test: return napi_exception_pending on throwing proxy handlers (#75)

packages/test/CMakeLists.txt

@@ -268,6 +268,7 @@ add_test("string" "./string/binding.c;./string/test_null.c" OFF)
 add_test("property" "./property/binding.c" OFF)
 add_test("promise" "./promise/binding.c" OFF)
 add_test("object" "./object/test_null.c;./object/test_object.c" OFF)
+add_test("object_exception" "./object/test_exceptions.c" OFF)
 add_test("objwrap" "./objwrap/myobject.cc" OFF)
 add_test("bigint" "./bigint/binding.c" OFF)
 add_test("fnwrap" "./fnwrap/myobject.cc;./fnwrap/binding.cc" OFF)

packages/test/common-inl.h

@@ -41,17 +41,34 @@ inline void add_last_status(napi_env env,
                             const char* key,
                             napi_value return_value) {
   napi_value prop_value;
+  napi_value exception;
   const napi_extended_error_info* p_last_error;
   NODE_API_CALL_RETURN_VOID(env, napi_get_last_error_info(env, &p_last_error));
+  // Content of p_last_error can be updated in subsequent node-api calls.
+  // Retrieve it immediately.
+  const char* error_message = p_last_error->error_message == NULL
+                                  ? "napi_ok"
+                                  : p_last_error->error_message;
+
+  bool is_exception_pending;
+  NODE_API_CALL_RETURN_VOID(
+      env, napi_is_exception_pending(env, &is_exception_pending));
+  if (is_exception_pending) {
+    NODE_API_CALL_RETURN_VOID(
+        env, napi_get_and_clear_last_exception(env, &exception));
+    char exception_key[50];
+#if !defined(__wasm__) || (defined(__EMSCRIPTEN__) || defined(__wasi__))
+    snprintf(exception_key, sizeof(exception_key), "%s%s", key, "Exception");
+#endif
+    NODE_API_CALL_RETURN_VOID(
+        env,
+        napi_set_named_property(env, return_value, exception_key, exception));
+  }
 
   NODE_API_CALL_RETURN_VOID(
       env,
       napi_create_string_utf8(
-          env,
-          (p_last_error->error_message == NULL ? "napi_ok"
-                                               : p_last_error->error_message),
-          NAPI_AUTO_LENGTH,
-          &prop_value));
+          env, error_message, NAPI_AUTO_LENGTH, &prop_value));
   NODE_API_CALL_RETURN_VOID(
       env, napi_set_named_property(env, return_value, key, prop_value));
 }

packages/test/object/object_exceptions.test.js

@@ -0,0 +1,22 @@
+/* eslint-disable symbol-description */
+/* eslint-disable camelcase */
+'use strict'
+const { load } = require('../util')
+const common = require('../common')
+
+module.exports = load('object_exception').then(test_object => {
+  const { testExceptions } = test_object
+
+  function throws () {
+    throw new Error('foobar')
+  }
+  testExceptions(new Proxy({}, {
+    get: common.mustCallAtLeast(throws, 1),
+    getOwnPropertyDescriptor: common.mustCallAtLeast(throws, 1),
+    defineProperty: common.mustCallAtLeast(throws, 1),
+    deleteProperty: common.mustCallAtLeast(throws, 1),
+    has: common.mustCallAtLeast(throws, 1),
+    set: common.mustCallAtLeast(throws, 1),
+    ownKeys: common.mustCallAtLeast(throws, 1)
+  }))
+})

packages/test/object/test_exceptions.c

@@ -0,0 +1,82 @@
+// #include <assert.h>
+#include <js_native_api.h>
+// #include <string.h>
+#include "../common.h"
+#include "../entry_point.h"
+
+static napi_value TestExceptions(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  napi_value target = args[0];
+  napi_value exception, key, value;
+  napi_status status;
+  bool is_exception_pending;
+  bool bool_result;
+
+  NODE_API_CALL(env,
+                napi_create_string_utf8(env, "key", NAPI_AUTO_LENGTH, &key));
+  NODE_API_CALL(
+      env, napi_create_string_utf8(env, "value", NAPI_AUTO_LENGTH, &value));
+
+#define PROCEDURE(call)                                                        \
+  {                                                                            \
+    status = (call);                                                           \
+    NODE_API_ASSERT(                                                           \
+        env, status == napi_pending_exception, "expect exception pending");    \
+    NODE_API_CALL(env, napi_is_exception_pending(env, &is_exception_pending)); \
+    NODE_API_ASSERT(env, is_exception_pending, "expect exception pending");    \
+    NODE_API_CALL(env, napi_get_and_clear_last_exception(env, &exception));    \
+  }
+  // discard the exception values.
+
+  // properties
+  PROCEDURE(napi_set_property(env, target, key, value));
+  PROCEDURE(napi_set_named_property(env, target, "key", value));
+  PROCEDURE(napi_has_property(env, target, key, &bool_result));
+  PROCEDURE(napi_has_own_property(env, target, key, &bool_result));
+  PROCEDURE(napi_has_named_property(env, target, "key", &bool_result));
+  PROCEDURE(napi_get_property(env, target, key, &value));
+  PROCEDURE(napi_get_named_property(env, target, "key", &value));
+  PROCEDURE(napi_delete_property(env, target, key, &bool_result));
+
+  // elements
+  PROCEDURE(napi_set_element(env, target, 0, value));
+  PROCEDURE(napi_has_element(env, target, 0, &bool_result));
+  PROCEDURE(napi_get_element(env, target, 0, &value));
+  PROCEDURE(napi_delete_element(env, target, 0, &bool_result));
+
+  napi_property_descriptor descriptors[] = {
+      DECLARE_NODE_API_PROPERTY_VALUE("key", value),
+  };
+  PROCEDURE(napi_define_properties(
+      env, target, sizeof(descriptors) / sizeof(*descriptors), descriptors));
+
+  PROCEDURE(napi_get_all_property_names(env,
+                                        target,
+                                        napi_key_own_only,
+                                        napi_key_enumerable,
+                                        napi_key_keep_numbers,
+                                        &value));
+  PROCEDURE(napi_get_property_names(env, target, &value));
+
+  return NULL;
+}
+
+EXTERN_C_START
+napi_value Init(napi_env env, napi_value exports) {
+  napi_property_descriptor descriptors[] = {
+      DECLARE_NODE_API_PROPERTY("testExceptions", TestExceptions),
+  };
+
+  NODE_API_CALL(
+      env,
+      napi_define_properties(env,
+                             exports,
+                             sizeof(descriptors) / sizeof(*descriptors),
+                             descriptors));
+
+  return exports;
+}
+EXTERN_C_END