Automatically cause reload to trigger devTools

Summary:
To connect to the React Devtools, the app has to be reload (or the dev menu opened).
This diff does force a reload if the React Devtools don't connect timely

Reviewed By: passy

Differential Revision: D19878172

fbshipit-source-id: 0b3e22f70c9d24dae1fdbf0cc351d23367654ae1

src/chrome/MetroButton.tsx

@@ -65,15 +65,7 @@ const ProgressBarBar = styled.div<{progress: number; color: string}>(
 function MetroButton({device}: Props) {
   const sendCommand = useCallback(
     (command: string) => {
-      if (device.ws) {
+      device.sendCommand(command);
-        device.ws.send(
-          JSON.stringify({
-            version: 2,
-            type: 'command',
-            command,
-          }),
-        );
-      }
     },
     [device],
   );

src/devices/MetroDevice.tsx

@@ -150,7 +150,7 @@ export default class MetroDevice extends BaseDevice {
     ws.onmessage = this._handleWSMessage;
   }
 
-  _handleWSMessage = ({data}: any) => {
+  private _handleWSMessage = ({data}: any) => {
     const message: MetroReportableEvent = JSON.parse(data);
     if (message.type === 'client_log') {
       const type: LogLevel = metroLogLevelMapping[message.level] || 'unknown';
@@ -182,6 +182,21 @@ export default class MetroDevice extends BaseDevice {
     this.metroEventEmitter.emit('event', message);
   };
 
+  sendCommand(command: string, params?: any) {
+    if (this.ws) {
+      this.ws.send(
+        JSON.stringify({
+          version: 2,
+          type: 'command',
+          command,
+          params,
+        }),
+      );
+    } else {
+      console.warn('Cannot send command, no connection', command);
+    }
+  }
+
   archive() {
     return new ArchivedDevice(
       this.serial + v4(),

src/plugins/reactdevtools/index.tsx

@@ -7,9 +7,19 @@
  * @format
  */
 
+// import {ReactReduxContext} from 'react-redux';
 import ReactDevToolsStandalone from 'react-devtools-core/standalone';
-import {FlipperPlugin, AndroidDevice, styled, View, Toolbar} from 'flipper';
+import {
-import React from 'react';
+  FlipperPlugin,
+  AndroidDevice,
+  styled,
+  View,
+  Toolbar,
+  MetroDevice,
+  ReduxState,
+  connect,
+} from 'flipper';
+import React, {useEffect} from 'react';
 import getPort from 'get-port';
 import address from 'address';
 
@@ -54,7 +64,30 @@ function detachDevTools(devToolsNode: HTMLElement) {
 
 const CONNECTED = 'DevTools connected';
 
-export default class extends FlipperPlugin<
+type GrabMetroDeviceStoreProps = {metroDevice: MetroDevice};
+type GrabMetroDeviceOwnProps = {onHasDevice(device: MetroDevice): void};
+
+// Utility component to grab the metroDevice from the store if there is one
+const GrabMetroDevice = connect<
+  GrabMetroDeviceStoreProps,
+  {},
+  GrabMetroDeviceOwnProps,
+  ReduxState
+>(({connections: {devices}}) => ({
+  metroDevice: devices.find(
+    device => device.os === 'Metro' && !device.isArchived,
+  ) as MetroDevice,
+}))(function({
+  metroDevice,
+  onHasDevice,
+}: GrabMetroDeviceStoreProps & GrabMetroDeviceOwnProps) {
+  useEffect(() => {
+    onHasDevice(metroDevice);
+  }, [metroDevice]);
+  return null;
+});
+
+export default class ReactDevTools extends FlipperPlugin<
   {
     status: string;
   },
@@ -64,6 +97,7 @@ export default class extends FlipperPlugin<
   pollHandle?: NodeJS.Timeout;
   containerRef: React.RefObject<HTMLDivElement> = React.createRef();
   triedToAutoConnect = false;
+  metroDevice?: MetroDevice;
 
   state = {
     status: 'initializing',
@@ -98,7 +132,7 @@ export default class extends FlipperPlugin<
   }
 
   setStatus(status: string) {
-    console.log(`[ReactDevtoolsPlugin] ${status}`);
+    // console.log(`[ReactDevtoolsPlugin] ${status}`);
     if (status.startsWith('The server is listening on')) {
       this.setState({status: status + ' Waiting for connection...'});
     } else {
@@ -114,9 +148,14 @@ export default class extends FlipperPlugin<
         if (!this.triedToAutoConnect) {
           this.triedToAutoConnect = true;
           this.setStatus(
-            "The DevTools didn't connect yet. Please open the DevMenu or Reload to connect",
+            "The DevTools didn't connect yet. Please open the DevMenu in the React Native app, or Reload it to connect",
           );
-          // TODO: send reload command
+          if (this.metroDevice) {
+            this.setStatus(
+              "Sending 'reload' to the Metro to force the DevTools to connect...",
+            );
+            this.metroDevice?.sendCommand('reload');
+          }
         }
         this.startPollForConnection();
       }
@@ -124,6 +163,7 @@ export default class extends FlipperPlugin<
   }
 
   async initializeDevTools(devToolsNode: HTMLElement) {
+    try {
       this.setStatus('Waiting for port 8097');
       const port = await getPort({port: 8097}); // default port for dev tools
       this.setStatus('Starting DevTools server on ' + port);
@@ -151,6 +191,10 @@ export default class extends FlipperPlugin<
           (device as AndroidDevice).reverse([port, port]);
         }
       }
+    } catch (e) {
+      console.error(e);
+      this.setStatus('Failed to initialize DevTools: ' + e);
+    }
   }
 
   render() {
@@ -160,6 +204,11 @@ export default class extends FlipperPlugin<
           <Toolbar>{this.state.status}</Toolbar>
         ) : null}
         <Container ref={this.containerRef} />
+        <GrabMetroDevice
+          onHasDevice={device => {
+            this.metroDevice = device;
+          }}
+        />
       </View>
     );
   }