fs: improve error performance of linkSync

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-linkSync.js

@@ -0,0 +1,50 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+
+tmpdir.refresh();
+const tmpfile = tmpdir.resolve(`.bench-file-data-${Date.now()}`);
+fs.writeFileSync(tmpfile, 'bench-file', 'utf-8');
+
+const bench = common.createBenchmark(main, {
+  type: ['valid', 'invalid'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  switch (type) {
+    case 'valid': {
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fs.linkSync(tmpfile, tmpdir.resolve(`.valid-${i}`), 'file');
+      }
+      bench.end(n);
+
+      break;
+    }
+
+    case 'invalid': {
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.linkSync(
+            tmpdir.resolve(`.non-existing-file-for-linkSync-${i}`),
+            __filename,
+            'file',
+          );
+        } catch {
+          hasError = true;
+        }
+      }
+      bench.end(n);
+      assert(hasError);
+      break;
+    }
+    default:
+      new Error('Invalid type');
+  }
+}

lib/fs.js

@@ -1847,12 +1847,10 @@ function linkSync(existingPath, newPath) {
   existingPath = getValidatedPath(existingPath, 'existingPath');
   newPath = getValidatedPath(newPath, 'newPath');
 
-  const ctx = { path: existingPath, dest: newPath };
-  const result = binding.link(pathModule.toNamespacedPath(existingPath),
-                              pathModule.toNamespacedPath(newPath),
-                              undefined, ctx);
-  handleErrorFromBinding(ctx);
-  return result;
+  binding.link(
+    pathModule.toNamespacedPath(existingPath),
+    pathModule.toNamespacedPath(newPath),
+  );
 }
 
 /**

src/node_file.cc

@@ -1342,7 +1342,7 @@ static void Link(const FunctionCallbackInfo<Value>& args) {
   Isolate* isolate = env->isolate();
 
   const int argc = args.Length();
-  CHECK_GE(argc, 3);
+  CHECK_GE(argc, 2);
 
   BufferValue src(isolate, args[0]);
   CHECK_NOT_NULL(*src);
@@ -1360,8 +1360,8 @@ static void Link(const FunctionCallbackInfo<Value>& args) {
   THROW_IF_INSUFFICIENT_PERMISSIONS(
       env, permission::PermissionScope::kFileSystemWrite, dest_view);
 
-  FSReqBase* req_wrap_async = GetReqWrap(args, 2);
-  if (req_wrap_async != nullptr) {  // link(src, dest, req)
+  if (argc > 2) {  // link(src, dest, req)
+    FSReqBase* req_wrap_async = GetReqWrap(args, 2);
     FS_ASYNC_TRACE_BEGIN2(UV_FS_LINK,
                           req_wrap_async,
                           "src",
@@ -1371,11 +1371,9 @@ static void Link(const FunctionCallbackInfo<Value>& args) {
     AsyncDestCall(env, req_wrap_async, args, "link", *dest, dest.length(), UTF8,
                   AfterNoArgs, uv_fs_link, *src, *dest);
   } else {  // link(src, dest)
-    CHECK_EQ(argc, 4);
-    FSReqWrapSync req_wrap_sync;
+    FSReqWrapSync req_wrap_sync("link", *src, *dest);
     FS_SYNC_TRACE_BEGIN(link);
-    SyncCall(env, args[3], &req_wrap_sync, "link",
-             uv_fs_link, *src, *dest);
+    SyncCallAndThrowOnError(env, &req_wrap_sync, uv_fs_link, *src, *dest);
     FS_SYNC_TRACE_END(link);
   }
 }

typings/internalBinding/fs.d.ts

@@ -121,6 +121,7 @@ declare namespace InternalFSBinding {
   function link(existingPath: string, newPath: string, req: FSReqCallback): void;
   function link(existingPath: string, newPath: string, req: undefined, ctx: FSSyncContext): void;
   function link(existingPath: string, newPath: string, usePromises: typeof kUsePromises): Promise<void>;
+  function link(existingPath: string, newPath: string): void;
 
   function lstat(path: StringOrBuffer, useBigint: boolean, req: FSReqCallback<Float64Array | BigUint64Array>): void;
   function lstat(path: StringOrBuffer, useBigint: true, req: FSReqCallback<BigUint64Array>): void;