net: migrate errors to internal/errors

Throw ERR_SOCKET_CLOSED and ERR_SERVER_NOT_RUNNING
instead of the old-style errors in net.js.

PR-URL: https://github.com/nodejs/node/pull/17766
Refs: https://github.com/nodejs/node/issues/17709
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/errors.md

@@ -1364,7 +1364,14 @@ Script execution was interrupted by `SIGINT` (For example, when Ctrl+C was press
 
 The [`server.listen()`][] method was called while a `net.Server` was already
 listening. This applies to all instances of `net.Server`, including HTTP, HTTPS,
-and HTTP/2 Server instances.
+and HTTP/2 `Server` instances.
+
+<a id="ERR_SERVER_NOT_RUNNING"></a>
+### ERR_SERVER_NOT_RUNNING
+
+The [`server.close()`][] method was called when a `net.Server` was not
+running. This applies to all instances of `net.Server`, including HTTP, HTTPS,
+and HTTP/2 `Server` instances.
 
 <a id="ERR_SOCKET_ALREADY_BOUND"></a>
 ### ERR_SOCKET_ALREADY_BOUND

lib/internal/errors.js

@@ -451,6 +451,7 @@ E('ERR_SCRIPT_EXECUTION_INTERRUPTED',
   'Script execution was interrupted by `SIGINT`.');
 E('ERR_SERVER_ALREADY_LISTEN',
   'Listen method has been called more than once without closing.');
+E('ERR_SERVER_NOT_RUNNING', 'Server is not running.');
 E('ERR_SOCKET_ALREADY_BOUND', 'Socket is already bound');
 E('ERR_SOCKET_BAD_BUFFER_SIZE', 'Buffer size must be a positive integer');
 E('ERR_SOCKET_BAD_PORT', 'Port should be > 0 and < 65536. Received %s.');

lib/net.js

@@ -744,7 +744,7 @@ Socket.prototype._writeGeneric = function(writev, data, encoding, cb) {
   this._unrefTimer();
 
   if (!this._handle) {
-    this.destroy(new Error('This socket is closed'), cb);
+    this.destroy(new errors.Error('ERR_SOCKET_CLOSED'), cb);
     return false;
   }
 
@@ -1645,7 +1645,7 @@ Server.prototype.close = function(cb) {
   if (typeof cb === 'function') {
     if (!this._handle) {
       this.once('close', function close() {
-        cb(new Error('Not running'));
+        cb(new errors.Error('ERR_SERVER_NOT_RUNNING'));
       });
     } else {
       this.once('close', cb);

test/parallel/test-http-unix-socket.js

@@ -58,8 +58,10 @@ server.listen(common.PIPE, common.mustCall(function() {
       assert.strictEqual(res.body, 'hello world\n');
       server.close(common.mustCall(function(error) {
         assert.strictEqual(error, undefined);
-        server.close(common.mustCall(function(error) {
+        server.close(common.expectsError({
-          assert.strictEqual(error && error.message, 'Not running');
+          code: 'ERR_SERVER_NOT_RUNNING',
+          message: 'Server is not running.',
+          type: Error
         }));
       }));
     }));

test/parallel/test-net-socket-destroy-send.js

@@ -12,11 +12,16 @@ server.listen(0, common.mustCall(function() {
   conn.on('connect', common.mustCall(function() {
     // Test destroy returns this, even on multiple calls when it short-circuits.
     assert.strictEqual(conn, conn.destroy().destroy());
-    conn.on('error', common.mustCall(function(err) {
+    conn.on('error', common.expectsError({
-      assert.strictEqual(err.message, 'This socket is closed');
+      code: 'ERR_SOCKET_CLOSED',
+      message: 'Socket is closed',
+      type: Error
     }));
-    conn.write(Buffer.from('kaboom'), common.mustCall(function(err) {
+
-      assert.strictEqual(err.message, 'This socket is closed');
+    conn.write(Buffer.from('kaboom'), common.expectsError({
+      code: 'ERR_SOCKET_CLOSED',
+      message: 'Socket is closed',
+      type: Error
     }));
     server.close();
   }));

test/parallel/test-net-socket-write-after-close.js

@@ -26,11 +26,14 @@ const net = require('net');
   server.listen(common.mustCall(() => {
     const port = server.address().port;
     const client = net.connect({ port }, common.mustCall(() => {
-      client.on('error', common.mustCall((err) => {
+      client.on('error', common.expectsError({
-        server.close();
+        code: 'ERR_SOCKET_CLOSED',
-        assert.strictEqual(err.constructor, Error);
+        message: 'Socket is closed',
-        assert.strictEqual(err.message, 'This socket is closed');
+        type: Error
       }));
+
+      server.close();
+
       client._handle.close();
       client._handle = null;
       client.write('foo');