2020-08-27 23:22:27 +03:00
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package bluetooth
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2020-08-28 09:35:13 +03:00
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import (
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"errors"
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2020-08-28 14:31:17 +03:00
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"fmt"
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"time"
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2020-08-28 09:35:13 +03:00
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"github.com/JuulLabs-OSS/cbgo"
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)
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2020-08-28 14:31:17 +03:00
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// Address contains a Bluetooth address, which on macOS instead of a MAC address
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// is instead a UUID.
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2020-08-28 13:40:03 +03:00
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type Address struct {
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// UUID since this is macOS.
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UUID
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}
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2020-08-28 14:31:17 +03:00
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// IsRandom ignored on macOS.
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func (ad Address) IsRandom() bool {
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return false
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}
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2020-08-28 14:31:17 +03:00
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// SetRandom ignored on macOS.
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2020-08-28 13:40:03 +03:00
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func (ad Address) SetRandom(val bool) {
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}
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// Set the address
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func (ad Address) Set(val interface{}) {
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ad.UUID = val.(UUID)
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}
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2020-08-27 23:22:27 +03:00
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// Scan starts a BLE scan. It is stopped by a call to StopScan. A common pattern
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// is to cancel the scan when a particular device has been found.
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func (a *Adapter) Scan(callback func(*Adapter, ScanResult)) (err error) {
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if callback == nil {
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return errors.New("must provide callback to Scan function")
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}
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2020-08-28 14:31:17 +03:00
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if a.scanChan != nil {
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return errors.New("already calling Scan function")
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}
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a.peripheralFoundHandler = callback
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// Channel that will be closed when the scan is stopped.
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// Detecting whether the scan is stopped can be done by doing a non-blocking
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// read from it. If it succeeds, the scan is stopped.
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a.scanChan = make(chan error)
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a.cm.Scan(nil, &cbgo.CentralManagerScanOpts{
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AllowDuplicates: false,
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})
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// Check whether the scan is stopped. This is necessary to avoid a race
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// condition between the signal channel and the cancelScan channel when
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// the callback calls StopScan() (no new callbacks may be called after
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// StopScan is called).
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select {
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case <-a.scanChan:
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close(a.scanChan)
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a.scanChan = nil
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return nil
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}
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}
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// StopScan stops any in-progress scan. It can be called from within a Scan
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// callback to stop the current scan. If no scan is in progress, an error will
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// be returned.
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func (a *Adapter) StopScan() error {
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if a.scanChan == nil {
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return errors.New("not calling Scan function")
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}
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a.scanChan <- nil
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a.cm.StopScan()
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return nil
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}
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// Device is a connection to a remote peripheral.
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type Device struct {
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cbgo.PeripheralDelegateBase
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2020-08-29 12:35:26 +03:00
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cm cbgo.CentralManager
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prph cbgo.Peripheral
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servicesChan chan error
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charsChan chan error
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}
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// Connect starts a connection attempt to the given peripheral device address.
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func (a *Adapter) Connect(address Addresser, params ConnectionParams) (*Device, error) {
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adr := address.(Address)
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uuid, err := cbgo.ParseUUID(adr.UUID.String())
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if err != nil {
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return nil, err
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}
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prphs := a.cm.RetrievePeripheralsWithIdentifiers([]cbgo.UUID{uuid})
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if len(prphs) == 0 {
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return nil, fmt.Errorf("Connect failed: no peer with address: %s", adr.UUID.String())
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}
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a.cm.Connect(prphs[0], nil)
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// wait on channel for connect
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select {
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case p := <-a.connectChan:
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d := &Device{
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cm: a.cm,
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prph: p,
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servicesChan: make(chan error),
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charsChan: make(chan error),
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}
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p.SetDelegate(d)
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return d, nil
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case <-time.NewTimer(10 * time.Second).C:
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return nil, errors.New("timeout on Connect")
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}
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}
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2020-08-29 12:35:26 +03:00
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// Peripheral returns the Device's cbgo.Peripheral
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func (d *Device) Peripheral() (prph cbgo.Peripheral) {
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return d.prph
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}
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// CharsChan returns the Device's charsChan channel used for
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// blocking on discovering the characteristics for a service.
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func (d *Device) CharsChan() chan error {
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return d.charsChan
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}
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// Peripheral delegate functions
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// DidDiscoverServices is called when the services for a Peripheral
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// have been discovered.
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func (d *Device) DidDiscoverServices(prph cbgo.Peripheral, err error) {
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d.servicesChan <- nil
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}
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// DidDiscoverCharacteristics is called when the characteristics for a Service
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// for a Peripheral have been discovered.
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func (d *Device) DidDiscoverCharacteristics(prph cbgo.Peripheral, svc cbgo.Service, err error) {
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d.charsChan <- nil
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}
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