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Metric.go
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Metric.go
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package flows
import (
"analysis/flows"
"analysis/metrics/common"
"encoding/json"
"fmt"
"github.com/dustin/go-humanize"
"os"
"path"
"time"
)
type Metric struct {
computeRRPs bool
rrIdentifier *common.ReqResIdentifier
exportChannel chan *string
doneChannel chan bool
metrics []registrableMetric
rrMetrics []registrableRRMetric
}
type ExportableValue interface {
export() map[string]interface{}
}
type registrableMetric interface {
onFlush(flow *flows.Flow) ExportableValue
}
type registrableRRMetric interface {
onFlush(flow *flows.Flow, reqRes []*common.RequestResponse) ExportableValue
}
func NewMetric(samplingRate int64, computeRRPs bool, exportBufferSize uint) *Metric {
metric := &Metric{
computeRRPs: computeRRPs,
exportChannel: make(chan *string, exportBufferSize),
doneChannel: make(chan bool),
}
metricFlowRate := newMetricFlowRate()
metricFlowRate.samplingRate = samplingRate
metric.addMetric(metricFlowRate)
metric.addMetric(newMetricProtocol())
metric.addMetric(newMetricFlowSize())
metric.addMetric(newMetricPackets())
metric.addMetric(newMetricFlowDuration())
if !computeRRPs {
return metric
}
metric.rrIdentifier = common.NewReqResIdentifier(
false, false,
nil, nil,
)
metric.addRRMetric(newMetricRRPs())
return metric
}
func (m *Metric) addMetric(metric registrableMetric) {
m.metrics = append(m.metrics, metric)
}
func (m *Metric) addRRMetric(rrMetric registrableRRMetric) {
m.rrMetrics = append(m.rrMetrics, rrMetric)
}
// Callback that is called by the pools, once reconstruction for a flow is done.
// This means that this method runs concurrently.
func (m *Metric) OnTCPFlush(flow *flows.TCPFlow) {
var protocol = common.GetProtocol(&flow.Flow)
var rr = make([]*common.RequestResponse, 0)
var dropFlow bool
if m.computeRRPs {
rr, dropFlow = m.rrIdentifier.OnTCPFlush(protocol, flow)
if dropFlow {
return
}
}
m.onFlush(&flow.Flow, rr)
}
// Callback that is called by the pools, once reconstruction for a flow is done.
// This means that this method runs concurrently.
func (m *Metric) OnUDPFlush(flow *flows.UDPFlow) {
var protocol = common.GetProtocol(&flow.Flow)
var rr = make([]*common.RequestResponse, 0)
var dropFlow bool
if m.computeRRPs {
rr, dropFlow = m.rrIdentifier.OnUDPFlush(protocol, flow)
if dropFlow {
return
}
}
m.onFlush(&flow.Flow, rr)
}
// This method is called by the callback. Simplifies metric implementation, as
// they are not required to implement different methods for TCP/UDP.
func (m *Metric) onFlush(flow *flows.Flow, rr []*common.RequestResponse) {
values := make([]ExportableValue, len(m.metrics)+len(m.rrMetrics))
for i, metric := range m.metrics {
values[i] = metric.onFlush(flow)
}
if m.computeRRPs {
for i, rrMetric := range m.rrMetrics {
values[len(m.metrics)+i] = rrMetric.onFlush(flow, rr)
}
}
combinedMetric := combineMetrics(values)
m.exportChannel <- serializeMetric(combinedMetric)
}
// Combines metrics that have been computed independently into one.
func combineMetrics(values []ExportableValue) *map[string]interface{} {
combinedMetric := make(map[string]interface{})
for _, value := range values {
for key, value := range value.export() {
combinedMetric[key] = value
}
}
return &combinedMetric
}
// Serializes a combined metric into a JSON string.
func serializeMetric(metric *map[string]interface{}) *string {
b, err := json.Marshal(metric)
if err != nil {
fmt.Println(err.Error())
panic("Error during json marshalling!")
}
serialized := string(b)
return &serialized
}
// Closes the exportChannel, which causes all buffered metrics to be flushed.
func (m *Metric) Flush() {
close(m.exportChannel)
}
// Waits until all metrics have been written to file.
func (m *Metric) Wait() {
<-m.doneChannel
}
// Should always be called as a goroutine. Writes serialized metrics directly to disk.
func (m *Metric) ExportRoutine(directory string) {
filename := path.Join(directory, "flow_metrics.json")
if _, err := os.Stat(filename); err == nil {
// File exists
err := os.Remove(filename)
if err != nil {
fmt.Println(err.Error())
panic("Could not remove '" + filename + "'!")
}
}
f, err := os.Create(filename)
if err != nil {
fmt.Println(err.Error())
panic("Could not create '" + filename + "'!")
}
err = os.Chmod(filename, 0644)
if err != nil {
fmt.Println(err.Error())
fmt.Println("Could not change permissions for '" + filename + "'!")
}
fmt.Println("Export routine successfully setup.")
start := time.Now()
_, err = f.WriteString("{")
if err != nil {
fmt.Println(err.Error())
panic("Error writing to file!")
}
id := 0
serializedMetric := ""
for serializedMetricPointer := range m.exportChannel {
if len(serializedMetric) != 0 {
_, err = f.WriteString(fmt.Sprintf("\"%d\":%s,", id, serializedMetric))
if err != nil {
fmt.Println(err.Error())
panic("Error writing to file!")
}
}
serializedMetric = *serializedMetricPointer
id++
}
_, err = f.WriteString(fmt.Sprintf("\"%d\":%s}", id, serializedMetric))
if err != nil {
fmt.Println(err.Error())
panic("Error writing to file!")
}
err = f.Close()
if err != nil {
fmt.Println(err.Error())
panic("Error closing file!")
}
fmt.Println("Finished writing json. Took:\t", time.Since(start))
fmt.Printf("Export successful. Exported:\t %s flow metrics", humanize.Comma(int64(id)))
m.doneChannel <- true
close(m.doneChannel)
}