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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| package magichome | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "strings" | ||
| "time" | ||
| ) | ||
|
|
||
| // Device represents a Magic Home device that answered the udp broadcast | ||
| type Device struct { | ||
| IP net.IP | ||
| ID string | ||
| Model string | ||
| } | ||
|
|
||
| // DiscoverOptions are used to configure the discovering | ||
| type DiscoverOptions struct { | ||
| BroadcastAddr string | ||
| Timeout uint8 | ||
| } | ||
|
|
||
| // Discover searches for Magic Home devices on the network | ||
| func Discover(options DiscoverOptions) (*[]Device, error) { | ||
| if options.BroadcastAddr == "" { | ||
| options.BroadcastAddr = "255.255.255.255" | ||
| } | ||
|
|
||
| broadcastAddr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:48899", options.BroadcastAddr)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| localAddr, err := net.ResolveUDPAddr("udp4", ":0") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| conn, err := net.ListenUDP("udp4", localAddr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| receivedDevice := make(chan *Device) | ||
| done := make(chan bool, 1) | ||
| var devices []Device | ||
|
|
||
| go receive(conn, receivedDevice) | ||
| go send(conn, broadcastAddr) | ||
| go timeout(options.Timeout, done) | ||
|
|
||
| for { | ||
| select { | ||
| case device, ok := <-receivedDevice: | ||
| if ok { | ||
| devices = append(devices, *device) | ||
| } | ||
| case <-done: | ||
| done = nil | ||
| } | ||
|
|
||
| if done == nil { | ||
| break | ||
| } | ||
| } | ||
|
|
||
| close(receivedDevice) | ||
|
|
||
| return &devices, nil | ||
| } | ||
|
|
||
| func send(conn *net.UDPConn, broadcastAddr *net.UDPAddr) { | ||
| _, err := conn.WriteToUDP([]byte("HF-A11ASSISTHREAD"), broadcastAddr) | ||
| if err != nil { | ||
| fmt.Println("Error: ", err) | ||
| } | ||
| } | ||
|
|
||
| func receive(conn *net.UDPConn, receivedDevice chan<- *Device) { | ||
| for { | ||
| buf := make([]byte, 1024) | ||
| n, _, err := conn.ReadFromUDP(buf) | ||
| if err != nil { | ||
| break | ||
| } | ||
|
|
||
| data := strings.Split(string(buf[:n]), ",") | ||
| if len(data) == 3 { | ||
| receivedDevice <- &Device{ | ||
| IP: net.ParseIP(data[0]), | ||
| ID: data[1], | ||
| Model: data[2], | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func timeout(seconds uint8, done chan<- bool) { | ||
| if seconds < 1 { | ||
| seconds = 1 | ||
| } else if seconds > 30 { | ||
| seconds = 30 | ||
| } | ||
|
|
||
| time.Sleep(time.Duration(seconds) * time.Second) | ||
|
|
||
| done <- true | ||
| } |