forked from brocaar/chirpstack-application-server
/
downlink.go
164 lines (142 loc) · 5.25 KB
/
downlink.go
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package downlink
import (
"encoding/json"
"fmt"
"github.com/jmoiron/sqlx"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"golang.org/x/net/context"
"github.com/brocaar/lora-app-server/internal/codec"
"github.com/brocaar/lora-app-server/internal/config"
"github.com/brocaar/lora-app-server/internal/eventlog"
"github.com/brocaar/lora-app-server/internal/handler"
"github.com/brocaar/lora-app-server/internal/storage"
"github.com/brocaar/loraserver/api/ns"
"github.com/brocaar/lorawan"
)
// HandleDataDownPayloads handles received downlink payloads to be emitted to the
// devices.
func HandleDataDownPayloads() {
for pl := range config.C.ApplicationServer.Integration.Handler.DataDownChan() {
go func(pl handler.DataDownPayload) {
if err := handleDataDownPayload(pl); err != nil {
log.WithFields(log.Fields{
"dev_eui": pl.DevEUI,
"application_id": pl.ApplicationID,
}).Errorf("handle data-down payload error: %s", err)
}
}(pl)
}
}
func handleDataDownPayload(pl handler.DataDownPayload) error {
return storage.Transaction(config.C.PostgreSQL.DB, func(tx sqlx.Ext) error {
// lock the device so that a concurrent Enqueue action will block
// until this transaction has been completed
d, err := storage.GetDevice(tx, pl.DevEUI, true, true)
if err != nil {
return fmt.Errorf("get device error: %s", err)
}
// Validate that the ApplicationID matches the actual DevEUI.
// This is needed as authorisation might be performed on MQTT topic level
// where it is unknown if the given ApplicationID matches the given
// DevEUI.
if d.ApplicationID != pl.ApplicationID {
return errors.New("enqueue downlink payload: device does not exist for given application")
}
// if Object is set, try to encode it to bytes using the application codec
if pl.Object != nil {
app, err := storage.GetApplication(tx, d.ApplicationID)
if err != nil {
return errors.Wrap(err, "get application error")
}
// get the codec payload configured for the application
codecPL := codec.NewPayload(app.PayloadCodec, pl.FPort, app.PayloadEncoderScript, app.PayloadDecoderScript)
if codecPL == nil {
logCodecError(app, d, errors.New("no or invalid codec configured for application"))
return errors.New("no or invalid codec configured for application")
}
err = json.Unmarshal(pl.Object, &codecPL)
if err != nil {
logCodecError(app, d, err)
return errors.Wrap(err, "unmarshal to codec payload error")
}
pl.Data, err = codecPL.EncodeToBytes()
if err != nil {
logCodecError(app, d, err)
return errors.Wrap(err, "marshal codec payload to binary error")
}
}
if _, err := EnqueueDownlinkPayload(tx, pl.DevEUI, pl.Confirmed, pl.FPort, pl.Data); err != nil {
return errors.Wrap(err, "enqueue downlink device-queue item error")
}
return nil
})
}
// EnqueueDownlinkPayload adds the downlink payload to the network-server
// device-queue.
func EnqueueDownlinkPayload(db sqlx.Ext, devEUI lorawan.EUI64, confirmed bool, fPort uint8, data []byte) (uint32, error) {
// get network-server and network-server api client
n, err := storage.GetNetworkServerForDevEUI(db, devEUI)
if err != nil {
return 0, errors.Wrap(err, "get network-server error")
}
nsClient, err := config.C.NetworkServer.Pool.Get(n.Server, []byte(n.CACert), []byte(n.TLSCert), []byte(n.TLSKey))
if err != nil {
return 0, errors.Wrap(err, "get network-server client error")
}
// get fCnt to use for encrypting and enqueueing
resp, err := nsClient.GetNextDownlinkFCntForDevEUI(context.Background(), &ns.GetNextDownlinkFCntForDevEUIRequest{
DevEui: devEUI[:],
})
if err != nil {
return 0, errors.Wrap(err, "get next downlink fcnt for deveui error")
}
// get current device-activation for AppSKey
da, err := storage.GetLastDeviceActivationForDevEUI(db, devEUI)
if err != nil {
return 0, errors.Wrap(err, "get last device-activation error")
}
// encrypt payload
b, err := lorawan.EncryptFRMPayload(da.AppSKey, false, da.DevAddr, resp.FCnt, data)
if err != nil {
return 0, errors.Wrap(err, "encrypt frmpayload error")
}
// enqueue device-queue item
_, err = nsClient.CreateDeviceQueueItem(context.Background(), &ns.CreateDeviceQueueItemRequest{
Item: &ns.DeviceQueueItem{
DevEui: devEUI[:],
FrmPayload: b,
FCnt: resp.FCnt,
FPort: uint32(fPort),
Confirmed: confirmed,
},
})
if err != nil {
return 0, errors.Wrap(err, "create device-queue item error")
}
log.WithFields(log.Fields{
"f_cnt": resp.FCnt,
"dev_eui": devEUI,
"confirmed": confirmed,
}).Info("downlink device-queue item handled")
return resp.FCnt, nil
}
func logCodecError(a storage.Application, d storage.Device, err error) {
errNotification := handler.ErrorNotification{
ApplicationID: a.ID,
ApplicationName: a.Name,
DeviceName: d.Name,
DevEUI: d.DevEUI,
Type: "CODEC",
Error: err.Error(),
}
if err := eventlog.LogEventForDevice(d.DevEUI, eventlog.EventLog{
Type: eventlog.Error,
Payload: errNotification,
}); err != nil {
log.WithError(err).Error("log event for device error")
}
if err := config.C.ApplicationServer.Integration.Handler.SendErrorNotification(errNotification); err != nil {
log.WithError(err).Error("send error notification to handler error")
}
}