[#426] service/object: Add object service metrics collector

Collect number of request per method in object service.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/services/object/metrics.go

@@ -0,0 +1,146 @@
+package object
+
+import (
+	"context"
+
+	"github.com/nspcc-dev/neofs-api-go/v2/object"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type (
+	MetricCollector struct {
+		next ServiceServer
+	}
+)
+
+const (
+	namespace = "neofs_node"
+	subsystem = "object"
+)
+
+// Request counter metrics.
+var (
+	getCounter = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace:   namespace,
+		Subsystem:   subsystem,
+		Name:        "get_req_count",
+		Help:        "Number of get request processed",
+		ConstLabels: nil,
+	})
+
+	putCounter = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: namespace,
+		Subsystem: subsystem,
+		Name:      "put_req_count",
+		Help:      "Number of put request processed",
+	})
+
+	headCounter = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: namespace,
+		Subsystem: subsystem,
+		Name:      "head_req_count",
+		Help:      "Number of head request processed",
+	})
+
+	searchCounter = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: namespace,
+		Subsystem: subsystem,
+		Name:      "search_req_count",
+		Help:      "Number of search request processed",
+	})
+
+	deleteCounter = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: namespace,
+		Subsystem: subsystem,
+		Name:      "delete_req_count",
+		Help:      "Number of delete request processed",
+	})
+
+	rangeCounter = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: namespace,
+		Subsystem: subsystem,
+		Name:      "range_req_count",
+		Help:      "Number of range request processed",
+	})
+
+	rangeHashCounter = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: namespace,
+		Subsystem: subsystem,
+		Name:      "range_hash_req_count",
+		Help:      "Number of range hash request processed",
+	})
+)
+
+func registerMetrics() {
+	prometheus.MustRegister(getCounter) // todo: replace with for loop over map
+	prometheus.MustRegister(putCounter)
+	prometheus.MustRegister(headCounter)
+	prometheus.MustRegister(searchCounter)
+	prometheus.MustRegister(deleteCounter)
+	prometheus.MustRegister(rangeCounter)
+	prometheus.MustRegister(rangeHashCounter)
+}
+
+func NewMetricCollector(next ServiceServer) *MetricCollector {
+	registerMetrics()
+
+	return &MetricCollector{
+		next: next,
+	}
+}
+
+func (m MetricCollector) Get(req *object.GetRequest, stream GetObjectStream) error {
+	defer func() {
+		getCounter.Inc()
+	}()
+
+	return m.next.Get(req, stream)
+}
+
+func (m MetricCollector) Put(ctx context.Context) (object.PutObjectStreamer, error) {
+	defer func() {
+		putCounter.Inc()
+	}()
+
+	return m.next.Put(ctx)
+}
+
+func (m MetricCollector) Head(ctx context.Context, request *object.HeadRequest) (*object.HeadResponse, error) {
+	defer func() {
+		headCounter.Inc()
+	}()
+
+	return m.next.Head(ctx, request)
+}
+
+func (m MetricCollector) Search(req *object.SearchRequest, stream SearchStream) error {
+	defer func() {
+		searchCounter.Inc()
+	}()
+
+	return m.next.Search(req, stream)
+}
+
+func (m MetricCollector) Delete(ctx context.Context, request *object.DeleteRequest) (*object.DeleteResponse, error) {
+	defer func() {
+		deleteCounter.Inc()
+	}()
+
+	return m.next.Delete(ctx, request)
+}
+
+func (m MetricCollector) GetRange(req *object.GetRangeRequest, stream GetObjectRangeStream) error {
+	defer func() {
+		rangeCounter.Inc()
+	}()
+
+	return m.next.GetRange(req, stream)
+}
+
+func (m MetricCollector) GetRangeHash(ctx context.Context, request *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error) {
+	defer func() {
+		rangeHashCounter.Inc()
+	}()
+
+	return m.next.GetRangeHash(ctx, request)
+}