From 583ea5ba9ece025fedf18fe25fcddd3fcead395c Mon Sep 17 00:00:00 2001
From: Gandalf <gandalf@storm.pl>
Date: Sun, 7 Dec 2025 21:23:40 +0100
Subject: [PATCH] Add p-limit to serialize WASM chain access

Prevent WASM memory corruption from concurrent calls to the shared
wax chain instance. WASM modules are not thread-safe, and concurrent
access from Next.js Server Components can cause "memory access out of
bounds" errors.

Uses p-limit(1) to serialize all getChain() calls, ensuring only one
WASM operation runs at a time.
---
 packages/transaction/lib/chain.ts | 13 +++++++++++--
 packages/transaction/package.json |  1 +
 pnpm-lock.yaml                    |  3 +++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/packages/transaction/lib/chain.ts b/packages/transaction/lib/chain.ts
index a73f33453..a3f23bcac 100644
--- a/packages/transaction/lib/chain.ts
+++ b/packages/transaction/lib/chain.ts
@@ -1,10 +1,19 @@
 import type { ExtendedNodeApi, ExtendedRestApi } from './extended-hive.chain';
 import { hiveChainService } from './hive-chain-service';
 import { TWaxExtended, TWaxRestExtended } from '@hiveio/wax';
+import pLimit from 'p-limit';
 
 let chain: TWaxExtended<ExtendedNodeApi, TWaxRestExtended<ExtendedRestApi>> | undefined = undefined;
 
+// Serialize access to wax chain instance to prevent WASM memory corruption
+// from concurrent calls. WASM modules are not thread-safe, and concurrent
+// access (e.g., from Next.js Server Components) can cause "memory access
+// out of bounds" errors.
+const wasmLock = pLimit(1);
+
 export async function getChain() {
-  if (!chain) chain = await hiveChainService.getHiveChain();
-  return chain;
+  return wasmLock(async () => {
+    if (!chain) chain = await hiveChainService.getHiveChain();
+    return chain;
+  });
 }
diff --git a/packages/transaction/package.json b/packages/transaction/package.json
index 276cb3303..ab2603183 100644
--- a/packages/transaction/package.json
+++ b/packages/transaction/package.json
@@ -10,6 +10,7 @@
     "@hive/smart-signer": "workspace:*",
     "@hiveio/wax": "catalog:hiveio-toolset",
     "@hiveio/workerbee": "catalog:hiveio-toolset",
+    "p-limit": "^3.1.0",
     "secure-random": "^1.1.2",
     "set-interval-async": "^3.0.3",
     "speakingurl": "^14.0.1"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ca2e6787d..8ff15f770 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -789,6 +789,9 @@ importers:
       '@hiveio/workerbee':
         specifier: catalog:hiveio-toolset
         version: 1.28.4-rc0
+      p-limit:
+        specifier: ^3.1.0
+        version: 3.1.0
       secure-random:
         specifier: ^1.1.2
         version: 1.1.2
-- 
GitLab