Update the mDNS command line tools in the mdns package

Add a lookup tool. Add a timeout option to both tools.

[email protected], [email protected]
BUG=

Review URL: https://codereview.chromium.org/1432973002 .

pkg/mdns/bin/mdns-resolve.dart

@@ -0,0 +1,38 @@
+// Copyright (c) 2015, the Fletch 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.md file.
+
+// Example script to illustrate how to use the mdns package to lookup names
+// on the local network.
+
+import 'package:args/args.dart';
+
+import '../lib/mdns.dart';
+
+main(List<String> args) async {
+  // Parse the command line arguments.
+  var parser = new ArgParser();
+  parser.addOption('timeout', abbr: 't', defaultsTo: '5');
+  var arguments = parser.parse(args);
+
+  if (arguments.rest.length != 1) {
+    print('''
+Please provide an address as argument.
+
+For example:
+  dart mdns-resolve.dart [--timeout <timeout>] fletch.local''');
+    return;
+  }
+
+  var name = arguments.rest[0];
+
+  MDnsClient client = new MDnsClient();
+  await client.start();
+  var timeout;
+  timeout = new Duration(seconds: int.parse(arguments['timeout']));
+  await for (ResourceRecord record in
+             client.lookup(RRType.A, name, timeout: timeout)) {
+    print('Found address (${record.address}).');
+  }
+  client.stop();
+}

pkg/mdns/bin/mdns-sd.dart

@@ -5,25 +5,35 @@
 // Example script to illustrate how to use the mdns package to discover services
 // on the local network.
 
-import 'mdns.dart';
+import 'package:args/args.dart';
+
+import '../lib/mdns.dart';
 
 main(List<String> args) async {
-  if (args.length != 1) {
+  // Parse the command line arguments.
+  var parser = new ArgParser();
+  parser.addOption('timeout', abbr: 't', defaultsTo: '5');
+  var arguments = parser.parse(args);
+
+  if (arguments.rest.length != 1) {
     print('''
 Please provide the name of a service as argument.
 
 For example:
-  dart mdns-sd.dart _workstation._tcp.local''');
+  dart mdns-sd.dart  [--timeout <timeout>] _workstation._tcp.local''');
     return;
   }
+
+  var name = arguments.rest[0];
+
   MDnsClient client = new MDnsClient();
   await client.start();
-  await for (ResourceRecord ptr in client.lookup(RRType.PTR, args[0])) {
+  await for (ResourceRecord ptr in client.lookup(RRType.PTR, name)) {
     String domain = ptr.domainName;
     await for (ResourceRecord srv in client.lookup(RRType.SRV, domain)) {
       String target = srv.target;
       await for (ResourceRecord ip in client.lookup(RRType.A, target)) {
-        print('Service instance found at $target ($ip).');
+        print('Service instance found at $target (${ip.address}).');
       }
     }
   }

pkg/mdns/lib/mdns.dart

@@ -59,12 +59,3 @@ abstract class MDnsClient {
       String name,
       {Duration timeout: const Duration(seconds: 5)});
 }
-
-// Simple standalone test.
-Future main(List<String> args) async {
-  var client = new MDnsClient();
-  await client.start();
-  ResourceRecord resource = await client.lookup(RRType.A, args[0]).first;
-  print(address);
-  client.stop();
-}