[#776] cmd/node: Configure write-cache size limit

Add `size_limit` config value to write-cache section. Add `SizeLimit` method
of `writecache.Config` type. Pass its value to `WithMaxCacheSize` option on
app construction.

Reflect config update in examples. Cover new value in unit test.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-node/config.go

@@ -369,6 +369,7 @@ func initShardOptions(c *cfg) {
 				writecache.WithMaxObjectSize(writeCacheCfg.MaxObjectSize()),
 				writecache.WithSmallObjectSize(writeCacheCfg.SmallObjectSize()),
 				writecache.WithFlushWorkersCount(writeCacheCfg.WorkersNumber()),
+				writecache.WithMaxCacheSize(writeCacheCfg.SizeLimit()),
 			}
 		}
 

cmd/neofs-node/config/engine/config_test.go

@@ -44,6 +44,7 @@ func TestEngineSection(t *testing.T) {
 				require.EqualValues(t, 16384, wc.SmallObjectSize())
 				require.EqualValues(t, 134217728, wc.MaxObjectSize())
 				require.EqualValues(t, 30, wc.WorkersNumber())
+				require.EqualValues(t, 3221225472, wc.SizeLimit())
 
 				require.Equal(t, "tmp/0/meta", meta.Path())
 				require.Equal(t, fs.FileMode(0644), meta.Perm())
@@ -69,6 +70,7 @@ func TestEngineSection(t *testing.T) {
 				require.EqualValues(t, 16384, wc.SmallObjectSize())
 				require.EqualValues(t, 134217728, wc.MaxObjectSize())
 				require.EqualValues(t, 30, wc.WorkersNumber())
+				require.EqualValues(t, 4294967296, wc.SizeLimit())
 
 				require.Equal(t, "tmp/1/meta", meta.Path())
 				require.Equal(t, fs.FileMode(0644), meta.Perm())

cmd/neofs-node/config/engine/shard/writecache/config.go

@@ -21,6 +21,9 @@ const (
 
 	// WorkersNumberDefault is a default number of workers.
 	WorkersNumberDefault = 20
+
+	// SizeLimitDefault is a default write-cache size limit.
+	SizeLimitDefault = 1 << 30
 )
 
 // From wraps config section into Config.
@@ -107,3 +110,19 @@ func (x *Config) WorkersNumber() int {
 
 	return WorkersNumberDefault
 }
+
+// SizeLimit returns value of "size_limit" config parameter.
+//
+// Returns SizeLimitDefault if value is not a positive number.
+func (x *Config) SizeLimit() uint64 {
+	c := config.UintSafe(
+		(*config.Config)(x),
+		"size_limit",
+	)
+
+	if c > 0 {
+		return c
+	}
+
+	return SizeLimitDefault
+}

config/example/node.env

@@ -76,6 +76,7 @@ NEOFS_STORAGE_SHARD_0_WRITECACHE_MEM_SIZE=2147483648
 NEOFS_STORAGE_SHARD_0_WRITECACHE_SMALL_SIZE=16384
 NEOFS_STORAGE_SHARD_0_WRITECACHE_MAX_SIZE=134217728
 NEOFS_STORAGE_SHARD_0_WRITECACHE_WORKERS_NUMBER=30
+NEOFS_STORAGE_SHARD_0_WRITECACHE_SIZE_LIMIT=3221225472
 ### Metabase config
 NEOFS_STORAGE_SHARD_0_METABASE_PATH=tmp/0/meta
 NEOFS_STORAGE_SHARD_0_METABASE_PERM=0644
@@ -104,6 +105,7 @@ NEOFS_STORAGE_SHARD_1_WRITECACHE_MEM_SIZE=2147483648
 NEOFS_STORAGE_SHARD_1_WRITECACHE_SMALL_SIZE=16384
 NEOFS_STORAGE_SHARD_1_WRITECACHE_MAX_SIZE=134217728
 NEOFS_STORAGE_SHARD_1_WRITECACHE_WORKERS_NUMBER=30
+NEOFS_STORAGE_SHARD_1_WRITECACHE_SIZE_LIMIT=4294967296
 ### Metabase config
 NEOFS_STORAGE_SHARD_1_METABASE_PATH=tmp/1/meta
 NEOFS_STORAGE_SHARD_1_METABASE_PERM=0644

config/example/node.json

@@ -110,7 +110,8 @@
           "mem_size": 2147483648,
           "small_size": 16384,
           "max_size": 134217728,
-          "workers_number": 30
+          "workers_number": 30,
+          "size_limit": 3221225472
         },
         "metabase": {
           "path": "tmp/0/meta",
@@ -141,7 +142,8 @@
           "mem_size": 2147483648,
           "small_size": 16384,
           "max_size": 134217728,
-          "workers_number": 30
+          "workers_number": 30,
+          "size_limit": 4294967296
         },
         "metabase": {
           "path": "tmp/1/meta",

config/example/node.yaml

@@ -98,6 +98,7 @@ storage:
         small_size: 16384
         max_size: 134217728
         workers_number: 30
+        size_limit: 3221225472
 
       metabase:
         path: tmp/0/meta
@@ -129,6 +130,7 @@ storage:
         small_size: 16384
         max_size: 134217728
         workers_number: 30
+        size_limit: 4294967296
 
       metabase:
         path: tmp/1/meta