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eventlogmanager.go
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eventlogmanager.go
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package logging
import (
"fmt"
"log"
"net"
"os"
"sync"
"time"
"github.com/google/uuid"
)
type EventLogManager interface {
CreateEvent(timestamp time.Time, servicename string, methodname string, ipsource string, tcpsource uint16, ipdest string, tcpdest uint16) string
InsertResponse(timestamp time.Time, ipsource string, tcpsource uint16, ipdest string, tcpdest uint16, grpcstatuscode string) string
CleanupExpiredRequests()
Stop()
}
type eventLogManager struct {
events []*EventLog
tticker *time.Ticker
timeout time.Duration
mutex sync.RWMutex
file *os.File
cidr *net.IPNet
}
func NewEventLogManager(t time.Duration, f *os.File, cidr *net.IPNet) EventLogManager {
log.Printf("Printing logs to %s.\n", f.Name())
return &eventLogManager{timeout: t, tticker: time.NewTicker(t), file: f, cidr: cidr}
}
// TODO: Print all remaining events as timeout
func (m *eventLogManager) Stop() {
m.tticker.Stop()
}
func (m *eventLogManager) CreateEvent(timestamp time.Time, servicename string, methodname string, ipsource string, tcpsource uint16, ipdest string, tcpdest uint16) string {
e := NewEventLog(timestamp, servicename, methodname, ipsource, tcpsource, ipdest, tcpdest, "Request")
m.addEvent(e)
return logString(*e)
}
func (m *eventLogManager) InsertResponse(timestamp time.Time, ipsource string, tcpsource uint16, ipdest string, tcpdest uint16, grpcstatuscode string) string {
var event *EventLog
var idx int
event, idx = m.getEvent(ipdest, tcpdest)
if idx == -1 {
event = NewEventLog(time.Time{}, "NULL", "NULL", ipdest, tcpdest, ipsource, tcpsource, "NO REQUEST")
} else {
m.removeEvent(event.id)
}
event.insertResponse(timestamp, grpcstatuscode, " - Response")
return m.printEvent(*event) // Consider spawn goroutine
}
func (m *eventLogManager) getEvent(ipdest string, tcpdest uint16) (event *EventLog, idx int) {
m.mutex.RLock()
defer m.mutex.RUnlock()
for i, event := range m.events {
if event.isMatchingRequest(ipdest, tcpdest) {
return event, i
}
}
return nil, -1
}
func (m *eventLogManager) addEvent(event *EventLog) {
m.mutex.Lock()
m.events = append(m.events, event)
m.mutex.Unlock()
}
func (m *eventLogManager) removeEvent(id uuid.UUID) {
m.mutex.Lock()
defer m.mutex.Unlock()
var idx int
var event *EventLog
found := false
for idx, event = range m.events {
if event.id == id {
found = true
break
}
}
if found {
m.events = append(m.events[:idx], m.events[idx+1:]...)
}
}
func (m *eventLogManager) CleanupExpiredRequests() {
for currtime := range m.tticker.C {
m.cleanup(currtime)
}
}
func (m *eventLogManager) cleanup(t time.Time) {
expiredevents := m.expiredEvents(t)
m.removeEvents(expiredevents)
m.printEvents(expiredevents)
}
// This should return the events in the same order with events in the array
func (m *eventLogManager) expiredEvents(currtime time.Time) []*EventLog {
m.mutex.RLock()
defer m.mutex.RUnlock()
expiredevents := []*EventLog{}
for _, event := range m.events {
if currtime.Sub(event.tstart) >= m.timeout {
event.insertResponse(currtime, "-1", " - TIMEOUT")
expiredevents = append(expiredevents, event)
}
}
return expiredevents
}
// This should remove the records in order
func (m *eventLogManager) removeEvents(events []*EventLog) {
m.mutex.Lock()
defer m.mutex.Unlock()
idx := 0
for _, rmevent := range events {
for idx < len(m.events) {
if m.events[idx].id == rmevent.id {
m.events = append(m.events[:idx], m.events[idx+1:]...)
break
} else {
idx++
}
}
}
}
func logString(e EventLog) string {
grpcstatuscode := "-1"
if e.grpcstatuscode != "" {
grpcstatuscode = e.grpcstatuscode
}
return fmt.Sprintf("%s,%s,%s,%d,%s,%d,%s,%d,%s\n", e.servicename, e.methodname, e.ipsource, e.tcpsource, e.ipdest, e.tcpdest, grpcstatuscode, e.duration, e.info)
}
func (m *eventLogManager) printEvent(e EventLog) string {
if m.cidr.Contains(net.ParseIP(e.ipsource)) {
m.file.WriteString(logString(e))
return logString(e)
}
return ""
}
func (m *eventLogManager) printEvents(events []*EventLog) {
for _, event := range events {
m.printEvent(*event)
}
}