/
tcp_analyzer.go
182 lines (161 loc) · 5.71 KB
/
tcp_analyzer.go
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package tcpmetricanalyzer
import (
"fmt"
"github.com/hashicorp/go-multierror"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/Kindling-project/kindling/collector/pkg/component"
"github.com/Kindling-project/kindling/collector/pkg/component/analyzer"
"github.com/Kindling-project/kindling/collector/pkg/component/consumer"
conntrackerpackge "github.com/Kindling-project/kindling/collector/pkg/metadata/conntracker"
"github.com/Kindling-project/kindling/collector/pkg/model"
"github.com/Kindling-project/kindling/collector/pkg/model/constlabels"
"github.com/Kindling-project/kindling/collector/pkg/model/constnames"
)
const (
TcpMetric analyzer.Type = "tcpmetricanalyzer"
)
type TcpMetricAnalyzer struct {
consumers []consumer.Consumer
conntracker conntrackerpackge.Conntracker
telemetry *component.TelemetryTools
}
func NewTcpMetricAnalyzer(_ interface{}, telemetry *component.TelemetryTools, nextConsumers []consumer.Consumer) analyzer.Analyzer {
retAnalyzer := &TcpMetricAnalyzer{
consumers: nextConsumers,
telemetry: telemetry,
}
conntracker, err := conntrackerpackge.NewConntracker(nil)
if err != nil {
telemetry.Logger.Warn("Conntracker cannot work as expected:", zap.Error(err))
}
retAnalyzer.conntracker = conntracker
return retAnalyzer
}
func (a *TcpMetricAnalyzer) Start() error {
return nil
}
func (a *TcpMetricAnalyzer) ConsumableEvents() []string {
return []string{
constnames.TcpCloseEvent,
constnames.TcpRcvEstablishedEvent,
constnames.TcpDropEvent,
constnames.TcpRetransmitSkbEvent,
}
}
// ConsumeEvent gets the event from the previous component
func (a *TcpMetricAnalyzer) ConsumeEvent(event *model.KindlingEvent) error {
var dataGroup *model.DataGroup
var err error
switch event.Name {
case constnames.TcpCloseEvent:
fallthrough
case constnames.TcpRcvEstablishedEvent:
dataGroup, err = a.generateRtt(event)
case constnames.TcpDropEvent:
dataGroup, err = a.generateDrop(event)
case constnames.TcpRetransmitSkbEvent:
dataGroup, err = a.generateRetransmit(event)
default:
return nil
}
if err != nil {
if ce := a.telemetry.Logger.Check(zapcore.DebugLevel, "Event Skip, "); ce != nil {
ce.Write(
zap.Error(err),
)
}
return nil
}
if dataGroup == nil {
return nil
}
if ce := a.telemetry.Logger.Check(zapcore.DebugLevel, ""); ce != nil {
a.telemetry.Logger.Debug("TcpMetricAnalyzer To NextProcess:\n" + dataGroup.String())
}
var retError error
for _, nextConsumer := range a.consumers {
err := nextConsumer.Consume(dataGroup)
if err != nil {
retError = multierror.Append(retError, err)
}
}
return retError
}
func (a *TcpMetricAnalyzer) generateRtt(event *model.KindlingEvent) (*model.DataGroup, error) {
// Only client-side has rtt metric
labels, err := a.getTupleLabels(event)
if err != nil {
return nil, err
}
// Unit is microsecond
rtt := event.GetUintUserAttribute("rtt")
// rtt is zero when the kprobe is invoked in the first time, which should be filtered
if rtt == 0 {
return nil, nil
}
metric := model.NewIntMetric(constnames.TcpRttMetricName, int64(rtt))
return model.NewDataGroup(constnames.TcpRttMetricGroupName, labels, event.Timestamp, metric), nil
}
func (a *TcpMetricAnalyzer) generateRetransmit(event *model.KindlingEvent) (*model.DataGroup, error) {
labels, err := a.getTupleLabels(event)
if err != nil {
return nil, err
}
var segs = int64(1)
p_segs := event.GetUserAttribute("segs")
if p_segs != nil && p_segs.GetValueType() == model.ValueType_INT32 {
segs = p_segs.GetIntValue()
}
metric := model.NewIntMetric(constnames.TcpRetransmitMetricName, segs)
return model.NewDataGroup(constnames.TcpRetransmitMetricGroupName, labels, event.Timestamp, metric), nil
}
func (a *TcpMetricAnalyzer) generateDrop(event *model.KindlingEvent) (*model.DataGroup, error) {
labels, err := a.getTupleLabels(event)
if err != nil {
return nil, err
}
metric := model.NewIntMetric(constnames.TcpDropMetricName, 1)
return model.NewDataGroup(constnames.TcpDropMetricGroupName, labels, event.Timestamp, metric), nil
}
func (a *TcpMetricAnalyzer) getTupleLabels(event *model.KindlingEvent) (*model.AttributeMap, error) {
// Note: Here sIp/dIp doesn't mean IP from client/server side for sure.
// sIp stands for the IP which sends tcp flow.
sIp := event.GetUserAttribute("sip")
sPort := event.GetUserAttribute("sport")
dIp := event.GetUserAttribute("dip")
dPort := event.GetUserAttribute("dport")
if sIp == nil || sPort == nil || dIp == nil || dPort == nil {
return nil, fmt.Errorf("one of sip or dip or dport is nil for event %s", event.Name)
}
sIpString := model.IPLong2String(uint32(sIp.GetUintValue()))
sPortUint := sPort.GetUintValue()
dIpString := model.IPLong2String(uint32(dIp.GetUintValue()))
dPortUint := dPort.GetUintValue()
labels := model.NewAttributeMap()
labels.AddStringValue(constlabels.SrcIp, sIpString)
labels.AddIntValue(constlabels.SrcPort, int64(sPortUint))
labels.AddStringValue(constlabels.DstIp, dIpString)
labels.AddIntValue(constlabels.DstPort, int64(dPortUint))
dNatIp, dNatPort := a.findDNatTuple(sIpString, sPortUint, dIpString, dPortUint)
labels.AddStringValue(constlabels.DnatIp, dNatIp)
labels.AddIntValue(constlabels.DnatPort, dNatPort)
return labels, nil
}
func (a *TcpMetricAnalyzer) findDNatTuple(sIp string, sPort uint64, dIp string, dPort uint64) (string, int64) {
dNat := a.conntracker.GetDNATTupleWithString(sIp, dIp, uint16(sPort), uint16(dPort), 0)
if dNat == nil {
return "", -1
}
dNatIp := dNat.ReplSrcIP.String()
dNatPort := dNat.ReplSrcPort
return dNatIp, int64(dNatPort)
}
// Shutdown cleans all the resources used by the analyzer
func (a *TcpMetricAnalyzer) Shutdown() error {
return nil
}
// Type returns the type of the analyzer
func (a *TcpMetricAnalyzer) Type() analyzer.Type {
return TcpMetric
}