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package main
import (
"context"
"errors"
"fmt"
"net/url"
"time"
"github.com/charmbracelet/log"
"github.com/eclipse/paho.golang/autopaho"
"github.com/eclipse/paho.golang/paho"
"github.com/meshnet-gophers/meshtastic-go"
pb "github.com/meshnet-gophers/meshtastic-go/meshtastic"
"github.com/meshnet-gophers/meshtastic-go/radio"
"google.golang.org/protobuf/proto"
)
// Implements MeshIf
type MqttIf struct {
Address string
Username string
Password string
ClientID string
Root string
GatewayID meshtastic.NodeID
Channels *pb.ChannelSet
logger *log.Logger
c *autopaho.ConnectionManager
ctx context.Context
stop context.CancelFunc
inputCh chan mqttServiceEnvelope
chIdMap map[string]uint8
}
type mqttServiceEnvelope struct {
timestamp time.Time
se *pb.ServiceEnvelope
}
func NewMqttIf(address string, username, password, root, clientID string, gatewayID meshtastic.NodeID, channels *pb.ChannelSet) *MqttIf {
logger := log.WithPrefix("MqttIf")
inputCh := make(chan mqttServiceEnvelope, 10)
return &MqttIf{
Address: address,
Username: username,
Password: password,
ClientID: clientID,
Root: root,
GatewayID: gatewayID,
Channels: channels,
logger: logger,
inputCh: inputCh,
}
}
func (m *MqttIf) channelPublishTopic(channelId string) string {
return fmt.Sprintf("%s/2/e/%s/%s", m.Root, channelId, m.GatewayID)
}
func (m *MqttIf) onConnectionUp(cm *autopaho.ConnectionManager, connAck *paho.Connack) {
topics := []string{fmt.Sprintf("%s/2/e/PKI/#", m.Root)}
chIdMap := make(map[string]uint8)
for _, c := range m.Channels.Settings {
topics = append(topics, fmt.Sprintf("%s/2/e/%s/#", m.Root, c.Name))
channelHash, err := radio.ChannelHash(c.Name, c.Psk)
if err != nil {
m.logger.Errorf("failed to build channel hash: %s", err)
m.c.Disconnect(m.ctx)
return
}
chIdMap[c.Name] = uint8(channelHash)
}
m.chIdMap = chIdMap
subscriptions := make([]paho.SubscribeOptions, 0, len(topics))
for _, t := range topics {
subscriptions = append(subscriptions, paho.SubscribeOptions{Topic: t, QoS: 1})
}
if _, err := cm.Subscribe(m.ctx, &paho.Subscribe{Subscriptions: subscriptions}); err != nil {
m.logger.Errorf("failed to subscribe (%s). This is likely to mean no messages will be received.", err)
m.c.Disconnect(m.ctx)
return
}
m.logger.Info("Subscribed", "topics", topics)
}
func (m *MqttIf) onConnectionError(err error) {
m.logger.Warnf("error whilst attempting connection: %s\n", err)
}
func (m *MqttIf) onReceive(pr paho.PublishReceived) (bool, error) {
if pr.Packet.Duplicate() || pr.AlreadyHandled {
return false, nil
}
se := &pb.ServiceEnvelope{}
if err := proto.Unmarshal(pr.Packet.Payload, se); err != nil {
return false, fmt.Errorf("unmarshalling ServicePayload from Mqtt: %w", err)
}
if se.Packet.RxTime == 0 {
se.Packet.RxTime = uint32(time.Now().Unix())
}
m.inputCh <- mqttServiceEnvelope{timestamp: time.Now(), se: se}
return true, nil
}
func (m *MqttIf) onClientError(err error) {
m.logger.Warnf("client error: %s\n", err)
}
func (m *MqttIf) onServerDisconnect(d *paho.Disconnect) {
if d.Properties != nil {
fmt.Printf("server requested disconnect: %s\n", d.Properties.ReasonString)
} else {
fmt.Printf("server requested disconnect; reason code: %d\n", d.ReasonCode)
}
}
func (m *MqttIf) Open() error {
m.ctx, m.stop = context.WithCancel(context.Background())
u, err := url.Parse(m.Address)
if err != nil {
return err
}
cliCfg := autopaho.ClientConfig{
ServerUrls: []*url.URL{u},
KeepAlive: 20, // Keepalive message should be sent every 20 seconds
CleanStartOnInitialConnection: false,
SessionExpiryInterval: 60,
OnConnectionUp: m.onConnectionUp,
OnConnectError: m.onConnectionError,
ConnectUsername: m.Username,
ConnectPassword: []byte(m.Password),
ClientConfig: paho.ClientConfig{
ClientID: m.ClientID,
OnPublishReceived: []func(paho.PublishReceived) (bool, error){m.onReceive},
OnClientError: m.onClientError,
OnServerDisconnect: m.onServerDisconnect,
},
}
m.c, err = autopaho.NewConnection(m.ctx, cliCfg) // starts process; will reconnect until context cancelled
if err != nil {
return err
}
if err = m.c.AwaitConnection(m.ctx); err != nil {
return err
}
return nil
}
func (m *MqttIf) Close() error {
m.logger.Info("Closing MQTT connection...")
m.c.Disconnect(m.ctx)
m.stop()
close(m.inputCh)
<-m.ctx.Done()
return nil
}
func (m *MqttIf) ReadMeshPacket() (*pb.MeshPacket, uint64, error) {
if err := m.ctx.Err(); err != nil {
return nil, 0, err
}
p := <-m.inputCh
if p.se == nil || p.se.Packet == nil {
return nil, 0, errors.New("no input")
}
p.se.Packet.Channel = uint32(m.chIdMap[p.se.ChannelId])
return p.se.Packet, uint64(p.timestamp.UnixMicro()), nil
}
func (m *MqttIf) WriteMeshPacket(p *pb.MeshPacket) error {
var channelId string
if p.PkiEncrypted {
channelId = "PKI"
p.Priority = pb.MeshPacket_HIGH
} else {
channel := m.Channels.Settings[p.Channel]
channelId = channel.Name
}
if p.RxTime == 0 {
p.RxTime = uint32(time.Now().Unix())
}
p.RelayNode = p.RelayNode & 0xFF
p.NextHop = p.NextHop & 0xFF
p.Channel = 0 // Don't expose your channel number
se := &pb.ServiceEnvelope{
Packet: p,
ChannelId: channelId,
GatewayId: m.GatewayID.String(),
}
payload, err := proto.Marshal(se)
if err != nil {
return err
}
topic := m.channelPublishTopic(channelId)
m.c.Publish(m.ctx, &paho.Publish{
Topic: topic,
Payload: payload,
})
return nil
}
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