchestrator/cosmos_gravity/src/lib.rs

@@ -9,4 +9,4 @@ extern crate log;
 pub mod build;
 pub mod query;
 pub mod send;
-pub mod utils;
+pub mod utils;

orchestrator/cosmos_gravity/src/send.rs

@@ -132,22 +132,31 @@ pub async fn send_messages(
 ) -> Result<TxResponse, CosmosGrpcError> {
     let cosmos_address = cosmos_key.to_address(&contact.get_prefix()).unwrap();
 
-    let gas_limit = 500_000_000 * messages.len();
+    let gas_limit = 500_000_000 * messages.len() as u64;
 
     let fee_amount: f64 = (gas_limit as f64) * gas_price.0;
     let fee_amount: u64 = fee_amount.abs().ceil() as u64;
 
-    let fee_amount = Coin {
-        denom: gas_price.1,
-        amount: fee_amount.into(),
-    };
-
-    let gas_limit = gas_limit as u64;
-    let fee = Fee {
-        amount: vec![fee_amount],
-        gas_limit,
-        granter: None,
-        payer: None,
+    let fee = if fee_amount > 0 {
+        let fee_amount = Coin {
+            denom: gas_price.1,
+            amount: fee_amount.into(),
+        };
+
+        let gas_limit = gas_limit as u64;
+        Fee {
+            amount: vec![fee_amount],
+            gas_limit,
+            granter: None,
+            payer: None,
+        }
+    } else {
+        Fee {
+            amount: Vec::new(),
+            gas_limit,
+            granter: None,
+            payer: None,
+        }
     };
 
     let args = contact.get_message_args(cosmos_address, fee).await?;