nonce: Unify NonceError with SystemError

client/src/client_error.rs

@@ -1,5 +1,5 @@
 use {
-    crate::rpc_request,
+    crate::{rpc_request, rpc_response},
     solana_faucet::faucet::FaucetError,
     solana_sdk::{
         signature::SignerError, transaction::TransactionError, transport::TransportError,
@@ -30,6 +30,24 @@ pub enum ClientErrorKind {
     Custom(String),
 }
 
+impl ClientErrorKind {
+    pub fn get_transaction_error(&self) -> Option<TransactionError> {
+        match self {
+            Self::RpcError(rpc_request::RpcError::RpcResponseError {
+                data:
+                    rpc_request::RpcResponseErrorData::SendTransactionPreflightFailure(
+                        rpc_response::RpcSimulateTransactionResult {
+                            err: Some(tx_err), ..
+                        },
+                    ),
+                ..
+            }) => Some(tx_err.clone()),
+            Self::TransactionError(tx_err) => Some(tx_err.clone()),
+            _ => None,
+        }
+    }
+}
+
 impl From<TransportError> for ClientErrorKind {
     fn from(err: TransportError) -> Self {
         match err {
@@ -86,6 +104,10 @@ impl ClientError {
     pub fn kind(&self) -> &ClientErrorKind {
         &self.kind
     }
+
+    pub fn get_transaction_error(&self) -> Option<TransactionError> {
+        self.kind.get_transaction_error()
+    }
 }
 
 impl From<ClientErrorKind> for ClientError {