[#493] cmd/node: Add object service section to config

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

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

@@ -0,0 +1,41 @@
+package objectconfig
+
+import (
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+)
+
+// PutConfig is a wrapper over "put" config section which provides access
+// to object put pipeline configuration of object service.
+type PutConfig struct {
+	cfg *config.Config
+}
+
+const (
+	subsection = "object"
+
+	putSubsection = "put"
+
+	// PutPoolSizeDefault is a default value of routine pool size to
+	// process object.Put requests in object service.
+	PutPoolSizeDefault = 10
+)
+
+// Put returns structure that provides access to "put" subsection of
+// "object" section.
+func Put(c *config.Config) PutConfig {
+	return PutConfig{
+		c.Sub(subsection).Sub(putSubsection),
+	}
+}
+
+// PoolSize returns value of "pool_size" config parameter.
+//
+// Returns PutPoolSizeDefault if value is not positive number.
+func (g PutConfig) PoolSize() int {
+	v := config.Int(g.cfg, "pool_size")
+	if v > 0 {
+		return int(v)
+	}
+
+	return PutPoolSizeDefault
+}