forked from brocaar/chirpstack-network-server
/
multicast.go
200 lines (165 loc) · 5.28 KB
/
multicast.go
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package multicast
import (
"crypto/rand"
"encoding/binary"
"github.com/golang/protobuf/ptypes"
"github.com/jmoiron/sqlx"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"github.com/brocaar/loraserver/api/gw"
"github.com/brocaar/loraserver/internal/config"
"github.com/brocaar/loraserver/internal/framelog"
"github.com/brocaar/loraserver/internal/helpers"
"github.com/brocaar/loraserver/internal/storage"
"github.com/brocaar/lorawan"
)
var errAbort = errors.New("")
type multicastContext struct {
Token uint16
DB sqlx.Ext
MulticastGroup storage.MulticastGroup
MulticastQueueItem storage.MulticastQueueItem
TXInfo gw.DownlinkTXInfo
PHYPayload lorawan.PHYPayload
}
var multicastTasks = []func(*multicastContext) error{
getMulticastGroup,
setToken,
removeQueueItem,
validatePayloadSize,
setTXInfo,
setPHYPayload,
sendDownlinkData,
}
// HandleScheduleNextQueueItem handles the scheduling of the next queue-item
// for the given multicast-group.
func HandleScheduleNextQueueItem(db sqlx.Ext, mg storage.MulticastGroup) error {
ctx := multicastContext{
DB: db,
MulticastGroup: mg,
}
for _, t := range multicastTasks {
if err := t(&ctx); err != nil {
if err == errAbort {
return nil
}
return err
}
}
return nil
}
// HandleScheduleQueueItem handles the scheduling of the given queue-item.
func HandleScheduleQueueItem(db sqlx.Ext, qi storage.MulticastQueueItem) error {
ctx := multicastContext{
DB: db,
MulticastQueueItem: qi,
}
for _, t := range multicastTasks {
if err := t(&ctx); err != nil {
if err == errAbort {
return nil
}
return err
}
}
return nil
}
func getMulticastGroup(ctx *multicastContext) error {
var err error
ctx.MulticastGroup, err = storage.GetMulticastGroup(ctx.DB, ctx.MulticastQueueItem.MulticastGroupID, false)
if err != nil {
return errors.Wrap(err, "get multicast-group error")
}
return nil
}
func setToken(ctx *multicastContext) error {
b := make([]byte, 2)
_, err := rand.Read(b)
if err != nil {
return errors.Wrap(err, "read random error")
}
ctx.Token = binary.BigEndian.Uint16(b)
return nil
}
func removeQueueItem(ctx *multicastContext) error {
if err := storage.DeleteMulticastQueueItem(ctx.DB, ctx.MulticastQueueItem.ID); err != nil {
return errors.Wrap(err, "delete multicast queue-item error")
}
return nil
}
func validatePayloadSize(ctx *multicastContext) error {
maxSize, err := config.C.NetworkServer.Band.Band.GetMaxPayloadSizeForDataRateIndex("", "", ctx.MulticastGroup.DR)
if err != nil {
return errors.Wrap(err, "get max payload-size for data-rate index error")
}
if len(ctx.MulticastQueueItem.FRMPayload) > maxSize.N {
log.WithFields(log.Fields{
"multicast_group_id": ctx.MulticastGroup.ID,
"dr": ctx.MulticastGroup.DR,
"max_frm_payload_size": maxSize.N,
"frm_payload_size": len(ctx.MulticastQueueItem.FRMPayload),
}).Error("payload exceeds max size for data-rate")
return errAbort
}
return nil
}
func setTXInfo(ctx *multicastContext) error {
txInfo := gw.DownlinkTXInfo{
GatewayId: ctx.MulticastQueueItem.GatewayID[:],
Immediately: ctx.MulticastQueueItem.EmitAtTimeSinceGPSEpoch == nil,
Frequency: uint32(ctx.MulticastGroup.Frequency),
}
if ctx.MulticastQueueItem.EmitAtTimeSinceGPSEpoch != nil {
txInfo.TimeSinceGpsEpoch = ptypes.DurationProto(*ctx.MulticastQueueItem.EmitAtTimeSinceGPSEpoch)
}
if err := helpers.SetDownlinkTXInfoDataRate(&txInfo, ctx.MulticastGroup.DR, config.C.NetworkServer.Band.Band); err != nil {
return errors.Wrap(err, "set data-rate error")
}
if config.C.NetworkServer.NetworkSettings.DownlinkTXPower != -1 {
txInfo.Power = int32(config.C.NetworkServer.NetworkSettings.DownlinkTXPower)
} else {
txInfo.Power = int32(config.C.NetworkServer.Band.Band.GetDownlinkTXPower(ctx.MulticastGroup.Frequency))
}
ctx.TXInfo = txInfo
return nil
}
func setPHYPayload(ctx *multicastContext) error {
ctx.PHYPayload = lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.UnconfirmedDataDown,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.MACPayload{
FHDR: lorawan.FHDR{
DevAddr: ctx.MulticastGroup.MCAddr,
FCnt: ctx.MulticastQueueItem.FCnt,
},
FPort: &ctx.MulticastQueueItem.FPort,
FRMPayload: []lorawan.Payload{&lorawan.DataPayload{Bytes: ctx.MulticastQueueItem.FRMPayload}},
},
}
// using LoRaWAN1_0 vs LoRaWAN1_1 only makes a difference when setting the
// confirmed frame-counter
if err := ctx.PHYPayload.SetDownlinkDataMIC(lorawan.LoRaWAN1_1, 0, ctx.MulticastGroup.MCNwkSKey); err != nil {
return errors.Wrap(err, "set downlink data mic error")
}
return nil
}
func sendDownlinkData(ctx *multicastContext) error {
phyB, err := ctx.PHYPayload.MarshalBinary()
if err != nil {
return errors.Wrap(err, "marshal phypayload error")
}
downlinkFrame := gw.DownlinkFrame{
Token: uint32(ctx.Token),
TxInfo: &ctx.TXInfo,
PhyPayload: phyB,
}
if err := config.C.NetworkServer.Gateway.Backend.Backend.SendTXPacket(downlinkFrame); err != nil {
return errors.Wrap(err, "send downlink frame to gateway error")
}
if err := framelog.LogDownlinkFrameForGateway(config.C.Redis.Pool, downlinkFrame); err != nil {
log.WithError(err).Error("log downlink frame for gateway error")
}
return nil
}