diff options
| -rw-r--r-- | src/wallet/wallet.cpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp index 671c432b10..e77648f7ff 100644 --- a/src/wallet/wallet.cpp +++ b/src/wallet/wallet.cpp @@ -5,6 +5,7 @@ #include <wallet/wallet.h> +#include <blockfilter.h> #include <chain.h> #include <consensus/amount.h> #include <consensus/consensus.h> @@ -261,6 +262,64 @@ std::shared_ptr<CWallet> LoadWalletInternal(WalletContext& context, const std::s return nullptr; } } + +class FastWalletRescanFilter +{ +public: + FastWalletRescanFilter(const CWallet& wallet) : m_wallet(wallet) + { + // fast rescanning via block filters is only supported by descriptor wallets right now + assert(!m_wallet.IsLegacy()); + + // create initial filter with scripts from all ScriptPubKeyMans + for (auto spkm : m_wallet.GetAllScriptPubKeyMans()) { + auto desc_spkm{dynamic_cast<DescriptorScriptPubKeyMan*>(spkm)}; + assert(desc_spkm != nullptr); + AddScriptPubKeys(desc_spkm); + // save each range descriptor's end for possible future filter updates + if (desc_spkm->IsHDEnabled()) { + m_last_range_ends.emplace(desc_spkm->GetID(), desc_spkm->GetEndRange()); + } + } + } + + void UpdateIfNeeded() + { + // repopulate filter with new scripts if top-up has happened since last iteration + for (const auto& [desc_spkm_id, last_range_end] : m_last_range_ends) { + auto desc_spkm{dynamic_cast<DescriptorScriptPubKeyMan*>(m_wallet.GetScriptPubKeyMan(desc_spkm_id))}; + assert(desc_spkm != nullptr); + int32_t current_range_end{desc_spkm->GetEndRange()}; + if (current_range_end > last_range_end) { + AddScriptPubKeys(desc_spkm, last_range_end); + m_last_range_ends.at(desc_spkm->GetID()) = current_range_end; + } + } + } + + std::optional<bool> MatchesBlock(const uint256& block_hash) const + { + return m_wallet.chain().blockFilterMatchesAny(BlockFilterType::BASIC, block_hash, m_filter_set); + } + +private: + const CWallet& m_wallet; + /** Map for keeping track of each range descriptor's last seen end range. + * This information is used to detect whether new addresses were derived + * (that is, if the current end range is larger than the saved end range) + * after processing a block and hence a filter set update is needed to + * take possible keypool top-ups into account. + */ + std::map<uint256, int32_t> m_last_range_ends; + GCSFilter::ElementSet m_filter_set; + + void AddScriptPubKeys(const DescriptorScriptPubKeyMan* desc_spkm, int32_t last_range_end = 0) + { + for (const auto& script_pub_key : desc_spkm->GetScriptPubKeys(last_range_end)) { + m_filter_set.emplace(script_pub_key.begin(), script_pub_key.end()); + } + } +}; } // namespace std::shared_ptr<CWallet> LoadWallet(WalletContext& context, const std::string& name, std::optional<bool> load_on_start, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings) |