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react-native/React/Base/RCTBridge.m

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/**
* 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.
*/
#import "RCTBridge.h"
#import <dlfcn.h>
#import <objc/message.h>
#import <objc/runtime.h>
#import <mach-o/dyld.h>
#import <mach-o/getsect.h>
#import "RCTContextExecutor.h"
#import "RCTConvert.h"
#import "RCTEventDispatcher.h"
#import "RCTJavaScriptLoader.h"
#import "RCTKeyCommands.h"
#import "RCTLog.h"
#import "RCTRedBox.h"
#import "RCTRootView.h"
#import "RCTSparseArray.h"
#import "RCTUtils.h"
#import "RCTWebViewExecutor.h"
/**
* Must be kept in sync with `MessageQueue.js`.
*/
typedef NS_ENUM(NSUInteger, RCTBridgeFields) {
RCTBridgeFieldRequestModuleIDs = 0,
RCTBridgeFieldMethodIDs,
RCTBridgeFieldParamss,
RCTBridgeFieldResponseCBIDs,
RCTBridgeFieldResponseReturnValues,
RCTBridgeFieldFlushDateMillis
};
NSString *const RCTReloadBridge = @"RCTReloadBridge";
NSString *RCTBridgeModuleNameForClass(Class cls)
{
return [cls respondsToSelector:@selector(moduleName)] ? [cls moduleName] : NSStringFromClass(cls);
}
/**
* This function scans all classes available at runtime and returns an array
* of all JSMethods registered.
*/
static NSArray *RCTJSMethods(void)
{
static NSArray *JSMethods;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
NSMutableSet *uniqueMethods = [NSMutableSet set];
RCTEnumerateClasses(^(__unsafe_unretained Class cls) {
if (RCTClassOverridesClassMethod(cls, @selector(JSMethods))) {
[uniqueMethods addObjectsFromArray:[cls JSMethods]];
}
});
JSMethods = [uniqueMethods allObjects];
});
return JSMethods;
}
/**
* This function scans all classes available at runtime and returns an array
* of all classes that implement the RTCBridgeModule protocol.
*/
static NSArray *RCTModuleNamesByID;
static NSArray *RCTBridgeModuleClassesByModuleID(void)
{
static NSArray *modules;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
modules = [NSMutableArray array];
RCTModuleNamesByID = [NSMutableArray array];
RCTEnumerateClasses(^(__unsafe_unretained Class cls) {
if ([cls conformsToProtocol:@protocol(RCTBridgeModule)]) {
// Add module
[(NSMutableArray *)modules addObject:cls];
// Add module name
NSString *moduleName = RCTBridgeModuleNameForClass(cls);
[(NSMutableArray *)RCTModuleNamesByID addObject:moduleName];
}
});
modules = [modules copy];
RCTModuleNamesByID = [RCTModuleNamesByID copy];
});
return modules;
}
@interface RCTBridge ()
- (void)_invokeAndProcessModule:(NSString *)module
method:(NSString *)method
arguments:(NSArray *)args;
@end
/**
* This private class is used as a container for exported method info
*/
@interface RCTModuleMethod : NSObject
@property (nonatomic, copy, readonly) NSString *moduleClassName;
@property (nonatomic, copy, readonly) NSString *JSMethodName;
@end
@implementation RCTModuleMethod
{
BOOL _isClassMethod;
Class _moduleClass;
SEL _selector;
NSMethodSignature *_methodSignature;
NSArray *_argumentBlocks;
NSString *_methodName;
}
static Class _globalExecutorClass;
- (instancetype)initWithMethodName:(NSString *)methodName
JSMethodName:(NSString *)JSMethodName
{
if ((self = [super init])) {
_methodName = methodName;
NSArray *parts = [[methodName substringWithRange:NSMakeRange(2, methodName.length - 3)] componentsSeparatedByString:@" "];
// Parse class and method
_moduleClassName = parts[0];
NSRange categoryRange = [_moduleClassName rangeOfString:@"("];
if (categoryRange.length)
{
_moduleClassName = [_moduleClassName substringToIndex:categoryRange.location];
}
// Extract class and method details
_isClassMethod = [methodName characterAtIndex:0] == '+';
_moduleClass = NSClassFromString(_moduleClassName);
_selector = NSSelectorFromString(parts[1]);
_JSMethodName = JSMethodName ?: [NSStringFromSelector(_selector) componentsSeparatedByString:@":"][0];
#if DEBUG
// Sanity check
RCTAssert([_moduleClass conformsToProtocol:@protocol(RCTBridgeModule)],
@"You are attempting to export the method %@, but %@ does not \
conform to the RCTBridgeModule Protocol", methodName, _moduleClassName);
#endif
// Get method signature
_methodSignature = _isClassMethod ?
[_moduleClass methodSignatureForSelector:_selector] :
[_moduleClass instanceMethodSignatureForSelector:_selector];
// Process arguments
NSUInteger numberOfArguments = _methodSignature.numberOfArguments;
NSMutableArray *argumentBlocks = [[NSMutableArray alloc] initWithCapacity:numberOfArguments - 2];
for (NSUInteger i = 2; i < numberOfArguments; i++) {
const char *argumentType = [_methodSignature getArgumentTypeAtIndex:i];
switch (argumentType[0]) {
#define RCT_ARG_BLOCK(_logic) \
[argumentBlocks addObject:^(RCTBridge *bridge, NSInvocation *invocation, NSUInteger index, id json) { \
_logic \
[invocation setArgument:&value atIndex:index]; \
}]; \
#define RCT_CASE(_value, _class, _logic) \
case _value: { \
RCT_ARG_BLOCK( \
if (json && ![json isKindOfClass:[_class class]]) { \
RCTLogError(@"Argument %tu (%@) of %@.%@ should be of type %@", index, \
json, RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName, [_class class]); \
return; \
} \
_logic \
) \
break; \
}
RCT_CASE(':', NSString, SEL value = NSSelectorFromString(json); );
RCT_CASE('*', NSString, const char *value = [json UTF8String]; );
#define RCT_SIMPLE_CASE(_value, _type, _selector) \
case _value: { \
RCT_ARG_BLOCK( \
if (json && ![json respondsToSelector:@selector(_selector)]) { \
RCTLogError(@"Argument %tu (%@) of %@.%@ does not respond to selector: %@", \
index, json, RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName, @#_selector); \
return; \
} \
_type value = [json _selector]; \
) \
break; \
}
RCT_SIMPLE_CASE('c', char, charValue)
RCT_SIMPLE_CASE('C', unsigned char, unsignedCharValue)
RCT_SIMPLE_CASE('s', short, shortValue)
RCT_SIMPLE_CASE('S', unsigned short, unsignedShortValue)
RCT_SIMPLE_CASE('i', int, intValue)
RCT_SIMPLE_CASE('I', unsigned int, unsignedIntValue)
RCT_SIMPLE_CASE('l', long, longValue)
RCT_SIMPLE_CASE('L', unsigned long, unsignedLongValue)
RCT_SIMPLE_CASE('q', long long, longLongValue)
RCT_SIMPLE_CASE('Q', unsigned long long, unsignedLongLongValue)
RCT_SIMPLE_CASE('f', float, floatValue)
RCT_SIMPLE_CASE('d', double, doubleValue)
RCT_SIMPLE_CASE('B', BOOL, boolValue)
default: {
static const char *blockType = @encode(typeof(^{}));
if (!strcmp(argumentType, blockType)) {
RCT_ARG_BLOCK(
if (json && ![json isKindOfClass:[NSNumber class]]) {
RCTLogError(@"Argument %tu (%@) of %@.%@ should be a number", index,
json, RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName);
return;
}
// Marked as autoreleasing, because NSInvocation doesn't retain arguments
__autoreleasing id value = (json ? ^(NSArray *args) {
[bridge _invokeAndProcessModule:@"BatchedBridge"
method:@"invokeCallbackAndReturnFlushedQueue"
arguments:@[json, args]];
} : ^(NSArray *unused) {});
)
} else {
RCT_ARG_BLOCK( id value = json; )
}
break;
}
}
}
_argumentBlocks = [argumentBlocks copy];
}
return self;
}
- (void)invokeWithBridge:(RCTBridge *)bridge
module:(id)module
arguments:(NSArray *)arguments
{
#if DEBUG
// Sanity check
RCTAssert([module class] == _moduleClass, @"Attempted to invoke method \
%@ on a module of class %@", _methodName, [module class]);
#endif
// Safety check
if (arguments.count != _argumentBlocks.count) {
RCTLogError(@"%@.%@ was called with %zd arguments, but expects %zd",
RCTBridgeModuleNameForClass(_moduleClass), _JSMethodName,
arguments.count, _argumentBlocks.count);
return;
}
// Create invocation (we can't re-use this as it wouldn't be thread-safe)
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:_methodSignature];
[invocation setArgument:&_selector atIndex:1];
// Set arguments
NSUInteger index = 0;
for (id json in arguments) {
id arg = (json == [NSNull null]) ? nil : json;
void (^block)(RCTBridge *, NSInvocation *, NSUInteger, id) = _argumentBlocks[index];
block(bridge, invocation, index + 2, arg);
index ++;
}
// Invoke method
[invocation invokeWithTarget:_isClassMethod ? [module class] : module];
}
- (NSString *)description
{
return [NSString stringWithFormat:@"<%@: %p; exports %@ as %@;>", NSStringFromClass(self.class), self, _methodName, _JSMethodName];
}
@end
/**
* This function parses the exported methods inside RCTBridgeModules and
* generates an array of arrays of RCTModuleMethod objects, keyed
* by module index.
*/
static RCTSparseArray *RCTExportedMethodsByModuleID(void)
{
static RCTSparseArray *methodsByModuleID;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Dl_info info;
dladdr(&RCTExportedMethodsByModuleID, &info);
#ifdef __LP64__
typedef uint64_t RCTExportValue;
typedef struct section_64 RCTExportSection;
#define RCTGetSectByNameFromHeader getsectbynamefromheader_64
#else
typedef uint32_t RCTExportValue;
typedef struct section RCTExportSection;
#define RCTGetSectByNameFromHeader getsectbynamefromheader
#endif
const RCTExportValue mach_header = (RCTExportValue)info.dli_fbase;
const RCTExportSection *section = RCTGetSectByNameFromHeader((void *)mach_header, "__DATA", "RCTExport");
if (section == NULL) {
return;
}
NSArray *classes = RCTBridgeModuleClassesByModuleID();
NSMutableDictionary *methodsByModuleClassName = [NSMutableDictionary dictionaryWithCapacity:[classes count]];
for (RCTExportValue addr = section->offset;
addr < section->offset + section->size;
addr += sizeof(const char **) * 2) {
// Get data entry
const char **entries = (const char **)(mach_header + addr);
// Create method
RCTModuleMethod *moduleMethod =
[[RCTModuleMethod alloc] initWithMethodName:@(entries[0])
JSMethodName:strlen(entries[1]) ? @(entries[1]) : nil];
// Cache method
NSArray *methods = methodsByModuleClassName[moduleMethod.moduleClassName];
methodsByModuleClassName[moduleMethod.moduleClassName] =
methods ? [methods arrayByAddingObject:moduleMethod] : @[moduleMethod];
}
methodsByModuleID = [[RCTSparseArray alloc] initWithCapacity:[classes count]];
[classes enumerateObjectsUsingBlock:^(Class moduleClass, NSUInteger moduleID, BOOL *stop) {
methodsByModuleID[moduleID] = methodsByModuleClassName[NSStringFromClass(moduleClass)];
}];
});
return methodsByModuleID;
}
/**
* This constructs the remote modules configuration data structure,
* which represents the native modules and methods that will be called
* by JS. A numeric ID is assigned to each module and method, which will
* be used to communicate via the bridge. The structure of each
* module is as follows:
*
* "ModuleName1": {
* "moduleID": 0,
* "methods": {
* "methodName1": {
* "methodID": 0,
* "type": "remote"
* },
* "methodName2": {
* "methodID": 1,
* "type": "remote"
* },
* etc...
* },
* "constants": {
* ...
* }
* },
* etc...
*/
static NSDictionary *RCTRemoteModulesConfig(NSDictionary *modulesByName)
{
static NSMutableDictionary *remoteModuleConfigByClassName;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
remoteModuleConfigByClassName = [[NSMutableDictionary alloc] init];
[RCTBridgeModuleClassesByModuleID() enumerateObjectsUsingBlock:^(Class moduleClass, NSUInteger moduleID, BOOL *stop) {
NSArray *methods = RCTExportedMethodsByModuleID()[moduleID];
NSMutableDictionary *methodsByName = [NSMutableDictionary dictionaryWithCapacity:methods.count];
[methods enumerateObjectsUsingBlock:^(RCTModuleMethod *method, NSUInteger methodID, BOOL *_stop) {
methodsByName[method.JSMethodName] = @{
@"methodID": @(methodID),
@"type": @"remote",
};
}];
NSDictionary *module = @{
@"moduleID": @(moduleID),
@"methods": methodsByName
};
remoteModuleConfigByClassName[NSStringFromClass(moduleClass)] = module;
}];
});
// Create config
NSMutableDictionary *moduleConfig = [[NSMutableDictionary alloc] init];
[modulesByName enumerateKeysAndObjectsUsingBlock:^(NSString *moduleName, id<RCTBridgeModule> module, BOOL *stop) {
// Add constants
NSMutableDictionary *config = remoteModuleConfigByClassName[NSStringFromClass([module class])];
if ([module respondsToSelector:@selector(constantsToExport)]) {
NSDictionary *constants = [module constantsToExport];
if (constants) {
NSMutableDictionary *mutableConfig = [NSMutableDictionary dictionaryWithDictionary:config];
mutableConfig[@"constants"] = constants; // There's no real need to copy this
config = mutableConfig; // Nor this - receiver is unlikely to mutate it
}
}
moduleConfig[moduleName] = config;
}];
return moduleConfig;
}
/**
* As above, but for local modules/methods, which represent JS classes
* and methods that will be called by the native code via the bridge.
* Structure is essentially the same as for remote modules:
*
* "ModuleName1": {
* "moduleID": 0,
* "methods": {
* "methodName1": {
* "methodID": 0,
* "type": "local"
* },
* "methodName2": {
* "methodID": 1,
* "type": "local"
* },
* etc...
* }
* },
* etc...
*/
static NSMutableDictionary *RCTLocalModuleIDs;
static NSMutableDictionary *RCTLocalMethodIDs;
static NSDictionary *RCTLocalModulesConfig()
{
static NSMutableDictionary *localModules;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
RCTLocalModuleIDs = [[NSMutableDictionary alloc] init];
RCTLocalMethodIDs = [[NSMutableDictionary alloc] init];
localModules = [[NSMutableDictionary alloc] init];
for (NSString *moduleDotMethod in RCTJSMethods()) {
NSArray *parts = [moduleDotMethod componentsSeparatedByString:@"."];
RCTCAssert(parts.count == 2, @"'%@' is not a valid JS method definition - expected 'Module.method' format.", moduleDotMethod);
// Add module if it doesn't already exist
NSString *moduleName = parts[0];
NSDictionary *module = localModules[moduleName];
if (!module) {
module = @{
@"moduleID": @(localModules.count),
@"methods": [[NSMutableDictionary alloc] init]
};
localModules[moduleName] = module;
}
// Add method if it doesn't already exist
NSString *methodName = parts[1];
NSMutableDictionary *methods = module[@"methods"];
if (!methods[methodName]) {
methods[methodName] = @{
@"methodID": @(methods.count),
@"type": @"local"
};
}
// Add module and method lookup
RCTLocalModuleIDs[moduleDotMethod] = module[@"moduleID"];
RCTLocalMethodIDs[moduleDotMethod] = methods[methodName][@"methodID"];
}
});
return localModules;
}
@implementation RCTBridge
{
RCTSparseArray *_modulesByID;
NSDictionary *_modulesByName;
id<RCTJavaScriptExecutor> _javaScriptExecutor;
Class _executorClass;
NSString *_bundlePath;
NSDictionary *_launchOptions;
RCTBridgeModuleProviderBlock _moduleProvider;
BOOL _loaded;
}
static id<RCTJavaScriptExecutor> _latestJSExecutor;
- (instancetype)initWithBundlePath:(NSString *)bundlePath
moduleProvider:(RCTBridgeModuleProviderBlock)block
launchOptions:(NSDictionary *)launchOptions
{
if ((self = [super init])) {
_bundlePath = bundlePath;
_moduleProvider = block;
_launchOptions = launchOptions;
[self setUp];
[self bindKeys];
}
return self;
}
- (void)setUp
{
Class executorClass = _executorClass ?: _globalExecutorClass ?: [RCTContextExecutor class];
if ([NSStringFromClass(executorClass) isEqualToString:@"RCTWebViewExecutor"]) {
_javaScriptExecutor = [[RCTWebViewExecutor alloc] initWithWebView:[[UIWebView alloc] init]];
} else {
_javaScriptExecutor = [[executorClass alloc] init];
}
_latestJSExecutor = _javaScriptExecutor;
_eventDispatcher = [[RCTEventDispatcher alloc] initWithBridge:self];
_shadowQueue = dispatch_queue_create("com.facebook.ReactKit.ShadowQueue", DISPATCH_QUEUE_SERIAL);
// Register passed-in module instances
NSMutableDictionary *preregisteredModules = [[NSMutableDictionary alloc] init];
for (id<RCTBridgeModule> module in _moduleProvider ? _moduleProvider() : nil) {
preregisteredModules[RCTBridgeModuleNameForClass([module class])] = module;
}
// Instantiate modules
_modulesByID = [[RCTSparseArray alloc] init];
NSMutableDictionary *modulesByName = [preregisteredModules mutableCopy];
[RCTBridgeModuleClassesByModuleID() enumerateObjectsUsingBlock:^(Class moduleClass, NSUInteger moduleID, BOOL *stop) {
NSString *moduleName = RCTModuleNamesByID[moduleID];
// Check if module instance has already been registered for this name
if ((_modulesByID[moduleID] = modulesByName[moduleName])) {
// Preregistered instances takes precedence, no questions asked
if (!preregisteredModules[moduleName]) {
// It's OK to have a name collision as long as the second instance is nil
RCTAssert([[moduleClass alloc] init] == nil,
@"Attempted to register RCTBridgeModule class %@ for the name '%@', \
but name was already registered by class %@", moduleClass,
moduleName, [modulesByName[moduleName] class]);
}
} else {
// Module name hasn't been used before, so go ahead and instantiate
id<RCTBridgeModule> module = [[moduleClass alloc] init];
if (module) {
_modulesByID[moduleID] = modulesByName[moduleName] = module;
}
}
}];
// Store modules
_modulesByName = [modulesByName copy];
// Set bridge
for (id<RCTBridgeModule> module in _modulesByName.allValues) {
if ([module respondsToSelector:@selector(setBridge:)]) {
module.bridge = self;
}
}
// Inject module data into JS context
NSString *configJSON = RCTJSONStringify(@{
@"remoteModuleConfig": RCTRemoteModulesConfig(_modulesByName),
@"localModulesConfig": RCTLocalModulesConfig()
}, NULL);
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
[_javaScriptExecutor injectJSONText:configJSON asGlobalObjectNamed:@"__fbBatchedBridgeConfig" callback:^(id err) {
dispatch_semaphore_signal(semaphore);
}];
if (_javaScriptExecutor == nil) {
/**
* HACK (tadeu): If it failed to connect to the debugger, set loaded to true so we can
* reload
*/
_loaded = YES;
} else if (_bundlePath != nil) { // Allow testing without a script
RCTJavaScriptLoader *loader = [[RCTJavaScriptLoader alloc] initWithBridge:self];
[loader loadBundleAtURL:[NSURL URLWithString:_bundlePath]
onComplete:^(NSError *error) {
_loaded = YES;
if (error != nil) {
NSArray *stack = [[error userInfo] objectForKey:@"stack"];
if (stack) {
[[RCTRedBox sharedInstance] showErrorMessage:[error localizedDescription] withStack:stack];
} else {
[[RCTRedBox sharedInstance] showErrorMessage:[error localizedDescription] withDetails:[error localizedFailureReason]];
}
} else {
[[NSNotificationCenter defaultCenter] postNotificationName:RCTJavaScriptDidLoadNotification
object:self];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reload)
name:RCTReloadNotification
object:nil];
;
}
}];
}
}
- (void)bindKeys
{
#if TARGET_IPHONE_SIMULATOR
// Workaround around the first cmd+r not working: http://openradar.appspot.com/19613391
// You can register just the cmd key and do nothing. This will trigger the bug and cmd+r
// will work like a charm!
[[RCTKeyCommands sharedInstance] registerKeyCommandWithInput:@""
modifierFlags:UIKeyModifierCommand
action:^(UIKeyCommand *command) {
// Do nothing
}];
[[RCTKeyCommands sharedInstance] registerKeyCommandWithInput:@"r"
modifierFlags:UIKeyModifierCommand
action:^(UIKeyCommand *command) {
[self reload];
}];
[[RCTKeyCommands sharedInstance] registerKeyCommandWithInput:@"n"
modifierFlags:UIKeyModifierCommand
action:^(UIKeyCommand *command) {
_executorClass = Nil;
[self reload];
}];
[[RCTKeyCommands sharedInstance] registerKeyCommandWithInput:@"d"
modifierFlags:UIKeyModifierCommand
action:^(UIKeyCommand *command) {
_executorClass = NSClassFromString(@"RCTWebSocketExecutor");
if (!_executorClass) {
RCTLogError(@"WebSocket debugger is not available. Did you forget to include RCTWebSocketExecutor?");
}
[self reload];
}];
#endif
}
- (NSDictionary *)modules
{
RCTAssert(_modulesByName != nil, @"Bridge modules have not yet been initialized. \
You may be trying to access a module too early in the startup procedure.");
return _modulesByName;
}
- (void)dealloc
{
RCTAssert(!self.valid, @"must call -invalidate before -dealloc");
}
#pragma mark - RCTInvalidating
- (BOOL)isValid
{
return _javaScriptExecutor != nil;
}
- (void)invalidate
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
// Wait for queued methods to finish
dispatch_sync(self.shadowQueue, ^{
// Make sure all dispatchers have been executed before continuing
});
// Release executor
if (_latestJSExecutor == _javaScriptExecutor) {
_latestJSExecutor = nil;
}
[_javaScriptExecutor invalidate];
_javaScriptExecutor = nil;
// Invalidate modules
for (id target in _modulesByID.allObjects) {
if ([target respondsToSelector:@selector(invalidate)]) {
[(id<RCTInvalidating>)target invalidate];
}
}
// Release modules (breaks retain cycle if module has strong bridge reference)
_modulesByID = nil;
_modulesByName = nil;
_loaded = NO;
}
/**
* - TODO (#5906496): When we build a `MessageQueue.m`, handling all the requests could
* cause both a queue of "responses". We would flush them here. However, we
* currently just expect each objc block to handle its own response sending
* using a `RCTResponseSenderBlock`.
*/
#pragma mark - RCTBridge methods
/**
* Like JS::call, for objective-c.
*/
- (void)enqueueJSCall:(NSString *)moduleDotMethod args:(NSArray *)args
{
NSNumber *moduleID = RCTLocalModuleIDs[moduleDotMethod];
RCTAssert(moduleID != nil, @"Module '%@' not registered.",
[[moduleDotMethod componentsSeparatedByString:@"."] firstObject]);
NSNumber *methodID = RCTLocalMethodIDs[moduleDotMethod];
RCTAssert(methodID != nil, @"Method '%@' not registered.", moduleDotMethod);
if (self.loaded) {
[self _invokeAndProcessModule:@"BatchedBridge"
method:@"callFunctionReturnFlushedQueue"
arguments:@[moduleID, methodID, args ?: @[]]];
}
}
- (void)enqueueApplicationScript:(NSString *)script url:(NSURL *)url onComplete:(RCTJavaScriptCompleteBlock)onComplete
{
RCTAssert(onComplete != nil, @"onComplete block passed in should be non-nil");
[_javaScriptExecutor executeApplicationScript:script sourceURL:url onComplete:^(NSError *scriptLoadError) {
if (scriptLoadError) {
onComplete(scriptLoadError);
return;
}
[_javaScriptExecutor executeJSCall:@"BatchedBridge"
method:@"flushedQueue"
arguments:@[]
callback:^(id json, NSError *error) {
[self _handleBuffer:json];
onComplete(error);
}];
}];
}
#pragma mark - Payload Generation
- (void)_invokeAndProcessModule:(NSString *)module method:(NSString *)method arguments:(NSArray *)args
{
[[NSNotificationCenter defaultCenter] postNotificationName:@"JS_PERF_ENQUEUE" object:nil userInfo:nil];
RCTJavaScriptCallback processResponse = ^(id json, NSError *error) {
[[NSNotificationCenter defaultCenter] postNotificationName:@"JS_PERF_DEQUEUE" object:nil userInfo:nil];
[self _handleBuffer:json];
};
[_javaScriptExecutor executeJSCall:module
method:method
arguments:args
callback:processResponse];
}
#pragma mark - Payload Processing
- (void)_handleBuffer:(id)buffer
{
if (buffer == nil || buffer == (id)kCFNull) {
return;
}
if (![buffer isKindOfClass:[NSArray class]]) {
RCTLogError(@"Buffer must be an instance of NSArray, got %@", NSStringFromClass([buffer class]));
return;
}
NSArray *requestsArray = (NSArray *)buffer;
NSUInteger bufferRowCount = [requestsArray count];
NSUInteger expectedFieldsCount = RCTBridgeFieldResponseReturnValues + 1;
if (bufferRowCount != expectedFieldsCount) {
RCTLogError(@"Must pass all fields to buffer - expected %zd, saw %zd", expectedFieldsCount, bufferRowCount);
return;
}
for (NSUInteger fieldIndex = RCTBridgeFieldRequestModuleIDs; fieldIndex <= RCTBridgeFieldParamss; fieldIndex++) {
id field = [requestsArray objectAtIndex:fieldIndex];
if (![field isKindOfClass:[NSArray class]]) {
RCTLogError(@"Field at index %zd in buffer must be an instance of NSArray, got %@", fieldIndex, NSStringFromClass([field class]));
return;
}
}
NSArray *moduleIDs = requestsArray[RCTBridgeFieldRequestModuleIDs];
NSArray *methodIDs = requestsArray[RCTBridgeFieldMethodIDs];
NSArray *paramsArrays = requestsArray[RCTBridgeFieldParamss];
NSUInteger numRequests = [moduleIDs count];
BOOL allSame = numRequests == [methodIDs count] && numRequests == [paramsArrays count];
if (!allSame) {
RCTLogError(@"Invalid data message - all must be length: %zd", numRequests);
return;
}
for (NSUInteger i = 0; i < numRequests; i++) {
@autoreleasepool {
[self _handleRequestNumber:i
moduleID:[moduleIDs[i] integerValue]
methodID:[methodIDs[i] integerValue]
params:paramsArrays[i]];
}
}
// TODO: only used by RCTUIManager - can we eliminate this special case?
dispatch_async(self.shadowQueue, ^{
for (id module in _modulesByID.allObjects) {
if ([module respondsToSelector:@selector(batchDidComplete)]) {
[module batchDidComplete];
}
}
});
}
- (BOOL)_handleRequestNumber:(NSUInteger)i
moduleID:(NSUInteger)moduleID
methodID:(NSUInteger)methodID
params:(NSArray *)params
{
if (![params isKindOfClass:[NSArray class]]) {
RCTLogError(@"Invalid module/method/params tuple for request #%zd", i);
return NO;
}
// Look up method
NSArray *methods = RCTExportedMethodsByModuleID()[moduleID];
if (methodID >= methods.count) {
RCTLogError(@"Unknown methodID: %zd for module: %zd (%@)", methodID, moduleID, RCTModuleNamesByID[moduleID]);
return NO;
}
RCTModuleMethod *method = methods[methodID];
__weak RCTBridge *weakSelf = self;
dispatch_async(self.shadowQueue, ^{
__strong RCTBridge *strongSelf = weakSelf;
if (!strongSelf.isValid) {
// strongSelf has been invalidated since the dispatch_async call and this
// invocation should not continue.
return;
}
// Look up module
id module = strongSelf->_modulesByID[moduleID];
if (!module) {
RCTLogError(@"No module found for name '%@'", RCTModuleNamesByID[moduleID]);
return;
}
@try {
[method invokeWithBridge:strongSelf module:module arguments:params];
}
@catch (NSException *exception) {
RCTLogError(@"Exception thrown while invoking %@ on target %@ with params %@: %@", method.JSMethodName, module, params, exception);
}
});
return YES;
}
- (void)reload
{
if (_loaded) {
// If the bridge has not loaded yet, the context will be already invalid at
// the time the javascript gets executed.
// It will crash the javascript, and even the next `load` won't render.
[self invalidate];
[self setUp];
[[NSNotificationCenter defaultCenter] postNotificationName:RCTReloadViewsNotification
object:self];
}
}
+ (BOOL)hasValidJSExecutor
{
return (_latestJSExecutor != nil && [_latestJSExecutor isValid]);
}
+ (void)logMessage:(NSString *)message level:(NSString *)level
{
if (!_latestJSExecutor || ![_latestJSExecutor isValid]) {
RCTLogError(@"ERROR: No valid JS executor to log '%@'.", message);
return;
}
// Note: the js executor could get invalidated while we're trying to call
// this...need to watch out for that.
[_latestJSExecutor executeJSCall:@"RCTLog"
method:@"logIfNoNativeHook"
arguments:@[level, message]
callback:^(id json, NSError *error) {}];
}
@end
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