fix: fix to check the negative cache size

metrics.go

@@ -15,6 +15,7 @@ const (
 
 // Metrics contains metrics exposed by this package.
 type Metrics struct {
+ NodeCacheSize metrics.Gauge
  NodeCacheHits metrics.Counter
  NodeCacheMisses metrics.Counter
 }
@@ -28,6 +29,12 @@ func PrometheusMetrics(namespace string, storeName string, labelsAndValues ...st
  labels = append(labels, labelsAndValues[i])
  }
  return &Metrics{
+ NodeCacheSize: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
+ Namespace: namespace,
+ Subsystem: MetricsSubsystem,
+ Name: storeName + "_node_cache_size",
+ Help: "The maximum number of entries in the iavl node db cache",
+ }, labels).With(labelsAndValues...),
  NodeCacheHits: prometheus.NewCounterFrom(stdprometheus.CounterOpts{
  Namespace: namespace,
  Subsystem: MetricsSubsystem,
@@ -46,6 +53,7 @@ func PrometheusMetrics(namespace string, storeName string, labelsAndValues ...st
 // NopMetrics returns no-op Metrics.
 func NopMetrics() *Metrics {
  return &Metrics{
+ NodeCacheSize: discard.NewGauge(),
  NodeCacheHits: discard.NewCounter(),
  NodeCacheMisses: discard.NewCounter(),
  }

nodedb.go

@@ -56,6 +56,10 @@ func newNodeDB(db dbm.DB, cacheSize int, opts *Options) *nodeDB {
  if opts.Metrics == nil {
  opts.Metrics = NopMetrics()
  }
+ if cacheSize < 0 {
+ cacheSize = 0
+ }
+ opts.Metrics.NodeCacheSize.Set(float64(cacheSize))
  return &nodeDB{
  db: db,
  batch: db.NewBatch(),