libgfaservices/rest/main.cpp

#include "main.h"
#include "projal.h"
#include "helpers.h"
#include "callback.h"
#include "instance.h"

#if _REST_USE_SSL
#include "keys.c"
#endif	//	_REST_USE_SSL

#if _REST_LINEAR_GET
#define GetShmPostResponseCallback	GetShmPostResponseCallback_M
#else	//	_REST_LINEAR_GET
#define GetShmPostResponseCallback	GetShmPostResponseCallback_O
#endif	//	_REST_LINEAR_GET

////////////////////////////////////////////////////////////////////////////////////////////////////
// app control

#define _APPID						GFA_APPCTRL_APPID_REST
#define _APPNAME					"REST"
#define _DEPENDENCIES				((appid_t)(GFA_APPCTRL_APPID_REMANENT))
#define _REST_CYCLE_INTV_MS			200

/////////////////////////////////////////////////////////////////////////////

static volatile bool				g_fRun			= false;
static volatile bool				g_fPauseImp		= false;
static volatile bool				g_fPauseCmd		= false;
static volatile bool				g_fZombie		= false;
static appid_t						g_nDepRunning	= 0;
static sigset_t						g_set;
int									g_nLastSig = -1;

/////////////////////////////////////////////////////////////////////////////

static void _SigHandler(int sig)
{
	g_nLastSig = sig;
	g_fRun = g_fPauseImp = g_fPauseCmd = g_fZombie = false;
}

/////////////////////////////////////////////////////////////////////////////

static void _ProcessCtrlMessages(HAPPCTRL hAC, HAPPINFO hAI)
{
    ctrlmsg_t nCtrlMsg;

	while(g_fRun && (nCtrlMsg = ::GfaIpcAppCtrlGetNextCtrlMsg(hAI)))
	{
		switch(nCtrlMsg)
		{
		case GFA_APPCTRL_CTRLMSG_STOP:
			g_fRun = false;
			g_fPauseImp = false;
			g_fPauseCmd = false;
			g_fZombie = false;
			TRACE("Received Control Message 'Stop'\n");
			return;
		case GFA_APPCTRL_CTRLMSG_PAUSE:
			if(!g_fPauseCmd)
			{
				g_fPauseCmd = true;
				if(!g_fPauseImp)
				{
					::GfaIpcAppCtrlSetState(hAC, GIAS_Paused);
					TRACE("Received Control Message 'Pause'\n");
					TRACE("%-8s: State: %s\n", "Me", ::GfaIpcAppCtrlGetStateText(GIAS_Paused));
				}
			}
			break;
		case GFA_APPCTRL_CTRLMSG_RESUME:
			if(g_fPauseCmd)
			{
				g_fPauseCmd = false;
				if(!g_fPauseImp)
				{
					TRACE("Received Control Message 'Resume'\n");
					::GfaIpcAppCtrlSetState(hAC, GIAS_Running);
					TRACE("%-8s: State: %s\n", "Me", ::GfaIpcAppCtrlGetStateText(GIAS_Running));
				}
			}
			break;
		default:
			break;
		}
	}
}

/////////////////////////////////////////////////////////////////////////////

static void _ProcessStateEvents(HAPPCTRL hAC, HAPPINFO hAI)
{
    appid_t nAppIdSrc;
    bool fOldPaused = g_fPauseImp;
	char szDispName[128];

	while(g_fRun && (nAppIdSrc = ::GfaIpcAppCtrlGetNextStateEvtSrc(hAI)))
	{
		GfaIpcAppStates state = ::GfaIpcAppCtrlGetState(hAC, nAppIdSrc);
		GfaIpcAppCtrlGetDisplayName(hAC, nAppIdSrc, szDispName, sizeof(szDispName));
		TRACE("%-8s: State: %s\n", szDispName, ::GfaIpcAppCtrlGetStateText(state));
		
		if(nAppIdSrc & _DEPENDENCIES)
		{
			if(state == GIAS_Running)
			{
				TRACE("%s -> %s.\n", szDispName, ::GfaIpcAppCtrlGetStateText(state));
				g_nDepRunning |= nAppIdSrc;
			}
			else
			{
				TRACE("%s -> %s.\n", szDispName, ::GfaIpcAppCtrlGetStateText(state));
				g_nDepRunning &= ~nAppIdSrc;
			}
		}
	}

	if(g_fRun)
	{
		g_fPauseImp = (g_nDepRunning != _DEPENDENCIES);

		if(!g_fPauseCmd && (fOldPaused != g_fPauseImp))
		{
			fOldPaused = g_fPauseImp;
			GfaIpcAppStates newState = g_fPauseImp ? GIAS_Paused : GIAS_Running;
			::GfaIpcAppCtrlSetState(hAC, newState);
			if(g_fPauseImp)
			{
				TRACE("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(newState));
			}
			else
			{
				TRACE("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(newState));
			}
		}
	}
}

/////////////////////////////////////////////////////////////////////////////
// main

int main(int argc, char *argv[])
{
	UNUSED(argc);
	UNUSED(argv);

	int nRet = 0;
	HSHM hShm = NULL;
	void *pShm = NULL;
	HAPPCTRL hAC = NULL;
	HAPPINFO hAI;
	struct _u_instance instance;
	CURLcode cuGlobInit = CURL_LAST;
	int ulfInit = U_ERROR, ulfStart = U_ERROR;
	bool bUlfFrmwrkStarted = false;

    /////////////////////////////////////////////////////////////////////////
    // check for multiple instances

    CProcessInstance pi;

    if(!pi.LockInstance(UUID_SHM))
    {
        ETRACE("Failed to start instance!\n");
        return -1;
    }

	/////////////////////////////////////////////////////////////////////////

	do
	{
		char szRootDir[PATH_MAX];
		const char *pszRootDir;
		json_error_t jerr;

		g_fZombie = true;

		/////////////////////////////////////////////////////////////
		// configure signal handling

		struct sigaction sa;
		memset(&sa, 0, sizeof(sa));
		sigfillset(&g_set);

		// handle signals
		sa.sa_handler = _SigHandler;
	    sigaction(SIGHUP, &sa, NULL);	// handles user's terminal disconnect
	    sigaction(SIGQUIT, &sa, NULL);	// handles Ctrl + '\'
		sigaction(SIGTERM, &sa, NULL);	// handles normal termination
		sigaction(SIGABRT, &sa, NULL);	// handles abnormal termination (i.e. abort())
		sigaction(SIGINT, &sa, NULL);	// handles Ctrl + 'C'

		// ignore signals
		sa.sa_handler = SIG_IGN;
	    sigaction(SIGTSTP, &sa, NULL);	// ignores Ctrl + 'Z'
	    sigaction(SIGSTOP, &sa, NULL);	// ignores Stop
	    sigaction(SIGCONT, &sa, NULL);	// ignores Continue
	    sigaction(SIGCHLD, &sa, NULL);	// ignores child process termination
	    sigaction(0, &sa, NULL);		// ignores shell termination

		/////////////////////////////////////////////////////////////
		// initialize app control

		if(!(hAC = ::GfaIpcAppCtrlAcquire(_APPID, _APPNAME, _REST_CYCLE_INTV_MS * 1000, _REST_CYCLE_INTV_MS * 3000)))
		{
			ETRACE("Failed to acquire AppCtrl-Handle!\n");
			nRet = -1;
			break;
		}

		::GfaIpcAppCtrlSetState(hAC, GIAS_Initializing);
		TRACE("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(GIAS_Initializing));

		if(!::GfaIpcAppCtrlSubscribeStateEvents(hAC, _DEPENDENCIES))
		{
			ETRACE("Failed to subscribe state event notifications!\n");
			nRet = -1;
			break;
		}

		/////////////////////////////////////////////////////////////////////

		pszRootDir = GetAppDirectory(szRootDir, _COUNTOF(szRootDir));

		/////////////////////////////////////////////////////////////////////
		// initialize CURL

		if((cuGlobInit = curl_global_init(CURL_GLOBAL_ALL)) != CURLE_OK)
		{
			ETRACE("Failed to initialize CURL!\n");
			nRet = -1;
			break;
		}

	    if(!(hShm = acquire_shm(sizeof(shm_t))))
	    {
			ETRACE("GfaIpcAcquireSHM failed!\n");
			nRet = -1;
			break;
	    }

	    if(!(pShm = GfaIpcAcquirePointer(hShm)))
	    {
			ETRACE("GfaIpcAcquirePointer failed!\n");
			nRet = -1;
			break;
	    }
	    
#ifdef _DEBUG
		GfaIpcDumpSHMROT();
		fflush(stdout);
#endif	//	_DEBUG

		/////////////////////////////////////////////////////////////////////

		if((ulfInit = ulfius_init_instance(&instance, _REST_PORT, NULL, NULL)) != U_OK)
		{
			ETRACE("ulfius_init_instance failed!\n");
			nRet = -1;
			break;
		}
			
		/////////////////////////////////////////////////////////////////////
		// SHM and SHM variables table

		CRestVarTable map;
		CShm_t shm(pShm, hShm);
		shm.InitPath(NULL, NULL);
		shm.CreateMembersTable(map);

		/////////////////////////////////////////////////////////////////////
		// initialize request parameters

		SHM_REQUEST_PARAMS srp;
		srp.pMap	= ↦
		srp.pszUuid	= UUID_SHM;

		/////////////////////////////////////////////////////////////////////
		/////////////////////////////////////////////////////////////////////
		// add handler functions
		// initialize static files if any
		if(InitializeStaticFiles(pszRootDir, &instance, jerr) < 0)
		{
			ETRACE("InitializeStaticFiles failed!\n");
			nRet = -1;
			break;
		}

		/////////////////////////////////////////////////////////////////////
		// POST
		if(ulfius_add_endpoint_by_val(&instance, "POST", GET_SHM_PREFIX, NULL, 0, &GetShmPostResponseCallback, &srp) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}
		if(ulfius_add_endpoint_by_val(&instance, "POST", SET_SHM_PREFIX, NULL, 0, &SetShmPostResponseCallback, &srp) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}

#if _REST_IMPLEMENT_GET
		/////////////////////////////////////////////////////////////////////
		// GET
		if(ulfius_add_endpoint_by_val(&instance, "GET", GET_SHM_PREFIX, "/*", 0, &GetShmGetResponseCallback, &srp) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}
#endif	//	_REST_IMPLEMENT_GET

		/////////////////////////////////////////////////////////////////////
		// OPTIONS
		if(ulfius_add_endpoint_by_val(&instance, "OPTIONS", NULL, "/*", 0, &OptionsResponseCallback, NULL) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}

		/////////////////////////////////////////////////////////////////////
		// handler for HTTP verbs that are not allowed
		if(ulfius_add_endpoint_by_val(&instance, "HEAD", NULL, "/*", 0, &NotAllowedResponseCallback, NULL) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}
		if(ulfius_add_endpoint_by_val(&instance, "PUT", NULL, "/*", 0, &NotAllowedResponseCallback, NULL) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}
		if(ulfius_add_endpoint_by_val(&instance, "DELETE", NULL, "/*", 0, &NotAllowedResponseCallback, NULL) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}
		if(ulfius_add_endpoint_by_val(&instance, "CONNECT", NULL, "/*", 0, &NotAllowedResponseCallback, NULL) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}
		if(ulfius_add_endpoint_by_val(&instance, "TRACE", NULL, "/*", 0, &NotAllowedResponseCallback, NULL) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}
		if(ulfius_add_endpoint_by_val(&instance, "PATCH", NULL, "/*", 0, &NotAllowedResponseCallback, NULL) != U_OK)
		{
			ETRACE("ulfius_add_endpoint_by_val failed!\n");
			nRet = -1;
			break;
		}

		/////////////////////////////////////////////////////////////////////
		// start service

#if _REST_USE_SSL
	    if((ulfStart = ulfius_start_secure_framework(&instance, g_pszKeyPem, g_pszCertPem)) != U_OK)
#else	// _REST_USE_SSL
		if((ulfStart = ulfius_start_framework(&instance)) != U_OK)
#endif	// _REST_USE_SSL
		{
			ETRACE("ulfius_start_framework failed!\n");
			nRet = -1;
			break;
		}

		TRACE("Service started at port %hu.\n", instance.port);

		bUlfFrmwrkStarted = true;
		g_fZombie = false;
		g_fRun = true;
		::GfaIpcAppCtrlSetState(hAC, GIAS_Running);
	}
	while(false);

	/////////////////////////////////////////////////////////////////////////
	/////////////////////////////////////////////////////////////////////////
	/////////////////////////////////////////////////////////////////////////

	while(g_fRun)
	{
		////////////////////////////////////////////////////////////////////////////////////////
		// update app control info

		if((hAI = ::GfaIpcAppCtrlInfoUpdate(hAC, 0)))
		{
			_ProcessCtrlMessages(hAC, hAI);
			if(!g_fRun)
				break;
			_ProcessStateEvents(hAC, hAI);
		}
		
		if(bUlfFrmwrkStarted && (g_fPauseImp || g_fPauseCmd))
		{
			ulfius_stop_framework(&instance);
			bUlfFrmwrkStarted = false;
			TRACE("Service exit.\n");
		}
		else if(!bUlfFrmwrkStarted && !g_fPauseImp && !g_fPauseCmd)
		{
#if _REST_USE_SSL
		    if((ulfStart = ulfius_start_secure_framework(&instance, g_pszKeyPem, g_pszCertPem)) != U_OK)
#else	// _REST_USE_SSL
			if((ulfStart = ulfius_start_framework(&instance)) != U_OK)
#endif	// _REST_USE_SSL
			{
				ETRACE("ulfius_start_framework failed!\n");
				g_fZombie = true;
				g_fRun = false;
				nRet = -1;
				break;
			}

			bUlfFrmwrkStarted = true;
			TRACE("Service started at port %hu.\n", instance.port);
		}

		usleep(_REST_CYCLE_INTV_MS * 1000);
	}

	/////////////////////////////////////////////////////////////////////////
	/////////////////////////////////////////////////////////////////////////
	/////////////////////////////////////////////////////////////////////////

	if(g_nLastSig >= 0)
	{
		TRACE("Received signal '%s'.\n", strsignal(g_nLastSig));
		g_nLastSig = -1;
	}

	if(bUlfFrmwrkStarted)
	{
		ulfius_stop_framework(&instance);
		TRACE("Service exit.\n");
	}

	if(ulfInit == U_OK)
		ulfius_clean_instance(&instance);

	if(hShm)
	{
		if(pShm)
		{
			TRACE("Releasing SHM Pointer ...\n");
			::GfaIpcReleasePointer(hShm, pShm);
		}

		TRACE("Releasing SHM Handle ...\n");
    	::GfaIpcReleaseSHM(hShm);
    }

	if(cuGlobInit == CURLE_OK)
	   	curl_global_cleanup();
	
	if(g_fZombie)
	{
		if(hAC)
			::GfaIpcAppCtrlSetState(hAC, GIAS_Zombie);
		TRACE("Enter Zombie state ...\n");
		pause();

		if(g_nLastSig >= 0)
		{
			TRACE("Received signal '%s'.\n", strsignal(g_nLastSig));
		}
	}

	if(hAC)
	{
//		TRACE("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(GIAS_Terminating));
		::GfaIpcAppCtrlSetState(hAC, GIAS_Terminating);
		TRACE("Releasing App Control ...\n");
		::GfaIpcAppCtrlRelease(hAC);
	}

	TRACE("Process exit.\n");
	return nRet;
}