OpenHue Go

Overview

OpenHue Go is a library written in Goland for interacting with the Philips Hue smart lighting systems. This project is based on the OpenHue API specification. Therefore, most of its code is automatically generated thanks to the oapi-codegen project.

Usage

Use the following command to import the library:

go get -u github.com/openhue/openhue-go

And check the following example that toggles all the rooms of your house:

package main

import (
	"fmt"
	"github.com/openhue/openhue-go"
	"log"
)

func main() {

	home, _ := openhue.NewHome(openhue.LoadConf())
	rooms, _ := home.GetRooms()

	for id, room := range rooms {

		fmt.Printf("> Toggling room %s (%s)\n", *room.Metadata.Name, id)

		for serviceId, serviceType := range room.GetServices() {

			if serviceType == openhue.ResourceIdentifierRtypeGroupedLight {
				groupedLight, _ := home.GetGroupedLightById(serviceId)

				home.UpdateGroupedLight(*groupedLight.Id, openhue.GroupedLightPut{
					On: groupedLight.Toggle(),
				})
			}
		}
	}
}

[!NOTE]
The openhue.LoadConf() function allows loading the configuration from the well-known configuration file. Please refer to this guide for more information.

Bridge Discovery

Bridge Discovery on the local network has been made easy through the BridgeDiscovery helper:

package main

import (
	"fmt"
	"github.com/openhue/openhue-go"
	"log"
	"time"
)

func main() {

	bridge, err := openhue.NewBridgeDiscovery(openhue.WithTimeout(1 * time.Second)).Discover()
	openhue.CheckErr(err)

	fmt.Println(bridge) // Output: Bridge{instance: "Hue Bridge - 1A3E4F", host: "ecb5fa1a3e4f.local.", ip: "192.168.1.xx"}
}

The BridgeDiscovery.Discover() function will first try to discover your local bridge via mDNS, and if that fails then it tries using discovery.meethue.com URL.

Options:

• openhue.WithTimeout allows setting the mDNS discovery timeout. Default value is 5 seconds.
• openhue.WithDisabledUrlDiscovery allows disabling the URL discovery.

Authentication

Bridge authentication has been make simple via the Authenticator interface:

package main

import (
	"fmt"
	"github.com/openhue/openhue-go"
	"time"
)

func main() {

	bridge, err := openhue.NewBridgeDiscovery(openhue.WithTimeout(1 * time.Second)).Discover()
	openhue.CheckErr(err)

	authenticator, err := openhue.NewAuthenticator(bridge.IpAddress)
	openhue.CheckErr(err)

	fmt.Println("Press the link button")

	var key string
	for len(key) == 0 {

		// try to authenticate
		apiKey, retry, err := authenticator.Authenticate()

		if err != nil && retry {
			// link button not pressed
			fmt.Printf(".")
			time.Sleep(500 * time.Millisecond)
		} else if err != nil && !retry {
			// there is a real error
			openhue.CheckErr(err)
		} else {
			key = apiKey
		}
	}

	fmt.Println("\n", key)
}

In this example, we wait until the link button is pressed on the bridge. The Authenticator.Authenticate() function returns three values:

• apiKey string that is not empty when retry = false and err == nil
• retry bool which indicates that the link button has not been pressed
• err error which contains the error details

You can consider the authentication has failed whenever the retry value is false and the err is not nil.

License

OpenHue is distributed under the Apache License 2.0, making it open and free for anyone to use and contribute to. See the license file for detailed terms.