Extract meta data about open sockets into separate class.

sdk/lib/io/io_resource_info.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of dart.io;
+
+abstract class _IOResourceInfo {
+  String type;

[Søren Gjesse, 2015/09/02 09:07:49]

Can't type and id and be final?

[ricow1, 2015/09/02 10:45:42]

Done.

+  int id;
+  String get name;
+  static int _count = 0;
+
+  _IOResourceInfo(this.type) : id = _IOResourceInfo.getNextID();
+
+  String toJSON();
+
+  /// Get the full set of values for a specific implementation. This is normally
+  /// looked up based on an id from a referenceValueMap.
+  Map<String, String> get fullValueMap;
+
+  /// The reference map, used to return a list of values, e.g., getting
+  /// all open sockets. The structure of this is shared among all subclasses.
+  Map<String, String> get referenceValueMap =>

[Søren Gjesse, 2015/09/02 09:07:49]

Cache this value?

[ricow1, 2015/09/02 10:45:42]

Imagine how few times this will be called compared to the number of sockets
created. This will only be called (on all open sockets), if somebody presses the
sockets link in the observatory. If we cache it we waste an extra field for
every socket object ever created. I don't really have strong feelings on this
though, and can add caching.

[Søren Gjesse, 2015/09/02 12:24:50]

Good point. Lets leave it as is.

+      {
+        'type': '@$type',

[Søren Gjesse, 2015/09/02 09:07:49]

What is the reason for the @?

[ricow1, 2015/09/02 10:45:42]

John told me that the reference objects have that in front, 

[Søren Gjesse, 2015/09/02 12:24:50]

Thought so :-) - maybe add a comment.

[ricow1, 2015/09/02 12:45:50]

Done.

+        'id': id,
+        'name': name,
+      };
+
+  static int getNextID() => _count++;
+}
+
+abstract class _ReadWriteResourceInfo extends _IOResourceInfo {
+  int totalRead;
+  int totalWritten;
+  int readCount;
+  int writeCount;
+  double lastRead;
+  double lastWrite;
+
+  _ReadWriteResourceInfo(String type) :
+    totalRead = 0,
+    totalWritten = 0,
+    readCount = 0,
+    writeCount = 0,
+    lastRead = 0.0,
+    lastWrite = 0.0,
+    super(type);
+
+  Map<String, String> get fullValueMap =>
+    {
+      'type': type,
+      'id': id,
+      'name': name,
+      'total_read': totalRead,
+      'total_written': totalWritten,
+      'read_count': readCount,
+      'write_count': writeCount,
+      'last_read': lastRead,
+      'last_write': lastWrite
+    };
+
+  String toJSON() {
+    return JSON.encode(fullValueMap);
+  }
+}
+
+class _SocketResourceInfo extends _ReadWriteResourceInfo{

[Søren Gjesse, 2015/09/02 09:07:49]

nit: missing space before {.

[ricow1, 2015/09/02 10:45:42]

Done.

+  final _NativeSocket socket;
+
+  static Map<int, _SocketResourceInfo> openSockets =
+      new Map<int, _SocketResourceInfo>();
+
+  _SocketResourceInfo(this.socket) : super('_socket') {
+    SocketOpened(this);
+  }
+
+  String get name {

[Søren Gjesse, 2015/09/02 09:07:49]

Cache the String generated here?

[ricow1, 2015/09/02 10:45:42]

Same answer as above, happy to add caching though if you still want it

[Søren Gjesse, 2015/09/02 12:24:50]

ditto answer.

+    if (socket.isListening) {
+      return 'listening:${socket.address.host}:${socket.port}';
+    }
+    var remote = '';
+    try {
+      var remoteHost = socket.remoteAddress.host;
+      var remotePort = socket.remotePort;
+      remote = ' -> $remoteHost:$remotePort';
+    } catch (e) { } // ignored if we can't get the information
+    return '${socket.address.host}:${socket.port}$remote';
+  }
+
+  static Iterable<Map<String, String>> getOpenSocketsList() {
+    return new List.from(openSockets.values.map((e) => e.referenceValueMap));
+  }
+
+  Map<String, String> getSocketInfoMap() {
+    var result = fullValueMap;
+    result['socket_type'] = socket.isTcp ? 'TCP' : 'UDP';

[Søren Gjesse, 2015/09/02 09:07:49]

Please make constants for these string keys.

[ricow1, 2015/09/02 10:45:42]

Done.

+    result['listening'] = socket.isListening;
+    result['host'] = socket.address.host;
+    result['port'] = socket.port;
+    if (!socket.isListening) {
+      try {
+        result['remote_host'] = socket.remoteAddress.host;
+        result['remote_port'] = socket.remotePort;
+      } catch (e) {
+        // UDP.
+        result['remote_port'] = 'NA';
+        result['remote_host'] = 'NA';
+      }
+    } else {
+      result['remote_port'] = 'NA';
+      result['remote_host'] = 'NA';
+    }
+    result['address_type'] = socket.address.type.name;
+    return result;
+  }
+
+  static Future<ServiceExtensionResponse> getSocketInfoMapByID(
+      String function, Map<String, String> params) {
+    assert(params.containsKey('id'));
+    var id = int.parse(params['id']);
+    var result =
+      openSockets.containsKey(id) ? openSockets[id].getSocketInfoMap() : {};
+    var json = JSON.encode(result);
+    return new Future.value(new ServiceExtensionResponse.result(json));
+  }
+
+  static Future<ServiceExtensionResponse> getOpenSockets(function, params) {
+    assert(function == '__getOpenSockets');
+    var data = {'type': '_opensockets', 'data': getOpenSocketsList()};
+    var json = JSON.encode(data);
+    return new Future.value(new ServiceExtensionResponse.result(json));
+  }
+
+  static Future<ServiceExtensionResponse> getSocketInfo(function, params) {
+    assert(function == '__getSocketInfo');
+    assert(params.containsKey('id'));
+    var result = openSockets.containsKey(params['id']) != null
+        ? openSockets[params['id']].getSocketInfoMap() : {};
+    return
+        Future.value(new ServiceExtensionResponse.result(JSON.encode(result)));
+  }
+
+  static SocketOpened(_SocketResourceInfo info) {
+    assert(!openSockets.containsKey(info.id));
+    openSockets[info.id] = info;
+  }
+
+  static SocketClosed(_SocketResourceInfo info) {
+    assert(openSockets.containsKey(info.id));
+    openSockets.remove(info.id);
+  }
+
+}