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frontend.go
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frontend.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mock
import (
"context"
"time"
"go.thethings.network/lorawan-stack/v3/pkg/gatewayserver/io"
"go.thethings.network/lorawan-stack/v3/pkg/gatewayserver/scheduling"
"go.thethings.network/lorawan-stack/v3/pkg/ttnpb"
"google.golang.org/protobuf/types/known/timestamppb"
)
// Frontend is a mock front-end.
type Frontend struct {
Up chan *ttnpb.UplinkMessage
Status chan *ttnpb.GatewayStatus
TxAck chan *ttnpb.TxAcknowledgment
Down chan *ttnpb.DownlinkMessage
}
func (*Frontend) Protocol() string { return "mock" }
func (*Frontend) SupportsDownlinkClaim() bool { return true }
func (*Frontend) DutyCycleStyle() scheduling.DutyCycleStyle { return scheduling.DefaultDutyCycleStyle }
// ConnectFrontend connects a new mock front-end to the given server.
// The gateway time starts at Unix epoch.
func ConnectFrontend(ctx context.Context, ids *ttnpb.GatewayIdentifiers, server io.Server) (*Frontend, error) {
f := &Frontend{
Up: make(chan *ttnpb.UplinkMessage, 1),
Status: make(chan *ttnpb.GatewayStatus, 1),
TxAck: make(chan *ttnpb.TxAcknowledgment, 1),
Down: make(chan *ttnpb.DownlinkMessage, 1),
}
conn, err := server.Connect(ctx, f, ids, &ttnpb.GatewayRemoteAddress{Ip: "127.0.0.1"})
if err != nil {
return nil, err
}
started := time.Now()
go func() {
for {
select {
case <-ctx.Done():
return
case up := <-f.Up:
gatewayTime := time.Unix(0, 0).Add(time.Since(started))
up.ReceivedAt = timestamppb.Now()
for _, md := range up.RxMetadata {
md.GpsTime = timestamppb.New(gatewayTime)
}
conn.HandleUp(up, nil)
case status := <-f.Status:
conn.HandleStatus(status)
case txAck := <-f.TxAck:
conn.HandleTxAck(txAck)
}
}
}()
go func() {
for {
select {
case <-ctx.Done():
return
case down := <-conn.Down():
f.Down <- down
}
}
}()
return f, nil
}