github.com/cilium/cilium@v1.16.2/pkg/hubble/metrics/drop/handler.go (about)

     1  // SPDX-License-Identifier: Apache-2.0
     2  // Copyright Authors of Hubble
     3  
     4  package drop
     5  
     6  import (
     7  	"context"
     8  
     9  	"github.com/prometheus/client_golang/prometheus"
    10  
    11  	flowpb "github.com/cilium/cilium/api/v1/flow"
    12  	v1 "github.com/cilium/cilium/pkg/hubble/api/v1"
    13  	"github.com/cilium/cilium/pkg/hubble/metrics/api"
    14  )
    15  
    16  type dropHandler struct {
    17  	drops   *prometheus.CounterVec
    18  	context *api.ContextOptions
    19  }
    20  
    21  func (d *dropHandler) Init(registry *prometheus.Registry, options api.Options) error {
    22  	c, err := api.ParseContextOptions(options)
    23  	if err != nil {
    24  		return err
    25  	}
    26  	d.context = c
    27  
    28  	contextLabels := d.context.GetLabelNames()
    29  	labels := append(contextLabels, "reason", "protocol")
    30  
    31  	d.drops = prometheus.NewCounterVec(prometheus.CounterOpts{
    32  		Namespace: api.DefaultPrometheusNamespace,
    33  		Name:      "drop_total",
    34  		Help:      "Number of drops",
    35  	}, labels)
    36  
    37  	registry.MustRegister(d.drops)
    38  	return nil
    39  }
    40  
    41  func (d *dropHandler) Status() string {
    42  	return d.context.Status()
    43  }
    44  
    45  func (d *dropHandler) Context() *api.ContextOptions {
    46  	return d.context
    47  }
    48  
    49  func (d *dropHandler) ListMetricVec() []*prometheus.MetricVec {
    50  	return []*prometheus.MetricVec{d.drops.MetricVec}
    51  }
    52  
    53  func (d *dropHandler) ProcessFlow(ctx context.Context, flow *flowpb.Flow) error {
    54  	if flow.GetVerdict() != flowpb.Verdict_DROPPED {
    55  		return nil
    56  	}
    57  
    58  	contextLabels, err := d.context.GetLabelValues(flow)
    59  	if err != nil {
    60  		return err
    61  	}
    62  
    63  	labels := append(contextLabels, flow.GetDropReasonDesc().String(), v1.FlowProtocol(flow))
    64  
    65  	d.drops.WithLabelValues(labels...).Inc()
    66  	return nil
    67  }