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package api
import (
"fmt"
"github.com/godbus/dbus/v5"
"github.com/muka/go-bluetooth/bluez"
"github.com/muka/go-bluetooth/bluez/profile/advertising"
log "github.com/sirupsen/logrus"
)
// const baseAdvertismentPath = "/org/bluez/%s/apps/advertisement%d"
const BaseAdvertismentPath = "/go_bluetooth/%s/advertisement/%d"
var advertisingCount int = -1
func nextAdvertismentPath(adapterID string) dbus.ObjectPath {
advertisingCount++
return dbus.ObjectPath(fmt.Sprintf(BaseAdvertismentPath, adapterID, advertisingCount))
}
func decreaseAdvertismentCounter() {
advertisingCount--
if advertisingCount < -1 {
advertisingCount = -1
}
}
type Advertisement struct {
path dbus.ObjectPath
objectManager *DBusObjectManager
iprops *DBusProperties
conn *dbus.Conn
props *advertising.LEAdvertisement1Properties
}
func (a *Advertisement) DBusConn() *dbus.Conn {
return a.conn
}
func (a *Advertisement) DBusObjectManager() *DBusObjectManager {
return a.objectManager
}
func (a *Advertisement) DBusProperties() *DBusProperties {
return a.iprops
}
func (a *Advertisement) GetProperties() bluez.Properties {
return a.props
}
func (a *Advertisement) Path() dbus.ObjectPath {
return a.path
}
func (a *Advertisement) Interface() string {
return advertising.LEAdvertisement1Interface
}
func NewAdvertisement(adapterID string, props *advertising.LEAdvertisement1Properties) (*Advertisement, error) {
adv := new(Advertisement)
adv.props = props
adv.path = nextAdvertismentPath(adapterID)
conn, err := dbus.SystemBus()
if err != nil {
return nil, err
}
adv.conn = conn
om, err := NewDBusObjectManager(conn)
if err != nil {
return nil, err
}
adv.objectManager = om
iprops, err := NewDBusProperties(conn)
if err != nil {
return nil, err
}
adv.iprops = iprops
return adv, nil
}
// Expose to bluez an advertisment instance via the adapter advertisement manager
func ExposeAdvertisement(adapterID string, props *advertising.LEAdvertisement1Properties, discoverableTimeout uint32) (func(), error) {
log.Tracef("Retrieving adapter instance %s", adapterID)
a, err := GetAdapter(adapterID)
if err != nil {
return nil, err
}
adv, err := NewAdvertisement(adapterID, props)
if err != nil {
return nil, err
}
err = ExposeDBusService(adv)
if err != nil {
return nil, err
}
log.Debug("Setup adapter")
err = a.SetDiscoverable(true)
if err != nil {
return nil, err
}
err = a.SetDiscoverableTimeout(discoverableTimeout)
if err != nil {
return nil, err
}
err = a.SetPowered(true)
if err != nil {
return nil, err
}
log.Trace("Registering LEAdvertisement1 instance")
advManager, err := advertising.NewLEAdvertisingManager1FromAdapterID(adapterID)
if err != nil {
return nil, err
}
err = advManager.RegisterAdvertisement(adv.Path(), map[string]interface{}{})
if err != nil {
return nil, err
}
cancel := func() {
decreaseAdvertismentCounter()
err := advManager.UnregisterAdvertisement(adv.Path())
if err != nil {
log.Warn(err)
}
err = a.SetProperty("Discoverable", false)
if err != nil {
log.Warn(err)
}
}
return cancel, nil
}
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