wallet2_api: getter and setter for "refresh interval"

src/wallet/api/wallet.cpp

@@ -428,6 +428,16 @@ void WalletImpl::refreshAsync()
     m_refreshCV.notify_one();
 }
 
+void WalletImpl::setAutoRefreshInterval(int seconds)
+{
+    m_refreshIntervalSeconds = seconds;
+}
+
+int WalletImpl::autoRefreshInterval() const
+{
+    return m_refreshIntervalSeconds;
+}
+
 // TODO:
 // 1 - properly handle payment id (add another menthod with explicit 'payment_id' param)
 // 2 - check / design how "Transaction" can be single interface
@@ -640,7 +650,15 @@ void WalletImpl::refreshThreadFunc()
             break;
         }
         LOG_PRINT_L3(__FUNCTION__ << ": waiting for refresh...");
-        m_refreshCV.wait(lock);
+        // if auto refresh enabled, we wait for the "m_refreshIntervalSeconds" interval.
+        // if not - we wait forever
+        if (m_refreshIntervalSeconds > 0) {
+            boost::posix_time::milliseconds wait_for_ms(m_refreshIntervalSeconds * 1000);
+            m_refreshCV.timed_wait(lock, wait_for_ms);
+        } else {
+            m_refreshCV.wait(lock);
+        }
+
         LOG_PRINT_L3(__FUNCTION__ << ": refresh lock acquired...");
         LOG_PRINT_L3(__FUNCTION__ << ": m_refreshEnabled: " << m_refreshEnabled);
         LOG_PRINT_L3(__FUNCTION__ << ": m_status: " << m_status);

src/wallet/api/wallet.h

@@ -77,6 +77,11 @@ public:
     uint64_t unlockedBalance() const;
     bool refresh();
     void refreshAsync();
+    void setAutoRefreshInterval(int seconds);
+    int autoRefreshInterval() const;
+
+
+
     PendingTransaction * createTransaction(const std::string &dst_addr, const std::string &payment_id,
                                         uint64_t amount, uint32_t mixin_count,
                                         PendingTransaction::Priority priority = PendingTransaction::Priority_Low);

src/wallet/wallet2_api.h

@@ -223,10 +223,25 @@ struct Wallet
      * @return - true if refreshed successfully;
      */
     virtual bool refresh() = 0;
+
     /**
      * @brief refreshAsync - refreshes wallet asynchronously.
      */
     virtual void refreshAsync() = 0;
+
+    /**
+     * @brief setAutoRefreshInterval - setup interval for automatic refresh.
+     * @param seconds - interval in seconds. if zero or less than zero - automatic refresh disabled;
+     */
+    virtual void setAutoRefreshInterval(int seconds) = 0;
+
+    /**
+     * @brief autoRefreshInterval - returns automatic refresh interval in seconds
+     * @return
+     */
+    virtual int autoRefreshInterval() const = 0;
+
+
     /*!
      * \brief createTransaction creates transaction. if dst_addr is an integrated address, payment_id is ignored
      * \param dst_addr          destination address as string