[#172] Convert handler config to interface

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

api/handler/api.go

@@ -21,7 +21,7 @@ type (
 		log         *zap.Logger
 		obj         layer.Client
 		notificator Notificator
-		cfg         *Config
+		cfg         Config
 	}
 
 	Notificator interface {
@@ -30,29 +30,17 @@ type (
 	}
 
 	// Config contains data which handler needs to keep.
-	Config struct {
-		Policy                     PlacementPolicy
-		XMLDecoder                 XMLDecoderProvider
-		DefaultMaxAge              int
-		NotificatorEnabled         bool
-		ResolveZoneList            []string
-		IsResolveListAllow         bool // True if ResolveZoneList contains allowed zones
-		CompleteMultipartKeepalive time.Duration
-		Kludge                     KludgeSettings
-	}
-
-	PlacementPolicy interface {
+	Config interface {
 		DefaultPlacementPolicy() netmap.PlacementPolicy
 		PlacementPolicy(string) (netmap.PlacementPolicy, bool)
 		CopiesNumbers(string) ([]uint32, bool)
 		DefaultCopiesNumbers() []uint32
-	}
-
-	XMLDecoderProvider interface {
 		NewCompleteMultipartDecoder(io.Reader) *xml.Decoder
-	}
-
-	KludgeSettings interface {
+		DefaultMaxAge() int
+		NotificatorEnabled() bool
+		ResolveZoneList() []string
+		IsResolveListAllow() bool
+		CompleteMultipartKeepalive() time.Duration
 		BypassContentEncodingInChunks() bool
 	}
 )
@@ -60,7 +48,7 @@ type (
 var _ api.Handler = (*handler)(nil)
 
 // New creates new api.Handler using given logger and client.
-func New(log *zap.Logger, obj layer.Client, notificator Notificator, cfg *Config) (api.Handler, error) {
+func New(log *zap.Logger, obj layer.Client, notificator Notificator, cfg Config) (api.Handler, error) {
 	switch {
 	case obj == nil:
 		return nil, errors.New("empty FrostFS Object Layer")
@@ -68,7 +56,7 @@ func New(log *zap.Logger, obj layer.Client, notificator Notificator, cfg *Config
 		return nil, errors.New("empty logger")
 	}
 
-	if !cfg.NotificatorEnabled {
+	if !cfg.NotificatorEnabled() {
 		log.Warn(logs.NotificatorIsDisabledS3WontProduceNotificationEvents)
 	} else if notificator == nil {
 		return nil, errors.New("empty notificator")
@@ -96,12 +84,12 @@ func (h *handler) pickCopiesNumbers(metadata map[string]string, locationConstrai
 		return result, nil
 	}
 
-	copiesNumbers, ok := h.cfg.Policy.CopiesNumbers(locationConstraint)
+	copiesNumbers, ok := h.cfg.CopiesNumbers(locationConstraint)
 	if ok {
 		return copiesNumbers, nil
 	}
 
-	return h.cfg.Policy.DefaultCopiesNumbers(), nil
+	return h.cfg.DefaultCopiesNumbers(), nil
 }
 
 func parseCopiesNumbers(copiesNumbersStr string) ([]uint32, error) {