fixup! fixup! fixup! src: set UV_THREADPOOL_SIZE based on available parallelism

Author: RafaelGSS

src/node.cc

@@ -1242,7 +1242,8 @@ InitializeOncePerProcessInternal(const std::vector<std::string>& args,
     char buf[64];
     size_t buf_size = sizeof(buf);
     int rc = uv_os_getenv("UV_THREADPOOL_SIZE", buf, &buf_size);
-    if (rc == UV_ENOENT) {
+    if (rc == UV_ENOENT &&
+        !per_process::dotenv_file.HasKey("UV_THREADPOOL_SIZE")) {
       unsigned int parallelism = uv_available_parallelism();
       unsigned int threadpool_size = std::min(std::max(4u, parallelism), 1024u);
       char size_str[16];

src/node_dotenv.cc

@@ -352,6 +352,10 @@ Dotenv::ParseResult Dotenv::ParsePath(const std::string_view path) {
   return ParseResult::Valid;
 }
 
+bool Dotenv::HasKey(const std::string_view key) const {
+  return store_.contains(std::string(key));
+}
+
 void Dotenv::AssignNodeOptionsIfAvailable(std::string* node_options) const {
   auto match = store_.find("NODE_OPTIONS");
 

src/node_dotenv.h

@@ -28,6 +28,7 @@ class Dotenv {
   void ParseContent(const std::string_view content);
   ParseResult ParsePath(const std::string_view path);
   void AssignNodeOptionsIfAvailable(std::string* node_options) const;
+  bool HasKey(const std::string_view key) const;
   v8::Maybe<void> SetEnvironment(Environment* env);
   v8::MaybeLocal<v8::Object> ToObject(Environment* env) const;