Rework error handling in the service protocol and in Observatory.

runtime/vm/json_stream.h

 // 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.
 
 #ifndef VM_JSON_STREAM_H_
 #define VM_JSON_STREAM_H_
 
 #include "include/dart_api.h"  // for Dart_Port
 #include "platform/json.h"
 #include "vm/allocation.h"
 
 namespace dart {
 
 class Array;
 class Field;
 class GrowableObjectArray;
 class Instance;
 class JSONArray;
 class JSONObject;
 class MessageQueue;
 class Metric;
 class Object;
 class ServiceEvent;
 class SourceBreakpoint;
 class String;
 class Zone;
 
+
+enum JSONRpcErrorCode {
+  kParseError     = -32700,
+  kInvalidRequest = -32600,
+  kMethodNotFound = -32601,
+  kInvalidParams  = -32602,
+  kInternalError  = -32603,
+
+  kVMMustBePaused    = 100,
+  kNoBreakAtLine     = 101,
+  kNoBreakAtFunction = 102,
+
+  kProfilingDisabled = 200,
+};
+
+
 class JSONStream : ValueObject {
  public:
   explicit JSONStream(intptr_t buf_size = 256);
   ~JSONStream();
 
   void Setup(Zone* zone,
              Dart_Port reply_port,
              const String& seq,
              const String& method,
              const Array& param_keys,
              const Array& param_values);
   void SetupError();
 
+  void PrintError(intptr_t code, const char* details_format, ...);
+
   void PostReply();
 
   TextBuffer* buffer() { return &buffer_; }
   const char* ToCString() { return buffer_.buf(); }
 
   void set_reply_port(Dart_Port port);
 
   void SetParams(const char** param_keys, const char** param_values,
                  intptr_t num_params);
 
@@ skipping 199 matching lines @@
 
   friend class JSONObject;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(JSONArray);
 };
 
 }  // namespace dart
 
 #endif  // VM_JSON_STREAM_H_