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Type:
Bug
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Resolution: Fixed
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Priority:
Minor - P4
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None
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Affects Version/s: None
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Component/s: None
How frequently does the bug occur?
Sometimes
Description
I am building an iOS app using SwiftUI and Realm flexible sync. When launching the app with a user logged in, the following warning (twice the same, actually) at runtime sometimes appears:
> Publishing changes from background threads is not allowed; make sure to publish values from the main thread (via operators like receive(on
) on model updates.
from the Sync file on line:
public func receive<S>(subscriber: S) where S: Subscriber, S.Failure == Never, Output == S.Input { let token = user.subscribe { _ in _ = subscriber.receive(self.user) // <--- WARNING HERE } subscriber.receive(subscription: UserSubscription(user: user, token: token)) }
located in {{public class UserPublisher: Publisher }}
I am not getting this warning all the time, but from the below stacktrace it seems to be related to the user's token refresh. The stacktrace does not pinpoint to a specific place in my own code so I am not sure if that's an issue coming from my app or the SDK.
Stacktrace & log output
Unable to find source-code formatter for language: shell. Available languages are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go, groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc, perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml, yaml
Not getting any crash, but here is the stacktrace associated to the thread: #0 0x0000000000000000 in ___lldb_unnamed_symbol162166 () #1 0x0000000000000000 in ___lldb_unnamed_symbol162165 () #2 0x0000000000000000 in ___lldb_unnamed_symbol162185 () #3 0x0000000000000000 in ___lldb_unnamed_symbol186536 () #4 0x0000000000000000 in closure #1 in UserPublisher.receive<τ_0_0>(subscriber:) at /Users/******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-swift/RealmSwift/Sync.swift:969 #5 0x0000000000000000 in thunk for @escaping @callee_guaranteed (@guaranteed RLMUser) -> () () #6 0x0000000000000000 in auto -[RLMUser subscribe:]::$_3::operator()<realm::SyncUser const>(realm::SyncUser const&) const at /Users/******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-swift/Realm/RLMUser.mm:423 #7 0x0000000000000000 in decltype(static_cast<-[RLMUser subscribe:]::$_3&>(fp)(static_cast<realm::SyncUser const&>(fp0))) std::__1::__invoke<-[RLMUser subscribe:]::$_3&, realm::SyncUser const&>(-[RLMUser subscribe:]::$_3&, realm::SyncUser const&) at /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator16.2.sdk/usr/include/c++/v1/type_traits:3918 #8 0x0000000000000000 in void std::__1::__invoke_void_return_wrapper<void, true>::__call<-[RLMUser subscribe:]::$_3&, realm::SyncUser const&>(-[RLMUser subscribe:]::$_3&, realm::SyncUser const&) at /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator16.2.sdk/usr/include/c++/v1/__functional/invoke.h:61 #9 0x0000000000000000 in std::__1::__function::__alloc_func<-[RLMUser subscribe:]::$_3, std::__1::allocator<-[RLMUser subscribe:]::$_3>, void (realm::SyncUser const&)>::operator()(realm::SyncUser const&) at /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator16.2.sdk/usr/include/c++/v1/__functional/function.h:178 #10 0x0000000000000000 in std::__1::__function::__func<-[RLMUser subscribe:]::$_3, std::__1::allocator<-[RLMUser subscribe:]::$_3>, void (realm::SyncUser const&)>::operator()(realm::SyncUser const&) at /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator16.2.sdk/usr/include/c++/v1/__functional/function.h:352 #11 0x0000000000000000 in std::__1::__function::__value_func<void (realm::SyncUser const&)>::operator()(realm::SyncUser const&) const at /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator16.2.sdk/usr/include/c++/v1/__functional/function.h:505 #12 0x0000000000000000 in std::__1::function<void (realm::SyncUser const&)>::operator()(realm::SyncUser const&) const at /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator16.2.sdk/usr/include/c++/v1/__functional/function.h:1182 #13 0x0000000000000000 in realm::Subscribable<realm::SyncUser>::emit_change_to_subscribers(realm::SyncUser const&) const at /Users/*******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/object-store/sync/subscribable.hpp:149 #14 0x0000000000000000 in auto realm::SyncUser::refresh_custom_data(realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>)::$_9::operator()<std::__1::optional<realm::app::AppError> >(std::__1::optional<realm::app::AppError>) const at /Users/********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/object-store/sync/sync_user.cpp:510 #15 0x0000000000000000 in void realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>::call_regular_void<realm::SyncUser::refresh_custom_data(realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>)::$_9>(std::__1::integral_constant<bool, true>, realm::SyncUser::refresh_custom_data(realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>)::$_9&, std::__1::optional<realm::app::AppError>&&) at /Users*******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:148 #16 0x0000000000000000 in realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>::SpecificImpl<realm::SyncUser::refresh_custom_data(realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>)::$_9>::call(std::__1::optional<realm::app::AppError>&&) at /Users/*******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:168 #17 0x0000000000000000 in realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>::operator()(std::__1::optional<realm::app::AppError>) const at /Users/******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:94 #18 0x0000000000000000 in realm::app::App::refresh_access_token(std::__1::shared_ptr<realm::SyncUser> const&, realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>&&)::$_12::operator()(realm::app::Response const&) const at /Users/*********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/object-store/sync/app.cpp:1072 #19 0x0000000000000000 in void realm::util::UniqueFunction<void (realm::app::Response const&)>::call_regular_void<realm::app::App::refresh_access_token(std::__1::shared_ptr<realm::SyncUser> const&, realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>&&)::$_12>(std::__1::integral_constant<bool, true>, realm::app::App::refresh_access_token(std::__1::shared_ptr<realm::SyncUser> const&, realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>&&)::$_12&, realm::app::Response const&) at /Users/******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:148 #20 0x0000000000000000 in realm::util::UniqueFunction<void (realm::app::Response const&)>::SpecificImpl<realm::app::App::refresh_access_token(std::__1::shared_ptr<realm::SyncUser> const&, realm::util::UniqueFunction<void (std::__1::optional<realm::app::AppError>)>&&)::$_12>::call(realm::app::Response const&) at /Users/*****-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:168 #21 0x0000000000000000 in realm::util::UniqueFunction<void (realm::app::Response const&)>::operator()(realm::app::Response const&) const at /Users/********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:94 #22 0x0000000000000000 in realm::app::App::handle_possible_redirect_response(realm::app::Request&&, realm::app::Response const&, realm::util::UniqueFunction<void (realm::app::Response const&)>&&) at /Users/*******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/object-store/sync/app.cpp:938 #23 0x0000000000000000 in realm::app::App::do_request(realm::app::Request&&, realm::util::UniqueFunction<void (realm::app::Response const&)>&&)::$_9::operator()(realm::app::Request&&, realm::app::Response const&) at /Users/********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/object-store/sync/app.cpp:919 #24 0x0000000000000000 in void realm::util::UniqueFunction<void (realm::app::Request&&, realm::app::Response const&)>::call_regular_void<realm::app::App::do_request(realm::app::Request&&, realm::util::UniqueFunction<void (realm::app::Response const&)>&&)::$_9>(std::__1::integral_constant<bool, true>, realm::app::App::do_request(realm::app::Request&&, realm::util::UniqueFunction<void (realm::app::Response const&)>&&)::$_9&, realm::app::Request&&, realm::app::Response const&) at /Users/***********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:148 #25 0x0000000000000000 in realm::util::UniqueFunction<void (realm::app::Request&&, realm::app::Response const&)>::SpecificImpl<realm::app::App::do_request(realm::app::Request&&, realm::util::UniqueFunction<void (realm::app::Response const&)>&&)::$_9>::call(realm::app::Request&&, realm::app::Response const&) at /Users/*****-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:168 #26 0x0000000000000000 in realm::util::UniqueFunction<void (realm::app::Request&&, realm::app::Response const&)>::operator()(realm::app::Request&&, realm::app::Response const&) const at /Users/**********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:94 #27 0x0000000000000000 in realm::app::GenericNetworkTransport::send_request_to_server(realm::app::Request&&, realm::util::UniqueFunction<void (realm::app::Request&&, realm::app::Response const&)>&&)::'lambda'(realm::app::Response const&)::operator()(realm::app::Response const&) const at /Users/********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/object-store/sync/generic_network_transport.hpp:254 #28 0x0000000000000000 in void realm::util::UniqueFunction<void (realm::app::Response const&)>::call_regular_void<realm::app::GenericNetworkTransport::send_request_to_server(realm::app::Request&&, realm::util::UniqueFunction<void (realm::app::Request&&, realm::app::Response const&)>&&)::'lambda'(realm::app::Response const&)>(std::__1::integral_constant<bool, true>, realm::app::GenericNetworkTransport::send_request_to_server(realm::app::Request&&, realm::util::UniqueFunction<void (realm::app::Request&&, realm::app::Response const&)>&&)::'lambda'(realm::app::Response const&)&, realm::app::Response const&) at /Users/*******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:148 #29 0x0000000000000000 in realm::util::UniqueFunction<void (realm::app::Response const&)>::SpecificImpl<realm::app::GenericNetworkTransport::send_request_to_server(realm::app::Request&&, realm::util::UniqueFunction<void (realm::app::Request&&, realm::app::Response const&)>&&)::'lambda'(realm::app::Response const&)>::call(realm::app::Response const&) at /Users/*******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:168 #30 0x0000000000000000 in realm::util::UniqueFunction<void (realm::app::Response const&)>::operator()(realm::app::Response const&) const at /Users/*******-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-core/src/realm/util/functional.hpp:94 #31 0x0000000000000000 in invocation function for block in (anonymous namespace)::CocoaNetworkTransport::send_request_to_server(realm::app::Request const&, realm::util::UniqueFunction<void (realm::app::Response const&)>&&) at /Users/*********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-swift/Realm/RLMApp.mm:70 #32 0x0000000000000000 in -[RLMSessionDelegate URLSession:task:didCompleteWithError:] at /Users********-cghdayqxcodbycddurohdjmxfkbe/SourcePackages/checkouts/realm-swift/Realm/RLMNetworkTransport.mm:166 #33 0x0000000000000000 in ___lldb_unnamed_symbol2742 () #34 0x0000000000000000 in _dispatch_call_block_and_release () #35 0x0000000000000000 in _dispatch_client_callout () #36 0x0000000000000000 in _dispatch_lane_serial_drain () #37 0x0000000000000000 in _dispatch_lane_invoke () #38 0x0000000000000000 in _dispatch_workloop_worker_thread () #39 0x0000000000000000 in _pthread_wqthread () #40 0x0000000000000000 in start_wqthread ()
Can you reproduce the bug?
Sometimes
Reproduction Steps
No reproduction steps have been found yet. But it appears once after a while, coinciding with the SDK refreshing the user token.
Version
10.35.0
What Atlas Services are you using?
Both Atlas Device Sync and Atlas App Services
Are you using encryption?
No
Platform OS and version(s)
iOS 16.2, 16.3
Build environment
Xcode version: 14.2