src/rest.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2015 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #include "chain.h"
   7 #include "chainparams.h"
   8 #include "primitives/block.h"
   9 #include "primitives/transaction.h"
  10 #include "main.h"
  11 #include "httpserver.h"
  12 #include "rpc/server.h"
  13 #include "streams.h"
  14 #include "sync.h"
  15 #include "txmempool.h"
  16 #include "utilstrencodings.h"
  17 #include "version.h"
  18
  19 #include <boost/algorithm/string.hpp>
  20 #include <boost/dynamic_bitset.hpp>
  21
  22 #include <univalue.h>
  23
  24 using namespace std;
  25
  26 static const size_t MAX_GETUTXOS_OUTPOINTS = 15; //allow a max of 15 outpoints to be queried at once
  27
  28 enum RetFormat {
  29     RF_UNDEF,
  30     RF_BINARY,
  31     RF_HEX,
  32     RF_JSON,
  33 };
  34
  35 static const struct {
  36     enum RetFormat rf;
  37     const char* name;
  38 } rf_names[] = {
  39       {RF_UNDEF, ""},
  40       {RF_BINARY, "bin"},
  41       {RF_HEX, "hex"},
  42       {RF_JSON, "json"},
  43 };
  44
  45 struct CCoin {
  46     uint32_t nTxVer; // Don't call this nVersion, that name has a special meaning inside IMPLEMENT_SERIALIZE
  47     uint32_t nHeight;
  48     CTxOut out;
  49
  50     ADD_SERIALIZE_METHODS;
  51
  52     template <typename Stream, typename Operation>
  53     inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion)
  54     {
  55         READWRITE(nTxVer);
  56         READWRITE(nHeight);
  57         READWRITE(out);
  58     }
  59 };
  60
  61 extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue& entry);
  62 extern UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool txDetails = false);
  63 extern UniValue mempoolInfoToJSON();
  64 extern UniValue mempoolToJSON(bool fVerbose = false);
  65 extern void ScriptPubKeyToJSON(const CScript& scriptPubKey, UniValue& out, bool fIncludeHex);
  66 extern UniValue blockheaderToJSON(const CBlockIndex* blockindex);
  67
  68 static bool RESTERR(HTTPRequest* req, enum HTTPStatusCode status, string message)
  69 {
  70     req->WriteHeader("Content-Type", "text/plain");
  71     req->WriteReply(status, message + "\r\n");
  72     return false;
  73 }
  74
  75 static enum RetFormat ParseDataFormat(std::string& param, const std::string& strReq)
  76 {
  77     const std::string::size_type pos = strReq.rfind('.');
  78     if (pos == std::string::npos)
  79     {
  80         param = strReq;
  81         return rf_names[0].rf;
  82     }
  83
  84     param = strReq.substr(0, pos);
  85     const std::string suff(strReq, pos + 1);
  86
  87     for (unsigned int i = 0; i < ARRAYLEN(rf_names); i++)
  88         if (suff == rf_names[i].name)
  89             return rf_names[i].rf;
  90
  91     /* If no suffix is found, return original string.  */
  92     param = strReq;
  93     return rf_names[0].rf;
  94 }
  95
  96 static string AvailableDataFormatsString()
  97 {
  98     string formats = "";
  99     for (unsigned int i = 0; i < ARRAYLEN(rf_names); i++)
 100         if (strlen(rf_names[i].name) > 0) {
 101             formats.append(".");
 102             formats.append(rf_names[i].name);
 103             formats.append(", ");
 104         }
 105
 106     if (formats.length() > 0)
 107         return formats.substr(0, formats.length() - 2);
 108
 109     return formats;
 110 }
 111
 112 static bool ParseHashStr(const string& strReq, uint256& v)
 113 {
 114     if (!IsHex(strReq) || (strReq.size() != 64))
 115         return false;
 116
 117     v.SetHex(strReq);
 118     return true;
 119 }
 120
 121 static bool CheckWarmup(HTTPRequest* req)
 122 {
 123     std::string statusmessage;
 124     if (RPCIsInWarmup(&statusmessage))
 125          return RESTERR(req, HTTP_SERVICE_UNAVAILABLE, "Service temporarily unavailable: " + statusmessage);
 126     return true;
 127 }
 128
 129 static bool rest_headers(HTTPRequest* req,
 130                          const std::string& strURIPart)
 131 {
 132     if (!CheckWarmup(req))
 133         return false;
 134     std::string param;
 135     const RetFormat rf = ParseDataFormat(param, strURIPart);
 136     vector<string> path;
 137     boost::split(path, param, boost::is_any_of("/"));
 138
 139     if (path.size() != 2)
 140         return RESTERR(req, HTTP_BAD_REQUEST, "No header count specified. Use /rest/headers/<count>/<hash>.<ext>.");
 141
 142     long count = strtol(path[0].c_str(), NULL, 10);
 143     if (count < 1 || count > 2000)
 144         return RESTERR(req, HTTP_BAD_REQUEST, "Header count out of range: " + path[0]);
 145
 146     string hashStr = path[1];
 147     uint256 hash;
 148     if (!ParseHashStr(hashStr, hash))
 149         return RESTERR(req, HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
 150
 151     std::vector<const CBlockIndex *> headers;
 152     headers.reserve(count);
 153     {
 154         LOCK(cs_main);
 155         BlockMap::const_iterator it = mapBlockIndex.find(hash);
 156         const CBlockIndex *pindex = (it != mapBlockIndex.end()) ? it->second : NULL;
 157         while (pindex != NULL && chainActive.Contains(pindex)) {
 158             headers.push_back(pindex);
 159             if (headers.size() == (unsigned long)count)
 160                 break;
 161             pindex = chainActive.Next(pindex);
 162         }
 163     }
 164
 165     CDataStream ssHeader(SER_NETWORK, PROTOCOL_VERSION);
 166     BOOST_FOREACH(const CBlockIndex *pindex, headers) {
 167         ssHeader << pindex->GetBlockHeader();
 168     }
 169
 170     switch (rf) {
 171     case RF_BINARY: {
 172         string binaryHeader = ssHeader.str();
 173         req->WriteHeader("Content-Type", "application/octet-stream");
 174         req->WriteReply(HTTP_OK, binaryHeader);
 175         return true;
 176     }
 177
 178     case RF_HEX: {
 179         string strHex = HexStr(ssHeader.begin(), ssHeader.end()) + "\n";
 180         req->WriteHeader("Content-Type", "text/plain");
 181         req->WriteReply(HTTP_OK, strHex);
 182         return true;
 183     }
 184     case RF_JSON: {
 185         UniValue jsonHeaders(UniValue::VARR);
 186         BOOST_FOREACH(const CBlockIndex *pindex, headers) {
 187             jsonHeaders.push_back(blockheaderToJSON(pindex));
 188         }
 189         string strJSON = jsonHeaders.write() + "\n";
 190         req->WriteHeader("Content-Type", "application/json");
 191         req->WriteReply(HTTP_OK, strJSON);
 192         return true;
 193     }
 194     default: {
 195         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: .bin, .hex)");
 196     }
 197     }
 198
 199     // not reached
 200     return true; // continue to process further HTTP reqs on this cxn
 201 }
 202
 203 static bool rest_block(HTTPRequest* req,
 204                        const std::string& strURIPart,
 205                        bool showTxDetails)
 206 {
 207     if (!CheckWarmup(req))
 208         return false;
 209     std::string hashStr;
 210     const RetFormat rf = ParseDataFormat(hashStr, strURIPart);
 211
 212     uint256 hash;
 213     if (!ParseHashStr(hashStr, hash))
 214         return RESTERR(req, HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
 215
 216     CBlock block;
 217     CBlockIndex* pblockindex = NULL;
 218     {
 219         LOCK(cs_main);
 220         if (mapBlockIndex.count(hash) == 0)
 221             return RESTERR(req, HTTP_NOT_FOUND, hashStr + " not found");
 222
 223         pblockindex = mapBlockIndex[hash];
 224         if (fHavePruned && !(pblockindex->nStatus & BLOCK_HAVE_DATA) && pblockindex->nTx > 0)
 225             return RESTERR(req, HTTP_NOT_FOUND, hashStr + " not available (pruned data)");
 226
 227         if (!ReadBlockFromDisk(block, pblockindex, Params().GetConsensus()))
 228             return RESTERR(req, HTTP_NOT_FOUND, hashStr + " not found");
 229     }
 230
 231     CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
 232     ssBlock << block;
 233
 234     switch (rf) {
 235     case RF_BINARY: {
 236         string binaryBlock = ssBlock.str();
 237         req->WriteHeader("Content-Type", "application/octet-stream");
 238         req->WriteReply(HTTP_OK, binaryBlock);
 239         return true;
 240     }
 241
 242     case RF_HEX: {
 243         string strHex = HexStr(ssBlock.begin(), ssBlock.end()) + "\n";
 244         req->WriteHeader("Content-Type", "text/plain");
 245         req->WriteReply(HTTP_OK, strHex);
 246         return true;
 247     }
 248
 249     case RF_JSON: {
 250         UniValue objBlock = blockToJSON(block, pblockindex, showTxDetails);
 251         string strJSON = objBlock.write() + "\n";
 252         req->WriteHeader("Content-Type", "application/json");
 253         req->WriteReply(HTTP_OK, strJSON);
 254         return true;
 255     }
 256
 257     default: {
 258         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: " + AvailableDataFormatsString() + ")");
 259     }
 260     }
 261
 262     // not reached
 263     return true; // continue to process further HTTP reqs on this cxn
 264 }
 265
 266 static bool rest_block_extended(HTTPRequest* req, const std::string& strURIPart)
 267 {
 268     return rest_block(req, strURIPart, true);
 269 }
 270
 271 static bool rest_block_notxdetails(HTTPRequest* req, const std::string& strURIPart)
 272 {
 273     return rest_block(req, strURIPart, false);
 274 }
 275
 276 // A bit of a hack - dependency on a function defined in rpc/blockchain.cpp
 277 UniValue getblockchaininfo(const UniValue& params, bool fHelp);
 278
 279 static bool rest_chaininfo(HTTPRequest* req, const std::string& strURIPart)
 280 {
 281     if (!CheckWarmup(req))
 282         return false;
 283     std::string param;
 284     const RetFormat rf = ParseDataFormat(param, strURIPart);
 285
 286     switch (rf) {
 287     case RF_JSON: {
 288         UniValue rpcParams(UniValue::VARR);
 289         UniValue chainInfoObject = getblockchaininfo(rpcParams, false);
 290         string strJSON = chainInfoObject.write() + "\n";
 291         req->WriteHeader("Content-Type", "application/json");
 292         req->WriteReply(HTTP_OK, strJSON);
 293         return true;
 294     }
 295     default: {
 296         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: json)");
 297     }
 298     }
 299
 300     // not reached
 301     return true; // continue to process further HTTP reqs on this cxn
 302 }
 303
 304 static bool rest_mempool_info(HTTPRequest* req, const std::string& strURIPart)
 305 {
 306     if (!CheckWarmup(req))
 307         return false;
 308     std::string param;
 309     const RetFormat rf = ParseDataFormat(param, strURIPart);
 310
 311     switch (rf) {
 312     case RF_JSON: {
 313         UniValue mempoolInfoObject = mempoolInfoToJSON();
 314
 315         string strJSON = mempoolInfoObject.write() + "\n";
 316         req->WriteHeader("Content-Type", "application/json");
 317         req->WriteReply(HTTP_OK, strJSON);
 318         return true;
 319     }
 320     default: {
 321         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: json)");
 322     }
 323     }
 324
 325     // not reached
 326     return true; // continue to process further HTTP reqs on this cxn
 327 }
 328
 329 static bool rest_mempool_contents(HTTPRequest* req, const std::string& strURIPart)
 330 {
 331     if (!CheckWarmup(req))
 332         return false;
 333     std::string param;
 334     const RetFormat rf = ParseDataFormat(param, strURIPart);
 335
 336     switch (rf) {
 337     case RF_JSON: {
 338         UniValue mempoolObject = mempoolToJSON(true);
 339
 340         string strJSON = mempoolObject.write() + "\n";
 341         req->WriteHeader("Content-Type", "application/json");
 342         req->WriteReply(HTTP_OK, strJSON);
 343         return true;
 344     }
 345     default: {
 346         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: json)");
 347     }
 348     }
 349
 350     // not reached
 351     return true; // continue to process further HTTP reqs on this cxn
 352 }
 353
 354 static bool rest_tx(HTTPRequest* req, const std::string& strURIPart)
 355 {
 356     if (!CheckWarmup(req))
 357         return false;
 358     std::string hashStr;
 359     const RetFormat rf = ParseDataFormat(hashStr, strURIPart);
 360
 361     uint256 hash;
 362     if (!ParseHashStr(hashStr, hash))
 363         return RESTERR(req, HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
 364
 365     CTransaction tx;
 366     uint256 hashBlock = uint256();
 367     if (!GetTransaction(hash, tx, Params().GetConsensus(), hashBlock, true))
 368         return RESTERR(req, HTTP_NOT_FOUND, hashStr + " not found");
 369
 370     CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
 371     ssTx << tx;
 372
 373     switch (rf) {
 374     case RF_BINARY: {
 375         string binaryTx = ssTx.str();
 376         req->WriteHeader("Content-Type", "application/octet-stream");
 377         req->WriteReply(HTTP_OK, binaryTx);
 378         return true;
 379     }
 380
 381     case RF_HEX: {
 382         string strHex = HexStr(ssTx.begin(), ssTx.end()) + "\n";
 383         req->WriteHeader("Content-Type", "text/plain");
 384         req->WriteReply(HTTP_OK, strHex);
 385         return true;
 386     }
 387
 388     case RF_JSON: {
 389         UniValue objTx(UniValue::VOBJ);
 390         TxToJSON(tx, hashBlock, objTx);
 391         string strJSON = objTx.write() + "\n";
 392         req->WriteHeader("Content-Type", "application/json");
 393         req->WriteReply(HTTP_OK, strJSON);
 394         return true;
 395     }
 396
 397     default: {
 398         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: " + AvailableDataFormatsString() + ")");
 399     }
 400     }
 401
 402     // not reached
 403     return true; // continue to process further HTTP reqs on this cxn
 404 }
 405
 406 static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
 407 {
 408     if (!CheckWarmup(req))
 409         return false;
 410     std::string param;
 411     const RetFormat rf = ParseDataFormat(param, strURIPart);
 412
 413     vector<string> uriParts;
 414     if (param.length() > 1)
 415     {
 416         std::string strUriParams = param.substr(1);
 417         boost::split(uriParts, strUriParams, boost::is_any_of("/"));
 418     }
 419
 420     // throw exception in case of a empty request
 421     std::string strRequestMutable = req->ReadBody();
 422     if (strRequestMutable.length() == 0 && uriParts.size() == 0)
 423         return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Error: empty request");
 424
 425     bool fInputParsed = false;
 426     bool fCheckMemPool = false;
 427     vector<COutPoint> vOutPoints;
 428
 429     // parse/deserialize input
 430     // input-format = output-format, rest/getutxos/bin requires binary input, gives binary output, ...
 431
 432     if (uriParts.size() > 0)
 433     {
 434
 435         //inputs is sent over URI scheme (/rest/getutxos/checkmempool/txid1-n/txid2-n/...)
 436         if (uriParts.size() > 0 && uriParts[0] == "checkmempool")
 437             fCheckMemPool = true;
 438
 439         for (size_t i = (fCheckMemPool) ? 1 : 0; i < uriParts.size(); i++)
 440         {
 441             uint256 txid;
 442             int32_t nOutput;
 443             std::string strTxid = uriParts[i].substr(0, uriParts[i].find("-"));
 444             std::string strOutput = uriParts[i].substr(uriParts[i].find("-")+1);
 445
 446             if (!ParseInt32(strOutput, &nOutput) || !IsHex(strTxid))
 447                 return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Parse error");
 448
 449             txid.SetHex(strTxid);
 450             vOutPoints.push_back(COutPoint(txid, (uint32_t)nOutput));
 451         }
 452
 453         if (vOutPoints.size() > 0)
 454             fInputParsed = true;
 455         else
 456             return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Error: empty request");
 457     }
 458
 459     switch (rf) {
 460     case RF_HEX: {
 461         // convert hex to bin, continue then with bin part
 462         std::vector<unsigned char> strRequestV = ParseHex(strRequestMutable);
 463         strRequestMutable.assign(strRequestV.begin(), strRequestV.end());
 464     }
 465
 466     case RF_BINARY: {
 467         try {
 468             //deserialize only if user sent a request
 469             if (strRequestMutable.size() > 0)
 470             {
 471                 if (fInputParsed) //don't allow sending input over URI and HTTP RAW DATA
 472                     return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Combination of URI scheme inputs and raw post data is not allowed");
 473
 474                 CDataStream oss(SER_NETWORK, PROTOCOL_VERSION);
 475                 oss << strRequestMutable;
 476                 oss >> fCheckMemPool;
 477                 oss >> vOutPoints;
 478             }
 479         } catch (const std::ios_base::failure& e) {
 480             // abort in case of unreadable binary data
 481             return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Parse error");
 482         }
 483         break;
 484     }
 485
 486     case RF_JSON: {
 487         if (!fInputParsed)
 488             return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Error: empty request");
 489         break;
 490     }
 491     default: {
 492         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: " + AvailableDataFormatsString() + ")");
 493     }
 494     }
 495
 496     // limit max outpoints
 497     if (vOutPoints.size() > MAX_GETUTXOS_OUTPOINTS)
 498         return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, strprintf("Error: max outpoints exceeded (max: %d, tried: %d)", MAX_GETUTXOS_OUTPOINTS, vOutPoints.size()));
 499
 500     // check spentness and form a bitmap (as well as a JSON capable human-readable string representation)
 501     vector<unsigned char> bitmap;
 502     vector<CCoin> outs;
 503     std::string bitmapStringRepresentation;
 504     boost::dynamic_bitset<unsigned char> hits(vOutPoints.size());
 505     {
 506         LOCK2(cs_main, mempool.cs);
 507
 508         CCoinsView viewDummy;
 509         CCoinsViewCache view(&viewDummy);
 510
 511         CCoinsViewCache& viewChain = *pcoinsTip;
 512         CCoinsViewMemPool viewMempool(&viewChain, mempool);
 513
 514         if (fCheckMemPool)
 515             view.SetBackend(viewMempool); // switch cache backend to db+mempool in case user likes to query mempool
 516
 517         for (size_t i = 0; i < vOutPoints.size(); i++) {
 518             CCoins coins;
 519             uint256 hash = vOutPoints[i].hash;
 520             if (view.GetCoins(hash, coins)) {
 521                 mempool.pruneSpent(hash, coins);
 522                 if (coins.IsAvailable(vOutPoints[i].n)) {
 523                     hits[i] = true;
 524                     // Safe to index into vout here because IsAvailable checked if it's off the end of the array, or if
 525                     // n is valid but points to an already spent output (IsNull).
 526                     CCoin coin;
 527                     coin.nTxVer = coins.nVersion;
 528                     coin.nHeight = coins.nHeight;
 529                     coin.out = coins.vout.at(vOutPoints[i].n);
 530                     assert(!coin.out.IsNull());
 531                     outs.push_back(coin);
 532                 }
 533             }
 534
 535             bitmapStringRepresentation.append(hits[i] ? "1" : "0"); // form a binary string representation (human-readable for json output)
 536         }
 537     }
 538     boost::to_block_range(hits, std::back_inserter(bitmap));
 539
 540     switch (rf) {
 541     case RF_BINARY: {
 542         // serialize data
 543         // use exact same output as mentioned in Bip64
 544         CDataStream ssGetUTXOResponse(SER_NETWORK, PROTOCOL_VERSION);
 545         ssGetUTXOResponse << chainActive.Height() << chainActive.Tip()->GetBlockHash() << bitmap << outs;
 546         string ssGetUTXOResponseString = ssGetUTXOResponse.str();
 547
 548         req->WriteHeader("Content-Type", "application/octet-stream");
 549         req->WriteReply(HTTP_OK, ssGetUTXOResponseString);
 550         return true;
 551     }
 552
 553     case RF_HEX: {
 554         CDataStream ssGetUTXOResponse(SER_NETWORK, PROTOCOL_VERSION);
 555         ssGetUTXOResponse << chainActive.Height() << chainActive.Tip()->GetBlockHash() << bitmap << outs;
 556         string strHex = HexStr(ssGetUTXOResponse.begin(), ssGetUTXOResponse.end()) + "\n";
 557
 558         req->WriteHeader("Content-Type", "text/plain");
 559         req->WriteReply(HTTP_OK, strHex);
 560         return true;
 561     }
 562
 563     case RF_JSON: {
 564         UniValue objGetUTXOResponse(UniValue::VOBJ);
 565
 566         // pack in some essentials
 567         // use more or less the same output as mentioned in Bip64
 568         objGetUTXOResponse.push_back(Pair("chainHeight", chainActive.Height()));
 569         objGetUTXOResponse.push_back(Pair("chaintipHash", chainActive.Tip()->GetBlockHash().GetHex()));
 570         objGetUTXOResponse.push_back(Pair("bitmap", bitmapStringRepresentation));
 571
 572         UniValue utxos(UniValue::VARR);
 573         BOOST_FOREACH (const CCoin& coin, outs) {
 574             UniValue utxo(UniValue::VOBJ);
 575             utxo.push_back(Pair("txvers", (int32_t)coin.nTxVer));
 576             utxo.push_back(Pair("height", (int32_t)coin.nHeight));
 577             utxo.push_back(Pair("value", ValueFromAmount(coin.out.nValue)));
 578
 579             // include the script in a json output
 580             UniValue o(UniValue::VOBJ);
 581             ScriptPubKeyToJSON(coin.out.scriptPubKey, o, true);
 582             utxo.push_back(Pair("scriptPubKey", o));
 583             utxos.push_back(utxo);
 584         }
 585         objGetUTXOResponse.push_back(Pair("utxos", utxos));
 586
 587         // return json string
 588         string strJSON = objGetUTXOResponse.write() + "\n";
 589         req->WriteHeader("Content-Type", "application/json");
 590         req->WriteReply(HTTP_OK, strJSON);
 591         return true;
 592     }
 593     default: {
 594         return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: " + AvailableDataFormatsString() + ")");
 595     }
 596     }
 597
 598     // not reached
 599     return true; // continue to process further HTTP reqs on this cxn
 600 }
 601
 602 static const struct {
 603     const char* prefix;
 604     bool (*handler)(HTTPRequest* req, const std::string& strReq);
 605 } uri_prefixes[] = {
 606       {"/rest/tx/", rest_tx},
 607       {"/rest/block/notxdetails/", rest_block_notxdetails},
 608       {"/rest/block/", rest_block_extended},
 609       {"/rest/chaininfo", rest_chaininfo},
 610       {"/rest/mempool/info", rest_mempool_info},
 611       {"/rest/mempool/contents", rest_mempool_contents},
 612       {"/rest/headers/", rest_headers},
 613       {"/rest/getutxos", rest_getutxos},
 614 };
 615
 616 bool StartREST()
 617 {
 618     for (unsigned int i = 0; i < ARRAYLEN(uri_prefixes); i++)
 619         RegisterHTTPHandler(uri_prefixes[i].prefix, false, uri_prefixes[i].handler);
 620     return true;
 621 }
 622
 623 void InterruptREST()
 624 {
 625 }
 626
 627 void StopREST()
 628 {
 629     for (unsigned int i = 0; i < ARRAYLEN(uri_prefixes); i++)
 630         UnregisterHTTPHandler(uri_prefixes[i].prefix, false);
 631 }