2 files changed, 77 insertions, 33 deletions

diff --git a/src/wallet/bdb.cpp b/src/wallet/bdb.cpp
index 7ed9c88122..125bf004e4 100644
--- a/src/wallet/bdb.cpp
+++ b/src/wallet/bdb.cpp
@@ -803,3 +803,67 @@ std::string BerkeleyDatabaseVersion()
 {
     return DbEnv::version(nullptr, nullptr, nullptr);
 }
+
+bool BerkeleyBatch::ReadKey(CDataStream& key, CDataStream& value)
+{
+    if (!pdb)
+        return false;
+
+    // Key
+    SafeDbt datKey(key.data(), key.size());
+
+    // Read
+    SafeDbt datValue;
+    int ret = pdb->get(activeTxn, datKey, datValue, 0);
+    if (ret == 0 && datValue.get_data() != nullptr) {
+        value.write((char*)datValue.get_data(), datValue.get_size());
+        return true;
+    }
+    return false;
+}
+
+bool BerkeleyBatch::WriteKey(CDataStream& key, CDataStream& value, bool overwrite)
+{
+    if (!pdb)
+        return true;
+    if (fReadOnly)
+        assert(!"Write called on database in read-only mode");
+
+    // Key
+    SafeDbt datKey(key.data(), key.size());
+
+    // Value
+    SafeDbt datValue(value.data(), value.size());
+
+    // Write
+    int ret = pdb->put(activeTxn, datKey, datValue, (overwrite ? 0 : DB_NOOVERWRITE));
+    return (ret == 0);
+}
+
+bool BerkeleyBatch::EraseKey(CDataStream& key)
+{
+    if (!pdb)
+        return false;
+    if (fReadOnly)
+        assert(!"Erase called on database in read-only mode");
+
+    // Key
+    SafeDbt datKey(key.data(), key.size());
+
+    // Erase
+    int ret = pdb->del(activeTxn, datKey, 0);
+    return (ret == 0 || ret == DB_NOTFOUND);
+}
+
+bool BerkeleyBatch::HasKey(CDataStream& key)
+{
+    if (!pdb)
+        return false;
+
+    // Key
+    SafeDbt datKey(key.data(), key.size());
+
+    // Exists
+    int ret = pdb->exists(activeTxn, datKey, 0);
+    return ret == 0;
+}
diff --git a/src/wallet/bdb.h b/src/wallet/bdb.h
index 5ed364344b..1e717b95be 100644
--- a/src/wallet/bdb.h
+++ b/src/wallet/bdb.h
@@ -207,6 +207,12 @@ class BerkeleyBatch
         operator Dbt*();
     };
 
+private:
+    bool ReadKey(CDataStream& key, CDataStream& value);
+    bool WriteKey(CDataStream& key, CDataStream& value, bool overwrite=true);
+    bool EraseKey(CDataStream& key);
+    bool HasKey(CDataStream& key);
+
 protected:
     Db* pdb;
     std::string strFile;
@@ -236,91 +242,65 @@ public:
     template <typename K, typename T>
     bool Read(const K& key, T& value)
     {
-        if (!pdb)
-            return false;
-
         // Key
         CDataStream ssKey(SER_DISK, CLIENT_VERSION);
         ssKey.reserve(1000);
         ssKey << key;
-        SafeDbt datKey(ssKey.data(), ssKey.size());
 
-        // Read
-        SafeDbt datValue;
-        int ret = pdb->get(activeTxn, datKey, datValue, 0);
+        CDataStream ssValue(SER_DISK, CLIENT_VERSION);
         bool success = false;
-        if (datValue.get_data() != nullptr) {
+        bool ret = ReadKey(ssKey, ssValue);
+        if (ret) {
             // Unserialize value
             try {
-                CDataStream ssValue((char*)datValue.get_data(), (char*)datValue.get_data() + datValue.get_size(), SER_DISK, CLIENT_VERSION);
                 ssValue >> value;
                 success = true;
             } catch (const std::exception&) {
                 // In this case success remains 'false'
             }
         }
-        return ret == 0 && success;
+        return ret && success;
     }
 
     template <typename K, typename T>
     bool Write(const K& key, const T& value, bool fOverwrite = true)
     {
-        if (!pdb)
-            return true;
-        if (fReadOnly)
-            assert(!"Write called on database in read-only mode");
-
         // Key
         CDataStream ssKey(SER_DISK, CLIENT_VERSION);
         ssKey.reserve(1000);
         ssKey << key;
-        SafeDbt datKey(ssKey.data(), ssKey.size());
 
         // Value
         CDataStream ssValue(SER_DISK, CLIENT_VERSION);
         ssValue.reserve(10000);
         ssValue << value;
-        SafeDbt datValue(ssValue.data(), ssValue.size());
 
         // Write
-        int ret = pdb->put(activeTxn, datKey, datValue, (fOverwrite ? 0 : DB_NOOVERWRITE));
-        return (ret == 0);
+        return WriteKey(ssKey, ssValue, fOverwrite);
     }
 
     template <typename K>
     bool Erase(const K& key)
     {
-        if (!pdb)
-            return false;
-        if (fReadOnly)
-            assert(!"Erase called on database in read-only mode");
-
         // Key
         CDataStream ssKey(SER_DISK, CLIENT_VERSION);
         ssKey.reserve(1000);
         ssKey << key;
-        SafeDbt datKey(ssKey.data(), ssKey.size());
 
         // Erase
-        int ret = pdb->del(activeTxn, datKey, 0);
-        return (ret == 0 || ret == DB_NOTFOUND);
+        return EraseKey(ssKey);
     }
 
     template <typename K>
     bool Exists(const K& key)
     {
-        if (!pdb)
-            return false;
-
         // Key
         CDataStream ssKey(SER_DISK, CLIENT_VERSION);
         ssKey.reserve(1000);
         ssKey << key;
-        SafeDbt datKey(ssKey.data(), ssKey.size());
 
         // Exists
-        int ret = pdb->exists(activeTxn, datKey, 0);
-        return (ret == 0);
+        return HasKey(ssKey);
     }
 
     Dbc* GetCursor();