errors: provide defaults for unmapped uv errors

libuv does not map 100% of errors. When an unmapped error is
encountered, the Map returns undefined, which is then
unsuccessfully destructured, causing an exception. This commit
adds a default value in the event of an unmapped error.

PR-URL: https://github.com/nodejs/node/pull/29288
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 26 insertions, 0 deletions

diff --git a/test/parallel/test-uv-unmapped-exception.js b/test/parallel/test-uv-unmapped-exception.js
new file mode 100644
index 0000000000..0b63461dd2
--- /dev/null
+++ b/test/parallel/test-uv-unmapped-exception.js
@@ -0,0 +1,26 @@
+// Flags: --expose-internals
+'use strict';
+require('../common');
+const assert = require('assert');
+const { uvException, uvExceptionWithHostPort } = require('internal/errors');
+
+{
+  const exception = uvException({ errno: 100, syscall: 'open' });
+
+  assert.strictEqual(exception.message, 'UNKNOWN: unknown error, open');
+  assert.strictEqual(exception.errno, 100);
+  assert.strictEqual(exception.syscall, 'open');
+  assert.strictEqual(exception.code, 'UNKNOWN');
+}
+
+{
+  const exception = uvExceptionWithHostPort(100, 'listen', '127.0.0.1', 80);
+
+  assert.strictEqual(exception.message,
+                     'listen UNKNOWN: unknown error 127.0.0.1:80');
+  assert.strictEqual(exception.code, 'UNKNOWN');
+  assert.strictEqual(exception.errno, 100);
+  assert.strictEqual(exception.syscall, 'listen');
+  assert.strictEqual(exception.address, '127.0.0.1');
+  assert.strictEqual(exception.port, 80);
+}