[ECO-4985] Trigger the RETRY operation where spec says to #128
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Actionable comments posted: 4
🧹 Outside diff range and nitpick comments (14)
Tests/AblyChatTests/Mocks/MockRoomLifecycleManager.swift (1)
Line range hint
47-51: Consider enhancing the mock to support RETRY testing.Since this PR implements the RETRY operation as per spec, consider enhancing this mock to properly simulate and verify retry scenarios in tests.
Example enhancement:
func onRoomStatusChange(bufferingPolicy: BufferingPolicy) async -> Subscription<RoomStatusChange> { let subscription = Subscription<RoomStatusChange>(bufferingPolicy: bufferingPolicy) subscriptions.append(subscription) + // Simulate retry behavior if needed + if case .retrying = roomStatus { + subscription.emit(RoomStatusChange(from: .retrying, to: .attached)) + } return subscription }Sources/AblyChat/Room.swift (2)
Line range hint
13-14: Implement thetypingproperty or mark it as unavailableThe
typingproperty is documented but not implemented, currently triggering afatalError. Consider either:
- Implementing the typing functionality, or
- Adding
@available(*, unavailable, message: "Typing functionality will be available in a future release")attribute for better developer experience.Would you like me to help implement the typing functionality or add the availability attribute?
Line range hint
193-195: Improve error message for unimplemented typing featureThe current error message "Not yet implemented" is less descriptive compared to other feature properties. Consider using a more informative message similar to other properties:
- public nonisolated var typing: any Typing { - fatalError("Not yet implemented") - } + public nonisolated var typing: any Typing { + fatalError("Typing is not yet implemented for this room") + }Sources/AblyChat/RoomLifecycleManager.swift (2)
328-350: Ensure DEBUG code does not affect release buildsThe code within the
#if DEBUGblock introduces additional subscriptions and methods for testing purposes.Confirm that:
- All code within
#if DEBUGis properly excluded from release builds.- No unintended side effects occur due to this code when compiling in release mode.
- The testing code does not interfere with the production logic.
This helps maintain a clean separation between test and production code.
730-734: Future-proofing theOperationKindenumCurrently,
OperationKindonly has one case:retry. If more operation kinds are expected in the future, this structure is appropriate.If no additional operation kinds are planned, consider simplifying the code by removing the enum and directly handling the retry operation to reduce complexity.
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (9)
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245-254: Missing Await for Asynchronous TaskThe
async let attachedStatusChangeis declared but not awaited, which can lead to unexpected behavior.Await the
attachedStatusChangeto properly handle the asynchronous operation.245 let statusChangeSubscription = await manager.onRoomStatusChange(bufferingPolicy: .unbounded) 246 async let attachedStatusChange = statusChangeSubscription.first { $0.current == .attached } 247 248 // When: `performAttachOperation()` is called on the lifecycle manager 249 try await manager.performAttachOperation() 250 251 // Then: It calls `attach` on all the contributors, the room attach operation succeeds, it emits a status change to ATTACHED, and its current status is ATTACHED 252 for contributor in contributors { 253 #expect(await contributor.channel.attachCallCount > 0) 254 } + + // Await the attachedStatusChange to consume the async task + _ = await attachedStatusChange
313-315: Test Function Name Is Too Long and Difficult to ReadThe test function name
attach_whenContributorFailsToAttachAndEntersSuspended_transitionsToSuspendedAndPerformsRetryOperationis overly long and hard to read.Consider renaming the function to make it more concise and readable while still conveying the test's purpose.
Example:
- func attach_whenContributorFailsToAttachAndEntersSuspended_transitionsToSuspendedAndPerformsRetryOperation() async throws { + func attach_failingContributorTriggersSuspendedStateAndRetry() async throws {
341-348: Possible Code Duplication in Test SetupThe creation of contributors with similar behaviors is repeated, which could be refactored to improve test readability and maintainability.
Consider extracting a helper function to create contributors with common behaviors to reduce code duplication.
Example:
func createTestContributor(detachOperation: SignallableChannelOperation) -> MockRoomLifecycleContributor { return createContributor( attachBehavior: .success, // For RETRY attachment cycle detachBehavior: detachOperation.behavior ) }Then use it:
341 } else { 342 // These contributors will be detached by the RETRY operation 343 let detachOperation = SignallableChannelOperation() 344 nonSuspendedContributorsDetachOperations.append(detachOperation) 345 346- return createContributor( 347- attachBehavior: .success, 348- detachBehavior: detachOperation.behavior 349- ) + return createTestContributor(detachOperation: detachOperation)
Line range hint
726-737: Asynchronous Task Not AwaitedThe
async let asyncLetStatusChangesis declared but never awaited, leading to unconsumed asynchronous tasks.Ensure that you consume the asynchronous sequence by iterating over it or awaiting its elements.
726 let statusChangeSubscription = await manager.onRoomStatusChange(bufferingPolicy: .unbounded) 727 async let asyncLetStatusChanges = Array(statusChangeSubscription.prefix(2)) 728 729 // When: `performDetachOperation()` is called on the manager 730 try await manager.performDetachOperation() 731 732 // Then: It attempts to detach the channel 3 times... 733 #expect(await contributor.channel.detachCallCount == 3) 734 735 // ... 736 #expect(await clock.sleepCallArguments == Array(repeating: 0.25, count: 2)) 737 + // Await the status changes to consume the async task + let statusChanges = await asyncLetStatusChanges
Line range hint
1152-1161: Unconsumed Asynchronous TaskThe
async let maybeFailedStatusChangeis declared but never awaited or used, which can lead to issues with unhandled asynchronous work.Await the
maybeFailedStatusChangeto ensure proper test execution.1152 let roomStatusSubscription = await manager.onRoomStatusChange(bufferingPolicy: .unbounded) 1153 async let maybeFailedStatusChange = roomStatusSubscription.failedElements().first { _ in true } 1154 1155 // When: `performRetryOperation(...)` is called on the manager 1156 await manager.performRetryOperation(triggeredByContributor: contributors[0], errorForSuspendedStatus: .createUnknownError()) 1157 1158 // Then: The room transitions to FAILED... 1159 let failedStatusChange = try #require(await maybeFailedStatusChange) 1160 + // Ensure the async task is awaited + _ = failedStatusChange
Line range hint
1439-1452: Asynchronous Taskasync let _Not Awaited or UsedIn the code,
async let _ = manager.performDetachOperation()is declared but neither awaited nor used, which may lead to unforeseen issues.Even if the result is not needed, you should await the task to ensure it completes.
1439 let roomStatusSubscription = await manager.onRoomStatusChange(bufferingPolicy: .unbounded) 1440 async let _ = manager.performDetachOperation() 1441 _ = await roomStatusSubscription.first { $0.current == .detaching } 1442 + // Await the detach operation to ensure it completes + try await manager.performDetachOperation()Alternatively, if the operation is intended to run concurrently without immediate awaiting, store the task and ensure it's awaited before the test concludes.
Line range hint
1773-1874: Complex Test Setup with Deep Nesting May Affect ReadabilityThe test function has deep nesting and complex setup, which can make it hard to read and maintain.
Consider simplifying the test by breaking down the setup into smaller helper functions or by reducing nesting levels.
Example:
- Extract the contributor creation into a separate function.
- Flatten the nested closures where possible.
Line range hint
1894-1905: Possible Unhandled ExceptionIn the test, the
async let _ = manager.performAttachOperation(testsOnly_forcingOperationID: attachOperationID)is declared, but any exceptions thrown byperformAttachOperationmay not be properly handled.Ensure that exceptions are caught or the task is awaited with error handling.
1894 let roomStatusSubscription = await manager.onRoomStatusChange(bufferingPolicy: .unbounded) 1895 1896 let attachOperationID = UUID() 1897 async let _ = manager.performAttachOperation(testsOnly_forcingOperationID: attachOperationID) 1898 1899 // Wait for room to become ATTACHING 1900 _ = await roomStatusSubscription.attachingElements().first { _ in true } 1901 + // Await the attach operation to handle exceptions + do { + try await manager.performAttachOperation(testsOnly_forcingOperationID: attachOperationID) + } catch { + // Handle error appropriately + }
Line range hint
1932-1943: Unhandled Error fromperformAttachOperationSimilar to the previous comment, exceptions from
performAttachOperationmay not be properly handled, which could lead to test failures or crashes.Add error handling to ensure that any thrown errors are appropriately managed.
1932 let roomStatusSubscription = await manager.onRoomStatusChange(bufferingPolicy: .unbounded) 1933 1934 let attachOperationID = UUID() 1935 async let _ = manager.performAttachOperation(testsOnly_forcingOperationID: attachOperationID) 1936 1937 // Wait for room to become ATTACHING 1938 _ = await roomStatusSubscription.attachingElements().first { _ in true } 1939 + // Await the attach operation with error handling + do { + try await manager.performAttachOperation(testsOnly_forcingOperationID: attachOperationID) + } catch { + // Handle the error accordingly + }
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (4)
Sources/AblyChat/Room.swift(1 hunks)Sources/AblyChat/RoomLifecycleManager.swift(9 hunks)Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift(29 hunks)Tests/AblyChatTests/Mocks/MockRoomLifecycleManager.swift(1 hunks)
🧰 Additional context used
📓 Learnings (4)
Sources/AblyChat/Room.swift (1)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#120
File: Sources/AblyChat/RoomLifecycleManager.swift:322-324
Timestamp: 2024-11-19T13:22:50.638Z
Learning: In `Sources/AblyChat/RoomLifecycleManager.swift`, the `onRoomStatusChange(bufferingPolicy:)` method already has a TODO to manage subscriptions properly. Avoid flagging this issue in future reviews.
Sources/AblyChat/RoomLifecycleManager.swift (1)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#120
File: Sources/AblyChat/RoomLifecycleManager.swift:322-324
Timestamp: 2024-11-19T13:22:50.638Z
Learning: In `Sources/AblyChat/RoomLifecycleManager.swift`, the `onRoomStatusChange(bufferingPolicy:)` method already has a TODO to manage subscriptions properly. Avoid flagging this issue in future reviews.
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (1)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#120
File: Sources/AblyChat/RoomLifecycleManager.swift:322-324
Timestamp: 2024-11-19T13:22:50.638Z
Learning: In `Sources/AblyChat/RoomLifecycleManager.swift`, the `onRoomStatusChange(bufferingPolicy:)` method already has a TODO to manage subscriptions properly. Avoid flagging this issue in future reviews.
Tests/AblyChatTests/Mocks/MockRoomLifecycleManager.swift (1)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#120
File: Sources/AblyChat/RoomLifecycleManager.swift:322-324
Timestamp: 2024-11-19T13:22:50.638Z
Learning: In `Sources/AblyChat/RoomLifecycleManager.swift`, the `onRoomStatusChange(bufferingPolicy:)` method already has a TODO to manage subscriptions properly. Avoid flagging this issue in future reviews.
🔇 Additional comments (13)
Tests/AblyChatTests/Mocks/MockRoomLifecycleManager.swift (1)
Line range hint 47-51: LGTM! Method rename aligns with the protocol changes.
The rename from onChange to onRoomStatusChange maintains consistency with the protocol changes and improves clarity.
Sources/AblyChat/Room.swift (1)
221-221: LGTM: Method implementation aligns with lifecycle manager
The change correctly delegates to the lifecycle manager's onRoomStatusChange method, maintaining consistency with the protocol requirements.
Sources/AblyChat/RoomLifecycleManager.swift (6)
48-48: Consistency in method naming
The method onChange(bufferingPolicy:) has been renamed to onRoomStatusChange(bufferingPolicy:). Ensure that this naming is consistently applied across all related protocols and classes to maintain clarity and avoid confusion.
361-367: Avoid redundant status change emissions
The check to prevent double-emission of room status changes is important.
Ensure that the condition if new.toRoomStatus != previous.toRoomStatus correctly handles all possible state transitions to avoid redundant notifications.
370-373: Thread safety with shared resources
The method emitRoomStatusChange(_:) iterates over roomStatusChangeSubscriptions. In an actor context, access to shared mutable state is safe, but ensure that all interactions with roomStatusChangeSubscriptions respect Swift concurrency rules.
322-324:
Potential memory leak with subscriptions
In onRoomStatusChange(bufferingPolicy:), subscriptions are appended to roomStatusChangeSubscriptions but never removed, which can lead to memory leaks.
Consider implementing a mechanism to remove subscriptions when they are no longer active:
internal func onRoomStatusChange(bufferingPolicy: BufferingPolicy) -> Subscription<RoomStatusChange> {
let subscription: Subscription<RoomStatusChange> = .init(bufferingPolicy: bufferingPolicy)
roomStatusChangeSubscriptions.append(subscription)
+ subscription.onCancel {
+ self.roomStatusChangeSubscriptions.removeAll { $0 === subscription }
+ }
return subscription
}⛔ Skipped due to learnings
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#120
File: Sources/AblyChat/RoomLifecycleManager.swift:322-324
Timestamp: 2024-11-19T13:22:50.638Z
Learning: In `Sources/AblyChat/RoomLifecycleManager.swift`, the `onRoomStatusChange(bufferingPolicy:)` method already has a TODO to manage subscriptions properly. Avoid flagging this issue in future reviews.
91-91:
Manage subscriptions to prevent memory leaks
Currently, roomStatusChangeSubscriptions holds onto all subscriptions indefinitely. This could lead to memory leaks as subscriptions accumulate over time.
Consider adding logic to remove subscriptions when they are no longer needed:
private var roomStatusChangeSubscriptions: [Subscription<RoomStatusChange>] = []
+ private func removeSubscription(_ subscription: Subscription<RoomStatusChange>) {
+ roomStatusChangeSubscriptions.removeAll { $0 === subscription }
+ }Ensure that when a subscription is completed or cancelled, it is removed from the roomStatusChangeSubscriptions array.
⛔ Skipped due to learnings
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#120
File: Sources/AblyChat/RoomLifecycleManager.swift:322-324
Timestamp: 2024-11-19T13:22:50.638Z
Learning: In `Sources/AblyChat/RoomLifecycleManager.swift`, the `onRoomStatusChange(bufferingPolicy:)` method already has a TODO to manage subscriptions properly. Avoid flagging this issue in future reviews.
214-214: Consistent error handling in state transitions
In the toRoomStatus computed property, ensure that the handling of the .suspendedAwaitingStartOfRetryOperation case correctly propagates the associated error.
Run the following script to check the consistency:
Expect to find matches that confirm the error is correctly passed to RoomStatus.
✅ Verification successful
Error handling is correctly implemented in state transitions
The code correctly propagates the error in the .suspendedAwaitingStartOfRetryOperation case. From the codebase analysis:
- The internal state
.suspendedAwaitingStartOfRetryOperation(retryOperationTask:, error:)correctly maps to the publicRoomStatus.suspended(error:)state - The error is properly propagated in the
toRoomStatuscomputed property:
case let .suspendedAwaitingStartOfRetryOperation(_, error):
.suspended(error: error)- This matches the public
RoomStatusenum definition wheresuspendedcase properly carries the error:case suspended(error: ARTErrorInfo)
The implementation ensures consistent error handling during state transitions, particularly when moving between suspended states.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify that all Status enum cases properly convert to RoomStatus with correct error propagation.
ast-grep --pattern $'case let .suspendedAwaitingStartOfRetryOperation(_, error):\n .suspended(error: error)'
Length of output: 111
Script:
#!/bin/bash
# Let's first find the file containing the state transition code
rg -l "suspendedAwaitingStartOfRetryOperation" --type swift
# Then examine the full context of the state machine implementation
rg "toRoomStatus|suspendedAwaitingStartOfRetryOperation" --type swift -B 2 -A 2
Length of output: 10161
Script:
#!/bin/bash
# Let's examine the RoomStatus enum to understand the suspended state definition
rg "enum RoomStatus" --type swift -B 1 -A 10
# Also check for any suspended case handling in the codebase
rg "case.*suspended.*error" --type swift -A 1
Length of output: 2116
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (5)
322-328: Ensure Proper Handling of Asynchronous Closure
In the attachBehavior, an asynchronous closure is used, but there is no explicit await inside the closure, which might cause issues if the closure's execution depends on asynchronous operations.
Verify that the closure within fromFunction handles asynchronous operations correctly. If asynchronous calls are expected, ensure that they are properly awaited.
Line range hint 927-932: Potential Compiler Crash Due to Inline Expectation
The comment mentions that using #expect(…, throws:) causes the compiler to crash.
Investigate the cause of the compiler crash when using #expect with throws. It may be a Swift compiler bug or misuse of the #expect macro.
Would you like assistance in isolating the issue or filing a bug report for the Swift compiler?
Line range hint 726-737: Inefficient Use of Array Conversion on Async Sequence
Converting an asynchronous sequence to an array using Array(statusChangeSubscription.prefix(2)) may lead to unnecessary buffering and memory usage.
[performance_issue]
Consider processing the elements as they arrive without converting the entire sequence to an array unless all elements are needed simultaneously.
Line range hint 927-932: Commented Code Indicates Potential Issue
The comments suggest that using #expect(…, throws:) causes the compiler to crash, leading to the use of an alternative approach.
Investigate the root cause of the compiler crash associated with #expect(…, throws:). It might be beneficial to report this issue if it is a compiler bug.
Would you like help in isolating this issue or finding a workaround that doesn't compromise test clarity?
186-189:
Potential Memory Leak with Unconsumed async let Binding
In the test function, the async let binding for detachingStatusChange is declared but never awaited or canceled. This could lead to a memory leak or unintended behavior because the asynchronous task remains unconsumed.
To fix this issue, ensure that you await the detachingStatusChange before the test concludes or explicitly cancel it if it's no longer needed.
186 let statusChangeSubscription = await manager.onRoomStatusChange(bufferingPolicy: .unbounded)
187 // Wait for the manager to enter DETACHING; this is our sign that the DETACH operation triggered in (1) has started
188 async let detachingStatusChange = statusChangeSubscription.first { $0.current == .detaching }
189
+ // Await the detachingStatusChange to consume the async task
+ _ = await detachingStatusChange⛔ Skipped due to learnings
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#118
File: Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift:988-988
Timestamp: 2024-11-18T19:45:48.787Z
Learning: In Swift, not awaiting an `async let` variable does not lead to resource leaks.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Tests/AblyChatTests/RoomLifecycleManagerTests.swift:627-631
Timestamp: 2024-11-12T15:07:39.465Z
Learning: The closure `detachImpl` in `RoomLifecycleManagerTests.swift` functions as intended without external state variables to track invocation count.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Tests/AblyChatTests/RoomLifecycleManagerTests.swift:335-335
Timestamp: 2024-11-12T15:07:31.865Z
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:499-504
Timestamp: 2024-11-12T15:07:31.865Z
Learning: In test closures, parameters like `callCount` may be used to track invocation counts correctly across invocations.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Tests/AblyChatTests/RoomLifecycleManagerTests.swift:941-941
Timestamp: 2024-11-12T15:07:31.866Z
Learning: When a TODO comment references an existing GitHub issue, it's acceptable to leave it in the code without requesting its removal.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Tests/AblyChatTests/RoomLifecycleManagerTests.swift:836-836
Timestamp: 2024-11-12T15:07:31.866Z
Learning: Before suggesting the removal of TODO comments, check if they reference existing GitHub issues that track the pending work.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#61
File: Tests/AblyChatTests/DefaultRoomTests.swift:33-34
Timestamp: 2024-11-12T15:07:39.465Z
Learning: In Swift Testing, using `#expect` with `await` may result in less informative failure messages when debugging asynchronous tests.
✅ Actions performedReviews paused. |
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@umair-ably @maratal fyi that I’m merging this one since #120 was already approved |
This is a re-opening of the already-approved-but-accidentally-merged-at-wrong-time #120. Will merge.
Summary by CodeRabbit
New Features
typingproperty in the room protocol, paving the way for future typing functionality.Improvements
OperationKindenum to better manage scheduled operations.Bug Fixes
Tests