投稿時間:2021-12-17 04:34:57 RSSフィード2021-12-17 04:00 分まとめ(39件)

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IT	気になる、記になる…	Amazon、｢Echo Show 5｣と｢Echo Show 8｣をそれぞれ2台同時購入で実質1台無料になるセールを開催中	https://taisy0.com/2021/12/17/149861.html	amazon	2021-12-16 18:49:48
IT	気になる、記になる…	Amazon、Kindleストアで｢KADOKAWA 年末年始キャンペーン｣のセールを開催中 − 7000冊以上が最大70％オフに	https://taisy0.com/2021/12/17/149858.html	amazon	2021-12-16 18:39:01
IT	気になる、記になる…	Amazon、Kindleストアで5冊同時購入でさらに15％ポイント還元を行うキャンペーンを開催中 − 7万冊以上が対象	https://taisy0.com/2021/12/17/149855.html	amazon	2021-12-16 18:34:11
IT	気になる、記になる…	Apple、開発者に対し｢macOS 12.2 beta 1｣をリリース	https://taisy0.com/2021/12/17/149852.html	apple	2021-12-16 18:26:14
IT	気になる、記になる…	イオンカード、Apple PayのWAONへのチャージで300WAONポイントが貰えるキャンペーンを開始	https://taisy0.com/2021/12/17/149849.html	applepay	2021-12-16 18:22:48
IT	気になる、記になる…	写真編集アプリ｢Pixelmator Photo｣のiPhone版が登場	https://taisy0.com/2021/12/17/149845.html	iphone	2021-12-16 18:14:04
python	Pythonタグが付けられた新着投稿 - Qiita	これからrakuten_rss(Python用の楽天RSSを使うためのモジュール)を使おうとしている人へ。	https://qiita.com/yudaiyamashita/items/b67a6edd48e63ad9a4bc	で上手くいかないときはpipinstallダウンロードしたものをフォルダに直接入れるディレクトリ構造を以下の様にするlibddeclientpyrakutenrsspy実行したいpythonファイルサンプルfromrakutenrssimportrssrssdictfetchopenrssT始値outputrssT現在値outputrssT銘柄名称output東京電力HDMarketSpeedとRealSpreadSheet起動楽天証券口座を開設したらマイページにログインして、RSSとマーケットスピードをインストールする。	2021-12-17 03:53:17
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Unity　DirectionalLightの色を変更したときの3Dオブジェクトの色変更を動的に行いたい	https://teratail.com/questions/374224?rss=all	UnityDirectionalLightの色を変更したときのDオブジェクトの色変更を動的に行いたいバージョンUnityモバイル向けアプリの開発Editor上ではDirectionalLightの色を変えると、Dモデルの色がDirectionalLightに影響されたものに変わります。	2021-12-17 03:51:26
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	nsupdateをJavaのコードで実行	https://teratail.com/questions/374223?rss=all	nsupdateをJavaのコードで実行nsupdateコマンドをJavaのコード内で実行をしたいコード内でDNSサーバへFQDNの登録を行うため、nsupdateコマンドを使用したいです。	2021-12-17 03:46:30
Docker	dockerタグが付けられた新着投稿 - Qiita	Let's try Ignition Fortress	https://qiita.com/tomoyafujita/items/e3873608019d55cca250	Let x s try Ignition FortressLet s try Ignition Fortressout of curiosity just wanted to try out Ignition Gazebo Simulator from source code build EnvironmentUbuntu Docker ContainerNvidia Runtime AccelerationIgnition FortressNvidia Runtimeto access hardware via container we need to install nvidia docker which enables backend runtime to be issued by docker gpus option the procedure is really easy and described in container toolkit install guide with nvidia container runtime we can see that it can access GPUs from container as following gt docker run rm gpus all nvidia cuda base nvidia smiThu Dec NVIDIA SMI Driver Version CUDA Version GPU Name Persistence M Bus Id Disp A Volatile Uncorr ECC Fan Temp Perf Pwr Usage Cap Memory Usage GPU Util Compute M MIG M GeForce GTX Off On N A C P N A W MiB MiB Default N A Processes GPU GI CI PID Type Process name GPU Memory ID ID Usage 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ignition physics ExpectData operator const ignition physics ExpectData amp first required here class SpecifyData root docker ws ignition ws src ign physics src SpecifyData TEST cc In member function virtual void SpecifyData Copy Test TestBody root docker ws ignition ws src ign physics src SpecifyData TEST cc note synthesized method ignition physics SpecifyData ignition physics ExpectData gt amp ignition physics SpecifyData ignition physics ExpectData gt operator const ignition physics SpecifyData ignition physics ExpectData gt amp first required here opEqData data then start sample world ign gazebo shapes sdf v What s nextprobably try some examples from ros ign to comprehend how it works Reference	2021-12-17 03:10:43
Azure	Azureタグが付けられた新着投稿 - Qiita	Azure Pipelinesでジョブの実行に承認などを挟み一時的に止める	https://qiita.com/fukasawah/items/7827df5e645f5bdec992	BuildFunctionsジョブが実行された後のdeploymentジョブで承認されることを期待していましたが・・・この辺りの挙動はドキュメントに書いてありそうですが、ぱっとすぐ見つけられなかったので「とりあえずステージを分けましょう」という気持ちになりました。	2021-12-17 03:47:16
技術ブログ	Developers.IO	Ticket Schedules in Zendesk	https://dev.classmethod.jp/articles/ticket-schedules-in-zendesk/	Ticket Schedules in ZendeskWhat is a Ticket Schedule Schedules are used in reporting triggers views and SLA policies They allow you t	2021-12-16 18:16:25
海外TECH	MakeUseOf	How to Fix a Google Home That Won't Connect to Wi-Fi	https://www.makeuseof.com/how-to-fix-google-home-will-not-connect-to-wifi/	connection	2021-12-16 18:33:41
海外TECH	MakeUseOf	How to Use the Best Parts of the Windows 11 22504 Update	https://www.makeuseof.com/windows-11-update-22504-best-parts/	interesting	2021-12-16 18:15:39
海外TECH	DEV Community	Hi, i'm new here and new in programming too.	https://dev.to/elbeek/hi-im-new-here-and-new-in-programming-too-38c0	Hi i x m new here and new in programming too My name is Elbeek i am learning C now and i need some help for example What is the best courses is C language useful this days Can i have a job without colleg but i have online certificate	2021-12-16 18:49:21
海外TECH	DEV Community	Understanding and Implementing OAuth2 In Node.js	https://dev.to/honeybadger/understanding-and-implementing-oauth2-in-nodejs-cp3	Understanding and Implementing OAuth In Node jsThis article was originally written by Diogo Souza on the Honeybadger Developer Blog OAuth is the most widely used and accepted industry standard protocol for authorization As a protocol it provides a bunch of tools patterns and best practices to help developers with the arduous task of accomplishing authorization flows for all sorts of applications such as web mobile and embedded In this article I ll walk you through some of the essentials of OAuth in a practical way The goal is to demonstrate how this famous protocol works behind the scenes along with Node js So What About OAuth There are a lot of misconceptions and over complications when it comes to understanding what OAuth is really about OAuth has a couple of predefined flows that you can use on your projects however some of them will not apply to your situation Here we ll demonstrate a scenario in which the interested party who owns the web application in development in this case you makes use of a third party system to infer authorization within the application Among the third party systems you may consider the big players such as Google Facebook or in our case GitHub Authorization upon Facebook s systems Typically OAuth s most commonly used flow is divided into three main steps Your application pops up a new window for the third party authorization app asking the user who must have an account and be logged in on the system to grant permission for your application and then be able to take actions on his her behalf Once properly authenticated and authorized the third party app acknowledges the permission and redirects the user back to your app via a pre configured URL Your application exposes an endpoint for such callback operations and hits the third party provider API to ask for an access token based on the response code returned by the previous redirect process If you don t want to delegate the process of keeping users login information and instead want to handle the authorization on your own you can create an OAuth server This is what many companies do today due to the number of customizations required to meet their needs Let s look at this scenario more closely and see how Node js deals with it Environment SetupFor this article we ll be using Node js and Yarn as the default package manager Node is on version v to be specific However most of the versions higher than should work just fine Make sure to run each of the official installation steps to have them set up in case you still don t For this tutorial we ll create two different applications one for the client in React and another for the server capabilities It s important to know that this far although you can perfectly build your OAuth server from scratch using frameworks such as the node oauth server we ll make use of GitHub s capabilities for the sake of simplicity There are too many details around the ability to set up an OAuth server properly that we won t cover for now However in case you d like to adventure yourself into it the server project we ll create will be more than adequate for the role of OAuth s server host GitHub App ConfigFor this tutorial we ll make use of the powerful GitHub OAuth API GitHub allows you to create an application under your account and provides you with some OAuth client credentials to use in other applications This way you can easily allow users of your application to log in via their GitHub accounts So let s create a new application by clicking this link Make sure to fill in all the fields as shown in the image below Registering a new OAuth application The Authorization callback URL is the most important field because it demarcates where GitHub should redirect the user to once the authorization process is finished Note that you can enter any URI you prefer Click the Register application button and you may see a subsequent screen showing the Client ID and your Client secrets Client ID and secrets Once you get there you need to click the button to generate a new client secret Make sure to copy paste it to a safe place before leaving this screen since you won t be able to see it again in the future The Server ProjectLet s get back to project creation Pick up a folder of your choice and run the following command mkdir oauth node servercd oauth node servernpm initAgain leave all the options as they re presented to you until the end Then run the following command to install the required NPM dependencies npm install axios express corsAxios will be used to make HTTP request calls to the GitHub OAuth servers Express will be our version of the server and cors is just used to avoid conflicts with the browser s Same Origin policies The code for the server is very simple and can be found in the following code Make sure to add it to a file named index js const express require express const axios require axios var cors require cors const CLIENT ID lt YOUR GITHUB CLIENT ID gt const CLIENT SECRET lt YOUR GITHUB CLIENT SECRET gt const GITHUB URL const app express app use cors credentials true origin true app get oauth redirect req res gt axios method POST url GITHUB URL client id CLIENT ID amp client secret CLIENT SECRET amp code req query code headers Accept application json then response gt res redirect http localhost access token response data access token const PORT app listen PORT gt console log Listening at port PORT What we re doing on this server is simply proxying requests from the GitHub platform to the oauth redirect path once the authorization steps are concluded When it s done we need to make sure to call it again to retrieve a valid access token To do this GitHub needs to know who s calling to check whether the caller has such access The only way GitHub can know this is via the client id and client secret provided by your GitHub application so they may be passed as parameters to the request Also note that we re sending a query param called code that GitHub provides when calling the callback URL as a second security check of its own Otherwise the request would fail If the second GitHub s call is successful then we may redirect the response and all of its content to the React client application listening to port Before heading to the next section make sure everything s working fine by running the following command node index jswhich may in turn produce the output shown below ➜Listening at port The Client ProjectThe client project will get some help from React and Bootstrap to make things aesthetically cleaner Leave the current server folder and run the following command to create the client project npx create react app oauth node appTo make things simpler for the client we re also making use of the create react app tool After you run it make sure to leave all the options as defaults until the end Then run the following command to add the required Node dependencies yarn add react bootstrap axiosMake sure to add this CSS import in your index js file to inject Bootstrap s styles into the React project import bootstrap dist css bootstrap min css Great Without further ado let s move on and substitute your App js file content with the following import Button from react bootstrap Button import CardDeck from react bootstrap CardDeck import Card from react bootstrap Card import useEffect useState from react import axios from axios import App css function App const loggedIn setLoggedIn useState false const user setUser useState null useEffect gt const token new URLSearchParams window location search get access token axios get http localhost proxy user headers Authorization token token then res gt setUser res data setLoggedIn true catch error gt console log error error return lt div className App text center container fluid gt loggedIn lt gt lt img className mb src width gt lt img gt lt h className h mb font weight normal gt Sign in with GitHub lt h gt lt Button type primary className btn size lg href redirect uri http localhost oauth redirect gt Sign in lt Button gt lt gt lt gt lt h gt Welcome lt h gt lt p gt This is a simple integration between OAuth on GitHub with Node js lt p gt lt CardDeck gt Array map e i gt lt Card style maxWidth margin auto gt lt Card Img variant top src user avatar url gt lt Card Body gt lt Card Title gt user name lt Card Title gt lt Card Text gt user bio lt Card Text gt lt Button variant primary target blank href user html url gt GitHub Profile lt Button gt lt Card Body gt lt Card gt lt CardDeck gt lt gt lt div gt export default App Since we re using the latest version of React we ll make sure to use only React hooks for the whole implementation Let s break it down a bit for a better understanding First we make use of the useState hook to create two state objects a Boolean to detect whether the user is logged in and a user object to hold GitHub s response Both with the respective setter methods Then we set up a useEffect hook to load only once when the whole component page is loaded and check for the user s details based on the access token provided via query param If the param is present let s set both the user and loggedIn state values so that the logic to render the component will consider them Otherwise we simply present the Sign up component The render function takes care of displaying the proper component based on the current authorization state We won t go into detail about how React components work here but feel free to change them with as much of the cool stuff from Bootstrap as you want Note that we re providing GitHub with the URL for the client id on the button Make sure to change it with yours You may also have noticed that there s a third localhost URL on this code listing http localhost proxy user The reason is that if we try to access GitHub directly from the UI we will face some cors related issues The easiest way to deal with this is by creating a local proxy to handle the cors domain conversions for us The local cors proxy NPM module is the perfect choice for this task To install it globally simply run the following command npm install g local cors proxyThen on the same terminal window run another command to start it lcp proxyUrl You may see the following output stating that everything went well Starting up the cors proxy server It gives you a port at localhost usually at to proxy to that specific URL Adding Some StyleWe also need to add some styling before proceeding to the tests Since we already have an index css file with some CSS styles let s switch its content with the following html body height body display ms flexbox display webkit box display flex ms flex align center ms flex pack center webkit box align center align items center webkit box pack center justify content center padding top px padding bottom px background color fff div root width TestingTo test the client implementation you may run the following command in the client s root folder npm startLook for errors in the logs and wait until React loads the application on your web browser You may see the following screen with the Sign in button Before clicking it make sure to have both the server app and the proxy up Sign in with GitHub After clicking the Sign in button you ll be redirected to the GitHub authorization page as shown in the image below GitHub authorization page In case you re not properly logged in GitHub will take care of the whole authentication flow by itself It s one of the great benefits of this approach you can delegate user authentication Click on the Authorize button and GitHub will also take care of the redirecting process after it s finished In the end you may see the following screen Welcome page with GitHub user information Another test that you can do right after is trying to access the root URI once again and click the Sign in button You may see that the login process goes smoothly without an authorization page because once the authorization has been done its state persists until you revoke them Wrapping UpYou may find the source code for this tutorial here It s not uncommon to hear from many beginner devs that OAuth is super complicated and too difficult for them to handle The protocol itself is indeed large however you don t have to dig into it all at once Many parts of the protocol aren t commonly used Start simple and then upgrade in small but concise chunks There s more to learn about it such as scopes authorities and permissions FA As the next step I recommend that you think about storing these access tokens in a database for the server project as well as in your browser s local storage for the client part It be great for your users if they could close the browser and come back later to find that the session is still open	2021-12-16 18:25:57
海外TECH	DEV Community	Build a p2p network and release your cryptocurrency	https://dev.to/freakcdev297/build-a-p2p-network-and-release-your-cryptocurrency-clf	Build a pp network and release your cryptocurrencyHi all in the previous article I have covered how to create a simple transaction system for our blockchain So today I will build the core component of our cryptocurrency the peer to peer pp network It s not only required for a blockchain to work but after building it we can really release our coins Yes we are at that stage already I have also created a tutorial on Youtube check it our for better understanding What is a pp network First we have to understand what is a peer to peer network In the last parts I have talked about it a few times but it s not really ideal yet so I will dig deeper about it in this article Before we get on to that we need to understand the client server model first In our life pretty much everything we use currently follows the client server model The network works by having a server and every machines will connect to that server You can send requests to the server and the server can send back responses Think of the system as a company and the boss is the server The boss is the one who makes decisions and controls every action of the application But in a distributed peer to peer model machines called nodes can send messages to each other without having any rd party system involved Think of it as a group of friends working together People can work independently and decisions will be made by the majority In a cryptocurrency s network people should be able to at least send transactions and suggest new blocks Without futher ado let s code What and how we are trying to achieveWe would need a network where nodes can connect with and send messages to each other in a peer to peer fashion After that we will add functionalities like broadcasting transactions suggesting new blocks send the chain and chain s information I will be using WebSocket a TCP based protocol please learn about it to have a better understanding with what I will be doing Also please read the comments in the code I use them to explain individual functionalities SetupI will use a light package called ws just to stay simple in this article Simply install it using npm npm install ws Basic concepts of ws Import the packageconst WS require ws Create a serverconst server new WS Server port SOME PORT Listens for connectionsserver on connection async socket req gt This event handler will be triggered every time somebody send us connections Get the socket from an addressconst socket new WS SOME ADDRESS Open a connectionsocket on open gt This event handler will be triggered when a connection is opened Close a connectionsocket on close gt This event handler will be triggered when the connection is closed Listens for messagessocket on message message gt message is message yes A basic nodeCreate a new file call it anything you want Basically we will have the basic variables for PORT the list of peers we are connecting PEERS our address MY ADDRESS I use process env abcxyz so that you can configure the node easily through command line BTW I will import the required stuff tooconst crypto require crypto SHA message gt crypto createHash sha update message digest hex const Block Transaction JeChain require jechain const EC require elliptic ec ec new EC secpk const MINT PRIVATE ADDRESS aadaebacdeadbfdceeeede const MINT KEY PAIR ec keyFromPrivate MINT PRIVATE ADDRESS hex const MINT PUBLIC ADDRESS MINT KEY PAIR getPublic hex Your key pairconst privateKey process env PRIVATE KEY dcacaeeafedeccabed const keyPair ec keyFromPrivate privateKey hex const publicKey keyPair getPublic hex The real new codeconst WS require ws const PORT process env PORT const PEERS process env PEERS process env PEERS split const MY ADDRESS process env MY ADDRESS ws localhost const server new WS Server port PORT console log Listening on PORT PORT I will add this one line for error handling process on uncaughtException err gt console log err The MINTING address should never be changed and we are going to change the old genesis block too const initalCoinRelease new Transaction MINT PUBLIC ADDRESS afeceebfbfdcbcafbacdaaeacddbcdacffdefcfffddbbddccd We are releasing coins and send it to a guy with the address above which is basically just from this private key dcacaeeafedeccabedRemember to replace the old mint key pair with the new one too Now let s have a way to connect to other nodes as well as listen to other nodes connections To implement this system we need a function to connect and use server on connection for listening to connections The connect function should be able to connect to an address then send it our address then the connection handler of that address will connect to our address using the message given A message is a string in this case a JSON which have a form like this type data What we need in this case is type TYPE HANDSHAKE data Our address and our connected nodes address address x address y I will create a function to generate messages for convenience function produceMessage type data return type data Now let s implement the main system THE CONNECTION LISTENERserver on connection async socket req gt Listens for messages socket on message message gt Parse the message from a JSON into an object const message JSON parse message switch message type case TYPE HANDSHAKE const nodes message data nodes forEach node gt connect node We will need to handle more types of messages in the future so I have used a switch case THE CONNECT FUNCTIONasync function connect address Get the socket from address const socket new WS address Connect to the socket using the open event socket on open gt Send our address to the target socket send JSON stringify produceMessage TYPE HANDSHAKE MY ADDRESS To actually do stuff in the future we would want to store connected sockets and addresses into one array Also by doing this we can send other nodes the address of the node that has just been connected to us let opened connected I will use opened for holding both sockets and addresses connected is for addresses only async function connect address We will only connect to the node if we haven t and we should not be able to connect to ourself if connected find peerAddress gt peerAddress address amp amp address MY ADDRESS const socket new WS address socket on open gt I will use the spread operator to include our connected nodes addresses into the message s body and send it socket send JSON stringify produceMessage TYPE HANDSHAKE MY ADDRESS connected We should give other nodes this one s address and ask them to connect opened forEach node gt node socket send JSON stringify produceMessage TYPE HANDSHAKE address If opened already contained the address we will not push if opened find peer gt peer address address amp amp address MY ADDRESS opened push socket address If connected already contained the address we will not push if connected find peerAddress gt peerAddress address amp amp address MY ADDRESS connected push address Two upper if statements exist because of the problem of asynchronous codes Since they are running concurrently the first if statement can be passed easily so there will be duplications When they disconnect we must remove them from our connected list socket on close gt opened splice connected indexOf address connected splice connected indexOf address To connect to all prefixed peers you can add this line in PEERS forEach peer gt connect peer Integrate our blockchain into the network What do we need to do Alright now that we have our node running let s start diving into the real deal part of the article cryptocurrency To create a cryptocurrency we would need to be able to broadcast transactions suggest newly mined blocks New nodes should be able to ask other nodes for their chains too Adding necessary stuffBecause when we send messages we are effectively parsing objects to JSON meaning that the methods of an object in this case they are the transactions blocks blockchains will disappear We can solve this problem by making our methods static so we can re use them without having to touch the real objects themselves And in the previous article the validation methods of blocks and transactions are not really ideal so let s update them while we are turning everything static static hasValidTransactions block chain let gas reward block data forEach transaction gt if transaction from MINT PUBLIC ADDRESS gas transaction gas else reward transaction amount return reward gas chain reward amp amp block data every transaction gt Transaction isValid transaction chain amp amp block data filter transaction gt transaction from MINT PUBLIC ADDRESS length static isValid blockchain for let i i lt blockchain chain length i const currentBlock blockchain chain i const prevBlock blockchain chain i if currentBlock hash Block getHash currentBlock prevBlock hash currentBlock prevHash Block hasValidTransactions currentBlock blockchain return false return true static isValid tx chain return tx from amp amp tx to amp amp tx amount amp amp chain getBalance tx from gt tx amount tx gas tx from MINT PUBLIC ADDRESS amp amp ec keyFromPublic tx from hex verify SHA tx from tx to tx amount tx gas tx signature static getHash block return SHA block prevHash block timestamp JSON stringify block data block nonce Related methods constructor timestamp Date now toString data this timestamp timestamp this data data this prevHash this hash Block getHash this this nonce mine difficulty while this hash startsWith Array difficulty join this nonce this hash Block getHash this addBlock block block prevHash this getLastBlock hash block hash Block getHash block block mine this difficulty this chain push Object freeze block this difficulty Date now parseInt this getLastBlock timestamp lt this blockTime addTransaction transaction if Transaction isValid transaction this this transactions push transaction TransactionsFirst I will create a handy dandy sendMessage function to send messages to nodes easier function sendMessage message opened forEach node gt node socket send JSON stringify message Now let s handle the messages A message for broadcasting transactions will look like this type TYPE CREATE TRANSACTION data the transaction object goes here In our message handler we will create a new case which simply uses the handy dandy addTransactions method we have created in the last part switch message type case TYPE CREATE TRANSACTION const transaction message data JeChain addTransaction transaction break And you can send a transaction like this sendMessage produceMessage TYPE CREATE TRANSACTION someTransaction You must also add the transaction to your pool JeChain addTransaction someTransaction Mining and sending new blocksNow let s handle the new block s suggestion messages This is by far the hardest most bulky part to implement so let s get going shall we The message will look like this type TYPE REPLACE CHAIN data new block new difficulty How would we handle this message The simplest thing we would do first is to check if the block is valid or not then we will add it to the chain and update the difficulty The block is valid when It has valid transactions the transactions are in our transaction pool the transactions are valid according to our old methods It has a valid hash matches with the block s information also called block header It has a valid difficulty it can t be greater or less than difficulty plus minus It has a valid timestamp must not be greater than the time they sent us and less than the previous block s timestamp This is not really a fulfill way to adjust difficulty but at least it shouldn t create too much damage switch message type case TYPE REPLACE CHAIN const newBlock newDiff message data We are checking if the transactions exist in the pool by removing elements from transactions of the block if they exist in the pool Then we simply use theirTx length to check if the all elements are removed meaning all transactions are in the pool const ourTx JeChain transactions map tx gt JSON stringify tx const theirTx newBlock data filter tx gt tx from MINT PUBLIC ADDRESS map tx gt JSON stringify tx const n theirTx length if newBlock prevHash JeChain getLastBlock prevHash for let i i lt n i const index ourTx indexOf theirTx if index break ourTx splice index theirTx splice if theirTx length amp amp SHA JeChain getLastBlock hash newBlock timestamp JSON stringify newBlock data newBlock nonce newBlock hash amp amp newBlock hash startsWith Array JeChain difficulty join amp amp Block hasValidTransactions newBlock JeChain amp amp parseInt newBlock timestamp gt parseInt JeChain getLastBlock timestamp JeChain getLastBlock timestamp amp amp parseInt newBlock timestamp lt Date now amp amp JeChain getLastBlock hash newBlock prevHash amp amp newDiff JeChain difficulty newDiff JeChain difficulty JeChain chain push newBlock JeChain difficulty newDiff JeChain transactions ourTx map tx gt JSON parse tx break But turns out there s one really dangerous problem If one miner mines a block he wouldn t really know if his block came first or the other one sent to him came first Yes this does happen due to many impacts one of them is internet problem Imagine if someone mined a block before you and he had sent the block to other nodes already but due to some internet problem you can manage to finish mining the block after the message is received so the block sent will be invalid but it s in fact valid and you will be left behind There are many approaches to this but I have coined out a really simple system which leverages the use of majority s support We can affectively implement this functionality using a boolean variable called checking and setTimeout Basically the idea is that if the block s prevHash is equal to the latest block s prevHash then it s probably a block that needs checking for replacement We will set checking to true to indicates that we are checking then we will request other nodes for their latest block We will wait for a period of time which I have set to s using setTimeout then we will set checking to false cancelling the process and the block that appeared the most is likely the block we need I will also implement a system to skip on all similar blocks after we have had the correct answer let check let checked let checking false if newBlock prevHash JeChain getLastBlock prevHash If this case was found once simply just dismiss it else if checked includes JSON stringify newBlock prevHash JeChain chain JeChain chain length timestamp checked push JSON stringify JeChain getLastBlock prevHash JeChain chain JeChain chain length timestamp const position JeChain chain length checking true sendMessage produceMessage TYPE REQUEST CHECK MY ADDRESS setTimeout gt checking false let mostAppeared check check forEach group gt if check filter group gt group group length gt check filter group gt group mostAppeared length mostAppeared group const group JSON parse mostAppeared JeChain chain position group JeChain transactions group JeChain difficulty group check splice check length Note that the upper code is more of a proof of concept we often would like to check if the block is valid or not just to be safer There are faster cleaner more secure ways than this but this should do our job Let s create a way to handle TYPE REQUEST CHECK We will send back TYPE SEND CHECK so let s make one for that as well The message will look like this type TYPE REQUEST CHECK data address to send back type TYPE SEND CHECK data block transaction pool difficulty The handler case TYPE REQUEST CHECK Find the address and send back necessary data opened filter node gt node address message data socket send JSON stringify produceMessage TYPE SEND CHECK JSON stringify JeChain getLastBlock JeChain transactions JeChain difficulty break case TYPE SEND CHECK Only push to check if checking is enabled if checking check push message data break So the handler is finally done You can mine blocks like this if JeChain transactions length Note that technically you can choose your own transactions to mine but I would like to mine all transactions at once JeChain mineTransactions publicKey sendMessage produceMessage TYPE REPLACE CHAIN JeChain getLastBlock JeChain difficulty Sending chainsFor new nodes that have just joined the network there are ways to get the latest chain You can either get a chain from a trust worthy source or you can ask for the chain in the network Note that the size of a message is limited so we won t be able to send the whole chain we will send its blocks and information one by one We can implement the second solution like this let tempChain new Blockchain case TYPE SEND CHAIN const block finished message data if finished tempChain chain push block else if Blockchain isValid tempChain JeChain chain tempChain chain tempChain new Blockchain break case TYPE REQUEST CHAIN const socket opened filter node gt node address message data socket We will send the blocks continously for let i i lt JeChain chain length i socket send JSON stringify produceMessage TYPE SEND CHAIN block JeChain chain i finished i JeChain chain length break case TYPE REQUEST INFO opened filter node gt node address message data socket send TYPE SEND INFO JeChain difficulty JeChain transactions break case TYPE SEND INFO JeChain difficulty JeChain transactions message data break Note that you can send request chain to a trust worthy node or base on the majority Testing in localhostTo test I will start new consoles with different PORT MY ADDRESS and PRIVATE KEY For the first one I will set our peers to be empty and the key to be what the initial coin release points to For the other one I will set the peer list to be the first node to test if our handshake functionality work Then I m going to create a transaction in the first node and mine in the second node After seconds we will print out the opened array and the chain First node setTimeout gt const transaction new Transaction publicKey ecaecbdcdaefededdeedbbcdfffdbedfcaecfacbbcbbbaeacacdef transaction sign keyPair sendMessage produceMessage TYPE CREATE TRANSACTION transaction JeChain addTransaction transaction setTimeout gt console log opened console log JeChain Second node setTimeout gt if JeChain transactions length JeChain mineTransactions publicKey sendMessage produceMessage TYPE REPLACE CHAIN JeChain getLastBlock JeChain difficulty setTimeout gt console log opened console log JeChain It should look like this Nodes have connected to each others the block is mined the chain is synced Releasing our coin testing publicly Simply host a node publicly by using port forwarding also for each router you would have a different way to do port forwarding just simply look up online to see what suits your model using your PC or a VPS hosting service I have tested with my friend here My node which is the first node His node which is the second node We have did some port forwarding and we connected to each others public IP address Note that this network is not meant to be production ready but this network should be fine for now Source codeThe full source code used in this article can be found in this Github repo Or here with JeChain ShoutoutsI want to give appreciation to my friend Apple who have contributed to the code used in the article and Trey a really cool guy who enlightens me in constructing the network Check out Apple s Github account Check out Trey s website ContactsMy Twitter My Github My Youtube channel I have also created a tutorial on Youtube check it our for better understanding	2021-12-16 18:25:06
海外TECH	DEV Community	🤫 Something is cooking @ Medusa...	https://dev.to/medusajs/something-is-cooking-medusa-16a1	Something is cooking Medusa We wanted to just give you a bit of a sneak peak into what we are working on at Medusa right now Stay tuned and feel free to subscribe to our Product Hunt launch where we will reveal more Subscribe hereWhat is Medusa Medusa is the open source alternative to Shopify The solution comes with most of the same standard features as Shopify s backend e g EE order handling easy to use admin interface etc but is build headless and open source to maximize developer flexibility In addition is fixes some of the regular backend hurdles from Shopify such as full multi regional support local currency shipment and payment options and fully automated exchange claim handling	2021-12-16 18:05:49
Apple	AppleInsider - Frontpage News	Apple expanding Southern California office for in-house wireless chip development	https://appleinsider.com/articles/21/12/16/apple-expanding-southern-california-office-for-in-house-wireless-chip-development?utm_medium=rss	Apple expanding Southern California office for in house wireless chip developmentApple is hiring staff and building out a new office in Southern California to work on in house wireless silicon that could eventually reduce its reliance on third party chipmakers Apple expanding presence in Southern California for modem developmentThe company is reportedly looking to hire a half dozen engineers to develop wireless chips in the city of Irvine California Bloomberg reported Thursday Modem makers like Broadcom Skyworks and others have offices in the Irvine area which is between L A and San Diego Read more	2021-12-16 18:43:21
Apple	AppleInsider - Frontpage News	Apple seeds first developer beta of macOS 12.2	https://appleinsider.com/articles/21/12/16/apple-seeds-first-developer-beta-of-macos-122?utm_medium=rss	Apple seeds first developer beta of macOS Apple has issued its first developer beta build of macOS for testing marking the start of a new beta cycle for the Mac operating system The newest builds can be downloaded via the Apple Developer Center for those enrolled in the test program or via an over the air update on devices running the beta software Public betas typically arrive within a few days of the developer versions via the Apple Beta Software Program website The macOS beta arrives after Apple publicly released macOS on December That version underwent six betas including two release candidates before being provided to all users as an update Read more	2021-12-16 18:19:41
海外TECH	Engadget	Uber will test 'autonomous' food delivery sometime next year	https://www.engadget.com/uber-motional-food-delivery-partnership-183107550.html?src=rss	Uber will test x autonomous x food delivery sometime next yearUber and autonomous vehicle company Motional announced a partnership today for quot autonomous deliveries quot through Uber Eats As you might imagine there are some caveats nbsp The pilot is slated to launch at some point in quot early quot though Motional itself a partnership between Hyundai and Aptiv would not provide further details on timing The full array of food options normally available through Uber Eats also won t be available Instead customers will pick from quot a curated set of meal kits from select restaurants quot nbsp Nor will this joint venture really be quot driverless quot per se A Motional spokesperson told Engadget that quot we will be launching the service with safety operators present in the vehicle quot Not quite autonomous meal kit deliveries will be confined to Santa Monica California where a large portion of Motional s team works Other lingering questions for instance the number of vehicles Motional plans to put on public roads or what types of weather they ll be allowed to operate in remain unanswered Under its original leadership Uber initially planned to convert the semi professionalized cab driver workforce into a contingent one and then remove those overhead costs entirely by investing in self driving vehicles quot The reason Uber could be expensive is you re paying for the other dude in the car quot former CEO Travis Kalanick said in quot When there is no other dude in the car the cost of taking an Uber anywhere is cheaper quot Six years later the company sold off its self driving arm known as the Advanced Technologies Group to Aurora nbsp Since then Uber has pursued partnerships with outside self driving firms like Waymo Motional has an ongoing partnership with Uber s chief rival Lyft to launch an autonomous fleet in nbsp	2021-12-16 18:31:07
海外TECH	Engadget	TikTok rolls out 1080p uploads and more editing features	https://www.engadget.com/tiktok-1080p-uploads-high-definition-giphy-gif-cat-182203933.html?src=rss	TikTok rolls out p uploads and more editing featuresIt s a busy day for TikTok Not only has the company announced upcoming changes for the recommendation algorithm it s rolling out a bunch of editing features that should improve the look and maybe the sound of your videos nbsp Perhaps the most important update is support for p uploads in select countries You ll be able to share videos at that resolution by switching on the Upload HD setting from the quot More options quot section of the publishing page The app is offering an easy way to improve the overall look of a video With the new Visual Enhancement button TikTok says it will improve the exposure low light and color correction aspects with a single tap After you record or upload a video you can tap the Enhance button on the right panel If you don t like the changes tapping the button again will undo them Elsewhere the Green Screen effect now has Giphy integration so you can use a GIF from that platform s library as the background of a video There are more musical and animal voice effects too TikTok can turn your voice or other sounds into a cat s meow a flute or a suona a Chinese double reed horn You can try these out by tapping the Voice Effect button on the Editing page	2021-12-16 18:22:03
海外TECH	Engadget	Hyundai's MobED robot can elevate its wheels to navigate uneven surfaces	https://www.engadget.com/hyundai-mobed-annoucement-180932482.html?src=rss	Hyundai x s MobED robot can elevate its wheels to navigate uneven surfacesSpot and the rest of the Boston Dynamics family may get all the attention but Hyundai has a robotics division separate from the firm it acquired earlier in the year This week the automaker unveiled the Mobile Eccentric Droid or MobED a new mobility platform for taking on even the trickiest surfaces and uneven ground The company s Robotics Lab says it developed MobED to overcome the limitations of existing indoor and service robots Each of the robot s wheels features independent power and steering control systems that allow it to rotate in place and move in any direction It also has an eccentric drive system hence the name that allows it to independently adjust the height of each of its wheels As you can see from the video that means it can provide a stable platform for something as delicate as glass nbsp nbsp MobED can expand its wheelbase up to about inches when it needs as much stability as possible It can also contract to about inches when it finds itself in more complex environments All told the platform is approximately inches long inches wide and inches tall A kWh battery allows the robot to drive for approximately four hours on a single charge Outside of working as a service robot Hyundai envisions MobED helping out in places like the movie industry where film crews could mount their equipment to the platform It could also be used for deliveries and other purposes where stability is essential We ll get a chance to see more of the robot when Hyundai demos it at CES next month However the company hasn t said if it plans to commercialize MobED nbsp	2021-12-16 18:09:32
Cisco	Cisco Blog	Multi-Vendor Automation: The Song Remains the Same	https://blogs.cisco.com/sp/multi-vendor-automation-the-song-remains-the-same	Multi Vendor Automation The Song Remains the SamePeople in the industry are coming around to something we ve recognized and invested in for a few years now any viable automation strategy needs to span vendors and technology domains Networks are heterogeneous by nature and for automation tools to accommodate that the entire process needs to be automated not just part of it You need end to end insights instead of patchy islands of visibility	2021-12-16 18:24:01
海外TECH	WIRED	The 8 Best Smart Speakers With Alexa or Google Assistant	https://www.wired.com/story/best-smart-speakers	apple	2021-12-16 18:27:00
ニュース	BBC News - Home	Covid: Cases hit new record as booster drive continues	https://www.bbc.co.uk/news/uk-59688186?at_medium=RSS&at_campaign=KARANGA	chief	2021-12-16 18:31:41
ニュース	BBC News - Home	England & Wales get tough Nations League draws as Scotland face Republic of Ireland	https://www.bbc.co.uk/sport/football/59687769?at_medium=RSS&at_campaign=KARANGA	England amp Wales get tough Nations League draws as Scotland face Republic of IrelandEngland will face Italy who beat them in the Euro final and Germany in the group stage of the Nations League while Wales are drawn in the same group as Belgium and the Netherlands	2021-12-16 18:37:53
ニュース	BBC News - Home	Covid-19 in the UK: How many coronavirus cases are there in my area?	https://www.bbc.co.uk/news/uk-51768274?at_medium=RSS&at_campaign=KARANGA	cases	2021-12-16 18:05:28
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