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