scanning code change, should improve performance and correctness but may make post scans slower

control.lua

@@ -29,21 +29,19 @@ function Aux.control.event_listener(event, action)
 	
 	local listener = { event=event, action=action }
 	
-	function self.set_action(action)
+	function self:set_action(action)
 		listener.action = action
 	end
 	
-	function self.start()
+	function self:start()
 		Aux.util.set_add(event_listeners, listener)
-		if not Aux.util.any(event_listeners, function(l) return l.event == event end) then
-			AuxControlFrame:RegisterEvent(event)
-		end
+		AuxControlFrame:RegisterEvent(event)
 		return self
 	end
 	
-	function self.stop()
+	function self:stop()
 		listener.deleted = true
-		if not Aux.util.any(event_listeners, function(l) return l.event == event end) then
+		if not Aux.util.any(Aux.util.set_to_array(event_listeners), function(l) return l.event == event end) then
 			AuxControlFrame:UnregisterEvent(event)
 		end
 		return self
@@ -57,16 +55,16 @@ function Aux.control.update_listener(action)
 	
 	local listener = { action=action }
 
-	function self.set_action(action)
+	function self:set_action(action)
 		listener.action = action
 	end
 	
-	function self.start()
+	function self:start()
 		Aux.util.set_add(update_listeners, listener)
 		return self
 	end
 	
-	function self.stop()
+	function self:stop()
 		listener.deleted = true
 		return self
 	end
@@ -79,36 +77,36 @@ end
 function Aux.control.on_next_update(callback)
 	local listener = Aux.control.update_listener()
 	
-	listener.set_action(function()
+	listener:set_action(function()
 		listener:stop()
 		return callback()
 	end)
 	
-	listener.start()
+	listener:start()
 end
 
 function Aux.control.on_next_event(event, callback)
 	local listener = Aux.control.event_listener(event)
 	
-	listener.set_action(function()
+	listener:set_action(function()
 		listener:stop()
 		return callback()
 	end)
 	
-	listener.start()
+	listener:start()
 end
 
 function Aux.control.as_soon_as(p, callback)
 	local listener = Aux.control.update_listener()	
 	
-	listener.set_action(function()
+	listener:set_action(function()
 		if p() then
-			listener.stop()
+			listener:stop()
 			return callback()
 		end
 	end)
 	
-	listener.start()
+	listener:start()
 end
 
 
@@ -119,14 +117,14 @@ function Aux.control.controller()
 	local state
 	
 	local listener = Aux.control.update_listener()
-	listener.set_action(function()
+	listener:set_action(function()
 		if state and state.p() then
 			local k = state.k
 			state = nil
 			return k()
 		end
 	end)
-	listener.start()
+	listener:start()
 	
 	function self.wait(p, k)
 		state = {
@@ -135,11 +133,11 @@ function Aux.control.controller()
 		}
 	end
 	
-	function self.reset()
+	function self:reset()
 		state = nil
 	end
 	
-	function self.cleanup()
+	function self:cleanup()
 		listener.stop()
 	end
 	

post_frame.lua

@@ -778,7 +778,6 @@ function private.refresh_entries()
         private.status_bar:set_text('Scanning auctions...')
 
 		Aux.scan.start{
-            no_wait_owners = true,
 			queries = { query },
 			on_page_loaded = function(page, total_pages)
                 private.status_bar:update_status(100 * (page + 1) / total_pages, 0) -- TODO

scan.lua

@@ -71,32 +71,39 @@ function wait_for_results(k)
             end)
         end
     else
-        Aux.control.on_next_event('AUCTION_ITEM_LIST_UPDATE', function()
+        local last_update
+        local listener = Aux.control.event_listener('AUCTION_ITEM_LIST_UPDATE')
+        listener:set_action(function()
+            private.request_owner_data()
+            last_update = GetTime()
+        end)
+        listener:start()
+        Aux.control.as_soon_as(function() return last_update and GetTime() - last_update > 3 end, function()
+            listener:stop()
             ok = true
         end)
     end
 
-	return controller().wait(function() return ok end, k)
+    local t0 = GetTime()
+	return controller().wait(function() return ok or GetTime() - t0 > 30 end, k)
 end
 
-function wait_for_owner_data(k)
-    if state.params.no_wait_owners then
-        return k()
+function private.owner_data_complete()
+    local count, _ = GetNumAuctionItems(current_query().type)
+    for i=1,count do
+        local auction_info = Aux.info.auction(i, current_query().type)
+        if auction_info and not auction_info.owner then
+            return false
+        end
+    end
+    return true
+end
+
+function private.request_owner_data()
+    local count, _ = GetNumAuctionItems(current_query().type)
+    for i=1,count do
+        Aux.info.auction(i, current_query().type)
     end
-	local t0 = time()
-	return controller().wait(function()
-		if time() - t0 > 30 then -- we won't wait longer than 30 seconds
-			return true
-		end
-		local count, _ = GetNumAuctionItems(current_query().type)
-		for i=1,count do
-			local auction_info = Aux.info.auction(i, current_query().type)
-			if auction_info and not auction_info.owner then
-				return false
-			end
-		end
-		return true
-	end, k)
 end
 
 function wait_for_callback(args) -- the arguments must not be nil!
@@ -202,17 +209,15 @@ function submit_query(k)
                 state.params.on_submit_query()
             end
             wait_for_results(function()
-                wait_for_owner_data(function()
-                    local _, total_count = GetNumAuctionItems(current_query().type)
-                    state.total_pages = math.ceil(total_count / PAGE_SIZE)
-                    if state.total_pages >= state.page + 1 then
-                        wait_for_callback{state.params.on_page_loaded or Aux.util.pass, state.page, state.total_pages, function()
-                            return k()
-                        end}
-                    else
+                local _, total_count = GetNumAuctionItems(current_query().type)
+                state.total_pages = math.ceil(total_count / PAGE_SIZE)
+                if state.total_pages >= state.page + 1 then
+                    wait_for_callback{state.params.on_page_loaded or Aux.util.pass, state.page, state.total_pages, function()
                         return k()
-                    end
-                end)
+                    end}
+                else
+                    return k()
+                end
             end)
             if current_query().type == 'bidder' then
                 GetBidderAuctionItems(state.page)