GetBlockchainStatus.java

/******************************************************************************
 * Copyright © 2013-2016 The Nxt Core Developers.                             *
 *                                                                            *
 * See the AUTHORS.txt, DEVELOPER-AGREEMENT.txt and LICENSE.txt files at      *
 * the top-level directory of this distribution for the individual copyright  *
 * holder information and the developer policies on copyright and licensing.  *
 *                                                                            *
 * Unless otherwise agreed in a custom licensing agreement, no part of the    *
 * Nxt software, including this file, may be copied, modified, propagated,    *
 * or distributed except according to the terms contained in the LICENSE.txt  *
 * file.                                                                      *
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 * Removal or modification of this copyright notice is prohibited.            *
 *                                                                            *
 ******************************************************************************/

package nxt.http;

import nxt.Block;
import nxt.BlockchainProcessor;
import nxt.Constants;
import nxt.Nxt;
import nxt.peer.Peer;
import nxt.peer.Peers;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

import javax.servlet.http.HttpServletRequest;

public final class GetBlockchainStatus extends APIServlet.APIRequestHandler {

    static final GetBlockchainStatus instance = new GetBlockchainStatus();

    private GetBlockchainStatus() {
        super(new APITag[] {APITag.BLOCKS, APITag.INFO});
    }

    @Override
    JSONObject processRequest(HttpServletRequest req) {
        JSONObject response = new JSONObject();
        response.put("application", Nxt.APPLICATION);
        response.put("version", Nxt.VERSION);
        response.put("time", Nxt.getEpochTime());
        Block lastBlock = Nxt.getBlockchain().getLastBlock();
        response.put("lastBlock", lastBlock.getStringId());
        response.put("cumulativeDifficulty", lastBlock.getCumulativeDifficulty().toString());
        response.put("numberOfBlocks", lastBlock.getHeight() + 1);
        BlockchainProcessor blockchainProcessor = Nxt.getBlockchainProcessor();
        Peer lastBlockchainFeeder = blockchainProcessor.getLastBlockchainFeeder();
        response.put("lastBlockchainFeeder", lastBlockchainFeeder == null ? null : lastBlockchainFeeder.getAnnouncedAddress());
        response.put("lastBlockchainFeederHeight", blockchainProcessor.getLastBlockchainFeederHeight());
        response.put("isScanning", blockchainProcessor.isScanning());
        response.put("isDownloading", blockchainProcessor.isDownloading());
        response.put("maxRollback", Constants.MAX_ROLLBACK);
        response.put("currentMinRollbackHeight", Nxt.getBlockchainProcessor().getMinRollbackHeight());
        response.put("isTestnet", Constants.isTestnet);
        response.put("maxPrunableLifetime", Constants.MAX_PRUNABLE_LIFETIME);
        response.put("includeExpiredPrunable", Constants.INCLUDE_EXPIRED_PRUNABLE);
        response.put("correctInvalidFees", Constants.correctInvalidFees);
        JSONArray servicesArray = new JSONArray();
        Peers.getServices().forEach(service -> servicesArray.add(service.name()));
        response.put("services", servicesArray);
        return response;
    }

    @Override
    boolean allowRequiredBlockParameters() {
        return false;
    }

}