| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.spdy.parser; |
| |
| import java.nio.ByteBuffer; |
| import java.util.EventListener; |
| import java.util.List; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| |
| import org.eclipse.jetty.spdy.CompressionFactory; |
| import org.eclipse.jetty.spdy.SessionException; |
| import org.eclipse.jetty.spdy.StreamException; |
| import org.eclipse.jetty.spdy.api.SessionStatus; |
| import org.eclipse.jetty.spdy.frames.ControlFrame; |
| import org.eclipse.jetty.spdy.frames.DataFrame; |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| public class Parser |
| { |
| private static final Logger logger = Log.getLogger(Parser.class); |
| private final List<Listener> listeners = new CopyOnWriteArrayList<>(); |
| private final ControlFrameParser controlFrameParser; |
| private final DataFrameParser dataFrameParser; |
| private State state = State.CONTROL_BIT; |
| |
| public Parser(CompressionFactory.Decompressor decompressor) |
| { |
| // It is important to allocate one decompression context per |
| // SPDY session for the control frames (to decompress the headers) |
| controlFrameParser = new ControlFrameParser(decompressor) |
| { |
| @Override |
| protected void onControlFrame(ControlFrame frame) |
| { |
| logger.debug("Parsed {}", frame); |
| notifyControlFrame(frame); |
| } |
| }; |
| dataFrameParser = new DataFrameParser() |
| { |
| @Override |
| protected void onDataFrame(DataFrame frame, ByteBuffer data) |
| { |
| logger.debug("Parsed {}, {} data bytes", frame, data.remaining()); |
| notifyDataFrame(frame, data); |
| } |
| }; |
| } |
| |
| public void addListener(Listener listener) |
| { |
| listeners.add(listener); |
| } |
| |
| public void removeListener(Listener listener) |
| { |
| listeners.remove(listener); |
| } |
| |
| protected void notifyControlFrame(ControlFrame frame) |
| { |
| for (Listener listener : listeners) |
| { |
| try |
| { |
| listener.onControlFrame(frame); |
| } |
| catch (Exception x) |
| { |
| logger.info("Exception while notifying listener " + listener, x); |
| } |
| } |
| } |
| |
| protected void notifyDataFrame(DataFrame frame, ByteBuffer data) |
| { |
| for (Listener listener : listeners) |
| { |
| try |
| { |
| listener.onDataFrame(frame, data); |
| } |
| catch (Exception x) |
| { |
| logger.info("Exception while notifying listener " + listener, x); |
| } |
| } |
| } |
| |
| protected void notifyStreamException(StreamException x) |
| { |
| for (Listener listener : listeners) |
| { |
| try |
| { |
| listener.onStreamException(x); |
| } |
| catch (Exception xx) |
| { |
| logger.debug("Could not notify listener " + listener, xx); |
| } |
| } |
| } |
| |
| protected void notifySessionException(SessionException x) |
| { |
| logger.debug("SPDY session exception", x); |
| for (Listener listener : listeners) |
| { |
| try |
| { |
| listener.onSessionException(x); |
| } |
| catch (Exception xx) |
| { |
| logger.debug("Could not notify listener " + listener, xx); |
| } |
| } |
| } |
| |
| public void parse(ByteBuffer buffer) |
| { |
| logger.debug("Parsing {} bytes", buffer.remaining()); |
| try |
| { |
| while (buffer.hasRemaining()) |
| { |
| try |
| { |
| switch (state) |
| { |
| case CONTROL_BIT: |
| { |
| // We must only peek the first byte and not advance the buffer |
| // because the 7 least significant bits may be relevant in data frames |
| int currByte = buffer.get(buffer.position()); |
| boolean isControlFrame = (currByte & 0x80) == 0x80; |
| state = isControlFrame ? State.CONTROL_FRAME : State.DATA_FRAME; |
| break; |
| } |
| case CONTROL_FRAME: |
| { |
| if (controlFrameParser.parse(buffer)) |
| reset(); |
| break; |
| } |
| case DATA_FRAME: |
| { |
| if (dataFrameParser.parse(buffer)) |
| reset(); |
| break; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| catch (StreamException x) |
| { |
| notifyStreamException(x); |
| } |
| } |
| } |
| catch (SessionException x) |
| { |
| notifySessionException(x); |
| } |
| catch (Throwable x) |
| { |
| notifySessionException(new SessionException(SessionStatus.PROTOCOL_ERROR, x)); |
| } |
| finally |
| { |
| // Be sure to consume after exceptions |
| buffer.position(buffer.limit()); |
| } |
| } |
| |
| private void reset() |
| { |
| state = State.CONTROL_BIT; |
| } |
| |
| public interface Listener extends EventListener |
| { |
| public void onControlFrame(ControlFrame frame); |
| |
| public void onDataFrame(DataFrame frame, ByteBuffer data); |
| |
| public void onStreamException(StreamException x); |
| |
| public void onSessionException(SessionException x); |
| |
| public static class Adapter implements Listener |
| { |
| @Override |
| public void onControlFrame(ControlFrame frame) |
| { |
| } |
| |
| @Override |
| public void onDataFrame(DataFrame frame, ByteBuffer data) |
| { |
| } |
| |
| @Override |
| public void onStreamException(StreamException x) |
| { |
| } |
| |
| @Override |
| public void onSessionException(SessionException x) |
| { |
| } |
| } |
| } |
| |
| private enum State |
| { |
| CONTROL_BIT, CONTROL_FRAME, DATA_FRAME |
| } |
| } |