Add facility to store wallet flags (64 bits)

src/wallet/wallet.cpp

@@ -1526,6 +1526,28 @@ bool CWallet::IsHDEnabled() const
     return !hdChain.seed_id.IsNull();
 }
 
+void CWallet::SetWalletFlag(uint64_t flags)
+{
+    LOCK(cs_wallet);
+    m_wallet_flags |= flags;
+    if (!WalletBatch(*database).WriteWalletFlags(m_wallet_flags))
+        throw std::runtime_error(std::string(__func__) + ": writing wallet flags failed");
+}
+
+bool CWallet::IsWalletFlagSet(uint64_t flag)
+{
+    return (m_wallet_flags & flag);
+}
+
+void CWallet::SetWalletFlags(uint64_t overwriteFlags, bool memonly)
+{
+    LOCK(cs_wallet);
+    m_wallet_flags = overwriteFlags;
+    if (!memonly && !WalletBatch(*database).WriteWalletFlags(m_wallet_flags)) {
+        throw std::runtime_error(std::string(__func__) + ": writing wallet flags failed");
+    }
+}
+
 int64_t CWalletTx::GetTxTime() const
 {
     int64_t n = nTimeSmart;

src/wallet/wallet.h

@@ -723,6 +723,7 @@ private:
     std::set<int64_t> set_pre_split_keypool;
     int64_t m_max_keypool_index = 0;
     std::map<CKeyID, int64_t> m_pool_key_to_index;
+    std::atomic<uint64_t> m_wallet_flags{0};
 
     int64_t nTimeFirstKey = 0;
 
@@ -1190,6 +1191,15 @@ public:
 
     /** Whether a given output is spendable by this wallet */
     bool OutputEligibleForSpending(const COutput& output, const CoinEligibilityFilter& eligibility_filter) const;
+
+    /** set a single wallet flag */
+    void SetWalletFlag(uint64_t flags);
+
+    /** check if a certain wallet flag is set */
+    bool IsWalletFlagSet(uint64_t flag);
+
+    /** overwrite all flags by the given uint64_t */
+    void SetWalletFlags(uint64_t overwriteFlags, bool memOnly);
 };
 
 /** A key allocated from the key pool. */

src/wallet/walletdb.cpp

@@ -510,7 +510,11 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: SetHDChain failed";
                 return false;
             }
-        } else if (strType != "bestblock" && strType != "bestblock_nomerkle"){
+        } else if (strType == "flags") {
+            uint64_t flags;
+            ssValue >> flags;
+            pwallet->SetWalletFlags(flags, true);
+        } else if (strType != "bestblock" && strType != "bestblock_nomerkle") {
             wss.m_unknown_records++;
         }
     } catch (...)
@@ -840,6 +844,11 @@ bool WalletBatch::WriteHDChain(const CHDChain& chain)
     return WriteIC(std::string("hdchain"), chain);
 }
 
+bool WalletBatch::WriteWalletFlags(const uint64_t flags)
+{
+    return WriteIC(std::string("flags"), flags);
+}
+
 bool WalletBatch::TxnBegin()
 {
     return m_batch.TxnBegin();

src/wallet/walletdb.h

@@ -234,6 +234,7 @@ public:
     //! write the hdchain model (external chain child index counter)
     bool WriteHDChain(const CHDChain& chain);
 
+    bool WriteWalletFlags(const uint64_t flags);
     //! Begin a new transaction
     bool TxnBegin();
     //! Commit current transaction