extended config and functionality to cache found blinksticks and filter them by serial(s)

config.json

@@ -3,6 +3,12 @@
     "listen": "0.0.0.0",
     "port": 3000
   },
+  "blinkstick": {
+    "cache": true,
+    "serials": [
+      "BS006537-3.0"
+    ]
+  },
   "log": {
     "level": "debug",
     "timestamp": "DD.MM.YYYY HH:mm:ss:SS"

libs/blinkstick.js

@@ -1,7 +1,7 @@
 const logger = require('./logger');
 const blinkstick = require('blinkstick');
 
-const LEDS_ALL = 'all';
+const ALL = 'all';
 
 const MODE_SET = 'set';
 const MODE_MORPH = 'morph';
@@ -12,18 +12,40 @@ const MODE_POWEROFF = 'poweroff';
 const LEDS_ANIMATED = [];
 const LEDS_STOP = [];
 
+let blinksticks;
+
 // find connected blinkstick(s)
-async function findBlinkstick(index) {
-    let blinksticks = blinkstick.findAll();
+async function findBlinkstick(index, ignoreFilter) {
+    if (!global.config.blinkstick?.cache || blinksticks === undefined) {
+        blinksticks = blinkstick.findAll();
+    }
     if (blinksticks.length === 0) {
-        throw new Error('could not find any blinkstick');
+        throw new Error('could not find any blinkstick, make sure at least one blinkstick is connected');
     }
     if (index === undefined) {
         index = 0;
+    } else if (index !== ALL) {
+        index = parseInt(index);
+    }
+    if (isNaN(index)) {
+        index = 0;
+    }
+    if (global.config.blinkstick?.serials?.length > 0) {
+        blinksticks = blinksticks.filter((blinkstick) => {
+            return global.config.blinkstick.serials.includes(blinkstick.serial);
+        });
+        if (blinksticks.length === 0) {
+            throw new Error('could not find any blinkstick matching the defined serial(s)');
+        }
+    }
+
+    if (index > blinksticks.length - 1) {
+        throw new Error('there is no blinkstick for index \'' + index + '\'');
+    }
+    if (index === ALL) {
+        return blinksticks;
     }
-    if (index <= blinksticks.length) {
     return blinksticks[index];
-    }
 }
 
 // simple animation (set the color / morph to color)
@@ -58,7 +80,7 @@ async function complex(config) {
         }
         await setLedAnimated(indices[index]);
         await singleAnimation(JSON.parse(JSON.stringify(config)), indices[index]);
-        if (config.options.index === LEDS_ALL) {
+        if (config.options.index === ALL) {
             await clearLedState(indices[index]);
         }
         config.repetitions.done++;
@@ -75,7 +97,7 @@ async function powerOff(config) {
         await singleAnimation(JSON.parse(JSON.stringify(config)), indices[index]);
         logger.info('led \'' + indices[index] + '\' powered off');
     }
-    if (config.options.index === LEDS_ALL) {
+    if (config.options.index === ALL) {
         const blinkstick = await findBlinkstick();
         blinkstick.stop();
         blinkstick.turnOff();
@@ -116,20 +138,20 @@ async function singleAnimation(config, index) {
 }
 
 async function stopLedsAccordingly(config) {
-    if (config.options.index === LEDS_ALL) {
+    if (config.options.index === ALL) {
         return await powerOff({
             id: Math.random(),
             mode: MODE_POWEROFF,
             color: '#000000',
-            options: {index: LEDS_ALL}
+            options: {index: ALL}
         });
     }
     return stopLedAnimation(config.options.index);
 }
 
 async function forceStop(index) {
-    if (index === LEDS_ALL) {
-        LEDS_STOP.push(LEDS_ALL);
+    if (index === ALL) {
+        LEDS_STOP.push(ALL);
         return await new Promise((resolve, reject) => {
             waitForAllAnimationsEnd(() => {
                 resolve();
@@ -156,7 +178,7 @@ function shouldLedFinish(config) {
 
 // led / index helper functions
 function getIndices(blinkstickConfig) {
-    if (blinkstickConfig.options.index === LEDS_ALL) {
+    if (blinkstickConfig.options.index === ALL) {
         return [0, 1, 2, 3, 4, 5, 6, 7];
     }
     return [blinkstickConfig.options.index];
@@ -177,7 +199,7 @@ function setLedStopping(index) {
 }
 
 function clearLedState(index) {
-    if (index === LEDS_ALL) {
+    if (index === ALL) {
         LEDS_ANIMATED.length = 0;
         return;
     }
@@ -189,7 +211,7 @@ function isLedAnimated(index) {
 }
 
 function isLedStopping(index) {
-    if (LEDS_STOP.includes(LEDS_ALL)) {
+    if (LEDS_STOP.includes(ALL)) {
         return true;
     }
     return LEDS_STOP.includes(index);
@@ -233,11 +255,12 @@ function isInfiniteAnimation(config) {
 
 // exports
 module.exports = {
+    findBlinkstick,
     simple,
     complex,
     powerOff,
     isInfiniteAnimation,
-    LEDS_ALL,
+    ALL,
     MODE_SET,
     MODE_MORPH,
     MODE_BLINK,