[#493] node/config: Implement integer casters

Implement `Int` / `Uint` functions which casts value to `int64` / `uint64`.
Implement safe functions `IntSafe` / `UintSafe`.

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

cmd/neofs-node/config/cast.go

@@ -68,3 +68,60 @@ func Duration(c *Config, name string) time.Duration {
 func DurationSafe(c *Config, name string) time.Duration {
 	return cast.ToDuration(c.Value(name))
 }
+
+// Bool reads configuration value
+// from c by name and casts it to bool.
+//
+// Panics if value can not be casted.
+func Bool(c *Config, name string) bool {
+	x, err := cast.ToBoolE(c.Value(name))
+	panicOnErr(err)
+
+	return x
+}
+
+// BoolSafe reads configuration value
+// from c by name and casts it to bool.
+//
+// Returns false if value can not be casted.
+func BoolSafe(c *Config, name string) bool {
+	return cast.ToBool(c.Value(name))
+}
+
+// Uint reads configuration value
+// from c by name and casts it to uint64.
+//
+// Panics if value can not be casted.
+func Uint(c *Config, name string) uint64 {
+	x, err := cast.ToUint64E(c.Value(name))
+	panicOnErr(err)
+
+	return x
+}
+
+// UintSafe reads configuration value
+// from c by name and casts it to uint64.
+//
+// Returns 0 if value can not be casted.
+func UintSafe(c *Config, name string) uint64 {
+	return cast.ToUint64(c.Value(name))
+}
+
+// Int reads configuration value
+// from c by name and casts it to int64.
+//
+// Panics if value can not be casted.
+func Int(c *Config, name string) int64 {
+	x, err := cast.ToInt64E(c.Value(name))
+	panicOnErr(err)
+
+	return x
+}
+
+// IntSafe reads configuration value
+// from c by name and casts it to int64.
+//
+// Returns 0 if value can not be casted.
+func IntSafe(c *Config, name string) int64 {
+	return cast.ToInt64(c.Value(name))
+}

cmd/neofs-node/config/cast_test.go

@@ -62,3 +62,37 @@ func TestDuration(t *testing.T) {
 		require.Equal(t, time.Duration(0), val)
 	})
 }
+
+func TestNumbers(t *testing.T) {
+	configtest.ForEachFileType("test/config", func(c *config.Config) {
+		c = c.Sub("number")
+
+		const (
+			intPos = "int_pos"
+			intNeg = "int_neg"
+
+			fractPos = "fract_pos"
+			fractNeg = "fract_neg"
+
+			incorrect = "incorrect"
+		)
+
+		require.EqualValues(t, 1, config.Int(c, intPos))
+		require.EqualValues(t, 1, config.Uint(c, intPos))
+
+		require.EqualValues(t, -1, config.Int(c, intNeg))
+		require.Panics(t, func() { config.Uint(c, intNeg) })
+
+		require.EqualValues(t, 2, config.Int(c, fractPos))
+		require.EqualValues(t, 2, config.Uint(c, fractPos))
+
+		require.EqualValues(t, -2, config.Int(c, fractNeg))
+		require.Panics(t, func() { config.Uint(c, fractNeg) })
+
+		require.Panics(t, func() { config.Int(c, incorrect) })
+		require.Panics(t, func() { config.Uint(c, incorrect) })
+
+		require.Zero(t, config.IntSafe(c, incorrect))
+		require.Zero(t, config.UintSafe(c, incorrect))
+	})
+}

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

@@ -3,6 +3,7 @@
   "section": {
     "any": "thing"
   },
+
   "string_slice": {
     "empty": [],
     "filled": [
@@ -18,5 +19,12 @@
   "duration": {
     "correct": "15m",
     "incorrect": "some string"
+  },
+  "number": {
+    "int_pos": 1,
+    "int_neg": -1,
+    "fract_pos": 2.5,
+    "fract_neg": -2.5,
+    "incorrect": "some string"
   }
 }

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

@@ -20,3 +20,10 @@ string:
 duration:
   correct: 15m
   incorrect: some string
+
+number:
+  int_pos: 1
+  int_neg: -1
+  fract_pos: 2.5
+  fract_neg: -2.5
+  incorrect: some string