Branch data Line data Source code
1 : : // Copyright (c) 2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-2022 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 : :
6 : : #include <core_io.h>
7 : : #include <policy/feerate.h>
8 : : #include <policy/fees.h>
9 : : #include <rpc/protocol.h>
10 : : #include <rpc/request.h>
11 : : #include <rpc/server.h>
12 : : #include <rpc/server_util.h>
13 : : #include <rpc/util.h>
14 : : #include <txmempool.h>
15 : : #include <univalue.h>
16 : : #include <util/fees.h>
17 [ + - ]: 2 :
18 [ + - ]: 2 : #include <algorithm>
19 : : #include <array>
20 : : #include <cmath>
21 : : #include <string>
22 : :
23 : : namespace node {
24 : : struct NodeContext;
25 : : }
26 : :
27 : 2 : using node::NodeContext;
28 : :
29 : 2 : static RPCHelpMan estimatesmartfee()
30 : : {
31 [ + - - + : 4 : return RPCHelpMan{"estimatesmartfee",
# # # # #
# ]
32 [ + - ]: 2 : "\nEstimates the approximate fee per kilobyte needed for a transaction to begin\n"
33 : : "confirmation within conf_target blocks if possible and return the number of blocks\n"
34 : : "for which the estimate is valid. Uses virtual transaction size as defined\n"
35 : : "in BIP 141 (witness data is discounted).\n",
36 [ + - ]: 6 : {
37 [ + - + - : 2 : {"conf_target", RPCArg::Type::NUM, RPCArg::Optional::NO, "Confirmation target in blocks (1 - 1008)"},
+ - ]
38 [ + - + - : 4 : {"estimate_mode", RPCArg::Type::STR, RPCArg::Default{"conservative"}, "The fee estimate mode.\n"
+ - ]
39 : : "Whether to return a more conservative estimate which also satisfies\n"
40 : : "a longer history. A conservative estimate potentially returns a\n"
41 : : "higher feerate and is more likely to be sufficient for the desired\n"
42 : : "target, but is not as responsive to short term drops in the\n"
43 : : "prevailing fee market. Must be one of (case insensitive):\n"
44 [ + - + - : 2 : "\"" + FeeModes("\"\n\"") + "\""},
+ - + - ]
45 : : },
46 [ + - + - ]: 2 : RPCResult{
47 [ + - + - ]: 2 : RPCResult::Type::OBJ, "", "",
48 [ + - ]: 8 : {
49 [ + - + - : 2 : {RPCResult::Type::NUM, "feerate", /*optional=*/true, "estimate fee rate in " + CURRENCY_UNIT + "/kvB (only present if no errors were encountered)"},
+ - + - ]
50 [ + - + - : 4 : {RPCResult::Type::ARR, "errors", /*optional=*/true, "Errors encountered during processing (if there are any)",
+ - ]
51 [ + - ]: 4 : {
52 [ + - + - : 2 : {RPCResult::Type::STR, "", "error"},
+ - ]
53 : : }},
54 [ + - + - : 2 : {RPCResult::Type::NUM, "blocks", "block number where estimate was found\n"
+ - ]
55 : : "The request target will be clamped between 2 and the highest target\n"
56 : : "fee estimation is able to return based on how long it has been running.\n"
57 : : "An error is returned if not enough transactions and blocks\n"
58 : : "have been observed to make an estimate for any number of blocks."},
59 : : }},
60 [ + - ]: 2 : RPCExamples{
61 [ + - + - : 4 : HelpExampleCli("estimatesmartfee", "6") +
+ - + - ]
62 [ + - + - : 2 : HelpExampleRpc("estimatesmartfee", "6")
+ - ]
63 : : },
64 [ + - ]: 2 : [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
65 : : {
66 : 0 : CBlockPolicyEstimator& fee_estimator = EnsureAnyFeeEstimator(request.context);
67 : 0 : const NodeContext& node = EnsureAnyNodeContext(request.context);
68 : 0 : const CTxMemPool& mempool = EnsureMemPool(node);
69 : :
70 : 0 : unsigned int max_target = fee_estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
71 : 0 : unsigned int conf_target = ParseConfirmTarget(request.params[0], max_target);
72 : 0 : bool conservative = true;
73 [ # # ]: 0 : if (!request.params[1].isNull()) {
74 : 2 : FeeEstimateMode fee_mode;
75 [ # # ]: 0 : if (!FeeModeFromString(request.params[1].get_str(), fee_mode)) {
76 [ # # # # : 0 : throw JSONRPCError(RPC_INVALID_PARAMETER, InvalidEstimateModeErrorMessage());
# # # # ]
77 : : }
78 [ # # ]: 0 : if (fee_mode == FeeEstimateMode::ECONOMICAL) conservative = false;
79 : 0 : }
80 : :
81 [ # # ]: 0 : UniValue result(UniValue::VOBJ);
82 [ # # ]: 0 : UniValue errors(UniValue::VARR);
83 : 0 : FeeCalculation feeCalc;
84 [ # # ]: 0 : CFeeRate feeRate{fee_estimator.estimateSmartFee(conf_target, &feeCalc, conservative)};
85 [ # # # # : 0 : if (feeRate != CFeeRate(0)) {
# # ]
86 [ # # ]: 0 : CFeeRate min_mempool_feerate{mempool.GetMinFee()};
87 : 0 : CFeeRate min_relay_feerate{mempool.m_min_relay_feerate};
88 [ # # ]: 0 : feeRate = std::max({feeRate, min_mempool_feerate, min_relay_feerate});
89 [ # # # # : 0 : result.pushKV("feerate", ValueFromAmount(feeRate.GetFeePerK()));
# # # # ]
90 : 0 : } else {
91 [ # # # # ]: 0 : errors.push_back("Insufficient data or no feerate found");
92 [ # # # # : 0 : result.pushKV("errors", errors);
# # ]
93 : : }
94 [ # # # # : 0 : result.pushKV("blocks", feeCalc.returnedTarget);
# # ]
95 : 0 : return result;
96 [ # # ]: 0 : },
97 : : };
98 : 0 : }
99 : :
100 : 2 : static RPCHelpMan estimaterawfee()
101 : : {
102 [ + - - + : 4 : return RPCHelpMan{"estimaterawfee",
# # # # #
# # # # #
# # # # #
# ]
103 [ + - ]: 2 : "\nWARNING: This interface is unstable and may disappear or change!\n"
104 : : "\nWARNING: This is an advanced API call that is tightly coupled to the specific\n"
105 : : "implementation of fee estimation. The parameters it can be called with\n"
106 : : "and the results it returns will change if the internal implementation changes.\n"
107 : : "\nEstimates the approximate fee per kilobyte needed for a transaction to begin\n"
108 : : "confirmation within conf_target blocks if possible. Uses virtual transaction size as\n"
109 : : "defined in BIP 141 (witness data is discounted).\n",
110 [ + - ]: 6 : {
111 [ + - + - : 2 : {"conf_target", RPCArg::Type::NUM, RPCArg::Optional::NO, "Confirmation target in blocks (1 - 1008)"},
+ - ]
112 [ + - + - : 2 : {"threshold", RPCArg::Type::NUM, RPCArg::Default{0.95}, "The proportion of transactions in a given feerate range that must have been\n"
+ - + - ]
113 : : "confirmed within conf_target in order to consider those feerates as high enough and proceed to check\n"
114 : : "lower buckets."},
115 : : },
116 [ + - + - ]: 2 : RPCResult{
117 [ + - + - ]: 2 : RPCResult::Type::OBJ, "", "Results are returned for any horizon which tracks blocks up to the confirmation target",
118 [ + - ]: 8 : {
119 [ + - + - : 4 : {RPCResult::Type::OBJ, "short", /*optional=*/true, "estimate for short time horizon",
+ - ]
120 [ + - ]: 14 : {
121 [ + - + - : 2 : {RPCResult::Type::NUM, "feerate", /*optional=*/true, "estimate fee rate in " + CURRENCY_UNIT + "/kvB"},
+ - + - ]
122 [ + - + - : 2 : {RPCResult::Type::NUM, "decay", "exponential decay (per block) for historical moving average of confirmation data"},
+ - ]
123 [ + - + - : 2 : {RPCResult::Type::NUM, "scale", "The resolution of confirmation targets at this time horizon"},
+ - ]
124 [ + - + - : 4 : {RPCResult::Type::OBJ, "pass", /*optional=*/true, "information about the lowest range of feerates to succeed in meeting the threshold",
+ - ]
125 [ + - ]: 14 : {
126 [ + - + - : 2 : {RPCResult::Type::NUM, "startrange", "start of feerate range"},
+ - ]
127 [ + - + - : 2 : {RPCResult::Type::NUM, "endrange", "end of feerate range"},
+ - ]
128 [ + - + - : 2 : {RPCResult::Type::NUM, "withintarget", "number of txs over history horizon in the feerate range that were confirmed within target"},
+ - ]
129 [ + - + - : 2 : {RPCResult::Type::NUM, "totalconfirmed", "number of txs over history horizon in the feerate range that were confirmed at any point"},
+ - ]
130 [ + - + - : 2 : {RPCResult::Type::NUM, "inmempool", "current number of txs in mempool in the feerate range unconfirmed for at least target blocks"},
+ - ]
131 [ + - + - : 2 : {RPCResult::Type::NUM, "leftmempool", "number of txs over history horizon in the feerate range that left mempool unconfirmed after target"},
+ - ]
132 : : }},
133 [ + - + - : 4 : {RPCResult::Type::OBJ, "fail", /*optional=*/true, "information about the highest range of feerates to fail to meet the threshold",
+ - ]
134 [ + - ]: 4 : {
135 [ + - + - : 2 : {RPCResult::Type::ELISION, "", ""},
+ - ]
136 : : }},
137 [ + - + - : 4 : {RPCResult::Type::ARR, "errors", /*optional=*/true, "Errors encountered during processing (if there are any)",
+ - ]
138 [ + - ]: 4 : {
139 [ + - + - : 2 : {RPCResult::Type::STR, "error", ""},
+ - ]
140 : : }},
141 : : }},
142 [ + - + - : 4 : {RPCResult::Type::OBJ, "medium", /*optional=*/true, "estimate for medium time horizon",
+ - ]
143 [ + - ]: 4 : {
144 [ + - + - : 2 : {RPCResult::Type::ELISION, "", ""},
+ - ]
145 : : }},
146 [ + - + - : 4 : {RPCResult::Type::OBJ, "long", /*optional=*/true, "estimate for long time horizon",
+ - ]
147 [ + - ]: 4 : {
148 [ + - + - : 2 : {RPCResult::Type::ELISION, "", ""},
+ - ]
149 : : }},
150 : : }},
151 [ + - ]: 2 : RPCExamples{
152 [ + - + - : 2 : HelpExampleCli("estimaterawfee", "6 0.9")
+ - ]
153 : : },
154 [ + - ]: 2 : [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
155 : : {
156 : 0 : CBlockPolicyEstimator& fee_estimator = EnsureAnyFeeEstimator(request.context);
157 : :
158 : 0 : unsigned int max_target = fee_estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
159 : 0 : unsigned int conf_target = ParseConfirmTarget(request.params[0], max_target);
160 : 0 : double threshold = 0.95;
161 [ # # ]: 0 : if (!request.params[1].isNull()) {
162 : 0 : threshold = request.params[1].get_real();
163 : 0 : }
164 [ # # ]: 0 : if (threshold < 0 || threshold > 1) {
165 [ # # # # : 0 : throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid threshold");
# # # # ]
166 : : }
167 : :
168 [ # # ]: 0 : UniValue result(UniValue::VOBJ);
169 : :
170 [ # # ]: 0 : for (const FeeEstimateHorizon horizon : ALL_FEE_ESTIMATE_HORIZONS) {
171 [ # # ]: 0 : CFeeRate feeRate;
172 : 0 : EstimationResult buckets;
173 : :
174 : : // Only output results for horizons which track the target
175 [ # # # # ]: 0 : if (conf_target > fee_estimator.HighestTargetTracked(horizon)) continue;
176 : :
177 [ # # ]: 0 : feeRate = fee_estimator.estimateRawFee(conf_target, threshold, horizon, &buckets);
178 [ # # ]: 0 : UniValue horizon_result(UniValue::VOBJ);
179 [ # # ]: 0 : UniValue errors(UniValue::VARR);
180 [ # # ]: 0 : UniValue passbucket(UniValue::VOBJ);
181 [ # # # # : 0 : passbucket.pushKV("startrange", round(buckets.pass.start));
# # ]
182 [ # # # # : 0 : passbucket.pushKV("endrange", round(buckets.pass.end));
# # ]
183 [ # # # # : 0 : passbucket.pushKV("withintarget", round(buckets.pass.withinTarget * 100.0) / 100.0);
# # ]
184 [ # # # # : 0 : passbucket.pushKV("totalconfirmed", round(buckets.pass.totalConfirmed * 100.0) / 100.0);
# # ]
185 [ # # # # : 0 : passbucket.pushKV("inmempool", round(buckets.pass.inMempool * 100.0) / 100.0);
# # ]
186 [ # # # # : 0 : passbucket.pushKV("leftmempool", round(buckets.pass.leftMempool * 100.0) / 100.0);
# # ]
187 [ # # ]: 0 : UniValue failbucket(UniValue::VOBJ);
188 [ # # # # : 0 : failbucket.pushKV("startrange", round(buckets.fail.start));
# # ]
189 [ # # # # : 0 : failbucket.pushKV("endrange", round(buckets.fail.end));
# # ]
190 [ # # # # : 0 : failbucket.pushKV("withintarget", round(buckets.fail.withinTarget * 100.0) / 100.0);
# # ]
191 [ # # # # : 0 : failbucket.pushKV("totalconfirmed", round(buckets.fail.totalConfirmed * 100.0) / 100.0);
# # ]
192 [ # # # # : 0 : failbucket.pushKV("inmempool", round(buckets.fail.inMempool * 100.0) / 100.0);
# # ]
193 [ # # # # : 0 : failbucket.pushKV("leftmempool", round(buckets.fail.leftMempool * 100.0) / 100.0);
# # ]
194 : :
195 : : // CFeeRate(0) is used to indicate error as a return value from estimateRawFee
196 [ # # # # ]: 0 : if (feeRate != CFeeRate(0)) {
197 [ # # # # : 0 : horizon_result.pushKV("feerate", ValueFromAmount(feeRate.GetFeePerK()));
# # ]
198 [ # # # # : 0 : horizon_result.pushKV("decay", buckets.decay);
# # ]
199 [ # # # # : 0 : horizon_result.pushKV("scale", (int)buckets.scale);
# # ]
200 [ # # # # : 0 : horizon_result.pushKV("pass", passbucket);
# # ]
201 : : // buckets.fail.start == -1 indicates that all buckets passed, there is no fail bucket to output
202 [ # # # # : 0 : if (buckets.fail.start != -1) horizon_result.pushKV("fail", failbucket);
# # # # ]
203 : 0 : } else {
204 : : // Output only information that is still meaningful in the event of error
205 [ # # # # : 0 : horizon_result.pushKV("decay", buckets.decay);
# # ]
206 [ # # # # : 0 : horizon_result.pushKV("scale", (int)buckets.scale);
# # ]
207 [ # # # # : 0 : horizon_result.pushKV("fail", failbucket);
# # ]
208 [ # # # # ]: 0 : errors.push_back("Insufficient data or no feerate found which meets threshold");
209 [ # # # # : 0 : horizon_result.pushKV("errors", errors);
# # ]
210 : : }
211 [ # # # # : 0 : result.pushKV(StringForFeeEstimateHorizon(horizon), horizon_result);
# # ]
212 : 0 : }
213 : 0 : return result;
214 [ # # ]: 0 : },
215 : : };
216 : 0 : }
217 : :
218 : 1 : void RegisterFeeRPCCommands(CRPCTable& t)
219 : : {
220 [ + - - + : 3 : static const CRPCCommand commands[]{
# # ]
221 [ + - + - ]: 1 : {"util", &estimatesmartfee},
222 [ + - - + ]: 1 : {"hidden", &estimaterawfee},
223 : : };
224 [ + + ]: 3 : for (const auto& c : commands) {
225 : 2 : t.appendCommand(c.name, &c);
226 : : }
227 : 1 : }
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