android: allow registering custom packager command handlers

Summary:
@public
Apps may need to listen for custom commands via the packager connection. This allows registering such listeners.

Reviewed By: raluca-elena

Differential Revision: D8654477

fbshipit-source-id: 5f17298a88fec31b8939236fef48ee46c0ba2ee8

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java

@@ -81,6 +81,13 @@ public class DevServerHelper {
     void onPackagerReloadCommand();
     void onPackagerDevMenuCommand();
     void onCaptureHeapCommand(final Responder responder);
+
+    // Allow apps to provide listeners for custom packager commands.
+    @Nullable Map<String, RequestHandler> customCommandHandlers();
+  }
+
+  public interface PackagerCustomCommandProvider {
+
   }
 
   public interface SymbolicationListener {
@@ -162,6 +169,10 @@ public class DevServerHelper {
             commandListener.onCaptureHeapCommand(responder);
           }
         });
+        Map<String, RequestHandler> customHandlers = commandListener.customCommandHandlers();
+        if (customHandlers != null) {
+          handlers.putAll(customHandlers);
+        }
         handlers.putAll(new FileIoHandler().handlers());
 
         ConnectionCallback onPackagerConnectedCallback =

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerFactory.java

@@ -11,8 +11,10 @@ import android.content.Context;
 
 import com.facebook.react.devsupport.interfaces.DevBundleDownloadListener;
 import com.facebook.react.devsupport.interfaces.DevSupportManager;
+import com.facebook.react.packagerconnection.RequestHandler;
 
 import java.lang.reflect.Constructor;
+import java.util.Map;
 
 import javax.annotation.Nullable;
 
@@ -41,7 +43,8 @@ public class DevSupportManagerFactory {
       enableOnCreate,
       null,
       null,
-      minNumShakes);
+      minNumShakes,
+      null);
   }
 
   public static DevSupportManager create(
@@ -51,7 +54,8 @@ public class DevSupportManagerFactory {
     boolean enableOnCreate,
     @Nullable RedBoxHandler redBoxHandler,
     @Nullable DevBundleDownloadListener devBundleDownloadListener,
-    int minNumShakes) {
+    int minNumShakes,
+    @Nullable Map<String, RequestHandler> customPackagerCommandHandlers) {
     if (!enableOnCreate) {
       return new DisabledDevSupportManager();
     }
@@ -74,7 +78,8 @@ public class DevSupportManagerFactory {
           boolean.class,
           RedBoxHandler.class,
           DevBundleDownloadListener.class,
-          int.class);
+          int.class,
+          Map.class);
       return (DevSupportManager) constructor.newInstance(
         applicationContext,
         reactInstanceManagerHelper,
@@ -82,7 +87,8 @@ public class DevSupportManagerFactory {
         true,
         redBoxHandler,
         devBundleDownloadListener,
-        minNumShakes);
+        minNumShakes,
+        customPackagerCommandHandlers);
     } catch (Exception e) {
       throw new RuntimeException(
         "Requested enabled DevSupportManager, but DevSupportManagerImpl class was not found" +

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerImpl.java

@@ -60,6 +60,7 @@ import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
@@ -150,6 +151,8 @@ public class DevSupportManagerImpl implements
 
   private InspectorPackagerConnection.BundleStatus mBundleStatus;
 
+  private @Nullable Map<String, RequestHandler> mCustomPackagerCommandHandlers;
+
   private static class JscProfileTask extends AsyncTask<String, Void, Void> {
     private static final MediaType JSON =
       MediaType.parse("application/json; charset=utf-8");
@@ -196,7 +199,8 @@ public class DevSupportManagerImpl implements
       enableOnCreate,
       null,
       null,
-      minNumShakes);
+      minNumShakes,
+      null);
   }
 
   public DevSupportManagerImpl(
@@ -206,7 +210,8 @@ public class DevSupportManagerImpl implements
       boolean enableOnCreate,
       @Nullable RedBoxHandler redBoxHandler,
       @Nullable DevBundleDownloadListener devBundleDownloadListener,
-      int minNumShakes) {
+      int minNumShakes,
+      @Nullable Map<String, RequestHandler> customPackagerCommandHandlers) {
     mReactInstanceManagerHelper = reactInstanceManagerHelper;
     mApplicationContext = applicationContext;
     mJSAppBundleName = packagerPathForJSBundleName;
@@ -232,6 +237,8 @@ public class DevSupportManagerImpl implements
       }
     }, minNumShakes);
 
+    mCustomPackagerCommandHandlers = customPackagerCommandHandlers;
+
     // Prepare reload APP broadcast receiver (will be registered/unregistered from #reload)
     mReloadAppBroadcastReceiver = new BroadcastReceiver() {
       @Override
@@ -841,6 +848,11 @@ public class DevSupportManagerImpl implements
     });
   }
 
+  @Override
+  public @Nullable Map<String, RequestHandler> customCommandHandlers() {
+    return mCustomPackagerCommandHandlers;
+  }
+
   private void handleCaptureHeap(final Responder responder) {
     if (mCurrentContext == null) {
       return;