mpyw · August 14, 2018 17:46 · Aug 14, 2018
diff --git a/Logger.js b/Logger.js
@@ -0,0 +1,185 @@
+import React, { Component } from 'react'
+import CloudWatchLogs from 'aws-sdk/clients/cloudwatchlogs'
+import Fingerprint2 from 'fingerprintjs2'
+import StackTrace from 'stacktrace-js'
+import { promisify } from 'es6-promisify'
+
+export default class Logger {
+
+  events = []
+  originalConsole = null
+  intervalId = null
+
+  constructor(accessKeyId, secretAccessKey, region, group, levels = ['error'], interval = 10000, mute = false) {
+    this.valid = accessKeyId && secretAccessKey && region && group
+    this.client = new CloudWatchLogs({ accessKeyId, secretAccessKey, region })
+    this.client.createLogStreamAsync = promisify(this.client.createLogStream)
+    this.client.putLogEventsAsync = promisify(this.client.putLogEvents)
+    this.group = group
+    this.levels = levels
+    this.interval = interval
+    this.mute = mute
+  }
+
+  setCache(key, value) {
+    global.localStorage.setItem(`ConsoleCloudWatch:${key}`, value)
+  }
+
+  getCache(key) {
+    return global.localStorage.getItem(`ConsoleCloudWatch:${key}`)
+  }
+
+  deleteCache(key) {
+    return global.localStorage.removeItem(`ConsoleCloudWatch:${key}`)
+  }
+
+  init() {
+    const original = {}
+    for (const level of this.levels) {
+      original[level] = global.console[level]
+      global.console[level] = (message, ...args) => {
+        this.onError(message)
+        if (!this.mute) {
+          original[level](message, ...args)
+        }
+      }
+    }
+    this.originalConsole = original
+    this.intervalId = global.setInterval(this.onInterval.bind(this), this.interval)
+    global.addEventListener('error', this.onError.bind(this))
+  }
+
+  refresh() {
+    this.deleteCache('key')
+    this.deleteCache('sequenceToken')
+    this.events.splice(0)
+  }
+
+  async onError(e, info = {}) {
+    if (!this.valid) {
+      return
+    }
+    this.events.push({
+      message: await this.createPushMessageFromError(e, info),
+      timestamp: new Date().getTime(),
+    })
+  }
+
+  async onInterval() {
+    if (!this.valid) {
+      return
+    }
+    const pendingEvents = this.events.splice(0)
+    if (!pendingEvents.length) {
+      return
+    }
+    const key = await this.createOrRetrieveKey()
+    if (!key) {
+      return
+    }
+    const params = {
+      logEvents: pendingEvents,
+      logGroupName: this.group,
+      logStreamName: key,
+    }
+    const sequenceToken = this.getCache('sequenceToken')
+    if (sequenceToken) {
+      params.sequenceToken = sequenceToken
+    }
+    let nextSequenceToken, match
+    try {
+      ({ nextSequenceToken } = await this.client.putLogEventsAsync(params))
+    } catch (e) {
+      if (!e || e.code !== 'InvalidSequenceTokenException' || !(match = e.message.match(/The next expected sequenceToken is: (\w+)/))) {
+        this.originalConsole.error(e)
+        this.refresh()
+        return
+      }
+    }
+    this.setCache('sequenceToken', nextSequenceToken || match[1])
+  }
+
+  async createOrRetrieveKey() {
+    let key
+    if ((key = this.getCache('key'))) {
+      return key
+    }
+    try {
+      key = await new Promise((resolve) => new Fingerprint2().get(resolve))
+      await this.client.createLogStreamAsync({
+        logGroupName: this.group,
+        logStreamName: key,
+      })
+    } catch (e) {
+      if (!e || e.code !== 'ResourceAlreadyExistsException') {
+        this.originalConsole.error(e)
+        this.refresh()
+        return
+      }
+    }
+    this.setCache('key', key)
+    return key
+  }
+
+  async createPushMessageFromError(e, info = {}) {
+    const message = e && e.message ? e.message : e
+    const timestamp = new Date().getTime()
+    const userAgent = global.navigator.userAgent
+
+    let stack = null
+    if (e && e.message && e.stack) {
+      stack = e.stack
+      try {
+        stack = await StackTrace.fromError(e, { offline: true })
+      } catch (_) {
+      }
+    }
+
+    return JSON.stringify({
+      message,
+      timestamp,
+      userAgent,
+      stack,
+      ...info,
+    })
+  }
+
+  createLoggerMiddleware() {
+    return (store) => (next) => (action) => {
+      try {
+        return next(action)
+      } catch (e) {
+        this.onError(e, {
+          action,
+          state: store.getState(),
+          category: 'redux',
+        })
+      }
+    }
+  }
+
+  createLoggerComponent() {
+    const logger = this
+    return class LoggerComponent extends Component {
+
+      state = {
+        e: null,
+      }
+
+      componentDidCatch(e, info) {
+        this.setState({ e })
+        logger.onError(e, {
+          info,
+          category: 'react',
+        })
+      }
+
+      render() {
+        if (this.state.e) {
+          return <div>Fatal Error: {this.state.e.message}</div>
+        }
+        return this.props.children
+      }
+    }
+  }
+}