Key pool: Change ReturnDestination interface to take address instead of key

In order for ScriptPubKeyMan to be generic and work with future
ScriptPubKeyMans, ScriptPubKeyMan::ReturnDestination is changed to
take a CTxDestination instead of a CPubKey. Since LegacyScriptPubKeyMan
still deals with keys internally, a new map m_reserved_key_to_index is
added in order to track the keypool indexes that have been reserved.

The CPubKey argument of KeepDestination is also  removed so that it is
more generic. Instead of taking a CPubKey or a CTxDestination, we just use
the nIndex given to find the pubkey.

1 files changed, 12 insertions, 4 deletions

diff --git a/src/wallet/scriptpubkeyman.cpp b/src/wallet/scriptpubkeyman.cpp
index 4986871fb7..e5b45a81a1 100644
--- a/src/wallet/scriptpubkeyman.cpp
+++ b/src/wallet/scriptpubkeyman.cpp
@@ -1087,16 +1087,20 @@ void LegacyScriptPubKeyMan::AddKeypoolPubkeyWithDB(const CPubKey& pubkey, const
     m_pool_key_to_index[pubkey.GetID()] = index;
 }
 
-void LegacyScriptPubKeyMan::KeepDestination(int64_t nIndex, const OutputType& type, const CPubKey& pubkey)
+void LegacyScriptPubKeyMan::KeepDestination(int64_t nIndex, const OutputType& type)
 {
     // Remove from key pool
     WalletBatch batch(m_storage.GetDatabase());
     batch.ErasePool(nIndex);
+    CPubKey pubkey;
+    bool have_pk = GetPubKey(m_index_to_reserved_key.at(nIndex), pubkey);
+    assert(have_pk);
     LearnRelatedScripts(pubkey, type);
+    m_index_to_reserved_key.erase(nIndex);
     WalletLogPrintf("keypool keep %d\n", nIndex);
 }
 
-void LegacyScriptPubKeyMan::ReturnDestination(int64_t nIndex, bool fInternal, const CPubKey& pubkey)
+void LegacyScriptPubKeyMan::ReturnDestination(int64_t nIndex, bool fInternal, const CTxDestination&)
 {
     // Return to key pool
     {
@@ -1108,7 +1112,9 @@ void LegacyScriptPubKeyMan::ReturnDestination(int64_t nIndex, bool fInternal, co
         } else {
             setExternalKeyPool.insert(nIndex);
         }
-        m_pool_key_to_index[pubkey.GetID()] = nIndex;
+        CKeyID& pubkey_id = m_index_to_reserved_key.at(nIndex);
+        m_pool_key_to_index[pubkey_id] = nIndex;
+        m_index_to_reserved_key.erase(nIndex);
         NotifyCanGetAddressesChanged();
     }
     WalletLogPrintf("keypool return %d\n", nIndex);
@@ -1130,7 +1136,7 @@ bool LegacyScriptPubKeyMan::GetKeyFromPool(CPubKey& result, const OutputType typ
             result = GenerateNewKey(batch, internal);
             return true;
         }
-        KeepDestination(nIndex, type, keypool.vchPubKey);
+        KeepDestination(nIndex, type);
         result = keypool.vchPubKey;
     }
     return true;
@@ -1175,6 +1181,8 @@ bool LegacyScriptPubKeyMan::ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& key
             throw std::runtime_error(std::string(__func__) + ": keypool entry invalid");
         }
 
+        assert(m_index_to_reserved_key.count(nIndex) == 0);
+        m_index_to_reserved_key[nIndex] = keypool.vchPubKey.GetID();
         m_pool_key_to_index.erase(keypool.vchPubKey.GetID());
         WalletLogPrintf("keypool reserve %d\n", nIndex);
     }