first cut fuzz test for analysis server

pkg/analysis_server/bin/fuzz/logging_client_channel.dart

+// Copyright (c) 2014, 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 server.manager;
+
+/**
+ * A client channel that logs communication to stdout
+ * and handles errors received from the server.
+ */
+class LoggingClientChannel implements ClientCommunicationChannel {
+  final ClientCommunicationChannel channel;
+  int serverErrorCount = 0;
+
+  LoggingClientChannel(this.channel) {
+    channel.notificationStream.listen((Notification notification) {
+      _logNotification(notification);
+      if (notification.event == 'server.error') {
+        ServerErrorParams error =
+            new ServerErrorParams.fromNotification(notification);
+        _handleError(
+            'Server reported error: ${error.message}',
+            error.stackTrace);
+      }
+    });
+  }
+
+  @override
+  Stream<Notification> get notificationStream => channel.notificationStream;
+
+  @override
+  void set notificationStream(Stream<Notification> _notificationStream) {
+    throw 'invalid operation';
+  }
+
+  @override
+  Stream<Response> get responseStream => channel.responseStream;
+
+  @override
+  void set responseStream(Stream<Response> _responseStream) {
+    throw 'invalid operation';
+  }
+
+  @override
+  Future close() {
+    print('Requesting client channel be closed');
+    return channel.close().then((_) {
+      print('Client channel closed');
+    });
+  }
+
+  @override
+  Future<Response> sendRequest(Request request) {
+    _logOperation('=>', request);
+    return channel.sendRequest(request).then((Response response) {
+      RequestError error = response.error;
+      if (error != null) {
+        error.code;
+        stderr.write('Server Error ${error.code}: ${error.message}');
+        print(error.stackTrace);
+        exitCode = 31;
+      }
+      _logOperation('<=', request);
+      return response;
+    });
+  }
+
+  void _handleError(String errMsg, String stackTrace) {
+    //error.isFatal;
+    stderr.writeln('>>> Server reported exception');
+    stderr.writeln(errMsg);
+    print(stackTrace);
+    serverErrorCount++;
+  }
+
+  void _logNotification(Notification notification) {
+    print('<=       ${notification.event}');
+  }
+
+  void _logOperation(String direction, Request request) {
+    String id = request.id.padLeft(5);
+    String method = request.method.padRight(20);
+    print('$direction $id $method');
+  }
+}