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

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

cmd/neofs-node/config/engine/shard/writecache/config.go

@@ -0,0 +1,117 @@
+package writecacheconfig
+
+import (
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+)
+
+// Config is a wrapper over the config section
+// which provides access to WriteCache configurations.
+type Config config.Config
+
+// config defaults
+const (
+	// MemSizeDefault is a default memory size.
+	MemSizeDefault = 1 << 30
+
+	// SmallSizeDefault is a default size of small objects.
+	SmallSizeDefault = 32 << 10
+
+	// MaxSizeDefault is a default value of the object payload size limit.
+	MaxSizeDefault = 64 << 20
+
+	// WorkersNumberDefault is a default number of workers.
+	WorkersNumberDefault = 20
+)
+
+// From wraps config section into Config.
+func From(c *config.Config) *Config {
+	return (*Config)(c)
+}
+
+// Path returns value of "path" config parameter.
+//
+// Panics if value is not a non-empty string.
+func (x *Config) Path() string {
+	p := config.String(
+		(*config.Config)(x),
+		"path",
+	)
+
+	if p == "" {
+		panic("write cache path not set")
+	}
+
+	return p
+}
+
+// MemSize returns value of "mem_size" config parameter.
+//
+// Returns MemSizeDefault if value is not a positive number.
+func (x *Config) MemSize() uint64 {
+	s := config.UintSafe(
+		(*config.Config)(x),
+		"mem_size",
+	)
+
+	if s > 0 {
+		return s
+	}
+
+	return MemSizeDefault
+}
+
+// MaxDBSize returns value of "db_size" config parameter.
+func (x *Config) MaxDBSize() uint64 {
+	return config.UintSafe(
+		(*config.Config)(x),
+		"db_size",
+	)
+}
+
+// SmallObjectSize returns value of "small_size" config parameter.
+//
+// Returns SmallSizeDefault if value is not a positive number.
+func (x *Config) SmallObjectSize() uint64 {
+	s := config.UintSafe(
+		(*config.Config)(x),
+		"small_size",
+	)
+
+	if s > 0 {
+		return s
+	}
+
+	return SmallSizeDefault
+}
+
+// MaxObjectSize returns value of "max_size" config parameter.
+//
+// Returns MaxSizeDefault if value is not a positive number.
+func (x *Config) MaxObjectSize() uint64 {
+	s := config.UintSafe(
+		(*config.Config)(x),
+		"max_size",
+	)
+
+	if s > 0 {
+		return s
+	}
+
+	return MaxSizeDefault
+}
+
+// WorkersNumber returns value of "workers_number" config parameter.
+//
+// Returns WorkersNumberDefault if value is not a positive number.
+func (x *Config) WorkersNumber() int {
+	c := config.IntSafe(
+		(*config.Config)(x),
+		"workers_number",
+	)
+
+	if c > 0 {
+		return int(c)
+	}
+
+	return WorkersNumberDefault
+}