wallet_api: expose offline mode status

src/wallet/api/wallet.cpp

@@ -2392,6 +2392,11 @@ void WalletImpl::setOffline(bool offline)
     m_wallet->set_offline(offline);
 }
 
+bool WalletImpl::isOffline() const
+{
+    return m_wallet->is_offline();
+}
+
 void WalletImpl::hardForkInfo(uint8_t &version, uint64_t &earliest_height) const
 {
     m_wallet->get_hard_fork_info(version, earliest_height);

src/wallet/api/wallet.h

@@ -186,6 +186,7 @@ public:
     virtual std::string getCacheAttribute(const std::string &key) const override;
 
     virtual void setOffline(bool offline) override;
+    virtual bool isOffline() const override;
 
     virtual bool setUserNote(const std::string &txid, const std::string &note) override;
     virtual std::string getUserNote(const std::string &txid) const override;

src/wallet/api/wallet2_api.h

@@ -1034,6 +1034,7 @@ struct Wallet
     * \param offline - true/false
     */
     virtual void setOffline(bool offline) = 0;
+    virtual bool isOffline() const = 0;
     
     //! blackballs a set of outputs
     virtual bool blackballOutputs(const std::vector<std::string> &outputs, bool add) = 0;