Consensus: Refactor: Decouple pow.o from chainparams.o

src/main.cpp

@@ -1158,7 +1158,7 @@ bool ReadBlockFromDisk(CBlock& block, const CDiskBlockPos& pos)
     }
 
     // Check the header
-    if (!CheckProofOfWork(block.GetHash(), block.nBits))
+    if (!CheckProofOfWork(block.GetHash(), block.nBits, Params().GetConsensus()))
         return error("ReadBlockFromDisk: Errors in block header at %s", pos.ToString());
 
     return true;
@@ -2462,7 +2462,7 @@ bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos, unsigne
 bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool fCheckPOW)
 {
     // Check proof of work matches claimed amount
-    if (fCheckPOW && !CheckProofOfWork(block.GetHash(), block.nBits))
+    if (fCheckPOW && !CheckProofOfWork(block.GetHash(), block.nBits, Params().GetConsensus()))
         return state.DoS(50, error("CheckBlockHeader(): proof of work failed"),
                          REJECT_INVALID, "high-hash");
 
@@ -2545,7 +2545,7 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta
     int nHeight = pindexPrev->nHeight+1;
 
     // Check proof of work
-    if ((block.nBits != GetNextWorkRequired(pindexPrev, &block)))
+    if (block.nBits != GetNextWorkRequired(pindexPrev, &block, Params().GetConsensus()))
         return state.DoS(100, error("%s: incorrect proof of work", __func__),
                          REJECT_INVALID, "bad-diffbits");
 

src/main.h

@@ -17,7 +17,6 @@
 #include "primitives/block.h"
 #include "primitives/transaction.h"
 #include "net.h"
-#include "pow.h"
 #include "script/script.h"
 #include "script/sigcache.h"
 #include "script/standard.h"

src/miner.cpp

@@ -84,7 +84,7 @@ void UpdateTime(CBlockHeader* pblock, const CBlockIndex* pindexPrev)
 
     // Updating time can change work required on testnet:
     if (Params().AllowMinDifficultyBlocks())
-        pblock->nBits = GetNextWorkRequired(pindexPrev, pblock);
+        pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, Params().GetConsensus());
 }
 
 CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
@@ -326,7 +326,7 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
         // Fill in header
         pblock->hashPrevBlock  = pindexPrev->GetBlockHash();
         UpdateTime(pblock, pindexPrev);
-        pblock->nBits          = GetNextWorkRequired(pindexPrev, pblock);
+        pblock->nBits          = GetNextWorkRequired(pindexPrev, pblock, Params().GetConsensus());
         pblock->nNonce         = 0;
         pblocktemplate->vTxSigOps[0] = GetLegacySigOpCount(pblock->vtx[0]);
 

src/pow.cpp

@@ -7,34 +7,33 @@
 
 #include "arith_uint256.h"
 #include "chain.h"
-#include "chainparams.h"
 #include "primitives/block.h"
 #include "uint256.h"
 #include "util.h"
 
-unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock)
+unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
 {
-    unsigned int nProofOfWorkLimit = Params().ProofOfWorkLimit().GetCompact();
+    unsigned int nProofOfWorkLimit = params.powLimit.GetCompact();
 
     // Genesis block
     if (pindexLast == NULL)
         return nProofOfWorkLimit;
 
     // Only change once per difficulty adjustment interval
-    if ((pindexLast->nHeight+1) % Params().DifficultyAdjustmentInterval() != 0)
+    if ((pindexLast->nHeight+1) % params.DifficultyAdjustmentInterval() != 0)
     {
-        if (Params().AllowMinDifficultyBlocks())
+        if (params.fPowAllowMinDifficultyBlocks)
         {
             // Special difficulty rule for testnet:
             // If the new block's timestamp is more than 2* 10 minutes
             // then allow mining of a min-difficulty block.
-            if (pblock->GetBlockTime() > pindexLast->GetBlockTime() + Params().TargetSpacing()*2)
+            if (pblock->GetBlockTime() > pindexLast->GetBlockTime() + params.nPowTargetSpacing*2)
                 return nProofOfWorkLimit;
             else
             {
                 // Return the last non-special-min-difficulty-rules-block
                 const CBlockIndex* pindex = pindexLast;
-                while (pindex->pprev && pindex->nHeight % Params().DifficultyAdjustmentInterval() != 0 && pindex->nBits == nProofOfWorkLimit)
+                while (pindex->pprev && pindex->nHeight % params.DifficultyAdjustmentInterval() != 0 && pindex->nBits == nProofOfWorkLimit)
                     pindex = pindex->pprev;
                 return pindex->nBits;
             }
@@ -44,22 +43,22 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
 
     // Go back by what we want to be 14 days worth of blocks
     const CBlockIndex* pindexFirst = pindexLast;
-    for (int i = 0; pindexFirst && i < Params().DifficultyAdjustmentInterval()-1; i++)
+    for (int i = 0; pindexFirst && i < params.DifficultyAdjustmentInterval()-1; i++)
         pindexFirst = pindexFirst->pprev;
     assert(pindexFirst);
 
-    return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime());
+    return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime(), params);
 }
 
-unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime)
+unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params& params)
 {
     // Limit adjustment step
     int64_t nActualTimespan = pindexLast->GetBlockTime() - nFirstBlockTime;
     LogPrintf("  nActualTimespan = %d  before bounds\n", nActualTimespan);
-    if (nActualTimespan < Params().TargetTimespan()/4)
-        nActualTimespan = Params().TargetTimespan()/4;
-    if (nActualTimespan > Params().TargetTimespan()*4)
-        nActualTimespan = Params().TargetTimespan()*4;
+    if (nActualTimespan < params.nPowTargetTimespan/4)
+        nActualTimespan = params.nPowTargetTimespan/4;
+    if (nActualTimespan > params.nPowTargetTimespan*4)
+        nActualTimespan = params.nPowTargetTimespan*4;
 
     // Retarget
     arith_uint256 bnNew;
@@ -67,21 +66,21 @@ unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nF
     bnNew.SetCompact(pindexLast->nBits);
     bnOld = bnNew;
     bnNew *= nActualTimespan;
-    bnNew /= Params().TargetTimespan();
+    bnNew /= params.nPowTargetTimespan;
 
-    if (bnNew > Params().ProofOfWorkLimit())
-        bnNew = Params().ProofOfWorkLimit();
+    if (bnNew > params.powLimit)
+        bnNew = params.powLimit;
 
     /// debug print
     LogPrintf("GetNextWorkRequired RETARGET\n");
-    LogPrintf("Params().TargetTimespan() = %d    nActualTimespan = %d\n", Params().TargetTimespan(), nActualTimespan);
+    LogPrintf("params.nPowTargetTimespan = %d    nActualTimespan = %d\n", params.nPowTargetTimespan, nActualTimespan);
     LogPrintf("Before: %08x  %s\n", pindexLast->nBits, bnOld.ToString());
     LogPrintf("After:  %08x  %s\n", bnNew.GetCompact(), bnNew.ToString());
 
     return bnNew.GetCompact();
 }
 
-bool CheckProofOfWork(uint256 hash, unsigned int nBits)
+bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params& params)
 {
     bool fNegative;
     bool fOverflow;
@@ -90,7 +89,7 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits)
     bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
 
     // Check range
-    if (fNegative || bnTarget == 0 || fOverflow || bnTarget > Params().ProofOfWorkLimit())
+    if (fNegative || bnTarget == 0 || fOverflow || bnTarget > params.powLimit)
         return error("CheckProofOfWork(): nBits below minimum work");
 
     // Check proof of work matches claimed amount

src/pow.h

@@ -6,6 +6,8 @@
 #ifndef BITCOIN_POW_H
 #define BITCOIN_POW_H
 
+#include "consensus/params.h"
+
 #include <stdint.h>
 
 class CBlockHeader;
@@ -13,11 +15,11 @@ class CBlockIndex;
 class uint256;
 class arith_uint256;
 
-unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock);
-unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime);
+unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params&);
+unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params&);
 
 /** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */
-bool CheckProofOfWork(uint256 hash, unsigned int nBits);
+bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params&);
 arith_uint256 GetBlockProof(const CBlockIndex& block);
 
 #endif // BITCOIN_POW_H

src/rpcmining.cpp

@@ -181,7 +181,7 @@ Value setgenerate(const Array& params, bool fHelp)
                 LOCK(cs_main);
                 IncrementExtraNonce(pblock, chainActive.Tip(), nExtraNonce);
             }
-            while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits)) {
+            while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus())) {
                 // Yes, there is a chance every nonce could fail to satisfy the -regtest
                 // target -- 1 in 2^(2^32). That ain't gonna happen.
                 ++pblock->nNonce;

src/test/pow_tests.cpp

@@ -17,51 +17,56 @@ BOOST_FIXTURE_TEST_SUITE(pow_tests, BasicTestingSetup)
 BOOST_AUTO_TEST_CASE(get_next_work)
 {
     SelectParams(CBaseChainParams::MAIN);
+    const Consensus::Params& params = Params().GetConsensus();
 
     int64_t nLastRetargetTime = 1261130161; // Block #30240
     CBlockIndex pindexLast;
     pindexLast.nHeight = 32255;
     pindexLast.nTime = 1262152739;  // Block #32255
     pindexLast.nBits = 0x1d00ffff;
-    BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime), 0x1d00d86a);
+    BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00d86a);
 }
 
 /* Test the constraint on the upper bound for next work */
 BOOST_AUTO_TEST_CASE(get_next_work_pow_limit)
 {
     SelectParams(CBaseChainParams::MAIN);
+    const Consensus::Params& params = Params().GetConsensus();
 
     int64_t nLastRetargetTime = 1231006505; // Block #0
     CBlockIndex pindexLast;
     pindexLast.nHeight = 2015;
     pindexLast.nTime = 1233061996;  // Block #2015
     pindexLast.nBits = 0x1d00ffff;
-    BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime), 0x1d00ffff);
+    BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00ffff);
 }
 
 /* Test the constraint on the lower bound for actual time taken */
 BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual)
 {
     SelectParams(CBaseChainParams::MAIN);
+    const Consensus::Params& params = Params().GetConsensus();
 
     int64_t nLastRetargetTime = 1279008237; // Block #66528
     CBlockIndex pindexLast;
     pindexLast.nHeight = 68543;
     pindexLast.nTime = 1279297671;  // Block #68543
     pindexLast.nBits = 0x1c05a3f4;
-    BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime), 0x1c0168fd);
+    BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1c0168fd);
 }
 
 /* Test the constraint on the upper bound for actual time taken */
 BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual)
 {
     SelectParams(CBaseChainParams::MAIN);
+    const Consensus::Params& params = Params().GetConsensus();
+
     int64_t nLastRetargetTime = 1263163443; // NOTE: Not an actual block time
     CBlockIndex pindexLast;
     pindexLast.nHeight = 46367;
     pindexLast.nTime = 1269211443;  // Block #46367
     pindexLast.nBits = 0x1c387f6f;
-    BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime), 0x1d00e1fd);
+    BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, params), 0x1d00e1fd);
 }
 
 BOOST_AUTO_TEST_SUITE_END()

src/txdb.cpp

@@ -5,6 +5,8 @@
 
 #include "txdb.h"
 
+#include "chainparams.h"
+#include "hash.h"
 #include "main.h"
 #include "pow.h"
 #include "uint256.h"
@@ -223,7 +225,7 @@ bool CBlockTreeDB::LoadBlockIndexGuts()
                 pindexNew->nStatus        = diskindex.nStatus;
                 pindexNew->nTx            = diskindex.nTx;
 
-                if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits))
+                if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits, Params().GetConsensus()))
                     return error("LoadBlockIndex(): CheckProofOfWork failed: %s", pindexNew->ToString());
 
                 pcursor->Next();