feat(ext/node): embed std/node into the snapshot (#17724)

This commit moves "deno_std/node" in "ext/node" crate. The code is
transpiled and snapshotted during the build process.

During the first pass a minimal amount of work was done to create the
snapshot, a lot of code in "ext/node" depends on presence of "Deno"
global. This code will be gradually fixed in the follow up PRs to migrate
it to import relevant APIs from "internal:" modules.

Currently the code from snapshot is not used in any way, and all
Node/npm compatibility still uses code from 
"https://deno.land/std/node" (or from the location specified by 
"DENO_NODE_COMPAT_URL"). This will also be handled in a follow 
up PRs.

---------

Co-authored-by: crowlkats <crowlkats@toaxl.com>
Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>
Co-authored-by: Yoshiya Hinosawa <stibium121@gmail.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/ext/node/polyfills/_fs/_fs_writev.mjs b/ext/node/polyfills/_fs/_fs_writev.mjs
new file mode 100644
index 000000000..ffc67c81a
--- /dev/null
+++ b/ext/node/polyfills/_fs/_fs_writev.mjs
@@ -0,0 +1,81 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.
+import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
+import { validateBufferArray } from "internal:deno_node/polyfills/internal/fs/utils.mjs";
+import { getValidatedFd } from "internal:deno_node/polyfills/internal/fs/utils.mjs";
+import { maybeCallback } from "internal:deno_node/polyfills/_fs/_fs_common.ts";
+
+export function writev(fd, buffers, position, callback) {
+  const innerWritev = async (fd, buffers, position) => {
+    const chunks = [];
+    const offset = 0;
+    for (let i = 0; i < buffers.length; i++) {
+      if (Buffer.isBuffer(buffers[i])) {
+        chunks.push(buffers[i]);
+      } else {
+        chunks.push(Buffer.from(buffers[i]));
+      }
+    }
+    if (typeof position === "number") {
+      await Deno.seekSync(fd, position, Deno.SeekMode.Start);
+    }
+    const buffer = Buffer.concat(chunks);
+    let currentOffset = 0;
+    while (currentOffset < buffer.byteLength) {
+      currentOffset += await Deno.writeSync(fd, buffer.subarray(currentOffset));
+    }
+    return currentOffset - offset;
+  };
+
+  fd = getValidatedFd(fd);
+  validateBufferArray(buffers);
+  callback = maybeCallback(callback || position);
+
+  if (buffers.length === 0) {
+    process.nextTick(callback, null, 0, buffers);
+    return;
+  }
+
+  if (typeof position !== "number") position = null;
+
+  innerWritev(fd, buffers, position).then(
+    (nwritten) => {
+      callback(null, nwritten, buffers);
+    },
+    (err) => callback(err),
+  );
+}
+
+export function writevSync(fd, buffers, position) {
+  const innerWritev = (fd, buffers, position) => {
+    const chunks = [];
+    const offset = 0;
+    for (let i = 0; i < buffers.length; i++) {
+      if (Buffer.isBuffer(buffers[i])) {
+        chunks.push(buffers[i]);
+      } else {
+        chunks.push(Buffer.from(buffers[i]));
+      }
+    }
+    if (typeof position === "number") {
+      Deno.seekSync(fd, position, Deno.SeekMode.Start);
+    }
+    const buffer = Buffer.concat(chunks);
+    let currentOffset = 0;
+    while (currentOffset < buffer.byteLength) {
+      currentOffset += Deno.writeSync(fd, buffer.subarray(currentOffset));
+    }
+    return currentOffset - offset;
+  };
+
+  fd = getValidatedFd(fd);
+  validateBufferArray(buffers);
+
+  if (buffers.length === 0) {
+    return 0;
+  }
+
+  if (typeof position !== "number") position = null;
+
+  return innerWritev(fd, buffers, position);
+}