Add error boundary to nake frontend more resiliant

Allows users to recover from errors in userStorage

Is related to #23

app/src/App.tsx

@@ -12,6 +12,7 @@ import TitleBar from './components/TitleBar'
 import Tree from './components/Tree/Tree'
 import UpdateNotifier from './UpdateNotifier'
 import { connect } from 'react-redux'
+import ErrorBoundary from './ErrorBoundary'
 
 interface State {
   selectedNode?: q.TreeNode,
@@ -82,25 +83,28 @@ class App extends React.Component<Props, State> {
   public render() {
     const { settingsVisible } = this.props
     const { content, contentShift, centerContent } = this.getStyles()
+
     return (
       <div style={centerContent}>
         <CssBaseline />
-        <Settings />
+        <ErrorBoundary>
-        <div style={settingsVisible ? contentShift : content}>
+          <Settings />
-            <TitleBar />
+          <div style={settingsVisible ? contentShift : content}>
-            <div style={centerContent}>
+              <TitleBar />
-              <div style={this.getStyles().left}>
+              <div style={centerContent}>
-                <Tree connectionId={this.state.connectionId} didSelectNode={(node: q.TreeNode) => {
+                <div style={this.getStyles().left}>
-                  this.setState({ selectedNode: node })
+                  <Tree connectionId={this.state.connectionId} didSelectNode={(node: q.TreeNode) => {
-                }} />
+                    this.setState({ selectedNode: node })
+                  }} />
+                </div>
+                <div style={this.getStyles().right}>
+                  <Sidebar connectionId={this.state.connectionId} />
+                </div>
               </div>
-              <div style={this.getStyles().right}>
+          </div>
-                <Sidebar connectionId={this.state.connectionId} />
+          <UpdateNotifier />
-              </div>
+          <Connection onConnection={(connectionId: string) => this.setState({ connectionId })}/>
-            </div>
+        </ErrorBoundary>
-        </div>
-        <UpdateNotifier />
-        <Connection onConnection={(connectionId: string) => this.setState({ connectionId })}/>
       </div >
     )
   }

app/src/ErrorBoundary.tsx

@@ -0,0 +1,103 @@
+import * as React from 'react'
+import * as q from '../../backend/src/Model'
+import {
+  Button,
+  Modal,
+  Paper,
+  Toolbar,
+  Typography,
+} from '@material-ui/core'
+
+import Warning from '@material-ui/icons/Warning'
+import SentimentDissatisfied from '@material-ui/icons/SentimentDissatisfied'
+
+import { Theme, withStyles } from '@material-ui/core/styles'
+
+interface State {
+  error?: Error
+}
+
+interface Props {
+  classes: any
+}
+
+class ErrorBoundary extends React.Component<Props, State> {
+  constructor(props: Props) {
+    super(props)
+    this.state = {}
+  }
+
+  public componentDidCatch(error: Error, errorInfo: any) {
+    console.log('did catch', error)
+  }
+
+  public static getDerivedStateFromError(error: Error) {
+    return { error }
+  }
+
+  private restart = () => {
+    window.location = window.location
+  }
+
+  private clearStorage = () => {
+    localStorage.clear()
+    window.location = window.location
+  }
+
+  public render() {
+    if (!this.state.error) {
+      return this.props.children
+    }
+
+    const { classes } = this.props
+    return (
+      <Modal open={true} disableAutoFocus={true}>
+        <Paper className={classes.root}>
+          <Toolbar style={{ padding: '0' }}>
+            <Typography className={classes.title} variant="h6" color="inherit"><Warning /> Oooooops!</Typography>
+          </Toolbar>
+          <Typography>I hoped that you would never see this window, but MQTT-Explorer had an unexpected error.</Typography>
+          <Typography style={{ textAlign: 'center' }}><SentimentDissatisfied /></Typography>
+          <pre className={classes.textColor} style={{ maxHeight: '40vh', overflow: 'scroll' }}>
+            <code className={classes.textColor}>
+              {this.state.error.stack}
+            </code>
+          </pre>
+          <Typography>
+            Please report this issue with a short description of what happened to
+            <span> <a className={classes.textColor} href="https://github.com/thomasnordquist/MQTT-Explorer/issues">https://github.com/thomasnordquist/MQTT-Explorer/issues</a></span>
+          </Typography>
+          <div>
+            <div className={classes.buttonPositioning}><Button onClick={this.restart}>Restart</Button></div>
+            <div className={classes.buttonPositioning}><Button onClick={this.clearStorage}>Start Fresh</Button></div>
+          </div>
+        </Paper>
+      </Modal>
+    )
+  }
+}
+
+const styles = (theme: Theme) => ({
+  root: {
+    minWidth: 550,
+    maxWidth: 650,
+    backgroundColor: theme.palette.background.default,
+    margin: '14vh auto auto auto',
+    padding: `${2 * theme.spacing.unit}px`,
+    outline: 'none',
+  },
+  title: {
+    color: theme.palette.text.primary,
+    margin: '0',
+    textAlign: 'center' as 'center',
+  },
+  textColor: {
+    color: theme.palette.text.primary,
+  },
+  buttonPositioning: {
+    textAlign: 'center' as 'center',
+    marginTop: `${theme.spacing.unit * 2}px`,
+  },
+})
+
+export default withStyles(styles)(ErrorBoundary)

app/src/tracking.ts

@@ -1,3 +1,4 @@
+import { rendererEvents, trackError, trackUserInteraction } from '../../events'
 let userId = window.localStorage.getItem('userId')
 const sha1 = require('sha1')