[#170] Implement --vote argument in neofs-ir

With this argument neofs-ir will be run as an CLI
application that initialize inner ring server, invokes
`vote` method on corresponding alphabet contract and
exits.

User can provide a comma-separated list of validator
public keys.

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

cmd/neofs-ir/main.go

@@ -4,7 +4,9 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"strings"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-node/misc"
 	"github.com/nspcc-dev/neofs-node/pkg/innerring"
 	"github.com/nspcc-dev/neofs-node/pkg/util/grace"
@@ -30,6 +32,7 @@ func exitErr(err error) {
 
 func main() {
 	configFile := flag.String("config", "", "path to config")
+	validators := flag.String("vote", "", "hex encoded public keys split with comma")
 	versionFlag := flag.Bool("version", false, "neofs-ir node version")
 	flag.Parse()
 
@@ -55,6 +58,16 @@ func main() {
 		exitErr(err)
 	}
 
+	if len(*validators) != 0 {
+		validatorKeys, err := parsePublicKeysFromString(*validators)
+		exitErr(err)
+
+		err = innerRing.InitAndVoteForSidechainValidator(validatorKeys)
+		exitErr(err)
+
+		return
+	}
+
 	// start pprof if enabled
 	if pprof != nil {
 		pprof.Start(ctx)
@@ -86,3 +99,9 @@ func main() {
 
 	log.Info("application stopped")
 }
+
+func parsePublicKeysFromString(argument string) ([]keys.PublicKey, error) {
+	publicKeysString := strings.Split(argument, ",")
+
+	return innerring.ParsePublicKeysFromStrings(publicKeysString)
+}

pkg/innerring/state.go

@@ -51,3 +51,15 @@ func (s *Server) voteForSidechainValidator(validators []keys.PublicKey) error {
 
 	return invoke.AlphabetVote(s.morphClient, s.contracts.alphabet[index], candidate)
 }
+
+// InitAndVoteForSidechainValidator is a public function to use outside of
+// inner ring daemon execution. It initialize inner ring structure with data
+// from blockchain and then calls vote method on corresponding alphabet contract.
+func (s *Server) InitAndVoteForSidechainValidator(validators []keys.PublicKey) error {
+	err := s.initConfigFromBlockchain()
+	if err != nil {
+		return err
+	}
+
+	return s.voteForSidechainValidator(validators)
+}