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main.h 22KB

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  1. // Copyright (c) 2009-2010 Satoshi Nakamoto
  2. // Copyright (c) 2009-2014 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. #ifndef BITCOIN_MAIN_H
  6. #define BITCOIN_MAIN_H
  7. #if defined(HAVE_CONFIG_H)
  8. #include "config/bitcoin-config.h"
  9. #endif
  10. #include "amount.h"
  11. #include "chain.h"
  12. #include "coins.h"
  13. #include "net.h"
  14. #include "script/script_error.h"
  15. #include "sync.h"
  16. #include <algorithm>
  17. #include <exception>
  18. #include <map>
  19. #include <set>
  20. #include <stdint.h>
  21. #include <string>
  22. #include <utility>
  23. #include <vector>
  24. #include <boost/unordered_map.hpp>
  25. class CBlockIndex;
  26. class CBlockTreeDB;
  27. class CBloomFilter;
  28. class CChainParams;
  29. class CInv;
  30. class CScriptCheck;
  31. class CTxMemPool;
  32. class CValidationInterface;
  33. class CValidationState;
  34. struct CNodeStateStats;
  35. /** Default for accepting alerts from the P2P network. */
  36. static const bool DEFAULT_ALERTS = true;
  37. /** Default for DEFAULT_WHITELISTALWAYSRELAY. */
  38. static const bool DEFAULT_WHITELISTALWAYSRELAY = true;
  39. /** Default for -minrelaytxfee, minimum relay fee for transactions */
  40. static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 1000;
  41. /** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
  42. static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
  43. /** Default for -limitancestorcount, max number of in-mempool ancestors */
  44. static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
  45. /** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool ancestors */
  46. static const unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT = 101;
  47. /** Default for -limitdescendantcount, max number of in-mempool descendants */
  48. static const unsigned int DEFAULT_DESCENDANT_LIMIT = 25;
  49. /** Default for -limitdescendantsize, maximum kilobytes of in-mempool descendants */
  50. static const unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT = 101;
  51. /** Default for -mempoolexpiry, expiration time for mempool transactions in hours */
  52. static const unsigned int DEFAULT_MEMPOOL_EXPIRY = 72;
  53. /** The maximum size of a blk?????.dat file (since 0.8) */
  54. static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
  55. /** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
  56. static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
  57. /** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
  58. static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
  59. /** Maximum number of script-checking threads allowed */
  60. static const int MAX_SCRIPTCHECK_THREADS = 16;
  61. /** -par default (number of script-checking threads, 0 = auto) */
  62. static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
  63. /** Number of blocks that can be requested at any given time from a single peer. */
  64. static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16;
  65. /** Timeout in seconds during which a peer must stall block download progress before being disconnected. */
  66. static const unsigned int BLOCK_STALLING_TIMEOUT = 2;
  67. /** Number of headers sent in one getheaders result. We rely on the assumption that if a peer sends
  68. * less than this number, we reached its tip. Changing this value is a protocol upgrade. */
  69. static const unsigned int MAX_HEADERS_RESULTS = 2000;
  70. /** Size of the "block download window": how far ahead of our current height do we fetch?
  71. * Larger windows tolerate larger download speed differences between peer, but increase the potential
  72. * degree of disordering of blocks on disk (which make reindexing and in the future perhaps pruning
  73. * harder). We'll probably want to make this a per-peer adaptive value at some point. */
  74. static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024;
  75. /** Time to wait (in seconds) between writing blocks/block index to disk. */
  76. static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
  77. /** Time to wait (in seconds) between flushing chainstate to disk. */
  78. static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
  79. /** Maximum length of reject messages. */
  80. static const unsigned int MAX_REJECT_MESSAGE_LENGTH = 111;
  81. static const unsigned int DEFAULT_LIMITFREERELAY = 15;
  82. static const bool DEFAULT_RELAYPRIORITY = true;
  83. /** Default for -permitbaremultisig */
  84. static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
  85. static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
  86. static const bool DEFAULT_TXINDEX = false;
  87. static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
  88. static const bool DEFAULT_TESTSAFEMODE = false;
  89. /** Maximum number of headers to announce when relaying blocks with headers message.*/
  90. static const unsigned int MAX_BLOCKS_TO_ANNOUNCE = 8;
  91. struct BlockHasher
  92. {
  93. size_t operator()(const uint256& hash) const { return hash.GetCheapHash(); }
  94. };
  95. extern CScript COINBASE_FLAGS;
  96. extern CCriticalSection cs_main;
  97. extern CTxMemPool mempool;
  98. typedef boost::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
  99. extern BlockMap mapBlockIndex;
  100. extern uint64_t nLastBlockTx;
  101. extern uint64_t nLastBlockSize;
  102. extern const std::string strMessageMagic;
  103. extern CWaitableCriticalSection csBestBlock;
  104. extern CConditionVariable cvBlockChange;
  105. extern bool fImporting;
  106. extern bool fReindex;
  107. extern int nScriptCheckThreads;
  108. extern bool fTxIndex;
  109. extern bool fIsBareMultisigStd;
  110. extern bool fRequireStandard;
  111. extern bool fCheckBlockIndex;
  112. extern bool fCheckpointsEnabled;
  113. extern size_t nCoinCacheUsage;
  114. extern CFeeRate minRelayTxFee;
  115. extern bool fAlerts;
  116. /** Best header we've seen so far (used for getheaders queries' starting points). */
  117. extern CBlockIndex *pindexBestHeader;
  118. /** Minimum disk space required - used in CheckDiskSpace() */
  119. static const uint64_t nMinDiskSpace = 52428800;
  120. /** Pruning-related variables and constants */
  121. /** True if any block files have ever been pruned. */
  122. extern bool fHavePruned;
  123. /** True if we're running in -prune mode. */
  124. extern bool fPruneMode;
  125. /** Number of MiB of block files that we're trying to stay below. */
  126. extern uint64_t nPruneTarget;
  127. /** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of chainActive.Tip() will not be pruned. */
  128. static const unsigned int MIN_BLOCKS_TO_KEEP = 288;
  129. static const signed int DEFAULT_CHECKBLOCKS = MIN_BLOCKS_TO_KEEP;
  130. static const unsigned int DEFAULT_CHECKLEVEL = 3;
  131. // Require that user allocate at least 550MB for block & undo files (blk???.dat and rev???.dat)
  132. // At 1MB per block, 288 blocks = 288MB.
  133. // Add 15% for Undo data = 331MB
  134. // Add 20% for Orphan block rate = 397MB
  135. // We want the low water mark after pruning to be at least 397 MB and since we prune in
  136. // full block file chunks, we need the high water mark which triggers the prune to be
  137. // one 128MB block file + added 15% undo data = 147MB greater for a total of 545MB
  138. // Setting the target to > than 550MB will make it likely we can respect the target.
  139. static const uint64_t MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024;
  140. /** Register with a network node to receive its signals */
  141. void RegisterNodeSignals(CNodeSignals& nodeSignals);
  142. /** Unregister a network node */
  143. void UnregisterNodeSignals(CNodeSignals& nodeSignals);
  144. /**
  145. * Process an incoming block. This only returns after the best known valid
  146. * block is made active. Note that it does not, however, guarantee that the
  147. * specific block passed to it has been checked for validity!
  148. *
  149. * @param[out] state This may be set to an Error state if any error occurred processing it, including during validation/connection/etc of otherwise unrelated blocks during reorganisation; or it may be set to an Invalid state if pblock is itself invalid (but this is not guaranteed even when the block is checked). If you want to *possibly* get feedback on whether pblock is valid, you must also install a CValidationInterface (see validationinterface.h) - this will have its BlockChecked method called whenever *any* block completes validation.
  150. * @param[in] pfrom The node which we are receiving the block from; it is added to mapBlockSource and may be penalised if the block is invalid.
  151. * @param[in] pblock The block we want to process.
  152. * @param[in] fForceProcessing Process this block even if unrequested; used for non-network block sources and whitelisted peers.
  153. * @param[out] dbp If pblock is stored to disk (or already there), this will be set to its location.
  154. * @return True if state.IsValid()
  155. */
  156. bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, const CNode* pfrom, const CBlock* pblock, bool fForceProcessing, CDiskBlockPos* dbp);
  157. /** Check whether enough disk space is available for an incoming block */
  158. bool CheckDiskSpace(uint64_t nAdditionalBytes = 0);
  159. /** Open a block file (blk?????.dat) */
  160. FILE* OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly = false);
  161. /** Open an undo file (rev?????.dat) */
  162. FILE* OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly = false);
  163. /** Translation to a filesystem path */
  164. boost::filesystem::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix);
  165. /** Import blocks from an external file */
  166. bool LoadExternalBlockFile(const CChainParams& chainparams, FILE* fileIn, CDiskBlockPos *dbp = NULL);
  167. /** Initialize a new block tree database + block data on disk */
  168. bool InitBlockIndex(const CChainParams& chainparams);
  169. /** Load the block tree and coins database from disk */
  170. bool LoadBlockIndex();
  171. /** Unload database information */
  172. void UnloadBlockIndex();
  173. /** Process protocol messages received from a given node */
  174. bool ProcessMessages(CNode* pfrom);
  175. /**
  176. * Send queued protocol messages to be sent to a give node.
  177. *
  178. * @param[in] pto The node which we are sending messages to.
  179. * @param[in] fSendTrickle When true send the trickled data, otherwise trickle the data until true.
  180. */
  181. bool SendMessages(CNode* pto, bool fSendTrickle);
  182. /** Run an instance of the script checking thread */
  183. void ThreadScriptCheck();
  184. /** Try to detect Partition (network isolation) attacks against us */
  185. void PartitionCheck(bool (*initialDownloadCheck)(), CCriticalSection& cs, const CBlockIndex *const &bestHeader, int64_t nPowTargetSpacing);
  186. /** Check whether we are doing an initial block download (synchronizing from disk or network) */
  187. bool IsInitialBlockDownload();
  188. /** Format a string that describes several potential problems detected by the core.
  189. * strFor can have three values:
  190. * - "rpc": get critical warnings, which should put the client in safe mode if non-empty
  191. * - "statusbar": get all warnings
  192. * - "gui": get all warnings, translated (where possible) for GUI
  193. * This function only returns the highest priority warning of the set selected by strFor.
  194. */
  195. std::string GetWarnings(const std::string& strFor);
  196. /** Retrieve a transaction (from memory pool, or from disk, if possible) */
  197. bool GetTransaction(const uint256 &hash, CTransaction &tx, const Consensus::Params& params, uint256 &hashBlock, bool fAllowSlow = false);
  198. /** Find the best known block, and make it the tip of the block chain */
  199. bool ActivateBestChain(CValidationState& state, const CChainParams& chainparams, const CBlock* pblock = NULL);
  200. CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams);
  201. /**
  202. * Prune block and undo files (blk???.dat and undo???.dat) so that the disk space used is less than a user-defined target.
  203. * The user sets the target (in MB) on the command line or in config file. This will be run on startup and whenever new
  204. * space is allocated in a block or undo file, staying below the target. Changing back to unpruned requires a reindex
  205. * (which in this case means the blockchain must be re-downloaded.)
  206. *
  207. * Pruning functions are called from FlushStateToDisk when the global fCheckForPruning flag has been set.
  208. * Block and undo files are deleted in lock-step (when blk00003.dat is deleted, so is rev00003.dat.)
  209. * Pruning cannot take place until the longest chain is at least a certain length (100000 on mainnet, 1000 on testnet, 1000 on regtest).
  210. * Pruning will never delete a block within a defined distance (currently 288) from the active chain's tip.
  211. * The block index is updated by unsetting HAVE_DATA and HAVE_UNDO for any blocks that were stored in the deleted files.
  212. * A db flag records the fact that at least some block files have been pruned.
  213. *
  214. * @param[out] setFilesToPrune The set of file indices that can be unlinked will be returned
  215. */
  216. void FindFilesToPrune(std::set<int>& setFilesToPrune, uint64_t nPruneAfterHeight);
  217. /**
  218. * Actually unlink the specified files
  219. */
  220. void UnlinkPrunedFiles(std::set<int>& setFilesToPrune);
  221. /** Create a new block index entry for a given block hash */
  222. CBlockIndex * InsertBlockIndex(uint256 hash);
  223. /** Get statistics from node state */
  224. bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
  225. /** Increase a node's misbehavior score. */
  226. void Misbehaving(NodeId nodeid, int howmuch);
  227. /** Flush all state, indexes and buffers to disk. */
  228. void FlushStateToDisk();
  229. /** Prune block files and flush state to disk. */
  230. void PruneAndFlush();
  231. /** (try to) add transaction to memory pool **/
  232. bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransaction &tx, bool fLimitFree,
  233. bool* pfMissingInputs, bool fOverrideMempoolLimit=false, bool fRejectAbsurdFee=false);
  234. /** Convert CValidationState to a human-readable message for logging */
  235. std::string FormatStateMessage(const CValidationState &state);
  236. struct CNodeStateStats {
  237. int nMisbehavior;
  238. int nSyncHeight;
  239. int nCommonHeight;
  240. std::vector<int> vHeightInFlight;
  241. };
  242. struct CDiskTxPos : public CDiskBlockPos
  243. {
  244. unsigned int nTxOffset; // after header
  245. ADD_SERIALIZE_METHODS;
  246. template <typename Stream, typename Operation>
  247. inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
  248. READWRITE(*(CDiskBlockPos*)this);
  249. READWRITE(VARINT(nTxOffset));
  250. }
  251. CDiskTxPos(const CDiskBlockPos &blockIn, unsigned int nTxOffsetIn) : CDiskBlockPos(blockIn.nFile, blockIn.nPos), nTxOffset(nTxOffsetIn) {
  252. }
  253. CDiskTxPos() {
  254. SetNull();
  255. }
  256. void SetNull() {
  257. CDiskBlockPos::SetNull();
  258. nTxOffset = 0;
  259. }
  260. };
  261. CAmount GetMinRelayFee(const CTransaction& tx, unsigned int nBytes, bool fAllowFree);
  262. /**
  263. * Count ECDSA signature operations the old-fashioned (pre-0.6) way
  264. * @return number of sigops this transaction's outputs will produce when spent
  265. * @see CTransaction::FetchInputs
  266. */
  267. unsigned int GetLegacySigOpCount(const CTransaction& tx);
  268. /**
  269. * Count ECDSA signature operations in pay-to-script-hash inputs.
  270. *
  271. * @param[in] mapInputs Map of previous transactions that have outputs we're spending
  272. * @return maximum number of sigops required to validate this transaction's inputs
  273. * @see CTransaction::FetchInputs
  274. */
  275. unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& mapInputs);
  276. /**
  277. * Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts)
  278. * This does not modify the UTXO set. If pvChecks is not NULL, script checks are pushed onto it
  279. * instead of being performed inline.
  280. */
  281. bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsViewCache &view, bool fScriptChecks,
  282. unsigned int flags, bool cacheStore, std::vector<CScriptCheck> *pvChecks = NULL);
  283. /** Apply the effects of this transaction on the UTXO set represented by view */
  284. void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, int nHeight);
  285. /** Context-independent validity checks */
  286. bool CheckTransaction(const CTransaction& tx, CValidationState& state);
  287. /**
  288. * Check if transaction is final and can be included in a block with the
  289. * specified height and time. Consensus critical.
  290. */
  291. bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime);
  292. /**
  293. * Check if transaction will be final in the next block to be created.
  294. *
  295. * Calls IsFinalTx() with current block height and appropriate block time.
  296. *
  297. * See consensus/consensus.h for flag definitions.
  298. */
  299. bool CheckFinalTx(const CTransaction &tx, int flags = -1);
  300. /**
  301. * Closure representing one script verification
  302. * Note that this stores references to the spending transaction
  303. */
  304. class CScriptCheck
  305. {
  306. private:
  307. CScript scriptPubKey;
  308. const CTransaction *ptxTo;
  309. unsigned int nIn;
  310. unsigned int nFlags;
  311. bool cacheStore;
  312. ScriptError error;
  313. public:
  314. CScriptCheck(): ptxTo(0), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR) {}
  315. CScriptCheck(const CCoins& txFromIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn) :
  316. scriptPubKey(txFromIn.vout[txToIn.vin[nInIn].prevout.n].scriptPubKey),
  317. ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR) { }
  318. bool operator()();
  319. void swap(CScriptCheck &check) {
  320. scriptPubKey.swap(check.scriptPubKey);
  321. std::swap(ptxTo, check.ptxTo);
  322. std::swap(nIn, check.nIn);
  323. std::swap(nFlags, check.nFlags);
  324. std::swap(cacheStore, check.cacheStore);
  325. std::swap(error, check.error);
  326. }
  327. ScriptError GetScriptError() const { return error; }
  328. };
  329. /** Functions for disk access for blocks */
  330. bool WriteBlockToDisk(const CBlock& block, CDiskBlockPos& pos, const CMessageHeader::MessageStartChars& messageStart);
  331. bool ReadBlockFromDisk(CBlock& block, const CDiskBlockPos& pos, const Consensus::Params& consensusParams);
  332. bool ReadBlockFromDisk(CBlock& block, const CBlockIndex* pindex, const Consensus::Params& consensusParams);
  333. /** Functions for validating blocks and updating the block tree */
  334. /** Undo the effects of this block (with given index) on the UTXO set represented by coins.
  335. * In case pfClean is provided, operation will try to be tolerant about errors, and *pfClean
  336. * will be true if no problems were found. Otherwise, the return value will be false in case
  337. * of problems. Note that in any case, coins may be modified. */
  338. bool DisconnectBlock(const CBlock& block, CValidationState& state, const CBlockIndex* pindex, CCoinsViewCache& coins, bool* pfClean = NULL);
  339. /** Apply the effects of this block (with given index) on the UTXO set represented by coins */
  340. bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pindex, CCoinsViewCache& coins, bool fJustCheck = false);
  341. /** Context-independent validity checks */
  342. bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool fCheckPOW = true);
  343. bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW = true, bool fCheckMerkleRoot = true);
  344. /** Context-dependent validity checks */
  345. bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, CBlockIndex *pindexPrev);
  346. bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIndex *pindexPrev);
  347. /** Check a block is completely valid from start to finish (only works on top of our current best block, with cs_main held) */
  348. bool TestBlockValidity(CValidationState& state, const CChainParams& chainparams, const CBlock& block, CBlockIndex* pindexPrev, bool fCheckPOW = true, bool fCheckMerkleRoot = true);
  349. class CBlockFileInfo
  350. {
  351. public:
  352. unsigned int nBlocks; //! number of blocks stored in file
  353. unsigned int nSize; //! number of used bytes of block file
  354. unsigned int nUndoSize; //! number of used bytes in the undo file
  355. unsigned int nHeightFirst; //! lowest height of block in file
  356. unsigned int nHeightLast; //! highest height of block in file
  357. uint64_t nTimeFirst; //! earliest time of block in file
  358. uint64_t nTimeLast; //! latest time of block in file
  359. ADD_SERIALIZE_METHODS;
  360. template <typename Stream, typename Operation>
  361. inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
  362. READWRITE(VARINT(nBlocks));
  363. READWRITE(VARINT(nSize));
  364. READWRITE(VARINT(nUndoSize));
  365. READWRITE(VARINT(nHeightFirst));
  366. READWRITE(VARINT(nHeightLast));
  367. READWRITE(VARINT(nTimeFirst));
  368. READWRITE(VARINT(nTimeLast));
  369. }
  370. void SetNull() {
  371. nBlocks = 0;
  372. nSize = 0;
  373. nUndoSize = 0;
  374. nHeightFirst = 0;
  375. nHeightLast = 0;
  376. nTimeFirst = 0;
  377. nTimeLast = 0;
  378. }
  379. CBlockFileInfo() {
  380. SetNull();
  381. }
  382. std::string ToString() const;
  383. /** update statistics (does not update nSize) */
  384. void AddBlock(unsigned int nHeightIn, uint64_t nTimeIn) {
  385. if (nBlocks==0 || nHeightFirst > nHeightIn)
  386. nHeightFirst = nHeightIn;
  387. if (nBlocks==0 || nTimeFirst > nTimeIn)
  388. nTimeFirst = nTimeIn;
  389. nBlocks++;
  390. if (nHeightIn > nHeightLast)
  391. nHeightLast = nHeightIn;
  392. if (nTimeIn > nTimeLast)
  393. nTimeLast = nTimeIn;
  394. }
  395. };
  396. /** RAII wrapper for VerifyDB: Verify consistency of the block and coin databases */
  397. class CVerifyDB {
  398. public:
  399. CVerifyDB();
  400. ~CVerifyDB();
  401. bool VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview, int nCheckLevel, int nCheckDepth);
  402. };
  403. /** Find the last common block between the parameter chain and a locator. */
  404. CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& locator);
  405. /** Mark a block as invalid. */
  406. bool InvalidateBlock(CValidationState& state, const Consensus::Params& consensusParams, CBlockIndex *pindex);
  407. /** Remove invalidity status from a block and its descendants. */
  408. bool ReconsiderBlock(CValidationState& state, CBlockIndex *pindex);
  409. /** The currently-connected chain of blocks (protected by cs_main). */
  410. extern CChain chainActive;
  411. /** Global variable that points to the active CCoinsView (protected by cs_main) */
  412. extern CCoinsViewCache *pcoinsTip;
  413. /** Global variable that points to the active block tree (protected by cs_main) */
  414. extern CBlockTreeDB *pblocktree;
  415. /**
  416. * Return the spend height, which is one more than the inputs.GetBestBlock().
  417. * While checking, GetBestBlock() refers to the parent block. (protected by cs_main)
  418. * This is also true for mempool checks.
  419. */
  420. int GetSpendHeight(const CCoinsViewCache& inputs);
  421. /** Reject codes greater or equal to this can be returned by AcceptToMemPool
  422. * for transactions, to signal internal conditions. They cannot and should not
  423. * be sent over the P2P network.
  424. */
  425. static const unsigned int REJECT_INTERNAL = 0x100;
  426. /** Too high fee. Can not be triggered by P2P transactions */
  427. static const unsigned int REJECT_HIGHFEE = 0x100;
  428. /** Transaction is already known (either in mempool or blockchain) */
  429. static const unsigned int REJECT_ALREADY_KNOWN = 0x101;
  430. /** Transaction conflicts with a transaction already known */
  431. static const unsigned int REJECT_CONFLICT = 0x102;
  432. #endif // BITCOIN_MAIN_H