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Introduce DescriptorCache struct which caches xpubs

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This commit is contained in:
Andrew Chow 2020-02-24 15:09:15 -05:00
parent c3b4715923
commit 474ea3b927
2 changed files with 82 additions and 0 deletions
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39
src/script/descriptor.cpp
View File

@ -1050,3 +1050,42 @@ std::unique_ptr<Descriptor> InferDescriptor(const CScript& script, const Signing
{
return InferScript(script, ParseScriptContext::TOP, provider);
}
void DescriptorCache::CacheParentExtPubKey(uint32_t key_exp_pos, const CExtPubKey& xpub)
{
m_parent_xpubs[key_exp_pos] = xpub;
}
void DescriptorCache::CacheDerivedExtPubKey(uint32_t key_exp_pos, uint32_t der_index, const CExtPubKey& xpub)
{
auto& xpubs = m_derived_xpubs[key_exp_pos];
xpubs[der_index] = xpub;
}
bool DescriptorCache::GetCachedParentExtPubKey(uint32_t key_exp_pos, CExtPubKey& xpub) const
{
const auto& it = m_parent_xpubs.find(key_exp_pos);
if (it == m_parent_xpubs.end()) return false;
xpub = it->second;
return true;
}
bool DescriptorCache::GetCachedDerivedExtPubKey(uint32_t key_exp_pos, uint32_t der_index, CExtPubKey& xpub) const
{
const auto& key_exp_it = m_derived_xpubs.find(key_exp_pos);
if (key_exp_it == m_derived_xpubs.end()) return false;
const auto& der_it = key_exp_it->second.find(der_index);
if (der_it == key_exp_it->second.end()) return false;
xpub = der_it->second;
return true;
}
const ExtPubKeyMap DescriptorCache::GetCachedParentExtPubKeys() const
{
return m_parent_xpubs;
}
const std::unordered_map<uint32_t, ExtPubKeyMap> DescriptorCache::GetCachedDerivedExtPubKeys() const
{
return m_derived_xpubs;
}

43
src/script/descriptor.h
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@ -13,6 +13,49 @@
#include <vector>
using ExtPubKeyMap = std::unordered_map<uint32_t, CExtPubKey>;
/** Cache for single descriptor's derived extended pubkeys */
class DescriptorCache {
private:
/** Map key expression index -> map of (key derivation index -> xpub) */
std::unordered_map<uint32_t, ExtPubKeyMap> m_derived_xpubs;
/** Map key expression index -> parent xpub */
ExtPubKeyMap m_parent_xpubs;
public:
/** Cache a parent xpub
*
* @param[in] key_exp_pos Position of the key expression within the descriptor
* @param[in] xpub The CExtPubKey to cache
*/
void CacheParentExtPubKey(uint32_t key_exp_pos, const CExtPubKey& xpub);
/** Retrieve a cached parent xpub
*
* @param[in] key_exp_pos Position of the key expression within the descriptor
* @param[in] xpub The CExtPubKey to get from cache
*/
bool GetCachedParentExtPubKey(uint32_t key_exp_pos, CExtPubKey& xpub) const;
/** Cache an xpub derived at an index
*
* @param[in] key_exp_pos Position of the key expression within the descriptor
* @param[in] der_index Derivation index of the xpub
* @param[in] xpub The CExtPubKey to cache
*/
void CacheDerivedExtPubKey(uint32_t key_exp_pos, uint32_t der_index, const CExtPubKey& xpub);
/** Retrieve a cached xpub derived at an index
*
* @param[in] key_exp_pos Position of the key expression within the descriptor
* @param[in] der_index Derivation index of the xpub
* @param[in] xpub The CExtPubKey to get from cache
*/
bool GetCachedDerivedExtPubKey(uint32_t key_exp_pos, uint32_t der_index, CExtPubKey& xpub) const;
/** Retrieve all cached parent xpubs */
const ExtPubKeyMap GetCachedParentExtPubKeys() const;
/** Retrieve all cached derived xpubs */
const std::unordered_map<uint32_t, ExtPubKeyMap> GetCachedDerivedExtPubKeys() const;
};
/** \brief Interface for parsed descriptor objects.
*