[#28] Make storage node configurable

To run storage node at dev-env environment it should have
configurable parameters. To keep `cfg` structures we can
read configuration from env and yml config file with viper
and parse values such as script hashes, fees, keys into
`cfg` structures.

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

cmd/neofs-node/config.go

@@ -4,18 +4,47 @@ import (
 	"context"
 	"crypto/ecdsa"
 	"net"
+	"strings"
 	"sync"
 
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	crypto "github.com/nspcc-dev/neofs-crypto"
+	"github.com/nspcc-dev/neofs-node/misc"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
 	tokenStorage "github.com/nspcc-dev/neofs-node/pkg/services/session/storage"
+	"github.com/spf13/viper"
 	"google.golang.org/grpc"
 )
 
+const (
+	// config keys for cfgNodeInfo
+	cfgNodeKey          = "node.key"
+	cfgBootstrapAddress = "node.address"
+
+	// config keys for cfgGRPC
+	cfgListenAddress = "grpc.endpoint"
+
+	// config keys for cfgMorph
+	cfgMorphRPCAddress = "morph.endpoint"
+
+	// config keys for cfgAccounting
+	cfgAccountingContract = "accounting.scripthash"
+	cfgAccountingFee      = "accounting.fee"
+
+	// config keys for cfgNetmap
+	cfgNetmapContract = "netmap.scripthash"
+	cfgNetmapFee      = "netmap.fee"
+
+	// config keys for cfgContainer
+	cfgContainerContract = "container.scripthash"
+	cfgContainerFee      = "container.fee"
+)
+
 type cfg struct {
 	ctx context.Context
 
+	viper *viper.Viper
+
 	wg *sync.WaitGroup
 
 	key *ecdsa.PrivateKey
@@ -36,33 +65,29 @@ type cfg struct {
 }
 
 type cfgGRPC struct {
-	endpoint string
-
 	listener net.Listener
 
 	server *grpc.Server
 }
 
 type cfgMorph struct {
-	endpoint string
-
 	client *client.Client
 }
 
 type cfgAccounting struct {
-	scriptHash string
+	scriptHash util.Uint160
 
 	fee util.Fixed8
 }
 
 type cfgContainer struct {
-	scriptHash string
+	scriptHash util.Uint160
 
 	fee util.Fixed8
 }
 
 type cfgNetmap struct {
-	scriptHash string
+	scriptHash util.Uint160
 
 	fee util.Fixed8
 }
@@ -71,8 +96,6 @@ type BootstrapType uint32
 
 type cfgNodeInfo struct {
 	bootType BootstrapType
-
-	address string
 }
 
 const (
@@ -81,34 +104,82 @@ const (
 	RelayNode
 )
 
-func defaultCfg() *cfg {
-	key, err := crypto.LoadPrivateKey("Kwk6k2eC3L3QuPvD8aiaNyoSXgQ2YL1bwS5CP1oKoA9waeAze97s")
+func initCfg(path string) *cfg {
+	viperCfg := initViper(path)
+
+	key, err := crypto.LoadPrivateKey(viperCfg.GetString(cfgNodeKey))
+	fatalOnErr(err)
+
+	u160Accounting, err := util.Uint160DecodeStringLE(
+		viperCfg.GetString(cfgAccountingContract))
+	fatalOnErr(err)
+
+	u160Netmap, err := util.Uint160DecodeStringLE(
+		viperCfg.GetString(cfgNetmapContract))
+	fatalOnErr(err)
+
+	u160Container, err := util.Uint160DecodeStringLE(
+		viperCfg.GetString(cfgContainerContract))
 	fatalOnErr(err)
 
 	return &cfg{
-		ctx: context.Background(),
-		wg:  new(sync.WaitGroup),
-		key: key,
-		cfgGRPC: cfgGRPC{
-			endpoint: "127.0.0.1:50501",
-		},
-		cfgMorph: cfgMorph{
-			endpoint: "http://morph_chain.localtest.nspcc.ru:30333/",
-		},
+		ctx:   context.Background(),
+		viper: viperCfg,
+		wg:    new(sync.WaitGroup),
+		key:   key,
 		cfgAccounting: cfgAccounting{
-			scriptHash: "1aeefe1d0dfade49740fff779c02cd4a0538ffb1",
-			fee:        util.Fixed8(1),
+			scriptHash: u160Accounting,
+			fee:        util.Fixed8(viperCfg.GetInt(cfgAccountingFee)),
 		},
 		cfgContainer: cfgContainer{
-			scriptHash: "9d2ca84d7fb88213c4baced5a6ed4dc402309039",
-			fee:        util.Fixed8(1),
+			scriptHash: u160Container,
+			fee:        util.Fixed8(viperCfg.GetInt(cfgContainerFee)),
 		},
 		cfgNetmap: cfgNetmap{
-			scriptHash: "75194459637323ea8837d2afe8225ec74a5658c3",
-			fee:        util.Fixed8(1),
+			scriptHash: u160Netmap,
+			fee:        util.Fixed8(viperCfg.GetInt(cfgNetmapFee)),
 		},
 		cfgNodeInfo: cfgNodeInfo{
 			bootType: StorageNode,
 		},
 	}
 }
+
+func initViper(path string) *viper.Viper {
+	v := viper.New()
+
+	v.SetEnvPrefix(misc.Prefix)
+	v.AutomaticEnv()
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+
+	v.SetDefault("app.name", misc.NodeName)
+	v.SetDefault("app.version", misc.Version)
+
+	defaultConfiguration(v)
+
+	if path != "" {
+		v.SetConfigFile(path)
+		v.SetConfigType("yml")
+		fatalOnErr(v.ReadInConfig())
+	}
+
+	return v
+}
+
+func defaultConfiguration(v *viper.Viper) {
+	// fixme: all hardcoded private keys must be removed
+	v.SetDefault(cfgNodeKey, "Kwk6k2eC3L3QuPvD8aiaNyoSXgQ2YL1bwS5CP1oKoA9waeAze97s")
+	v.SetDefault(cfgBootstrapAddress, "") // address to bootstrap with
+
+	v.SetDefault(cfgMorphRPCAddress, "http://morph_chain.localtest.nspcc.ru:30333/")
+	v.SetDefault(cfgListenAddress, "127.0.0.1:50501") // listen address
+
+	v.SetDefault(cfgAccountingContract, "1aeefe1d0dfade49740fff779c02cd4a0538ffb1")
+	v.SetDefault(cfgAccountingFee, "1")
+
+	v.SetDefault(cfgContainerContract, "9d2ca84d7fb88213c4baced5a6ed4dc402309039")
+	v.SetDefault(cfgContainerFee, "1")
+
+	v.SetDefault(cfgNetmapContract, "75194459637323ea8837d2afe8225ec74a5658c3")
+	v.SetDefault(cfgNetmapFee, "1")
+}