naclmessages.cpp

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/*
 * The ManaPlus Client
 * Copyright (C) 2015-2019 The ManaPlus Developers
 * Copyright (C) 2019-2021 Andrei Karas
 *
 * This file is part of The ManaPlus Client.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifdef __native_client__
 
#include "utils/naclmessages.h"
 
#include <ppapi_simple/ps.h>
#include <ppapi_simple/ps_event.h>
#include <ppapi/cpp/instance.h>
#include <ppapi/cpp/var.h>
 
#include <mutex>
#include <condition_variable>
 
#include "debug.h"
 
struct NaclMessageHandle final
{
 NaclMessageHandle() :
 handled(false),
 type(),
 message(),
 condv()
 { }
 
 A_DELETE_COPY(NaclMessageHandle)
 
 bool handled;
 std::string type;
 std::string message;
 std::condition_variable condv;
};
 
void naclPostMessage(const std::string &type,
 const std::string &message)
{
 pp::Var msgVar = pp::Var(std::string(type).append(":").append(message));
 pp::Instance(PSGetInstanceId()).PostMessage(msgVar);
}
 
static void naclMessageHandlerFunc(struct PP_Var key,
 struct PP_Var value,
 void* user_data)
{
 NaclMessageHandle *handle = reinterpret_cast<NaclMessageHandle *>(
 user_data);
 
 if (key.type != PP_VARTYPE_STRING || value.type != PP_VARTYPE_STRING)
 return;
 if (pp::Var(key).AsString() != handle->type)
 return;
 
 handle->handled = true;
 handle->message = pp::Var(value).AsString();
 
 handle->condv.notify_one();
}
 
NaclMessageHandle *naclRegisterMessageHandler(const std::string &type)
{
 NaclMessageHandle *handle = new NaclMessageHandle;
 handle->handled = false;
 handle->type = type;
 
 PSEventRegisterMessageHandler(type.c_str(),
 naclMessageHandlerFunc,
 reinterpret_cast<void *>(handle));
 return handle;
}
 
void naclUnregisterMessageHandler(NaclMessageHandle *handle)
{
 PSEventRegisterMessageHandler(handle->type.c_str(),
 nullptr,
 nullptr);
 delete handle;
}
 
std::string naclWaitForMessage(NaclMessageHandle *handle)
{
 std::mutex mtx;
 std::unique_lock <std::mutex> lck(mtx);
 
 while (!handle->handled)
 handle->condv.wait(lck);
 
 handle->handled = false;
 return handle->message;
}
 
#endif // __native_client__