{"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\/it\/blog\/administrirovanie\/sentry-udalennyj-monitoring-bagov-v-frontend-prilozheniyah-react","title":{"rendered":"Sentry monitoraggio remoto dei bug nelle applicazioni frontend React","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Studiamo l'uso di Sentry con React.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry monitoraggio remoto dei bug nelle applicazioni frontend React\" src=\"\/wp-content\/uploads\/2020\/07\/6ea51ae73accae0c36e0130b830c1ca2.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Questo articolo fa parte di una serie che inizia con il messaggio di errore Sentry a titolo di esempio: <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/508686\/\">Parte 1<\/a><\/noindex>. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p><strong>Implementazione di React<\/strong> <\/p>\n<p><\/p>\n<p>Per prima cosa, dobbiamo aggiungere un nuovo progetto Sentry per questa applicazione; dal sito di Sentry. In questo caso, scegliamo React.<\/p>\n<p><\/p>\n<p>Implementiamo di nuovo i nostri due pulsanti, Hello ed Error, utilizzando React. Iniziamo creando la nostra applicazione di base:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">npx create-react-app react-app<\/code><\/pre>\n<p><\/p>\n<p>Poi importiamo il pacchetto Sentry:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">yarn add @sentry\/browser<\/code><\/pre>\n<p><\/p>\n<p>e lo inizializziamo:<\/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>Osservazioni:<\/p>\n<p><\/p>\n<ul>\n<li>Durante lo sviluppo abbiamo altri meccanismi per monitorare i problemi, ad esempio la console, quindi attiviamo Sentry solo per le build di produzione.<\/li>\n<\/ul>\n<p><\/p>\n<p>Poi implementiamo i nostri pulsanti Hello ed Error e li aggiungiamo all'applicazione:<\/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\">...&lt;br \/&gt;import Hello from &#039;.\/Hello&#039;;&lt;br \/&gt;import MyError from &#039;.\/MyError&#039;;&lt;br \/&gt;&lt;br \/&gt;class App extends Component {&lt;br \/&gt;  render() {&lt;br \/&gt;    return (\n      &lt;div classname=&quot;App&quot;&gt;\n        ...\n        &lt;hello \/&gt;\n        &lt;myerror \/&gt;\n      &lt;\/div&gt;\n    );&lt;br \/&gt;  }&lt;br \/&gt;}&lt;br \/&gt;&lt;br \/&gt;export default App;<\/code><\/pre>\n<p><\/p>\n<p><strong>Problema (Sorgenti Mappa)<\/strong><\/p>\n<p><\/p>\n<p>Possiamo testare Sentry con una build di produzione eseguendo:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">yarn build<\/code><\/pre>\n<p><\/p>\n<p>e dalla cartella build eseguendo:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">npx http-server -c-1<\/code><\/pre>\n<p><\/p>\n<p>Il problema con cui ci troveremo immediatamente \u00e8 che le registrazioni degli errori di Sentry fanno riferimento ai numeri di riga nel pacchetto ridotto; non molto utile.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry monitoraggio remoto dei bug nelle applicazioni frontend React\" src=\"\/wp-content\/uploads\/2020\/07\/e5b320f731249bad65a82e33c4e09b43.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Il servizio Sentry spiega questo estraendo le mappe sorgente per il pacchetto ridotto dopo aver ricevuto l'errore. In questo caso, ci troviamo a correre da localhost (non accessibile dal servizio Sentry).<\/p>\n<p><\/p>\n<p><strong>Soluzioni (Mappe Sorgente)<\/strong><\/p>\n<p><\/p>\n<p>La soluzione a questo problema consiste nel lanciare l'applicazione da un server web pubblico. Un semplice pulsante di risposta sarebbe quello di utilizzare il servizio GitHub Pages (gratuito). I passaggi per l'uso sono solitamente i seguenti:<\/p>\n<p><\/p>\n<ol>\n<li>\n<p>Copia il contenuto della cartella <em>build<\/em> nella cartella <em>docs<\/em> nella radice del repository.<\/p>\n<p>\n<\/li>\n<li>\n<p>Abilita <em>GitHub Pages<\/em> nel repository (da GitHub) per utilizzare la cartella docs in <em>master<\/em> branca<\/p>\n<p>\n<\/li>\n<li>\n<p>Spingi le modifiche su GitHub<\/p>\n<p>\n<\/li>\n<\/ol>\n<p><\/p>\n<p><strong>Nota<\/strong>: dopo che ho capito di dover usare <em>create-react-app<\/em> la funzione homepage per lanciare l'applicazione. Si \u00e8 trattato di aggiungere quanto segue a 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>La versione finale dell'applicazione in esecuzione \u00e8 disponibile all'indirizzo:<\/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>Illustrazione degli Errori Catturati<\/strong><\/p>\n<p><\/p>\n<p>Facciamo clic sul pulsante Hello.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry monitoraggio remoto dei bug nelle applicazioni frontend React\" src=\"\/wp-content\/uploads\/2020\/07\/1dbe7845b2e3d04933344d3d18dac01f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Con l'errore che appare nel seguente modo:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry monitoraggio remoto dei bug nelle applicazioni frontend React\" src=\"\/wp-content\/uploads\/2020\/07\/621f0f12eb77b7dd413d168c35c141d4.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Osservazioni:<\/p>\n<p><\/p>\n<ul>\n<li>Questa segnalazione di errore non potrebbe essere pi\u00f9 chiara, <strong>BRAVO<\/strong>.<\/li>\n<\/ul>\n<p><\/p>\n<p><strong>Illustrazione degli Errori Non Gestiti<\/strong><\/p>\n<p><\/p>\n<p>Allo stesso modo, esaminiamo il clic sul pulsante <em>Error<\/em>.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry monitoraggio remoto dei bug nelle applicazioni frontend React\" src=\"\/wp-content\/uploads\/2020\/07\/65c07bc6db9f6b577ecb79dfd3336b38.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Con l'errore che appare nel seguente modo:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry monitoraggio remoto dei bug nelle applicazioni frontend React\" src=\"\/wp-content\/uploads\/2020\/07\/f4d668075885bb66ce0158588bff038c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><strong>La migliore gestione degli errori non gestiti (rendering)<\/strong><\/p>\n<p><\/p>\n<blockquote><p>Introduzione ai Limiti degli Errori<\/p>\n<p>Un errore di JavaScript nell'interfaccia utente non dovrebbe compromettere l'intera applicazione. Per risolvere questo problema per gli utenti di React, React 16 introduce il nuovo concetto di \"confini di errore\".<\/p>\n<p>I limiti degli errori sono componenti React che catturano errori JavaScript in qualsiasi parte del loro albero di componenti figli, registrano questi errori e visualizzano un'interfaccia utente di fallback invece dell'albero di componenti che si \u00e8 guastato. I limiti degli errori catturano errori durante il rendering, nei metodi del ciclo di vita e nei costruttori di tutto l'albero sottostante.<\/p>\n<p>\u2026<\/p>\n<p>Nuovo comportamento per errori non rilevati<\/p>\n<p>Questa modifica \u00e8 significativa. A partire da React 16, gli errori che non vengono catturati da alcun limite degli errori porteranno al disassemblaggio dell'intero albero dei componenti React.<\/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>Gestione degli Errori in React 16<\/em><\/a><\/noindex><\/p><\/blockquote>\n<p>Un'importante precisazione che mi ha richiesto un po' di tempo prima di comprendere \u00e8 che <strong>il comportamento sopra menzionato funziona solo con gli errori generati nel metodo di rendering (o, pi\u00f9 probabilmente, in uno qualsiasi dei metodi del ciclo di vita)<\/strong>. Ad esempio, l'uso dei confini degli errori non sarebbe di alcuna utilit\u00e0 con il nostro pulsante <em>Error<\/em>; questo errore era nel gestore del clic.<\/p>\n<p><\/p>\n<p>Creiamo un esempio di errore di rendering e poi utilizziamo i confini degli errori per una gestione degli errori pi\u00f9 elegante.<\/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          Errore di rendering\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>Osservazione:<\/p>\n<p><\/p>\n<ul>\n<li>\n<p>Quando si preme il pulsante, <em>React<\/em> verr\u00e0 visualizzato <em>flag.busted.bogus<\/em>, che genera un errore<\/p>\n<p>\n<\/li>\n<li>\n<p>Senza il confine degli errori, l'intero albero dei componenti verr\u00e0 smontato<\/p>\n<p>\n<\/li>\n<\/ul>\n<p><\/p>\n<p>Poi scriviamo il nostro codice per il confine degli errori (usa il nuovo metodo del ciclo di vita <em>componentDidCatch<\/em>); questo \u00e8, in sostanza, un esempio fornito nell'articolo di Dan Abramov:<\/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;Qualcosa &egrave; andato storto.&lt;\/h1&gt;;\n    }\n    return this.props.children;\n  }\n}<\/code><\/pre>\n<p><\/p>\n<p>Infine, utilizziamo questo componente:<\/p>\n<p><\/p>\n<p><em>react-app \/ src \/ App.js<\/em><\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">...\nimport 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>In questo modo, premendo il pulsante Render Error viene visualizzato un'interfaccia utente di riserva e viene segnalato l'errore a Sentry.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Sentry monitoraggio remoto dei bug nelle applicazioni frontend React\" 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 monitoraggio remoto dei bug nelle applicazioni frontend React\" src=\"\/wp-content\/uploads\/2020\/07\/58183f6f6aef124e8d14acaaf7e0d4fe.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><strong>Conclusione<\/strong><\/p>\n<p><\/p>\n<p>Spero che ti sia stato utile.<\/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 all'originale<\/a><\/noindex> <\/p>\n<p><\/p>\n<p>P.S. Chat Telegram su Sentry <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/sentry_ru\">https:\/\/t.me\/sentry_ru<\/a><\/noindex><\/p>\n<p>Fonte: <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; 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