[#168] node: Refactor shard opts initialization

Resolve funlen linter for shardOpts method

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

cmd/frostfs-node/config.go

@@ -708,11 +708,17 @@ type shardOptsWithID struct {
 	shOpts   []shard.Option
 }
 
-// nolint: funlen
 func (c *cfg) shardOpts() []shardOptsWithID {
 	shards := make([]shardOptsWithID, 0, len(c.EngineCfg.shards))
 
 	for _, shCfg := range c.EngineCfg.shards {
+		shards = append(shards, c.getShardOpts(shCfg))
+	}
+
+	return shards
+}
+
+func (c *cfg) getWriteCacheOpts(shCfg shardCfg) []writecache.Option {
 	var writeCacheOpts []writecache.Option
 	if wcRead := shCfg.writecacheCfg; wcRead.enabled {
 		writeCacheOpts = append(writeCacheOpts,
@@ -727,7 +733,10 @@ func (c *cfg) shardOpts() []shardOptsWithID {
 			writecache.WithLogger(c.log),
 		)
 	}
+	return writeCacheOpts
+}
 
+func (c *cfg) getPiloramaOpts(shCfg shardCfg) []pilorama.Option {
 	var piloramaOpts []pilorama.Option
 	if prRead := shCfg.piloramaCfg; prRead.enabled {
 		piloramaOpts = append(piloramaOpts,
@@ -738,7 +747,10 @@ func (c *cfg) shardOpts() []shardOptsWithID {
 			pilorama.WithMaxBatchDelay(prRead.maxBatchDelay),
 		)
 	}
+	return piloramaOpts
+}
 
+func (c *cfg) getSubstorageOpts(shCfg shardCfg) []blobstor.SubStorage {
 	var ss []blobstor.SubStorage
 	for _, sRead := range shCfg.subStorages {
 		switch sRead.typ {
@@ -773,6 +785,13 @@ func (c *cfg) shardOpts() []shardOptsWithID {
 			// been handled: when the config was read
 		}
 	}
+	return ss
+}
+
+func (c *cfg) getShardOpts(shCfg shardCfg) shardOptsWithID {
+	writeCacheOpts := c.getWriteCacheOpts(shCfg)
+	piloramaOpts := c.getPiloramaOpts(shCfg)
+	ss := c.getSubstorageOpts(shCfg)
 
 	var sh shardOptsWithID
 	sh.configID = shCfg.id()
@@ -813,11 +832,7 @@ func (c *cfg) shardOpts() []shardOptsWithID {
 			return pool
 		}),
 	}
-
+	return sh
-		shards = append(shards, sh)
-	}
-
-	return shards
 }
 
 func (c *cfg) loggerPrm() (*logger.Prm, error) {