[#255] pkg/netmap: Define constant keys to all well-known attributes

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

pkg/netmap/node_info.go

@@ -51,6 +51,40 @@ const (
 	// AttrCapacity is a key to the node attribute that indicates the
 	// total available disk space in Gigabytes.
 	AttrCapacity = "Capacity"
+
+	// AttrSubnet is a key to the node attribute that indicates the
+	// string ID of node's storage subnet.
+	AttrSubnet = "Subnet"
+
+	// AttrUNLOCODE is a key to the node attribute that indicates the
+	// node's geographic location in UN/LOCODE format.
+	AttrUNLOCODE = "UN-LOCODE"
+
+	// AttrCountryCode is a key to the node attribute that indicates the
+	// Country code in ISO 3166-1_alpha-2 format.
+	AttrCountryCode = "CountryCode"
+
+	// AttrCountry is a key to the node attribute that indicates the
+	// country short name in English, as defined in ISO-3166.
+	AttrCountry = "Country"
+
+	// AttrLocation is a key to the node attribute that indicates the
+	// place name of the node location.
+	AttrLocation = "Location"
+
+	// AttrSubDivCode is a key to the node attribute that indicates the
+	// country's administrative subdivision where node is located
+	// in ISO 3166-2 format.
+	AttrSubDivCode = "SubDivCode"
+
+	// AttrSubDiv is a key to the node attribute that indicates the
+	// country's administrative subdivision name, as defined in
+	// ISO 3166-2.
+	AttrSubDiv = "SubDiv"
+
+	// AttrContinent is a key to the node attribute that indicates the
+	// node's continent name according to the Seven-Continent model.
+	AttrContinent = "Continent"
 )
 
 var _ hrw.Hasher = (*Node)(nil)