New class RPC::Status enforces JSON-RPC 2.0 error format.

* Relevant issues:
  * RIPD-92
  * RIPD-97
  * RIPD-98
  * RIPD-439

src/ripple/rpc/impl/Status.cpp

@@ -0,0 +1,77 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <ripple/rpc/Status.h>
+
+namespace ripple {
+namespace RPC {
+namespace New {
+
+std::string Status::codeString () const
+{
+    if (!*this)
+        return "";
+
+    if (type_ == Type::none)
+        return std::to_string (code_);
+
+    if (type_ == Status::Type::TER)
+    {
+        std::string s1, s2;
+
+        auto success = transResultInfo (toTER (), s1, s2);
+        assert (success);
+        (void) success;
+
+        return s1 + ": " + s2;
+    }
+
+    if (type_ == Status::Type::error_code_i)
+    {
+        auto info = get_error_info (toErrorCode ());
+        return info.token +  ": " + info.message;
+    }
+
+    assert (false);
+    return "";
+}
+
+void Status::fillJson (Json::Value& value)
+{
+    static const std::string separator = ": ";
+
+    if (!*this)
+        return;
+
+    auto& error = value[jss::error];
+    error[jss::code] = code_;
+    error[jss::message] = codeString ();
+
+    // Are there any more messages?
+    if (!messages_.empty ())
+    {
+        auto& messages = error[jss::data];
+        for (auto& i: messages_)
+            messages.append (i);
+    }
+}
+
+} // namespace New
+} // namespace RPC
+} // ripple