Revert "[Fix] Fix empty prefilters that require mime structures"

This reverts commit c3c8d4d133.

src/plugins/lua/asn.lua

 if configure_asn_module() then
   local id = rspamd_config:register_symbol({
     name = 'ASN_CHECK',
-    type = 'prefilter,nostat,empty',
+    type = 'prefilter,nostat',
     callback = asn_check,
     priority = 8,
+    flags = 'empty',
   })
   if options['symbol'] then
     rspamd_config:register_symbol({

src/plugins/lua/ratelimit.lua

     ['get_value'] = function(task)
       return task:get_principal_recipient()
     end,
-    need_process = true,
   },
   ['digest'] = {
     ['get_value'] = function(task)
       return task:get_digest()
     end,
-    need_process = true,
   },
   ['attachments'] = {
     ['get_value'] = function(task)
 
       return nil
     end,
-    need_process = true,
   },
   ['files'] = {
     ['get_value'] = function(task)
 
       return nil
     end,
-    need_process = true,
   },
 }
 
   local key_t = {tostring(lua_util.round(100000.0 / bucket.burst))}
   local key_keywords = lua_util.str_split(rtype, '_')
   local have_user = false
-  local message_processed = false
 
   for _, v in ipairs(key_keywords) do
     local ret
+
     if keywords[v] and type(keywords[v]['get_value']) == 'function' then
-      if keywords[v].need_process and not message_processed then
-        lua_util.debugm(N, task, 'process message as %s needs mime elts',
-            v)
-        message_processed = task:process_message()
-        message_processed = true
-      end
-      ret = keywords[v].get_value(task)
+      ret = keywords[v]['get_value'](task)
     end
     if not ret then return nil end
     if v == 'user' then have_user = true end
   local n = 0
   for _,bucket in ipairs(v.buckets) do
     if v.selector then
-      lua_util.debugm(N, task, 'process message as selectors need mime elts',
-          v)
-      task:process_message()
       local selectors = lua_selectors.process_selectors(task, v.selector)
       if selectors then
         local combined = lua_selectors.combine_selectors(task, selectors, ':')
     lua_util.disable_module(N, "redis")
   else
     local s = {
-      type = 'prefilter,nostat,empty',
+      type = 'prefilter,nostat',
       name = 'RATELIMIT_CHECK',
       priority = 7,
       callback = ratelimit_cb,
+      flags = 'empty',
     }
 
     if settings.symbol then

src/plugins/lua/settings.lua

 
 -- Check limit for a task
 local function check_settings(task)
-  local message_processed = false
   local function check_specific_setting(rule, matched)
     local res = false
 
       local elt = rule.checks[atom]
 
       if elt then
-        if elt.need_process and not message_processed then
-          lua_util.debugm(N, task, 'process message as %s needs mime elts',
-              atom)
-          message_processed = task:process_message()
-          message_processed = true
-        end
-
         local input = elt.extract(task)
         if not input then return false end
 
           extract = function(task)
             return task:get_from(2)
           end,
-          need_process = true,
         }
       end
     end
           extract = function(task)
             return task:get_recipients(2)
           end,
-          need_process = true,
         }
       end
     end
                 return v
               end,
               extract = extractor_func(k),
-              need_process = true,
             }
 
             local skey = process_compound_condition(cond, table_element,
             end, values)
           end,
           extract = sel,
-          need_process = true,
         }
         local skey = process_compound_condition(cond, 'selector', elt.selector)
         lua_util.debugm(N, rspamd_config, 'added selector condition to "%s": %s',

src/plugins/lua/whitelist.lua

           return
         end
 
-        local flags
-        if not rule['blacklist'] then
-          flags = 'nice'
+        local flags = 'nice,empty'
+        if rule['blacklist'] then
+          flags = 'empty'
         end
 
         local id = rspamd_config:register_symbol({