dbus_request.hpp

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/*
 *    Copyright (c) 2019, The OpenThread Authors.
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 *    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.
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 *       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"
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 */
 
#ifndef OTBR_LOG_TAG
#define OTBR_LOG_TAG "DBUS"
#endif
 
#include "common/code_utils.hpp"
#include "common/logging.hpp"
 
#include "dbus/common/dbus_message_dump.hpp"
#include "dbus/common/dbus_message_helper.hpp"
#include "dbus/common/dbus_resources.hpp"
#include "dbus/server/error_helper.hpp"
 
namespace otbr {
namespace DBus {
 
class DBusRequest
{
public:
    DBusRequest(DBusConnection *aConnection, DBusMessage *aMessage)
        : mConnection(aConnection)
        , mMessage(aMessage)
    {
        dbus_message_ref(aMessage);
        dbus_connection_ref(aConnection);
    }
 
    DBusRequest(const DBusRequest &aOther)
        : mConnection(nullptr)
        , mMessage(nullptr)
    {
        CopyFrom(aOther);
    }
 
    DBusRequest &operator=(const DBusRequest &aOther)
    {
        CopyFrom(aOther);
        return *this;
    }
 
    DBusMessage *GetMessage(void) { return mMessage; }
 
    DBusConnection *GetConnection(void) { return mConnection; }
 
    template <typename... Args> void Reply(const std::tuple<Args...> &aReply)
    {
        UniqueDBusMessage reply{dbus_message_new_method_return(mMessage)};
 
        VerifyOrExit(reply != nullptr);
        VerifyOrExit(otbr::DBus::TupleToDBusMessage(*reply, aReply) == OTBR_ERROR_NONE);
 
        if (otbrLogGetLevel() >= OTBR_LOG_DEBUG)
        {
            otbrLogDebug("Replied to %s.%s :", dbus_message_get_interface(mMessage), dbus_message_get_member(mMessage));
            DumpDBusMessage(*reply);
        }
        dbus_connection_send(mConnection, reply.get(), nullptr);
 
    exit:
        return;
    }
 
    template <typename ResultType = int>
    void ReplyOtResult(otError aError, Optional<ResultType> aResult = Optional<ResultType>())
    {
        UniqueDBusMessage reply{nullptr};
 
        if (aError == OT_ERROR_NONE)
        {
            otbrLogInfo("Replied to %s.%s with result %s", dbus_message_get_interface(mMessage),
                        dbus_message_get_member(mMessage), ConvertToDBusErrorName(aError));
        }
        else
        {
            otbrLogErr("Replied to %s.%s with result %s", dbus_message_get_interface(mMessage),
                       dbus_message_get_member(mMessage), ConvertToDBusErrorName(aError));
        }
 
        if (aError == OT_ERROR_NONE)
        {
            reply = UniqueDBusMessage(dbus_message_new_method_return(mMessage));
        }
        else
        {
            reply = UniqueDBusMessage(dbus_message_new_error(mMessage, ConvertToDBusErrorName(aError), nullptr));
        }
        VerifyOrDie(reply != nullptr, "Failed to allocate message");
 
        if (aResult.HasValue())
        {
            DBusMessageIter replyIter;
            otbrError       error;
 
            dbus_message_iter_init_append(reply.get(), &replyIter);
            error = DBusMessageEncode(&replyIter, *aResult);
            VerifyOrDie(error == OTBR_ERROR_NONE, "Failed to encode result");
        }
 
        dbus_connection_send(mConnection, reply.get(), nullptr);
    }
 
    ~DBusRequest(void)
    {
        if (mConnection)
        {
            dbus_connection_unref(mConnection);
        }
        if (mMessage)
        {
            dbus_message_unref(mMessage);
        }
    }
 
private:
    void CopyFrom(const DBusRequest &aOther)
    {
        if (mMessage)
        {
            dbus_message_unref(mMessage);
        }
        if (mConnection)
        {
            dbus_connection_unref(mConnection);
        }
        mConnection = aOther.mConnection;
        mMessage    = aOther.mMessage;
        dbus_message_ref(mMessage);
        dbus_connection_ref(mConnection);
    }
 
    DBusConnection *mConnection;
    DBusMessage *   mMessage;
};
 
} // namespace DBus
} // namespace otbr