Provide an API to dart:developer to control the web server hosting the Service Protocol

runtime/bin/vmservice/vmservice_io.dart

 // Copyright (c) 2013, 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.
 
 library vmservice_io;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io';
@@ skipping 144 matching lines @@
       var map = {};
       map['name'] = '/' + filePath.substring(dirPathStr.length);
       map['size'] = stat.size;
       map['modified'] = stat.modified.millisecondsSinceEpoch;
       result.add(map);
     }
   }
   return result;
 }
 
+Future<Uri> serverInformationCallback() async {
+  _lazyServerBoot();
+  return server.serverAddress;
+}
+
+Future<Uri> webServerControlCallback(bool enable) async {
+  _lazyServerBoot();
+  if (server.running == enable) {
+    // No change.
+    return server.serverAddress;
+  }
+
+  if (enable) {
+    await server.startup();
+    return server.serverAddress;
+  } else {
+    await server.shutdown(true);
+    return server.serverAddress;
+  }
+}
+
 _clearFuture(_) {
   serverFuture = null;
 }
 
 _onSignal(ProcessSignal signal) {
   if (serverFuture != null) {
     // Still waiting.
     return;
   }
   _lazyServerBoot();
@@ skipping 22 matching lines @@
 
 main() {
   // Set embedder hooks.
   VMServiceEmbedderHooks.cleanup = cleanupCallback;
   VMServiceEmbedderHooks.createTempDir = createTempDirCallback;
   VMServiceEmbedderHooks.deleteDir = deleteDirCallback;
   VMServiceEmbedderHooks.writeFile = writeFileCallback;
   VMServiceEmbedderHooks.writeStreamFile = writeStreamFileCallback;
   VMServiceEmbedderHooks.readFile = readFileCallback;
   VMServiceEmbedderHooks.listFiles = listFilesCallback;
+  VMServiceEmbedderHooks.serverInformation = serverInformationCallback;
+  VMServiceEmbedderHooks.webServerControl = webServerControlCallback;
   // Always instantiate the vmservice object so that the exit message
   // can be delivered and waiting loaders can be cancelled.
   var service = new VMService();
   if (_autoStart) {
     _lazyServerBoot();
     server.startup();
     // It's just here to push an event on the event loop so that we invoke the
     // scheduled microtasks.
     Timer.run(() {});
   }
   scriptLoadPort.handler = _processLoadRequest;
   // Register signal handler after a small delay to avoid stalling main
   // isolate startup.
   _registerSignalHandlerTimer = new Timer(shortDelay, _registerSignalHandler);
   return scriptLoadPort;
 }
 
 _shutdown() native "VMServiceIO_Shutdown";