Throw error and let user know situation when 'adb shell screenrecord' make error.

Summary:
Backgrouds
- For screen recording Flipper use 'adb shell scrrenrecord' and 'adb pull'.
- 'screenrecord' make error and doens't works for some android devices and AOS versions.
- For example, "--bugreport" option doesn't work old version of AOS.
- We can not control 'screenrecord' command yet.
- It is better let user know the situation early.

<AS-IS>
When 'screenrecord' emit error:
- Noting happened for users.
- Result of screen record file is just empty. (pull command create the file)

<TO-BE>
When 'screenrecord' emit error:
- Let users know 'screenrecord' is not working properly.

Reviewed By: passy

Differential Revision: D19643060

fbshipit-source-id: 5caf9df02c956283f371c50c1735060be2158fb2

src/chrome/ScreenCaptureButtons.tsx

@@ -102,10 +102,8 @@ class ScreenCaptureButtons extends Component<Props, State> {
       return;
     }
     const videoPath = path.join(CAPTURE_LOCATION, getFileName('mp4'));
-    await selectedDevice.startScreenCapture(videoPath);
-
-    this.setState({
-      recording: true,
+    await selectedDevice.startScreenCapture(videoPath).catch(e => {
+      console.error(e);
     });
   };
 
@@ -114,18 +112,23 @@ class ScreenCaptureButtons extends Component<Props, State> {
     if (!selectedDevice) {
       return;
     }
-    const path = await selectedDevice.stopScreenCapture();
-    this.setState({
-      recording: false,
+    const path = await selectedDevice.stopScreenCapture().catch(e => {
+      console.error(e);
     });
-    openFile(path);
+    path ? openFile(path) : 0;
   };
 
   onRecordingClicked = () => {
     if (this.state.recording) {
       this.stopRecording();
+      this.setState({
+        recording: false,
+      });
     } else {
       this.startRecording();
+      this.setState({
+        recording: true,
+      });
     }
   };
 

src/devices/AndroidDevice.tsx

@@ -132,6 +132,21 @@ export default class AndroidDevice extends BaseDevice {
     }
   }
 
+  private async isValidFile(filePath: string): Promise<boolean> {
+    const fileSize = await this.adb
+      .shell(this.serial, `touch "${filePath}" && ls -l "${filePath}"`)
+      .then(adb.util.readAll)
+      .then((output: Buffer) =>
+        output
+          .toString()
+          .trim()
+          .split(' '),
+      )
+      .then(output => Number(output[5]));
+
+    return fileSize > 0;
+  }
+
   async startScreenCapture(destination: string) {
     await this.executeShell(
       `mkdir -p "${DEVICE_RECORDING_DIR}" && echo -n > "${DEVICE_RECORDING_DIR}/.nomedia"`,
@@ -140,15 +155,29 @@ export default class AndroidDevice extends BaseDevice {
     this.recordingProcess = this.adb
       .shell(this.serial, `screenrecord --bugreport "${recordingLocation}"`)
       .then(adb.util.readAll)
+      .then(
+        output =>
+          new Promise(async (resolve, _) => {
+            const isValid = await this.isValidFile(recordingLocation);
+            if (!isValid) {
+              const outputMessage = output.toString().trim();
+              // throw error immediately
+              throw new Error(
+                'Recording was not properly started: \n' + outputMessage,
+              );
+            }
+            resolve();
+          }),
+      )
       .then(
         _ =>
-          new Promise((resolve, reject) =>
+          new Promise((resolve, reject) => {
             this.adb.pull(this.serial, recordingLocation).then(stream => {
               stream.on('end', resolve);
               stream.on('error', reject);
               stream.pipe(createWriteStream(destination));
-            }),
-          ),
+            });
+          }),
       )
       .then(_ => destination);
   }