投稿時間:2022-02-25 20:31:06 RSSフィード2022-02-25 20:00 分まとめ(40件)

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TECH	Engadget Japanese	車のバッテリー上がりや空気減を解決。ライト機能も搭載した「BoostREVO(TM) 4in1モバイルギア」	https://japanese.engadget.com/boost-revo-104529704.html	車やバイクで遠出した時、駐車中にバッテリーが上がったり、いつの間にかタイヤがパンクしていたりなんてトラブルに遭った経験はありませんか特に人通りが無い場所や夜中にトラブルに遭うと助けもなく、途方に暮れてしまいます。	2022-02-25 10:45:29
TECH	Engadget Japanese	Windows 11のタスクバー、タブレットにてデザイン変更へ	https://japanese.engadget.com/windows-11-taskbar-100049564.html	insiderpreview	2022-02-25 10:00:49
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] “魚をよく食べる遺伝子”が多い都道府県ランキング　2位「沖縄県」、1位は？	https://www.itmedia.co.jp/business/articles/2202/25/news159.html	itmedia	2022-02-25 19:37:00
IT	ITmedia 総合記事一覧	[ITmedia News] 「ロシア政府に対抗作戦を行う」──ハッカー集団Anonymousが声明　サイバー攻撃を示唆	https://www.itmedia.co.jp/news/articles/2202/25/news174.html	anonymous	2022-02-25 19:30:00
IT	ITmedia 総合記事一覧	[ITmedia Mobile] yahoo!メールに新ドメイン「ymail.ne.jp」　3文字から取得可能	https://www.itmedia.co.jp/mobile/articles/2202/25/news156.html	itmediamobileyahoo	2022-02-25 19:15:00
python	Pythonタグが付けられた新着投稿 - Qiita	事業企画1年目のpython学習5日目	https://qiita.com/Kamon/items/17cc970fbae1b81b29e8	defeatbreakfastlunchdinnercurrydessertsprint朝はを食べましたformatbreakfastprint昼はを食べましたformatlunchprint夜はを食べましたformatdinnerfordindessertsprintおやつにを食べましたformatdeatトーストパスタカレーアイスチョコカレー朝はトーストを食べました昼はパスタを食べました夜はカレーを食べましたおやつにアイスを食べましたおやつにチョコを食べましたおやつにカレーを食べましたということでした。	2022-02-25 19:24:31
python	Pythonタグが付けられた新着投稿 - Qiita	JSONとdict型の相互変換(Python)	https://qiita.com/Mijinko/items/d37d069e5a7485a72b11	withopendirmodertencodingutfasfdatajsonloadfJSONのファイル内容をdictに変換する。	2022-02-25 19:01:33
js	JavaScriptタグが付けられた新着投稿 - Qiita	【個人開発】教員向け授業計画作成サービスを作ってみた。	https://qiita.com/msya0411/items/96b6ed21999e72c8180f	【Twitter】【今回作成したサービス】今回は、以前LaravelVuejsで作成した授業計画指導案作成サービスをご紹介したいと思います。	2022-02-25 19:13:59
Docker	dockerタグが付けられた新着投稿 - Qiita	Laravelとdocker よく打つコマンド	https://qiita.com/mireihayase/items/0f760d6e6ca2a74ce7f7		2022-02-25 19:19:57
Azure	Azureタグが付けられた新着投稿 - Qiita	Application Gateway のカスタムエラーページを実装する	https://qiita.com/hiro10149084/items/865c5590e1a42e4dc51a	HTMLファイル格納用ストレージアカウントのアクセスポリシー設定が緩すぎるこちらも上述しましたが、ストレージアカウントには下記の設定が必要です。	2022-02-25 19:21:59
技術ブログ	Mercari Engineering Blog	メルカリShopsでのDesign Docs運用について	https://engineering.mercari.com/blog/entry/20220225-design-docs-by-mercari-shops/	desihellip	2022-02-25 10:00:55
技術ブログ	Developers.IO	CodePipelineを使ってSAMでシンプルなAPI Gatewayをデプロイしてみた	https://dev.classmethod.jp/articles/codepipeline-deploy-sam-api-gateway/	apigateway	2022-02-25 10:53:49
海外TECH	DEV Community	Read XKCD in the terminal with some bash magic	https://dev.to/robole/read-xkcd-in-the-terminal-with-some-bash-magic-1i4j	Read XKCD in the terminal with some bash magicXKCD is probably the most popular webcomic with Devs It only seems right that you can read it from the comfort of your terminal via a xkcd command How can we pull that off I use Kitty as my terminal of choice It is fast feature rich and is cross platform Linux and macOS The real game changer is that it is one of the few terminal emulators that uses GPU rendering and has its own graphics protocol for displaying images So out of the box Kitty can show images with a caveat why not put this capability to use TLDR behold the script usr bin env bash Save this file as xkcd URL if gt amp amp r then URL fidata curl s L URL grep href cut d gt f cut d lt f kitty kitten icat dataRun xkcd to fetch the latest comic or xkcd r for a random selection Read on if you d like to understand the finer details Displaying imagesKitty shows images via the icat kitten which is included in the default installation A kitten is a python script to extend the functionality of Kitty To display an image you can run the following command in Kitty kitty kitten icat img pngThere is a caveat that ImageMagick must be installed for icat to work I had it installed already so everything worked first time for me It supports all image types supported by ImageMagick I believe iTerm has similar functionality with its imgcat script If you want to use another terminal emulator maybe you can use a python library called Überzug to achieve the same outcome You could use one of the image viewer utilities feh and sxiv but they will always open a new terminal window AFAIK Personally I prefer to have the comic shown as an inline image and Kitty does that with the least fuss It s a no brainer for my personal preferences Scripting time You should not need to install anything else if you have a nix machine or have cygwin installed on Windows its installed with Git usually With the GNU coreutils curl grep and cut we should be able to get the latest webcomic from the XKCD homepage It would be nice to be able to read a random XKCD also Is there a way to do this from the XKCD website We are in luck because the XKCD website has a Random page where they fetch a random comic from their archive for you So we should be the able to do the same thing with the random page and home page To grab the homepage we use curl with the s flag to run in silent mode so there is no progress meter or error messages curl s We can use grep to pick out the URL of the image of the webcomic The webpage is quite short so we wont have to write anything too gnarly We just want to uniquely identify the image URL with the simplest regex regular expression possible On inspection of the HTML it looks like this snippet is the easiest to target Image URL for hotlinking embedding lt a href gt lt a gt There is an extra space after the equals sign for the href attribute oddly If we target the href attribute with the beginning of the URL we will will get this as the only result The regex href should do the trick We pipe the output of the curl command to the grep command and get the snippet we are after Next we want to get the URL on its own We can use cut to strip out the unwanted parts of this string using the angled brackets as a delimiter Using cut d gt f on the output gives us lt a if we pipe this output to cut d lt f we get the URL on its own So as a single line command we can run the following the latest webcomic kitty kitten icat curl s grep href cut d gt f cut d lt f Lets tidy the script up to make it more readable and add the ability to choose a random comic with a r flag If there is a r argument passed as the first parameter to the script we will fetch the page instead of the homepage Since this URL will redirect you to another page we need to adjust our curl command to follow this redirect We can do this by adding the L flag And thats it the rest of the logic is the same for getting the correct image from the fetched page This is our final script which we put in a file named xkcd usr bin env bashURL if gt amp amp r then URL fidata curl s L URL grep href cut d gt f cut d lt f kitty kitten icat dataNow to get a random comic we can run xkcd r Mission accomplished You got to love the power of bash scripting for this type of task Our basic functionality can be achieved with a single line command but in less than a dozen lines we have made a tidy script for reading our favourite comic on the command line	2022-02-25 10:54:26
海外TECH	DEV Community	Python Functions *args and **kwargs Structure	https://dev.to/baransel/python-functions-args-and-kwargs-structure-26f2	Python Functions args and kwargs StructureSign up to my newsletter What are args and kwargs These structures are sometimes used when we do not know the number of parameters to import or the number of parameters varies Thus we bring dynamism to our function Let s show it with an example For example let s write a function that sums the entered numbers def add number number print sum number number add It works very well so let s add another number this time add three numbers def add number number print sum number number add TypeError add takes positional arguments but were givenYes we got an error because we stated that it can take two parameters while writing the function so let s fix it def add number number number print sum number number number add This is how we fixed it This is not a correct usage because if I want to add two numbers together again I will have to change the function again The function I wrote here is just a function that adds two numbers but I don t want that I want to add when I want and when I want Then we will use args and kwargs structures Using argsdef add args print sum args add add You can now enter as many numbers as you want No matter how many numbers the function gets it will do the necessary operations Using kwargsYes we learned what args is and how to use it But what is kwargs And what is the difference between them Likewise we use kwargs in situations where we do not know how many parameters to use but kwargs is based on a key value relationship Did you remember this from somewhere because this is nothing but the dictionary data type we are talking about Let s show it with an example def printOutput kwargs print kwargs printOutput number number number number number number As you can see it returned us a dictionary data type as output Combining args and kwargsWell you have a question can I use args and kwags parameters Let s see now def printOutput args kwargs print kwargs print args printOutput number number number number number number You might also likePython FunctionsPython File OperationsPython Set and FrozensetPython dictionary and dictionary methodsPython tuple and tuple methodsSign up to my newsletter	2022-02-25 10:25:16
海外TECH	DEV Community	MTL First Beta Release	https://dev.to/zigrazor/mtl-first-beta-release-246f	MTL First Beta ReleaseWe are pleased to announce the First Beta Release of the MTL Multi Threading Library under the GPL License ZigRazor MTL Multi Thread Library MTL Multi Threading LibraryRoadmap Thread Class Thread Manager Thread Pool Task Class Ordered Task Task Flow Complete Documentation Doxygen Integration First Beta Release Test Framework CI CD Pipeline First Stable Release Thread Monitoring See the open issues for a full list of proposed features and known issues Getting StartedThis is an example of how you may give instructions on setting up your project locallyTo get a local copy up and running follow these simple example steps PrerequisitesThe following are required to get the project up and running Google TestGoogleTestgit clone Dowload the Google Test repositorycd googletest Main directory of the cloned repository mkdir p build Create a directory to hold the build output cd build Move into the build directory cmake Generate native build scripts for GoogleTest make Compilesudo make install Install in… View on GitHub ExampleThe followings are some example of use case where the library can be applied Thread ClassTo let the thread class know what to do you must create a Runnable object MyRunnable hpp include lt iostream gt include MTL h class MyRunnable public MTL MTLRunnable public MyRunnable default virtual MyRunnable default void run MTL MTLThreadInterface threadIf std cout lt lt Hello World lt lt std endl int counter while true if threadIf gt getThreadState MTL E MTLThreadState STOPPED std cout lt lt Stopped lt lt std endl std this thread sleep for std chrono milliseconds else if threadIf gt getThreadState MTL E MTLThreadState SUSPENDED std cout lt lt Suspended lt lt std endl std this thread sleep for std chrono milliseconds else if threadIf gt getThreadState MTL E MTLThreadState EXITED std cout lt lt Exited lt lt std endl break else if threadIf gt getThreadState MTL E MTLThreadState RUNNING Simulate seconds of running work if counter threadIf gt setThreadState MTL E MTLThreadState EXITED std cout lt lt Running lt lt std endl std this thread sleep for std chrono milliseconds counter void stop std cout lt lt Stop lt lt std endl void suspend std cout lt lt Pause lt lt std endl void resume std cout lt lt Resume lt lt std endl void clean exit std cout lt lt Clean Exit lt lt std endl void force exit std cout lt lt Force Exit lt lt std endl exit clean Exit Then in the main function you can create a thread object and pass it the runnable object main cpp include MyRunnable hpp int main MyRunnable myRunnable Create a runnable object MTL MTLThread thread myRunnable Create a thread object and pass it the runnable object thread run Start the Thread std this thread sleep for std chrono milliseconds Sleep for seconds thread suspend Suspend the thread std this thread sleep for std chrono milliseconds Sleep for seconds thread resume Resume the thread int counter while thread isRunning Wait seconds in the main thread if counter break std this thread sleep for std chrono seconds std cout lt lt Counter lt lt counter lt lt std endl counter return Worker Threads ClassThe Worker Thread class is a runnable with more features It contains a message queue Has to implement the function to process the messagesThis class can be used to create a runnable to pass to a Thread object that receive an input message and elaborate it A simple example of implementation of the Worker Thread Class can be the following MyWorkerThread hppclass MyWorker public MTL MTLWorkerThread public MyWorker default virtual MyWorker default virtual void processMessage MTL Message message override When the message is dequeued it is passed to this function int message casted static cast lt int gt message get Cast the message to the correct type std cout lt lt MyWorker processMessage lt lt message casted lt lt lt lt std endl Do somenthings with the message Thread Manager ClassThe Thread Manager class is a Runnable that can be used to manage threads If you want to manage a group of threads all togheter you can create a Thread Manager object and pass it to a Thread object The threads can be passed to the Thread Manager object and the Thread Manager object will manage the threads So if you have multiple tasks or multiple workers you can collect them in a thread manager and all the action performed to the thread manager start stop suspend resume etc will be performed to all the threads A Simple example of usage can be the following include MTL h include MyWorker hpp int main Three different kind of workers MyWorker myWorker MyWorker myWorker MyWorker myWorker MTL MTLThreadManager threadManager Create a thread manager object threadManager addThread std make unique lt MTL MTLThread gt myWorker Add a thread to the thread manager threadManager addThread std make unique lt MTL MTLThread gt myWorker Add a thread to the thread manager MTL MTLThread thread threadManager Create a thread object and pass it the thread manager thread run Start the thread manager that will start all the threads std this thread sleep for std chrono milliseconds Let him work for seconds thread suspend Suspend the thread manager that will suspend all the threads std this thread sleep for std chrono milliseconds Let suspended for seconds thread resume Resume the thread manager that will resume all the threads threadManager addThread std make unique lt MTL MTLThread gt myWorker Add a thread to the thread manager thread clean exit Clean Exit the thread manager that will clean exit all the threads while thread isRunning Wait for the thread manager to exit std this thread sleep for std chrono seconds std cout lt lt Counter lt lt counter lt lt std endl counter std cout lt lt Thread Manager Terminated lt lt std endl return Thread Pool ClassThe Thread Pool class is a Thread Manager that can be used to create a fixed number of workers that execute the same task When a message is enqueued to the thread pool the message is passed to a workers This kind of thread manager is useful when you have to implement a multi threaded consumer An example of usage can be the following include MTL h int main MyWorker myWorker Create a worker MTL MTLThreadPool threadPool myWorker Create a thread pool with workers MTL MTLThread thread threadPool Create a thread object and pass it the thread pool thread run Start the thread pool that will start all the workers for int i i lt i Enqueue messages std cout lt lt Inject Message lt lt i lt lt std endl MTL Message message new int i threadPool onMessage message std this thread sleep for std chrono milliseconds Let him work for seconds std cout lt lt Suspend lt lt std endl thread suspend Suspend the thread pool that will suspend all the workers for int i i lt i Enqueue messages std cout lt lt Inject Message lt lt i lt lt std endl MTL Message message new int i threadPool onMessage message std this thread sleep for std chrono milliseconds Let Suspeded for seconds std cout lt lt Resume lt lt std endl thread resume Resume the thread pool that will resume all the workers std cout lt lt Exit lt lt std endl thread clean exit Clean Exit the thread pool that will clean exit all the workers while thread isRunning Wait for the thread pool to exit std this thread sleep for std chrono seconds std cout lt lt Counter lt lt counter lt lt std endl counter std cout lt lt Thread Pool Terminated lt lt std endl return Shared Object and Shared Memory ClassesThe Shared Object class is a class that manage a shared memory object and can be used in a thread safe manner The Shared Memory class is a class that manage shared objects and can be used in a thread safe manner The two classes can be used to create a thread safe memory to share data between threads The following is a simple example of application MySharedObject hpp include MTL h class MySharedObject public MTL MTLSharedObject public MySharedObject unsigned int id MTLSharedObject id std cout lt lt MySharedObject MySharedObject lt lt std endl value MySharedObject std cout lt lt MySharedObject MySharedObject lt lt std endl int getValue return value void setValue int v value v private int value The value of the shared object MyRunnable hpp include MTL h class MyRunnable public MTL MTLRunnable public MyRunnable MTL MTLSharedMemory sharedMemory m sharedMemory sharedMemory virtual MyRunnable default void run MTL MTLThreadInterface threadIf std cout lt lt Hello World lt lt std endl int counter while true if threadIf gt getThreadState MTL E MTLThreadState STOPPED std cout lt lt Stopped Thread Id lt lt std this thread get id lt lt std endl std this thread sleep for std chrono milliseconds else if threadIf gt getThreadState MTL E MTLThreadState SUSPENDED std cout lt lt Suspended Thread Id lt lt std this thread get id lt lt std endl std this thread sleep for std chrono milliseconds else if threadIf gt getThreadState MTL E MTLThreadState EXITED std cout lt lt Exited Thread Id lt lt std this thread get id lt lt std endl break else if threadIf gt getThreadState MTL E MTLThreadState RUNNING when running this runnable increment the shared memory value by MySharedObject amp myObj dynamic cast lt MySharedObject amp gt m sharedMemory gt getSharedObjectById std cout lt lt Thread Id lt lt std this thread get id lt lt starting Value lt lt myObj getValue lt lt end Value lt lt myObj getValue lt lt std endl myObj setValue myObj getValue m sharedMemory gt releaseSharedObject myObj std this thread sleep for std chrono milliseconds counter void stop std cout lt lt Stopping lt lt std endl void suspend std cout lt lt Suspending lt lt std endl void resume std cout lt lt Resuming lt lt std endl void clean exit std cout lt lt Exiting lt lt std endl void force exit std cout lt lt Force Exiting lt lt std endl private MTL MTLSharedMemory m sharedMemory main cpp include MTL h include MySharedObject hpp include MyRunnable hpp int main This example demostrate how the shared memory and shared object classes can be used to share data between threads Without alter the atomicity of the execution over the memory objects std unique ptr lt MySharedObject gt myObj new MySharedObject Create a shared object MTL MTLSharedMemory sharedMemory Create a shared memory sharedMemory addSharedObject std move myObj Add the shared object to the shared memory MyRunnable myRunnable amp sharedMemory Create a runnable MyRunnable myRunnable amp sharedMemory Create another runnable MTL MTLThread thread myRunnable Create a thread from the runnable MTL MTLThread thread myRunnable Create another thread from the runnable thread run Run the thread thread run Run the thread std this thread sleep for std chrono milliseconds Let the threads run for second std cout lt lt Suspend Thread lt lt std endl thread suspend Suspend the thread std this thread sleep for std chrono milliseconds Let the thread runs for second std cout lt lt Resume Thread lt lt std endl thread resume Resume the thread std this thread sleep for std chrono milliseconds Let the threads run for second std cout lt lt Exit the Threads lt lt std endl thread clean exit Exit the thread thread clean exit Exit the thread thread join Wait for the thread to finish thread join Wait for the thread to finish std cout lt lt Threads Joined lt lt std endl return Task ClassThe task class is a wrapper of C task class It needs a runnable task to be executed A simple example can be the following one MyRunnableTask hpp include lt iostream gt include MTL h class MyRunnableTask public MTL MTLRunnableTask public MyRunnableTask default virtual MyRunnableTask default std shared ptr lt void gt run MTL MTLTaskInterface interface nullptr std cout lt lt Hello World lt lt std endl std cout lt lt Simulating Working for seconds lt lt std endl for int i i lt i std cout lt lt lt lt std flush std this thread sleep for std chrono seconds std cout lt lt std endl std cout lt lt This is a Task that return lt lt std endl int i std shared ptr lt void gt result new int i return result main cpp include MyRunnableTask hpp int main MyRunnableTask myRunnableTask Create a runnable task MTL MTLTask task myRunnableTask Create a task from the runnable task task run Run the task std shared ptr lt void gt result task getResult Get the result of the task std cout lt lt Result lt lt static cast lt int gt result get lt lt std endl Print the result return Ordered Task and Task Flow ClassesThe Ordered Task class is derived from Task class and has a list of predecessors and a list of successors The Task Flow class is a class that allow to execute ordered task in a consistent manner and return the final result A simple example can be the following one DerivedTasks hpp include lt iostream gt include MTL h Return class VarTask public MTL MTLRunnableTask public VarTask default virtual VarTask default std shared ptr lt void gt run MTL MTLTaskInterface interface nullptr MTL MTLOrderedTaskInterface orderedTaskIf dynamic cast lt MTL MTLOrderedTaskInterface gt interface std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Start Task lt lt std endl lt lt std flush std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Simulating Working for seconds lt lt std endl lt lt std flush for int i i lt i std cout lt lt lt lt std flush std this thread sleep for std chrono seconds std cout lt lt std endl auto previousResult orderedTaskIf gt getPredecessorsResults std shared ptr lt void gt result new int std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Result lt lt int result get lt lt std endl lt lt std flush return result Sum predecessorsclass SumTask public MTL MTLRunnableTask public SumTask default virtual SumTask default std shared ptr lt void gt run MTL MTLTaskInterface interface nullptr MTL MTLOrderedTaskInterface orderedTaskIf dynamic cast lt MTL MTLOrderedTaskInterface gt interface std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Start Task lt lt std endl lt lt std flush std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Simulating Working for seconds lt lt std endl lt lt std flush for int i i lt i std cout lt lt lt lt std flush std this thread sleep for std chrono seconds std cout lt lt std endl auto predecessorsResults orderedTaskIf gt getPredecessorsResults std shared ptr lt void gt result new int if predecessorsResults empty std shared ptr lt void gt result new int return result else auto it predecessorsResults begin std shared ptr lt void gt result int it gt second get it for it it predecessorsResults end it int previousResult int it gt second get int currentResult int result get currentResult currentResult previousResult std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Result lt lt int result get lt lt std endl lt lt std flush return result Multiply predecessorsclass MulTask public MTL MTLRunnableTask public MulTask default virtual MulTask default std shared ptr lt void gt run MTL MTLTaskInterface interface nullptr MTL MTLOrderedTaskInterface orderedTaskIf dynamic cast lt MTL MTLOrderedTaskInterface gt interface std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Start Task lt lt std endl lt lt std flush std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Simulating Working for seconds lt lt std endl lt lt std flush for int i i lt i std cout lt lt lt lt std flush std this thread sleep for std chrono seconds std cout lt lt std endl lt lt std flush auto predecessorsResults orderedTaskIf gt getPredecessorsResults std shared ptr lt void gt result new int if predecessorsResults empty std shared ptr lt void gt result new int return result else auto it predecessorsResults begin std shared ptr lt void gt result int it gt second get it for it it predecessorsResults end it int previousResult int it gt second get int currentResult int result get currentResult currentResult previousResult std cout lt lt orderedTaskIf gt getTaskName lt lt lt lt Result lt lt int result get lt lt std endl lt lt std flush return result main cpp include DerivedTasks hpp This Example simulate the execution of the following expression a b c d e where a b c d e are value int main std cout lt lt Running Example for MTL Version lt lt MTL VERSION MAJOR lt lt lt lt MTL VERSION MINOR lt lt lt lt MTL VERSION PATCH lt lt std endl VarTask varTask Task that return SumTask sumTask Task that return the sum of the predecessors MulTask mulTask Task that return the multiplication of the predecessors auto taskA std make shared lt MTL MTLOrderedTask gt a varTask Task that return auto taskB std make shared lt MTL MTLOrderedTask gt b varTask Task that return auto taskC std make shared lt MTL MTLOrderedTask gt c varTask Task that return auto taskD std make shared lt MTL MTLOrderedTask gt d varTask Task that return auto taskE std make shared lt MTL MTLOrderedTask gt e varTask Task that return auto taskF std make shared lt MTL MTLOrderedTask gt f sumTask Task that return the sum of the predecessors auto taskG std make shared lt MTL MTLOrderedTask gt g sumTask Task that return the sum of the predecessors auto taskH std make shared lt MTL MTLOrderedTask gt h sumTask Task that return the sum of the predecessors auto taskI std make shared lt MTL MTLOrderedTask gt i mulTask Task that return the multiplication of the predecessors MTL MTLTaskFlow taskFlow Task Flow taskFlow precede taskA taskF Task A precede Task F taskFlow precede taskB taskF Task B precede Task F taskFlow precede taskC taskG Task C precede Task G taskFlow precede taskF taskG Task F precede Task G taskFlow precede taskD taskH Task D precede Task H taskFlow precede taskE taskH Task E precede Task H taskFlow precede taskG taskI Task G precede Task I taskFlow precede taskH taskI Task H precede Task I taskFlow run Run the task flow std shared ptr lt void gt result taskFlow getResult Get the result of the task flow std cout lt lt Result lt lt static cast lt int gt result get lt lt std endl Print the result return For more examples please refer to the Example Directory Compilation and Usage PrerequisitesThe following are required to get the project up and running Google TestGoogleTestgit clone Dowload the Google Test repositorycd googletest Main directory of the cloned repository mkdir p build Create a directory to hold the build output cd build Move into the build directory cmake Generate native build scripts for GoogleTest make Compilesudo make install Install in usr local by default Installationgit clone Dowload the MTL repositorycd MTL Main directory of the cloned repository mkdir p build Create a directory to hold the build output cd build Move into the build directory cmake Generate native build scripts for MTL make Compilesudo make install Install in usr local by default UsageThe only things you have to do to get library in you project are to Include the header file MTL h in your project Link the library MTL so to your project How to contributeContributions are what make the open source community such an amazing place to learn inspire and create Any contributions you make are greatly appreciated If you have a suggestion that would make this better please fork the repo and create a pull request You can also simply open an issue with the tag enhancement Don t forget to give the project a star Thanks again Before these steps please read the Contributing Guidelines and the Code of ConductFork the ProjectCreate your Feature Branch git checkout b feature AmazingFeature Commit your Changes git commit m Add some AmazingFeature Push to the Branch git push origin feature AmazingFeature Open a Pull Request ContactsZigRazor zigrazor gmail comProject Link	2022-02-25 10:20:37
海外TECH	DEV Community	Build and deploy a real-time react chat app in under 10 minutes	https://dev.to/digitallyinduced/build-and-deploy-a-real-time-react-chat-app-in-under-10-minutes-2gie	Build and deploy a real time react chat app in under minutesIn this article you will learn how to use IHP Backend s react API to build a chat application like WhatsApp or Signal deploying it to production along the way all within minutes IHP Backend is a new Backend as a Service offering by digitally induced React apps built using its toolkit are realtime by default meaning it s easier to build an app that reacts to data updates everywhere all the time than it is to keep data out of date PreparationI assume a basic understanding of relational databases and React including hooks throughout this article I also assume you have a GitHub account and know how to commit and push using git You should also have a recent version of node and npm installed Minute Sign up for IHP BackendGo to choosing Continue with GitHub After going through all the required steps you will be greeted by your project overview Minute Create the projectClick on the New Project button and enter a name for your project for example Realtime Chat and click on Create Project when you re happy with it You ll be greeted by the Onboarding Feel free to use the Onboarding later to build a to do app but we will continue differently Click on Frontend in the left navigation bar We ll use this tab to generate a boilerplate frontend Click on New Vercel Project Vercel is a platform to deploy frontend frameworks and static sites We ll use it to get our frontend deployed quickly and easily The following screen will greet you Choose the TypeScript React Starter template from among the choices but feel free to take a quick look at the other options Don t be surprised that a new tab will open for Vercel Choose GitHub as a provider also on the following screen Enter your project s name it doesn t have to match exactly as a repository name Finally click on Create to actually create your project It ll take a short while after which you will be prompted to configure your project By clicking on the Learn More link a new tab will open showing you the value to enter into the input box This will be the URL at which the backend of the chat app is accessible Simply click on the displayed link to copy it and enter it on Vercel Then click the Deploy button It will take a few seconds after which your project is already online and you will be redirected back to IHP Backend Let s check that everything is working so far by clicking the Frontend button in the left sidebar It should redirect you to the login for your new chat app Create a new account here then continue below Minute Modifying the schemaWe could already create users because every new IHP Backend project automatically comes with authentication built in You can see some of that implementation by checking out the users table in the schema designer To do that click on Schema in the left navigation bar on IHP Backend You should see a screen like this As you can see a users table is already set up Users by default have a few columns that are relevant for IHP Backend that we don t need to care about For us only the email is interesting since we can use it to show to users later to choose with whom to chat At the bottom you can also see a section titled Policies IHP Backend uses PostgreSQL under the hood Policies are a way to allow users to access and modify the rows of tables only if some conditions are met By default you can see that users can read if id ihp user id and write if false That means users can only see their own user record and no user can edit any record For simplicity we ll allow all users to view the records of all users to have an easier time listing all the options to who we can send messages To do so right click on the policy and select Edit Policy A modal will open allowing you to edit the policy Change the content of the Visible if box to true This is a terrible idea for an actual production app We re simply doing this for simplicity and to get something running asap A little popover will appear after you save When making changes to the schema those changes do not immediately apply to the underlying database Instead IHP Backend uses Migrations to allow you to customize how the data in the schema should be converted For now we ll just ignore the popover and make a few more changes to the schema If we want to allow users to chat with one another we need to save the messages they send To do that we ll create a new table Click on the little next to the Tables header on the left and a modal will open prompting you for a name Let s call this table messages Click on Create Table You can notice a few things now First there s a little icon next to the messages table in the list on the left This icon tells us that we haven t created any policies for this table yet which will make it inaccessible to our frontend for security reasons We ll fix that in a bit You should also notice three large buttons in the list of columns Right now our messages only have an id but they should get some more columns to save who sent them who they were sent to when they were sent and what content they contain IHP Backend suggests a few columns that are commonly used Two of those we want created at and user id We ll use created at to sort the messages later and user id is a good choice for saving who sent the message If you click on those two suggestions you will notice a few things happen First the columns are added to the table as expected Additionally at the bottom you will see a policy has been created That s because IHP Backend assumes that once you link something to a user only that user should have access to it That s a very reasonable default and dangerous to forget We will only have to make a slight adjustment in our case in a bit Second below the policies you can see a few indices created IHP Backend assumes that queries based on the user id and created at columns are common so it creates indices for those too I suggest keeping them for our project but if IHP Backend generates something you don t need for your project you can delete it without issue The goal is to generate the correct thing for of cases and allow you to adjust everything for the other of cases We still require one more column a recipient id so we know to whom a message was sent Click on the little icon in the top right to create that column A modal will open allowing you to configure a new column for the table Let s set the name to recipient id You ll notice IHP Backend notices that a UUID is expected here and selects the correct type for the column for us We ll only have to change the default value There s no sensible default since we always want to set the recipient id ourselves Simply change the dropdown s value from uuid generate v to no default You can now click on Create Column We now have to add a foreign key constraint to that column as IHP Backend did not recognize that recipient id should reference the users table To do so right click the newly created column and click on Add Foreign Key Constraint A modal should open The defaults are precisely like we want so we can click on Add Constraint You can see that it worked because it says FOREIGN KEY users on the right side of the column s details Now that we know when messages are created and who sent them to whom we can add the last required column which will contain the message s contents content Click on the little in the top right again calling the new column content keeping the default type of Text and no default After clicking on Create Column your messages table should look like this There s only one more step missing before migrating the database to our new schema We have to edit the messages policy Right now users are only able to read messages they sent themselves but they also should be able to read messages they receive Therefore right click the Users can manage their messages policy at the bottom choosing Edit Policy in the context menu Change the Visible if part of the policy from user id ihp user id to user id ihp user id OR recipient id ihp user id which will allow users to read all rows where either the user id or the recipient id is equal to their user record s id After clicking on Update Policy your table should look like this We can finally apply these changes to the database by clicking on the Migrate DB button at the bottom of the screen IHP Backend will automatically generate a new migration Migrations are nothing more than the SQL statements required to get the current database schema to match the schema with our edits If we had production data already we might have to be careful in converting from one state of the database to the next to correctly convert the data which would mean manually adjusting the generated migration Since we don t have any important data yet though only the user we created when signing up to our app we can safely save and run the generated migration by clicking on the Run Migration button After clicking the button the migration will run which should take at most a few seconds after which you will see a list of past migrations currently only containing the one we just created A little green arrow at the right indicates that IHP Backend executed the migration successfully By clicking on Schema Designer in the top navigation you can see that the Unmigrated Changes message is now gone indicating that the database matches what we see in the Schema Designer Minute Cloning the Frontend locallyNow that we ve finished our backend we can take care of our frontend The first step will be to clone our generated frontend repository so that we can work with it locally git clone cd REPOSITORYNAMEWhen you open the project with your favorite code editor for example VSCode you will see the following folder structure We will primarily be working within the app tsx file containing all the react code If you were to create a production ready app you would of course set up the project to your liking but for simplicity s sake we will stay in a single file for this article Before we go and write code we ll want to get a development server running and connected to our backend to verify that everything works as expected before deploying it We must first tell the frontend where it can access our backend by setting the BACKEND URL environment variable The easiest way to do that is to create a file called env in the project directory and add a line like this BACKEND URL https REPLACE ME You can get the value for the right of the equals sign from IHP Backend itself it s the same value we entered when we created the project on Vercel You can find it by clicking on Docs in the left navigation You will see a section in the right sidebar as in the screenshot below Simply click on the URL to copy it So in my case the final env file would look like this Next let s test that everything s working as expected by first installing all dependencies and then starting the development server npm installnpm run devIf you now open localhost you will be redirected to a login form where you can log in using the details you used when creating an account on your own site earlier or you can create a new user of course Once logged in you should see a mostly empty screen apart from a slightly darkened bar at the top with your email If you click on your email you get the option to log out again The last thing we ll do before we implement our frontend is to install the project specific types so we can use our editor s autocompletion and don t get any type errors in our editor Open the Schema Designer on IHP Backend and click on Type Definitions in the top navigation By clicking on the npm install command for TypeScript and running that locally in our project s directory we should be all set cloneadd BACKEND URL env variableinstall types Minute Listing users to chat withA chat app without the option for users to chat with others is pretty useless To chat with someone else we first need to choose with whom to chat For simplicity we ll simply list all users that signed up for our app so everyone can send messages to everyone else Open the app tsx file There s a bit of code in there already giving us a basic structure Feel free to take a look to understand what s going on Most imports are added only for convenience they aren t actually used yet For listing the users let s create a component called Users to list all users we can chat with To do so create a new function in app tsx called Users I ll add the function after the AppNavbar component For now I ll simply return an empty div from it function Users return lt div gt lt div gt Let s render that component by adding it below the lt AppNavbar gt line in the App component between lines and The App component should now look like this function App With useQuery you can access your database const todos useQuery query todos orderBy createdAt return lt IHPBackend requireLogin gt lt div className container gt lt AppNavbar gt lt Users gt lt div gt lt IHPBackend gt Let s get all users from the backend by modifying the Users component Inside it add a new variable called users setting its value to the result of the useQuery hook from IHP Backend const users useQuery The useQuery hook allows us to fetch information from the backend which will automatically refresh in realtime whenever the data on the backend changes Your editor might give you a type error right now as useQuery expects a query as an argument so it knows what to fetch Let s pass it a simple query to fetch all users const users useQuery query users You might have noticed that you got autocompletion for every part of this which is one benefit of using typescript and installing the types provided by IHP Backend The users variable now contains the list of all users or null if the fetch isn t completed Let s deal with that second case first by adding a simple if statement to return a Loading message to display if users null return lt div gt Loading lt div gt Otherwise we ll render the users as a list like this return lt div gt users map user gt lt div key user id gt lt button className btn btn link gt user email lt button gt lt div gt lt div gt Currently the Users component looks like this function Users const users useQuery query users if users null return lt div gt Loading lt div gt return lt div gt users map user gt lt div key user id gt lt button className btn btn link gt user email lt button gt lt div gt lt div gt If you open the local app in your browser you might see a short Loading message appear quickly replaced by an entry for every user you created so far which is probably just yourself Before we continue let s create a few users to chat with so it s not quite as evident that we re only talking to ourselves Log out and create new user accounts so the list is a bit more populated You might be redirected to the deployed version of your app after creating accounts If that happens simply go back to localhost http localhost to create the next account or log in there With a few more users available to chat we can now hide ourselves from the list by adding a simple filter to the query Let s change the line that defines the users variable to the following const users useQuery query users whereNot id getCurrentUserId If you check the list now the user you logged in as should not appear in the list anymore We modified the query users part using whereNot id getCurrentUserId getCurrentUserId is a function imported from ihp backend which will return the current user id as long as you are logged in whereNot allows you to filter the data in the database by only including rows where the column passed as a first argument id does not equal the second argument So effectively we query for all users where the id does not match the currently logged in user s id resulting in all users except the one we logged in as Now that we have a list of users to chat with let s quickly allow selecting them We ll add a simple state variable to the App component to keep track of the user we ve currently selected add this import so we can make TypeScript happyimport type User from ihp backend add this to the App componentconst selectedChat setSelectedChat useState lt User null gt null Let s add a onUserSelect prop to the Users component which is called by an onClick handler on the button tag function Users onUserSelect onUserSelect user User gt any lt button className btn btn link onClick gt onUserSelect user gt Now we can pass the setSelectedProp function to the Users component with that prop replace this line in the App component lt Users gt with this one lt Users onUserSelect setSelectedChat gt Now the App component keeps track of the user we re chatting with Minute Allow sending messages to usersNext let s create the Chat component which we ll eventually use to chat with another user for now we ll just use it to display the currently selected user Create a Chat function component that accepts a user prop of type User and renders a simple div containing the user s email function Chat user user User return lt div gt user email lt div gt Let s render that component from our App component by adding it below the Users component if the selectedChat isn t null and pass the selectedChat to it function App const selectedChat setSelectedChat useState lt User null gt null return lt IHPBackend requireLogin gt lt div className container gt lt AppNavbar gt lt Users onUserSelect setSelectedChat gt selectedChat null null lt Chat user selectedChat gt lt div gt lt IHPBackend gt When clicking on the different users the email below the list should now change in the browser Let s change the markup a bit to render the Chat component on the right side next to the Users function App const selectedChat setSelectedChat useState lt User null gt null return lt IHPBackend requireLogin gt lt div className container gt lt AppNavbar gt lt div className row gt lt div className col gt lt Users onUserSelect setSelectedChat gt lt div gt lt div className col gt selectedChat null null lt Chat user selectedChat gt lt div gt lt div gt lt div gt lt IHPBackend gt Things should now look something like this Now that we have a Chat component with access to the user we ve selected we can finally create the necessary code to send messages to that user Let s add a form element inside the Chat component with a simple input and a submit button which we can use to send messages function Chat user user User return lt div gt user email lt form className input group mt gt lt input type text className form control placeholder Type a message aria describedby send button autoFocus gt lt button type submit className btn btn primary gt Send lt button gt lt form gt lt div gt I have added a bit of simple markup to make it look prettier To make this work we ll need to handle the submit event of the form we can do that by creating a handleSend function within the Chat component that we pass to the onSubmit attribute of the form element add this before the return in Chat function handleSend event FormEvent lt HTMLFormElement gt event preventDefault const input event currentTarget elements namedItem message as HTMLInputElement this is where the magic happens createRecord messages recipientId user id content input value input value The important call here is the one to createRecord IHP Backend provides this function The first argument tells IHP Backend to create a new record in the messages table and the second argument contains all the required fields we need to set for the record to be complete it ll use the default values if we don t override them Since IHP Backend uses the currently logged in user s id as user id by default as defined in the schema and generates a new id for the message automatically we only need to set the recipient id to the id of the user we ve selected to chat with and the content to the input s value Minute Display sent messagesThere s only one problem once we send the message there s no way to read it So the next step is to display all messages sent into the current chat To do so we ll write another query using useQuery inside the Chat component Let s start simple and get all messages the user has access to const messages useQuery query messages We can display this list of messages by adding these lines above the form tag and below the user email line messages map message gt lt div key message id className message message userId getCurrentUserId from me to me gt lt div className message content gt message content lt div gt lt div gt All we re doing here is mapping over the messages displaying each message s content inside two divs We also assign CSS classes based on whether the current user sent the message or received it by comparing the message s userId to the current user s id accessed with getCurrentUserId For the CSS classes to do anything add the following styles to public app css message from me text align right padding left rem message to me padding right rem message message content border radius px margin top rem padding rem display inline block text align left message to me message content background color lightgray message from me message content background color lightblue right I won t go over this in detail it just makes things look a bit better Feel free to take a closer look if you want though After changing the CSS you might have to reload the app in the browser to see the effects Currently we display all messages in every chat and no particular order Since that doesn t make sense let s modify the query we use to fetch the messages only to fetch those messages sent to us from the user we have selected to chat with and those we sent to them After query messages we can add a where condition as we did earlier filtering the messages we sent const messages useQuery query messages where userId getCurrentUserId That still doesn t limit the messages to those sent to the selected person though so we ll add another where condition based on the recipient const messages useQuery query messages where userId getCurrentUserId where recipientId user id Multiple where conditions like this will be combined using AND Now we have all of the messages we sent but we re now missing the messages we received To fix that we can add a set of conditions using or const messages useQuery query messages where userId getCurrentUserId where recipientId user id or where userId user id where recipientId getCurrentUserId or takes a list of conditions just as you can add them to query messages You might have to add an import for where to the import list of ihp backend at the top of the file or uses all previous conditions for the left side of the resulting OR condition If you want a bit more clarity you can wrap the initial conditions with a single call to where const messages useQuery query messages where where userId getCurrentUserId where recipientId user id or where userId user id where recipientId getCurrentUserId I personally don t think that s necessary though If we check the result in the browser messages will now only show in the correct chat However even if the order of messages might look correct we have done nothing to ensure this will stay consistent To always ensure that messages are displayed in the correct order we can add a simple orderBy createdAt to the query const messages useQuery query messages where where userId getCurrentUserId where recipientId user id or where userId user id where recipientId getCurrentUserId orderBy createdAt And finally the correct messages show in the proper order Minute RealtimeWe haven t done anything to make our app realtime yet But the useQuery hook is realtime by default meaning we don t have to do anything IHP Backend will push new data to each client who requires it over a WebSocket connection You can quickly try it out by opening a new private window in which you sign in as another user sending messages between clients the messages will show up in each browser without requiring a reload of the page I guess we can use this time for doing something else then Minute b Commit and push deploy Now that we ve finished the frontend let s deploy it to production Commit all changes and push them to your repository git add app tsx public app css package json package lock jsongit commit m implement realtime chat git pushVercel will notice a change on the main branch of our repository and deploy the changes automatically Enjoy your new app and possibly spare time Moving onFrom here you can continue playing around with IHP Backend Maybe you want to allow users to set a different display name instead of displaying their email Maybe you want users to request a chat with others so they can t just send messages to anyone willy nilly Perhaps you want to implement group chat functionality If you don t feel comfortable trying things out alone you might also want to follow the normal Onboarding process It ll lead you through creating another app similar to this article but possibly give you some new information not covered here or covered differently What will you build with IHP Backend Tell us in the comments	2022-02-25 10:11:07
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