Do not crash if there is no disk, just return nil instance

Summary: This should not affect prod as flipper (also called sonar) should only be an internal debug product but i needed to fix it to start the app.

Reviewed By: jknoxville

Differential Revision: D10156590

fbshipit-source-id: 84a76e5cbe2f4bbe89627895efcfb7e6cdadae13

iOS/FlipperKit/FlipperClient.mm

@@ -36,7 +36,12 @@ using WrapperPlugin = facebook::flipper::FlipperCppWrapperPlugin;
   static FlipperClient *sharedClient = nil;
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
+    try {
       sharedClient = [[self alloc] init];
+    } catch (const std::exception &e) {
+      // fail.
+      sharedClient = nil;
+    }
   });
   return sharedClient;
 }
@@ -52,9 +57,9 @@ using WrapperPlugin = facebook::flipper::FlipperCppWrapperPlugin;
 
     NSFileManager *manager = [NSFileManager defaultManager];
 
-    if ([manager fileExistsAtPath:privateAppDirectory isDirectory:NULL] == NO) {
-      //TODO: Handle errors properly
-      [manager createDirectoryAtPath:privateAppDirectory withIntermediateDirectories:YES attributes:nil error:nil];
+    if ([manager fileExistsAtPath:privateAppDirectory isDirectory:NULL] == NO &&
+        ![manager createDirectoryAtPath:privateAppDirectory withIntermediateDirectories:YES attributes:nil error:nil]) {
+      return nil;
     }
 
 #if TARGET_OS_SIMULATOR
@@ -62,6 +67,7 @@ using WrapperPlugin = facebook::flipper::FlipperCppWrapperPlugin;
 #endif
 
     static const std::string UNKNOWN = std::string("unknown");
+    try {
       facebook::flipper::FlipperClient::init({
         {
           "localhost",
@@ -76,6 +82,10 @@ using WrapperPlugin = facebook::flipper::FlipperCppWrapperPlugin;
         connectionThread.getEventBase()
       });
       _cppClient = facebook::flipper::FlipperClient::instance();
+    } catch (const std::system_error &e) {
+      // Probably ran out of disk space.
+      return nil;
+    }
   }
   return self;
 }