[#493] node/config/logger: Simplify approach to read the level

Dedicated type `LoggerSection` turned out to be redundant since it doesn't
do a hidden logic and just uses `config.Config` API.

Remove `LoggerSection` type and implement `Level` which do the same.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-node/config/logger/config.go

@@ -4,27 +4,21 @@ import (
 	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
 )
 
-// LoggerSection represents config section
-// for logging component.
-type LoggerSection config.Config
-
 // config defaults
 const (
 	// LevelDefault is a default logger level
 	LevelDefault = "info"
 )
 
-// Init initializes LoggerSection from
+// Level returns value of "level" config parameter
-// "logger" subsection of config.
+// from "logger" section.
-func Init(root *config.Config) *LoggerSection {
-	return (*LoggerSection)(root.Sub("logger"))
-}
-
-// Level returns configuration value with name "level".
 //
 // Returns LevelDefault if value is not a non-empty string.
-func (x *LoggerSection) Level() string {
+func Level(c *config.Config) string {
-	v := config.StringSafe((*config.Config)(x), "level")
+	v := config.StringSafe(
+		c.Sub("logger"),
+		"level",
+	)
 	if v != "" {
 		return v
 	}

cmd/neofs-node/config/logger/config_test.go

@@ -12,20 +12,13 @@ import (
 )
 
 func TestLoggerSection_Level(t *testing.T) {
-	checkLevel := func(c *loggerconfig.LoggerSection, expected string) {
-		lvl := c.Level()
-		require.Equal(t, expected, lvl)
-	}
-
 	configtest.ForEachFileType("../../../../config/example/node", func(c *config.Config) {
-		cfg := loggerconfig.Init(c)
+		v := loggerconfig.Level(c)
-
+		require.Equal(t, "debug", v)
-		checkLevel(cfg, "debug")
 	})
 
-	empty := loggerconfig.Init(configtest.EmptyConfig())
+	v := loggerconfig.Level(configtest.EmptyConfig())
-
+	require.Equal(t, loggerconfig.LevelDefault, v)
-	checkLevel(empty, loggerconfig.LevelDefault)
 
 	t.Run("ENV", func(t *testing.T) {
 		// TODO: read from file
@@ -35,8 +28,7 @@ func TestLoggerSection_Level(t *testing.T) {
 		)
 		require.NoError(t, err)
 
-		empty = loggerconfig.Init(configtest.EmptyConfig())
+		v := loggerconfig.Level(configtest.EmptyConfig())
-
+		require.Equal(t, "debug", v)
-		checkLevel(empty, "debug")
 	})
 }