[ReactNative] Add RCTBridgeDelegate

Summary:
Add a new bridge delegate protocol to allow a more flexible bridge configuration.

For now it just support the pre-existent configurations + providing the JavaScript
source to the bridge, that should allow pre-loading sources.

Examples/UIExplorer/UIExplorer/AppDelegate.m

@@ -14,13 +14,35 @@
 
 #import "AppDelegate.h"
 
+#import "RCTBridge.h"
+#import "RCTJavaScriptLoader.h"
 #import "RCTRootView.h"
 
+@interface AppDelegate() <RCTBridgeDelegate>
+
+@end
+
 @implementation AppDelegate
 
 - (BOOL)application:(__unused UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
-  NSURL *jsCodeLocation;
+  RCTBridge *bridge = [[RCTBridge alloc] initWithDelegate:self
+                                            launchOptions:launchOptions];
+
+  RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge
+                                                   moduleName:@"UIExplorerApp"];
+
+  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
+  UIViewController *rootViewController = [[UIViewController alloc] init];
+  rootViewController.view = rootView;
+  self.window.rootViewController = rootViewController;
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+- (NSURL *)sourceURLForBridge:(__unused RCTBridge *)bridge
+{
+    NSURL *sourceURL;
 
     /**
      * Loading JavaScript code - uncomment the one you want.
@@ -36,7 +58,7 @@
      * on the same Wi-Fi network.
      */
 
-  jsCodeLocation = [NSURL URLWithString:@"http://localhost:8081/Examples/UIExplorer/UIExplorerApp.ios.includeRequire.runModule.bundle?dev=true"];
+    sourceURL = [NSURL URLWithString:@"http://localhost:8081/Examples/UIExplorer/UIExplorerApp.ios.includeRequire.runModule.bundle?dev=true"];
 
     /**
      * OPTION 2
@@ -48,22 +70,20 @@
      * then add the `main.jsbundle` file to your project and uncomment this line:
      */
 
-//  jsCodeLocation = [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
+  //  sourceURL = [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
 
   #if RUNNING_ON_CI
-   jsCodeLocation = [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
+     sourceURL = [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
   #endif
 
-  RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
+  return sourceURL;
-                                                      moduleName:@"UIExplorerApp"
+}
-                                                   launchOptions:launchOptions];
 
-  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
+- (void)loadSourceForBridge:(RCTBridge *)bridge
-  UIViewController *rootViewController = [[UIViewController alloc] init];
+                  withBlock:(RCTSourceLoadBlock)loadCallback
-  rootViewController.view = rootView;
+{
-  self.window.rootViewController = rootViewController;
+  [RCTJavaScriptLoader loadBundleAtURL:[self sourceURLForBridge:bridge]
-  [self.window makeKeyAndVisible];
+                            onComplete:loadCallback];
-  return YES;
 }
 
 @end

Libraries/WebSocket/RCTWebSocketExecutor.m

@@ -149,7 +149,11 @@ RCT_EXPORT_MODULE()
 
 - (void)executeApplicationScript:(NSString *)script sourceURL:(NSURL *)URL onComplete:(RCTJavaScriptCompleteBlock)onComplete
 {
-  NSDictionary *message = @{@"method": @"executeApplicationScript", @"url": [URL absoluteString], @"inject": _injectedObjects};
+  NSDictionary *message = @{
+    @"method": @"executeApplicationScript",
+    @"url": RCTNullIfNil([URL absoluteString]),
+    @"inject": _injectedObjects,
+  };
   [self sendMessage:message waitForReply:^(NSError *error, NSDictionary *reply) {
     onComplete(error);
   }];

React/Base/RCTBatchedBridge.m

@@ -156,6 +156,11 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
   _parentBridge.bundleURL = bundleURL;
 }
 
+- (id<RCTBridgeDelegate>)delegate
+{
+  return _parentBridge.delegate;
+}
+
 - (BOOL)isLoading
 {
   return _loading;
@@ -172,7 +177,17 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
 
   // Register passed-in module instances
   NSMutableDictionary *preregisteredModules = [[NSMutableDictionary alloc] init];
-  for (id<RCTBridgeModule> module in self.moduleProvider ? self.moduleProvider() : nil) {
+
+  NSArray *extraModules = nil;
+  if (self.delegate) {
+    if ([self.delegate respondsToSelector:@selector(extraModulesForBridge:)]) {
+      extraModules = [self.delegate extraModulesForBridge:_parentBridge];
+    }
+  } else if (self.moduleProvider) {
+    extraModules = self.moduleProvider();
+  }
+
+  for (id<RCTBridgeModule> module in extraModules) {
     preregisteredModules[RCTBridgeModuleNameForClass([module class])] = module;
   }
 
@@ -261,7 +276,6 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
     }
   }];
 
-  NSURL *bundleURL = _parentBridge.bundleURL;
   if (_javaScriptExecutor == nil) {
 
     /**
@@ -270,24 +284,15 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
      */
     _loading = NO;
 
-  } else if (!bundleURL) {
-
-    // Allow testing without a script
-    dispatch_async(dispatch_get_main_queue(), ^{
-      _loading = NO;
-      [[NSNotificationCenter defaultCenter] postNotificationName:RCTJavaScriptDidLoadNotification
-                                                          object:_parentBridge
-                                                        userInfo:@{ @"bridge": self }];
-    });
   } else {
 
     [[NSNotificationCenter defaultCenter] postNotificationName:RCTJavaScriptWillStartLoadingNotification
                                                         object:self
                                                       userInfo:@{ @"bridge": self }];
-    RCTProfileBeginEvent();
     RCTPerformanceLoggerStart(RCTPLScriptDownload);
-    RCTJavaScriptLoader *loader = [[RCTJavaScriptLoader alloc] initWithBridge:self];
+    RCTProfileBeginEvent();
-    [loader loadBundleAtURL:bundleURL onComplete:^(NSError *error, NSString *script) {
+    NSURL *sourceURL = self.delegate ? [self.delegate sourceURLForBridge:_parentBridge] : self.bundleURL;
+    void (^loadCallback)(NSError *, NSString *) = ^(NSError *error, NSString *script) {
       RCTPerformanceLoggerEnd(RCTPLScriptDownload);
       RCTProfileEndEvent(@"JavaScript download", @"init,download", @[]);
 
@@ -306,7 +311,7 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
       });
 
       RCTSourceCode *sourceCodeModule = self.modules[RCTBridgeModuleNameForClass([RCTSourceCode class])];
-      sourceCodeModule.scriptURL = bundleURL;
+      sourceCodeModule.scriptURL = sourceURL;
       sourceCodeModule.scriptText = script;
       if (error) {
 
@@ -326,7 +331,7 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
 
       } else {
 
-        [self enqueueApplicationScript:script url:bundleURL onComplete:^(NSError *loadError) {
+        [self enqueueApplicationScript:script url:sourceURL onComplete:^(NSError *loadError) {
 
           if (loadError) {
             [[RCTRedBox sharedInstance] showError:loadError];
@@ -345,7 +350,22 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
                                                             userInfo:@{ @"bridge": self }];
         }];
       }
-    }];
+    };
+
+    if ([self.delegate respondsToSelector:@selector(loadSourceForBridge:withBlock:)]) {
+      [self.delegate loadSourceForBridge:_parentBridge withBlock:loadCallback];
+    } else if (sourceURL) {
+      [RCTJavaScriptLoader loadBundleAtURL:sourceURL
+                                onComplete:loadCallback];
+    } else {
+      // Allow testing without a script
+      dispatch_async(dispatch_get_main_queue(), ^{
+        _loading = NO;
+        [[NSNotificationCenter defaultCenter] postNotificationName:RCTJavaScriptDidLoadNotification
+                                                            object:_parentBridge
+                                                          userInfo:@{ @"bridge": self }];
+      });
+    }
   }
 }
 

React/Base/RCTBridge.h

@@ -9,6 +9,7 @@
 
 #import <UIKit/UIKit.h>
 
+#import "RCTBridgeDelegate.h"
 #import "RCTBridgeModule.h"
 #import "RCTDefines.h"
 #import "RCTFrameUpdate.h"
@@ -70,7 +71,22 @@ RCT_EXTERN NSString *RCTBridgeModuleNameForClass(Class bridgeModuleClass);
  */
 @interface RCTBridge : NSObject <RCTInvalidating>
 
+
 /**
+ * Creates a new bridge with a custom RCTBridgeDelegate.
+ *
+ * All the interaction with the JavaScript context should be done using the bridge
+ * instance of the RCTBridgeModules. Modules will be automatically instantiated
+ * using the default contructor, but you can optionally pass in an array of
+ * pre-initialized module instances if they require additional init parameters
+ * or configuration.
+ */
+- (instancetype)initWithDelegate:(id<RCTBridgeDelegate>)delegate
+                   launchOptions:(NSDictionary *)launchOptions NS_DESIGNATED_INITIALIZER;
+
+/**
+ * DEPRECATED: Use initWithDelegate:launchOptions: instead
+ *
  * The designated initializer. This creates a new bridge on top of the specified
  * executor. The bridge should then be used for all subsequent communication
  * with the JavaScript code running in the executor. Modules will be automatically
@@ -100,8 +116,17 @@ RCT_EXTERN NSString *RCTBridgeModuleNameForClass(Class bridgeModuleClass);
  */
 @property (nonatomic, strong) NSURL *bundleURL;
 
+/**
+ * The class of the executor currently being used *or* to be used after the next
+ * reload.
+ */
 @property (nonatomic, strong) Class executorClass;
 
+/**
+ * The delegate provided during the bridge initialization
+ */
+@property (nonatomic, weak, readonly) id<RCTBridgeDelegate> delegate;
+
 /**
  * The event dispatcher is a wrapper around -enqueueJSCall:args: that provides a
  * higher-level interface for sending UI events such as touches and text input.

React/Base/RCTBridge.m

@@ -137,6 +137,22 @@ dispatch_queue_t RCTJSThread;
   });
 }
 
+- (instancetype)initWithDelegate:(id<RCTBridgeDelegate>)delegate
+                   launchOptions:(NSDictionary *)launchOptions
+{
+  RCTAssertMainThread();
+
+  if ((self = [super init])) {
+    RCTPerformanceLoggerStart(RCTPLTTI);
+
+    _delegate = delegate;
+    _launchOptions = [launchOptions copy];
+    [self setUp];
+    [self bindKeys];
+  }
+  return self;
+}
+
 - (instancetype)initWithBundleURL:(NSURL *)bundleURL
                    moduleProvider:(RCTBridgeModuleProviderBlock)block
                     launchOptions:(NSDictionary *)launchOptions

React/Base/RCTBridgeDelegate.h

@@ -0,0 +1,23 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+typedef void (^RCTSourceLoadBlock)(NSError *error, NSString *source);
+
+@class RCTBridge;
+
+@protocol RCTBridgeDelegate <NSObject>
+
+- (NSURL *)sourceURLForBridge:(RCTBridge *)bridge;
+
+@optional
+
+- (NSArray *)extraModulesForBridge:(RCTBridge *)bridge;
+- (void)loadSourceForBridge:(RCTBridge *)bridge withBlock:(RCTSourceLoadBlock)loadCallback;
+
+@end

React/Base/RCTJavaScriptLoader.h

@@ -9,7 +9,7 @@
 
 #import <UIKit/UIKit.h>
 
-#import "RCTJavaScriptExecutor.h"
+#import "RCTBridgeDelegate.h"
 
 @class RCTBridge;
 
@@ -20,8 +20,6 @@
  */
 @interface RCTJavaScriptLoader : NSObject
 
-- (instancetype)initWithBridge:(RCTBridge *)bridge NS_DESIGNATED_INITIALIZER;
++ (void)loadBundleAtURL:(NSURL *)moduleURL onComplete:(RCTSourceLoadBlock)onComplete;
-
-- (void)loadBundleAtURL:(NSURL *)moduleURL onComplete:(void (^)(NSError *, NSString *))onComplete;
 
 @end

React/Base/RCTJavaScriptLoader.m

@@ -15,23 +15,10 @@
 #import "RCTUtils.h"
 
 @implementation RCTJavaScriptLoader
-{
-  __weak RCTBridge *_bridge;
-}
-
-- (instancetype)initWithBridge:(RCTBridge *)bridge
-{
-  RCTAssert(bridge, @"bridge parameter is required");
-
-  if ((self = [super init])) {
-    _bridge = bridge;
-  }
-  return self;
-}
 
 RCT_NOT_IMPLEMENTED(-init)
 
-- (void)loadBundleAtURL:(NSURL *)scriptURL onComplete:(void (^)(NSError *, NSString *))onComplete
++ (void)loadBundleAtURL:(NSURL *)scriptURL onComplete:(RCTSourceLoadBlock)onComplete
 {
   // Sanitize the script URL
   scriptURL = [RCTConvert NSURL:scriptURL.absoluteString];

React/React.xcodeproj/project.pbxproj

@@ -197,6 +197,7 @@
 		14435CE41AAC4AE100FC20F4 /* RCTMapManager.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTMapManager.m; sourceTree = "<group>"; };
 		146459241B06C49500B389AA /* RCTFPSGraph.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTFPSGraph.h; sourceTree = "<group>"; };
 		146459251B06C49500B389AA /* RCTFPSGraph.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTFPSGraph.m; sourceTree = "<group>"; };
+		1482F9E61B55B927000ADFF3 /* RCTBridgeDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = RCTBridgeDelegate.h; sourceTree = "<group>"; };
 		14C2CA6F1B3AC63800E6CBB2 /* RCTModuleMethod.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTModuleMethod.h; sourceTree = "<group>"; };
 		14C2CA701B3AC63800E6CBB2 /* RCTModuleMethod.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTModuleMethod.m; sourceTree = "<group>"; };
 		14C2CA721B3AC64300E6CBB2 /* RCTModuleData.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTModuleData.h; sourceTree = "<group>"; };
@@ -482,6 +483,7 @@
 				1345A83B1B265A0E00583190 /* RCTURLRequestHandler.h */,
 				83CBBA4F1A601E3B00E9B192 /* RCTUtils.h */,
 				83CBBA501A601E3B00E9B192 /* RCTUtils.m */,
+				1482F9E61B55B927000ADFF3 /* RCTBridgeDelegate.h */,
 			);
 			path = Base;
 			sourceTree = "<group>";