/*

 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @modules java.net.http

 *          java.logging

 *          jdk.httpserver

 * @library /test/lib

 * @build jdk.test.lib.net.SimpleSSLContext

 * @compile ../../../com/sun/net/httpserver/LogFilter.java

 * @compile ../../../com/sun/net/httpserver/EchoHandler.java

 * @compile ../../../com/sun/net/httpserver/FileServerHandler.java

 * @run main/othervm/timeout=40 ManyRequestsLegacy

 * @run main/othervm/timeout=40 -Dtest.insertDelay=true ManyRequestsLegacy

 * @run main/othervm/timeout=40 -Dtest.chunkSize=64 ManyRequestsLegacy

 * @run main/othervm/timeout=40 -Dtest.insertDelay=true

 *                              -Dtest.chunkSize=64 ManyRequestsLegacy

 * @summary Send a large number of requests asynchronously using the legacy

 *          URL.openConnection(), to help sanitize results of the test

 *          ManyRequest.java.

 */

import javax.net.ssl.HttpsURLConnection;

import javax.net.ssl.HostnameVerifier;

import com.sun.net.httpserver.HttpsConfigurator;

import com.sun.net.httpserver.HttpsParameters;

import com.sun.net.httpserver.HttpsServer;

import com.sun.net.httpserver.HttpExchange;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.InetAddress;

import java.net.URI;

import java.net.URLConnection;

import java.util.Optional;

import java.util.concurrent.CompletableFuture;

import java.util.stream.Collectors;

import javax.net.ssl.SSLContext;

import javax.net.ssl.SSLSession;

import java.net.http.HttpClient;

import java.net.http.HttpClient.Version;

import java.net.http.HttpHeaders;

import java.net.http.HttpRequest;

import java.net.http.HttpRequest.BodyPublishers;

import java.net.http.HttpResponse;

import java.net.InetSocketAddress;

import java.util.Arrays;

import java.util.Formatter;

import java.util.HashMap;

import java.util.LinkedList;

import java.util.Random;

import java.util.logging.Logger;

import java.util.logging.Level;

import jdk.test.lib.net.SimpleSSLContext;

import static java.net.Proxy.NO_PROXY;

public class ManyRequestsLegacy {

    volatile static int counter = 0;

    public static void main(String[] args) throws Exception {

        Logger logger = Logger.getLogger("com.sun.net.httpserver");

        logger.setLevel(Level.ALL);

        logger.info("TEST");

        System.out.println("Sending " + REQUESTS

                         + " requests; delay=" + INSERT_DELAY

                         + ", chunks=" + CHUNK_SIZE

                         + ", XFixed=" + XFIXED);

        SSLContext ctx = new SimpleSSLContext().get();

        SSLContext.setDefault(ctx);

        HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {

                public boolean verify(String hostname, SSLSession session) {

                    return true;

                }

            });

        InetSocketAddress addr = new InetSocketAddress(InetAddress.getLoopbackAddress(), 0);

        HttpsServer server = HttpsServer.create(addr, 0);

        server.setHttpsConfigurator(new Configurator(ctx));

        LegacyHttpClient client = new LegacyHttpClient();

        try {

            test(server, client);

            System.out.println("OK");

        } finally {

            server.stop(0);

        }

    }

    //static final int REQUESTS = 1000;

    static final int REQUESTS = 20;

    static final boolean INSERT_DELAY = Boolean.getBoolean("test.insertDelay");

    static final int CHUNK_SIZE = Math.max(0,

           Integer.parseInt(System.getProperty("test.chunkSize", "0")));

    static final boolean XFIXED = Boolean.getBoolean("test.XFixed");

    static class LegacyHttpClient {

        static final class LegacyHttpResponse implements HttpResponse<byte[]> {

            final HttpRequest request;

            final byte[] response;

            final int statusCode;

            public LegacyHttpResponse(HttpRequest request, int statusCode, byte[] response) {

                this.request = request;

                this.statusCode = statusCode;

                this.response = response;

            }

            private <T> T error() {

                throw new UnsupportedOperationException("Not supported yet.");

            }

            @Override

            public int statusCode() { return statusCode;}

            @Override

            public HttpRequest request() {return request;}

            @Override

            public Optional<HttpResponse<byte[]>> previousResponse() {return Optional.empty();}

            @Override

            public HttpHeaders headers() { return error(); }

            @Override

            public byte[] body() {return response;}

            @Override

            public Optional<SSLSession> sslSession() {

                return Optional.empty(); // for now

            }

            @Override

            public URI uri() { return request.uri();}

            @Override

            public HttpClient.Version version() { return Version.HTTP_1_1;}

        }

        private void debugCompleted(String tag, long startNanos, HttpRequest req) {

            System.err.println(tag + " elapsed "

                    + (System.nanoTime() - startNanos)/1000_000L

                    + " millis for " + req.method()

                    + " to " + req.uri());

        }

        CompletableFuture<? extends HttpResponse<byte[]>> sendAsync(HttpRequest r, byte[] buf) {

            long start = System.nanoTime();

            try {

                CompletableFuture<LegacyHttpResponse> cf = new CompletableFuture<>();

                URLConnection urlc = r.uri().toURL().openConnection(NO_PROXY);

                HttpURLConnection httpc = (HttpURLConnection)urlc;

                httpc.setRequestMethod(r.method());

                for (String s : r.headers().map().keySet()) {

                    httpc.setRequestProperty(s, r.headers().allValues(s)

                        .stream().collect(Collectors.joining(",")));

                }

                httpc.setDoInput(true);

                if (buf != null) httpc.setDoOutput(true);

                Thread t = new Thread(() -> {

                    try {

                        if (buf != null) {

                            try (OutputStream os = httpc.getOutputStream()) {

                                os.write(buf);

                                os.flush();

                            }

                        }

                        LegacyHttpResponse response = new LegacyHttpResponse(r,

                                httpc.getResponseCode(),httpc.getInputStream().readAllBytes());

                        cf.complete(response);

                    } catch(Throwable x) {

                        cf.completeExceptionally(x);

                    }

                });

                t.start();

                return cf.whenComplete((b,x) -> debugCompleted("ClientImpl (async)", start, r));

            } catch(Throwable t) {

                debugCompleted("ClientImpl (async)", start, r);

                return CompletableFuture.failedFuture(t);

            }

        }

    }

    static class TestEchoHandler extends EchoHandler {

        final Random rand = new Random();

        @Override

        public void handle(HttpExchange e) throws IOException {

            System.out.println("Server: received " + e.getRequestURI());

            super.handle(e);

        }

        @Override

        protected void close(HttpExchange t, OutputStream os) throws IOException {

            if (INSERT_DELAY) {

                try { Thread.sleep(rand.nextInt(200)); }

                catch (InterruptedException e) {}

            }

            System.out.println("Server: close outbound: " + t.getRequestURI());

            os.close();

        }

        @Override

        protected void close(HttpExchange t, InputStream is) throws IOException {

            if (INSERT_DELAY) {

                try { Thread.sleep(rand.nextInt(200)); }

                catch (InterruptedException e) {}

            }

            System.out.println("Server: close inbound: " + t.getRequestURI());

            is.close();

        }

    }

    static void test(HttpsServer server, LegacyHttpClient client) throws Exception {

        int port = server.getAddress().getPort();

        URI baseURI = new URI("https://localhost:" + port + "/foo/x");

        server.createContext("/foo", new TestEchoHandler());

        server.start();

        RequestLimiter limiter = new RequestLimiter(40);

        Random rand = new Random();

        CompletableFuture<?>[] results = new CompletableFuture<?>[REQUESTS];

        HashMap<HttpRequest,byte[]> bodies = new HashMap<>();

        for (int i=0; i<REQUESTS; i++) {

            byte[] buf = new byte[(i+1)*CHUNK_SIZE+i+1];  // different size bodies

            rand.nextBytes(buf);

            URI uri = new URI(baseURI.toString() + String.valueOf(i+1));

            HttpRequest r = HttpRequest.newBuilder(uri)

                                       .header("XFixed", "true")

                                       .POST(BodyPublishers.ofByteArray(buf))

                                       .build();

            bodies.put(r, buf);

            results[i] =

                limiter.whenOkToSend()

                       .thenCompose((v) -> {

                           System.out.println("Client: sendAsync: " + r.uri());

                           return client.sendAsync(r, buf);

                       })

                       .thenCompose((resp) -> {

                           limiter.requestComplete();

                           if (resp.statusCode() != 200) {

                               String s = "Expected 200, got: " + resp.statusCode();

                               System.out.println(s + " from "

                                                  + resp.request().uri().getPath());

                               return completedWithIOException(s);

                           } else {

                               counter++;

                               System.out.println("Result (" + counter + ") from "

                                                   + resp.request().uri().getPath());

                           }

                           return CompletableFuture.completedStage(resp.body())

                                      .thenApply((b) -> new Pair<>(resp, b));

                       })

                      .thenAccept((pair) -> {

                          HttpRequest request = pair.t.request();

                          byte[] requestBody = bodies.get(request);

                          check(Arrays.equals(requestBody, pair.u),

                                "bodies not equal:[" + bytesToHexString(requestBody)

                                + "] [" + bytesToHexString(pair.u) + "]");

                      });

        }

        // wait for them all to complete and throw exception in case of error

        CompletableFuture.allOf(results).join();

    }

    static <T> CompletableFuture<T> completedWithIOException(String message) {

        return CompletableFuture.failedFuture(new IOException(message));

    }

    static String bytesToHexString(byte[] bytes) {

        if (bytes == null)

            return "null";

        StringBuilder sb = new StringBuilder(bytes.length * 2);

        Formatter formatter = new Formatter(sb);

        for (byte b : bytes) {

            formatter.format("%02x", b);

        }

        return sb.toString();

    }

    static final class Pair<T,U> {

        Pair(T t, U u) {

            this.t = t; this.u = u;

        }

        T t;

        U u;

    }

    /**

     * A simple limiter for controlling the number of requests to be run in

     * parallel whenOkToSend() is called which returns a CF<Void> that allows

     * each individual request to proceed, or block temporarily (blocking occurs

     * on the waiters list here. As each request actually completes

     * requestComplete() is called to notify this object, and allow some

     * requests to continue.

     */

    static class RequestLimiter {

        static final CompletableFuture<Void> COMPLETED_FUTURE =

                CompletableFuture.completedFuture(null);

        final int maxnumber;

        final LinkedList<CompletableFuture<Void>> waiters;

        int number;

        boolean blocked;

        RequestLimiter(int maximum) {

            waiters = new LinkedList<>();

            maxnumber = maximum;

        }

        synchronized void requestComplete() {

            number--;

            // don't unblock until number of requests has halved.

            if ((blocked && number <= maxnumber / 2) ||

                        (!blocked && waiters.size() > 0)) {

                int toRelease = Math.min(maxnumber - number, waiters.size());

                for (int i=0; i<toRelease; i++) {

                    CompletableFuture<Void> f = waiters.remove();

                    number ++;

                    f.complete(null);

                }

                blocked = number >= maxnumber;

            }

        }

        synchronized CompletableFuture<Void> whenOkToSend() {

            if (blocked || number + 1 >= maxnumber) {

                blocked = true;

                CompletableFuture<Void> r = new CompletableFuture<>();

                waiters.add(r);

                return r;

            } else {

                number++;

                return COMPLETED_FUTURE;

            }

        }

    }

    static void check(boolean cond, Object... msg) {

        if (cond)

            return;

        StringBuilder sb = new StringBuilder();

        for (Object o : msg)

            sb.append(o);

        throw new RuntimeException(sb.toString());

    }

    static class Configurator extends HttpsConfigurator {

        public Configurator(SSLContext ctx) {

            super(ctx);

        }

        public void configure(HttpsParameters params) {

            params.setSSLParameters(getSSLContext().getSupportedSSLParameters());

        }

    }

}