fs: improve error performance of symlinkSync

PR-URL: #49962
Refs: nodejs/performance#106
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Stephen Belanger <[email protected]>
Reviewed-By: Vinícius Lourenço Claro Cardoso <[email protected]>

Author: anonrig

benchmark/fs/bench-symlinkSync.js

@@ -0,0 +1,51 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+
+if (process.platform === 'win32') {
+  console.log('Skipping: Windows does not play well with `symlink`');
+  process.exit(0);
+}
+
+const bench = common.createBenchmark(main, {
+  type: ['valid', 'invalid'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  switch (type) {
+    case 'valid': {
+      tmpdir.refresh();
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fs.symlinkSync(tmpdir.resolve('.non-existent-symlink-file'), tmpdir.resolve(`.valid-${i}`), 'file');
+      }
+      bench.end(n);
+      break;
+    }
+
+    case 'invalid': {
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.symlinkSync(
+            tmpdir.resolve('.non-existent-symlink-file'),
+            __filename,
+            'file',
+          );
+        } catch {
+          hasError = true;
+        }
+      }
+      bench.end(n);
+      assert(hasError);
+      break;
+    }
+    default:
+      new Error('Invalid type');
+  }
+}

lib/fs.js

@@ -1802,13 +1802,12 @@ function symlinkSync(target, path, type) {
   }
   target = getValidatedPath(target, 'target');
   path = getValidatedPath(path);
-  const flags = stringToSymlinkType(type);
-
-  const ctx = { path: target, dest: path };
-  binding.symlink(preprocessSymlinkDestination(target, type, path),
-                  pathModule.toNamespacedPath(path), flags, undefined, ctx);
 
-  handleErrorFromBinding(ctx);
+  binding.symlink(
+    preprocessSymlinkDestination(target, type, path),
+    pathModule.toNamespacedPath(path),
+    stringToSymlinkType(type),
+  );
 }
 
 /**

src/node_file.cc

@@ -1333,7 +1333,7 @@ static void Symlink(const FunctionCallbackInfo<Value>& args) {
   Isolate* isolate = env->isolate();
 
   const int argc = args.Length();
-  CHECK_GE(argc, 4);
+  CHECK_GE(argc, 3);
 
   BufferValue target(isolate, args[0]);
   CHECK_NOT_NULL(*target);
@@ -1352,8 +1352,8 @@ static void Symlink(const FunctionCallbackInfo<Value>& args) {
   CHECK(args[2]->IsInt32());
   int flags = args[2].As<Int32>()->Value();
 
-  FSReqBase* req_wrap_async = GetReqWrap(args, 3);
-  if (req_wrap_async != nullptr) {  // symlink(target, path, flags, req)
+  if (argc > 3) {  // symlink(target, path, flags, req)
+    FSReqBase* req_wrap_async = GetReqWrap(args, 3);
     FS_ASYNC_TRACE_BEGIN2(UV_FS_SYMLINK,
                           req_wrap_async,
                           "target",
@@ -1363,11 +1363,10 @@ static void Symlink(const FunctionCallbackInfo<Value>& args) {
     AsyncDestCall(env, req_wrap_async, args, "symlink", *path, path.length(),
                   UTF8, AfterNoArgs, uv_fs_symlink, *target, *path, flags);
   } else {  // symlink(target, path, flags, undefined, ctx)
-    CHECK_EQ(argc, 5);
-    FSReqWrapSync req_wrap_sync;
+    FSReqWrapSync req_wrap_sync("symlink", *target, *path);
     FS_SYNC_TRACE_BEGIN(symlink);
-    SyncCall(env, args[4], &req_wrap_sync, "symlink",
-             uv_fs_symlink, *target, *path, flags);
+    SyncCallAndThrowOnError(
+        env, &req_wrap_sync, uv_fs_symlink, *target, *path, flags);
     FS_SYNC_TRACE_END(symlink);
   }
 }

typings/internalBinding/fs.d.ts

@@ -206,6 +206,7 @@ declare namespace InternalFSBinding {
   function symlink(target: StringOrBuffer, path: StringOrBuffer, type: number, req: FSReqCallback): void;
   function symlink(target: StringOrBuffer, path: StringOrBuffer, type: number, req: undefined, ctx: FSSyncContext): void;
   function symlink(target: StringOrBuffer, path: StringOrBuffer, type: number, usePromises: typeof kUsePromises): Promise<void>;
+  function symlink(target: StringOrBuffer, path: StringOrBuffer, type: number): void;
 
   function unlink(path: string, req: FSReqCallback): void;
   function unlink(path: string): void;