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/**
 * This file is part of Graylog2.
 *
 * Graylog2 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 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog2 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 Graylog2.  If not, see .
 */
package org.graylog2.inputs.gelf.tcp;

import com.codahale.metrics.Gauge;
import com.codahale.metrics.MetricRegistry;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.graylog2.inputs.gelf.GELFInputBase;
import org.graylog2.inputs.gelf.gelf.GELFChunkManager;
import org.graylog2.plugin.buffers.Buffer;
import org.graylog2.plugin.configuration.Configuration;
import org.graylog2.plugin.inputs.MisfireException;
import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.inject.Inject;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * @author Lennart Koopmann 
 */
public class GELFTCPInput extends GELFInputBase {

    private static final Logger LOG = LoggerFactory.getLogger(GELFTCPInput.class);

    public static final String NAME = "GELF TCP";
    private final MetricRegistry metricRegistry;
    private final GELFChunkManager gelfChunkManager;

    @Inject
    public GELFTCPInput(MetricRegistry metricRegistry,
                        GELFChunkManager gelfChunkManager) {
        this.metricRegistry = metricRegistry;
        this.gelfChunkManager = gelfChunkManager;
    }

    @Override
    public void initialize(Configuration configuration) {
        super.initialize(configuration);

        // Register throughput counter gauges.
        for(Map.Entry> gauge : throughputCounter.gauges().entrySet()) {
            metricRegistry.register(MetricRegistry.name(getUniqueReadableId(), gauge.getKey()), gauge.getValue());
        }

        // Register connection counter gauges.
        metricRegistry.register(MetricRegistry.name(getUniqueReadableId(), "open_connections"), connectionCounter.gaugeCurrent());
        metricRegistry.register(MetricRegistry.name(getUniqueReadableId(), "total_connections"), connectionCounter.gaugeTotal());
    }

    @Override
    public void launch(Buffer processBuffer) throws MisfireException {
        final ExecutorService bossThreadPool = Executors.newCachedThreadPool(
                new ThreadFactoryBuilder()
                        .setNameFormat("input-" + getId() + "-gelftcp-boss-%d")
                        .build());

        final ExecutorService workerThreadPool = Executors.newCachedThreadPool(
                new ThreadFactoryBuilder()
                        .setNameFormat("input-" + getId() + "-gelftcp-worker-%d")
                        .build());

        bootstrap = new ServerBootstrap(
                new NioServerSocketChannelFactory(bossThreadPool, workerThreadPool)
        );

        bootstrap.setPipelineFactory(new GELFTCPPipelineFactory(metricRegistry, processBuffer,
                gelfChunkManager, this, throughputCounter, connectionCounter));
        bootstrap.setOption("child.receiveBufferSize", getRecvBufferSize());

        try {
            channel = ((ServerBootstrap) bootstrap).bind(socketAddress);
            LOG.info("Started TCP GELF input on {}", socketAddress);
        } catch (Exception e) {
            String msg = "Could not bind TCP GELF input to address " + socketAddress;
            LOG.error(msg, e);
            throw new MisfireException(msg);
        }
    }

    @Override
    public String getName() {
        return NAME;
    }

}