Move adb client creation into it's own file

Summary: Allows the created client to be reused.

Reviewed By: passy

Differential Revision: D14241449

fbshipit-source-id: 6bbb64eeb708dce9c24e4581e8480d19af998e47

src/utils/adbClient.js

@@ -0,0 +1,72 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+import {reportPlatformFailures} from './metrics';
+import {promisify} from 'util';
+import child_process from 'child_process';
+import promiseRetry from 'promise-retry';
+import adbConfig from '../utils/adbConfig';
+import adbkit from 'adbkit-fb';
+
+let instance;
+
+export function getAdbClient(): Promise<any> {
+  if (!instance) {
+    instance = reportPlatformFailures(createClient(), 'createADBClient');
+  }
+  return instance;
+}
+
+/* Adbkit will attempt to start the adb server if it's not already running,
+   however, it sometimes fails with ENOENT errors. So instead, we start it
+   manually before requesting a client. */
+function createClient() {
+  const adbPath = process.env.ANDROID_HOME
+    ? `${process.env.ANDROID_HOME}/platform-tools/adb`
+    : 'adb';
+  return reportPlatformFailures(
+    promisify(child_process.exec)(`${adbPath} start-server`)
+      .then(result => {
+        if (result.error) {
+          throw new Error(
+            `Failed to start adb server: ${result.stderr.toString()}`,
+          );
+        }
+      })
+      .then(() => adbkit.createClient(adbConfig())),
+    'createADBClient.shell',
+  ).catch(err => {
+    console.error(
+      'Failed to create adb client using shell adb command. Trying with adbkit',
+    );
+
+    /* In the event that starting adb with the above method fails, fallback
+       to using adbkit, though its known to be unreliable. */
+    const unsafeClient = adbkit.createClient(adbConfig());
+    return reportPlatformFailures(
+      promiseRetry(
+        (retry, number) => {
+          return unsafeClient
+            .listDevices()
+            .then(() => {
+              return unsafeClient;
+            })
+            .catch(e => {
+              console.warn(
+                `Failed to start adb client. Retrying. ${e.message}`,
+              );
+              retry(e);
+            });
+        },
+        {
+          minTimeout: 200,
+          retries: 5,
+        },
+      ),
+      'createADBClient.adbkit',
+    );
+  });
+}