etc/config: Remove log functions

etc/config/config.docker

@@ -6,6 +6,8 @@ print('Knot Resolver ' .. package_version())
 -- Smaller cache size
 cache.size = 10 * MB
 
+local ffi = require('ffi')
+
 function interactive_mode()
 	-- Listen on all interfaces (localhost would not work in Docker)
 	net.listen('0.0.0.0', 53, { kind = 'dns' })
@@ -62,7 +64,7 @@ function debug_mode(qname, qtype)
 		-- ultra verbose log
 		verbose(true)
 		policy.add(policy.all(policy.DEBUG_ALWAYS))
-		log('INFO: starting DNS query for %s %s', qname, kres.tostring.type[qtype])
+		log_debug(ffi.C.LOG_GRP_RESOLVER, 'starting DNS query for %s %s', qname, kres.tostring.type[qtype])
 		local starttime = cqueues.monotime()
 		resolve({
 			name = qname,
@@ -74,7 +76,7 @@ function debug_mode(qname, qtype)
 				event.after(1, -- milisecond
 					function()
 						local endtime = cqueues.monotime()
-						log('\nrequest finished in %f ms', (endtime - starttime) * 1000)
+						log_debug(ffi.C.LOG_GRP_RESOLVER, '\nrequest finished in %f ms', (endtime - starttime) * 1000)
 						os.exit()
 					end)
 				end
@@ -87,7 +89,7 @@ local qtype = os.getenv('QTYPE')
 if qname and qtype then
 	qtypenum = kres.type[qtype]
 	if not qtypenum then
-		log('ERROR: unsupported query type "%s", use TYPE12345 notation', qtype)
+		log_error(ffi.C.LOG_GRP_RESOLVER, 'ERROR: unsupported query type "%s", use TYPE12345 notation', qtype)
 		os.exit()
 	end
 	debug_mode(qname, qtypenum)

etc/config/config.isp

@@ -20,9 +20,11 @@ modules = {
     'stats'
 }
 
+local ffi = require('ffi')
+
 -- log statistics every second
 local stat_id = event.recurrent(1 * second, function(evid)
-    log(table_print(stats.list()))
+    log_info(ffi.C.LOG_GRP_STATISTICS, table_print(stats.list()))
 end)
 
 -- stop printing statistics after first minute
@@ -42,7 +44,7 @@ function speed_monitor()
                 local slow_increment = now['answer.slow'] - previous['answer.slow']
                 -- if percentage of slow answers is bigger than 5%, print warning
                 if slow_increment / total_increment > 0.05 then
-                        log('WARNING! More than 5 %% of queries was slow!')
+                        log_warn(ffi.C.LOG_GRP_STATISTICS, 'WARNING! More than 5 %% of queries was slow!')
                 end
                 previous = now
          end