http2: allow passing FileHandle to respondWithFD

This seems to make sense if we want to promote the use
of `fs.promises`, although it’s not strictly necessary.

PR-URL: https://github.com/nodejs/node/pull/29876
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

3 files changed, 36 insertions, 28 deletions

diff --git a/lib/fs.js b/lib/fs.js
index 34517a17da..d5c7ea70d8 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -1964,7 +1964,7 @@ Object.defineProperties(fs, {
     enumerable: true,
     get() {
       if (promises === null)
-        promises = require('internal/fs/promises');
+        promises = require('internal/fs/promises').exports;
       return promises;
     }
   }
diff --git a/lib/internal/fs/promises.js b/lib/internal/fs/promises.js
index 7660ff66be..31613780a7 100644
--- a/lib/internal/fs/promises.js
+++ b/lib/internal/fs/promises.js
@@ -46,7 +46,7 @@ const {
 const pathModule = require('path');
 const { promisify } = require('internal/util');
 
-const kHandle = Symbol('handle');
+const kHandle = Symbol('kHandle');
 const { kUsePromises } = binding;
 
 const getDirectoryEntriesPromise = promisify(getDirents);
@@ -507,29 +507,33 @@ async function readFile(path, options) {
 }
 
 module.exports = {
-  access,
-  copyFile,
-  open,
-  opendir: promisify(opendir),
-  rename,
-  truncate,
-  rmdir,
-  mkdir,
-  readdir,
-  readlink,
-  symlink,
-  lstat,
-  stat,
-  link,
-  unlink,
-  chmod,
-  lchmod,
-  lchown,
-  chown,
-  utimes,
-  realpath,
-  mkdtemp,
-  writeFile,
-  appendFile,
-  readFile
+  exports: {
+    access,
+    copyFile,
+    open,
+    opendir: promisify(opendir),
+    rename,
+    truncate,
+    rmdir,
+    mkdir,
+    readdir,
+    readlink,
+    symlink,
+    lstat,
+    stat,
+    link,
+    unlink,
+    chmod,
+    lchmod,
+    lchown,
+    chown,
+    utimes,
+    realpath,
+    mkdtemp,
+    writeFile,
+    appendFile,
+    readFile,
+  },
+
+  FileHandle
 };
diff --git a/lib/internal/http2/core.js b/lib/internal/http2/core.js
index d2701dfb84..11d677c5f6 100644
--- a/lib/internal/http2/core.js
+++ b/lib/internal/http2/core.js
@@ -82,6 +82,7 @@ const {
   hideStackFrames
 } = require('internal/errors');
 const { validateNumber, validateString } = require('internal/validators');
+const fsPromisesInternal = require('internal/fs/promises');
 const { utcDate } = require('internal/http');
 const { onServerStream,
         Http2ServerRequest,
@@ -2523,7 +2524,10 @@ class ServerHttp2Stream extends Http2Stream {
       this[kState].flags |= STREAM_FLAGS_HAS_TRAILERS;
     }
 
-    validateNumber(fd, 'fd');
+    if (fd instanceof fsPromisesInternal.FileHandle)
+      fd = fd.fd;
+    else if (typeof fd !== 'number')
+      throw new ERR_INVALID_ARG_TYPE('fd', ['number', 'FileHandle'], fd);
 
     debugStreamObj(this, 'initiating response from fd');
     this[kUpdateTimer]();