From e7b7c15198a9e8e48db93128fa1bf36945dba4d0 Mon Sep 17 00:00:00 2001
From: Justin Starry <justin@solana.com>
Date: Thu, 29 Oct 2020 08:59:16 +0800
Subject: [PATCH] feat: print program logs when transaction send fails (#13213)

---
 web3.js/src/connection.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/web3.js/src/connection.js b/web3.js/src/connection.js
index 9ffbce2a89..e881122194 100644
--- a/web3.js/src/connection.js
+++ b/web3.js/src/connection.js
@@ -2947,6 +2947,14 @@ export class Connection {
     const unsafeRes = await this._rpcRequest('sendTransaction', args);
     const res = SendTransactionRpcResult(unsafeRes);
     if (res.error) {
+      if (res.error.data) {
+        const logs = res.error.data.logs;
+        if (logs && Array.isArray(logs)) {
+          const traceIndent = '\n    ';
+          const logTrace = traceIndent + logs.join(traceIndent);
+          console.error(res.error.message, logTrace);
+        }
+      }
       throw new Error('failed to send transaction: ' + res.error.message);
     }
     assert(typeof res.result !== 'undefined');