Leon Feng leon0707
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| function urlBase64ToUint8Array(base64String) { | |
| const padding = "=".repeat((4 - base64String.length % 4) % 4); | |
| const base64 = (base64String + padding) | |
| .replace(/\-/g, "+") | |
| .replace(/_/g, "/"); | |
| const rawData = window.atob(base64); | |
| const outputArray = new Uint8Array(rawData.length); | |
| for (let i = 0; i < rawData.length; ++i) { |
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| function subscribeUserToPush() { | |
| return navigator.serviceWorker.register('service-worker.js') | |
| .then(function(registration) { | |
| const subscribeOptions = { | |
| userVisibleOnly: true, | |
| applicationServerKey: <public key ArrayBuffer not string> | |
| }; | |
| return registration.pushManager.subscribe(subscribeOptions); | |
| }) | |
| .then(function(pushSubscription) { |
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| var CACHE_NAME = 'my-site-cache-v1'; | |
| var urlsToCache = [ | |
| '/', | |
| '/styles/main.css', | |
| '/script/main.js' | |
| ]; | |
| self.addEventListener('install', function(event) { | |
| // Perform install steps | |
| event.waitUntil( |
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| // client.js | |
| if ('serviceWorker' in navigator) { | |
| // register a service worker for this site | |
| navigator.serviceWorker.register('cache-worker.js'); | |
| navigator.serviceWorker.ready | |
| .then((reg) => { | |
| // registration worked | |
| console.log('Registration succeeded. Scope is ' + reg.scope); | |
| }).catch((error) => { | |
| // registration failed |
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| // some old browsers don't support web worker | |
| if (window.Worker) { | |
| // create a worker thread | |
| const worker = new Worker('web_worker.js'); | |
| // send the first msg to worker | |
| worker.postMessage('hello worker'); | |
| worker.addEventListener('message', function(event) { | |
| if (event.data === 'msg received, ack') { | |
| console.log('main thread received the ack'); |
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| // web-worker.js | |
| self.addEventListener('message', (event) => { | |
| console.log('worker receives a msg'); | |
| if (event.data === 'close your thread') { | |
| console.log('close msg received'); | |
| try { | |
| self.close(); | |
| // this thread is terminated. | |
| } catch (error) { | |
| self.postMessage('cannot terminated by itself'); |
leon0707
/ mac_queue.py
Last active
January 20, 2020 21:55
_semlock._get_value() NotImplementedError on mac
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| ''' | |
| qsize raises NotImplementedError on Unix platforms like Mac OS X where sem_getvalue() is not implemented. | |
| https://docs.python.org/3.6/library/multiprocessing.html#multiprocessing.Queue.qsize | |
| ''' | |
| import multiprocessing.queues | |
| from queue import Empty, Full | |
| class SharedCounter(object): | |
| """ A synchronized shared counter. |
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| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <div id="root"></div> | |
| <script src="https://unpkg.com/[email protected]/umd/react.production.min.js"></script> | |
| <script src="https://unpkg.com/[email protected]/umd/react-dom.production.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js" charset="utf-8"></script> | |
| <script type="text/babel"> | |
| function Greeter(props) { | |
| return <div>Hello {props.user}</div>; |
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| #!/bin/bash | |
| sudo apt-get remove docker docker-engine docker.io | |
| sudo apt-get update | |
| sudo apt-get install htop apt-transport-https ca-certificates curl software-properties-common -y | |
| curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - | |
| sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | |
| sudo apt-get update | |
| sudo apt-get install docker-ce docker-compose -y |
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