From 2b24ffae2240163a74ae11e49ee198e98abb07dc Mon Sep 17 00:00:00 2001
From: Joyee Cheung <joyeec9h3@gmail.com>
Date: Thu, 18 Apr 2019 12:25:57 +0800
Subject: lib: print to stdout/stderr directly instead of using console

This patch adds an internal function that prints to stdout or
stderr by directly writing to the known file descriptor, and
uses it internally in common cases to avoid the overhead
of the console implementation.

PR-URL: https://github.com/nodejs/node/pull/27320
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 lib/internal/fs/utils.js | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'lib/internal/fs')

diff --git a/lib/internal/fs/utils.js b/lib/internal/fs/utils.js
index ca8328f553..dde78654e0 100644
--- a/lib/internal/fs/utils.js
+++ b/lib/internal/fs/utils.js
@@ -12,7 +12,8 @@ const {
     ERR_INVALID_OPT_VALUE_ENCODING,
     ERR_OUT_OF_RANGE
   },
-  hideStackFrames
+  hideStackFrames,
+  uvException
 } = require('internal/errors');
 const {
   isUint8Array,
@@ -444,7 +445,26 @@ function warnOnNonPortableTemplate(template) {
   }
 }
 
+// This handles errors following the convention of the fs binding.
+function handleErrorFromBinding(ctx) {
+  if (ctx.errno !== undefined) {  // libuv error numbers
+    const err = uvException(ctx);
+    // eslint-disable-next-line no-restricted-syntax
+    Error.captureStackTrace(err, handleErrorFromBinding);
+    throw err;
+  }
+  if (ctx.error !== undefined) {  // Errors created in C++ land.
+    // TODO(joyeecheung): currently, ctx.error are encoding errors
+    // usually caused by memory problems. We need to figure out proper error
+    // code(s) for this.
+    // eslint-disable-next-line no-restricted-syntax
+    Error.captureStackTrace(ctx.error, handleErrorFromBinding);
+    throw ctx.error;
+  }
+}
+
 module.exports = {
+  handleErrorFromBinding,
   assertEncoding,
   copyObject,
   Dirent,
-- 
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