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author | MarcoFalke <falke.marco@gmail.com> | 2020-12-07 12:59:31 +0100 |
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committer | MarcoFalke <falke.marco@gmail.com> | 2020-12-07 12:59:48 +0100 |
commit | 03b1db6114958a9f8edf533f5280df4916d33665 (patch) | |
tree | 463500ff180d31903d8265dab06f0033031588f6 /src/policy | |
parent | 00f4dcd5520e14529b5c3fa8e14feb3a023ffb4c (diff) | |
parent | 4e28753f60613ecd35cdef87bef5f99c302c3fbd (diff) | |
download | bitcoin-03b1db6114958a9f8edf533f5280df4916d33665.tar.xz |
Merge #18766: Disable fee estimation in blocksonly mode (by removing the fee estimates global)
4e28753f60613ecd35cdef87bef5f99c302c3fbd feestimator: encapsulate estimation file logic (Antoine Poinsot)
e8ea6ad9c16997bdc7e22a20eca16e234290b7ff init: don't create a CBlockPolicyEstimator if we don't relay transactions (Antoine Poinsot)
86ff2cf202bfb9d9b50800b8ffe3fead3f77f5fa Remove the remaining fee estimation globals (Antoine Poinsot)
03bfeee957ab7e3b6aece82b9561774648094f54 interface: remove unused estimateSmartFee method from node (Antoine Poinsot)
Pull request description:
If the `blocksonly` mode is turned on after running with transaction
relay enabled for a while, the fee estimation will serve outdated data
to both the internal wallet and to external applications that might be
feerate-sensitive and make use of `estimatesmartfee` (for example a
Lightning Network node).
This has already caused issues (for example https://github.com/bitcoin/bitcoin/issues/16840 (C-lightning), or https://github.com/lightningnetwork/lnd/issues/2562 (LND)) and it seems prudent to fail rather than to give inaccurate values.
This fixes #16840, and closes #16890 which tried to fix the symptoms (RPC) but not the cause as mentioned by sdaftuar :
> If this is a substantial problem, then I would think we should take action to protect our own wallet users as well (rather than hide the results of what our fee estimation would do!).
ACKs for top commit:
MarcoFalke:
re-ACK 4e28753f60 👋
jnewbery:
utACK 4e28753f60613ecd35cdef87bef5f99c302c3fbd
Tree-SHA512: c869cf03b86d8194002970bbc84662dae76874967949b9be0d9a4511a1eabcb1627c38aca3154da9dcece1a4c49ec02bd4f9fcca2ec310986e07904559e63ba8
Diffstat (limited to 'src/policy')
-rw-r--r-- | src/policy/fees.cpp | 19 | ||||
-rw-r--r-- | src/policy/fees.h | 3 |
2 files changed, 22 insertions, 0 deletions
diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp index 0f31093dbb..f6e378866c 100644 --- a/src/policy/fees.cpp +++ b/src/policy/fees.cpp @@ -10,6 +10,8 @@ #include <txmempool.h> #include <util/system.h> +static const char* FEE_ESTIMATES_FILENAME="fee_estimates.dat"; + static constexpr double INF_FEERATE = 1e99; std::string StringForFeeEstimateHorizon(FeeEstimateHorizon horizon) { @@ -489,6 +491,7 @@ CBlockPolicyEstimator::CBlockPolicyEstimator() { static_assert(MIN_BUCKET_FEERATE > 0, "Min feerate must be nonzero"); size_t bucketIndex = 0; + for (double bucketBoundary = MIN_BUCKET_FEERATE; bucketBoundary <= MAX_BUCKET_FEERATE; bucketBoundary *= FEE_SPACING, bucketIndex++) { buckets.push_back(bucketBoundary); bucketMap[bucketBoundary] = bucketIndex; @@ -500,6 +503,13 @@ CBlockPolicyEstimator::CBlockPolicyEstimator() feeStats = std::unique_ptr<TxConfirmStats>(new TxConfirmStats(buckets, bucketMap, MED_BLOCK_PERIODS, MED_DECAY, MED_SCALE)); shortStats = std::unique_ptr<TxConfirmStats>(new TxConfirmStats(buckets, bucketMap, SHORT_BLOCK_PERIODS, SHORT_DECAY, SHORT_SCALE)); longStats = std::unique_ptr<TxConfirmStats>(new TxConfirmStats(buckets, bucketMap, LONG_BLOCK_PERIODS, LONG_DECAY, LONG_SCALE)); + + // If the fee estimation file is present, read recorded estimations + fs::path est_filepath = GetDataDir() / FEE_ESTIMATES_FILENAME; + CAutoFile est_file(fsbridge::fopen(est_filepath, "rb"), SER_DISK, CLIENT_VERSION); + if (est_file.IsNull() || !Read(est_file)) { + LogPrintf("Failed to read fee estimates from %s. Continue anyway.\n", est_filepath.string()); + } } CBlockPolicyEstimator::~CBlockPolicyEstimator() @@ -856,6 +866,15 @@ CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, FeeCalculation return CFeeRate(llround(median)); } +void CBlockPolicyEstimator::Flush() { + FlushUnconfirmed(); + + fs::path est_filepath = GetDataDir() / FEE_ESTIMATES_FILENAME; + CAutoFile est_file(fsbridge::fopen(est_filepath, "wb"), SER_DISK, CLIENT_VERSION); + if (est_file.IsNull() || !Write(est_file)) { + LogPrintf("Failed to write fee estimates to %s\n", est_filepath.string()); + } +} bool CBlockPolicyEstimator::Write(CAutoFile& fileout) const { diff --git a/src/policy/fees.h b/src/policy/fees.h index 8ea8816dc3..dd9f530c99 100644 --- a/src/policy/fees.h +++ b/src/policy/fees.h @@ -215,6 +215,9 @@ public: /** Calculation of highest target that estimates are tracked for */ unsigned int HighestTargetTracked(FeeEstimateHorizon horizon) const; + /** Drop still unconfirmed transactions and record current estimations, if the fee estimation file is present. */ + void Flush(); + private: mutable RecursiveMutex m_cs_fee_estimator; |