Feat/code command (#99)

* Replace local `auth` module with `ethrex_rpc::clients::auth` module & fix compilation

* Add command mock

* Add get code code

* Add block option

* Update readme

---------

Co-authored-by: ilitteri <ilitteri@fi.uba.ar>
Co-authored-by: Ivan Litteri <67517699+ilitteri@users.noreply.github.com>

Author: mechanix97

README.md

@@ -43,6 +43,7 @@ Commands:
   call          Make a call to a contract
   chain-id      Get the network's chain id.
   deploy        Deploy a contract
+  code          Returns code at a given address
   hash          Get either the keccak for a given input, the zero hash, the empty string, or a random hash [aliases: h, h]
   l2            L2 specific commands.
   nonce         Get the account's nonce. [aliases: n]

cli/src/cli.rs

@@ -90,6 +90,20 @@ pub(crate) enum Command {
         #[arg(default_value = "http://localhost:8545", env = "RPC_URL")]
         rpc_url: String,
     },
+    #[clap(about = "Returns code at a given address")]
+    Code {
+        address: Address,
+        #[arg(
+            short = 'B',
+            long = "block",
+            required = false,
+            default_value_t = String::from("latest"),
+            help = "defaultBlock parameter: can be integer block number, 'earliest', 'finalized', 'safe', 'latest' or 'pending'"
+        )]
+        block: String,
+        #[arg(default_value = "http://localhost:8545", env = "RPC_URL")]
+        rpc_url: String,
+    },
     #[clap(about = "Deploy a contract")]
     Deploy {
         #[clap(flatten)]
@@ -407,6 +421,17 @@ impl Command {
                     println!("{chain_id}");
                 }
             }
+            Command::Code {
+                address,
+                block,
+                rpc_url,
+            } => {
+                let eth_client = EthClient::new(&rpc_url);
+
+                let code = eth_client.get_code(address, block).await?;
+
+                println!("{}", code);
+            }
         };
         Ok(())
     }

sdk/src/client/eth/mod.rs

@@ -1076,6 +1076,29 @@ impl EthClient {
             "Transaction receipt is None".to_owned(),
         ))
     }
+
+    pub async fn get_code(
+        &self,
+        address: Address,
+        block: String,
+    ) -> Result<String, EthClientError> {
+        let request = RpcRequest {
+            id: RpcRequestId::Number(1),
+            jsonrpc: "2.0".to_string(),
+            method: "eth_getCode".to_string(),
+            params: Some(vec![json!(address), json!(block)]),
+        };
+
+        match self.send_request(request).await {
+            Ok(RpcResponse::Success(result)) => serde_json::from_value(result.result)
+                .map_err(SendRawTransactionError::SerdeJSONError)
+                .map_err(EthClientError::from),
+            Ok(RpcResponse::Error(error_response)) => {
+                Err(SendRawTransactionError::RPCError(error_response.error.message).into())
+            }
+            Err(error) => Err(error),
+        }
+    }
 }
 
 pub fn from_hex_string_to_u256(hex_str: &str) -> Result<U256, EthClientError> {