[#6] services/util: Simplify response.Service

It has only 1 parameter, which is obligatory.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

cmd/frostfs-node/config.go

@@ -622,7 +622,7 @@ func initShared(appCfg *config.Config, key *keys.PrivateKey, netState *networkSt
 		key:            key,
 		binPublicKey:   key.PublicKey().Bytes(),
 		localAddr:      netAddr,
-		respSvc:        response.NewService(response.WithNetworkState(netState)),
+		respSvc:        response.NewService(netState),
 		clientCache:    cache.NewSDKClientCache(cacheOpts),
 		bgClientCache:  cache.NewSDKClientCache(cacheOpts),
 		putClientCache: cache.NewSDKClientCache(cacheOpts),

pkg/services/util/response/service.go

@@ -11,45 +11,24 @@ import (
 // Service represents universal v2 service
 // that sets response meta header values.
 type Service struct {
-	cfg *cfg
-}
-
-// Option is an option of Service constructor.
-type Option func(*cfg)
-
-type cfg struct {
 	version refs.Version
 
 	state netmap.State
 }
 
-func defaultCfg() *cfg {
-	var c cfg
-
-	version.Current().WriteToV2(&c.version)
-
-	return &c
-}
-
 // NewService creates, initializes and returns Service instance.
-func NewService(opts ...Option) *Service {
-	c := defaultCfg()
-
-	for i := range opts {
-		opts[i](c)
-	}
-
-	return &Service{
-		cfg: c,
-	}
+func NewService(nmState netmap.State) *Service {
+	s := &Service{state: nmState}
+	version.Current().WriteToV2(&s.version)
+	return s
 }
 
 // SetMeta sets adds meta-header to resp.
 func (s *Service) SetMeta(resp util.ResponseMessage) {
 	meta := new(session.ResponseMetaHeader)
-	meta.SetVersion(&s.cfg.version)
+	meta.SetVersion(&s.version)
 	meta.SetTTL(1) // FIXME: #1160 TTL must be calculated
-	meta.SetEpoch(s.cfg.state.CurrentEpoch())
+	meta.SetEpoch(s.state.CurrentEpoch())
 
 	if origin := resp.GetMetaHeader(); origin != nil {
 		// FIXME: #1160 what if origin is set by local server?
@@ -58,10 +37,3 @@ func (s *Service) SetMeta(resp util.ResponseMessage) {
 
 	resp.SetMetaHeader(meta)
 }
-
-// WithNetworkState returns option to set network state of Service.
-func WithNetworkState(v netmap.State) Option {
-	return func(c *cfg) {
-		c.state = v
-	}
-}