text: // Copyright (c) 2010 Satoshi Nakamoto
  // Copyright (c) 2009-2012 The Bitcoin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "rpcserver.h"
  #include "main.h"
  #include "kernel.h"
  #include "checkpoints.h"
  
  using namespace json_spirit;
  using namespace std;
  
  extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, json_spirit::Object& entry);
  
  double GetDifficulty(const CBlockIndex* blockindex)
  {
      // Floating point number that is a multiple of the minimum difficulty,
      // minimum difficulty = 1.0.
      if (blockindex == NULL)
      {
          if (pindexBest == NULL)
              return 1.0;
          else
              blockindex = GetLastBlockIndex(pindexBest, false);
      }
  
      int nShift = (blockindex->nBits >> 24) & 0xff;
  
      double dDiff =
          (double)0x0000ffff / (double)(blockindex->nBits & 0x00ffffff);
  
      while (nShift < 29)
      {
          dDiff *= 256.0;
          nShift++;
      }
      while (nShift > 29)
      {
          dDiff /= 256.0;
          nShift--;
      }
  
      return dDiff;
  }
  
  double GetPoWMHashPS()
  {
      if (pindexBest->nHeight >= Params().LastPOWBlock())
          return 0;
  
      int nPoWInterval = 72;
      int64_t nTargetSpacingWorkMin = 30, nTargetSpacingWork = 30;
  
      CBlockIndex* pindex = pindexGenesisBlock;
      CBlockIndex* pindexPrevWork = pindexGenesisBlock;
  
      while (pindex)
      {
          if (pindex->IsProofOfWork())
          {
              int64_t nActualSpacingWork = pindex->GetBlockTime() - pindexPrevWork->GetBlockTime();
              nTargetSpacingWork = ((nPoWInterval - 1) * nTargetSpacingWork + nActualSpacingWork + nActualSpacingWork) / (nPoWInterval + 1);
              nTargetSpacingWork = max(nTargetSpacingWork, nTargetSpacingWorkMin);
              pindexPrevWork = pindex;
          }
  
          pindex = pindex->pnext;
      }
  
      return GetDifficulty() * 4294.967296 / nTargetSpacingWork;
  }
  
  double GetPoSKernelPS()
  {
      int nPoSInterval = 72;
      double dStakeKernelsTriedAvg = 0;
      int nStakesHandled = 0, nStakesTime = 0;
  
      CBlockIndex* pindex = pindexBest;;
      CBlockIndex* pindexPrevStake = NULL;
  
      while (pindex && nStakesHandled < nPoSInterval)
      {
          if (pindex->IsProofOfStake())
          {
              if (pindexPrevStake)
              {
                  dStakeKernelsTriedAvg += GetDifficulty(pindexPrevStake) * 4294967296.0;
                  nStakesTime += pindexPrevStake->nTime - pindex->nTime;
                  nStakesHandled++;
              }
              pindexPrevStake = pindex;
          }
  
          pindex = pindex->pprev;
      }
  
      double result = 0;
  
      if (nStakesTime)
          result = dStakeKernelsTriedAvg / nStakesTime;
  
      result *= STAKE_TIMESTAMP_MASK + 1;
  
      return result;
  }
  
  Object blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool fPrintTransactionDetail)
  {
      Object result;
      result.push_back(Pair("hash", block.GetHash().GetHex()));
      int confirmations = -1;
      // Only report confirmations if the block is on the main chain
      if (blockindex->IsInMainChain())
          confirmations = nBestHeight - blockindex->nHeight + 1;
      result.push_back(Pair("confirmations", confirmations));
      result.push_back(Pair("size", (int)::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION)));
      result.push_back(Pair("height", blockindex->nHeight));
      result.push_back(Pair("version", block.nVersion));
      result.push_back(Pair("merkleroot", block.hashMerkleRoot.GetHex()));
  #ifndef LOWMEM
      result.push_back(Pair("mint", ValueFromAmount(blockindex->nMint)));
  #endif
      result.push_back(Pair("moneysupply", ValueFromAmount(blockindex->nMoneySupply)));
      result.push_back(Pair("time", (int64_t)block.GetBlockTime()));
      result.push_back(Pair("nonce", (uint64_t)block.nNonce));
      result.push_back(Pair("bits", strprintf("%08x", block.nBits)));
      result.push_back(Pair("difficulty", GetDifficulty(blockindex)));
      result.push_back(Pair("blocktrust", leftTrim(blockindex->GetBlockTrust().GetHex(), '0')));
      result.push_back(Pair("chaintrust", leftTrim(blockindex->nChainTrust.GetHex(), '0')));
      if (blockindex->pprev)
          result.push_back(Pair("previousblockhash", blockindex->pprev->GetBlockHash().GetHex()));
      if (blockindex->pnext)
          result.push_back(Pair("nextblockhash", blockindex->pnext->GetBlockHash().GetHex()));
  
      result.push_back(Pair("flags", strprintf("%s%s", blockindex->IsProofOfStake()? "proof-of-stake" : "proof-of-work", blockindex->GeneratedStakeModifier()? " stake-modifier": "")));
      result.push_back(Pair("proofhash", blockindex->hashProof.GetHex()));
      result.push_back(Pair("entropybit", (int)blockindex->GetStakeEntropyBit()));
      result.push_back(Pair("modifier", strprintf("%016x", blockindex->nStakeModifier)));
      Array txinfo;
      BOOST_FOREACH (const CTransaction& tx, block.vtx)
      {
          if (fPrintTransactionDetail)
          {
              Object entry;
  
              entry.push_back(Pair("txid", tx.GetHash().GetHex()));
              TxToJSON(tx, 0, entry);
  
              txinfo.push_back(entry);
          }
          else
              txinfo.push_back(tx.GetHash().GetHex());
      }
  
      result.push_back(Pair("tx", txinfo));
  
      if (block.IsProofOfStake())
          result.push_back(Pair("signature", HexStr(block.vchBlockSig.begin(), block.vchBlockSig.end())));
  
      return result;
  }
  
  Value getbestblockhash(const Array& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getbestblockhash\n"
              "Returns the hash of the best block in the longest block chain.");
  
      return hashBestChain.GetHex();
  }
  
  Value getblockcount(const Array& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getblockcount\n"
              "Returns the number of blocks in the longest block chain.");
  
      return nBestHeight;
  }
  
  
  Value getdifficulty(const Array& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getdifficulty\n"
              "Returns the difficulty as a multiple of the minimum difficulty.");
  
      Object obj;
      obj.push_back(Pair("proof-of-work",        GetDifficulty()));
      obj.push_back(Pair("proof-of-stake",       GetDifficulty(GetLastBlockIndex(pindexBest, true))));
      return obj;
  }
  
  
  Value getrawmempool(const Array& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getrawmempool\n"
              "Returns all transaction ids in memory pool.");
  
      vector<uint256> vtxid;
      mempool.queryHashes(vtxid);
  
      Array a;
      BOOST_FOREACH(const uint256& hash, vtxid)
          a.push_back(hash.ToString());
  
      return a;
  }
  
  Value getblockhash(const Array& params, bool fHelp)
  {
      if (fHelp || params.size() != 1)
          throw runtime_error(
              "getblockhash <index>\n"
              "Returns hash of block in best-block-chain at <index>.");
  
      int nHeight = params[0].get_int();
      if (nHeight < 0 || nHeight > nBestHeight)
          throw runtime_error("Block number out of range.");
  
      CBlockIndex* pblockindex = FindBlockByHeight(nHeight);
      return pblockindex->phashBlock->GetHex();
  }
  
  Value getblock(const Array& params, bool fHelp)
  {
      if (fHelp || params.size() < 1 || params.size() > 2)
          throw runtime_error(
              "getblock <hash> [txinfo]\n"
              "txinfo optional to print more detailed tx info\n"
              "Returns details of a block with given block-hash.");
  
      std::string strHash = params[0].get_str();
      uint256 hash(strHash);
  
      if (mapBlockIndex.count(hash) == 0)
          throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
  
      CBlock block;
      CBlockIndex* pblockindex = mapBlockIndex[hash];
      block.ReadFromDisk(pblockindex, true);
  
      return blockToJSON(block, pblockindex, params.size() > 1 ? params[1].get_bool() : false);
  }
  
  Value getblockbynumber(const Array& params, bool fHelp)
  {
      if (fHelp || params.size() < 1 || params.size() > 2)
          throw runtime_error(
              "getblockbynumber <number> [txinfo]\n"
              "txinfo optional to print more detailed tx info\n"
              "Returns details of a block with given block-number.");
  
      int nHeight = params[0].get_int();
      if (nHeight < 0 || nHeight > nBestHeight)
          throw runtime_error("Block number out of range.");
  
      CBlock block;
      CBlockIndex* pblockindex = mapBlockIndex[hashBestChain];
      while (pblockindex->nHeight > nHeight)
          pblockindex = pblockindex->pprev;
  
      uint256 hash = *pblockindex->phashBlock;
  
      pblockindex = mapBlockIndex[hash];
      block.ReadFromDisk(pblockindex, true);
  
      return blockToJSON(block, pblockindex, params.size() > 1 ? params[1].get_bool() : false);
  }
  
  // ppcoin: get information of sync-checkpoint
  Value getcheckpoint(const Array& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getcheckpoint\n"
              "Show info of synchronized checkpoint.\n");
  
      Object result;
      const CBlockIndex* pindexCheckpoint = Checkpoints::AutoSelectSyncCheckpoint();
  
      result.push_back(Pair("synccheckpoint", pindexCheckpoint->GetBlockHash().ToString().c_str()));
      result.push_back(Pair("height", pindexCheckpoint->nHeight));
      result.push_back(Pair("timestamp", DateTimeStrFormat(pindexCheckpoint->GetBlockTime()).c_str()));
  
      result.push_back(Pair("policy", "rolling"));
  
      return result;
  }
  