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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty5.microbench.http;

import io.netty5.buffer.Buffer;
import io.netty5.buffer.MemoryManager;
import io.netty5.channel.embedded.EmbeddedChannel;
import io.netty5.handler.codec.http.HttpRequestDecoder;
import io.netty5.microbench.util.AbstractMicrobenchmark;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;

import java.nio.charset.StandardCharsets;

/**
 * This benchmark is based on HttpRequestDecoderTest class.
 */
@State(Scope.Benchmark)
@Warmup(iterations = 10)
@Measurement(iterations = 20)
public class HttpRequestDecoderBenchmark extends AbstractMicrobenchmark {

    private static final byte[] CONTENT_MIXED_DELIMITERS = createContent("\r\n", "\n");
    private static final int CONTENT_LENGTH = 120;

    @Param({ "2", "4", "8", "16", "32" })
    public int step;

    private static byte[] createContent(String... lineDelimiters) {
        String lineDelimiter;
        String lineDelimiter2;
        if (lineDelimiters.length == 2) {
            lineDelimiter = lineDelimiters[0];
            lineDelimiter2 = lineDelimiters[1];
        } else {
            lineDelimiter = lineDelimiters[0];
            lineDelimiter2 = lineDelimiters[0];
        }
        // This GET request is incorrect but it does not matter for HttpRequestDecoder.
        // It used only to get a long request.
        return ("GET /some/path?foo=bar&wibble=eek HTTP/1.1" + "\r\n" +
                "Upgrade: WebSocket" + lineDelimiter2 +
                "Connection: Upgrade" + lineDelimiter +
                "Host: localhost" + lineDelimiter2 +
                "Referer: http://www.site.ru/index.html" + lineDelimiter +
                "User-Agent: Mozilla/5.0 (X11; U; Linux i686; ru; rv:1.9b5) Gecko/2008050509 Firefox/3.0b5" +
                lineDelimiter2 +
                "Accept: text/html" + lineDelimiter +
                "Cookie: income=1" + lineDelimiter2 +
                "Origin: http://localhost:8080" + lineDelimiter +
                "Sec-WebSocket-Key1: 10  28 8V7 8 48     0" + lineDelimiter2 +
                "Sec-WebSocket-Key2: 8 Xt754O3Q3QW 0   _60" + lineDelimiter +
                "Content-Type: application/x-www-form-urlencoded" + lineDelimiter2 +
                "Content-Length: " + CONTENT_LENGTH + lineDelimiter +
                "\r\n"  +
                "1234567890\r\n" +
                "1234567890\r\n" +
                "1234567890\r\n" +
                "1234567890\r\n" +
                "1234567890\r\n" +
                "1234567890\r\n" +
                "1234567890\r\n" +
                "1234567890\r\n" +
                "1234567890\r\n" +
                "1234567890\r\n"
        ).getBytes(StandardCharsets.US_ASCII);
    }

    @Benchmark
    public void testDecodeWholeRequestInMultipleStepsMixedDelimiters() {
        testDecodeWholeRequestInMultipleSteps(CONTENT_MIXED_DELIMITERS, step);
    }

    private static void testDecodeWholeRequestInMultipleSteps(byte[] content, int fragmentSize) {
        final EmbeddedChannel channel = new EmbeddedChannel(new HttpRequestDecoder());

        final int headerLength = content.length - CONTENT_LENGTH;

        try (Buffer wrappedContent = MemoryManager.unsafeWrap(content)) {
            // split up the header
            for (int a = 0; a < headerLength;) {
                int amount = fragmentSize;
                if (a + amount > headerLength) {
                    amount = headerLength - a;
                }

                // if header is done it should produce an HttpRequest
                channel.writeInbound(wrappedContent.readSplit(amount));
                a += amount;
            }

            int readableBytes = wrappedContent.readableBytes();
            for (int i = CONTENT_LENGTH; i > 0; i--) {
                // Should produce HttpContent
                channel.writeInbound(wrappedContent.copy(readableBytes - i, 1, true));
            }
        }
    }
}