fermentord/pkg/tilt/scanner.go

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// MIT License
//
// Copyright (c) 2020 Alex Howarth
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package tilt
import (
"context"
"log"
"time"
"github.com/JuulLabs-OSS/ble"
"github.com/JuulLabs-OSS/ble/examples/lib/dev"
"github.com/pkg/errors"
)
// Scanner for Tilt devices
type Scanner struct {
devices Devices
}
// Devices stores discovered devices
type Devices map[Color]Tilt
// NewScanner returns a Scanner
func NewScanner() *Scanner {
return &Scanner{}
}
// Scan finds Tilt devices and times out after a duration
func (s *Scanner) Scan(ctx context.Context, timeout time.Duration) error {
s.devices = make(map[Color]Tilt)
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d, err := dev.NewDevice("hci0")
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if err != nil {
return err
}
ble.SetDefaultDevice(d)
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defer ble.Stop()
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ctx2 := ble.WithSigHandler(context.WithTimeout(ctx, timeout))
err = ble.Scan(ctx2, false, s.advHandler, advFilter)
if err != nil {
switch errors.Cause(err) {
case nil:
case context.DeadlineExceeded:
// Finished scanning
break
case context.Canceled:
break
default:
return err
}
}
return err
}
func advFilter(a ble.Advertisement) bool {
return IsTilt(a.ManufacturerData())
}
func (s *Scanner) advHandler(a ble.Advertisement) {
// create iBeacon
b, err := NewIBeacon(a.ManufacturerData())
if err != nil {
log.Println(err)
return
}
// create Tilt from iBeacon
t, err := NewTilt(b)
if err != nil {
log.Println(err)
return
}
s.HandleTilt(t)
}
// HandleTilt adds a discovered Tilt to a map
func (s *Scanner) HandleTilt(t Tilt) {
s.devices[t.col] = t
}
// Tilts contains the found devices
func (s *Scanner) Tilts() Devices {
return s.devices
}