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pitooth.go
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pitooth.go
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package pitooth
import (
"fmt"
"os"
"runtime"
"strings"
"time"
"github.com/muka/go-bluetooth/bluez/profile/adapter"
"github.com/muka/go-bluetooth/bluez/profile/agent"
"github.com/sirupsen/logrus"
)
/*
PiTooth is a simple Bluetooth manager for Raspberry Pi devices.
- Accept incoming connections
- Get a list of nearby/connected devices
- Control the OBEX server
- Receive files from connected devices
*/
func init() {
// Suppress excess warning logs from the bluetooth library
logrus.SetLevel(logrus.ErrorLevel)
}
type BluetoothManager interface {
AcceptConnections(time.Duration) (map[string]Device, error)
GetNearbyDevices() (map[string]Device, error)
GetConnectedDevices() (map[string]Device, error)
// UnpairDevice(string) error
// ControlBluetoothPower(bool) error
// OBEX is a protocol for transferring files between devices over Bluetooth
ControlOBEXServer(bool, string) error
Close(bool)
}
type bluetoothManager struct {
adapter *adapter.Adapter1
agent *PiToothAgent
l *logrus.Logger
}
type Device struct {
LastSeen time.Time
Address string
Name string
Connected bool
}
func NewBluetoothManager(deviceAlias string, opts ...BluetoothManagerOption) (BluetoothManager, error) {
// We should always set a device alias, or it gets tricky.
if deviceAlias == "" {
return nil, fmt.Errorf("Bluetooth device alias cannot be empty")
}
// Only support Linux, this should be running on a Raspberry Pi
if runtime.GOOS != "linux" {
return nil, fmt.Errorf("Unsupported OS: %v", runtime.GOOS)
} else {
_, err := os.Stat("/proc/device-tree/model")
if err != nil {
return nil, fmt.Errorf("Not a Raspberry Pi, can't enable Bluetooth Discovery: %v", err)
}
}
// Get the bt adapter to manage bluetooth devices
defaultAdapter, err := adapter.GetDefaultAdapter()
if err != nil {
return nil, fmt.Errorf("Failed to get default adapter: %v", err)
}
// Connect pitooth agent to handle pairing requests
pitoothAgent := &PiToothAgent{
SimpleAgent: agent.NewSimpleAgent(),
l: defaultLogger(),
}
btm := bluetoothManager{
adapter: defaultAdapter,
agent: pitoothAgent,
l: defaultLogger(),
}
// Apply any options
for _, opt := range opts {
err := opt(&btm)
if err != nil {
return nil, err
}
}
// Set the device alias
err = btm.adapter.SetAlias(deviceAlias)
if err != nil {
return nil, fmt.Errorf("Failed to set bluetooth alias: %v", err)
}
err = btm.adapter.SetPowered(true)
if err != nil {
return nil, fmt.Errorf("Failed to power on bluetooth adapter: %v", err)
}
// Apply the registration agent to the adapter
err = agent.ExposeAgent(btm.adapter.Client().GetConnection(), btm.agent, agent.CapNoInputNoOutput, true)
if err != nil {
return nil, fmt.Errorf("Failed to register agent: %v", err)
}
return &btm, nil
}
type BluetoothManagerOption func(*bluetoothManager) error
// WithLogger configures a custom logger for the Bluetooth manager
func WithLogger(l *logrus.Logger) BluetoothManagerOption {
return func(bm *bluetoothManager) error {
bm.l = l
bm.agent.l = l
return nil
}
}
// WithAdapter configures a custom Bluetooth adapter that implements the Adapter1 interface
func WithAdapter(a adapter.Adapter1) BluetoothManagerOption {
return func(bm *bluetoothManager) error {
bm.adapter = &a
return nil
}
}
// Opens the bluetooth adapter to accept connections for a period of time
func (btm *bluetoothManager) AcceptConnections(pairingWindow time.Duration) (map[string]Device, error) {
btm.l.Debugln("PiTooth: Starting Pairing...")
if pairingWindow == 0 {
btm.l.Debugln("PiTooth: No pairing window specified, defaulting to 30 seconds")
pairingWindow = 30 * time.Second
}
// Make the device discoverable
btm.l.Debugln("PiTooth: Setting Discoverable...")
err := btm.adapter.SetDiscoverable(true)
if err != nil {
return nil, fmt.Errorf("Failed to make device discoverable: %v", err)
}
btm.l.Debugln("PiTooth: Setting Pairable...")
err = btm.adapter.SetPairable(true)
if err != nil {
return nil, fmt.Errorf("Failed to make device pairable: %v", err)
}
// Start the discovery
btm.l.Debugln("PiTooth: Starting Discovery...")
err = btm.adapter.StartDiscovery()
if err != nil {
return nil, fmt.Errorf("Failed to start bluetooth discovery: %v", err)
}
// Wait for the device to be discovered
btm.l.Infoln("PiTooth: Accepting Connections...")
// Hang out here until the window expires
connectedDevices := make(map[string]Device)
start := time.Now()
for time.Since(start) < pairingWindow {
connectedDevices, err = btm.GetConnectedDevices()
}
if err != nil {
return nil, fmt.Errorf("Failed to get nearby devices: %v", err)
}
// Make the device undiscoverable
btm.l.Debugln("PiTooth: Setting Undiscoverable...")
err = btm.adapter.SetDiscoverable(false)
if err != nil {
return nil, fmt.Errorf("Failed to make device undiscoverable: %v", err)
}
// Stop the discovery
btm.l.Debugln("PiTooth: Stopping Discovery...")
err = btm.adapter.StopDiscovery()
if err != nil {
return nil, fmt.Errorf("Failed to stop bluetooth discovery: %v", err)
}
btm.l.Debugln("PiTooth: Connected devices: ", connectedDevices)
return connectedDevices, nil
}
// Get a map of all the nearby devices
func (btm *bluetoothManager) GetNearbyDevices() (map[string]Device, error) {
btm.l.Debugln("PiTooth: Starting GetNearbyDevices...")
nearbyDevices, err := btm.collectNearbyDevices()
if err != nil {
return nil, err
}
btm.l.Debugln("PiTooth: # of nearby devices: ", len(nearbyDevices))
for _, device := range nearbyDevices {
btm.l.Debugln("PiTooth: Nearby device: ", device.Name, " : ", device.Address, " : ", device.LastSeen, " : ", device.Connected)
}
return nearbyDevices, nil
}
// Check all nearby devices and return the connected ones
func (btm *bluetoothManager) GetConnectedDevices() (map[string]Device, error) {
btm.l.Debugln("PiTooth: Starting GetConnectedDevices...")
nearbyDevices, err := btm.collectNearbyDevices()
if err != nil {
return nil, err
}
connectedDevices := make(map[string]Device)
for _, device := range nearbyDevices {
if device.Connected {
connectedDevices[device.Address] = device
}
}
btm.l.Debugln("PiTooth: # of connected devices: ", len(connectedDevices))
return connectedDevices, nil
}
// Get the devices every second, for 5 seconds.
// Return a map of all the devices found.
func (btm *bluetoothManager) collectNearbyDevices() (map[string]Device, error) {
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
done := time.After(5 * time.Second)
nearbyDevices := make(map[string]Device)
for {
select {
case <-done:
return nearbyDevices, nil
case <-ticker.C:
devices, err := btm.adapter.GetDevices()
if err != nil {
return nil, fmt.Errorf("Failed to get bluetooth devices: %v", err)
}
for _, device := range devices {
btm.l.Debugln("PiTooth: Discovered bluetooth device: ", device.Properties.Alias, " : ", device.Properties.Address)
nearbyDevices[device.Properties.Address] = Device{
LastSeen: time.Now(),
Address: device.Properties.Address,
Name: device.Properties.Alias,
Connected: device.Properties.Connected,
}
}
}
}
}
// Close the active bluetooth adapter & agent
// Optionally turn off the bluetooth device
func (btm *bluetoothManager) Close(turnOff bool) {
btm.adapter.StopDiscovery()
btm.adapter.SetDiscoverable(false)
btm.adapter.SetPairable(false)
btm.agent.Cancel()
if turnOff {
btm.adapter.SetPowered(false)
}
}
func defaultLogger() *logrus.Logger {
l := logrus.New()
// Setup the logger, so it can be parsed by datadog
l.Formatter = &logrus.JSONFormatter{}
l.SetOutput(os.Stdout)
// Set the log level
logLevel := strings.ToLower(os.Getenv("LOG_LEVEL"))
switch logLevel {
case "debug":
l.SetLevel(logrus.DebugLevel)
case "info":
l.SetLevel(logrus.InfoLevel)
case "error":
l.SetLevel(logrus.ErrorLevel)
default:
l.SetLevel(logrus.InfoLevel)
}
return l
}