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handler.go
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handler.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Hubble
package tcp
import (
"context"
"github.com/prometheus/client_golang/prometheus"
flowpb "github.com/cilium/cilium/api/v1/flow"
"github.com/cilium/cilium/pkg/hubble/metrics/api"
)
type tcpHandler struct {
tcpFlags *prometheus.CounterVec
context *api.ContextOptions
}
func (h *tcpHandler) Init(registry *prometheus.Registry, options api.Options) error {
c, err := api.ParseContextOptions(options)
if err != nil {
return err
}
h.context = c
labels := []string{"flag", "family"}
labels = append(labels, h.context.GetLabelNames()...)
h.tcpFlags = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: api.DefaultPrometheusNamespace,
Name: "tcp_flags_total",
Help: "TCP flag occurrences",
}, labels)
registry.MustRegister(h.tcpFlags)
return nil
}
func (h *tcpHandler) Status() string {
return h.context.Status()
}
func (h *tcpHandler) Context() *api.ContextOptions {
return h.context
}
func (h *tcpHandler) ListMetricVec() []*prometheus.MetricVec {
return []*prometheus.MetricVec{h.tcpFlags.MetricVec}
}
func (h *tcpHandler) ProcessFlow(ctx context.Context, flow *flowpb.Flow) error {
if (flow.GetVerdict() != flowpb.Verdict_FORWARDED && flow.GetVerdict() != flowpb.Verdict_REDIRECTED) ||
flow.GetL4() == nil {
return nil
}
ip := flow.GetIP()
tcp := flow.GetL4().GetTCP()
if ip == nil || tcp == nil || tcp.Flags == nil {
return nil
}
contextLabels, err := h.context.GetLabelValues(flow)
if err != nil {
return err
}
labels := append([]string{"", ip.IpVersion.String()}, contextLabels...)
if tcp.Flags.FIN {
labels[0] = "FIN"
h.tcpFlags.WithLabelValues(labels...).Inc()
}
if tcp.Flags.SYN {
if tcp.Flags.ACK {
labels[0] = "SYN-ACK"
h.tcpFlags.WithLabelValues(labels...).Inc()
} else {
labels[0] = "SYN"
h.tcpFlags.WithLabelValues(labels...).Inc()
}
}
if tcp.Flags.RST {
labels[0] = "RST"
h.tcpFlags.WithLabelValues(labels...).Inc()
}
return nil
}