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wallet: cache descriptor ID to avoid repeated descriptor string creation

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Right now a wallet descriptor is converted to it's string representation
(via `Descriptor::ToString`) repeatedly at different instances:
- on finding a `DescriptorScriptPubKeyMan` for a given descriptor
  (`CWallet::GetDescriptorScriptPubKeyMan`, e.g. used by the
  `importdescriptors` RPC); the string representation is created once
  for each spkm in the wallet and at each iteration again for
  the searched descriptor (`DescriptorScriptPubKeyMan::HasWalletDescriptor`)
- whenever `DescriptorScriptPubKeyMan::GetID()` is called, e.g. in
  `TopUp` or any instances where a descriptor is written to the DB
  to determine the database key etc.

As there is no good reason to calculate a fixed descriptor's string/ID
more than once, add the ID as a field to `WalletDescriptor` and
calculate it immediately at initialization (or deserialization).
`HasWalletDescriptor` is changed to compare the spkm's and searched
descriptor's ID instead of the string to take use of that.

This speeds up the functional test `wallet_miniscript.py` by a factor of
5-6x on my machine (3m30.95s on master vs. 0m38.02s on PR). The recently
introduced "max-size TapMiniscript" test-case introduced a descriptor
that takes 2-3 seconds to create a string representation, so the
repeated calls to that were significantly hurting the performance.
This commit is contained in:
Sebastian Falbesoner 2023-11-05 23:01:32 +01:00
parent 953d302a24
commit f811a24421
2 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/wallet/scriptpubkeyman.cpp
View File

@ -2601,7 +2601,7 @@ std::unique_ptr<CKeyMetadata> DescriptorScriptPubKeyMan::GetMetadata(const CTxDe
uint256 DescriptorScriptPubKeyMan::GetID() const
{
LOCK(cs_desc_man);
return DescriptorID(*m_wallet_descriptor.descriptor);
return m_wallet_descriptor.id;
}
void DescriptorScriptPubKeyMan::SetCache(const DescriptorCache& cache)
@ -2655,7 +2655,7 @@ bool DescriptorScriptPubKeyMan::AddCryptedKey(const CKeyID& key_id, const CPubKe
bool DescriptorScriptPubKeyMan::HasWalletDescriptor(const WalletDescriptor& desc) const
{
LOCK(cs_desc_man);
return m_wallet_descriptor.descriptor != nullptr && desc.descriptor != nullptr && m_wallet_descriptor.descriptor->ToString() == desc.descriptor->ToString();
return !m_wallet_descriptor.id.IsNull() && !desc.id.IsNull() && m_wallet_descriptor.id == desc.id;
}
void DescriptorScriptPubKeyMan::WriteDescriptor()

4
src/wallet/walletutil.h
View File

@ -85,6 +85,7 @@ class WalletDescriptor
{
public:
std::shared_ptr<Descriptor> descriptor;
uint256 id; // Descriptor ID (calculated once at descriptor initialization/deserialization)
uint64_t creation_time = 0;
int32_t range_start = 0; // First item in range; start of range, inclusive, i.e. [range_start, range_end). This never changes.
int32_t range_end = 0; // Item after the last; end of range, exclusive, i.e. [range_start, range_end). This will increment with each TopUp()
@ -99,6 +100,7 @@ public:
if (!descriptor) {
throw std::ios_base::failure("Invalid descriptor: " + error);
}
id = DescriptorID(*descriptor);
}
SERIALIZE_METHODS(WalletDescriptor, obj)
@ -110,7 +112,7 @@ public:
}
WalletDescriptor() {}
WalletDescriptor(std::shared_ptr<Descriptor> descriptor, uint64_t creation_time, int32_t range_start, int32_t range_end, int32_t next_index) : descriptor(descriptor), creation_time(creation_time), range_start(range_start), range_end(range_end), next_index(next_index) {}
WalletDescriptor(std::shared_ptr<Descriptor> descriptor, uint64_t creation_time, int32_t range_start, int32_t range_end, int32_t next_index) : descriptor(descriptor), id(DescriptorID(*descriptor)), creation_time(creation_time), range_start(range_start), range_end(range_end), next_index(next_index) { }
};
} // namespace wallet