CaliperSensorGroup.cpp 5.12 KB
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//================================================================================
// Name        : CaliperSensorGroup.cpp
// Author      : Micha Mueller
// Copyright   : Leibniz Supercomputing Centre
// Description : Source file for Caliper sensor group class.
//================================================================================

//================================================================================
// This file is part of DCDB (DataCenter DataBase)
// Copyright (C) 2019-2019 Leibniz Supercomputing Centre
//
// 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 (at your option) 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, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//================================================================================

#include "CaliperSensorGroup.h"

#include <errno.h>
#include <stdio.h>
#include <sys/socket.h>

#include "timestamp.h"

CaliperSensorGroup::CaliperSensorGroup(const std::string& name) :
	SensorGroupTemplate(name),
	_socket(-1),
	_connection(-1) {
}

CaliperSensorGroup::CaliperSensorGroup(const CaliperSensorGroup& other) :
  SensorGroupTemplate(other),
  _socket(-1),
  _connection(-1) {
}

CaliperSensorGroup::~CaliperSensorGroup() {
	if(_keepRunning) {
	    stop();
	}
}

CaliperSensorGroup& CaliperSensorGroup::operator=(const CaliperSensorGroup& other) {
  SensorGroupTemplate::operator=(other); 
  _socket = -1;
  _connection = -1;
  
  return *this;
}

void CaliperSensorGroup::start() {
	if (_keepRunning) {
		//we have been started already
		LOG(info) << "Sensorgroup " << _groupName << " already running.";
		return;
	}

	_socket = socket(AF_UNIX, SOCK_SEQPACKET | SOCK_NONBLOCK, 0);

	if(_socket == -1) {
	    LOG(error) << _groupName << ": Failed to open socket:" << strerror(errno);
	    return;
	}

	sockaddr_un addr;
	memset(&addr, 0, sizeof(struct sockaddr_un));

	addr.sun_family = AF_UNIX;
	snprintf(&addr.sun_path[1], 91, "DCDBPusherCaliSocket");

	if(bind(_socket, (struct sockaddr*) &addr, sizeof(addr))) {
	    LOG(error) << _groupName << ": Failed to bind socket:" << strerror(errno);
	    close(_socket);
	    _socket = -1;
	    return;
	}

	if(listen(_socket, 1)) {
	    LOG(error) << _groupName << ": Can not listen on socket:" << strerror(errno);
	    close(_socket);
	    _socket = -1;
	    return;
	}

    _keepRunning = 1;
	_pendingTasks++;
	_timer->async_wait(std::bind(&CaliperSensorGroup::readAsync, this));
	LOG(info) << "Sensorgroup " << _groupName << " started.";
}

void CaliperSensorGroup::stop() {
    _keepRunning = 0;

    //wait before closing _file
    wait();

    if(_connection != -1) {
        close(_connection);
        _connection = -1;
    }
    if(_socket != -1) {
        close(_socket);
        _socket = -1;
    }

    LOG(info) << "Sensorgroup " << _groupName << " stopped.";
}

void CaliperSensorGroup::read() {
    if (_connection == -1) {
        _connection = accept(_socket, NULL, NULL);
        if (_connection == -1) {
            if (errno != EAGAIN && errno != EWOULDBLOCK) {
                LOG(error) << _groupName << ": Accept failed:" << strerror(errno);
            }
            return;
        }
    }

    const size_t bufSize = 2048;
    char buf[bufSize];
    const ssize_t nrec = recv(_connection, (void *) buf, bufSize, MSG_DONTWAIT);

    if (nrec == 0) {
        close(_connection);
        _connection = -1;
        return;
    } else if (nrec == -1) {
        if (errno != EAGAIN && errno != EWOULDBLOCK) {
            LOG(error) << _groupName << ": Recv failed: " << strerror(errno);
        }
        return;
    } else {
        std::string timestamp(buf);
        std::string function(&(buf[timestamp.length()+1]));
        LOG(info) << _groupName << ": Received value " << function << " (" << timestamp << ")";
    }


/*    reading_t reading;
	reading.timestamp = getTimestamp();

	try {
		for(auto s : _sensors) {
			reading.value =  *
							 *  TODO
							 *  Read a value for every sensor affiliated with this group and store
							 *  it with the appropriate sensor.
							 * 0;
			s->storeReading(reading);
#ifdef DEBUG
			LOG(debug) << _groupName << "::" << s->getName() << " raw reading: \"" << reading.value << "\"";
#endif
		}
	} catch (const std::exception& e) {
		LOG(error) << "Sensorgroup" << _groupName << " could not read value: " << e.what();
	}*/
}

void CaliperSensorGroup::readAsync() {
	uint64_t now = getTimestamp();
	read();
	if (_timer && _keepRunning) {
		_timer->expires_at(timestamp2ptime(nextReadingTime()));
		_pendingTasks++;
		_timer->async_wait(std::bind(&CaliperSensorGroup::readAsync, this));
	}
	_pendingTasks--;
}

void CaliperSensorGroup::printConfig(LOG_LEVEL ll) {

}