Add native module for loading split JS bundles in development

Reviewed By: mdvacca, cpojer

Differential Revision: D22001709

fbshipit-source-id: 4e378fd6ae90268e7db9092a71628205b9f7c37d

ReactAndroid/src/main/java/com/facebook/react/BUCK

@@ -35,6 +35,7 @@ rn_android_library(
         react_native_target("java/com/facebook/react/module/model:model"),
         react_native_target("java/com/facebook/react/modules/appregistry:appregistry"),
         react_native_target("java/com/facebook/react/modules/appearance:appearance"),
+        react_native_target("java/com/facebook/react/modules/bundleloader:bundleloader"),
         react_native_target("java/com/facebook/react/modules/debug:debug"),
         react_native_target("java/com/facebook/react/modules/fabric:fabric"),
         react_native_target("java/com/facebook/react/modules/debug:interfaces"),

ReactAndroid/src/main/java/com/facebook/react/CoreModulesPackage.java

@@ -21,6 +21,7 @@
 import com.facebook.react.module.annotations.ReactModuleList;
 import com.facebook.react.module.model.ReactModuleInfo;
 import com.facebook.react.module.model.ReactModuleInfoProvider;
+import com.facebook.react.modules.bundleloader.NativeDevSplitBundleLoaderModule;
 import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
 import com.facebook.react.modules.core.DeviceEventManagerModule;
 import com.facebook.react.modules.core.ExceptionsManagerModule;
@@ -56,6 +57,7 @@
       SourceCodeModule.class,
       TimingModule.class,
       UIManagerModule.class,
+      NativeDevSplitBundleLoaderModule.class,
     })
 public class CoreModulesPackage extends TurboReactPackage implements ReactPackageLogger {
 
@@ -101,7 +103,8 @@ public ReactModuleInfoProvider getReactModuleInfoProvider() {
             HeadlessJsTaskSupportModule.class,
             SourceCodeModule.class,
             TimingModule.class,
-            UIManagerModule.class
+            UIManagerModule.class,
+            NativeDevSplitBundleLoaderModule.class,
           };
 
       final Map<String, ReactModuleInfo> reactModuleInfoMap = new HashMap<>();
@@ -158,6 +161,9 @@ public NativeModule getModule(String name, ReactApplicationContext reactContext)
         return createUIManager(reactContext);
       case DeviceInfoModule.NAME:
         return new DeviceInfoModule(reactContext);
+      case NativeDevSplitBundleLoaderModule.NAME:
+        return new NativeDevSplitBundleLoaderModule(
+            reactContext, mReactInstanceManager.getDevSupportManager());
       default:
         throw new IllegalArgumentException(
             "In CoreModulesPackage, could not find Native module for " + name);

ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstanceImpl.java

@@ -240,6 +240,11 @@ public void loadScriptFromFile(String fileName, String sourceURL, boolean loadSy
     jniLoadScriptFromFile(fileName, sourceURL, loadSynchronously);
   }
 
+  @Override
+  public void loadSplitBundleFromFile(String fileName, String sourceURL) {
+    jniLoadScriptFromFile(fileName, sourceURL, false);
+  }
+
   private native void jniSetSourceURL(String sourceURL);
 
   private native void jniRegisterSegment(int segmentId, String path);

ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoader.java

@@ -73,6 +73,25 @@ public String loadScript(JSBundleLoaderDelegate delegate) {
     };
   }
 
+  /**
+   * Same as {{@link JSBundleLoader#createCachedBundleFromNetworkLoader(String, String)}}, but for
+   * split bundles in development.
+   */
+  public static JSBundleLoader createCachedSplitBundleFromNetworkLoader(
+      final String sourceURL, final String cachedFileLocation) {
+    return new JSBundleLoader() {
+      @Override
+      public String loadScript(JSBundleLoaderDelegate delegate) {
+        try {
+          delegate.loadSplitBundleFromFile(cachedFileLocation, sourceURL);
+          return sourceURL;
+        } catch (Exception e) {
+          throw DebugServerException.makeGeneric(sourceURL, e.getMessage(), e);
+        }
+      }
+    };
+  }
+
   /**
    * This loader is used when proxy debugging is enabled. In that case there is no point in fetching
    * the bundle from device as remote executor will have to do it anyway.

ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoaderDelegate.java

@@ -33,6 +33,12 @@ public interface JSBundleLoaderDelegate {
    */
   void loadScriptFromFile(String fileName, String sourceURL, boolean loadSynchronously);
 
+  /**
+   * Load a split JS bundle from the filesystem. See {@link
+   * JSBundleLoader#createCachedSplitBundleFromNetworkLoader(String, String)}.
+   */
+  void loadSplitBundleFromFile(String fileName, String sourceURL);
+
   /**
    * This API is used in situations where the JS bundle is being executed not on the device, but on
    * a host machine. In that case, we must provide two source URLs for the JS bundle: One to be used

ReactAndroid/src/main/java/com/facebook/react/common/DebugServerException.java

@@ -40,16 +40,25 @@ public static DebugServerException makeGeneric(
     return new DebugServerException(reason + message + extra, t);
   }
 
+  private final String mOriginalMessage;
+
   private DebugServerException(String description, String fileName, int lineNumber, int column) {
     super(description + "\n  at " + fileName + ":" + lineNumber + ":" + column);
+    mOriginalMessage = description;
   }
 
   public DebugServerException(String description) {
     super(description);
+    mOriginalMessage = description;
   }
 
   public DebugServerException(String detailMessage, Throwable throwable) {
     super(detailMessage, throwable);
+    mOriginalMessage = detailMessage;
+  }
+
+  public String getOriginalMessage() {
+    return mOriginalMessage;
   }
 
   /**

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

@@ -107,10 +107,7 @@ public void downloadBundleFromURL(
       Request.Builder requestBuilder) {
 
     final Request request =
-        requestBuilder
-            .url(formatBundleUrl(bundleURL))
-            .addHeader("Accept", "multipart/mixed")
-            .build();
+        requestBuilder.url(bundleURL).addHeader("Accept", "multipart/mixed").build();
     mDownloadBundleFromURLCall = Assertions.assertNotNull(mClient.newCall(request));
     mDownloadBundleFromURLCall.enqueue(
         new Callback() {
@@ -165,10 +162,6 @@ public void onResponse(Call call, final Response response) throws IOException {
         });
   }
 
-  private String formatBundleUrl(String bundleURL) {
-    return bundleURL;
-  }
-
   private void processMultipartResponse(
       final String url,
       final Response response,

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

@@ -419,15 +419,26 @@ private boolean getJSMinifyMode() {
   }
 
   private String createBundleURL(String mainModuleID, BundleType type, String host) {
+    return createBundleURL(mainModuleID, type, host, false, true);
+  }
+
+  private String createSplitBundleURL(String mainModuleID, String host) {
+    return createBundleURL(mainModuleID, BundleType.BUNDLE, host, true, false);
+  }
+
+  private String createBundleURL(
+      String mainModuleID, BundleType type, String host, boolean modulesOnly, boolean runModule) {
     return String.format(
         Locale.US,
-        "http://%s/%s.%s?platform=android&dev=%s&minify=%s&app=%s",
+        "http://%s/%s.%s?platform=android&dev=%s&minify=%s&app=%s&modulesOnly=%s&runModule=%s",
         host,
         mainModuleID,
         type.typeID(),
         getDevMode(),
         getJSMinifyMode(),
-        mPackageName);
+        mPackageName,
+        modulesOnly ? "true" : "false",
+        runModule ? "true" : "false");
   }
 
   private String createBundleURL(String mainModuleID, BundleType type) {
@@ -454,6 +465,11 @@ public String getDevServerBundleURL(final String jsModulePath) {
         mSettings.getPackagerConnectionSettings().getDebugServerHost());
   }
 
+  public String getDevServerSplitBundleURL(String jsModulePath) {
+    return createSplitBundleURL(
+        jsModulePath, mSettings.getPackagerConnectionSettings().getDebugServerHost());
+  }
+
   public void isPackagerRunning(final PackagerStatusCallback callback) {
     String statusURL =
         createPackagerStatusURL(mSettings.getPackagerConnectionSettings().getDebugServerHost());