balazsgrill/wscgo

// +build linux

package cometblue

import (
    "log"
    "sync"

    "github.com/go-ble/ble"
    "github.com/go-ble/ble/examples/lib/dev"
)

// CometBlueContext holds static information to control CB devices
type CometBlueContext struct {
    once sync.Once

    ThermostatService ble.UUID
    TemperaturesChar  ble.UUID
    BatteryChar       ble.UUID
    PinChar           ble.UUID
}

var cbContextInstance CometBlueContext

func (c *CometBlueContext) init() error {
    var err error
    c.once.Do(func() {
        log.Println("Initializing bluetooth")
        d, err := dev.NewDevice("default")
        if err != nil {
            return
        }
        ble.SetDefaultDevice(d)

        c.ThermostatService, err = ble.Parse("47e9ee00-47e9-11e4-8939-164230d1df67")
        if err != nil {
            return
        }
        c.TemperaturesChar, err = ble.Parse("47e9ee2b-47e9-11e4-8939-164230d1df67")
        if err != nil {
            return
        }
        c.BatteryChar, err = ble.Parse("47e9ee2c-47e9-11e4-8939-164230d1df67")
        if err != nil {
            return
        }
        c.PinChar, err = ble.Parse("47e9ee30-47e9-11e4-8939-164230d1df67")
        if err != nil {
            return
        }
    })
    return err
}

// GetCBContext retrieve singleton CometBlueContext instance and makes sure that Bluetooth is initialized
func GetCBContext() *CometBlueContext {
    err := cbContextInstance.init()
    if err != nil {
        log.Fatalf("Failed to Initialize Bluetooth: %s", err)
    }
    return &cbContextInstance
}