github.com/celestiaorg/celestia-node@v0.15.0-beta.1/share/eds/cache/metrics.go (about)

     1  package cache
     2  
     3  import (
     4  	"context"
     5  
     6  	"go.opentelemetry.io/otel/attribute"
     7  	"go.opentelemetry.io/otel/metric"
     8  )
     9  
    10  const (
    11  	cacheFoundKey = "found"
    12  	failedKey     = "failed"
    13  )
    14  
    15  type metrics struct {
    16  	getCounter     metric.Int64Counter
    17  	evictedCounter metric.Int64Counter
    18  }
    19  
    20  func newMetrics(bc *AccessorCache) (*metrics, error) {
    21  	metricsPrefix := "eds_blockstore_cache_" + bc.name
    22  
    23  	evictedCounter, err := meter.Int64Counter(metricsPrefix+"_evicted_counter",
    24  		metric.WithDescription("eds blockstore cache evicted event counter"))
    25  	if err != nil {
    26  		return nil, err
    27  	}
    28  
    29  	getCounter, err := meter.Int64Counter(metricsPrefix+"_get_counter",
    30  		metric.WithDescription("eds blockstore cache evicted event counter"))
    31  	if err != nil {
    32  		return nil, err
    33  	}
    34  
    35  	cacheSize, err := meter.Int64ObservableGauge(metricsPrefix+"_size",
    36  		metric.WithDescription("total amount of items in blockstore cache"),
    37  	)
    38  	if err != nil {
    39  		return nil, err
    40  	}
    41  
    42  	callback := func(ctx context.Context, observer metric.Observer) error {
    43  		observer.ObserveInt64(cacheSize, int64(bc.cache.Len()))
    44  		return nil
    45  	}
    46  	_, err = meter.RegisterCallback(callback, cacheSize)
    47  
    48  	return &metrics{
    49  		getCounter:     getCounter,
    50  		evictedCounter: evictedCounter,
    51  	}, err
    52  }
    53  
    54  func (m *metrics) observeEvicted(failed bool) {
    55  	if m == nil {
    56  		return
    57  	}
    58  	m.evictedCounter.Add(context.Background(), 1,
    59  		metric.WithAttributes(
    60  			attribute.Bool(failedKey, failed)))
    61  }
    62  
    63  func (m *metrics) observeGet(found bool) {
    64  	if m == nil {
    65  		return
    66  	}
    67  	m.getCounter.Add(context.Background(), 1, metric.WithAttributes(
    68  		attribute.Bool(cacheFoundKey, found)))
    69  }