Don't timeout a slow operation that's making progress

If we got at least MIN_BYTES_WANTED (default 512) during any network
poll, reset the timeout to allow more time for data to arrive.

contrib/epee/include/net/levin_protocol_handler_async.h

@@ -42,6 +42,10 @@
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "net"
 
+#ifndef MIN_BYTES_WANTED
+#define MIN_BYTES_WANTED	512
+#endif
+
 namespace epee
 {
 namespace levin
@@ -139,26 +143,23 @@ public:
     virtual bool is_timer_started() const=0;
     virtual void cancel()=0;
     virtual bool cancel_timer()=0;
+    virtual void reset_timer()=0;
+    virtual void timeout_handler(const boost::system::error_code& error)=0;
   };
   template <class callback_t>
   struct anvoke_handler: invoke_response_handler_base
   {
     anvoke_handler(const callback_t& cb, uint64_t timeout,  async_protocol_handler& con, int command)
-      :m_cb(cb), m_con(con), m_timer(con.m_pservice_endpoint->get_io_service()), m_timer_started(false),
+      :m_cb(cb), m_timeout(timeout), m_con(con), m_timer(con.m_pservice_endpoint->get_io_service()), m_timer_started(false),
       m_cancel_timer_called(false), m_timer_cancelled(false), m_command(command)
     {
       if(m_con.start_outer_call())
       {
+        MDEBUG(con.get_context_ref() << "anvoke_handler, timeout: " << timeout);
         m_timer.expires_from_now(boost::posix_time::milliseconds(timeout));
-        m_timer.async_wait([&con, command, cb](const boost::system::error_code& ec)
+        m_timer.async_wait([this](const boost::system::error_code& ec)
         {
-          if(ec == boost::asio::error::operation_aborted)
+          timeout_handler(ec);
-            return;
-          MINFO(con.get_context_ref() << "Timeout on invoke operation happened, command: " << command);
-          std::string fake;
-          cb(LEVIN_ERROR_CONNECTION_TIMEDOUT, fake, con.get_context_ref());
-          con.close();
-          con.finish_outer_call();
         });
         m_timer_started = true;
       }
@@ -171,7 +172,18 @@ public:
     bool m_timer_started;
     bool m_cancel_timer_called;
     bool m_timer_cancelled;
+    uint64_t m_timeout;
     int m_command;
+    virtual void timeout_handler(const boost::system::error_code& error)
+    {
+      if(error == boost::asio::error::operation_aborted)
+        return;
+      MINFO(m_con.get_context_ref() << "Timeout on invoke operation happened, command: " << m_command << " timeout: " << m_timeout);
+      std::string fake;
+      m_cb(LEVIN_ERROR_CONNECTION_TIMEDOUT, fake, m_con.get_context_ref());
+      m_con.close();
+      m_con.finish_outer_call();
+    }
     virtual bool handle(int res, const std::string& buff, typename async_protocol_handler::connection_context& context)
     {
       if(!cancel_timer())
@@ -203,6 +215,18 @@ public:
       }
       return m_timer_cancelled;
     }
+    virtual void reset_timer()
+    {
+      boost::system::error_code ignored_ec;
+      if (!m_cancel_timer_called && m_timer.cancel(ignored_ec) > 0)
+      {
+        m_timer.expires_from_now(boost::posix_time::milliseconds(m_timeout));
+        m_timer.async_wait([this](const boost::system::error_code& ec)
+        {
+          timeout_handler(ec);
+        });
+      }
+    }
   };
   critical_section m_invoke_response_handlers_lock;
   std::list<boost::shared_ptr<invoke_response_handler_base> > m_invoke_response_handlers;
@@ -342,6 +366,13 @@ public:
         if(m_cache_in_buffer.size() < m_current_head.m_cb)
         {
           is_continue = false;
+          if(cb >= MIN_BYTES_WANTED && !m_invoke_response_handlers.empty())
+          {
+            //async call scenario
+            boost::shared_ptr<invoke_response_handler_base> response_handler = m_invoke_response_handlers.front();
+            response_handler->reset_timer();
+            MDEBUG(m_connection_context << "LEVIN_PACKET partial msg received. len=" << cb);
+          }
           break;
         }
         {
@@ -595,9 +626,15 @@ public:
                             << ", ver=" << head.m_protocol_version);
 
     uint64_t ticks_start = misc_utils::get_tick_count();
+    size_t prev_size = 0;
 
     while(!boost::interprocess::ipcdetail::atomic_read32(&m_invoke_buf_ready) && !m_deletion_initiated && !m_protocol_released)
     {
+      if(m_cache_in_buffer.size() - prev_size >= MIN_BYTES_WANTED)
+      {
+        prev_size = m_cache_in_buffer.size();
+        ticks_start = misc_utils::get_tick_count();
+      }
       if(misc_utils::get_tick_count() - ticks_start > m_config.m_invoke_timeout)
       {
         MWARNING(m_connection_context << "invoke timeout (" << m_config.m_invoke_timeout << "), closing connection ");