process: move process.features initialization into node.js

Use `internalBinding('config')` to shim the legacy
`process.features`.

PR-URL: https://github.com/nodejs/node/pull/25239
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>

lib/internal/bootstrap/node.js

@@ -270,6 +270,24 @@ function startup() {
     'process.assert() is deprecated. Please use the `assert` module instead.',
     'DEP0100');
 
+  // TODO(joyeecheung): this property has not been well-maintained, should we
+  // deprecate it in favor of a better API?
+  const { isDebugBuild, hasOpenSSL } = internalBinding('config');
+  Object.defineProperty(process, 'features', {
+    enumerable: true,
+    writable: false,
+    configurable: false,
+    value: {
+      debug: isDebugBuild,
+      uv: true,
+      ipv6: true,  // TODO(bnoordhuis) ping libuv
+      tls_alpn: hasOpenSSL,
+      tls_sni: hasOpenSSL,
+      tls_ocsp: hasOpenSSL,
+      tls: hasOpenSSL
+    }
+  });
+
   const perf = internalBinding('performance');
   const {
     NODE_PERFORMANCE_MILESTONE_BOOTSTRAP_COMPLETE,

src/node.cc

@@ -801,49 +801,6 @@ static void OnMessage(Local<Message> message, Local<Value> error) {
   }
 }
 
-static Local<Object> GetFeatures(Environment* env) {
-  EscapableHandleScope scope(env->isolate());
-
-  Local<Object> obj = Object::New(env->isolate());
-#if defined(DEBUG) && DEBUG
-  Local<Value> debug = True(env->isolate());
-#else
-  Local<Value> debug = False(env->isolate());
-#endif  // defined(DEBUG) && DEBUG
-
-  obj->Set(env->context(),
-           FIXED_ONE_BYTE_STRING(env->isolate(), "debug"),
-           debug).FromJust();
-  obj->Set(env->context(),
-           FIXED_ONE_BYTE_STRING(env->isolate(), "uv"),
-           True(env->isolate())).FromJust();
-  // TODO(bnoordhuis) ping libuv
-  obj->Set(env->context(),
-           FIXED_ONE_BYTE_STRING(env->isolate(), "ipv6"),
-           True(env->isolate())).FromJust();
-
-#ifdef HAVE_OPENSSL
-  Local<Boolean> have_openssl = True(env->isolate());
-#else
-  Local<Boolean> have_openssl = False(env->isolate());
-#endif
-
-  obj->Set(env->context(),
-           FIXED_ONE_BYTE_STRING(env->isolate(), "tls_alpn"),
-           have_openssl).FromJust();
-  obj->Set(env->context(),
-           FIXED_ONE_BYTE_STRING(env->isolate(), "tls_sni"),
-           have_openssl).FromJust();
-  obj->Set(env->context(),
-           FIXED_ONE_BYTE_STRING(env->isolate(), "tls_ocsp"),
-           have_openssl).FromJust();
-  obj->Set(env->context(),
-           FIXED_ONE_BYTE_STRING(env->isolate(), "tls"),
-           have_openssl).FromJust();
-
-  return scope.Escape(obj);
-}
-
 void SetupProcessObject(Environment* env,
                         const std::vector<std::string>& args,
                         const std::vector<std::string>& exec_args) {
@@ -964,7 +921,6 @@ void SetupProcessObject(Environment* env,
 
   READONLY_PROPERTY(process, "pid",
                     Integer::New(env->isolate(), uv_os_getpid()));
-  READONLY_PROPERTY(process, "features", GetFeatures(env));
 
   CHECK(process->SetAccessor(env->context(),
                              FIXED_ONE_BYTE_STRING(env->isolate(), "ppid"),

src/node_config.cc

@@ -26,6 +26,18 @@ static void Initialize(Local<Object> target,
   Environment* env = Environment::GetCurrent(context);
   Isolate* isolate = env->isolate();
 
+#if defined(DEBUG) && DEBUG
+  READONLY_TRUE_PROPERTY(target, "isDebugBuild");
+#else
+  READONLY_FALSE_PROPERTY(target, "isDebugBuild");
+#endif  // defined(DEBUG) && DEBUG
+
+#if HAVE_OPENSSL
+  READONLY_TRUE_PROPERTY(target, "hasOpenSSL");
+#else
+  READONLY_FALSE_PROPERTY(target, "hasOpenSSL");
+#endif  // HAVE_OPENSSL
+
 #ifdef NODE_FIPS_MODE
   READONLY_TRUE_PROPERTY(target, "fipsMode");
   // TODO(addaleax): Use options parser variable instead.

src/util.h

@@ -546,8 +546,11 @@ inline v8::MaybeLocal<v8::Value> ToV8Value(v8::Local<v8::Context> context,
         .FromJust();                                                           \
   } while (0)
 
+#define READONLY_FALSE_PROPERTY(obj, name)                                     \
+  READONLY_PROPERTY(obj, name, v8::False(isolate))
+
 #define READONLY_TRUE_PROPERTY(obj, name)                                      \
-  READONLY_PROPERTY(obj, name, True(isolate))
+  READONLY_PROPERTY(obj, name, v8::True(isolate))
 
 #define READONLY_STRING_PROPERTY(obj, name, str)                               \
   READONLY_PROPERTY(obj, name, ToV8Value(context, str).ToLocalChecked())

test/parallel/test-process-features.js

@@ -0,0 +1,20 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+const keys = new Set(Object.keys(process.features));
+
+assert.deepStrictEqual(keys, new Set([
+  'debug',
+  'uv',
+  'ipv6',
+  'tls_alpn',
+  'tls_sni',
+  'tls_ocsp',
+  'tls'
+]));
+
+for (const key of keys) {
+  assert.strictEqual(typeof process.features[key], 'boolean');
+}