src: replace ToLocalChecked uses with ToLocal in node-file

Author: jasnell

src/node_file-inl.h

@@ -221,9 +221,15 @@ void FSReqPromise<AliasedBufferT>::Reject(v8::Local<v8::Value> reject) {
   finished_ = true;
   v8::HandleScope scope(env()->isolate());
   InternalCallbackScope callback_scope(this);
-  v8::Local<v8::Value> value =
-      object()->Get(env()->context(),
-                    env()->promise_string()).ToLocalChecked();
+  v8::Local<v8::Value> value;
+  if (!object()
+           ->Get(env()->context(), env()->promise_string())
+           .ToLocal(&value)) {
+    // If we hit this, getting the value from the object failed and
+    // an error was likely scheduled. We could try to reject the promise
+    // but let's just allow the error to propagate.
+    return;
+  }
   v8::Local<v8::Promise::Resolver> resolver = value.As<v8::Promise::Resolver>();
   USE(resolver->Reject(env()->context(), reject).FromJust());
 }
@@ -233,9 +239,13 @@ void FSReqPromise<AliasedBufferT>::Resolve(v8::Local<v8::Value> value) {
   finished_ = true;
   v8::HandleScope scope(env()->isolate());
   InternalCallbackScope callback_scope(this);
-  v8::Local<v8::Value> val =
-      object()->Get(env()->context(),
-                    env()->promise_string()).ToLocalChecked();
+  v8::Local<v8::Value> val;
+  if (!object()->Get(env()->context(), env()->promise_string()).ToLocal(&val)) {
+    // If we hit this, getting the value from the object failed and
+    // an error was likely scheduled. We could try to reject the promise
+    // but let's just allow the error to propagate.
+    return;
+  }
   v8::Local<v8::Promise::Resolver> resolver = val.As<v8::Promise::Resolver>();
   USE(resolver->Resolve(env()->context(), value).FromJust());
 }
@@ -255,9 +265,13 @@ void FSReqPromise<AliasedBufferT>::ResolveStatFs(const uv_statfs_t* stat) {
 template <typename AliasedBufferT>
 void FSReqPromise<AliasedBufferT>::SetReturnValue(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
-  v8::Local<v8::Value> val =
-      object()->Get(env()->context(),
-                    env()->promise_string()).ToLocalChecked();
+  v8::Local<v8::Value> val;
+  if (!object()->Get(env()->context(), env()->promise_string()).ToLocal(&val)) {
+    // If we hit this, getting the value from the object failed and
+    // an error was likely scheduled. We could try to reject the promise
+    // but let's just allow the error to propagate.
+    return;
+  }
   v8::Local<v8::Promise::Resolver> resolver = val.As<v8::Promise::Resolver>();
   args.GetReturnValue().Set(resolver->GetPromise());
 }

src/node_file.cc

@@ -438,7 +438,8 @@ MaybeLocal<Promise> FileHandle::ClosePromise() {
 
   auto maybe_resolver = Promise::Resolver::New(context);
   CHECK(!maybe_resolver.IsEmpty());
-  Local<Promise::Resolver> resolver = maybe_resolver.ToLocalChecked();
+  Local<Promise::Resolver> resolver;
+  if (!maybe_resolver.ToLocal(&resolver)) return {};
   Local<Promise> promise = resolver.As<Promise>();
 
   Local<Object> close_req_obj;
@@ -845,10 +846,12 @@ void AfterStringPath(uv_fs_t* req) {
                                req->path,
                                req_wrap->encoding(),
                                &error);
-    if (link.IsEmpty())
+    if (link.IsEmpty()) {
       req_wrap->Reject(error);
-    else
-      req_wrap->Resolve(link.ToLocalChecked());
+    } else {
+      Local<Value> val;
+      if (link.ToLocal(&val)) req_wrap->Resolve(val);
+    }
   }
 }
 
@@ -865,10 +868,12 @@ void AfterStringPtr(uv_fs_t* req) {
                                static_cast<const char*>(req->ptr),
                                req_wrap->encoding(),
                                &error);
-    if (link.IsEmpty())
+    if (link.IsEmpty()) {
       req_wrap->Reject(error);
-    else
-      req_wrap->Resolve(link.ToLocalChecked());
+    } else {
+      Local<Value> val;
+      if (link.ToLocal(&val)) req_wrap->Resolve(val);
+    }
   }
 }
 
@@ -2262,7 +2267,8 @@ static void WriteBuffers(const FunctionCallbackInfo<Value>& args) {
   MaybeStackBuffer<uv_buf_t> iovs(chunks->Length());
 
   for (uint32_t i = 0; i < iovs.length(); i++) {
-    Local<Value> chunk = chunks->Get(env->context(), i).ToLocalChecked();
+    Local<Value> chunk;
+    if (!chunks->Get(env->context(), i).ToLocal(&chunk)) return;
     CHECK(Buffer::HasInstance(chunk));
     iovs[i] = uv_buf_init(Buffer::Data(chunk), Buffer::Length(chunk));
   }
@@ -2602,8 +2608,12 @@ static void ReadFileUtf8(const FunctionCallbackInfo<Value>& args) {
   }
   FS_SYNC_TRACE_END(read);
 
-  args.GetReturnValue().Set(
-      ToV8Value(env->context(), result, isolate).ToLocalChecked());
+  Local<Value> val;
+  if (!ToV8Value(env->context(), result, isolate).ToLocal(&val)) {
+    return;
+  }
+
+  args.GetReturnValue().Set(val);
 }
 
 // Wrapper for readv(2).
@@ -2631,7 +2641,8 @@ static void ReadBuffers(const FunctionCallbackInfo<Value>& args) {
 
   // Init uv buffers from ArrayBufferViews
   for (uint32_t i = 0; i < iovs.length(); i++) {
-    Local<Value> buffer = buffers->Get(env->context(), i).ToLocalChecked();
+    Local<Value> buffer;
+    if (!buffers->Get(env->context(), i).ToLocal(&buffer)) return;
     CHECK(Buffer::HasInstance(buffer));
     iovs[i] = uv_buf_init(Buffer::Data(buffer), Buffer::Length(buffer));
   }