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adapter_darwin.go
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adapter_darwin.go
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package bluetooth
import (
"errors"
"sync"
"time"
"github.com/tinygo-org/cbgo"
)
// Adapter is a connection to BLE devices.
type Adapter struct {
cmd *centralManagerDelegate
pmd *peripheralManagerDelegate
cm cbgo.CentralManager
pm cbgo.PeripheralManager
peripheralFoundHandler func(*Adapter, ScanResult)
scanChan chan error
poweredChan chan error
// connectMap is a mapping of peripheralId -> chan cbgo.Peripheral,
// used to allow multiple callers to call Connect concurrently.
connectMap sync.Map
connectHandler func(device Device, connected bool)
}
// DefaultAdapter is the default adapter on the system.
//
// Make sure to call Enable() before using it to initialize the adapter.
var DefaultAdapter = &Adapter{
cm: cbgo.NewCentralManager(nil),
pm: cbgo.NewPeripheralManager(nil),
connectMap: sync.Map{},
connectHandler: func(device Device, connected bool) {
return
},
}
// Enable configures the BLE stack. It must be called before any
// Bluetooth-related calls (unless otherwise indicated).
func (a *Adapter) Enable() error {
if a.poweredChan != nil {
return errors.New("already calling Enable function")
}
// wait until powered
a.poweredChan = make(chan error, 1)
a.cmd = ¢ralManagerDelegate{a: a}
a.cm.SetDelegate(a.cmd)
if a.cm.State() != cbgo.ManagerStatePoweredOn {
select {
case <-a.poweredChan:
case <-time.NewTimer(10 * time.Second).C:
return errors.New("timeout enabling CentralManager")
}
}
// drain any extra powered-on events from channel
for len(a.poweredChan) > 0 {
<-a.poweredChan
}
// wait until powered?
a.pmd = &peripheralManagerDelegate{a: a}
a.pm.SetDelegate(a.pmd)
return nil
}
// CentralManager delegate functions
type centralManagerDelegate struct {
cbgo.CentralManagerDelegateBase
a *Adapter
}
// CentralManagerDidUpdateState when central manager state updated.
func (cmd *centralManagerDelegate) CentralManagerDidUpdateState(cmgr cbgo.CentralManager) {
// powered on?
if cmgr.State() == cbgo.ManagerStatePoweredOn {
cmd.a.poweredChan <- nil
}
// TODO: handle other state changes.
}
// DidDiscoverPeripheral when peripheral is discovered.
func (cmd *centralManagerDelegate) DidDiscoverPeripheral(cmgr cbgo.CentralManager, prph cbgo.Peripheral,
advFields cbgo.AdvFields, rssi int) {
if cmd.a.peripheralFoundHandler != nil {
sr := makeScanResult(prph, advFields, rssi)
cmd.a.peripheralFoundHandler(cmd.a, sr)
}
}
// DidDisconnectPeripheral when peripheral is disconnected.
func (cmd *centralManagerDelegate) DidDisconnectPeripheral(cmgr cbgo.CentralManager, prph cbgo.Peripheral, err error) {
id := prph.Identifier().String()
addr := Address{}
uuid, _ := ParseUUID(id)
addr.UUID = uuid
cmd.a.connectHandler(Device{Address: addr}, false)
// like with DidConnectPeripheral, check if we have a chan allocated for this and send through the peripheral
// this will only be true if the receiving side is still waiting for a connection to complete
if ch, ok := cmd.a.connectMap.LoadAndDelete(id); ok {
ch.(chan cbgo.Peripheral) <- prph
}
}
// DidConnectPeripheral when peripheral is connected.
func (cmd *centralManagerDelegate) DidConnectPeripheral(cmgr cbgo.CentralManager, prph cbgo.Peripheral) {
id := prph.Identifier().String()
// Check if we have a chan allocated for this peripheral, and remove it
// from the map if so (it's single-use, will be garbage collected after
// receiver receives the peripheral).
//
// If we don't have a chan allocated, the receiving side timed out, so
// ignore this connection.
if ch, ok := cmd.a.connectMap.LoadAndDelete(id); ok {
// Unblock now that we're connected.
ch.(chan cbgo.Peripheral) <- prph
}
}
// makeScanResult creates a ScanResult when peripheral is found.
func makeScanResult(prph cbgo.Peripheral, advFields cbgo.AdvFields, rssi int) ScanResult {
uuid, _ := ParseUUID(prph.Identifier().String())
var serviceUUIDs []UUID
for _, u := range advFields.ServiceUUIDs {
parsedUUID, _ := ParseUUID(u.String())
serviceUUIDs = append(serviceUUIDs, parsedUUID)
}
var manufacturerData []ManufacturerDataElement
if len(advFields.ManufacturerData) > 2 {
// Note: CoreBluetooth seems to assume there can be only one
// manufacturer data fields in an advertisement packet, while the
// specification allows multiple such fields. See the Bluetooth Core
// Specification Supplement, table 1.1:
// https://www.bluetooth.com/specifications/css-11/
manufacturerID := uint16(advFields.ManufacturerData[0])
manufacturerID += uint16(advFields.ManufacturerData[1]) << 8
manufacturerData = append(manufacturerData, ManufacturerDataElement{
CompanyID: manufacturerID,
Data: advFields.ManufacturerData[2:],
})
}
var serviceData []ServiceDataElement
for _, svcData := range advFields.ServiceData {
cbgoUUID := svcData.UUID
uuid, err := ParseUUID(cbgoUUID.String())
if err != nil {
continue
}
serviceData = append(serviceData, ServiceDataElement{
UUID: uuid,
Data: svcData.Data,
})
}
// Peripheral UUID is randomized on macOS, which means to
// different centrals it will appear to have a different UUID.
return ScanResult{
RSSI: int16(rssi),
Address: Address{
UUID: uuid,
},
AdvertisementPayload: &advertisementFields{
AdvertisementFields{
LocalName: advFields.LocalName,
ServiceUUIDs: serviceUUIDs,
ManufacturerData: manufacturerData,
ServiceData: serviceData,
},
},
}
}
// PeripheralManager delegate functions
type peripheralManagerDelegate struct {
cbgo.PeripheralManagerDelegateBase
a *Adapter
}