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package usage
import (
"context"
"errors"
"log"
"net"
"sync"
"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
type Usage struct {
Data usageMap
Mutex sync.Mutex
objs bpfObjects
egressLink, ingressLink link.Link
}
func Close(u *Usage, queries *db.Queries, ctxDb context.Context) {
err := u.UpdateDb(queries, ctxDb, false)
if err != nil {
log.Printf("updating Database: %s", err)
}
u.objs.Close()
u.ingressLink.Close()
u.egressLink.Close()
}
func New(iface *net.Interface) (*Usage, error) {
var err error
var u Usage
if err := loadBpfObjects(&u.objs, nil); err != nil {
log.Printf("loading objects: %s", err)
return nil, err
}
defer func() {
if err != nil {
u.objs.Close()
}
}()
u.ingressLink, err = link.AttachTCX(link.TCXOptions{
Interface: iface.Index,
Program: u.objs.IngressFunc,
Attach: ebpf.AttachTCXIngress,
})
if err != nil {
log.Printf("could not attach TCx program: %s", err)
return nil, err
}
defer func() {
if err != nil {
u.ingressLink.Close()
}
}()
u.egressLink, err = link.AttachTCX(link.TCXOptions{
Interface: iface.Index,
Program: u.objs.EgressFunc,
Attach: ebpf.AttachTCXEgress,
})
if err != nil {
log.Printf("could not attach TCx program: %s", err)
return nil, err
}
u.Data = make(usageMap)
return &u, nil
}
func (u *Usage) Run(iface *net.Interface, queries *db.Queries, ctxDb context.Context) {
bpfTicker := time.NewTicker(time.Second)
defer bpfTicker.Stop()
dbTicker := time.NewTicker(time.Minute)
defer dbTicker.Stop()
for {
select {
case <-bpfTicker.C:
err := u.update(u.objs.IngressIp4UsageMap, u.objs.EgressIp4UsageMap)
if err != nil {
log.Printf("updating usageMap: %s", err)
}
case <-dbTicker.C:
err := u.UpdateDb(queries, ctxDb, true)
if err != nil {
log.Printf("updating Database: %s", err)
}
}
}
}
func (u *Usage) UpdateDb(queries *db.Queries, ctxDb context.Context, ifExpired bool) error {
timeStart := time.Now()
u.Mutex.Lock()
for key, value := range u.Data {
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(u.Data, key)
}
u.Mutex.Unlock()
return nil
}
func (us *usageStat) expired(timeStart *time.Time) bool {
timeDiff := timeStart.Sub(us.lastSeen)
if timeDiff > time.Minute {
return true
}
timeDiff = timeStart.Sub(us.lastDbPush)
if timeDiff > time.Hour {
return true
}
return false
}
func (u *Usage) 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]
u.Mutex.Lock()
usage, ok := u.Data[key]
if ok {
usage.BandwidthIngress = batchValues[i] - usage.Ingress
usage.Ingress += batchValues[i]
usage.lastSeen = timeStart
u.Data[key] = usage
} else {
u.Data[key] = usageStat{
BandwidthIngress: batchValues[i],
Ingress: batchValues[i],
lastDbPush: timeStart,
lastSeen: timeStart,
}
}
u.Mutex.Unlock()
}
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]
u.Mutex.Lock()
usage, ok := u.Data[key]
if ok {
usage.BandwidthEgress = batchValues[i] - usage.Egress
usage.Egress += batchValues[i]
usage.lastSeen = timeStart
u.Data[key] = usage
} else {
u.Data[key] = usageStat{
BandwidthEgress: batchValues[i],
Egress: batchValues[i],
lastDbPush: timeStart,
lastSeen: timeStart,
}
}
u.Mutex.Unlock()
}
if errors.Is(err, ebpf.ErrKeyNotExist) {
break
} else if err != nil {
return err
}
}
return nil
}
|
