[#493] cmd/node: Support duration type casting in config

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

cmd/neofs-node/config/cast.go

@@ -1,6 +1,8 @@
 package config
 
 import (
+	"time"
+
 	"github.com/spf13/cast"
 )
 
@@ -47,3 +49,22 @@ func String(c *Config, name string) string {
 func StringSafe(c *Config, name string) string {
 	return cast.ToString(c.Value(name))
 }
+
+// Duration reads configuration value
+// from c by name and casts it to time.Duration.
+//
+// Panics if value can not be casted.
+func Duration(c *Config, name string) time.Duration {
+	x, err := cast.ToDurationE(c.Value(name))
+	panicOnErr(err)
+
+	return x
+}
+
+// DurationSafe reads configuration value
+// from c by name and casts it to time.Duration.
+//
+// Returns 0 if value can not be casted.
+func DurationSafe(c *Config, name string) time.Duration {
+	return cast.ToDuration(c.Value(name))
+}

cmd/neofs-node/config/cast_test.go

@@ -2,6 +2,7 @@ package config_test
 
 import (
 	"testing"
+	"time"
 
 	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
 	configtest "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/test"
@@ -45,3 +46,19 @@ func TestString(t *testing.T) {
 		require.Empty(t, val)
 	})
 }
+
+func TestDuration(t *testing.T) {
+	configtest.ForEachFileType("test/config", func(c *config.Config) {
+		c = c.Sub("duration")
+
+		val := config.Duration(c, "correct")
+		require.Equal(t, 15*time.Minute, val)
+
+		require.Panics(t, func() {
+			config.Duration(c, "incorrect")
+		})
+
+		val = config.DurationSafe(c, "incorrect")
+		require.Equal(t, time.Duration(0), val)
+	})
+}

cmd/neofs-node/config/test/config.json

@@ -14,5 +14,9 @@
   "string": {
     "correct": "some string",
     "incorrect": []
+  },
+  "duration": {
+    "correct": "15m",
+    "incorrect": "some string"
   }
 }

cmd/neofs-node/config/test/config.yaml

@@ -16,3 +16,7 @@ string:
   correct: some string
 
   incorrect: []
+
+duration:
+  correct: 15m
+  incorrect: some string