com.fireflysource.net.http.common.v2.decoder.PingBodyParser Maven / Gradle / Ivy

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package com.fireflysource.net.http.common.v2.decoder;

import com.fireflysource.net.http.common.v2.frame.ErrorCode;
import com.fireflysource.net.http.common.v2.frame.Flags;
import com.fireflysource.net.http.common.v2.frame.PingFrame;

import java.nio.ByteBuffer;

public class PingBodyParser extends BodyParser {
    private State state = State.PREPARE;
    private int cursor;
    private byte[] payload;

    public PingBodyParser(HeaderParser headerParser, Parser.Listener listener) {
        super(headerParser, listener);
    }

    private void reset() {
        state = State.PREPARE;
        cursor = 0;
        payload = null;
    }

    @Override
    public boolean parse(ByteBuffer buffer) {
        while (buffer.hasRemaining()) {
            switch (state) {
                case PREPARE: {
                    // SPEC: wrong streamId is treated as connection error.
                    if (getStreamId() != 0)
                        return connectionFailure(buffer, ErrorCode.PROTOCOL_ERROR.code, "invalid_ping_frame");
                    // SPEC: wrong body length is treated as connection error.
                    if (getBodyLength() != 8)
                        return connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "invalid_ping_frame");
                    state = State.PAYLOAD;
                    break;
                }
                case PAYLOAD: {
                    payload = new byte[8];
                    if (buffer.remaining() >= 8) {
                        buffer.get(payload);
                        return onPing(payload);
                    } else {
                        state = State.PAYLOAD_BYTES;
                        cursor = 8;
                    }
                    break;
                }
                case PAYLOAD_BYTES: {
                    payload[8 - cursor] = buffer.get();
                    --cursor;
                    if (cursor == 0)
                        return onPing(payload);
                    break;
                }
                default: {
                    throw new IllegalStateException();
                }
            }
        }
        return false;
    }

    private boolean onPing(byte[] payload) {
        PingFrame frame = new PingFrame(payload, hasFlag(Flags.ACK));
        reset();
        notifyPing(frame);
        return true;
    }

    private enum State {
        PREPARE, PAYLOAD, PAYLOAD_BYTES
    }
}