Documented fee_granter in config.toml.

Some fmt & clippy fixes.

config.toml

@@ -223,6 +223,12 @@ memo_prefix = ''
 #   ['transfer', 'channel-0'],
 # ]
 
+# Specify that the transaction fees should be payed from this fee granter's account.
+# Optional. If unspecified (the default behavior), then no fee granter is used, and
+# the account specified in `key_name` will pay the tx fees for all transactions
+# submitted to this chain.
+# fee_granter = ''
+
 [[chains]]
 id = 'ibc-1'
 rpc_addr = 'http://127.0.0.1:26557'

relayer/src/chain/cosmos.rs

@@ -444,7 +444,10 @@ impl CosmosSdkChain {
 
     /// Get the fee granter address
     fn fee_granter(&self) -> &str {
-        self.config.fee_granter.as_deref().unwrap_or(DEFAULT_FEE_GRANTER)
+        self.config
+            .fee_granter
+            .as_deref()
+            .unwrap_or(DEFAULT_FEE_GRANTER)
     }
 
     /// The gas price

relayer/src/chain/mock.rs

@@ -459,6 +459,7 @@ pub mod test_utils {
             max_gas: None,
             gas_price: GasPrice::new(0.001, "uatom".to_string()),
             gas_adjustment: None,
+            fee_granter: None,
             max_msg_num: Default::default(),
             max_tx_size: Default::default(),
             clock_drift: Duration::from_secs(5),