homebridge-raspberry-pi-sensehat/dist/sensehatLightAccessory.js

A Homebridge plugin for Raspberry Pi SenseHAT

import { debounce } from './utils.js';
import { exec } from 'child_process';
/**
 * Platform Accessory "Sensehat Light"
 */
export class SensehatLightAccessory {
    platform;
    accessory;
    lightService;
    lightState = {
        On: false,
        Brightness: 100,
        Hue: 0,
        Saturation: 100,
    };
    prevLightState = { ...this.lightState };
    constructor(platform, accessory) {
        this.platform = platform;
        this.accessory = accessory;
        // set accessory information
        this.accessory.getService(this.platform.Service.AccessoryInformation)
            .setCharacteristic(this.platform.Characteristic.Manufacturer, 'Raspberry')
            .setCharacteristic(this.platform.Characteristic.Model, 'SenseHat')
            .setCharacteristic(this.platform.Characteristic.FirmwareRevision, '1.0')
            .setCharacteristic(this.platform.Characteristic.SerialNumber, '1.0');
        // create a lightbulb service
        this.lightService = this.accessory.getService(this.platform.Service.Lightbulb) ||
            this.accessory.addService(this.platform.Service.Lightbulb, accessory.context.device.displayName, 'sensehat-switch');
        // register handlers for Characteristics
        this.lightService.getCharacteristic(this.platform.Characteristic.On)
            .onGet(this.getOn.bind(this))
            .onSet(this.setOn.bind(this));
        this.lightService.getCharacteristic(this.platform.Characteristic.Brightness)
            .onGet(this.getBrightness.bind(this))
            .onSet(this.setBrightness.bind(this));
        this.lightService.getCharacteristic(this.platform.Characteristic.Hue)
            .onGet(this.getHue.bind(this))
            .onSet(this.setHue.bind(this));
        this.lightService.getCharacteristic(this.platform.Characteristic.Saturation)
            .onGet(this.getSaturation.bind(this))
            .onSet(this.setSaturation.bind(this));
    }
    // Handle get requests from HomeKit for the lightbulb service
    async getOn() {
        await this.getLight();
        return this.lightState.On;
    }
    async getBrightness() {
        return this.lightState.Brightness;
    }
    async getHue() {
        return this.lightState.Hue;
    }
    async getSaturation() {
        return this.lightState.Saturation;
    }
    // handle set requests from HomeKit for the lightbulb service
    async setOn(value) {
        this.lightState.On = value;
        this.setLight();
    }
    async setBrightness(value) {
        this.lightState.Brightness = value;
        this.setLight();
    }
    async setHue(value) {
        this.lightState.Hue = value;
        this.setLight();
    }
    async setSaturation(value) {
        this.lightState.Saturation = value;
        this.setLight();
    }
    getLight = debounce(async () => {
        await new Promise((resolve, reject) => {
            exec(`${this.platform.pythonName} ${this.platform.scriptPath}/getLight.py`, (error, stdout) => {
                if (!error) {
                    this.lightState.On = (/true/i).test(stdout);
                    this.lightService.updateCharacteristic(this.platform.Characteristic.On, this.lightState.On);
                    this.platform.log.debug(`${this.accessory.context.device.displayName} getLight: ${this.lightState.On}`);
                    resolve();
                }
                else {
                    this.platform.log.error(`${this.accessory.context.device.displayName} getLight failed: ${error}`);
                    reject(error);
                }
            });
        });
    }, 1000);
    setLight = debounce(async () => {
        if (this.isStateEqual(this.lightState, this.prevLightState)) {
            return;
        }
        this.prevLightState = { ...this.lightState };
        await new Promise((resolve, reject) => {
            const param = `${this.lightState.On ? 1 : 0} ${this.lightState.Hue} ${this.lightState.Saturation} ${this.lightState.Brightness}`;
            exec(`${this.platform.pythonName} ${this.platform.scriptPath}/setLight.py ${param}`, (error) => {
                if (!error) {
                    this.platform.log.debug(`${this.accessory.context.device.displayName} setLight: ${param}`);
                    resolve();
                }
                else {
                    this.platform.log.error(`${this.accessory.context.device.displayName} setLight failed: ${error}`);
                    reject(error);
                }
            });
        });
    }, 100);
    isStateEqual(a, b) {
        return Object.keys(a).every(key => a[key] === b[key]);
    }
}
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