List contents of Flipper folder on Android

Summary:
Design doc: https://docs.google.com/document/d/1HLCFl46RfqG0o1mSt8SWrwf_HMfOCRg_oENioc1rkvQ/edit#

In later diffs, we'll start fetching the actual files as well. The list of available files itself might be useful already to see what we have in our folder on the device

Reviewed By: passy

Differential Revision: D40508960

fbshipit-source-id: 96193fef3fed64d509cd3397513ae3e94438ae22

desktop/flipper-server-core/src/FlipperServerImpl.tsx

@@ -53,6 +53,7 @@ import {initializeAdbClient} from './devices/android/adbClient';
 import {assertNotNull} from './comms/Utilities';
 import {mkdirp} from 'fs-extra';
 import {flipperDataFolder, flipperSettingsFolder} from './utils/paths';
+import {DebuggableDevice} from './devices/DebuggableDevice';
 
 const {access, copyFile, mkdir, unlink, stat, readlink, readFile, writeFile} =
   promises;
@@ -419,10 +420,7 @@ export class FlipperServerImpl implements FlipperServer {
     'device-clear-logs': async (serial) => this.getDevice(serial).clearLogs(),
     'device-navigate': async (serial, loc) =>
       this.getDevice(serial).navigateToLocation(loc),
-    'fetch-debug-data': async () => {
-      // TODO: Implement fetching client logs from all devices
-      return [];
-    },
+    'fetch-debug-data': () => this.fetchDebugLogs(),
     'metro-command': async (serial: string, command: string) => {
       const device = this.getDevice(serial);
       if (!(device instanceof MetroDevice)) {
@@ -604,6 +602,17 @@ export class FlipperServerImpl implements FlipperServer {
     return Array.from(this.devices.values());
   }
 
+  private async fetchDebugLogs() {
+    const debugDataForEachDevice = await Promise.all(
+      [...this.devices.values()]
+        .filter((device) => device.info.os === 'Android')
+        .map((device) =>
+          (device as unknown as DebuggableDevice).readFlipperFolderForAllApps(),
+        ),
+    );
+    return debugDataForEachDevice.flat();
+  }
+
   public async close() {
     this.server.close();
     for (const device of this.devices.values()) {