aboutsummaryrefslogtreecommitdiff
path: root/src/miner.h
blob: c105d07c231025efa63c3f2ba0c8afed235f769c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_MINER_H
#define BITCOIN_MINER_H

#include "primitives/block.h"
#include "txmempool.h"

#include <stdint.h>
#include <memory>
#include "boost/multi_index_container.hpp"
#include "boost/multi_index/ordered_index.hpp"

class CBlockIndex;
class CChainParams;
class CReserveKey;
class CScript;
class CWallet;

namespace Consensus { struct Params; };

static const bool DEFAULT_PRINTPRIORITY = false;

struct CBlockTemplate
{
    CBlock block;
    std::vector<CAmount> vTxFees;
    std::vector<int64_t> vTxSigOpsCost;
    std::vector<unsigned char> vchCoinbaseCommitment;
};

// Container for tracking updates to ancestor feerate as we include (parent)
// transactions in a block
struct CTxMemPoolModifiedEntry {
    CTxMemPoolModifiedEntry(CTxMemPool::txiter entry)
    {
        iter = entry;
        nSizeWithAncestors = entry->GetSizeWithAncestors();
        nModFeesWithAncestors = entry->GetModFeesWithAncestors();
        nSigOpCostWithAncestors = entry->GetSigOpCostWithAncestors();
    }

    CTxMemPool::txiter iter;
    uint64_t nSizeWithAncestors;
    CAmount nModFeesWithAncestors;
    int64_t nSigOpCostWithAncestors;
};

/** Comparator for CTxMemPool::txiter objects.
 *  It simply compares the internal memory address of the CTxMemPoolEntry object
 *  pointed to. This means it has no meaning, and is only useful for using them
 *  as key in other indexes.
 */
struct CompareCTxMemPoolIter {
    bool operator()(const CTxMemPool::txiter& a, const CTxMemPool::txiter& b) const
    {
        return &(*a) < &(*b);
    }
};

struct modifiedentry_iter {
    typedef CTxMemPool::txiter result_type;
    result_type operator() (const CTxMemPoolModifiedEntry &entry) const
    {
        return entry.iter;
    }
};

// This matches the calculation in CompareTxMemPoolEntryByAncestorFee,
// except operating on CTxMemPoolModifiedEntry.
// TODO: refactor to avoid duplication of this logic.
struct CompareModifiedEntry {
    bool operator()(const CTxMemPoolModifiedEntry &a, const CTxMemPoolModifiedEntry &b)
    {
        double f1 = (double)a.nModFeesWithAncestors * b.nSizeWithAncestors;
        double f2 = (double)b.nModFeesWithAncestors * a.nSizeWithAncestors;
        if (f1 == f2) {
            return CTxMemPool::CompareIteratorByHash()(a.iter, b.iter);
        }
        return f1 > f2;
    }
};

// A comparator that sorts transactions based on number of ancestors.
// This is sufficient to sort an ancestor package in an order that is valid
// to appear in a block.
struct CompareTxIterByAncestorCount {
    bool operator()(const CTxMemPool::txiter &a, const CTxMemPool::txiter &b)
    {
        if (a->GetCountWithAncestors() != b->GetCountWithAncestors())
            return a->GetCountWithAncestors() < b->GetCountWithAncestors();
        return CTxMemPool::CompareIteratorByHash()(a, b);
    }
};

typedef boost::multi_index_container<
    CTxMemPoolModifiedEntry,
    boost::multi_index::indexed_by<
        boost::multi_index::ordered_unique<
            modifiedentry_iter,
            CompareCTxMemPoolIter
        >,
        // sorted by modified ancestor fee rate
        boost::multi_index::ordered_non_unique<
            // Reuse same tag from CTxMemPool's similar index
            boost::multi_index::tag<ancestor_score>,
            boost::multi_index::identity<CTxMemPoolModifiedEntry>,
            CompareModifiedEntry
        >
    >
> indexed_modified_transaction_set;

typedef indexed_modified_transaction_set::nth_index<0>::type::iterator modtxiter;
typedef indexed_modified_transaction_set::index<ancestor_score>::type::iterator modtxscoreiter;

struct update_for_parent_inclusion
{
    update_for_parent_inclusion(CTxMemPool::txiter it) : iter(it) {}

    void operator() (CTxMemPoolModifiedEntry &e)
    {
        e.nModFeesWithAncestors -= iter->GetFee();
        e.nSizeWithAncestors -= iter->GetTxSize();
        e.nSigOpCostWithAncestors -= iter->GetSigOpCost();
    }

    CTxMemPool::txiter iter;
};

/** Generate a new block, without valid proof-of-work */
class BlockAssembler
{
private:
    // The constructed block template
    std::unique_ptr<CBlockTemplate> pblocktemplate;
    // A convenience pointer that always refers to the CBlock in pblocktemplate
    CBlock* pblock;

    // Configuration parameters for the block size
    bool fIncludeWitness;
    unsigned int nBlockMaxWeight, nBlockMaxSize;
    bool fNeedSizeAccounting;
    CFeeRate blockMinFeeRate;

    // Information on the current status of the block
    uint64_t nBlockWeight;
    uint64_t nBlockSize;
    uint64_t nBlockTx;
    uint64_t nBlockSigOpsCost;
    CAmount nFees;
    CTxMemPool::setEntries inBlock;

    // Chain context for the block
    int nHeight;
    int64_t nLockTimeCutoff;
    const CChainParams& chainparams;

public:
    struct Options {
        Options();
        size_t nBlockMaxWeight;
        size_t nBlockMaxSize;
        CFeeRate blockMinFeeRate;
    };

    BlockAssembler(const CChainParams& params);
    BlockAssembler(const CChainParams& params, const Options& options);

    /** Construct a new block template with coinbase to scriptPubKeyIn */
    std::unique_ptr<CBlockTemplate> CreateNewBlock(const CScript& scriptPubKeyIn);

private:
    // utility functions
    /** Clear the block's state and prepare for assembling a new block */
    void resetBlock();
    /** Add a tx to the block */
    void AddToBlock(CTxMemPool::txiter iter);

    // Methods for how to add transactions to a block.
    /** Add transactions based on feerate including unconfirmed ancestors */
    void addPackageTxs();

    // helper functions for addPackageTxs()
    /** Remove confirmed (inBlock) entries from given set */
    void onlyUnconfirmed(CTxMemPool::setEntries& testSet);
    /** Test if a new package would "fit" in the block */
    bool TestPackage(uint64_t packageSize, int64_t packageSigOpsCost);
    /** Perform checks on each transaction in a package:
      * locktime, premature-witness, serialized size (if necessary)
      * These checks should always succeed, and they're here
      * only as an extra check in case of suboptimal node configuration */
    bool TestPackageTransactions(const CTxMemPool::setEntries& package);
    /** Return true if given transaction from mapTx has already been evaluated,
      * or if the transaction's cached data in mapTx is incorrect. */
    bool SkipMapTxEntry(CTxMemPool::txiter it, indexed_modified_transaction_set &mapModifiedTx, CTxMemPool::setEntries &failedTx);
    /** Sort the package in an order that is valid to appear in a block */
    void SortForBlock(const CTxMemPool::setEntries& package, CTxMemPool::txiter entry, std::vector<CTxMemPool::txiter>& sortedEntries);
    /** Add descendants of given transactions to mapModifiedTx with ancestor
      * state updated assuming given transactions are inBlock. */
    void UpdatePackagesForAdded(const CTxMemPool::setEntries& alreadyAdded, indexed_modified_transaction_set &mapModifiedTx);
};

/** Modify the extranonce in a block */
void IncrementExtraNonce(CBlock* pblock, const CBlockIndex* pindexPrev, unsigned int& nExtraNonce);
int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev);

#endif // BITCOIN_MINER_H