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/*
* Copyright (C) 2011 Intel Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "dbus-transport-agent.h"
#include "session-helper.h"
SE_BEGIN_CXX
DBusTransportAgent::DBusTransportAgent(SessionHelper &helper) :
m_helper(helper),
m_state(SessionCommon::SETUP)
{
}
void DBusTransportAgent::serverAlerted()
{
SE_LOG_DEBUG(NULL, NULL, "D-Bus transport: server alerted (old state: %s, %s)",
SessionCommon::ConnectionStateToString(m_state).c_str(),
m_error.c_str());
if (m_state == SessionCommon::SETUP) {
m_state = SessionCommon::PROCESSING;
} else {
SE_THROW_EXCEPTION(TransportException,
"setting 'server alerted' only allowed during setup");
}
}
void DBusTransportAgent::storeMessage(const GDBusCXX::DBusArray<uint8_t> &buffer,
const std::string &type)
{
SE_LOG_DEBUG(NULL, NULL, "D-Bus transport: store incoming message, %ld bytes, %s (old state: %s, %s)",
(long)buffer.first,
type.c_str(),
SessionCommon::ConnectionStateToString(m_state).c_str(),
m_error.c_str());
if (m_state == SessionCommon::SETUP ||
m_state == SessionCommon::WAITING) {
m_incomingMsg = SharedBuffer(reinterpret_cast<const char *>(buffer.second), buffer.first);
m_incomingMsgType = type;
m_state = SessionCommon::PROCESSING;
} else if (m_state == SessionCommon::PROCESSING &&
m_incomingMsgType == type &&
m_incomingMsg.size() == buffer.first &&
!memcmp(m_incomingMsg.get(), buffer.second, buffer.first)) {
// Exactly the same message, accept resend without error, and
// without doing anything.
} else {
SE_THROW_EXCEPTION(TransportException,
"unexpected message");
}
}
void DBusTransportAgent::storeState(const std::string &error)
{
SE_LOG_DEBUG(NULL, NULL, "D-Bus transport: got error '%s', current error is '%s', state %s",
error.c_str(), m_error.c_str(), SessionCommon::ConnectionStateToString(m_state).c_str());
if (!error.empty()) {
// specific error encountered
m_state = SessionCommon::FAILED;
if (m_error.empty()) {
m_error = error;
}
} else if (m_state == SessionCommon::FINAL) {
// expected loss of connection
m_state = SessionCommon::DONE;
} else {
// unexpected loss of connection
m_state = SessionCommon::FAILED;
}
}
void DBusTransportAgent::send(const char *data, size_t len)
{
SE_LOG_DEBUG(NULL, NULL, "D-Bus transport: outgoing message %ld bytes, %s, %s",
(long)len, m_type.c_str(), m_url.c_str());
if (m_state != SessionCommon::PROCESSING) {
SE_THROW_EXCEPTION(TransportException,
"cannot send to our D-Bus peer");
}
m_state = SessionCommon::WAITING;
m_incomingMsg = SharedBuffer();
m_helper.emitMessage(GDBusCXX::DBusArray<uint8_t>(len, reinterpret_cast<const uint8_t *>(data)),
m_type,
m_url);
}
void DBusTransportAgent::shutdown()
{
SE_LOG_DEBUG(NULL, NULL, "D-Bus transport: shut down (old state: %s, %s)",
SessionCommon::ConnectionStateToString(m_state).c_str(),
m_error.c_str());
if (m_state == SessionCommon::PROCESSING) {
m_state = SessionCommon::FINAL;
m_helper.emitShutdown();
}
}
void DBusTransportAgent::doWait()
{
SE_LOG_DEBUG(NULL, NULL, "D-Bus transport: wait - old state: %s, %s",
SessionCommon::ConnectionStateToString(m_state).c_str(),
m_error.c_str());
if (SuspendFlags::getSuspendFlags().getState() == SuspendFlags::NORMAL) {
// Block for one iteration. Both D-Bus calls and signals (thanks
// to the SuspendFlags guard in the running sync session) will
// wake us up.
g_main_context_iteration(NULL, true);
}
SE_LOG_DEBUG(NULL, NULL, "D-Bus transport: wait - new state: %s, %s",
SessionCommon::ConnectionStateToString(m_state).c_str(),
m_error.c_str());
}
DBusTransportAgent::Status DBusTransportAgent::wait(bool noReply)
{
switch (m_state) {
case SessionCommon::PROCESSING:
return GOT_REPLY;
break;
case SessionCommon::FINAL:
doWait();
// if the connection is still available, then keep waiting
if (m_state == SessionCommon::FINAL) {
return ACTIVE;
} else if (m_error.empty()) {
return INACTIVE;
} else {
SE_THROW_EXCEPTION(TransportException, m_error);
return FAILED;
}
break;
case SessionCommon::WAITING:
if (noReply) {
// message is sent as far as we know, so return
return INACTIVE;
}
doWait();
// tell caller to check again
return ACTIVE;
break;
case SessionCommon::DONE:
if (!noReply) {
SE_THROW_EXCEPTION(TransportException,
"internal error: transport has shut down, can no longer receive reply");
}
return CLOSED;
default:
SE_THROW_EXCEPTION(TransportException,
"send() on connection which is not ready");
break;
}
return FAILED;
}
void DBusTransportAgent::getReply(const char *&data, size_t &len, std::string &contentType)
{
data = m_incomingMsg.get();
len = m_incomingMsg.size();
contentType = m_incomingMsgType;
}
SE_END_CXX
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