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1 : : // Copyright (c) 2018-2022 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_CHAIN_H
6 : : #define BITCOIN_INTERFACES_CHAIN_H
7 : :
8 : : #include <blockfilter.h>
9 : : #include <common/settings.h>
10 : : #include <primitives/transaction.h> // For CTransactionRef
11 : :
12 : : #include <functional>
13 : : #include <memory>
14 : : #include <optional>
15 : : #include <stddef.h>
16 : : #include <stdint.h>
17 : : #include <string>
18 : : #include <vector>
19 : :
20 : : class ArgsManager;
21 : : class CBlock;
22 : : class CBlockUndo;
23 : : class CFeeRate;
24 : : class CRPCCommand;
25 : : class CScheduler;
26 : : class Coin;
27 : : class uint256;
28 : : enum class MemPoolRemovalReason;
29 : : enum class RBFTransactionState;
30 : : enum class ChainstateRole;
31 : : struct bilingual_str;
32 : : struct CBlockLocator;
33 : : struct FeeCalculation;
34 : : namespace node {
35 : : struct NodeContext;
36 : : } // namespace node
37 : :
38 : : namespace interfaces {
39 : :
40 : : class Handler;
41 : : class Wallet;
42 : :
43 : : //! Hash/height pair to help track and identify blocks.
44 : : struct BlockKey {
45 : : uint256 hash;
46 : : int height = -1;
47 : : };
48 : :
49 : : //! Helper for findBlock to selectively return pieces of block data. If block is
50 : : //! found, data will be returned by setting specified output variables. If block
51 : : //! is not found, output variables will keep their previous values.
52 : 0 : class FoundBlock
53 : : {
54 : : public:
55 : 0 : FoundBlock& hash(uint256& hash) { m_hash = &hash; return *this; }
56 : 0 : FoundBlock& height(int& height) { m_height = &height; return *this; }
57 : 0 : FoundBlock& time(int64_t& time) { m_time = &time; return *this; }
58 : 0 : FoundBlock& maxTime(int64_t& max_time) { m_max_time = &max_time; return *this; }
59 : 0 : FoundBlock& mtpTime(int64_t& mtp_time) { m_mtp_time = &mtp_time; return *this; }
60 : : //! Return whether block is in the active (most-work) chain.
61 : 0 : FoundBlock& inActiveChain(bool& in_active_chain) { m_in_active_chain = &in_active_chain; return *this; }
62 : : //! Return locator if block is in the active chain.
63 : 0 : FoundBlock& locator(CBlockLocator& locator) { m_locator = &locator; return *this; }
64 : : //! Return next block in the active chain if current block is in the active chain.
65 : 0 : FoundBlock& nextBlock(const FoundBlock& next_block) { m_next_block = &next_block; return *this; }
66 : : //! Read block data from disk. If the block exists but doesn't have data
67 : : //! (for example due to pruning), the CBlock variable will be set to null.
68 : 0 : FoundBlock& data(CBlock& data) { m_data = &data; return *this; }
69 : :
70 : 0 : uint256* m_hash = nullptr;
71 : 0 : int* m_height = nullptr;
72 : 0 : int64_t* m_time = nullptr;
73 : 0 : int64_t* m_max_time = nullptr;
74 : 0 : int64_t* m_mtp_time = nullptr;
75 : 0 : bool* m_in_active_chain = nullptr;
76 : 0 : CBlockLocator* m_locator = nullptr;
77 : 0 : const FoundBlock* m_next_block = nullptr;
78 : 0 : CBlock* m_data = nullptr;
79 : 0 : mutable bool found = false;
80 : : };
81 : :
82 : : //! Block data sent with blockConnected, blockDisconnected notifications.
83 : : struct BlockInfo {
84 : : const uint256& hash;
85 : 0 : const uint256* prev_hash = nullptr;
86 : 0 : int height = -1;
87 : 0 : int file_number = -1;
88 : 0 : unsigned data_pos = 0;
89 : 0 : const CBlock* data = nullptr;
90 : 0 : const CBlockUndo* undo_data = nullptr;
91 : : // The maximum time in the chain up to and including this block.
92 : : // A timestamp that can only move forward.
93 : 0 : unsigned int chain_time_max{0};
94 : :
95 : 0 : BlockInfo(const uint256& hash LIFETIMEBOUND) : hash(hash) {}
96 : : };
97 : :
98 : : //! Interface giving clients (wallet processes, maybe other analysis tools in
99 : : //! the future) ability to access to the chain state, receive notifications,
100 : : //! estimate fees, and submit transactions.
101 : : //!
102 : : //! TODO: Current chain methods are too low level, exposing too much of the
103 : : //! internal workings of the bitcoin node, and not being very convenient to use.
104 : : //! Chain methods should be cleaned up and simplified over time. Examples:
105 : : //!
106 : : //! * The initMessages() and showProgress() methods which the wallet uses to send
107 : : //! notifications to the GUI should go away when GUI and wallet can directly
108 : : //! communicate with each other without going through the node
109 : : //! (https://github.com/bitcoin/bitcoin/pull/15288#discussion_r253321096).
110 : : //!
111 : : //! * The handleRpc, registerRpcs, rpcEnableDeprecated methods and other RPC
112 : : //! methods can go away if wallets listen for HTTP requests on their own
113 : : //! ports instead of registering to handle requests on the node HTTP port.
114 : : //!
115 : : //! * Move fee estimation queries to an asynchronous interface and let the
116 : : //! wallet cache it, fee estimation being driven by node mempool, wallet
117 : : //! should be the consumer.
118 : : //!
119 : : //! * `guessVerificationProgress` and similar methods can go away if rescan
120 : : //! logic moves out of the wallet, and the wallet just requests scans from the
121 : : //! node (https://github.com/bitcoin/bitcoin/issues/11756)
122 : 0 : class Chain
123 : : {
124 : : public:
125 : 1 : virtual ~Chain() {}
126 : :
127 : : //! Get current chain height, not including genesis block (returns 0 if
128 : : //! chain only contains genesis block, nullopt if chain does not contain
129 : : //! any blocks)
130 : : virtual std::optional<int> getHeight() = 0;
131 : :
132 : : //! Get block hash. Height must be valid or this function will abort.
133 : : virtual uint256 getBlockHash(int height) = 0;
134 : :
135 : : //! Check that the block is available on disk (i.e. has not been
136 : : //! pruned), and contains transactions.
137 : : virtual bool haveBlockOnDisk(int height) = 0;
138 : :
139 : : //! Get locator for the current chain tip.
140 : : virtual CBlockLocator getTipLocator() = 0;
141 : :
142 : : //! Return a locator that refers to a block in the active chain.
143 : : //! If specified block is not in the active chain, return locator for the latest ancestor that is in the chain.
144 : : virtual CBlockLocator getActiveChainLocator(const uint256& block_hash) = 0;
145 : :
146 : : //! Return height of the highest block on chain in common with the locator,
147 : : //! which will either be the original block used to create the locator,
148 : : //! or one of its ancestors.
149 : : virtual std::optional<int> findLocatorFork(const CBlockLocator& locator) = 0;
150 : :
151 : : //! Returns whether a block filter index is available.
152 : : virtual bool hasBlockFilterIndex(BlockFilterType filter_type) = 0;
153 : :
154 : : //! Returns whether any of the elements match the block via a BIP 157 block filter
155 : : //! or std::nullopt if the block filter for this block couldn't be found.
156 : : virtual std::optional<bool> blockFilterMatchesAny(BlockFilterType filter_type, const uint256& block_hash, const GCSFilter::ElementSet& filter_set) = 0;
157 : :
158 : : //! Return whether node has the block and optionally return block metadata
159 : : //! or contents.
160 : : virtual bool findBlock(const uint256& hash, const FoundBlock& block={}) = 0;
161 : :
162 : : //! Find first block in the chain with timestamp >= the given time
163 : : //! and height >= than the given height, return false if there is no block
164 : : //! with a high enough timestamp and height. Optionally return block
165 : : //! information.
166 : : virtual bool findFirstBlockWithTimeAndHeight(int64_t min_time, int min_height, const FoundBlock& block={}) = 0;
167 : :
168 : : //! Find ancestor of block at specified height and optionally return
169 : : //! ancestor information.
170 : : virtual bool findAncestorByHeight(const uint256& block_hash, int ancestor_height, const FoundBlock& ancestor_out={}) = 0;
171 : :
172 : : //! Return whether block descends from a specified ancestor, and
173 : : //! optionally return ancestor information.
174 : : virtual bool findAncestorByHash(const uint256& block_hash,
175 : : const uint256& ancestor_hash,
176 : : const FoundBlock& ancestor_out={}) = 0;
177 : :
178 : : //! Find most recent common ancestor between two blocks and optionally
179 : : //! return block information.
180 : : virtual bool findCommonAncestor(const uint256& block_hash1,
181 : : const uint256& block_hash2,
182 : : const FoundBlock& ancestor_out={},
183 : : const FoundBlock& block1_out={},
184 : : const FoundBlock& block2_out={}) = 0;
185 : :
186 : : //! Look up unspent output information. Returns coins in the mempool and in
187 : : //! the current chain UTXO set. Iterates through all the keys in the map and
188 : : //! populates the values.
189 : : virtual void findCoins(std::map<COutPoint, Coin>& coins) = 0;
190 : :
191 : : //! Estimate fraction of total transactions verified if blocks up to
192 : : //! the specified block hash are verified.
193 : : virtual double guessVerificationProgress(const uint256& block_hash) = 0;
194 : :
195 : : //! Return true if data is available for all blocks in the specified range
196 : : //! of blocks. This checks all blocks that are ancestors of block_hash in
197 : : //! the height range from min_height to max_height, inclusive.
198 : : virtual bool hasBlocks(const uint256& block_hash, int min_height = 0, std::optional<int> max_height = {}) = 0;
199 : :
200 : : //! Check if transaction is RBF opt in.
201 : : virtual RBFTransactionState isRBFOptIn(const CTransaction& tx) = 0;
202 : :
203 : : //! Check if transaction is in mempool.
204 : : virtual bool isInMempool(const uint256& txid) = 0;
205 : :
206 : : //! Check if transaction has descendants in mempool.
207 : : virtual bool hasDescendantsInMempool(const uint256& txid) = 0;
208 : :
209 : : //! Transaction is added to memory pool, if the transaction fee is below the
210 : : //! amount specified by max_tx_fee, and broadcast to all peers if relay is set to true.
211 : : //! Return false if the transaction could not be added due to the fee or for another reason.
212 : : virtual bool broadcastTransaction(const CTransactionRef& tx,
213 : : const CAmount& max_tx_fee,
214 : : bool relay,
215 : : std::string& err_string) = 0;
216 : :
217 : : //! Calculate mempool ancestor and descendant counts for the given transaction.
218 : : virtual void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants, size_t* ancestorsize = nullptr, CAmount* ancestorfees = nullptr) = 0;
219 : :
220 : : //! For each outpoint, calculate the fee-bumping cost to spend this outpoint at the specified
221 : : // feerate, including bumping its ancestors. For example, if the target feerate is 10sat/vbyte
222 : : // and this outpoint refers to a mempool transaction at 3sat/vbyte, the bump fee includes the
223 : : // cost to bump the mempool transaction to 10sat/vbyte (i.e. 7 * mempooltx.vsize). If that
224 : : // transaction also has, say, an unconfirmed parent with a feerate of 1sat/vbyte, the bump fee
225 : : // includes the cost to bump the parent (i.e. 9 * parentmempooltx.vsize).
226 : : //
227 : : // If the outpoint comes from an unconfirmed transaction that is already above the target
228 : : // feerate or bumped by its descendant(s) already, it does not need to be bumped. Its bump fee
229 : : // is 0. Likewise, if any of the transaction's ancestors are already bumped by a transaction
230 : : // in our mempool, they are not included in the transaction's bump fee.
231 : : //
232 : : // Also supported is bump-fee calculation in the case of replacements. If an outpoint
233 : : // conflicts with another transaction in the mempool, it is assumed that the goal is to replace
234 : : // that transaction. As such, the calculation will exclude the to-be-replaced transaction, but
235 : : // will include the fee-bumping cost. If bump fees of descendants of the to-be-replaced
236 : : // transaction are requested, the value will be 0. Fee-related RBF rules are not included as
237 : : // they are logically distinct.
238 : : //
239 : : // Any outpoints that are otherwise unavailable from the mempool (e.g. UTXOs from confirmed
240 : : // transactions or transactions not yet broadcast by the wallet) are given a bump fee of 0.
241 : : //
242 : : // If multiple outpoints come from the same transaction (which would be very rare because
243 : : // it means that one transaction has multiple change outputs or paid the same wallet using multiple
244 : : // outputs in the same transaction) or have shared ancestry, the bump fees are calculated
245 : : // independently, i.e. as if only one of them is spent. This may result in double-fee-bumping. This
246 : : // caveat can be rectified per use of the sister-function CalculateCombinedBumpFee(…).
247 : : virtual std::map<COutPoint, CAmount> CalculateIndividualBumpFees(const std::vector<COutPoint>& outpoints, const CFeeRate& target_feerate) = 0;
248 : :
249 : : //! Calculate the combined bump fee for an input set per the same strategy
250 : : // as in CalculateIndividualBumpFees(…).
251 : : // Unlike CalculateIndividualBumpFees(…), this does not return individual
252 : : // bump fees per outpoint, but a single bump fee for the shared ancestry.
253 : : // The combined bump fee may be used to correct overestimation due to
254 : : // shared ancestry by multiple UTXOs after coin selection.
255 : : virtual std::optional<CAmount> CalculateCombinedBumpFee(const std::vector<COutPoint>& outpoints, const CFeeRate& target_feerate) = 0;
256 : :
257 : : //! Get the node's package limits.
258 : : //! Currently only returns the ancestor and descendant count limits, but could be enhanced to
259 : : //! return more policy settings.
260 : : virtual void getPackageLimits(unsigned int& limit_ancestor_count, unsigned int& limit_descendant_count) = 0;
261 : :
262 : : //! Check if transaction will pass the mempool's chain limits.
263 : : virtual bool checkChainLimits(const CTransactionRef& tx) = 0;
264 : :
265 : : //! Estimate smart fee.
266 : : virtual CFeeRate estimateSmartFee(int num_blocks, bool conservative, FeeCalculation* calc = nullptr) = 0;
267 : :
268 : : //! Fee estimator max target.
269 : : virtual unsigned int estimateMaxBlocks() = 0;
270 : :
271 : : //! Mempool minimum fee.
272 : : virtual CFeeRate mempoolMinFee() = 0;
273 : :
274 : : //! Relay current minimum fee (from -minrelaytxfee and -incrementalrelayfee settings).
275 : : virtual CFeeRate relayMinFee() = 0;
276 : :
277 : : //! Relay incremental fee setting (-incrementalrelayfee), reflecting cost of relay.
278 : : virtual CFeeRate relayIncrementalFee() = 0;
279 : :
280 : : //! Relay dust fee setting (-dustrelayfee), reflecting lowest rate it's economical to spend.
281 : : virtual CFeeRate relayDustFee() = 0;
282 : :
283 : : //! Check if any block has been pruned.
284 : : virtual bool havePruned() = 0;
285 : :
286 : : //! Check if the node is ready to broadcast transactions.
287 : : virtual bool isReadyToBroadcast() = 0;
288 : :
289 : : //! Check if in IBD.
290 : : virtual bool isInitialBlockDownload() = 0;
291 : :
292 : : //! Check if shutdown requested.
293 : : virtual bool shutdownRequested() = 0;
294 : :
295 : : //! Send init message.
296 : : virtual void initMessage(const std::string& message) = 0;
297 : :
298 : : //! Send init warning.
299 : : virtual void initWarning(const bilingual_str& message) = 0;
300 : :
301 : : //! Send init error.
302 : : virtual void initError(const bilingual_str& message) = 0;
303 : :
304 : : //! Send progress indicator.
305 : : virtual void showProgress(const std::string& title, int progress, bool resume_possible) = 0;
306 : :
307 : : //! Chain notifications.
308 : 0 : class Notifications
309 : : {
310 : : public:
311 : 0 : virtual ~Notifications() {}
312 : 0 : virtual void transactionAddedToMempool(const CTransactionRef& tx) {}
313 : 0 : virtual void transactionRemovedFromMempool(const CTransactionRef& tx, MemPoolRemovalReason reason) {}
314 : 0 : virtual void blockConnected(ChainstateRole role, const BlockInfo& block) {}
315 : 0 : virtual void blockDisconnected(const BlockInfo& block) {}
316 : 0 : virtual void updatedBlockTip() {}
317 : 0 : virtual void chainStateFlushed(ChainstateRole role, const CBlockLocator& locator) {}
318 : : };
319 : :
320 : : //! Register handler for notifications.
321 : : virtual std::unique_ptr<Handler> handleNotifications(std::shared_ptr<Notifications> notifications) = 0;
322 : :
323 : : //! Wait for pending notifications to be processed unless block hash points to the current
324 : : //! chain tip.
325 : : virtual void waitForNotificationsIfTipChanged(const uint256& old_tip) = 0;
326 : :
327 : : //! Register handler for RPC. Command is not copied, so reference
328 : : //! needs to remain valid until Handler is disconnected.
329 : : virtual std::unique_ptr<Handler> handleRpc(const CRPCCommand& command) = 0;
330 : :
331 : : //! Check if deprecated RPC is enabled.
332 : : virtual bool rpcEnableDeprecated(const std::string& method) = 0;
333 : :
334 : : //! Run function after given number of seconds. Cancel any previous calls with same name.
335 : : virtual void rpcRunLater(const std::string& name, std::function<void()> fn, int64_t seconds) = 0;
336 : :
337 : : //! Current RPC serialization flags.
338 : : virtual int rpcSerializationFlags() = 0;
339 : :
340 : : //! Get settings value.
341 : : virtual common::SettingsValue getSetting(const std::string& arg) = 0;
342 : :
343 : : //! Get list of settings values.
344 : : virtual std::vector<common::SettingsValue> getSettingsList(const std::string& arg) = 0;
345 : :
346 : : //! Return <datadir>/settings.json setting value.
347 : : virtual common::SettingsValue getRwSetting(const std::string& name) = 0;
348 : :
349 : : //! Write a setting to <datadir>/settings.json. Optionally just update the
350 : : //! setting in memory and do not write the file.
351 : : virtual bool updateRwSetting(const std::string& name, const common::SettingsValue& value, bool write=true) = 0;
352 : :
353 : : //! Synchronously send transactionAddedToMempool notifications about all
354 : : //! current mempool transactions to the specified handler and return after
355 : : //! the last one is sent. These notifications aren't coordinated with async
356 : : //! notifications sent by handleNotifications, so out of date async
357 : : //! notifications from handleNotifications can arrive during and after
358 : : //! synchronous notifications from requestMempoolTransactions. Clients need
359 : : //! to be prepared to handle this by ignoring notifications about unknown
360 : : //! removed transactions and already added new transactions.
361 : : virtual void requestMempoolTransactions(Notifications& notifications) = 0;
362 : :
363 : : //! Return true if an assumed-valid chain is in use.
364 : : virtual bool hasAssumedValidChain() = 0;
365 : :
366 : : //! Get internal node context. Useful for testing, but not
367 : : //! accessible across processes.
368 : 0 : virtual node::NodeContext* context() { return nullptr; }
369 : : };
370 : :
371 : : //! Interface to let node manage chain clients (wallets, or maybe tools for
372 : : //! monitoring and analysis in the future).
373 : 0 : class ChainClient
374 : : {
375 : : public:
376 : 0 : virtual ~ChainClient() {}
377 : :
378 : : //! Register rpcs.
379 : : virtual void registerRpcs() = 0;
380 : :
381 : : //! Check for errors before loading.
382 : : virtual bool verify() = 0;
383 : :
384 : : //! Load saved state.
385 : : virtual bool load() = 0;
386 : :
387 : : //! Start client execution and provide a scheduler.
388 : : virtual void start(CScheduler& scheduler) = 0;
389 : :
390 : : //! Save state to disk.
391 : : virtual void flush() = 0;
392 : :
393 : : //! Shut down client.
394 : : virtual void stop() = 0;
395 : :
396 : : //! Set mock time.
397 : : virtual void setMockTime(int64_t time) = 0;
398 : : };
399 : :
400 : : //! Return implementation of Chain interface.
401 : : std::unique_ptr<Chain> MakeChain(node::NodeContext& node);
402 : :
403 : : } // namespace interfaces
404 : :
405 : : #endif // BITCOIN_INTERFACES_CHAIN_H
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