fix(napi): return node globalThis from napi_get_global (#17613)

Fixes https://github.com/denoland/deno/issues/17587

cli/napi/js_native_api.rs

@@ -1718,12 +1718,12 @@ fn napi_get_element(
 #[napi_sym::napi_sym]
 fn napi_get_global(env: *mut Env, result: *mut napi_value) -> Result {
   check_env!(env);
-  let env = unsafe { &mut *env };
+  check_arg!(env, result);
 
-  let context = &mut env.scope().get_current_context();
-  let global = context.global(&mut env.scope());
-  let value: v8::Local<v8::Value> = global.into();
+  let value: v8::Local<v8::Value> =
+    transmute::<NonNull<v8::Value>, v8::Local<v8::Value>>((*env).global);
   *result = value.into();
+  napi_clear_last_error(env);
   Ok(())
 }
 

ext/napi/lib.rs

@@ -418,6 +418,7 @@ pub struct Env {
     Rc<RefCell<Vec<(extern "C" fn(*const c_void), *const c_void)>>>,
   pub tsfn_ref_counters: Arc<Mutex<ThreadsafeFunctionRefCounters>>,
   pub last_error: napi_extended_error_info,
+  pub global: NonNull<v8::Value>,
 }
 
 unsafe impl Send for Env {}
@@ -427,6 +428,7 @@ impl Env {
   pub fn new(
     isolate_ptr: *mut v8::OwnedIsolate,
     context: v8::Global<v8::Context>,
+    global: v8::Global<v8::Value>,
     sender: mpsc::UnboundedSender<PendingNapiAsyncWork>,
     threadsafe_function_sender: mpsc::UnboundedSender<ThreadSafeFunctionStatus>,
     cleanup_hooks: Rc<
@@ -446,6 +448,7 @@ impl Env {
     Self {
       isolate_ptr,
       context: context.into_raw(),
+      global: global.into_raw(),
       shared: std::ptr::null_mut(),
       open_handle_scopes: 0,
       async_work_sender: sender,
@@ -602,6 +605,7 @@ fn op_napi_open<NP, 'scope>(
   scope: &mut v8::HandleScope<'scope>,
   op_state: &mut OpState,
   path: String,
+  global: serde_v8::Value,
 ) -> std::result::Result<serde_v8::Value<'scope>, AnyError>
 where
   NP: NapiPermissions + 'static,
@@ -644,6 +648,7 @@ where
   let mut env = Env::new(
     isolate_ptr,
     v8::Global::new(scope, ctx),
+    v8::Global::new(scope, global.v8_value),
     async_work_sender,
     tsfn_sender,
     cleanup_hooks,

ext/node/02_require.js

@@ -804,7 +804,7 @@
     if (filename.endsWith("fsevents.node")) {
       throw new Error("Using fsevents module is currently not supported");
     }
-    module.exports = ops.op_napi_open(filename);
+    module.exports = ops.op_napi_open(filename, node.globalThis);
   };
 
   function createRequireFromPath(filename) {

test_napi/common.js

@@ -17,5 +17,9 @@ const [libPrefix, libSuffix] = {
 
 export function loadTestLibrary() {
   const specifier = `${targetDir}/${libPrefix}test_napi.${libSuffix}`;
-  return Deno[Deno.internal].core.ops.op_napi_open(specifier); // Internal, used in ext/node
+
+  // Internal, used in ext/node
+  return Deno[Deno.internal].core.ops.op_napi_open(specifier, {
+    Buffer: {},
+  });
 }

test_napi/env_test.js

@@ -0,0 +1,12 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+import { assert, loadTestLibrary } from "./common.js";
+
+const env = loadTestLibrary();
+
+Deno.test("napi get global", function () {
+  const g = env.testNodeGlobal();
+  // Note: global is a mock object in the tests.
+  // See common.js
+  assert(g.Buffer);
+});

test_napi/src/env.rs

@@ -0,0 +1,39 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+use crate::assert_napi_ok;
+use crate::napi_get_callback_info;
+use crate::napi_new_property;
+use napi_sys::*;
+
+extern "C" fn get_node_global(
+  env: napi_env,
+  info: napi_callback_info,
+) -> napi_value {
+  let (_, argc, _) = napi_get_callback_info!(env, info, 0);
+  assert_eq!(argc, 0);
+
+  let mut result: napi_value = std::ptr::null_mut();
+  assert_napi_ok!(napi_get_global(env, &mut result));
+
+  let mut r1: napi_value = std::ptr::null_mut();
+  assert_napi_ok!(napi_get_named_property(
+    env,
+    result,
+    "Buffer\0".as_ptr() as _,
+    &mut r1
+  ));
+
+  result
+}
+
+pub fn init(env: napi_env, exports: napi_value) {
+  let properties =
+    &[napi_new_property!(env, "testNodeGlobal", get_node_global)];
+
+  assert_napi_ok!(napi_define_properties(
+    env,
+    exports,
+    properties.len(),
+    properties.as_ptr()
+  ));
+}

test_napi/src/lib.rs

@@ -12,6 +12,7 @@ pub mod r#async;
 pub mod callback;
 pub mod coerce;
 pub mod date;
+pub mod env;
 pub mod error;
 pub mod mem;
 pub mod numbers;
@@ -143,6 +144,7 @@ unsafe extern "C" fn napi_register_module_v1(
   typedarray::init(env, exports);
   arraybuffer::init(env, exports);
   array::init(env, exports);
+  env::init(env, exports);
   error::init(env, exports);
   primitives::init(env, exports);
   properties::init(env, exports);