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August 1, 2024 02:39
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| package main | |
| import ( | |
| "fmt" | |
| "maps" | |
| "slices" | |
| "sort" | |
| "github.com/godbus/dbus/v5" | |
| ) | |
| const ( | |
| intf = "org.freedesktop.UPower.Device" | |
| path = "/org/freedesktop/UPower/devices/battery_BAT0" | |
| meta = "org.freedesktop.DBus.Properties" | |
| ) | |
| var props = []string{ | |
| "NativePath", // string | |
| "Vendor", // string | |
| "Model", // string | |
| "Serial", // string | |
| "UpdateTime", // uint64 | |
| "Type", // uint32 | |
| "PowerSupply", // bool | |
| "HasHistory", // bool | |
| "HasStatistics", // bool | |
| "Online", // bool | |
| "Energy", // float64 | |
| "EnergyEmpty", // float64 | |
| "EnergyFull", // float64 | |
| "EnergyFullDesign", // float64 | |
| "EnergyRate", // float64 | |
| "Voltage", // float64 | |
| "ChargeCycles", // int32 | |
| "Luminosity", // float64 | |
| "TimeToEmpty", // int64 | |
| "TimeToFull", // int64 | |
| "Percentage", // float64 | |
| "Temperature", // float64 | |
| "IsPresent", // bool | |
| "State", // uint32 | |
| "IsRechargeable", // bool | |
| "Capacity", // float64 | |
| "Technology", // uint32 | |
| "WarningLevel", // uint32 | |
| "BatteryLevel", // uint32 | |
| "IconName", // string | |
| } | |
| func main() { | |
| bus := must(dbus.ConnectSystemBus()) | |
| defer bus.Close() | |
| var bat map[string]dbus.Variant | |
| obj := bus.Object(intf[:22], path) | |
| throw(obj.Call(meta+".GetAll", 0, intf).Store(&bat)) | |
| show(bat) | |
| throw(bus.AddMatchSignal( | |
| dbus.WithMatchInterface(meta), | |
| dbus.WithMatchMember("PropertiesChanged"), | |
| dbus.WithMatchObjectPath(path), | |
| dbus.WithMatchArg(0, intf), | |
| )) | |
| ch := make(chan *dbus.Signal, 10) | |
| bus.Signal(ch) | |
| for sig := range ch { | |
| diff := sig.Body[1].(map[string]dbus.Variant) | |
| maps.Copy(bat, diff) | |
| show(diff) | |
| } | |
| } | |
| func show(dic map[string]dbus.Variant) { | |
| var keys []string | |
| for key, _ := range dic { | |
| if slices.Contains(props, key) { | |
| keys = append(keys, key) | |
| } | |
| } | |
| sort.Strings(keys) | |
| for _, key := range keys { | |
| fmt.Printf("%s = %v\n", key, dic[key].Value()) | |
| } | |
| fmt.Println() | |
| } | |
| func throw(err error) { | |
| if err != nil { | |
| panic(err) | |
| } | |
| } | |
| func must[T any](val T, err error) T { | |
| throw(err) | |
| return val | |
| } |
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