[#493] node/config: Implement sections of local object storage

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

cmd/neofs-node/config/engine/shard/blobstor/blobovnicza/config.go

@@ -0,0 +1,93 @@
+package blobovniczaconfig
+
+import (
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+)
+
+// Config is a wrapper over the config section
+// which provides access to Blobovnicza configurations.
+type Config config.Config
+
+// config defaults
+const (
+	// SizeDefault is a default limit of estimates of Blobovnicza size.
+	SizeDefault = 1 << 30
+
+	// ShallowDepthDefault is a default shallow dir depth.
+	ShallowDepthDefault = 2
+
+	// ShallowWidthDefault is a default shallow dir width.
+	ShallowWidthDefault = 16
+
+	// OpenedCacheSizeDefault is a default cache size of opened Blobovnicza's.
+	OpenedCacheSizeDefault = 16
+)
+
+// From wraps config section into Config.
+func From(c *config.Config) *Config {
+	return (*Config)(c)
+}
+
+// Size returns value of "size" config parameter.
+//
+// Returns SizeDefault if value is not a positive number.
+func (x *Config) Size() uint64 {
+	s := config.UintSafe(
+		(*config.Config)(x),
+		"size",
+	)
+
+	if s > 0 {
+		return s
+	}
+
+	return SizeDefault
+}
+
+// ShallowDepth returns value of "shallow_depth" config parameter.
+//
+// Returns ShallowDepthDefault if value is not a positive number.
+func (x *Config) ShallowDepth() uint64 {
+	d := config.UintSafe(
+		(*config.Config)(x),
+		"shallow_depth",
+	)
+
+	if d > 0 {
+		return d
+	}
+
+	return ShallowDepthDefault
+}
+
+// ShallowWidth returns value of "shallow_width" config parameter.
+//
+// Returns ShallowWidthDefault if value is not a positive number.
+func (x *Config) ShallowWidth() uint64 {
+	d := config.UintSafe(
+		(*config.Config)(x),
+		"shallow_width",
+	)
+
+	if d > 0 {
+		return d
+	}
+
+	return ShallowWidthDefault
+}
+
+// OpenedCacheSize returns value of "opened_cache_size" config parameter.
+//
+// Returns OpenedCacheSizeDefault if value is not a positive number.
+func (x *Config) OpenedCacheSize() int {
+	d := config.IntSafe(
+		(*config.Config)(x),
+		"opened_cache_size",
+	)
+
+	if d > 0 {
+		return int(d)
+	}
+
+	return OpenedCacheSizeDefault
+}