io.gatling.http.client.body.multipart.impl.MultipartChunkedInput.java Source code

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Here is the source code for io.gatling.http.client.body.multipart.impl.MultipartChunkedInput.java

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/*
 * Copyright 2011-2018 GatlingCorp (https://gatling.io)
 *
 * Licensed 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
 *
 *  http://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.gatling.http.client.body.multipart.impl;

import static io.gatling.http.client.ahc.util.MiscUtils.*;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.stream.ChunkedInput;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

public class MultipartChunkedInput implements ChunkedInput<ByteBuf> {

    private enum ChunkedInputState {

        /**
         * There's something to read
         */
        CONTINUE,

        /**
         * There's nothing to read and input has to suspend
         */
        SUSPEND,

        /**
         * There's nothing to read and input has to stop
         */
        STOP
    }

    static final int DEFAULT_CHUNK_SIZE = 8 * 1024;

    private final List<PartImpl> parts;
    private final long contentLength;
    private final int chunkSize;
    private final AtomicBoolean closed = new AtomicBoolean();
    private boolean endOfInput;
    private long progress = 0L;
    private int currentPartIndex;
    private boolean done = false;

    public MultipartChunkedInput(List<PartImpl> parts, long contentLength) {
        this.parts = parts;
        this.contentLength = contentLength;
        this.chunkSize = contentLength > 0 ? (int) Math.min(contentLength, (long) DEFAULT_CHUNK_SIZE)
                : DEFAULT_CHUNK_SIZE;
    }

    @Override
    @Deprecated
    public ByteBuf readChunk(ChannelHandlerContext ctx) throws Exception {
        return readChunk(ctx.alloc());
    }

    @Override
    public ByteBuf readChunk(ByteBufAllocator alloc) throws Exception {

        if (endOfInput) {
            return null;
        }

        ByteBuf buffer = alloc.buffer(chunkSize);
        ChunkedInputState state = copyInto(buffer);
        progress += buffer.writerIndex();
        switch (state) {
        case STOP:
            endOfInput = true;
            return buffer;
        case SUSPEND:
            // this will suspend the stream in ChunkedWriteHandler
            buffer.release();
            return null;
        case CONTINUE:
            return buffer;
        default:
            throw new IllegalStateException("Unknown state: " + state);
        }
    }

    private ChunkedInputState copyInto(ByteBuf target) throws IOException {

        if (done) {
            return ChunkedInputState.STOP;
        }

        while (target.isWritable() && !done) {
            PartImpl currentPart = parts.get(currentPartIndex);
            currentPart.copyInto(target);

            if (currentPart.getState() == PartImplState.DONE) {
                currentPartIndex++;
                if (currentPartIndex == parts.size()) {
                    done = true;
                }
            }
        }

        return ChunkedInputState.CONTINUE;
    }

    @Override
    public boolean isEndOfInput() {
        return endOfInput;
    }

    @Override
    public void close() {
        if (closed.compareAndSet(false, true)) {
            for (PartImpl part : parts) {
                closeSilently(part);
            }
        }
    }

    @Override
    public long length() {
        return contentLength;
    }

    @Override
    public long progress() {
        return progress;
    }
}