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The Async Http Client (AHC) classes.

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/*
 *    Copyright (c) 2015-2023 AsyncHttpClient Project. All rights reserved.
 *
 *    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 org.asynchttpclient.request.body.generator;

import io.netty.buffer.ByteBuf;
import org.asynchttpclient.request.body.Body;

import java.util.Queue;

public final class PushBody implements Body {

    private final Queue queue;
    private BodyState state = BodyState.CONTINUE;

    public PushBody(Queue queue) {
        this.queue = queue;
    }

    @Override
    public long getContentLength() {
        return -1;
    }

    @Override
    public BodyState transferTo(final ByteBuf target) {
        switch (state) {
            case CONTINUE:
                return readNextChunk(target);
            case STOP:
                return BodyState.STOP;
            default:
                throw new IllegalStateException("Illegal process state.");
        }
    }

    private BodyState readNextChunk(ByteBuf target) {
        BodyState res = BodyState.SUSPEND;
        while (target.isWritable() && state != BodyState.STOP) {
            BodyChunk nextChunk = queue.peek();
            if (nextChunk == null) {
                // Nothing in the queue. suspend stream if nothing was read. (reads == 0)
                return res;
            } else if (!nextChunk.buffer.isReadable() && !nextChunk.last) {
                // skip empty buffers
                queue.remove();
            } else {
                res = BodyState.CONTINUE;
                readChunk(target, nextChunk);
            }
        }
        return res;
    }

    private void readChunk(ByteBuf target, BodyChunk part) {
        target.writeBytes(part.buffer);
        if (!part.buffer.isReadable()) {
            if (part.last) {
                state = BodyState.STOP;
            }
            queue.remove();
        }
    }

    @Override
    public void close() {
    }
}