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3d82ec5bdd
Adds an outpoint -> txid index, which can be used to find which transactions spent a given output. We use a composite key with 2 parts (suggested by @romanz): hash(spent outpoint) and tx position, with an empty value. To find the spending tx for a given outpoint, we do a prefix search (prefix being the hash of the provided outpoint), and for all keys that match this prefix we load the tx at the position specified in the key and return it, along with the block hash, if does spend the provided outpoint. To handle reorgs we just erase the keys computed from the removed block. This index is extremely useful for Lightning and more generally for layer-2 protocols that rely on chains of unpublished transactions. If enabled, this index will be used by `gettxspendingprevout` when it does not find a spending transaction in the mempool.
41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
// Copyright (c) 2021-present The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_NODE_CACHES_H
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#define BITCOIN_NODE_CACHES_H
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#include <kernel/caches.h>
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#include <util/byte_units.h>
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#include <cstddef>
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class ArgsManager;
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//! min. -dbcache (bytes)
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static constexpr size_t MIN_DB_CACHE{4_MiB};
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//! -dbcache default (bytes)
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static constexpr size_t DEFAULT_DB_CACHE{DEFAULT_KERNEL_CACHE};
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namespace node {
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struct IndexCacheSizes {
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size_t tx_index{0};
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size_t filter_index{0};
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size_t txospender_index{0};
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};
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struct CacheSizes {
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IndexCacheSizes index;
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kernel::CacheSizes kernel;
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};
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CacheSizes CalculateCacheSizes(const ArgsManager& args, size_t n_indexes = 0);
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constexpr bool ShouldWarnOversizedDbCache(size_t dbcache, size_t total_ram) noexcept
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{
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const size_t cap{(total_ram < 2048_MiB) ? DEFAULT_DB_CACHE : (total_ram / 100) * 75};
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return dbcache > cap;
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}
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void LogOversizedDbCache(const ArgsManager& args) noexcept;
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} // namespace node
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#endif // BITCOIN_NODE_CACHES_H
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