[#36] Move node attribute code into separate file

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

cmd/neofs-node/attributes.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"strconv"
+
+	sdk "github.com/nspcc-dev/neofs-api-go/pkg/netmap"
+	"github.com/nspcc-dev/neofs-api-go/v2/netmap"
+	"github.com/nspcc-dev/neofs-node/pkg/util/attributes"
+	"github.com/spf13/viper"
+)
+
+const (
+	// list of default values for well-known attributes
+	defaultCapacity = 0
+	defaultPrice    = 0
+)
+
+func parseAttributes(v *viper.Viper) []*netmap.Attribute {
+	stringAttributes := readAttributes(v)
+
+	attrs, err := attributes.ParseV2Attributes(stringAttributes, nil)
+	if err != nil {
+		fatalOnErr(err)
+	}
+
+	return addWellKnownAttributes(attrs)
+}
+
+func readAttributes(v *viper.Viper) (attrs []string) {
+	const maxAttributes = 100
+
+	for i := 0; i < maxAttributes; i++ {
+		attr := v.GetString(cfgNodeAttributePrefix + "_" + strconv.Itoa(i))
+		if attr == "" {
+			return
+		} else {
+			attrs = append(attrs, attr)
+		}
+	}
+
+	return attrs
+}
+
+func addWellKnownAttributes(attrs []*netmap.Attribute) []*netmap.Attribute {
+	var hasCapacity, hasPrice bool
+
+	// check if user defined capacity and price attributes
+	for i := range attrs {
+		if !hasPrice && attrs[i].GetKey() == sdk.PriceAttr {
+			hasPrice = true
+		} else if !hasCapacity && attrs[i].GetKey() == sdk.CapacityAttr {
+			hasCapacity = true
+		}
+	}
+
+	// do not override user defined capacity and price attributes
+
+	if !hasCapacity {
+		capacity := new(netmap.Attribute)
+		capacity.SetKey(sdk.CapacityAttr)
+		capacity.SetValue(strconv.FormatUint(defaultCapacity, 10))
+		attrs = append(attrs, capacity)
+	}
+
+	if !hasPrice {
+		price := new(netmap.Attribute)
+		price.SetKey(sdk.PriceAttr)
+		price.SetValue(strconv.FormatUint(defaultPrice, 10))
+		attrs = append(attrs, price)
+	}
+
+	return attrs
+}