react-native/React/Base/RCTJavaScriptLoader.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.
*/
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#import "RCTJavaScriptLoader.h"
#import "RCTBridge.h"
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#import "RCTInvalidating.h"
#import "RCTLog.h"
#import "RCTRedBox.h"
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#import "RCTSourceCode.h"
#import "RCTUtils.h"
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#define NO_REMOTE_MODULE @"Could not fetch module bundle %@. Ensure node server is running.\n\nIf it timed out, try reloading."
#define NO_LOCAL_BUNDLE @"Could not load local bundle %@. Ensure file exists."
#define CACHE_DIR @"RCTJSBundleCache"
#pragma mark - Application Engine
/**
* TODO:
* - Add window resize rotation events matching the DOM API.
* - Device pixel ration hooks.
* - Source maps.
*/
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@implementation RCTJavaScriptLoader
{
__weak RCTBridge *_bridge;
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}
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/**
* `CADisplayLink` code copied from Ejecta but we've placed the JavaScriptCore
* engine in its own dedicated thread.
*
* TODO: Try adding to the `RCTJavaScriptExecutor`'s thread runloop. Removes one
* additional GCD dispatch per frame and likely makes it so that other UIThread
* operations don't delay the dispatch (so we can begin working in JS much
* faster.) Event handling must still be sent via a GCD dispatch, of course.
*
* We must add the display link to two runloops in order to get setTimeouts to
* fire during scrolling. (`NSDefaultRunLoopMode` and `UITrackingRunLoopMode`)
* TODO: We can invent a `requestAnimationFrame` and
* `requestAvailableAnimationFrame` to control if callbacks can be fired during
* an animation.
* http://stackoverflow.com/questions/12622800/why-does-uiscrollview-pause-my-cadisplaylink
*
*/
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- (instancetype)initWithBridge:(RCTBridge *)bridge
{
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if ((self = [super init])) {
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_bridge = bridge;
}
return self;
}
- (void)loadBundleAtURL:(NSURL *)scriptURL onComplete:(void (^)(NSError *))onComplete
{
if (scriptURL == nil) {
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NSError *error = [NSError errorWithDomain:@"JavaScriptLoader" code:1 userInfo:@{
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NSLocalizedDescriptionKey: @"No script URL provided"
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}];
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onComplete(error);
return;
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}
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if ([scriptURL isFileURL]) {
NSString *bundlePath = [[NSBundle bundleForClass:[self class]] resourcePath];
NSString *localPath = [scriptURL.absoluteString substringFromIndex:@"file://".length];
if (![localPath hasPrefix:bundlePath]) {
NSString *absolutePath = [NSString stringWithFormat:@"%@/%@", bundlePath, localPath];
scriptURL = [NSURL fileURLWithPath:absolutePath];
}
}
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NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithURL:scriptURL completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error) {
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// Handle general request errors
if (error) {
if ([[error domain] isEqualToString:NSURLErrorDomain]) {
NSString *desc = [@"Could not connect to development server. Ensure node server is running and available on the same network - run 'npm start' from react-native root\n\nURL: " stringByAppendingString:[scriptURL absoluteString]];
NSDictionary *userInfo = @{
NSLocalizedDescriptionKey: desc,
NSLocalizedFailureReasonErrorKey: [error localizedDescription],
NSUnderlyingErrorKey: error,
};
error = [NSError errorWithDomain:@"JSServer"
code:error.code
userInfo:userInfo];
}
onComplete(error);
return;
}
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// Parse response as text
NSStringEncoding encoding = NSUTF8StringEncoding;
if (response.textEncodingName != nil) {
CFStringEncoding cfEncoding = CFStringConvertIANACharSetNameToEncoding((CFStringRef)response.textEncodingName);
if (cfEncoding != kCFStringEncodingInvalidId) {
encoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding);
}
}
NSString *rawText = [[NSString alloc] initWithData:data encoding:encoding];
// Handle HTTP errors
if ([response isKindOfClass:[NSHTTPURLResponse class]] && [(NSHTTPURLResponse *)response statusCode] != 200) {
NSDictionary *userInfo;
NSDictionary *errorDetails = RCTJSONParse(rawText, nil);
if ([errorDetails isKindOfClass:[NSDictionary class]] &&
[errorDetails[@"errors"] isKindOfClass:[NSArray class]]) {
NSMutableArray *fakeStack = [[NSMutableArray alloc] init];
for (NSDictionary *err in errorDetails[@"errors"]) {
[fakeStack addObject: @{
@"methodName": err[@"description"] ?: @"",
@"file": err[@"filename"] ?: @"",
@"lineNumber": err[@"lineNumber"] ?: @0
}];
}
userInfo = @{
NSLocalizedDescriptionKey: errorDetails[@"message"] ?: @"No message provided",
@"stack": fakeStack,
};
} else {
userInfo = @{NSLocalizedDescriptionKey: rawText};
}
error = [NSError errorWithDomain:@"JSServer"
code:[(NSHTTPURLResponse *)response statusCode]
userInfo:userInfo];
onComplete(error);
return;
}
RCTSourceCode *sourceCodeModule = _bridge.modules[RCTBridgeModuleNameForClass([RCTSourceCode class])];
sourceCodeModule.scriptURL = scriptURL;
sourceCodeModule.scriptText = rawText;
[_bridge enqueueApplicationScript:rawText url:scriptURL onComplete:^(NSError *scriptError) {
dispatch_async(dispatch_get_main_queue(), ^{
onComplete(scriptError);
});
}];
}];
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[task resume];
}
@end