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convert_metadata.go
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convert_metadata.go
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// Copyright © 2017 The Things Network
// Use of this source code is governed by the MIT license that can be found in the LICENSE file.
package handler
import (
pb_broker "github.com/TheThingsNetwork/ttn/api/broker"
"github.com/TheThingsNetwork/ttn/core/handler/device"
"github.com/TheThingsNetwork/ttn/core/types"
"github.com/apex/log"
)
// ConvertMetadata converts the protobuf matadata to application metadata
func (h *handler) ConvertMetadata(ctx log.Interface, ttnUp *pb_broker.DeduplicatedUplinkMessage, appUp *types.UplinkMessage, dev *device.Device) error {
ctx = ctx.WithField("NumGateways", len(ttnUp.GatewayMetadata))
// Transform Metadata
appUp.Metadata.Time = types.BuildTime(ttnUp.ServerTime)
if lorawan := ttnUp.ProtocolMetadata.GetLorawan(); lorawan != nil {
appUp.Metadata.Modulation = lorawan.Modulation.String()
appUp.Metadata.DataRate = lorawan.DataRate
appUp.Metadata.Bitrate = lorawan.BitRate
appUp.Metadata.CodingRate = lorawan.CodingRate
}
// Transform Gateway Metadata
appUp.Metadata.Gateways = make([]types.GatewayMetadata, 0, len(ttnUp.GatewayMetadata))
for i, in := range ttnUp.GatewayMetadata {
// Same for all gateways, take first one
if i == 0 {
appUp.Metadata.Frequency = float32(float64(in.Frequency) / 1000000)
}
gatewayMetadata := types.GatewayMetadata{
GtwID: in.GatewayId,
GtwTrusted: in.GatewayTrusted,
Timestamp: in.Timestamp,
Time: types.BuildTime(in.Time),
Channel: in.Channel,
RFChain: in.RfChain,
RSSI: in.Rssi,
SNR: in.Snr,
}
if gps := in.GetGps(); gps != nil {
gatewayMetadata.Altitude = gps.Altitude
gatewayMetadata.Longitude = gps.Longitude
gatewayMetadata.Latitude = gps.Latitude
}
appUp.Metadata.Gateways = append(appUp.Metadata.Gateways, gatewayMetadata)
}
// Inject Device Metadata
appUp.Metadata.LocationMetadata.Latitude = dev.Latitude
appUp.Metadata.LocationMetadata.Longitude = dev.Longitude
appUp.Metadata.LocationMetadata.Altitude = dev.Altitude
return nil
}