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

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

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

@@ -0,0 +1,67 @@
+package contractsconfig
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+)
+
+const (
+	subsection = "contracts"
+)
+
+// Netmap returns value of "netmap" config parameter
+// from "contracts" section.
+//
+// Throws panic if value is not is not a 20-byte LE hex-encoded string.
+func Netmap(c *config.Config) util.Uint160 {
+	return contractAddress(c, "netmap")
+}
+
+// Balance returns value of "balance" config parameter
+// from "contracts" section.
+//
+// Throws panic if value is not is not a 20-byte LE hex-encoded string.
+func Balance(c *config.Config) util.Uint160 {
+	return contractAddress(c, "balance")
+}
+
+// Container returns value of "container" config parameter
+// from "contracts" section.
+//
+// Throws panic if value is not is not a 20-byte LE hex-encoded string.
+func Container(c *config.Config) util.Uint160 {
+	return contractAddress(c, "container")
+}
+
+// Reputation returns value of "reputation" config parameter
+// from "contracts" section.
+//
+// Throws panic if value is not is not a 20-byte LE hex-encoded string.
+func Reputation(c *config.Config) util.Uint160 {
+	return contractAddress(c, "reputation")
+}
+
+func contractAddress(c *config.Config, name string) util.Uint160 {
+	v := config.String(c.Sub(subsection), name)
+	if v == "" {
+		panic(fmt.Errorf(
+			"empty %s contract address, see `contracts.%s` section",
+			name,
+			name,
+		))
+	}
+
+	addr, err := util.Uint160DecodeStringLE(v)
+	if err != nil {
+		panic(fmt.Errorf(
+			"can't parse %s contract address %s: %w",
+			name,
+			v,
+			err,
+		))
+	}
+
+	return addr
+}