update error handling to send response with stack trace

pkg/analysis_server/lib/src/generated_protocol.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.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script
 // "pkg/analysis_server/tool/spec/generate_files".
 
 part of protocol;
 /**
@@ skipping 8064 matching lines @@
     return _JenkinsSmiHash.finish(hash);
   }
 }
 
 /**
  * RequestError
  *
  * {
  *   "code": RequestErrorCode
  *   "message": String
- *   "data": optional object
+ *   "stackTrace": optional String
  * }
  */
 class RequestError implements HasToJson {
   /**
    * A code that uniquely identifies the error that occurred.
    */
   RequestErrorCode code;
 
   /**
    * A short description of the error.
    */
   String message;
 
   /**
-   * Additional data related to the error. This field is omitted if there is no
-   * additional data available.
+   * The stack trace associated with processing the request, used for debugging
+   * the server.
    */
-  Map data;
+  String stackTrace;
 
-  RequestError(this.code, this.message, {this.data});
+  RequestError(this.code, this.message, {this.stackTrace});
 
   factory RequestError.fromJson(JsonDecoder jsonDecoder, String jsonPath, Object json) {
     if (json == null) {
       json = {};
     }
     if (json is Map) {
       RequestErrorCode code;
       if (json.containsKey("code")) {
         code = new RequestErrorCode.fromJson(jsonDecoder, jsonPath + ".code", json["code"]);
       } else {
         throw jsonDecoder.missingKey(jsonPath, "code");
       }
       String message;
       if (json.containsKey("message")) {
         message = jsonDecoder._decodeString(jsonPath + ".message", json["message"]);
       } else {
         throw jsonDecoder.missingKey(jsonPath, "message");
       }
-      Map data;
-      if (json.containsKey("data")) {
-        data = json["data"];
+      String stackTrace;
+      if (json.containsKey("stackTrace")) {
+        stackTrace = jsonDecoder._decodeString(jsonPath + ".stackTrace", json["stackTrace"]);
       }
-      return new RequestError(code, message, data: data);
+      return new RequestError(code, message, stackTrace: stackTrace);
     } else {
       throw jsonDecoder.mismatch(jsonPath, "RequestError");
     }
   }
 
   Map<String, dynamic> toJson() {
     Map<String, dynamic> result = {};
     result["code"] = code.toJson();
     result["message"] = message;
-    if (data != null) {
-      result["data"] = data;
+    if (stackTrace != null) {
+      result["stackTrace"] = stackTrace;
     }
     return result;
   }
 
   @override
   String toString() => JSON.encode(toJson());
 
   @override
   bool operator==(other) {
     if (other is RequestError) {
       return code == other.code &&
           message == other.message &&
-          data == other.data;
+          stackTrace == other.stackTrace;
     }
     return false;
   }
 
   @override
   int get hashCode {
     int hash = 0;
     hash = _JenkinsSmiHash.combine(hash, code.hashCode);
     hash = _JenkinsSmiHash.combine(hash, message.hashCode);
-    hash = _JenkinsSmiHash.combine(hash, data.hashCode);
+    hash = _JenkinsSmiHash.combine(hash, stackTrace.hashCode);
     return _JenkinsSmiHash.finish(hash);
   }
 }
 
 /**
  * RequestErrorCode
  *
  * enum {
  *   GET_ERRORS_INVALID_FILE
  *   INVALID_OVERLAY_CHANGE
@@ skipping 1842 matching lines @@
     return false;
   }
 
   @override
   int get hashCode {
     int hash = 0;
     hash = _JenkinsSmiHash.combine(hash, newName.hashCode);
     return _JenkinsSmiHash.finish(hash);
   }
 }