org.analogweb.netty.AnalogwebChannelInitializer Maven / Gradle / Ivy

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package org.analogweb.netty;

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.SelfSignedCertificate;
import io.netty.util.concurrent.DefaultEventExecutorGroup;
import io.netty.util.concurrent.EventExecutorGroup;

import java.security.cert.CertificateException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.net.ssl.SSLException;

import org.analogweb.Application;
import org.analogweb.ApplicationContext;
import org.analogweb.ApplicationProperties;
import org.analogweb.core.ApplicationRuntimeException;
import org.analogweb.util.Assertion;
import org.analogweb.util.ClassCollector;
import org.analogweb.util.FileClassCollector;
import org.analogweb.util.JarClassCollector;
import org.analogweb.util.StringUtils;

/**
 * @author snowgooseyk
 */
public class AnalogwebChannelInitializer extends ChannelInitializer {

    protected static final boolean SSL = System.getProperty("ssl") != null;
    protected static final int DEFAULT_AGGREGATION_SIZE = 65535;
    protected static final String MAX_AGGREGATION_SIZE = "analogweb.netty.max.aggregation.size";
    private final SslContext sslCtx;
    private final Application app;
    private final ApplicationProperties properties;
    private final EventExecutorGroup handlerSpecificExecutorGroup = new DefaultEventExecutorGroup(8);

    public AnalogwebChannelInitializer(SslContext ssl, Application app,
            ApplicationContext contextResolver, ApplicationProperties props) {
        Assertion.notNull(app, Application.class.getName());
        this.sslCtx = ssl == null ? resolveSslContext() : ssl;
        this.properties = props;
        this.app = app;
        getApplication().run(contextResolver, getApplicationProperties(), getClassCollectors(),
                getClassLoader());
    }

    protected SslContext resolveSslContext() {
        final SslContext sslCtx;
        if (SSL) {
            try {
                final SelfSignedCertificate ssc = new SelfSignedCertificate();
                sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
            } catch (final SSLException e) {
                throw new ApplicationRuntimeException(e) {

                    private static final long serialVersionUID = 1L;
                };
            } catch (final CertificateException e) {
                throw new ApplicationRuntimeException(e) {

                    private static final long serialVersionUID = 1L;
                };
            }
        } else {
            sslCtx = null;
        }
        return sslCtx;
    }

    @Override
    public void initChannel(SocketChannel ch) throws Exception {
        final ChannelPipeline pipeline = ch.pipeline();
        final SslContext ssl = getSslContext();
        if (ssl != null) {
            pipeline.addLast(ssl.newHandler(ch.alloc()));
        }
        pipeline.addLast(new HttpServerCodec());
        pipeline.addLast(new HttpObjectAggregator(getMaxAggregationSize(getApplicationProperties())));
        pipeline.addLast(getHandlerSpecificExecutorGroup(), createServerHandler());
    }

    private int getMaxAggregationSize(ApplicationProperties applicationProperties) {
        String size = applicationProperties.getStringProperty(MAX_AGGREGATION_SIZE);
        if (StringUtils.isNotEmpty(size)) {
            try {
                return Integer.parseInt(size);
            } catch (NumberFormatException e) {
                // nop.
            }
        }
        return DEFAULT_AGGREGATION_SIZE;
    }

    protected ChannelHandler createServerHandler() {
        return new AnalogwebChannelInboundHandler(getApplication(), getApplicationProperties());
    }

    protected SslContext getSslContext() {
        return this.sslCtx;
    }

    protected Application getApplication() {
        return this.app;
    }

    protected ApplicationProperties getApplicationProperties() {
        return this.properties;
    }

    protected ClassLoader getClassLoader() {
        return Thread.currentThread().getContextClassLoader();
    }

    protected EventExecutorGroup getHandlerSpecificExecutorGroup() {
        return this.handlerSpecificExecutorGroup;
    }

    protected List getClassCollectors() {
        final List list = new ArrayList();
        list.add(new JarClassCollector());
        list.add(new FileClassCollector());
        return Collections.unmodifiableList(list);
    }
}