[faucet] enhance faucet's concurrent processing ability (MystenLabs#3700

)

* concurrency

* fix typo

* get rid of split coin

* metrics

* wrap up

crates/sui-faucet/Cargo.toml

@@ -18,10 +18,13 @@ serde = { version = "1.0.141", features = ["derive"] }
 tower = { version = "0.4.12", features = ["util", "timeout", "load-shed", "limit"] }
 tower-http = { version = "0.3.4", features = ["cors"] }
 http = { version = "0.2.8" }
-
+futures = "0.3.21"
 uuid = {version = "1.1.2", features = [ "v4", "fast-rng"]}
+prometheus = "0.13.1"
+scopeguard = "1.1"
 
 sui = { path = "../sui" }
+sui-node = { path = "../sui-node" }
 sui-json-rpc-types= { path = "../sui-json-rpc-types" }
 sui-types = { path = "../sui-types" }
 sui-config = { path = "../sui-config" }

crates/sui-faucet/src/faucet/mod.rs

@@ -52,30 +52,3 @@ impl From<&SuiParsedObject> for CoinInfo {
         }
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use test_utils::network::setup_network_and_wallet;
-
-    use super::*;
-
-    #[tokio::test]
-    async fn simple_faucet_basic_interface_should_work() {
-        let (_network, context, _address) = setup_network_and_wallet().await.unwrap();
-        let faucet = SimpleFaucet::new(context).await.unwrap();
-        test_basic_interface(faucet).await;
-    }
-
-    async fn test_basic_interface(faucet: impl Faucet) {
-        let recipient = SuiAddress::random_for_testing_only();
-        let amounts = vec![1, 2, 3];
-
-        let FaucetReceipt { sent } = faucet
-            .send(Uuid::new_v4(), recipient, &amounts)
-            .await
-            .unwrap();
-        let mut actual_amounts: Vec<u64> = sent.iter().map(|c| c.amount).collect();
-        actual_amounts.sort_unstable();
-        assert_eq!(actual_amounts, amounts);
-    }
-}