Client: Print the error kind on simulation failure (#462)

client/src/client.rs

@@ -26,6 +26,7 @@ use solana_client::nonblocking::rpc_client::RpcClient as RpcClientAsync;
 use solana_sdk::address_lookup_table_account::AddressLookupTableAccount;
 use solana_sdk::hash::Hash;
 use solana_sdk::signer::keypair;
+use solana_sdk::transaction::TransactionError;
 
 use crate::account_fetcher::*;
 use crate::context::{MangoGroupContext, Serum3MarketContext, TokenContext};
@@ -1474,8 +1475,13 @@ struct Serum3Data<'a> {
 
 #[derive(Debug, thiserror::Error)]
 pub enum MangoClientError {
-    #[error("Transaction simulation error. Logs: {logs}")]
-    SendTransactionPreflightFailure { logs: String },
+    #[error("Transaction simulation error. Error: {err:?}, Logs: {}",
+        .logs.iter().join("; ")
+    )]
+    SendTransactionPreflightFailure {
+        err: Option<TransactionError>,
+        logs: Vec<String>,
+    },
 }
 
 pub struct TransactionBuilder<'a> {
@@ -1552,13 +1558,12 @@ pub fn prettify_solana_client_error(
     match err.kind() {
         ClientErrorKind::RpcError(RpcError::RpcResponseError { data, .. }) => match data {
             RpcResponseErrorData::SendTransactionPreflightFailure(s) => {
-                if let Some(logs) = s.logs.as_ref() {
                 return MangoClientError::SendTransactionPreflightFailure {
-                        logs: logs.iter().join("; "),
+                    err: s.err.clone(),
+                    logs: s.logs.clone().unwrap_or_default(),
                 }
                 .into();
             }
-            }
             _ => {}
         },
         _ => {}

liquidator/src/main.rs

@@ -488,8 +488,12 @@ impl LiquidationState {
             // Simulation errors due to liqee precondition failures on the liquidation instructions
             // will commonly happen if our liquidator is late or if there are chain forks.
             match err.downcast_ref::<client::MangoClientError>() {
-                Some(client::MangoClientError::SendTransactionPreflightFailure { logs }) => {
-                    if logs.contains("HealthMustBeNegative") || logs.contains("IsNotBankrupt") {
+                Some(client::MangoClientError::SendTransactionPreflightFailure {
+                    logs, ..
+                }) => {
+                    if logs.iter().any(|line| {
+                        line.contains("HealthMustBeNegative") || line.contains("IsNotBankrupt")
+                    }) {
                         log_level = log::Level::Trace;
                     }
                 }