metamask-extension/app/scripts/lib/setupSentry.js

import * as Sentry from '@sentry/browser'
import { Dedupe, ExtraErrorData } from '@sentry/integrations'

import extractEthjsErrorMessage from './extractEthjsErrorMessage'

const METAMASK_DEBUG = process.env.METAMASK_DEBUG
const METAMASK_ENVIRONMENT = process.env.METAMASK_ENVIRONMENT
const SENTRY_DSN_PROD = 'https://3567c198f8a8412082d32655da2961d0@sentry.io/273505'
const SENTRY_DSN_DEV = 'https://f59f3dd640d2429d9d0e2445a87ea8e1@sentry.io/273496'

export default function setupSentry ({ release }) {
  let sentryTarget

  if (METAMASK_DEBUG || process.env.IN_TEST) {
    console.log(`Setting up Sentry Remote Error Reporting for '${METAMASK_ENVIRONMENT}': SENTRY_DSN_DEV`)
    sentryTarget = SENTRY_DSN_DEV
  } else {
    console.log(`Setting up Sentry Remote Error Reporting for '${METAMASK_ENVIRONMENT}': SENTRY_DSN_PROD`)
    sentryTarget = SENTRY_DSN_PROD
  }

  Sentry.init({
    dsn: sentryTarget,
    debug: METAMASK_DEBUG,
    environment: METAMASK_ENVIRONMENT,
    integrations: [
      new Dedupe(),
      new ExtraErrorData(),
    ],
    release,
    beforeSend: (report) => rewriteReport(report),
  })

  function rewriteReport (report) {
    try {
      // simplify certain complex error messages (e.g. Ethjs)
      simplifyErrorMessages(report)
      // modify report urls
      rewriteReportUrls(report)
    } catch (err) {
      console.warn(err)
    }
    return report
  }

  return Sentry
}

function simplifyErrorMessages (report) {
  rewriteErrorMessages(report, (errorMessage) => {
    // simplify ethjs error messages
    errorMessage = extractEthjsErrorMessage(errorMessage)
    // simplify 'Transaction Failed: known transaction'
    if (errorMessage.indexOf('Transaction Failed: known transaction') === 0) {
      // cut the hash from the error message
      errorMessage = 'Transaction Failed: known transaction'
    }
    return errorMessage
  })
}

function rewriteErrorMessages (report, rewriteFn) {
  // rewrite top level message
  if (typeof report.message === 'string') {
    report.message = rewriteFn(report.message)
  }
  // rewrite each exception message
  if (report.exception && report.exception.values) {
    report.exception.values.forEach((item) => {
      if (typeof item.value === 'string') {
        item.value = rewriteFn(item.value)
      }
    })
  }
}

function rewriteReportUrls (report) {
  // update request url
  report.request.url = toMetamaskUrl(report.request.url)
  // update exception stack trace
  if (report.exception && report.exception.values) {
    report.exception.values.forEach((item) => {
      if (item.stacktrace) {
        item.stacktrace.frames.forEach((frame) => {
          frame.filename = toMetamaskUrl(frame.filename)
        })
      }
    })
  }
}

function toMetamaskUrl (origUrl) {
  const filePath = origUrl.split(window.location.origin)[1]
  if (!filePath) {
    return origUrl
  }
  const metamaskUrl = `metamask${filePath}`
  return metamaskUrl
}