/*
* Copyright (c) [2016] [ <ether.camp> ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
*/
package org.ethereum.net.rlpx;
import com.google.common.io.ByteStreams;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageCodec;
import org.apache.commons.collections4.map.LRUMap;
import org.apache.commons.lang3.tuple.Pair;
import org.ethereum.config.SystemProperties;
import org.ethereum.listener.EthereumListener;
import org.ethereum.net.client.Capability;
import org.ethereum.net.eth.EthVersion;
import org.ethereum.net.eth.message.EthMessageCodes;
import org.ethereum.net.message.Message;
import org.ethereum.net.message.MessageFactory;
import org.ethereum.net.message.ReasonCode;
import org.ethereum.net.p2p.P2pMessageCodes;
import org.ethereum.net.server.Channel;
import org.ethereum.net.shh.ShhMessageCodes;
import org.ethereum.net.swarm.bzz.BzzMessageCodes;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.spongycastle.util.encoders.Hex;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import static java.lang.Math.min;
import static org.ethereum.net.rlpx.FrameCodec.Frame;
/**
* The Netty codec which encodes/decodes RPLx frames to subprotocol Messages
*/
@Component
@Scope("prototype")
public class MessageCodec extends MessageToMessageCodec<Frame, Message> {
private static final Logger loggerWire = LoggerFactory.getLogger("wire");
private static final Logger loggerNet = LoggerFactory.getLogger("net");
public static final int NO_FRAMING = Integer.MAX_VALUE >> 1;
private int maxFramePayloadSize = NO_FRAMING;
private Channel channel;
private MessageCodesResolver messageCodesResolver;
private MessageFactory p2pMessageFactory;
private MessageFactory ethMessageFactory;
private MessageFactory shhMessageFactory;
private MessageFactory bzzMessageFactory;
private EthVersion ethVersion;
@Autowired
EthereumListener ethereumListener;
private SystemProperties config;
private boolean supportChunkedFrames = true;
Map<Integer, Pair<? extends List<Frame>, AtomicInteger>> incompleteFrames = new LRUMap<>(16);
// LRU avoids OOM on invalid peers
AtomicInteger contextIdCounter = new AtomicInteger(1);
public MessageCodec() {
}
@Autowired
private MessageCodec(final SystemProperties config) {
this.config = config;
setMaxFramePayloadSize(config.rlpxMaxFrameSize());
}
@Override
protected void decode(ChannelHandlerContext ctx, Frame frame, List<Object> out) throws Exception {
Frame completeFrame = null;
if (frame.isChunked()) {
if (!supportChunkedFrames && frame.totalFrameSize > 0) {
throw new RuntimeException("Faming is not supported in this configuration.");
}
Pair<? extends List<Frame>, AtomicInteger> frameParts = incompleteFrames.get(frame.contextId);
if (frameParts == null) {
if (frame.totalFrameSize < 0) {
// loggerNet.warn("No initial frame received for context-id: " + frame.contextId + ". Discarding this frame as invalid.");
// TODO: refactor this logic (Cpp sends non-chunked frames with context-id)
Message message = decodeMessage(ctx, Collections.singletonList(frame));
if (message == null) return;
out.add(message);
return;
} else {
frameParts = Pair.of(new ArrayList<Frame>(), new AtomicInteger(0));
incompleteFrames.put(frame.contextId, frameParts);
}
} else {
if (frame.totalFrameSize >= 0) {
loggerNet.warn("Non-initial chunked frame shouldn't contain totalFrameSize field (context-id: " + frame.contextId + ", totalFrameSize: " + frame.totalFrameSize + "). Discarding this frame and all previous.");
incompleteFrames.remove(frame.contextId);
return;
}
}
frameParts.getLeft().add(frame);
int curSize = frameParts.getRight().addAndGet(frame.size);
if (loggerWire.isDebugEnabled())
loggerWire.debug("Recv: Chunked (" + curSize + " of " + frameParts.getLeft().get(0).totalFrameSize + ") [size: " + frame.getSize() + "]");
if (curSize > frameParts.getLeft().get(0).totalFrameSize) {
loggerNet.warn("The total frame chunks size (" + curSize + ") is greater than expected (" + frameParts.getLeft().get(0).totalFrameSize + "). Discarding the frame.");
incompleteFrames.remove(frame.contextId);
return;
}
if (curSize == frameParts.getLeft().get(0).totalFrameSize) {
Message message = decodeMessage(ctx, frameParts.getLeft());
incompleteFrames.remove(frame.contextId);
out.add(message);
}
} else {
Message message = decodeMessage(ctx, Collections.singletonList(frame));
out.add(message);
}
}
private Message decodeMessage(ChannelHandlerContext ctx, List<Frame> frames) throws IOException {
long frameType = frames.get(0).getType();
byte[] payload = new byte[frames.size() == 1 ? frames.get(0).getSize() : frames.get(0).totalFrameSize];
int pos = 0;
for (Frame frame : frames) {
pos += ByteStreams.read(frame.getStream(), payload, pos, frame.getSize());
}
if (loggerWire.isDebugEnabled())
loggerWire.debug("Recv: Encoded: {} [{}]", frameType, Hex.toHexString(payload));
Message msg;
try {
msg = createMessage((byte) frameType, payload);
} catch (Exception ex) {
loggerNet.debug("Incorrectly encoded message from: \t{}, dropping peer", channel);
channel.disconnect(ReasonCode.BAD_PROTOCOL);
return null;
}
if (loggerNet.isDebugEnabled())
loggerNet.debug("From: {} Recv: {}", channel, msg.toString());
ethereumListener.onRecvMessage(channel, msg);
channel.getNodeStatistics().rlpxInMessages.add();
return msg;
}
@Override
protected void encode(ChannelHandlerContext ctx, Message msg, List<Object> out) throws Exception {
String output = String.format("To: \t%s \tSend: \t%s", ctx.channel().remoteAddress(), msg);
ethereumListener.trace(output);
if (loggerNet.isDebugEnabled())
loggerNet.debug("To: {} Send: {}", channel, msg);
byte[] encoded = msg.getEncoded();
if (loggerWire.isDebugEnabled())
loggerWire.debug("Send: Encoded: {} [{}]", getCode(msg.getCommand()), Hex.toHexString(encoded));
List<Frame> frames = splitMessageToFrames(msg);
out.addAll(frames);
channel.getNodeStatistics().rlpxOutMessages.add();
}
private List<Frame> splitMessageToFrames(Message msg) {
byte code = getCode(msg.getCommand());
List<Frame> ret = new ArrayList<>();
byte[] bytes = msg.getEncoded();
int curPos = 0;
while(curPos < bytes.length) {
int newPos = min(curPos + maxFramePayloadSize, bytes.length);
byte[] frameBytes = curPos == 0 && newPos == bytes.length ? bytes :
Arrays.copyOfRange(bytes, curPos, newPos);
ret.add(new Frame(code, frameBytes));
curPos = newPos;
}
if (ret.size() > 1) {
// frame has been split
int contextId = contextIdCounter.getAndIncrement();
ret.get(0).totalFrameSize = bytes.length;
loggerWire.debug("Message (size " + bytes.length + ") split to " + ret.size() + " frames. Context-id: " + contextId);
for (Frame frame : ret) {
frame.contextId = contextId;
}
}
return ret;
}
public void setSupportChunkedFrames(boolean supportChunkedFrames) {
this.supportChunkedFrames = supportChunkedFrames;
if (!supportChunkedFrames) {
setMaxFramePayloadSize(NO_FRAMING);
}
}
/* TODO: this dirty hack is here cause we need to use message
TODO: adaptive id on high message abstraction level,
TODO: need a solution here*/
private byte getCode(Enum msgCommand){
byte code = 0;
if (msgCommand instanceof P2pMessageCodes){
code = messageCodesResolver.withP2pOffset(((P2pMessageCodes) msgCommand).asByte());
}
if (msgCommand instanceof EthMessageCodes){
code = messageCodesResolver.withEthOffset(((EthMessageCodes) msgCommand).asByte());
}
if (msgCommand instanceof ShhMessageCodes){
code = messageCodesResolver.withShhOffset(((ShhMessageCodes)msgCommand).asByte());
}
if (msgCommand instanceof BzzMessageCodes){
code = messageCodesResolver.withBzzOffset(((BzzMessageCodes) msgCommand).asByte());
}
return code;
}
private Message createMessage(byte code, byte[] payload) {
byte resolved = messageCodesResolver.resolveP2p(code);
if (p2pMessageFactory != null && P2pMessageCodes.inRange(resolved)) {
return p2pMessageFactory.create(resolved, payload);
}
resolved = messageCodesResolver.resolveEth(code);
if (ethMessageFactory != null && EthMessageCodes.inRange(resolved, ethVersion)) {
return ethMessageFactory.create(resolved, payload);
}
resolved = messageCodesResolver.resolveShh(code);
if (shhMessageFactory != null && ShhMessageCodes.inRange(resolved)) {
return shhMessageFactory.create(resolved, payload);
}
resolved = messageCodesResolver.resolveBzz(code);
if (bzzMessageFactory != null && BzzMessageCodes.inRange(resolved)) {
return bzzMessageFactory.create(resolved, payload);
}
throw new IllegalArgumentException("No such message: " + code + " [" + Hex.toHexString(payload) + "]");
}
public void setChannel(Channel channel){
this.channel = channel;
}
public void setEthVersion(EthVersion ethVersion) {
this.ethVersion = ethVersion;
}
public void setMaxFramePayloadSize(int maxFramePayloadSize) {
this.maxFramePayloadSize = maxFramePayloadSize;
}
public void initMessageCodes(List<Capability> caps) {
this.messageCodesResolver = new MessageCodesResolver(caps);
}
public void setP2pMessageFactory(MessageFactory p2pMessageFactory) {
this.p2pMessageFactory = p2pMessageFactory;
}
public void setEthMessageFactory(MessageFactory ethMessageFactory) {
this.ethMessageFactory = ethMessageFactory;
}
public void setShhMessageFactory(MessageFactory shhMessageFactory) {
this.shhMessageFactory = shhMessageFactory;
}
public void setBzzMessageFactory(MessageFactory bzzMessageFactory) {
this.bzzMessageFactory = bzzMessageFactory;
}
}