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// Copyright (c) 2014, 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.
#ifndef JSONRPC_PROTOCOL_HANDLER_H
#define JSONRPC_PROTOCOL_HANDLER_H
#include <cstdint>
#include <string>
#include "net/net_utils_base.h"
#include "jsonrpc_structs.h"
#include "storages/portable_storage.h"
#include "storages/portable_storage_template_helper.h"
namespace epee
{
namespace net_utils
{
namespace jsonrpc2
{
inline
std::string& make_error_resp_json(int64_t code, const std::string& message,
std::string& response_data,
const epee::serialization::storage_entry& id = nullptr)
{
epee::json_rpc::error_response rsp;
rsp.id = id;
rsp.jsonrpc = "2.0";
rsp.error.code = code;
rsp.error.message = message;
epee::serialization::store_t_to_json(static_cast<epee::json_rpc::error_response&>(rsp), response_data, 0, false);
response_data += "\n";
return response_data;
}
template<class t_connection_context>
struct i_jsonrpc2_server_handler
{
virtual ~i_jsonrpc2_server_handler()
{}
virtual bool handle_rpc_request(const std::string& req_data,
std::string& resp_data,
t_connection_context& conn_context) = 0;
virtual bool init_server_thread()
{ return true; }
virtual bool deinit_server_thread()
{ return true; }
};
template<class t_connection_context>
struct jsonrpc2_server_config
{
i_jsonrpc2_server_handler<t_connection_context>* m_phandler;
critical_section m_lock;
};
template<class t_connection_context = net_utils::connection_context_base>
class jsonrpc2_connection_handler
{
public:
typedef t_connection_context connection_context;
typedef jsonrpc2_server_config<t_connection_context> config_type;
jsonrpc2_connection_handler(i_service_endpoint* psnd_hndlr,
config_type& config,
t_connection_context& conn_context)
: m_psnd_hndlr(psnd_hndlr),
m_config(config),
m_conn_context(conn_context),
m_is_stop_handling(false)
{}
virtual ~jsonrpc2_connection_handler()
{}
bool release_protocol()
{
return true;
}
virtual bool thread_init()
{
return true;
}
virtual bool thread_deinit()
{
return true;
}
void handle_qued_callback()
{}
bool after_init_connection()
{
return true;
}
virtual bool handle_recv(const void* ptr, size_t cb)
{
std::string buf((const char*)ptr, cb);
LOG_PRINT_L0("JSONRPC2_RECV: " << ptr << "\r\n" << buf);
bool res = handle_buff_in(buf);
return res;
}
private:
bool handle_buff_in(std::string& buf)
{
if(m_cache.size())
m_cache += buf;
else
m_cache.swap(buf);
m_is_stop_handling = false;
while (!m_is_stop_handling) {
std::string::size_type pos = match_end_of_request(m_cache);
if (std::string::npos == pos) {
m_is_stop_handling = true;
if (m_cache.size() > 4096) {
LOG_ERROR("jsonrpc2_connection_handler::handle_buff_in: Too long request");
return false;
}
break;
} else {
extract_cached_request_and_handle(pos);
}
if (!m_cache.size()) {
m_is_stop_handling = true;
}
}
return true;
}
bool extract_cached_request_and_handle(std::string::size_type pos)
{
std::string request_data(m_cache.begin(), m_cache.begin() + pos);
m_cache.erase(0, pos);
return handle_request_and_send_response(request_data);
}
bool handle_request_and_send_response(const std::string& request_data)
{
CHECK_AND_ASSERT_MES(m_config.m_phandler, false, "m_config.m_phandler is NULL!!!!");
std::string response_data;
LOG_PRINT_L3("JSONRPC2_REQUEST: >> \r\n" << request_data);
bool rpc_result = m_config.m_phandler->handle_rpc_request(request_data, response_data, m_conn_context);
LOG_PRINT_L3("JSONRPC2_RESPONSE: << \r\n" << response_data);
m_psnd_hndlr->do_send((void*)response_data.data(), response_data.size());
return rpc_result;
}
std::string::size_type match_end_of_request(const std::string& buf)
{
std::string::size_type res = buf.find("\n");
if(std::string::npos != res) {
return res + 2;
}
return res;
}
protected:
i_service_endpoint* m_psnd_hndlr;
private:
config_type& m_config;
t_connection_context& m_conn_context;
std::string m_cache;
bool m_is_stop_handling;
};
}
}
}
#endif /* JSONRPC_PROTOCOL_HANDLER_H */
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