itd is a daemon that uses my infinitime library to interact with the PineTime snartwatch running InfiniTime.
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/*
* itd uses bluetooth low energy to communicate with InfiniTime devices
* Copyright (C) 2021 Arsen Musayelyan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"bufio"
"encoding/json"
"fmt"
"net"
"os"
"path/filepath"
"time"
"github.com/mitchellh/mapstructure"
"github.com/rs/zerolog/log"
"go.arsenm.dev/infinitime"
"go.arsenm.dev/itd/internal/types"
)
const SockPath = "/tmp/itd/socket"
const (
ReqTypeHeartRate = "hrt"
ReqTypeBattLevel = "battlvl"
ReqTypeFwVersion = "fwver"
ReqTypeFwUpgrade = "fwupg"
ReqTypeBtAddress = "btaddr"
ReqTypeNotify = "notify"
ReqTypeSetTime = "settime"
)
const (
UpgradeTypeArchive = iota
UpgradeTypeFiles
)
func startSocket(dev *infinitime.Device) error {
// Make socket directory if non existant
err := os.MkdirAll(filepath.Dir(SockPath), 0755)
if err != nil {
return err
}
// Remove old socket if it exists
err = os.RemoveAll(SockPath)
if err != nil {
return err
}
// Listen on socket path
ln, err := net.Listen("unix", SockPath)
if err != nil {
return err
}
go func() {
for {
// Accept socket connection
conn, err := ln.Accept()
if err != nil {
log.Error().Err(err).Msg("Error accepting connection")
}
// Concurrently handle connection
go handleConnection(conn, dev)
}
}()
// Log socket start
log.Info().Str("path", SockPath).Msg("Started control socket")
return nil
}
func handleConnection(conn net.Conn, dev *infinitime.Device) {
defer conn.Close()
// If firmware is updating, return error
if firmwareUpdating {
connErr(conn, nil, "Firmware update in progress")
return
}
// Create new scanner on connection
scanner := bufio.NewScanner(conn)
for scanner.Scan() {
var req types.Request
// Decode scanned message into types.Request
err := json.Unmarshal(scanner.Bytes(), &req)
if err != nil {
connErr(conn, err, "Error decoding JSON input")
continue
}
switch req.Type {
case ReqTypeHeartRate:
// Get heart rate from watch
heartRate, err := dev.HeartRate()
if err != nil {
connErr(conn, err, "Error getting heart rate")
break
}
// Encode heart rate to connection
json.NewEncoder(conn).Encode(types.Response{
Value: heartRate,
})
case ReqTypeBattLevel:
// Get battery level from watch
battLevel, err := dev.BatteryLevel()
if err != nil {
connErr(conn, err, "Error getting battery level")
break
}
// Encode battery level to connection
json.NewEncoder(conn).Encode(types.Response{
Value: battLevel,
})
case ReqTypeFwVersion:
// Get firmware version from watch
version, err := dev.Version()
if err != nil {
connErr(conn, err, "Error getting battery level")
break
}
// Encode version to connection
json.NewEncoder(conn).Encode(types.Response{
Value: version,
})
case ReqTypeBtAddress:
// Encode bluetooth address to connection
json.NewEncoder(conn).Encode(types.Response{
Value: dev.Address(),
})
case ReqTypeNotify:
// If no data, return error
if req.Data == nil {
connErr(conn, nil, "Data required for notify types.Request")
break
}
var reqData types.ReqDataNotify
// Decode data map to notify types.Request data
err = mapstructure.Decode(req.Data, &reqData)
if err != nil {
connErr(conn, err, "Error decoding types.Request data")
break
}
// Send notification to watch
err = dev.Notify(reqData.Title, reqData.Body)
if err != nil {
connErr(conn, err, "Error sending notification")
break
}
// Encode empty types.Response to connection
json.NewEncoder(conn).Encode(types.Response{})
case ReqTypeSetTime:
// If no data, return error
if req.Data == nil {
connErr(conn, nil, "Data required for settime types.Request")
break
}
// Get string from data or return error
reqTimeStr, ok := req.Data.(string)
if !ok {
connErr(conn, nil, "Data for settime types.Request must be RFC3339 formatted time string")
break
}
var reqTime time.Time
if reqTimeStr == "now" {
reqTime = time.Now()
} else {
// Parse time as RFC3339/ISO9601
reqTime, err = time.Parse(time.RFC3339, reqTimeStr)
if err != nil {
connErr(conn, err, "Invalid time format. Time string must be formatted as ISO8601 or the word `now`")
break
}
}
// Set time on watch
err = dev.SetTime(reqTime)
if err != nil {
connErr(conn, err, "Error setting device time")
break
}
// Encode empty types.Response to connection
json.NewEncoder(conn).Encode(types.Response{})
case ReqTypeFwUpgrade:
// If no data, return error
if req.Data == nil {
connErr(conn, nil, "Data required for firmware upgrade types.Request")
break
}
var reqData types.ReqDataFwUpgrade
// Decode data map to firmware upgrade types.Request data
err = mapstructure.Decode(req.Data, &reqData)
if err != nil {
connErr(conn, err, "Error decoding types.Request data")
break
}
switch reqData.Type {
case UpgradeTypeArchive:
// If less than one file, return error
if len(reqData.Files) < 1 {
connErr(conn, nil, "Archive upgrade requires one file with .zip extension")
break
}
// If file is not zip archive, return error
if filepath.Ext(reqData.Files[0]) != ".zip" {
connErr(conn, nil, "Archive upgrade file must be a zip archive")
break
}
// Load DFU archive
err := dev.DFU.LoadArchive(reqData.Files[0])
if err != nil {
connErr(conn, err, "Error loading archive file")
break
}
case UpgradeTypeFiles:
// If less than two files, return error
if len(reqData.Files) < 2 {
connErr(conn, nil, "Files upgrade requires two files. First with .dat and second with .bin extension.")
break
}
// If first file is not init packet, return error
if filepath.Ext(reqData.Files[0]) != ".dat" {
connErr(conn, nil, "First file must be a .dat file")
break
}
// If second file is not firmware image, return error
if filepath.Ext(reqData.Files[1]) != ".bin" {
connErr(conn, nil, "Second file must be a .bin file")
break
}
// Load individual DFU files
err := dev.DFU.LoadFiles(reqData.Files[0], reqData.Files[1])
if err != nil {
connErr(conn, err, "Error loading firmware files")
break
}
}
go func() {
// Get progress
progress := dev.DFU.Progress()
// For every progress event
for event := range progress {
// Encode event on connection
json.NewEncoder(conn).Encode(types.Response{
Value: event,
})
}
}()
// Set firmwareUpdating
firmwareUpdating = true
// Start DFU
err = dev.DFU.Start()
if err != nil {
connErr(conn, err, "Error performing upgrade")
break
}
firmwareUpdating = false
}
}
}
func connErr(conn net.Conn, err error, msg string) {
var res types.Response
// If error exists, add to types.Response, otherwise don't
if err != nil {
log.Error().Err(err).Msg(msg)
res = types.Response{Message: fmt.Sprintf("%s: %s", msg, err)}
} else {
log.Error().Msg(msg)
res = types.Response{Message: msg}
}
res.Error = true
// Encode error to connection
json.NewEncoder(conn).Encode(res)
}