H2TlsAlpnRequestExecutionExample

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 * to you under the Apache License, Version 2.0 (the
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package org.apache.hc.core5.http2.examples;

import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Future;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLException;

import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpConnection;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.Message;
import org.apache.hc.core5.http.Method;
import org.apache.hc.core5.http.impl.bootstrap.HttpAsyncRequester;
import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
import org.apache.hc.core5.http.nio.entity.StringAsyncEntityConsumer;
import org.apache.hc.core5.http.nio.support.BasicRequestProducer;
import org.apache.hc.core5.http.nio.support.BasicResponseConsumer;
import org.apache.hc.core5.http2.config.H2Config;
import org.apache.hc.core5.http2.frame.RawFrame;
import org.apache.hc.core5.http2.impl.nio.H2StreamListener;
import org.apache.hc.core5.http2.impl.nio.bootstrap.H2RequesterBootstrap;
import org.apache.hc.core5.http2.ssl.H2ClientTlsStrategy;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.net.NamedEndpoint;
import org.apache.hc.core5.reactor.ssl.SSLSessionVerifier;
import org.apache.hc.core5.reactor.ssl.TlsDetails;
import org.apache.hc.core5.ssl.SSLContexts;
import org.apache.hc.core5.util.Timeout;

/**
 * This example demonstrates how to execute HTTP/2 requests over TLS connections.
 * <p>
 * It requires Java runtime with ALPN protocol support (such as Oracle JRE 9 or newer).
 */
public class H2TlsAlpnRequestExecutionExample {

    public final static void main(final String[] args) throws Exception {
        // Create and start requester
        final H2Config h2Config = H2Config.custom()
                .setPushEnabled(false)
                .build();

        final HttpAsyncRequester requester = H2RequesterBootstrap.bootstrap()
                .setH2Config(h2Config)
                .setTlsStrategy(new H2ClientTlsStrategy(SSLContexts.createSystemDefault(), new SSLSessionVerifier() {

                    @Override
                    public TlsDetails verify(final NamedEndpoint endpoint, final SSLEngine sslEngine) throws SSLException {
                        // IMPORTANT uncomment the following line when running Java 9 or older
                        // in order to avoid the illegal reflective access operation warning
                        // ====
                        // return new TlsDetails(sslEngine.getSession(), sslEngine.getApplicationProtocol());
                        // ====
                        return null;
                    }

                }))
                .setStreamListener(new H2StreamListener() {

                    @Override
                    public void onHeaderInput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
                        for (int i = 0; i < headers.size(); i++) {
                            System.out.println(connection.getRemoteAddress() + " (" + streamId + ") << " + headers.get(i));
                        }
                    }

                    @Override
                    public void onHeaderOutput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
                        for (int i = 0; i < headers.size(); i++) {
                            System.out.println(connection.getRemoteAddress() + " (" + streamId + ") >> " + headers.get(i));
                        }
                    }

                    @Override
                    public void onFrameInput(final HttpConnection connection, final int streamId, final RawFrame frame) {
                    }

                    @Override
                    public void onFrameOutput(final HttpConnection connection, final int streamId, final RawFrame frame) {
                    }

                    @Override
                    public void onInputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
                    }

                    @Override
                    public void onOutputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
                    }

                })
                .create();
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                System.out.println("HTTP requester shutting down");
                requester.close(CloseMode.GRACEFUL);
            }
        });
        requester.start();

        final HttpHost target = new HttpHost("https", "nghttp2.org", 443);
        final String[] requestUris = new String[] {"/httpbin/ip", "/httpbin/user-agent", "/httpbin/headers"};

        final CountDownLatch latch = new CountDownLatch(requestUris.length);
        for (final String requestUri: requestUris) {
            final Future<AsyncClientEndpoint> future = requester.connect(target, Timeout.ofSeconds(5));
            final AsyncClientEndpoint clientEndpoint = future.get();
            clientEndpoint.execute(
                    new BasicRequestProducer(Method.GET, target, requestUri),
                    new BasicResponseConsumer<>(new StringAsyncEntityConsumer()),
                    new FutureCallback<Message<HttpResponse, String>>() {

                        @Override
                        public void completed(final Message<HttpResponse, String> message) {
                            clientEndpoint.releaseAndReuse();
                            final HttpResponse response = message.getHead();
                            final String body = message.getBody();
                            System.out.println(requestUri + "->" + response.getCode() + " " + response.getVersion());
                            System.out.println(body);
                            latch.countDown();
                        }

                        @Override
                        public void failed(final Exception ex) {
                            clientEndpoint.releaseAndDiscard();
                            System.out.println(requestUri + "->" + ex);
                            latch.countDown();
                        }

                        @Override
                        public void cancelled() {
                            clientEndpoint.releaseAndDiscard();
                            System.out.println(requestUri + " cancelled");
                            latch.countDown();
                        }

                    });
        }

        latch.await();
        System.out.println("Shutting down I/O reactor");
        requester.initiateShutdown();
    }

}