blinky/libs/blinkstick.js

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const logger = require('./logger');
const blinkstick = require('blinkstick');
const LEDS_ALL = 'all';
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const MODE_SET = 'set';
const MODE_MORPH = 'morph';
const MODE_BLINK = 'blink';
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const MODE_PULSE = 'pulse';
const MODE_POWEROFF = 'poweroff';
const LEDS_ANIMATED = [];
const LEDS_STOP = [];
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// find connected blinkstick(s)
async function findBlinkstick(index) {
let blinksticks = blinkstick.findAll();
if (blinksticks.length === 0) {
throw new Error('could not find any blinkstick');
}
if (index === undefined) {
index = 0;
}
if (index <= blinksticks.length) {
return blinksticks[index];
}
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}
// simple animation (set the color / morph to color)
async function simple(config) {
await stopLedsAccordingly(config);
config.timestamp = new Date().getTime();
let indices = getIndices(config);
for (let index = 0; index < indices.length; index++) {
await setLedAnimated(indices[index]);
await singleAnimation(JSON.parse(JSON.stringify(config)), indices[index]);
await clearLedState(indices[index]);
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}
return {
status: 'ok',
color: config.color,
indices: indices,
time: (new Date().getTime() - config.timestamp) + 'ms'
};
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}
// complex animation (pulse / blink)
async function complex(config) {
if (config.timestamp === undefined) {
await stopLedsAccordingly(config);
config.timestamp = new Date().getTime();
}
let indices = getIndices(config);
for (let index = 0; index < indices.length; index++) {
if (shouldLedFinish(config)) {
await clearLedState(indices[index]);
return {status: 'ok', time: (new Date().getTime() - config.timestamp) + 'ms'};
}
await setLedAnimated(indices[index]);
await singleAnimation(JSON.parse(JSON.stringify(config)), indices[index]);
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if (config.options.index === LEDS_ALL) {
await clearLedState(indices[index]);
}
config.repetitions.done++;
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}
return complex(config);
}
// power the blinkstick (or just a specific led) off
async function powerOff(config) {
config.timestamp = new Date().getTime();
let indices = getIndices(config);
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await forceStop(config.options.index);
for (let index = 0; index < indices.length; index++) {
await singleAnimation(JSON.parse(JSON.stringify(config)), indices[index]);
logger.info('led \'' + indices[index] + '\' powered off');
}
if (config.options.index === LEDS_ALL) {
const blinkstick = await findBlinkstick();
blinkstick.stop();
blinkstick.turnOff();
logger.info('blinkstick powered off');
}
return {status: 'ok', indices: indices, time: (new Date().getTime() - config.timestamp) + 'ms'};
}
// animations
async function singleAnimation(config, index) {
config.options.index = index;
const blinkstick = await findBlinkstick();
return await new Promise((resolve, reject) => {
logger.debug('changing color of led \'' + config.options.index + '\' to \'' + config.color + '\' (mode: ' + config.mode + ')...');
switch (config.mode) {
case MODE_MORPH:
blinkstick.morph(config.color, config.options, callback);
break;
case MODE_BLINK:
blinkstick.blink(config.color, config.options, callback);
break;
case MODE_PULSE:
blinkstick.pulse(config.color, config.options, callback);
break;
default:
blinkstick.setColor(config.color, config.options, callback);
break;
}
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function callback(err) {
if (err) {
reject(new Error('changing color of led \'' + config.options.index + '\' to \'' + config.color + '\' encountered an error > ' + err));
}
logger.debug('changed color of led \'' + config.options.index + '\' to \'' + config.color + '\' (mode: ' + config.mode + ')');
resolve();
}
});
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}
async function stopLedsAccordingly(config) {
if (config.options.index === LEDS_ALL) {
return await powerOff({
id: Math.random(),
mode: MODE_POWEROFF,
color: '#000000',
options: {index: LEDS_ALL}
});
}
return stopLedAnimation(config.options.index);
}
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async function forceStop(index) {
if (index === LEDS_ALL) {
LEDS_STOP.push(LEDS_ALL);
return await new Promise((resolve, reject) => {
waitForAllAnimationsEnd(() => {
resolve();
});
});
}
setLedStopping(index);
return await new Promise((resolve, reject) => {
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waitForAnimationEnd(index, () => {
resolve();
});
});
}
function shouldLedFinish(config) {
if (isLedStopping(config.options.index)) {
return true;
}
if (config.mode === MODE_BLINK || config.mode === MODE_PULSE) {
return config.repetitions.max !== 0 && config.repetitions.done >= config.repetitions.max;
}
return false;
}
// led / index helper functions
function getIndices(blinkstickConfig) {
if (blinkstickConfig.options.index === LEDS_ALL) {
return [0, 1, 2, 3, 4, 5, 6, 7];
}
return [blinkstickConfig.options.index];
}
function setLedAnimated(index) {
if (isLedAnimated(index)) {
return;
}
LEDS_ANIMATED.push(index);
}
function setLedStopping(index) {
if (!isLedAnimated(index) || isLedStopping(index)) {
return;
}
LEDS_STOP.push(index);
}
function clearLedState(index) {
if (index === LEDS_ALL) {
LEDS_ANIMATED.length = 0;
return;
}
LEDS_ANIMATED.splice(LEDS_ANIMATED.indexOf(index), 1);
}
function isLedAnimated(index) {
return LEDS_ANIMATED.includes(index);
}
function isLedStopping(index) {
if (LEDS_STOP.includes(LEDS_ALL)) {
return true;
}
return LEDS_STOP.includes(index);
}
function stopLedAnimation(index) {
setLedStopping(index);
return new Promise((resolve, reject) => {
waitForAnimationEnd(index, () => {
resolve();
});
});
}
function waitForAnimationEnd(index, callback) {
if (!isLedAnimated(index)) {
LEDS_STOP.splice(LEDS_STOP.indexOf(index), 1);
return callback();
}
setTimeout(() => {
waitForAnimationEnd(index, callback);
}, 100);
}
function waitForAllAnimationsEnd(callback) {
if (LEDS_ANIMATED.length === 0) {
LEDS_STOP.length = 0;
return callback();
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}
setTimeout(() => {
waitForAllAnimationsEnd(callback);
}, 100);
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}
function isInfiniteAnimation(config) {
if (config.mode !== MODE_BLINK && config.mode !== MODE_PULSE) {
return false;
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}
return config.repetitions.max === 0;
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}
// exports
module.exports = {
simple,
complex,
powerOff,
isInfiniteAnimation,
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LEDS_ALL,
MODE_SET,
MODE_MORPH,
MODE_BLINK,
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MODE_PULSE,
MODE_POWEROFF
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};