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package bpf
import (
"context"
"errors"
"log"
"net"
"os"
"os/signal"
"syscall"
"time"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/link"
"github.com/jackc/pgx/v5/pgtype"
"sinanmohd.com/redq/db"
)
type UsageStat struct {
lastSeen time.Time
lastDbPush time.Time
bandwidthIngress uint64
bandwidthEgress uint64
ingress uint64
egress uint64
}
type UsageMap map[uint64]UsageStat
func Run(iface *net.Interface, queries *db.Queries, ctxDb context.Context) {
usageMap := make(UsageMap)
objs := bpfObjects{}
if err := loadBpfObjects(&objs, nil); err != nil {
log.Fatalf("loading objects: %s", err)
}
defer objs.Close()
ingressLink, err := link.AttachTCX(link.TCXOptions{
Interface: iface.Index,
Program: objs.IngressFunc,
Attach: ebpf.AttachTCXIngress,
})
if err != nil {
log.Fatalf("could not attach TCx program: %s", err)
}
defer ingressLink.Close()
egressLink, err := link.AttachTCX(link.TCXOptions{
Interface: iface.Index,
Program: objs.EgressFunc,
Attach: ebpf.AttachTCXEgress,
})
if err != nil {
log.Fatalf("could not attach TCx program: %s", err)
}
defer egressLink.Close()
bpfTicker := time.NewTicker(time.Second)
defer bpfTicker.Stop()
dbTicker := time.NewTicker(time.Minute)
defer dbTicker.Stop()
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, os.Interrupt, os.Kill, syscall.SIGTERM)
for {
select {
case <-bpfTicker.C:
err := usageMap.update(objs.IngressIp4UsageMap, objs.EgressIp4UsageMap)
if err != nil {
log.Printf("updating usageMap: %s", err)
}
case <-sigs:
err := usageMap.updateDb(queries, ctxDb, false)
if err != nil {
log.Printf("updating Database: %s", err)
}
os.Exit(0)
case <-dbTicker.C:
err := usageMap.updateDb(queries, ctxDb, true)
if err != nil {
log.Printf("updating Database: %s", err)
}
}
}
}
func (usageStat UsageStat) expired(timeStart *time.Time) bool {
timeDiff := timeStart.Sub(usageStat.lastSeen)
if timeDiff > time.Minute {
return true
}
timeDiff = timeStart.Sub(usageStat.lastDbPush)
if timeDiff > time.Hour {
return true
}
return false
}
func (usageMap UsageMap) updateDb(queries *db.Queries, ctxDb context.Context, ifExpired bool) error {
timeStart := time.Now()
for key, value := range usageMap {
if ifExpired && !value.expired(&timeStart) {
continue
}
err := queries.EnterUsage(ctxDb, db.EnterUsageParams{
Hardwareaddr: int64(key),
Starttime: pgtype.Timestamp{
Time: value.lastDbPush,
Valid: true,
},
Stoptime: pgtype.Timestamp{
Time: value.lastSeen,
Valid: true,
},
Egress: int64(value.egress),
Ingress: int64(value.ingress),
})
if err != nil {
return err
}
delete(usageMap, key)
}
return nil
}
func (usageMap UsageMap) update(ingress *ebpf.Map, egress *ebpf.Map) error {
timeStart := time.Now()
batchKeys := make([]uint64, 4096)
batchValues := make([]uint64, 4096)
var key uint64
cursor := ebpf.MapBatchCursor{}
for {
_, err := ingress.BatchLookupAndDelete(&cursor, batchKeys, batchValues, nil)
for i := range batchKeys {
/* TODO: maybe BatchLookupAndDelete is not the best idea with mostly empty map */
if batchValues[i] == 0 {
continue
}
key = batchKeys[i]
usage, ok := usageMap[key]
if ok {
usage.bandwidthIngress = batchValues[i] - usage.ingress
usage.ingress += batchValues[i]
usage.lastSeen = timeStart
usageMap[key] = usage
} else {
usageMap[key] = UsageStat{
bandwidthIngress: batchValues[i],
ingress: batchValues[i],
lastDbPush: timeStart,
lastSeen: timeStart,
}
}
}
if errors.Is(err, ebpf.ErrKeyNotExist) {
break
} else if err != nil {
return err
}
}
cursor = ebpf.MapBatchCursor{}
for {
_, err := egress.BatchLookupAndDelete(&cursor, batchKeys, batchValues, nil)
for i := range batchKeys {
/* TODO: maybe BatchLookupAndDelete is not the best idea with mostly empty map */
if batchValues[i] == 0 {
continue
}
key = batchKeys[i]
usage, ok := usageMap[key]
if ok {
usage.bandwidthEgress = batchValues[i] - usage.egress
usage.egress += batchValues[i]
usage.lastSeen = timeStart
usageMap[key] = usage
} else {
usageMap[key] = UsageStat{
bandwidthEgress: batchValues[i],
egress: batchValues[i],
lastDbPush: timeStart,
lastSeen: timeStart,
}
}
}
if errors.Is(err, ebpf.ErrKeyNotExist) {
break
} else if err != nil {
return err
}
}
return nil
}
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