[ECO-4982] Some groundwork for integrating room lifecycle manager #103
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WalkthroughThe pull request introduces several changes across multiple files, primarily focusing on the Changes
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (20)
Tests/AblyChatTests/Mocks/MockChannels.swift (1)
11-17: Consider improving error handling and documentation.The current implementation has a few areas for improvement:
- Using
fatalErrorin a mock can make tests brittle. Consider returning a new mock channel or throwing a custom error instead.- The unused
optionsparameter should be documented to explain why it's currently ignored and any future plans.- The error message could be more descriptive about available channels.
Consider this improvement:
+ /// Gets a mock channel by name + /// - Parameters: + /// - name: The name of the channel to retrieve + /// - options: Channel options (currently unused, preserved for protocol conformance) + /// - Returns: The mock channel + /// - Throws: MockChannelError if the channel is not found +enum MockChannelError: Error { + case channelNotFound(name: String, availableChannels: [String]) +} func get(_ name: String, options _: ARTRealtimeChannelOptions) -> MockRealtimeChannel { guard let channel = (channels.first { $0.name == name }) else { - fatalError("There is no mock channel with name \(name)") + throw MockChannelError.channelNotFound( + name: name, + availableChannels: channels.map(\.name) + ) } return channel }Sources/AblyChat/RoomFeature.swift (3)
9-11: Add documentation for the channel name format pattern.The method correctly implements the channel name generation, but it would benefit from documentation explaining the format pattern and its significance.
+ /// Generates a standardized channel name for a given room ID following the pattern: + /// `<roomId>::$chat::$<feature-specific-suffix>` + /// @param roomID The unique identifier for the room + /// @return A formatted channel name string internal func channelNameForRoomID(_ roomID: String) -> String {
13-26: Enhance documentation and error handling.While the implementation is solid, consider these improvements:
- Add spec references for all implemented features (typing, reactions) similar to the messages case
- Make the fatalError message more developer-friendly by suggesting next steps
private var channelNameSuffix: String { switch self { case .messages: // (CHA-M1) Chat messages for a Room are sent on a corresponding realtime channel <roomId>::$chat::$chatMessages. For example, if your room id is my-room then the messages channel will be my-room::$chat::$chatMessages. "chatMessages" case .typing: + // (Add spec reference here) "typingIndicators" case .reactions: + // (Add spec reference here) "reactions" case .presence, .occupancy: // We'll add these, with reference to the relevant spec points, as we implement these features - fatalError("Don't know channel name suffix for room feature \(self)") + fatalError(""" + Channel name suffix not implemented for \(self). + To implement: + 1. Refer to the relevant spec points + 2. Add the appropriate suffix string + 3. Remove this case from the fatalError block + """ + ) } }
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1-26: Well-structured foundation for room lifecycle management.The implementation provides a clean and extensible way to manage channel names across different room features. The enum-based approach with centralized channel name generation will make it easier to:
- Maintain consistency in channel naming across the SDK
- Add new room features in the future
- Track which features are implemented through the compile-time checks
Consider creating a separate documentation file or wiki page that lists all the channel naming conventions and their corresponding spec points. This would help maintain a single source of truth for the naming patterns.
Sources/AblyChat/AblyCocoaExtensions/Ably+Concurrency.swift (1)
Line range hint
3-4: Track the TODO dependencyThe comment indicates this is temporary code pending improvements in ably-cocoa (issue #1967). Consider:
- Adding a link to this PR in the ably-cocoa issue for tracking
- Creating a follow-up task to remove this code once ably-cocoa is updated
Would you like me to help create a GitHub issue to track the removal of this temporary code once ably-cocoa is updated?
Sources/AblyChat/Dependencies.swift (2)
17-17: Consider updating the comment to explain the rationale.The comment references an issue (#1968) but doesn't explain why this function is necessary or how it differs from the base protocol. Consider adding more context about its purpose and relationship to channel options.
- // It's not clear to me why ARTRealtimeChannelsProtocol doesn't include this function (https://github.com/ably/ably-cocoa/issues/1968). + // This function extends ARTRealtimeChannelsProtocol to support channel options, which is required for proper room lifecycle management. + // See: https://github.com/ably/ably-cocoa/issues/1968
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24-37: Consider enhancing documentation and edge case handling.While the implementation correctly merges channel options, it would benefit from:
- Documentation explaining the merging behavior and parameter precedence
- Explicit handling of nil params in defaultChannelOptions
Consider adding documentation and nil handling:
internal extension RealtimeClientProtocol { - // Function to get the channel with merged options + /// Gets a channel with merged options from both the provided options and defaultChannelOptions. + /// - Parameters: + /// - name: The channel name + /// - opts: Optional channel options that take precedence over defaultChannelOptions + /// - Returns: A channel configured with the merged options func getChannel(_ name: String, opts: ARTRealtimeChannelOptions? = nil) -> any RealtimeChannelProtocol { // Merge opts and defaultChannelOptions let resolvedOptions = opts ?? ARTRealtimeChannelOptions() - // Merge params if available, using defaultChannelOptions as fallback - resolvedOptions.params = opts?.params?.merging( - defaultChannelOptions.params ?? [:] - ) { _, new in new } + // Merge params if either source has them + if let optsParams = opts?.params, let defaultParams = defaultChannelOptions.params { + resolvedOptions.params = optsParams.merging(defaultParams) { new, _ in new } + } else { + resolvedOptions.params = opts?.params ?? defaultChannelOptions.params + } // Return the resolved channel return channels.get(name, options: resolvedOptions) } }Tests/AblyChatTests/DefaultMessagesTests.swift (3)
11-14: Consider extracting test setup into a helper method.The test setup pattern is repeated across multiple tests. Consider creating a helper method to reduce code duplication:
private func createDefaultMessages( channel: MockRealtimeChannel = MockRealtimeChannel(), realtimeResponse: MockHTTPPaginatedResponse? = nil ) async -> DefaultMessages { let realtime = realtimeResponse.map { MockRealtime.create { ($0, nil) } } ?? MockRealtime.create() let chatAPI = ChatAPI(realtime: realtime) return await DefaultMessages(channel: channel, chatAPI: chatAPI, roomID: "basketball", clientID: "clientId") }
28-31: Improve test name and document iOS compatibility requirement.The test name
get_getMessagesIsExposedFromChatAPIcould be more descriptive about the actual behavior being tested. Also, the iOS 16 compatibility workaround should be documented more clearly.Consider renaming the test to something like:
func get_successfullyRetrievesMessagesFromChatAPI()Also, add a more detailed comment about the iOS compatibility:
// Note: The `_ =` assignment is a workaround for iOS < 16 compatibility // due to limited runtime support for parameterized protocol types
47-55: Improve test clarity and consider splitting test cases.The test setup uses magic values and tests multiple behaviors in a single test case.
- Define constants for the serial values:
private enum TestConstants { static let defaultAttachSerial = "001" static let defaultChannelSerial = "001" }
- Consider splitting into separate test cases:
- One for subscription creation
- One for message pagination
- Use a more descriptive builder pattern for channel properties:
extension MockRealtimeChannel { static func withSerials( attach: String = TestConstants.defaultAttachSerial, channel: String = TestConstants.defaultChannelSerial ) -> MockRealtimeChannel { return MockRealtimeChannel( properties: .init( attachSerial: attach, channelSerial: channel ) ) } }Tests/AblyChatTests/DefaultRoomsTests.swift (2)
10-14: LGTM! Consider documenting the channel naming pattern.The addition of typing indicators and reactions channels aligns well with the room lifecycle management integration. The channel naming follows a consistent pattern.
Consider adding a comment explaining the channel naming pattern (
roomId::$chat::$feature) to help future maintainers understand the structure.
33-37: Consider extracting the MockRealtime initialization into a helper method.The initialization code is duplicated across all test methods. Consider extracting it into a helper method to improve maintainability.
+private extension DefaultRoomsTests { + static func createMockRealtime(roomId: String = "basketball") -> MockRealtime { + MockRealtime.create(channels: .init(channels: [ + .init(name: "\(roomId)::$chat::$chatMessages"), + .init(name: "\(roomId)::$chat::$typingIndicators"), + .init(name: "\(roomId)::$chat::$reactions"), + ])) + } +}Then use it in the test methods:
-let realtime = MockRealtime.create(channels: .init(channels: [ - .init(name: "basketball::$chat::$chatMessages"), - .init(name: "basketball::$chat::$typingIndicators"), - .init(name: "basketball::$chat::$reactions"), -])) +let realtime = Self.createMockRealtime()Sources/AblyChat/Room.swift (5)
42-44: Well-structured channel management implementation!The new
channelsdictionary provides a clean and type-safe way to manage feature-specific channels. This encapsulation will make it easier to integrate the room lifecycle manager.Consider adding documentation comments explaining the relationship between RoomFeature and channels, especially for future maintainers who will work with the lifecycle manager integration.
Also applies to: 67-68
77-82: Consider adding error handling for channel creation.While the channel creation logic is clean and functional, it might benefit from explicit error handling in case channel creation fails.
Consider wrapping the channel creation in a do-catch block:
private static func createChannels(roomID: String, realtime: RealtimeClient) -> [RoomFeature: RealtimeChannelProtocol] { - .init(uniqueKeysWithValues: [RoomFeature.messages, RoomFeature.typing, RoomFeature.reactions].map { feature in - let channel = realtime.getChannel(feature.channelNameForRoomID(roomID)) - return (feature, channel) - }) + .init(uniqueKeysWithValues: [RoomFeature.messages, RoomFeature.typing, RoomFeature.reactions].compactMap { feature in + do { + let channel = realtime.getChannel(feature.channelNameForRoomID(roomID)) + return (feature, channel) + } catch { + assertionFailure("Failed to create channel for feature \(feature): \(error)") + return nil + } + }) }
70-73: Consider safer channel access in messages initialization.While the force unwrap is guaranteed by
createChannels, it's better to be explicit about this guarantee.Consider using a guard or precondition:
- messages = await DefaultMessages( - channel: channels[.messages]!, + guard let messagesChannel = channels[.messages] else { + preconditionFailure("Messages channel must be available after initialization") + } + messages = await DefaultMessages( + channel: messagesChannel, chatAPI: chatAPI, roomID: roomID, clientID: clientId )
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101-108: Consider atomic attach/detach operations.Currently, if one channel fails to attach/detach, the error is thrown but previous successful operations aren't rolled back. This could leave the room in an inconsistent state.
Consider implementing atomic operations:
public func attach() async throws { + var attachedChannels: [RealtimeChannelProtocol] = [] for channel in channels.map(\.value) { do { try await channel.attachAsync() + attachedChannels.append(channel) } catch { + // Rollback previously attached channels + for attachedChannel in attachedChannels { + try? await attachedChannel.detachAsync() + } logger.log(message: "Failed to attach channel \(channel), error \(error)", level: .error) throw error } } transition(to: .attached) }Similar pattern should be applied to the
detachmethod.Also applies to: 113-120
42-44: Consider documenting lifecycle management integration points.As this PR lays groundwork for the room lifecycle manager, it would be valuable to add documentation comments describing how the channel management structure will interact with the upcoming lifecycle manager.
Consider adding:
- Documentation about the lifecycle states and their impact on channels
- Integration points where the lifecycle manager will hook into channel operations
- Expected behavior during lifecycle transitions
Tests/AblyChatTests/DefaultRoomTests.swift (2)
8-9: Document the CHA-M1 specification reference.The
@spec CHA-M1annotation should be documented to explain what specification or requirement it refers to. This helps other developers understand the test's purpose and traceability.
10-23: Consider expanding test coverage for channel naming patterns.While the test verifies the messages channel name, consider adding assertions for the other channel names (
typingIndicatorsandreactions) to ensure the complete channel naming pattern is validated.Example addition:
#expect(room.messages.channel.name == "basketball::$chat::$chatMessages") +#expect(room.typingIndicators.channel.name == "basketball::$chat::$typingIndicators") +#expect(room.reactions.channel.name == "basketball::$chat::$reactions")Sources/AblyChat/DefaultMessages.swift (1)
24-24: Re-evaluate the usage of 'nonisolated' on the initializerDeclaring the initializer as
nonisolatedallows it to be called from any context without actor isolation. Ensure this is intentional and that initializing properties from non-isolated contexts does not introduce thread safety issues, especially when assigning to properties that are part of the actor's isolated state.If actor isolation is required during initialization, consider removing
nonisolated:-internal nonisolated init(channel: RealtimeChannelProtocol, chatAPI: ChatAPI, roomID: String, clientID: String) async { +internal init(channel: RealtimeChannelProtocol, chatAPI: ChatAPI, roomID: String, clientID: String) async {
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Example/AblyChatExample/Mocks/MockRealtime.swift(0 hunks)Sources/AblyChat/AblyCocoaExtensions/Ably+Concurrency.swift(1 hunks)Sources/AblyChat/ChatAPI.swift(0 hunks)Sources/AblyChat/DefaultMessages.swift(1 hunks)Sources/AblyChat/Dependencies.swift(1 hunks)Sources/AblyChat/Room.swift(4 hunks)Sources/AblyChat/RoomFeature.swift(1 hunks)Tests/AblyChatTests/ChatAPITests.swift(0 hunks)Tests/AblyChatTests/DefaultMessagesTests.swift(3 hunks)Tests/AblyChatTests/DefaultRoomTests.swift(2 hunks)Tests/AblyChatTests/DefaultRoomsTests.swift(3 hunks)Tests/AblyChatTests/Mocks/MockChannels.swift(1 hunks)
💤 Files with no reviewable changes (3)
- Example/AblyChatExample/Mocks/MockRealtime.swift
- Sources/AblyChat/ChatAPI.swift
- Tests/AblyChatTests/ChatAPITests.swift
🔇 Additional comments (6)
Sources/AblyChat/AblyCocoaExtensions/Ably+Concurrency.swift (1)
7-16: Verify error handling in consuming code
The change in error handling pattern (from throws to Result) might affect consuming code. Ensure all callers are updated accordingly.
✅ Verification successful
No error handling changes needed - implementation maintains throws pattern
The verification shows that attachAsync() maintains its throws signature and the caller in Room.swift correctly handles it with a standard try-catch block. The internal use of Result is just an implementation detail of the async/await wrapper and doesn't affect the public error handling pattern.
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Sources/AblyChat/Dependencies.swift (1)
17-17: Verify impact of removing the single-parameter get method.
The removal of get(_ name: String) is a breaking change that requires all channel retrievals to specify options. This aligns with the room lifecycle manager integration but needs careful verification.
Let's check for any remaining usage of the single-parameter version:
✅ Verification successful
Breaking change impact is properly handled
The codebase shows a well-managed transition:
- The two-parameter
get(name:options:)is consistently used across the codebase - All mock implementations and interfaces properly reflect the required options parameter
- A convenience method
getChannel(_:opts:)with default options is provided for backward compatibility
The comment about ARTRealtimeChannelsProtocol missing this function appears to be a separate issue tracked in the Ably SDK (#1968) and doesn't affect this implementation.
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Tests/AblyChatTests/DefaultMessagesTests.swift (1)
Line range hint 1-71: Verify test coverage after removal of channel name verification.
The AI summary indicates that init_channelNameIsSetAsMessagesChannelName test was removed. We should verify if this functionality is still relevant and tested elsewhere.
Tests/AblyChatTests/DefaultRoomsTests.swift (2)
55-59: LGTM! Changes maintain consistency with other test methods.
The initialization changes align with the previous test methods and properly support the error handling test case.
Line range hint 1-82: Verify test coverage for all room features.
Let's ensure we're testing all available room features.
✅ Verification successful
The previous search for protocol features didn't yield results, so let's try a broader search to understand the feature implementations and channel structure in the source code. This will help us verify if all features are properly covered in the tests.
Based on the code analysis, I can now generate the final response regarding test coverage for room features.
All room features are properly covered in the test setup
The test coverage aligns with the implemented room features as defined in RoomFeature.swift:
- Messages (chatMessages)
- Typing indicators (typingIndicators)
- Reactions (reactions)
The other features (presence, occupancy) are not yet implemented as evidenced by the fatalError in their channel name suffix implementation, so they don't require test coverage at this stage.
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Tests/AblyChatTests/DefaultRoomTests.swift (1)
Line range hint 156-164: LGTM! Clear and consistent method rename.
The rename from current_startsAsInitialized() to status_startsAsInitialized() better reflects the property being tested and aligns with the room lifecycle management focus.
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (5)
Sources/AblyChat/Room.swift (2)
42-44: LGTM! Well-structured channel management approach.The new
channelsdictionary provides a clean and type-safe way to manage feature-specific channels. This encapsulation will make room lifecycle management more maintainable.Consider documenting the relationship between
RoomFeatureand channels in the property documentation, as this is a core architectural decision.Also applies to: 67-68
Line range hint
101-108: Consider enhancing error handling for partial failures.The current implementation throws on first channel failure, leaving other channels in an inconsistent state. Consider implementing rollback or partial success handling.
Here's a more robust approach for attach (similar pattern for detach):
public func attach() async throws { var attachedChannels: [RealtimeChannelProtocol] = [] do { for channel in channels.map(\.value) { do { try await channel.attachAsync() attachedChannels.append(channel) } catch { logger.log(message: "Failed to attach channel \(channel), error \(error)", level: .error) // Attempt to detach successfully attached channels for attachedChannel in attachedChannels { try? await attachedChannel.detachAsync() } throw error } } transition(to: .attached) } catch { transition(to: .failed) throw error } }Also applies to: 113-120
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (2)
1176-1180: Consider extracting the initial status to a constant.The hardcoded status value
.initializedcould be extracted to a constant or helper method to improve maintainability and reusability across test cases.+private static let arbitraryNoOperationStatus: DefaultRoomLifecycleManager<MockRoomLifecycleContributor>.Status = .initialized + // Given: A DefaultRoomLifecycleManager, with no operation in progress, with a transient disconnect timeout let contributor = createContributor() let sleepOperation = SignallableSleepOperation() let clock = MockSimpleClock(sleepBehavior: sleepOperation.behavior) -let initialManagerStatus = DefaultRoomLifecycleManager<MockRoomLifecycleContributor>.Status.initialized // arbitrary no-operation-in-progress +let initialManagerStatus = Self.arbitraryNoOperationStatus
1254-1260: Consider extracting the initial status to a constant.Similar to the previous comment, the hardcoded status value
.detachedcould be extracted to improve maintainability.+private static let arbitraryNonAttachedStatus: DefaultRoomLifecycleManager<MockRoomLifecycleContributor>.Status = .detached + let contributors = [ createContributor(initialState: .attached), createContributor(initialState: .detached), ] -let initialManagerStatus = DefaultRoomLifecycleManager<MockRoomLifecycleContributor>.Status.detached // arbitrary non-ATTACHED, no-operation-in-progress +let initialManagerStatus = Self.arbitraryNonAttachedStatusSources/AblyChat/RoomLifecycleManager.swift (1)
588-588: Document concurrency handling due to lack of enforced mutual exclusionSince
DefaultRoomLifecycleManagerdoes not enforce mutual exclusion for operations, it's crucial to ensure that concurrent operations manage synchronization appropriately. Consider adding detailed documentation or safeguards to prevent potential race conditions.
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Example/AblyChatExample/Mocks/MockRealtime.swift(0 hunks)Sources/AblyChat/AblyCocoaExtensions/Ably+Concurrency.swift(1 hunks)Sources/AblyChat/ChatAPI.swift(0 hunks)Sources/AblyChat/DefaultMessages.swift(1 hunks)Sources/AblyChat/Dependencies.swift(1 hunks)Sources/AblyChat/Room.swift(4 hunks)Sources/AblyChat/RoomFeature.swift(1 hunks)Sources/AblyChat/RoomLifecycleManager.swift(2 hunks)Tests/AblyChatTests/ChatAPITests.swift(0 hunks)Tests/AblyChatTests/DefaultMessagesTests.swift(3 hunks)Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift(40 hunks)Tests/AblyChatTests/DefaultRoomTests.swift(2 hunks)Tests/AblyChatTests/DefaultRoomsTests.swift(3 hunks)Tests/AblyChatTests/Mocks/MockChannels.swift(1 hunks)
💤 Files with no reviewable changes (3)
- Example/AblyChatExample/Mocks/MockRealtime.swift
- Sources/AblyChat/ChatAPI.swift
- Tests/AblyChatTests/ChatAPITests.swift
🚧 Files skipped from review as they are similar to previous changes (7)
- Sources/AblyChat/AblyCocoaExtensions/Ably+Concurrency.swift
- Sources/AblyChat/Dependencies.swift
- Sources/AblyChat/RoomFeature.swift
- Tests/AblyChatTests/DefaultMessagesTests.swift
- Tests/AblyChatTests/DefaultRoomTests.swift
- Tests/AblyChatTests/DefaultRoomsTests.swift
- Tests/AblyChatTests/Mocks/MockChannels.swift
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📓 Learnings (1)
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (2)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Tests/AblyChatTests/RoomLifecycleManagerTests.swift:335-335
Timestamp: 2024-09-23T19:56:39.435Z
Learning: In Swift Testing, test method names do not need to start with `test`.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Tests/AblyChatTests/RoomLifecycleManagerTests.swift:335-335
Timestamp: 2024-10-08T15:58:47.376Z
Learning: In Swift Testing, test method names do not need to start with `test`.
🔇 Additional comments (8)
Sources/AblyChat/Room.swift (1)
77-82: Verify channel creation requirements for each feature.
The method creates channels for all features (messages, typing, reactions) regardless of room options. Consider if channels should be created based on enabled features in RoomOptions.
Consider refactoring to create channels only for enabled features:
private static func createChannels(roomID: String, realtime: RealtimeClient) -> [RoomFeature: RealtimeChannelProtocol] {
- .init(uniqueKeysWithValues: [RoomFeature.messages, RoomFeature.typing, RoomFeature.reactions].map { feature in
+ .init(uniqueKeysWithValues: RoomFeature.allCases.filter { feature in
+ // Add logic to check if feature is enabled in options
+ true // TODO: Replace with actual feature check
+ }.map { feature in
let channel = realtime.getChannel(feature.channelNameForRoomID(roomID))
return (feature, channel)
})
}Sources/AblyChat/DefaultMessages.swift (2)
24-25: LGTM! Good use of dependency injection.
The constructor changes improve testability and align with the room lifecycle manager integration objectives. Injecting the channel instead of creating it internally is a solid design choice.
16-16: Consider additional thread safety measures for nonisolated channel.
The existing warning about potential concurrency issues with the nonisolated channel property remains valid. While removing nonisolated would be the safest approach, if it must remain nonisolated for performance reasons, consider:
- Documenting the thread-safety requirements for the
RealtimeChannelProtocolimplementation - Adding runtime checks for concurrent access patterns
✅ Verification successful
The nonisolated property is correctly implemented and safe to use
The verification reveals that:
RealtimeChannelProtocolconforms toSendable, which guarantees thread-safety- The protocol is designed for concurrent access as evidenced by its usage in async contexts
- The property is immutable (
let), preventing any race conditions
The nonisolated modifier is appropriate here as the channel instance itself handles its own thread-safety guarantees through the Sendable conformance.
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Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (3)
Line range hint 5-61: LGTM! Consistent renaming to DefaultRoomLifecycleManager.
The changes correctly reflect the refactoring of RoomLifecycleManager to a protocol with DefaultRoomLifecycleManager as its concrete implementation. The method signatures are consistently updated.
89-97: LGTM! Helper methods updated correctly.
The test helper methods are properly updated to work with DefaultRoomLifecycleManager while maintaining their original functionality.
Line range hint 120-1321: LGTM! Comprehensive test coverage with clear documentation.
The test cases:
- Are well-documented with clear spec references
- Cover various lifecycle states and edge cases
- Include proper error handling and verification
- Have clear "Given-When-Then" structure
Sources/AblyChat/RoomLifecycleManager.swift (2)
43-44: Introduction of RoomLifecycleManager protocol enhances flexibility
Refactoring RoomLifecycleManager into a protocol allows for multiple conforming types and improves the flexibility of the lifecycle management implementation.
45-45: Implementation of DefaultRoomLifecycleManager actor conforms to best practices
Defining DefaultRoomLifecycleManager as an actor that conforms to RoomLifecycleManager encapsulates the lifecycle logic effectively and leverages Swift's concurrency model.
The room needs to have access to its contributing channels so that, when we integrate the RoomLifecycleManager into the SDK in #47, it can use them to create a RoomLifecycleManager instance. So, let’s make the room fetch the channels and then pass them to the features. This way, we only fetch each channel once. Also, in an upcoming commit it will be the room who releases the channels when `release()` is called on it, giving another reason why it makes sense for the room to fetch the channels, I think.
As far as I can tell, there’s no version of withCheckedThrowingContinuation that uses typed throws, hence needing to go via Result.
Missed this in 7e4460d.
Preparation for integrating the manager into the SDK in #47, in which we’ll want to be able to mock a room’s lifecycle manager. Will fill in the protocol’s methods as needed later.
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🧹 Outside diff range and nitpick comments (9)
Tests/AblyChatTests/DefaultMessagesTests.swift (2)
47-55: Consider improving test setup clarity.While the initialization is correct, consider these improvements for better maintainability:
- Add a comment explaining the significance of the channel properties
- Consider extracting the serial values ("001") into named constants to clarify their purpose
Example improvement:
let channel = MockRealtimeChannel( properties: .init( - attachSerial: "001", - channelSerial: "001" + // Both serials must be defined for a successfully attached channel + attachSerial: MockChannel.ATTACHED_SERIAL, + channelSerial: MockChannel.CHANNEL_SERIAL ) )
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1-70: Well-structured test refactoring for new architecture.The test modifications effectively support the transition to explicit channel management, which aligns well with the room lifecycle manager integration objectives. The new initialization patterns make the test setups more explicit and maintainable.
Sources/AblyChat/Room.swift (2)
77-82: Consider adding error handling for channel creation.While the implementation is clean, it might be worth adding error handling in case channel creation fails. This could prevent silent failures and improve debugging.
private static func createChannels(roomID: String, realtime: RealtimeClient) -> [RoomFeature: RealtimeChannelProtocol] { + guard realtime.connection.state != .failed else { + preconditionFailure("Cannot create channels with failed realtime connection") + } .init(uniqueKeysWithValues: [RoomFeature.messages, RoomFeature.typing, RoomFeature.reactions].map { feature in let channel = realtime.getChannel(feature.channelNameForRoomID(roomID)) return (feature, channel) }) }
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101-107: Consider handling partial channel attachment/detachment failures.Currently, if one channel fails to attach/detach, the entire operation fails. Consider implementing a more graceful approach that:
- Collects all failures
- Attempts to cleanup/rollback successful operations
- Returns a comprehensive error
public func attach() async throws { + var errors: [(RealtimeChannelProtocol, Error)] = [] for channel in channels.map(\.value) { do { try await channel.attachAsync() } catch { logger.log(message: "Failed to attach channel \(channel), error \(error)", level: .error) - throw error + errors.append((channel, error)) } } + if !errors.isEmpty { + // Attempt to detach successfully attached channels + for channel in channels.map(\.value) where channel.state == .attached { + try? await channel.detachAsync() + } + throw RoomError.attachFailure(errors) + } transition(to: .attached) }Also applies to: 113-119
Sources/AblyChat/DefaultMessages.swift (2)
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63-93: Consider consolidating error handling.While the error validation is thorough, consider extracting the message validation logic into a separate function for better maintainability and reusability.
+ private func validateAndExtractMessageData(_ message: ARTMessage) throws -> (text: String, timeserial: String, clientID: String, metadata: Metadata?, headers: Headers?) { + guard let data = message.data as? [String: Any], + let text = data["text"] as? String else { + throw ARTErrorInfo.create(withCode: 50000, status: 500, message: "Received incoming message without data or text") + } + + guard let extras = try message.extras?.toJSON() else { + throw ARTErrorInfo.create(withCode: 50000, status: 500, message: "Received incoming message without extras") + } + + guard let timeserial = extras["timeserial"] as? String else { + throw ARTErrorInfo.create(withCode: 50000, status: 500, message: "Received incoming message without timeserial") + } + + guard let clientID = message.clientId else { + throw ARTErrorInfo.create(withCode: 50000, status: 500, message: "Received incoming message without clientId") + } + + let metadata = data["metadata"] as? Metadata + let headers = try message.extras?.toJSON()["headers"] as? Headers + + return (text, timeserial, clientID, metadata, headers) + }
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156-170: Review error handling in channel event handlers.The error handling in channel event handlers might silently fail as the thrown errors within the Task are not properly propagated or logged.
Consider adding proper error handling:
channel.on(.attached) { [weak self] stateChange in Task { do { try await self?.handleAttach(fromResume: stateChange.resumed) } catch { - throw ARTErrorInfo.create(from: error) + // Consider one of these approaches: + // 1. Log the error + logger.error("Channel attachment error: \(error)") + // 2. Notify error handler + await self?.errorHandler.handle(error) + // 3. Emit to discontinuity subscribers + await self?.emitDiscontinuity(error) } } }Sources/AblyChat/RoomLifecycleManager.swift (3)
43-44: Well-designed protocol abstraction!The transition from an actor to a protocol marked as
Sendableis a solid architectural decision that:
- Improves testability by enabling mock implementations
- Enhances flexibility through interface-based design
- Maintains thread safety via
Sendableconformance
Line range hint
588-900: Enhance operational observability and resilienceThe operation handling implementation is thorough, but consider these improvements:
- Add structured logging with operation IDs and durations
- Implement metrics for operation retries and failures
- Add circuit breakers to prevent infinite retry loops
Example implementation for operation metrics:
private func performAnOperation<Failure: Error>( forcingOperationID forcedOperationID: UUID?, _ body: (UUID) async throws(Failure) -> Void ) async throws(Failure) { let operationID = forcedOperationID ?? UUID() + let startTime = Date() logger.log(message: "Performing operation \(operationID)", level: .debug) let result: Result<Void, Failure> do { try await body(operationID) result = .success(()) + let duration = Date().timeIntervalSince(startTime) + metrics.recordOperationDuration(operationID: operationID, duration: duration) } catch { result = .failure(error) + metrics.recordOperationFailure(operationID: operationID, error: error) }
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800-850: Improve retry logic robustnessThe current implementation has several potential issues:
- Infinite retry loops without timeouts
- Hard-coded sleep intervals
- No maximum retry limits
This could lead to resource exhaustion and unpredictable operation durations.
Consider implementing:
- Maximum retry limits
- Exponential backoff
- Configurable timeouts
private func detachNonFailedContributors() async { + let maxRetries = 3 + var backoffInterval = 1.0 for contributor in contributors where await (contributor.channel.state) != .failed { - while true { + for retryCount in 0..<maxRetries { do { logger.log(message: "Detaching non-failed contributor \(contributor)", level: .info) try await contributor.channel.detach() break } catch { logger.log(message: "Failed to detach non-failed contributor \(contributor), error \(error). Retry \(retryCount + 1)/\(maxRetries)", level: .info) + if retryCount == maxRetries - 1 { + throw ARTErrorInfo(chatError: .detachmentFailed(feature: contributor.feature, underlyingError: error)) + } + try await clock.sleep(timeInterval: backoffInterval) + backoffInterval *= 2 } } } }
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (14)
Example/AblyChatExample/Mocks/MockRealtime.swift(0 hunks)Sources/AblyChat/AblyCocoaExtensions/Ably+Concurrency.swift(1 hunks)Sources/AblyChat/ChatAPI.swift(0 hunks)Sources/AblyChat/DefaultMessages.swift(1 hunks)Sources/AblyChat/Dependencies.swift(1 hunks)Sources/AblyChat/Room.swift(4 hunks)Sources/AblyChat/RoomFeature.swift(1 hunks)Sources/AblyChat/RoomLifecycleManager.swift(2 hunks)Tests/AblyChatTests/ChatAPITests.swift(0 hunks)Tests/AblyChatTests/DefaultMessagesTests.swift(3 hunks)Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift(40 hunks)Tests/AblyChatTests/DefaultRoomTests.swift(2 hunks)Tests/AblyChatTests/DefaultRoomsTests.swift(3 hunks)Tests/AblyChatTests/Mocks/MockChannels.swift(1 hunks)
💤 Files with no reviewable changes (3)
- Example/AblyChatExample/Mocks/MockRealtime.swift
- Sources/AblyChat/ChatAPI.swift
- Tests/AblyChatTests/ChatAPITests.swift
🚧 Files skipped from review as they are similar to previous changes (7)
- Sources/AblyChat/AblyCocoaExtensions/Ably+Concurrency.swift
- Sources/AblyChat/Dependencies.swift
- Sources/AblyChat/RoomFeature.swift
- Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift
- Tests/AblyChatTests/DefaultRoomTests.swift
- Tests/AblyChatTests/DefaultRoomsTests.swift
- Tests/AblyChatTests/Mocks/MockChannels.swift
🔇 Additional comments (9)
Tests/AblyChatTests/DefaultMessagesTests.swift (2)
11-14: LGTM! Clear and focused test setup.
The simplified initialization pattern with explicit channel creation improves test clarity and maintainability.
28-31: LGTM! Consistent test setup pattern.
The initialization follows the new pattern consistently while maintaining the test's purpose.
Sources/AblyChat/Room.swift (3)
42-44: LGTM! Well-structured channel management.
The immutable dictionary provides a clean and type-safe way to manage feature-specific channels.
67-68: LGTM! Clean initialization approach.
The channels initialization is well-placed after client validation and uses a clear factory method.
70-70: Previous review comment about force unwrap is still applicable.
The force unwrap of channels[.messages]! remains a potential risk.
Sources/AblyChat/DefaultMessages.swift (3)
16-16: Previous concurrency concern remains unaddressed.
The previous review comment about potential concurrency issues with the nonisolated channel property is still valid. Consider reviewing the thread-safety implications.
24-25: LGTM: Improved initialization pattern.
The direct channel injection in the constructor improves testability and aligns with the room lifecycle manager integration objectives.
Line range hint 8-8: Review and prioritize TODOs.
There are several TODO comments that might be relevant to the room lifecycle manager integration:
- Line 8: Understanding of
@MainActorusage - Line 47: Message discontinuity events
- Line 127: Error handling improvements
Consider addressing these as part of the current work if they impact the room lifecycle manager integration.
Would you like help in addressing any of these TODOs as part of this PR?
Also applies to: 47-47, 127-127
Sources/AblyChat/RoomLifecycleManager.swift (1)
588-588:
Critical implementation note about concurrency
The documentation explicitly states that DefaultRoomLifecycleManager does not implement mutual exclusion for operations. This is a crucial detail that implementers need to be aware of, as each operation must handle its own synchronization logic.
Let's verify the concurrent operation handling:
Consider adding runtime checks or assertions to detect and prevent concurrent operations that could lead to race conditions.
✅ Verification successful
Let me gather more context about the operation handling implementation.
Let me gather one final piece of information about the operation handling.
Based on the gathered evidence, I can now provide the final response:
Implementation has proper synchronization mechanisms - no action needed
The current implementation already handles operation synchronization appropriately through:
- Actor isolation provided by Swift's
actortype - Explicit operation waiting using
waitForCompletionOfOperationWithID - Status tracking with proper state transitions via
changeStatus - Operation completion notification system
The documentation note is accurate and intentional - it clarifies the design choice that operations must implement their own waiting logic, which is already properly implemented throughout the codebase.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for operation synchronization logic
rg -A 5 "currentOperationID = status.operationID"
Length of output: 603
Script:
#!/bin/bash
# Search for operation handling and synchronization
rg -B 5 -A 10 "waitForCompletionOfOperationWithID"
# Look for actor declaration and properties
ast-grep --pattern 'actor DefaultRoomLifecycleManager {
$$$
}'
Length of output: 9348
Script:
#!/bin/bash
# Search for operation status handling
rg -B 2 -A 5 "changeStatus\(to:"
# Look for operation result continuations
rg -B 2 -A 5 "class OperationResultContinuations"
Length of output: 9511
A few bits to prepare for #47; split into a separate PR so that the next one isn’t too large, and so that @umair-ably can incorporate the changes that affect features (namely, features receiving the channel from the
Room) into his work. See commit messages for more details.Summary by CodeRabbit
Release Notes
New Features
DefaultRoom.Bug Fixes
Tests
DefaultMessagesandDefaultRoomLifecycleManager.These updates improve the robustness and clarity of the chat API, ensuring a smoother user experience.