{"id":87208,"date":"2020-07-05T13:42:19","date_gmt":"2020-07-05T11:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/sentry-udalennyj-monitoring-bagov-v-frontend-prilozheniyah-react"},"modified":"2020-07-05T13:42:19","modified_gmt":"2020-07-05T11:42:19","slug":"sentry-udalennyj-monitoring-bagov-v-frontend-prilozheniyah-react","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/administrirovanie\/sentry-udalennyj-monitoring-bagov-v-frontend-prilozheniyah-react","title":{"rendered":"Sentry remote bug monitoring in React frontend applications","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>We are exploring the use of Sentry with React.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry remote bug monitoring in React frontend applications\" src=\"\/wp-content\/uploads\/2020\/07\/6ea51ae73accae0c36e0130b830c1ca2.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>This article is part of a series that starts with Sentry error reporting example: <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/508686\/\">Part 1<\/a><\/noindex>. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p><strong>Implementing React<\/strong> <\/p>\n<p><\/p>\n<p>First, we need to add a new Sentry project for this application from the Sentry website. In this case, we choose React.<\/p>\n<p><\/p>\n<p>We will again implement our two buttons, Hello and Error, in a React application. We start by creating our starter application:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">npx create-react-app react-app<\/code><\/pre>\n<p><\/p>\n<p>Then we import the Sentry package:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">yarn add @sentry\/browser<\/code><\/pre>\n<p><\/p>\n<p>and initialize it:<\/p>\n<p><\/p>\n<p>react-app \/ src \/ index.js<\/p>\n<p><\/p>\n<pre><code class=\"javascript\">...\nimport * as Sentry from '@sentry\/browser';\n\nconst RELEASE = '0.1.0';\nif (process.env.NODE_ENV === 'production') {\n  Sentry.init({\n    dsn: 'https:\/\/303c04eac89844b5bfc908ceffc6757c@sentry.io\/1289887',\n    release: RELEASE,\n  });\n}\n...<\/code><\/pre>\n<p><\/p>\n<p>Observations:<\/p>\n<p><\/p>\n<ul>\n<li>During development, we have other mechanisms for monitoring issues, such as the console, so we enable Sentry only for production builds.<\/li>\n<\/ul>\n<p><\/p>\n<p>Next, we will implement our Hello and Error buttons and add them to the application:<\/p>\n<p><\/p>\n<p><em>react-app \/ src \/ Hello.js<\/em><\/p>\n<p><\/p>\n<pre><code class=\"javascript\">import React, { Component } from &#039;react&#039;;\nimport * as Sentry from &#039;@sentry\/browser&#039;;\n\nexport default class Hello extends Component {\n  state = {\n    text: &#039;&#039;,\n  };\n  render() {\n    const { text } = this.state;\n    return (\n      &lt;div&gt;\n        &lt;button\n          onclick=&quot;{this.handleClick}&quot;\n        &gt;\n          Hello\n        &lt;\/button&gt;\n        &lt;div&gt;{text}&lt;\/div&gt;\n      &lt;\/div&gt;\n    )\n  }\n\n  handleClick = () =&amp;gt; {\n    this.setState({\n      text: &#039;Hello World&#039;,\n    });\n    try {\n      throw new Error(&#039;Caught&#039;);\n    } catch (err) {\n      if (process.env.NODE_ENV !== &#039;production&#039;) {\n        return;\n      }\n      Sentry.captureException(err);\n    }\n  }\n}<\/code><\/pre>\n<p><\/p>\n<p><em>react-app \/ src \/ MyError.js<\/em><\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">import React, { Component } from &#039;react&#039;;\n\nexport default class MyError extends Component {\n  render() {\n    return (\n      &lt;div&gt;\n        &lt;button\n          onclick=&quot;{this.handleClick}&quot;\n        &gt;\n          Error\n        &lt;\/button&gt;\n      &lt;\/div&gt;\n    )\n  }\n\n  handleClick = () =&amp;gt; {\n    throw new Error(&#039;Uncaught&#039;);\n  }\n}<\/code><\/pre>\n<p><\/p>\n<p><em>react-app \/ src \/ App.js<\/em><\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">...import Hello from &#039;.\/Hello&#039;;\nimport MyError from &#039;.\/MyError&#039;;\n\nclass App extends Component {\n  render() {\n    return (\n      &lt;div classname=&quot;App&quot;&gt;\n        ...\n        &lt;hello \/&gt;\n        &lt;myerror \/&gt;\n      &lt;\/div&gt;\n    );\n  }\n}\n\nexport default App;<\/code><\/pre>\n<p><\/p>\n<p><strong>Problem (Source Maps)<\/strong><\/p>\n<p><\/p>\n<p>We can test Sentry with a production build by entering:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">yarn build<\/code><\/pre>\n<p><\/p>\n<p>and from the build folder enter:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">npx http-server -c-1<\/code><\/pre>\n<p><\/p>\n<p>The problem we will immediately encounter is that Sentry error logs refer to line numbers in the minified package; not very helpful.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry remote bug monitoring in React frontend applications\" src=\"\/wp-content\/uploads\/2020\/07\/e5b320f731249bad65a82e33c4e09b43.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>The Sentry service explains this by pulling source maps for the minified package after receiving the error. In this case, we run from localhost (unavailable to the Sentry service).<\/p>\n<p><\/p>\n<p><strong>Solutions (Source Maps)<\/strong><\/p>\n<p><\/p>\n<p>The solution to this problem comes down to running the application from a public web server. One straightforward way to do this is to use the GitHub Pages service (free). The steps to use it are usually as follows:<\/p>\n<p><\/p>\n<ol>\n<li>\n<p>Copy the contents of the folder <em>build<\/em> in the folder <em>docs<\/em> to the root directory of the repository.<\/p>\n<p>\n<\/li>\n<li>\n<p>Enable <em>GitHub Pages<\/em> in the repository (from GitHub) to use the docs folder in <em>master<\/em> the branch<\/p>\n<p>\n<\/li>\n<li>\n<p>Push changes to GitHub<\/p>\n<p>\n<\/li>\n<\/ol>\n<p><\/p>\n<p><strong>Note<\/strong>: after I realized that I needed to use <em>create-react-app<\/em> homepage function to serve the application. This amounted to adding the following to package.json:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">\"homepage\": \"https:\/\/larkintuckerllc.github.io\/hello-sentry\/\"<\/code><\/pre>\n<p><\/p>\n<p>The final version of the deployed application is available at:<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/larkintuckerllc.github.io\/hello-sentry\/\">https:\/\/larkintuckerllc.github.io\/hello-sentry\/<\/a><\/noindex><\/p>\n<p><\/p>\n<p><strong>Illustration of Caught Errors<\/strong><\/p>\n<p><\/p>\n<p>Let's go through pressing the Hello button.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry remote bug monitoring in React frontend applications\" src=\"\/wp-content\/uploads\/2020\/07\/1dbe7845b2e3d04933344d3d18dac01f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>With the error showing up as follows:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry remote bug monitoring in React frontend applications\" src=\"\/wp-content\/uploads\/2020\/07\/621f0f12eb77b7dd413d168c35c141d4.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Observations:<\/p>\n<p><\/p>\n<ul>\n<li>This error report cannot be clearer. <strong>BRAVO<\/strong>.<\/li>\n<\/ul>\n<p><\/p>\n<p><strong>Illustration of Uncaught Errors<\/strong><\/p>\n<p><\/p>\n<p>Similarly, let's go through pressing the button. <em>Error<\/em>.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry remote bug monitoring in React frontend applications\" src=\"\/wp-content\/uploads\/2020\/07\/65c07bc6db9f6b577ecb79dfd3336b38.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>With the error showing up as follows:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry remote bug monitoring in React frontend applications\" src=\"\/wp-content\/uploads\/2020\/07\/f4d668075885bb66ce0158588bff038c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><strong>Best Handling of Uncaught Errors (Rendering)<\/strong><\/p>\n<p><\/p>\n<blockquote><p>Introduction to Error Boundaries<\/p>\n<p>A JavaScript error in the user interface should not disrupt the entire application. To address this for React users, React 16 introduces the new concept of \"error boundaries.\"<\/p>\n<p>Error boundaries are React components that catch JavaScript errors anywhere in their child component tree, log those errors, and display a fallback UI instead of the crashed component tree. They catch errors during rendering, in lifecycle methods, and in constructors of the components below them.<\/p>\n<p>\u2026<\/p>\n<p>New Behavior for Uncaught Errors<\/p>\n<p>This change is significant. From React 16 onwards, errors that aren't caught by any error boundary will unmount the entire React component tree.<\/p>\n<p>\u2014 <em>Dan Abramov \u2014<\/em> <noindex><a rel=\"nofollow\" href=\"https:\/\/reactjs.org\/blog\/2017\/07\/26\/error-handling-in-react-16.html\"><em>Error Handling in React 16<\/em><\/a><\/noindex><\/p><\/blockquote>\n<p>An important clarification that took me some time to understand is that <strong>the aforementioned behavior only works for errors generated in render methods (or more likely, any of the lifecycle methods)<\/strong>. For example, using error boundaries would be of no help with our button <em>Error<\/em>; that error occurred in the click handler.<\/p>\n<p><\/p>\n<p>Let\u2019s create an example rendering error and then use error boundaries for a more graceful error handling.<\/p>\n<p><\/p>\n<p><em>react-app \/ src \/ MyRenderError<\/em><\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">import React, { Component } from &#039;react&#039;;\n\nexport default class MyRenderError extends Component {\n  state = {\n    flag: false,\n  };\n  render() {\n    const { flag } = this.state;\n    return (\n      &lt;div&gt;\n        &lt;button\n          onclick=&quot;{this.handleClick}&quot;\n        &gt;\n          Render Error\n        &lt;\/button&gt;\n        { flag &amp;amp;&amp;amp; &lt;div&gt;{flag.busted.bogus}&lt;\/div&gt; }\n      &lt;\/div&gt;\n    )\n  }\n\n  handleClick = () =&amp;gt; {\n    this.setState({\n      flag: true,\n    });\n  }\n}<\/code><\/pre>\n<p><\/p>\n<p>Observation:<\/p>\n<p><\/p>\n<ul>\n<li>\n<p>When the button is clicked, <em>React<\/em> Starting with Chrome 77, information about the use of EV certificates will only appear in the dropdown menu shown when clicking on the secure connection icon. In 2018, a similar decision was made by Apple for the Safari browser, implemented in releases of iOS 12 and macOS 10.14. It\u2019s worth noting that EV certificates confirm the stated identification parameters and require the certificate authority to verify domain ownership documents and physical presence of the resource owner. <em>flag.busted.bogus<\/em>, which generates an error<\/p>\n<p>\n<\/li>\n<li>\n<p>Without an error boundary, the entire component tree will unmount.<\/p>\n<p>\n<\/li>\n<\/ul>\n<p><\/p>\n<p>Then we write our error boundary code (utilizes the new lifecycle method <em>componentDidCatch<\/em>); this is essentially the example provided in Dan Abramov's article:<\/p>\n<p><\/p>\n<p><em>react-app \/ src \/ ErrorBoundary.js<\/em><\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">import React, { Component } from &#039;react&#039;;\nimport * as Sentry from &#039;@sentry\/browser&#039;;\n\nexport default class ErrorBoundary extends Component {\n  constructor(props) {\n    super(props);\n    this.state = { hasError: false };\n  }\n\n  componentDidCatch(err, info) {\n    this.setState({ hasError: true });\n    Sentry.captureException(err);\n  }\n\n  render() {\n    if (this.state.hasError) {\n      return &lt;h1&gt;Something went wrong.&lt;\/h1&gt;;\n    }\n    return this.props.children;\n  }\n}<\/code><\/pre>\n<p><\/p>\n<p>Finally, we use this component:<\/p>\n<p><\/p>\n<p><em>react-app \/ src \/ App.js<\/em><\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">...import MyRenderError from &#039;.\/MyRenderError&#039;;\n\nclass App extends Component {\n  render() {\n    return (\n      &lt;errorboundary&gt;\n        &lt;div classname=&quot;App&quot;&gt;\n          ...\n        &lt;\/div&gt;\n      &lt;\/errorboundary&gt;\n    );\n  }\n}\n...<\/code><\/pre>\n<p><\/p>\n<p>With this, pressing the Render Error button displays the fallback UI and reports the error to Sentry.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry remote bug monitoring in React frontend applications\" src=\"\/wp-content\/uploads\/2020\/07\/e410ee6355f5d423281fe278b638a09d.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry remote bug monitoring in React frontend applications\" src=\"\/wp-content\/uploads\/2020\/07\/58183f6f6aef124e8d14acaaf7e0d4fe.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><strong>Completion<\/strong><\/p>\n<p><\/p>\n<p>I hope you found this useful.<\/p>\n<p><\/p>\n<p>P.S. <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/@johntucker_48673\/sentry-error-reporting-by-example-part-2-cd7b2f653be4\">Link to the original<\/a><\/noindex> <\/p>\n<p><\/p>\n<p>P.S. Telegram chat about Sentry <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/sentry_ru\">https:\/\/t.me\/sentry_ru<\/a><\/noindex><\/p>\n<p>Source: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/509362\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u044b \u0438\u0437\u0443\u0447\u0430\u0435\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 Sentry \u0441 React. \u042d\u0442\u0430 \u0441\u0442\u0430\u0442\u044c\u044f \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0447\u0430\u0441\u0442\u044c\u044e \u0441\u0435\u0440\u0438\u0438, \u043d\u0430\u0447\u0438\u043d\u0430\u044e\u0449\u0435\u0439\u0441\u044f \u0441 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u043e\u0431 \u043e\u0448\u0438\u0431\u043a\u0430\u0445 Sentry \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u0440\u0435: \u0427\u0430\u0441\u0442\u044c 1. \u0420\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f React \u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u043d\u043e\u0432\u044b\u0439 \u043f\u0440\u043e\u0435\u043a\u0442 Sentry \u0434\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f; \u0441 \u0441\u0430\u0439\u0442\u0430 Sentry. \u0412 \u044d\u0442\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u043c\u044b \u0432\u044b\u0431\u0438\u0440\u0430\u0435\u043c React. \u041c\u044b \u0432\u043d\u043e\u0432\u044c \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u0435\u043c \u043d\u0430\u0448\u0438 \u0434\u0432\u0435 \u043a\u043d\u043e\u043f\u043a\u0438, Hello \u0438 Error, \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435 \u0441 React. \u041c\u044b 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