feat: Improve error message when trying to redeclare contract using sncast declare #3253

CHANGELOG.md

@@ -1341,3 +1341,9 @@ snforge_std = { git = "https://github.com/foundry-rs/starknet-foundry", tag = "v
 #### Added
 
 - Initial release
+
+### Cast
+
+#### Changed
+
+- Error in case of redeclaration was improved.

crates/sncast/src/response/errors.rs

@@ -2,6 +2,7 @@ use crate::{ErrorData, WaitForTransactionError, handle_rpc_error};
 use anyhow::anyhow;
 use console::style;
 use conversions::serde::serialize::CairoSerialize;
+use starknet_types_core::felt::Felt;
 
 use conversions::byte_array::ByteArray;
 
@@ -51,6 +52,8 @@ pub enum StarknetCommandError {
     WaitForTransactionError(#[from] WaitForTransactionError),
     #[error(transparent)]
     ProviderError(#[from] SNCastProviderError),
+    #[error("Contract with class hash {0} is already declared on Starknet.")]
+    ClassAlreadyDeclared(Felt),
 }
 
 #[must_use]

crates/sncast/src/starknet_commands/declare.rs

@@ -135,7 +135,9 @@ pub async fn declare(
                 class_hash: class_hash.into_(),
             }))
         }
-        Err(Provider(error)) => Err(StarknetCommandError::ProviderError(error.into())),
+        Err(Provider(ProviderError::StarknetError(StarknetError::ClassAlreadyDeclared))) => Err(
+            StarknetCommandError::ClassAlreadyDeclared(class_hash.into_()),
+        ),
         Err(error) => Err(anyhow!(format!("Unexpected error occurred: {error}")).into()),
     }
 }

crates/sncast/tests/e2e/declare.rs

@@ -245,7 +245,7 @@ async fn test_contract_already_declared() {
         output,
         indoc! {r"
         Command: declare
-        Error: Contract with the same class hash is already declared
+        Error: Contract with class hash 3108664225240562387851974058679424955795215347221665253736957753632123141297 is already declared on Starknet.
         "},
     );
 }