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|
package main
import (
"encoding/json"
"fmt"
"log"
"strconv"
"strings"
)
type Direction int
const (
DirectionInput Direction = iota
DirectionOutput
)
type Device interface {
Identity() string
Connect(*MQTTBroker, chan<- Event, chan<- Metric, chan<- interface{}) (<-chan Command, error)
OutputOn(int) error
OutputOff(int) error
Disconnect() error
}
type Command struct {
Index int
Active bool
}
type Event struct {
Device Device
Index int
Active bool
Direction Direction
}
type Metric struct {
Device Device
Name string
Value interface{}
}
type DeviceAnnounce struct {
ID string `json:"id"`
IP string `json:"ip"`
MacAddress string `json:"mac"`
Model string `json:"model"`
FirmwareVersion string `json:"fw_ver"`
NewFirmwareAvailable bool `json:"new_fw"`
}
func NewDevice(b *MQTTBroker, da DeviceAnnounce) (Device, error) {
switch da.Model {
case "SHSW-PM":
return NewShellyDevice(da, 1, 1), nil
case "SHSW-25":
return NewShellyDevice(da, 2, 2), nil
}
return nil, fmt.Errorf("Unknown device model %s", da.Model)
}
type ShellyDevice struct {
ID string
Manufacturer string
IP string // TODO: Fix type
MacAddress string // TODO: Fix type
Model string // TODO: Fix type
FirmwareVersion string // TODO: Fix type
NewFirmwareAvailable bool
broker *MQTTBroker
inputCount int
outputCount int
connected bool
inputState []bool
outputState []bool
subscribed []string
events chan<- Event
metrics chan<- Metric
info chan<- interface{}
commands chan Command
}
func NewShellyDevice(da DeviceAnnounce, inputCount, outputCount int) *ShellyDevice {
return &ShellyDevice{
Manufacturer: "Shelly",
ID: da.ID,
IP: da.IP,
MacAddress: da.MacAddress,
Model: da.Model,
FirmwareVersion: da.FirmwareVersion,
NewFirmwareAvailable: da.NewFirmwareAvailable,
inputCount: inputCount,
outputCount: outputCount,
inputState: make([]bool, inputCount),
outputState: make([]bool, outputCount),
connected: false,
subscribed: []string{},
commands: make(chan Command, 100),
}
}
var _ Device = (*ShellyDevice)(nil)
func (d *ShellyDevice) Identity() string {
return d.ID
}
func (d *ShellyDevice) handleOutputMessages(topic string, payload []byte) {
path := strings.Split(topic, "/")[2:]
switch path[0] {
case "info":
p := ShellyStatus{Device: d}
if err := json.Unmarshal(payload, &p); err != nil {
log.Printf("Error parsing info packet: %s", err)
return
}
d.info <- p
case "input":
idx, err := strconv.Atoi(path[1])
if err != nil {
log.Println("Error parsing index")
return
}
state := payload[0] == '0'
if d.inputState[idx] != state {
d.events <- Event{
Device: d,
Index: idx,
Active: state,
Direction: DirectionInput,
}
d.inputState[idx] = state
}
case "relay":
idx, err := strconv.Atoi(path[1])
if err != nil {
log.Println("Error parsing index")
return
}
if len(path) == 2 {
state := string(payload) == "on"
if d.outputState[idx] != state {
d.events <- Event{
Device: d,
Index: idx,
Active: state,
Direction: DirectionOutput,
}
d.outputState[idx] = state
}
} else {
switch path[2] {
case "power":
m, err := strconv.ParseFloat(string(payload), 16)
if err != nil {
log.Printf("Failed to parse metric")
return
}
d.metrics <- Metric{
Device: d,
Name: fmt.Sprintf("relay_%d_power", idx),
Value: m,
}
case "energy":
m, err := strconv.ParseInt(string(payload), 10, 32)
if err != nil {
log.Printf("Failed to parse metric")
return
}
d.metrics <- Metric{
Device: d,
Name: fmt.Sprintf("relay_%d_energy", idx),
Value: m,
}
case "overpower_value":
m, err := strconv.ParseInt(string(payload), 10, 32)
if err != nil {
log.Printf("Failed to parse metric")
return
}
d.metrics <- Metric{
Device: d,
Name: fmt.Sprintf("relay_%d_overpower_value", idx),
Value: m,
}
}
}
case "temperature":
m, err := strconv.ParseFloat(string(payload), 16)
if err != nil {
log.Printf("Failed to parse metric")
return
}
d.metrics <- Metric{
Device: d,
Name: "temperature_c",
Value: m,
}
case "overtemperature":
d.metrics <- Metric{
Device: d,
Name: "is_overtemperature",
Value: payload[0] == '1',
}
}
}
func (d *ShellyDevice) OutputOn(idx int) error {
if idx < 0 || idx >= d.outputCount {
return fmt.Errorf("Index is out of range for device")
}
if d.broker == nil {
return fmt.Errorf("Device is not connected to broker")
}
return d.broker.Publish(fmt.Sprintf("shellies/%s/relay/%d/command", d.Identity(), idx), "on")
}
func (d *ShellyDevice) OutputOff(idx int) error {
if idx < 0 || idx >= d.outputCount {
return fmt.Errorf("Index is out of range for device")
}
if d.broker == nil {
return fmt.Errorf("Device is not connected to broker")
}
return d.broker.Publish(fmt.Sprintf("shellies/%s/relay/%d/command", d.Identity(), idx), "off")
}
func (d *ShellyDevice) Connect(b *MQTTBroker, events chan<- Event, metrics chan<- Metric, info chan<- interface{}) (<-chan Command, error) {
d.broker = b
d.events = events
d.metrics = metrics
d.info = info
outputs := []string{
"shellies/{ID}/info",
"shellies/{ID}/temperature",
"shellies/{ID}/overtemperature",
}
for i := d.inputCount - 1; i >= 0; i-- {
outputs = append(outputs, fmt.Sprintf("shellies/{ID}/input/%d", i))
outputs = append(outputs, fmt.Sprintf("shellies/{ID}/longpush/%d", i))
}
for i := d.outputCount - 1; i >= 0; i-- {
outputs = append(outputs, fmt.Sprintf("shellies/{ID}/relay/%d", i))
outputs = append(outputs, fmt.Sprintf("shellies/{ID}/relay/%d/power", i))
outputs = append(outputs, fmt.Sprintf("shellies/{ID}/relay/%d/energy", i))
outputs = append(outputs, fmt.Sprintf("shellies/{ID}/relay/%d/overpower_value", i))
}
// TODO: Handle these
inputs := []string{
"",
}
_ = inputs
for _, topic := range outputs {
tn := strings.Replace(topic, "{ID}", d.ID, 1)
if err := b.Subscribe(tn, d.handleOutputMessages); err != nil {
return nil, err
}
d.subscribed = append(d.subscribed, tn)
}
d.connected = true
return d.commands, nil
}
func (d *ShellyDevice) Disconnect() error {
if !d.connected {
return fmt.Errorf("Device not connected, can not disconnect")
}
return nil
}
|
