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Java implementation of the Ethereum protocol adapted to use for Hedera Smart Contract Service
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/*
 * Copyright (c) [2016] [  ]
 * 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 .
 */
package org.ethereum.net.shh;

import org.ethereum.listener.EthereumListener;
import org.ethereum.net.MessageQueue;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

/**
 * Process the messages between peers with 'shh' capability on the network.
 *
 * Peers with 'shh' capability can send/receive:
 */
@Component
@Scope("prototype")
public class ShhHandler extends SimpleChannelInboundHandler {
    private final static Logger logger = LoggerFactory.getLogger("net.shh");
    public final static byte VERSION = 3;

    private MessageQueue msgQueue = null;
    private boolean active = false;
    private BloomFilter peerBloomFilter = BloomFilter.createAll();

    @Autowired
    private EthereumListener ethereumListener;

    @Autowired
    private WhisperImpl whisper;

    public ShhHandler() {
    }

    public ShhHandler(MessageQueue msgQueue) {
        this.msgQueue = msgQueue;
    }

    @Override
    public void channelRead0(final ChannelHandlerContext ctx, ShhMessage msg) throws InterruptedException {

        if (!isActive()) return;

        if (ShhMessageCodes.inRange(msg.getCommand().asByte()))
            logger.info("ShhHandler invoke: [{}]", msg.getCommand());

        ethereumListener.trace(String.format("ShhHandler invoke: [%s]", msg.getCommand()));

        switch (msg.getCommand()) {
            case STATUS:
                ethereumListener.trace("[Recv: " + msg + "]");
                break;
            case MESSAGE:
                whisper.processEnvelope((ShhEnvelopeMessage) msg, this);
                break;
            case FILTER:
                setBloomFilter((ShhFilterMessage) msg);
                break;
            default:
                logger.error("Unknown SHH message type: " + msg.getCommand());
                break;
        }
    }

    private void setBloomFilter(ShhFilterMessage msg) {
        peerBloomFilter = new BloomFilter(msg.getBloomFilter());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        logger.error("Shh handling failed", cause);
        super.exceptionCaught(ctx, cause);
        ctx.close();
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        active = false;
        whisper.removePeer(this);
        logger.debug("handlerRemoved: ... ");
    }

    public void activate() {
        logger.info("SHH protocol activated");
        ethereumListener.trace("SHH protocol activated");
        whisper.addPeer(this);
        sendStatus();
        sendHostBloom();
        this.active = true;
    }

    private void sendStatus() {
        byte protocolVersion = ShhHandler.VERSION;
        ShhStatusMessage msg = new ShhStatusMessage(protocolVersion);
        sendMessage(msg);
    }

    void sendHostBloom() {
        ShhFilterMessage msg = ShhFilterMessage.createFromFilter(whisper.hostBloomFilter.toBytes());
        sendMessage(msg);
    }

    void sendEnvelope(ShhEnvelopeMessage env) {
        sendMessage(env);
//        Topic[] topics = env.getTopics();
//        for (Topic topic : topics) {
//            if (peerBloomFilter.hasTopic(topic)) {
//                sendMessage(env);
//                break;
//            }
//        }
    }

    void sendMessage(ShhMessage msg) {
        msgQueue.sendMessage(msg);
    }

    public boolean isActive() {
        return active;
    }

    public void setMsgQueue(MessageQueue msgQueue) {
        this.msgQueue = msgQueue;
    }
}