/*-------------------------------------------------------------------------
 * drawElements Quality Program Test Executor
 * ------------------------------------------
 *
 * Copyright 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *//*!
 * \file
 * \brief Tcp/Ip link that manages execserver process.
 *//*--------------------------------------------------------------------*/

#include "xeLocalTcpIpLink.hpp"
#include "deClock.h"
#include "deThread.h"

#include <sstream>

enum
{
	SERVER_START_TIMEOUT	= 1000,
	SERVER_START_IDLE_SLEEP	= 50
};

namespace xe
{

LocalTcpIpLink::LocalTcpIpLink (void)
	: m_process(DE_NULL)
{
}

LocalTcpIpLink::~LocalTcpIpLink (void)
{
	stop();
}

void LocalTcpIpLink::start (const char* execServerPath, const char* workDir, int port)
{
	XE_CHECK(!m_process);

	std::ostringstream cmdLine;
	cmdLine << execServerPath << " --single --port=" << port;

	m_process = deProcess_create();
	XE_CHECK(m_process);

	if (deProcess_start(m_process, cmdLine.str().c_str(), workDir) != DE_TRUE)
	{
		std::string err = deProcess_getLastError(m_process);
		deProcess_destroy(m_process);
		m_process = DE_NULL;

		XE_FAIL((std::string("Failed to start ExecServer '") + execServerPath + "' : " + err).c_str());
	}

	try
	{
		de::SocketAddress address;
		address.setFamily	(DE_SOCKETFAMILY_INET4);
		address.setProtocol	(DE_SOCKETPROTOCOL_TCP);
		address.setHost		("127.0.0.1");
		address.setPort		(port);

		// Wait until server has started - \todo [2012-07-19 pyry] This could be improved by having server to signal when it is ready.
		deUint64 waitStart = deGetMicroseconds();
		for (;;)
		{
			if (!deProcess_isRunning(m_process))
				XE_FAIL("ExecServer died");

			try
			{
				m_link.connect(address);
				break;
			}
			catch (const de::SocketError&)
			{
				if (deGetMicroseconds()-waitStart > SERVER_START_TIMEOUT*1000)
					XE_FAIL("Server start timeout");

				deSleep(SERVER_START_IDLE_SLEEP);
			}
		}

		// Close stdout/stderr or otherwise process will hang once OS pipe buffers are full.
		// \todo [2012-07-19 pyry] Read and store stdout/stderr from execserver.
		XE_CHECK(deProcess_closeStdOut(m_process));
		XE_CHECK(deProcess_closeStdErr(m_process));
	}
	catch (const std::exception&)
	{
		stop();
		throw;
	}
}

void LocalTcpIpLink::stop (void)
{
	if (m_process)
	{
		try
		{
			m_link.disconnect();
		}
		catch (...)
		{
			// Silently ignore since this is called in destructor.
		}

		// \note --single flag is used so execserver should kill itself once one connection is handled.
		//		 This is here to make sure it dies even in case of hang.
		deProcess_terminate		(m_process);
		deProcess_waitForFinish	(m_process);
		deProcess_destroy		(m_process);

		m_process = DE_NULL;
	}
}

void LocalTcpIpLink::reset (void)
{
	m_link.reset();
}

CommLinkState LocalTcpIpLink::getState (void) const
{
	if (!m_process)
		return COMMLINKSTATE_ERROR;
	else
		return m_link.getState();
}

CommLinkState LocalTcpIpLink::getState (std::string& error) const
{
	if (!m_process)
	{
		error = "Not started";
		return COMMLINKSTATE_ERROR;
	}
	else
		return m_link.getState();
}

void LocalTcpIpLink::setCallbacks (StateChangedFunc stateChangedCallback, LogDataFunc testLogDataCallback, LogDataFunc infoLogDataCallback, void* userPtr)
{
	m_link.setCallbacks(stateChangedCallback, testLogDataCallback, infoLogDataCallback, userPtr);
}

void LocalTcpIpLink::startTestProcess (const char* name, const char* params, const char* workingDir, const char* caseList)
{
	if (m_process)
		m_link.startTestProcess(name, params, workingDir, caseList);
	else
		XE_FAIL("Not started");
}

void LocalTcpIpLink::stopTestProcess (void)
{
	if (m_process)
		m_link.stopTestProcess();
	else
		XE_FAIL("Not started");
}

} // xe