Redo error handling on iOS

Reviewed By: danzimm

Differential Revision: D5969343

fbshipit-source-id: 376984a6e959349260c54884c0b0b719f4c353d6

React/Base/RCTJSStackFrame.m

@@ -18,7 +18,7 @@ static NSRegularExpression *RCTJSStackFrameRegex()
   static NSRegularExpression *_regex;
   dispatch_once(&onceToken, ^{
     NSError *regexError;
-    _regex = [NSRegularExpression regularExpressionWithPattern:@"^([^@]+)@(.*):(\\d+):(\\d+)$" options:0 error:&regexError];
+    _regex = [NSRegularExpression regularExpressionWithPattern:@"^(?:([^@]+)@)?(.*):(\\d+):(\\d+)$" options:0 error:&regexError];
     if (regexError) {
       RCTLogError(@"Failed to build regex: %@", [regexError localizedDescription]);
     }
@@ -56,7 +56,9 @@ static NSRegularExpression *RCTJSStackFrameRegex()
     return nil;
   }
 
-  NSString *methodName = [line substringWithRange:[match rangeAtIndex:1]];
+  // methodName may not be present for e.g. anonymous functions
+  const NSRange methodNameRange = [match rangeAtIndex:1];
+  NSString *methodName = methodNameRange.location == NSNotFound ? nil : [line substringWithRange:methodNameRange];
   NSString *file = [line substringWithRange:[match rangeAtIndex:2]];
   NSString *lineNumber = [line substringWithRange:[match rangeAtIndex:3]];
   NSString *column = [line substringWithRange:[match rangeAtIndex:4]];
@@ -69,7 +71,7 @@ static NSRegularExpression *RCTJSStackFrameRegex()
 
 + (instancetype)stackFrameWithDictionary:(NSDictionary *)dict
 {
-  return [[self alloc] initWithMethodName:dict[@"methodName"]
+  return [[self alloc] initWithMethodName:RCTNilIfNull(dict[@"methodName"])
                                      file:dict[@"file"]
                                lineNumber:[RCTNilIfNull(dict[@"lineNumber"]) integerValue]
                                    column:[RCTNilIfNull(dict[@"column"]) integerValue]];

React/Base/RCTReloadCommand.h

@@ -17,3 +17,6 @@
 
 /** Registers a weakly-held observer of the Command+R reload key command. */
 RCT_EXTERN void RCTRegisterReloadCommandListener(id<RCTReloadListener> listener);
+
+/** Triggers a reload for all current listeners. You shouldn't need to use this directly in most cases. */
+RCT_EXTERN void RCTTriggerReloadCommandListeners(void);

React/Base/RCTReloadCommand.m

@@ -9,11 +9,15 @@
 
 #import "RCTReloadCommand.h"
 
+#import "RCTAssert.h"
 #import "RCTKeyCommands.h"
 
+/** main queue only */
+static NSHashTable<id<RCTReloadListener>> *listeners;
+
 void RCTRegisterReloadCommandListener(id<RCTReloadListener> listener)
 {
-  static NSHashTable<id<RCTReloadListener>> *listeners;
+  RCTAssertMainQueue(); // because registerKeyCommandWithInput: must be called on the main thread
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
     listeners = [NSHashTable weakObjectsHashTable];
@@ -21,17 +25,19 @@ void RCTRegisterReloadCommandListener(id<RCTReloadListener> listener)
                                                    modifierFlags:UIKeyModifierCommand
                                                           action:
      ^(__unused UIKeyCommand *command) {
-       NSArray<id<RCTReloadListener>> *copiedListeners;
-       @synchronized (listeners) { // avoid mutation-while-enumerating
-         copiedListeners = [listeners allObjects];
-       }
-       for (id<RCTReloadListener> l in copiedListeners) {
-         [l didReceiveReloadCommand];
-       }
+       RCTTriggerReloadCommandListeners();
      }];
   });
+  [listeners addObject:listener];
+}
 
-  @synchronized (listeners) {
-    [listeners addObject:listener];
+void RCTTriggerReloadCommandListeners(void)
+{
+  RCTAssertMainQueue();
+  // Copy to protect against mutation-during-enumeration.
+  // If listeners hasn't been initialized yet we get nil, which works just fine.
+  NSArray<id<RCTReloadListener>> *copiedListeners = [listeners allObjects];
+  for (id<RCTReloadListener> l in copiedListeners) {
+    [l didReceiveReloadCommand];
   }
 }

React/Modules/RCTRedBox.h

@@ -13,6 +13,8 @@
 #import <React/RCTBridgeModule.h>
 #import <React/RCTErrorCustomizer.h>
 
+@class RCTJSStackFrame;
+
 @interface RCTRedBox : NSObject <RCTBridgeModule>
 
 - (void)registerErrorCustomizer:(id<RCTErrorCustomizer>)errorCustomizer;
@@ -22,9 +24,17 @@
 - (void)showErrorMessage:(NSString *)message withRawStack:(NSString *)rawStack;
 - (void)showErrorMessage:(NSString *)message withStack:(NSArray<NSDictionary *> *)stack;
 - (void)updateErrorMessage:(NSString *)message withStack:(NSArray<NSDictionary *> *)stack;
+- (void)showErrorMessage:(NSString *)message withParsedStack:(NSArray<RCTJSStackFrame *> *)stack;
+- (void)updateErrorMessage:(NSString *)message withParsedStack:(NSArray<RCTJSStackFrame *> *)stack;
 
 - (void)dismiss;
 
+/** Overrides bridge.bundleURL. Modify on main thread only. You shouldn't need to use this. */
+@property (nonatomic, strong) NSURL *overrideBundleURL;
+
+/** Overrides the default behavior of calling [bridge reload] on reload. You shouldn't need to use this. */
+@property (nonatomic, strong) dispatch_block_t overrideReloadAction;
+
 @end
 
 /**

React/Modules/RCTRedBox.m

@@ -255,7 +255,7 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
     cell.selectedBackgroundView.backgroundColor = [UIColor colorWithWhite:0 alpha:0.2];
   }
 
-  cell.textLabel.text = stackFrame.methodName;
+  cell.textLabel.text = stackFrame.methodName ?: @"(unnamed method)";
   if (stackFrame.file) {
     cell.detailTextLabel.text = [self formatFrameSource:stackFrame];
   } else {
@@ -375,7 +375,7 @@ RCT_EXPORT_MODULE()
 
 - (void)showErrorMessage:(NSString *)message
 {
-  [self showErrorMessage:message withStack:nil isUpdate:NO];
+  [self showErrorMessage:message withParsedStack:nil isUpdate:NO];
 }
 
 - (void)showErrorMessage:(NSString *)message withDetails:(NSString *)details
@@ -383,36 +383,42 @@ RCT_EXPORT_MODULE()
   [self showErrorMessage:message withDetails:details stack:nil];
 }
 
-- (void)showErrorMessage:(NSString *)message withDetails:(NSString *)details stack:(NSArray<id> *)stack {
+- (void)showErrorMessage:(NSString *)message withDetails:(NSString *)details stack:(NSArray<RCTJSStackFrame *> *)stack {
   NSString *combinedMessage = message;
   if (details) {
     combinedMessage = [NSString stringWithFormat:@"%@\n\n%@", message, details];
   }
-  [self showErrorMessage:combinedMessage withStack:stack isUpdate:NO];
+  [self showErrorMessage:combinedMessage withParsedStack:stack isUpdate:NO];
 }
 
 - (void)showErrorMessage:(NSString *)message withRawStack:(NSString *)rawStack
 {
   NSArray<RCTJSStackFrame *> *stack = [RCTJSStackFrame stackFramesWithLines:rawStack];
-  [self showErrorMessage:message withStack:stack isUpdate:NO];
+  [self showErrorMessage:message withParsedStack:stack isUpdate:NO];
 }
 
-- (void)showErrorMessage:(NSString *)message withStack:(NSArray *)stack
+- (void)showErrorMessage:(NSString *)message withStack:(NSArray<NSDictionary *> *)stack
 {
-  [self showErrorMessage:message withStack:stack isUpdate:NO];
+  [self showErrorMessage:message withParsedStack:[RCTJSStackFrame stackFramesWithDictionaries:stack] isUpdate:NO];
 }
 
-- (void)updateErrorMessage:(NSString *)message withStack:(NSArray *)stack
+- (void)updateErrorMessage:(NSString *)message withStack:(NSArray<NSDictionary *> *)stack
 {
-  [self showErrorMessage:message withStack:stack isUpdate:YES];
+  [self showErrorMessage:message withParsedStack:[RCTJSStackFrame stackFramesWithDictionaries:stack] isUpdate:YES];
 }
 
-- (void)showErrorMessage:(NSString *)message withStack:(NSArray<id> *)stack isUpdate:(BOOL)isUpdate
+- (void)showErrorMessage:(NSString *)message withParsedStack:(NSArray<RCTJSStackFrame *> *)stack
 {
-  if (![[stack firstObject] isKindOfClass:[RCTJSStackFrame class]]) {
-    stack = [RCTJSStackFrame stackFramesWithDictionaries:stack];
-  }
+  [self showErrorMessage:message withParsedStack:stack isUpdate:NO];
+}
 
+- (void)updateErrorMessage:(NSString *)message withParsedStack:(NSArray<RCTJSStackFrame *> *)stack
+{
+  [self showErrorMessage:message withParsedStack:stack isUpdate:YES];
+}
+
+- (void)showErrorMessage:(NSString *)message withParsedStack:(NSArray<RCTJSStackFrame *> *)stack isUpdate:(BOOL)isUpdate
+{
   dispatch_async(dispatch_get_main_queue(), ^{
     if (!self->_window) {
       self->_window = [[RCTRedBoxWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
@@ -441,7 +447,8 @@ RCT_EXPORT_METHOD(dismiss)
 
 - (void)redBoxWindow:(__unused RCTRedBoxWindow *)redBoxWindow openStackFrameInEditor:(RCTJSStackFrame *)stackFrame
 {
-  if (![_bridge.bundleURL.scheme hasPrefix:@"http"]) {
+  NSURL *const bundleURL = _overrideBundleURL ?: _bridge.bundleURL;
+  if (![bundleURL.scheme hasPrefix:@"http"]) {
     RCTLogWarn(@"Cannot open stack frame in editor because you're not connected to the packager.");
     return;
   }
@@ -449,7 +456,7 @@ RCT_EXPORT_METHOD(dismiss)
   NSData *stackFrameJSON = [RCTJSONStringify([stackFrame toDictionary], NULL) dataUsingEncoding:NSUTF8StringEncoding];
   NSString *postLength = [NSString stringWithFormat:@"%tu", stackFrameJSON.length];
   NSMutableURLRequest *request = [NSMutableURLRequest new];
-  request.URL = [NSURL URLWithString:@"/open-stack-frame" relativeToURL:_bridge.bundleURL];
+  request.URL = [NSURL URLWithString:@"/open-stack-frame" relativeToURL:bundleURL];
   request.HTTPMethod = @"POST";
   request.HTTPBody = stackFrameJSON;
   [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
@@ -460,7 +467,11 @@ RCT_EXPORT_METHOD(dismiss)
 
 - (void)reloadFromRedBoxWindow:(__unused RCTRedBoxWindow *)redBoxWindow
 {
-  [_bridge reload];
+  if (_overrideReloadAction) {
+    _overrideReloadAction();
+  } else {
+    [_bridge reload];
+  }
   [self dismiss];
 }
 
@@ -487,6 +498,8 @@ RCT_EXPORT_METHOD(dismiss)
 - (void)showErrorMessage:(NSString *)message withRawStack:(NSString *)rawStack {}
 - (void)showErrorMessage:(NSString *)message withStack:(NSArray<NSDictionary *> *)stack {}
 - (void)updateErrorMessage:(NSString *)message withStack:(NSArray<NSDictionary *> *)stack {}
+- (void)showErrorMessage:(NSString *)message withParsedStack:(NSArray<RCTJSStackFrame *> *)stack {}
+- (void)updateErrorMessage:(NSString *)message withParsedStack:(NSArray<RCTJSStackFrame *> *)stack {}
 - (void)showErrorMessage:(NSString *)message withStack:(NSArray<NSDictionary *> *)stack isUpdate:(BOOL)isUpdate {}
 - (void)dismiss {}