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1 : // Copyright (c) 2024-present The Bitcoin Core developers
2 : // Distributed under the MIT software license, see the accompanying
3 : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 :
5 : #ifndef BITCOIN_INTERFACES_MINING_H
6 : #define BITCOIN_INTERFACES_MINING_H
7 :
8 : #include <consensus/amount.h>
9 : #include <interfaces/types.h>
10 : #include <node/types.h>
11 : #include <primitives/block.h>
12 : #include <primitives/transaction.h>
13 : #include <uint256.h>
14 : #include <util/time.h>
15 :
16 : #include <cstdint>
17 : #include <memory>
18 : #include <optional>
19 : #include <vector>
20 :
21 : namespace node {
22 : struct NodeContext;
23 : } // namespace node
24 :
25 : class BlockValidationState;
26 : class CScript;
27 :
28 : namespace interfaces {
29 :
30 : //! Block template interface
31 0 : class BlockTemplate
32 : {
33 : public:
34 : virtual ~BlockTemplate() = default;
35 :
36 : virtual CBlockHeader getBlockHeader() = 0;
37 : // Block contains a dummy coinbase transaction that should not be used and
38 : // it may not match a transaction constructed from getCoinbaseTx().
39 : virtual CBlock getBlock() = 0;
40 :
41 : // Fees per transaction, not including coinbase transaction.
42 : virtual std::vector<CAmount> getTxFees() = 0;
43 : // Sigop cost per transaction, not including coinbase transaction.
44 : virtual std::vector<int64_t> getTxSigops() = 0;
45 :
46 : /** Return fields needed to construct a coinbase transaction */
47 : virtual node::CoinbaseTx getCoinbaseTx() = 0;
48 :
49 : /**
50 : * Compute merkle path to the coinbase transaction
51 : *
52 : * @return merkle path ordered from the deepest
53 : */
54 : virtual std::vector<uint256> getCoinbaseMerklePath() = 0;
55 :
56 : /**
57 : * Construct and broadcast the block. Modifies the template in place,
58 : * updating the fields listed below as well as the merkle root.
59 : *
60 : * @param[in] version version block header field
61 : * @param[in] timestamp time block header field (unix timestamp)
62 : * @param[in] nonce nonce block header field
63 : * @param[in] coinbase complete coinbase transaction (including witness)
64 : *
65 : * @note unlike the submitblock RPC, this method does NOT add the
66 : * coinbase witness automatically.
67 : *
68 : * @note for heights <= 16, the BIP34 height push in getCoinbaseTx().script_sig_prefix
69 : * is only one byte long, so the coinbase scriptSig needs at least
70 : * one additional byte of data to avoid bad-cb-length.
71 : *
72 : * @returns if the block was processed, does not necessarily indicate validity.
73 : *
74 : * @note Returns true if the block is already known, which can happen if
75 : * the solved block is constructed and broadcast by multiple nodes
76 : * (e.g. both the miner who constructed the template and the pool).
77 : */
78 : virtual bool submitSolution(uint32_t version, uint32_t timestamp, uint32_t nonce, CTransactionRef coinbase) = 0;
79 :
80 : /**
81 : * Waits for fees in the next block to rise, a new tip or the timeout.
82 : *
83 : * @param[in] options Control the timeout (default forever) and by how much total fees
84 : * for the next block should rise (default infinite).
85 : *
86 : * @returns a new BlockTemplate or nothing if the timeout occurs.
87 : *
88 : * On testnet this will additionally return a template with difficulty 1 if
89 : * the tip is more than 20 minutes old.
90 : */
91 : virtual std::unique_ptr<BlockTemplate> waitNext(node::BlockWaitOptions options = {}) = 0;
92 :
93 : /**
94 : * Interrupts the current wait for the next block template.
95 : */
96 : virtual void interruptWait() = 0;
97 : };
98 :
99 : //! Interface giving clients (RPC, Stratum v2 Template Provider in the future)
100 : //! ability to create block templates.
101 0 : class Mining
102 : {
103 : public:
104 : virtual ~Mining() = default;
105 :
106 : //! If this chain is exclusively used for testing
107 : virtual bool isTestChain() = 0;
108 :
109 : //! Returns whether IBD is still in progress.
110 : virtual bool isInitialBlockDownload() = 0;
111 :
112 : //! Returns the hash and height for the tip of this chain
113 : virtual std::optional<BlockRef> getTip() = 0;
114 :
115 : /**
116 : * Waits for the connected tip to change. During node initialization, this will
117 : * wait until the tip is connected (regardless of `timeout`).
118 : *
119 : * @param[in] current_tip block hash of the current chain tip. Function waits
120 : * for the chain tip to differ from this.
121 : * @param[in] timeout how long to wait for a new tip (default is forever)
122 : *
123 : * @retval BlockRef hash and height of the current chain tip after this call.
124 : * @retval std::nullopt if the node is shut down or interrupt() is called.
125 : */
126 : virtual std::optional<BlockRef> waitTipChanged(uint256 current_tip, MillisecondsDouble timeout = MillisecondsDouble::max()) = 0;
127 :
128 : /**
129 : * Construct a new block template.
130 : *
131 : * @param[in] options options for creating the block
132 : * @param[in] cooldown wait for tip to be connected and IBD to complete.
133 : * If the best header is ahead of the tip, wait for the
134 : * tip to catch up. It's recommended to disable this on
135 : * regtest and signets with only one miner, as these
136 : * could stall.
137 : * @retval BlockTemplate a block template.
138 : * @retval std::nullptr if the node is shut down or interrupt() is called.
139 : */
140 : virtual std::unique_ptr<BlockTemplate> createNewBlock(const node::BlockCreateOptions& options = {}, bool cooldown = true) = 0;
141 :
142 : /**
143 : * Interrupts createNewBlock and waitTipChanged.
144 : */
145 : virtual void interrupt() = 0;
146 :
147 : /**
148 : * Checks if a given block is valid.
149 : *
150 : * @param[in] block the block to check
151 : * @param[in] options verification options: the proof-of-work check can be
152 : * skipped in order to verify a template generated by
153 : * external software.
154 : * @param[out] reason failure reason (BIP22)
155 : * @param[out] debug more detailed rejection reason
156 : * @returns whether the block is valid
157 : *
158 : * For signets the challenge verification is skipped when check_pow is false.
159 : */
160 : virtual bool checkBlock(const CBlock& block, const node::BlockCheckOptions& options, std::string& reason, std::string& debug) = 0;
161 :
162 : //! Get internal node context. Useful for RPC and testing,
163 : //! but not accessible across processes.
164 0 : virtual node::NodeContext* context() { return nullptr; }
165 : };
166 :
167 : //! Return implementation of Mining interface.
168 : //!
169 : //! @param[in] wait_loaded waits for chainstate data to be loaded before
170 : //! returning. Used to prevent external clients from
171 : //! being able to crash the node during startup.
172 : std::unique_ptr<Mining> MakeMining(node::NodeContext& node, bool wait_loaded=true);
173 :
174 : } // namespace interfaces
175 :
176 : #endif // BITCOIN_INTERFACES_MINING_H
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