json serialization for rpc-relevant monero types

Structured {de-,}serialization methods for (many new) types
which are used for requests or responses in the RPC.

New types include RPC requests and responses, and structs which compose
types within those.

# Conflicts:
#	src/cryptonote_core/blockchain.cpp

src/rpc/message.cpp

@@ -0,0 +1,286 @@
+// Copyright (c) 2016-2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "message.h"
+#include "daemon_rpc_version.h"
+#include "serialization/json_object.h"
+
+#include "rapidjson/writer.h"
+#include "rapidjson/stringbuffer.h"
+
+namespace cryptonote
+{
+
+namespace rpc
+{
+
+const char* Message::STATUS_OK = "OK";
+const char* Message::STATUS_RETRY = "Retry";
+const char* Message::STATUS_FAILED = "Failed";
+const char* Message::STATUS_BAD_REQUEST = "Invalid request type";
+const char* Message::STATUS_BAD_JSON = "Malformed json";
+
+rapidjson::Value Message::toJson(rapidjson::Document& doc) const
+{
+  rapidjson::Value val(rapidjson::kObjectType);
+
+  auto& al = doc.GetAllocator();
+
+  val.AddMember("status", rapidjson::StringRef(status.c_str()), al);
+  val.AddMember("error_details", rapidjson::StringRef(error_details.c_str()), al);
+  INSERT_INTO_JSON_OBJECT(val, doc, rpc_version, DAEMON_RPC_VERSION);
+
+  return val;
+}
+
+void Message::fromJson(rapidjson::Value& val)
+{
+  GET_FROM_JSON_OBJECT(val, status, status);
+  GET_FROM_JSON_OBJECT(val, error_details, error_details);
+  GET_FROM_JSON_OBJECT(val, rpc_version, rpc_version);
+}
+
+
+FullMessage::FullMessage(const std::string& request, Message* message)
+{
+  doc.SetObject();
+
+  doc.AddMember("method", rapidjson::StringRef(request.c_str()), doc.GetAllocator());
+  doc.AddMember("params", message->toJson(doc), doc.GetAllocator());
+
+  // required by JSON-RPC 2.0 spec
+  doc.AddMember("jsonrpc", rapidjson::Value("2.0"), doc.GetAllocator());
+}
+
+FullMessage::FullMessage(Message* message)
+{
+  doc.SetObject();
+
+  // required by JSON-RPC 2.0 spec
+  doc.AddMember("jsonrpc", "2.0", doc.GetAllocator());
+
+  if (message->status == Message::STATUS_OK)
+  {
+    doc.AddMember("response", message->toJson(doc), doc.GetAllocator());
+  }
+  else
+  {
+    cryptonote::rpc::error err;
+
+    err.error_str = message->status;
+    err.message = message->error_details;
+
+    INSERT_INTO_JSON_OBJECT(doc, doc, error, err);
+  }
+}
+
+FullMessage::FullMessage(const std::string& json_string, bool request)
+{
+  doc.Parse(json_string.c_str());
+  if (doc.HasParseError())
+  {
+    throw cryptonote::json::PARSE_FAIL();
+  }
+
+  OBJECT_HAS_MEMBER_OR_THROW(doc, "jsonrpc")
+
+  if (request)
+  {
+    OBJECT_HAS_MEMBER_OR_THROW(doc, "method")
+    OBJECT_HAS_MEMBER_OR_THROW(doc, "params")
+  }
+  else
+  {
+    if (!doc.HasMember("response") && !doc.HasMember("error"))
+    {
+      throw cryptonote::json::MISSING_KEY("error/response");
+    }
+  }
+}
+
+std::string FullMessage::getJson()
+{
+
+  if (!doc.HasMember("id"))
+  {
+    doc.AddMember("id", rapidjson::Value("unused"), doc.GetAllocator());
+  }
+
+  rapidjson::StringBuffer buf;
+
+  rapidjson::Writer<rapidjson::StringBuffer> writer(buf);
+
+  doc.Accept(writer);
+
+  return std::string(buf.GetString(), buf.GetSize());
+}
+
+std::string FullMessage::getRequestType() const
+{
+  OBJECT_HAS_MEMBER_OR_THROW(doc, "method")
+  return doc["method"].GetString();
+}
+
+rapidjson::Value& FullMessage::getMessage()
+{
+  if (doc.HasMember("params"))
+  {
+    return doc["params"];
+  }
+  else if (doc.HasMember("response"))
+  {
+    return doc["response"];
+  }
+
+  //else
+  OBJECT_HAS_MEMBER_OR_THROW(doc, "error")
+  return doc["error"];
+
+}
+
+rapidjson::Value FullMessage::getMessageCopy()
+{
+  rapidjson::Value& val = getMessage();
+
+  return rapidjson::Value(val, doc.GetAllocator());
+}
+
+rapidjson::Value& FullMessage::getID()
+{
+  OBJECT_HAS_MEMBER_OR_THROW(doc, "id")
+  return doc["id"];
+}
+
+void FullMessage::setID(rapidjson::Value& id)
+{
+  auto itr = doc.FindMember("id");
+  if (itr != doc.MemberEnd())
+  {
+    itr->value = id;
+  }
+  else
+  {
+    doc.AddMember("id", id, doc.GetAllocator());
+  }
+}
+
+cryptonote::rpc::error FullMessage::getError()
+{
+  cryptonote::rpc::error err;
+  err.use = false;
+  if (doc.HasMember("error"))
+  {
+    GET_FROM_JSON_OBJECT(doc, err, error);
+    err.use = true;
+  }
+
+  return err;
+}
+
+FullMessage FullMessage::requestMessage(const std::string& request, Message* message)
+{
+  return FullMessage(request, message);
+}
+
+FullMessage FullMessage::requestMessage(const std::string& request, Message* message, rapidjson::Value& id)
+{
+  auto mes = requestMessage(request, message);
+  mes.setID(id);
+  return mes;
+}
+
+FullMessage FullMessage::responseMessage(Message* message)
+{
+  return FullMessage(message);
+}
+
+FullMessage FullMessage::responseMessage(Message* message, rapidjson::Value& id)
+{
+  auto mes = responseMessage(message);
+  mes.setID(id);
+  return mes;
+}
+
+FullMessage* FullMessage::timeoutMessage()
+{
+  auto *full_message = new FullMessage();
+
+  auto& doc = full_message->doc;
+  auto& al = full_message->doc.GetAllocator();
+
+  doc.SetObject();
+
+  // required by JSON-RPC 2.0 spec
+  doc.AddMember("jsonrpc", "2.0", al);
+
+  cryptonote::rpc::error err;
+
+  err.error_str = "RPC request timed out.";
+  INSERT_INTO_JSON_OBJECT(doc, doc, err, err);
+
+  return full_message;
+}
+
+// convenience functions for bad input
+std::string BAD_REQUEST(const std::string& request)
+{
+  Message fail;
+  fail.status = Message::STATUS_BAD_REQUEST;
+  fail.error_details = std::string("\"") + request + "\" is not a valid request.";
+
+  FullMessage fail_response = FullMessage::responseMessage(&fail);
+
+  return fail_response.getJson();
+}
+
+std::string BAD_REQUEST(const std::string& request, rapidjson::Value& id)
+{
+  Message fail;
+  fail.status = Message::STATUS_BAD_REQUEST;
+  fail.error_details = std::string("\"") + request + "\" is not a valid request.";
+
+  FullMessage fail_response = FullMessage::responseMessage(&fail, id);
+
+  return fail_response.getJson();
+}
+
+std::string BAD_JSON(const std::string& error_details)
+{
+  Message fail;
+  fail.status = Message::STATUS_BAD_JSON;
+  fail.error_details = error_details;
+
+  FullMessage fail_response = FullMessage::responseMessage(&fail);
+
+  return fail_response.getJson();
+}
+
+
+}  // namespace rpc
+
+}  // namespace cryptonote