net: remove long deprecated server.connections property

The server.connections property was runtime deprecated in the
0.9 days. It was replaced with getConnections(). It is not
simply an alias for getConnections() because it fails to take
connections shared with forks into consideration. Let's not
keep it around forever and move it to end of life

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: #33647
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

Author: jasnell

doc/api/child_process.md

@@ -1379,9 +1379,8 @@ process.on('message', (m, socket) => {
 ```
 
 Once a socket has been passed to a child, the parent is no longer capable of
-tracking when the socket is destroyed. To indicate this, the `.connections`
-property becomes `null`. It is recommended not to use `.maxConnections` when
-this occurs.
+tracking when the socket is destroyed. It is recommended not to use
+`.maxConnections` when this occurs.
 
 It is also recommended that any `'message'` handlers in the child process
 verify that `socket` exists, as the connection may have been closed during the

doc/api/deprecations.md

@@ -481,6 +481,9 @@ This behavior has been removed.
 ### DEP0020: `Server.connections`
 <!-- YAML
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/33647
+    description: Server.connections has been removed.
   - version:
     - v4.8.6
     - v6.12.0
@@ -491,10 +494,10 @@ changes:
     description: Runtime deprecation.
 -->
 
-Type: Runtime
+Type: End-of-life
 
-The [`Server.connections`][] property is deprecated. Please use the
-[`Server.getConnections()`][] method instead.
+The `Server.connections` property was deprecated in Node.js v0.9.7 and has
+been removed. Please use the [`Server.getConnections()`][] method instead.
 
 <a id="DEP0021"></a>
 ### DEP0021: `Server.listenFD`
@@ -2759,7 +2762,6 @@ const moduleParents = Object.values(require.cache)
 [`EventEmitter.listenerCount(emitter, eventName)`]: events.html#events_eventemitter_listenercount_emitter_eventname
 [`REPLServer.clearBufferedCommand()`]: repl.html#repl_replserver_clearbufferedcommand
 [`ReadStream.open()`]: fs.html#fs_class_fs_readstream
-[`Server.connections`]: net.html#net_server_connections
 [`Server.getConnections()`]: net.html#net_server_getconnections_callback
 [`Server.listen({fd: <number>})`]: net.html#net_server_listen_handle_backlog_callback
 [`SlowBuffer`]: buffer.html#buffer_class_slowbuffer

doc/api/net.md

@@ -156,22 +156,6 @@ The optional `callback` will be called once the `'close'` event occurs. Unlike
 that event, it will be called with an `Error` as its only argument if the server
 was not open when it was closed.
 
-### `server.connections`
-<!-- YAML
-added: v0.2.0
-deprecated: v0.9.7
--->
-
-> Stability: 0 - Deprecated: Use [`server.getConnections()`][] instead.
-
-* {integer|null}
-
-The number of concurrent connections on the server.
-
-This becomes `null` when sending a socket to a child with
-[`child_process.fork()`][]. To poll forks and get current number of active
-connections, use asynchronous [`server.getConnections()`][] instead.
-
 ### `server.getConnections(callback)`
 <!-- YAML
 added: v0.9.7
@@ -1256,7 +1240,6 @@ Returns `true` if input is a version 6 IP address, otherwise returns `false`.
 [`new net.Socket(options)`]: #net_new_net_socket_options
 [`readable.setEncoding()`]: stream.html#stream_readable_setencoding_encoding
 [`server.close()`]: #net_server_close_callback
-[`server.getConnections()`]: #net_server_getconnections_callback
 [`server.listen()`]: #net_server_listen
 [`server.listen(handle)`]: #net_server_listen_handle_backlog_callback
 [`server.listen(options)`]: #net_server_listen_options_callback

doc/api/tls.md

@@ -580,18 +580,6 @@ The `server.close()` method stops the server from accepting new connections.
 This function operates asynchronously. The `'close'` event will be emitted
 when the server has no more open connections.
 
-### `server.connections`
-<!-- YAML
-added: v0.3.2
-deprecated: v0.9.7
--->
-
-> Stability: 0 - Deprecated: Use [`server.getConnections()`][] instead.
-
-* {number}
-
-Returns the current number of concurrent connections on the server.
-
 ### `server.getTicketKeys()`
 <!-- YAML
 added: v3.0.0
@@ -1963,7 +1951,6 @@ where `secureSocket` has the same API as `pair.cleartext`.
 [`net.Server`]: net.html#net_class_net_server
 [`net.Socket`]: net.html#net_class_net_socket
 [`server.addContext()`]: #tls_server_addcontext_hostname_context
-[`server.getConnections()`]: net.html#net_server_getconnections_callback
 [`server.getTicketKeys()`]: #tls_server_getticketkeys
 [`server.listen()`]: net.html#net_server_listen
 [`server.setTicketKeys()`]: #tls_server_setticketkeys_keys

lib/net.js

@@ -38,7 +38,6 @@ const { inspect } = require('internal/util/inspect');
 let debug = require('internal/util/debuglog').debuglog('net', (fn) => {
   debug = fn;
 });
-const { deprecate } = require('internal/util');
 const {
   isIP,
   isIPv4,
@@ -1157,21 +1156,6 @@ function Server(options, connectionListener) {
 
   this._connections = 0;
 
-  ObjectDefineProperty(this, 'connections', {
-    get: deprecate(() => {
-
-      if (this._usingWorkers) {
-        return null;
-      }
-      return this._connections;
-    }, 'Server.connections property is deprecated. ' +
-       'Use Server.getConnections method instead.', 'DEP0020'),
-    set: deprecate((val) => (this._connections = val),
-                   'Server.connections property is deprecated.',
-                   'DEP0020'),
-    configurable: true, enumerable: false
-  });
-
   this[async_id_symbol] = -1;
   this._handle = null;
   this._usingWorkers = false;

test/parallel/test-net-server-close.js

@@ -20,40 +20,26 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 'use strict';
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const net = require('net');
 
-const events = [];
 const sockets = [];
 
-process.on('exit', function() {
-  assert.strictEqual(server.connections, 0);
-  assert.strictEqual(events.length, 3);
-  // Expect to see one server event and two client events. The order of the
-  // events is undefined because they arrive on the same event loop tick.
-  assert.strictEqual(events.join(' ').match(/server/g).length, 1);
-  assert.strictEqual(events.join(' ').match(/client/g).length, 2);
-});
-
 const server = net.createServer(function(c) {
-  c.on('close', function() {
-    events.push('client');
-  });
+  c.on('close', common.mustCall());
 
   sockets.push(c);
 
   if (sockets.length === 2) {
     assert.strictEqual(server.close(), server);
-    sockets.forEach(function(c) { c.destroy(); });
+    sockets.forEach((c) => c.destroy());
   }
 });
 
-server.on('close', function() {
-  events.push('server');
-});
+server.on('close', common.mustCall());
 
-assert.strictEqual(server, server.listen(0, function() {
-  net.createConnection(this.address().port);
-  net.createConnection(this.address().port);
+assert.strictEqual(server, server.listen(0, () => {
+  net.createConnection(server.address().port);
+  net.createConnection(server.address().port);
 }));

test/parallel/test-net-server-connections-child-null.js

@@ -21,37 +21,19 @@
 
 'use strict';
 
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const net = require('net');
 
-const s = new net.Stream();
-
-// Test that destroy called on a stream with a server only ever decrements the
-// server connection count once
-
-s.server = new net.Server();
-s.server.connections = 10;
-s._server = s.server;
-
-assert.strictEqual(s.server.connections, 10);
-s.destroy();
-assert.strictEqual(s.server.connections, 9);
-s.destroy();
-assert.strictEqual(s.server.connections, 9);
-
 const SIZE = 2E6;
 const N = 10;
 const buf = Buffer.alloc(SIZE, 'a');
 
 const server = net.createServer(function(socket) {
   socket.setNoDelay();
 
-  socket.on('error', function(err) {
-    socket.destroy();
-  }).on('close', function() {
-    server.close();
-  });
+  socket.on('error', common.mustCall(() => socket.destroy()))
+        .on('close', common.mustCall(() => server.close()));
 
   for (let i = 0; i < N; ++i) {
     socket.write(buf, () => {});
@@ -67,7 +49,3 @@ const server = net.createServer(function(socket) {
     }, 20);
   });
 });
-
-process.on('exit', function() {
-  assert.strictEqual(server.connections, 0);
-});

test/parallel/test-net-server-connections.js

@@ -1,6 +1,6 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const net = require('net');
 
@@ -26,16 +26,8 @@ server.listen(0, function() {
   });
 });
 
-process.on('exit', function() {
-  assert.strictEqual(server.connections, 0);
-});
-
 function handle(socket) {
   socket.resume();
-
-  socket.on('error', function(err) {
-    socket.destroy();
-  }).on('close', function() {
-    server.close();
-  });
+  socket.on('error', common.mustNotCall())
+        .on('close', common.mustCall(() => server.close()));
 }