Merge bitcoin/bitcoin#28799: wallet: cache descriptor ID to avoid repeated descriptor string creation

5e6bc6d test: remove custom rpc timeout for `wallet_miniscript.py`, reorder in test_runner (Sebastian Falbesoner)
f811a24 wallet: cache descriptor ID to avoid repeated descriptor string creation (Sebastian Falbesoner)

Pull request description:

  Right now a wallet descriptor is converted to its 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, also at less obvious places like `FastWalletRescanFilter` 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.

  Fixes bitcoin/bitcoin#28800.

ACKs for top commit:
  Sjors:
    ACK 5e6bc6d
  S3RK:
    Code Review ACK 5e6bc6d
  achow101:
    ACK 5e6bc6d
  BrandonOdiwuor:
    ACK 5e6bc6d

Tree-SHA512: 98b43963a5dde6055bb26cecd3b878dadd837d6226af4c84142383310495da80b3c4bd552e73b9107f2f2ff1c11f5e18060c6fd3d9e44bbd5224114c4d245c1c

Author: achow101

src/wallet/scriptpubkeyman.cpp

@@ -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()

src/wallet/walletutil.h

@@ -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 @@ class WalletDescriptor
         if (!descriptor) {
             throw std::ios_base::failure("Invalid descriptor: " + error);
         }
+        id = DescriptorID(*descriptor);
     }
 
     SERIALIZE_METHODS(WalletDescriptor, obj)
@@ -110,7 +112,7 @@ class WalletDescriptor
     }
 
     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
 

test/functional/test_runner.py

@@ -105,7 +105,6 @@
     'feature_maxuploadtarget.py',
     'mempool_updatefromblock.py',
     'mempool_persist.py --descriptors',
-    'wallet_miniscript.py --descriptors',
     # vv Tests less than 60s vv
     'rpc_psbt.py --legacy-wallet',
     'rpc_psbt.py --descriptors',
@@ -149,6 +148,7 @@
     'p2p_sendheaders.py',
     'wallet_listtransactions.py --legacy-wallet',
     'wallet_listtransactions.py --descriptors',
+    'wallet_miniscript.py --descriptors',
     # vv Tests less than 30s vv
     'p2p_invalid_messages.py',
     'rpc_createmultisig.py',

test/functional/wallet_miniscript.py

@@ -205,7 +205,6 @@
 class WalletMiniscriptTest(BitcoinTestFramework):
     def add_options(self, parser):
         self.add_wallet_options(parser, legacy=False)
-        self.rpc_timeout = 480
 
     def set_test_params(self):
         self.num_nodes = 1