[ECO-4986] Implement the RETRY room lifecycle operation
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WalkthroughThe changes in this pull request primarily focus on enhancing the Changes
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Actionable comments posted: 7
🧹 Outside diff range and nitpick comments (13)
Tests/AblyChatTests/Helpers/Subscription+RoomStatusChange.swift (2)
14-35: LGTM! Consider adding usage examples in documentation.The implementation of
StatusChangeWithErrorand its initializers is clean and follows Swift best practices. The failable initializers effectively handle the pattern matching for their respective status cases.Consider adding code examples in the documentation to demonstrate typical usage patterns, which would be particularly helpful for other test authors. For example:
// Example usage: let statusChange = RoomStatusChange(previous: .attached, current: .suspended(error)) if let withError = StatusChangeWithError(maybeSuspendedStatusChange: statusChange) { // Handle suspended status with error }
44-56: Fix inconsistent indentation in the attaching status initializer.The implementation is correct, but there's an indentation inconsistency in the
maybeAttachingStatusChangeinitializer.Apply this diff to fix the indentation:
init?(maybeAttachingStatusChange: RoomStatusChange) { if case let .attaching(error) = maybeAttachingStatusChange.current { self.init(statusChange: maybeAttachingStatusChange, error: error) - } else { - return nil - } + } else { + return nil + } }Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (1)
89-91: Consider simplifying the recursive behavior handling.The current implementation works but could be more elegant.
Consider this more concise approach:
- let behavior = await function(callCount) - try await performBehavior(behavior, callCount: callCount) - return + return try await performBehavior(await function(callCount), callCount: callCount)Sources/AblyChat/RoomLifecycleManager.swift (7)
184-190: Add missing documentation for newStatuscasesThe new
StatuscasesattachingDueToRetryOperationanddetachedDueToRetryOperationshould include documentation comments to explain their purposes and when they are used. This will enhance code readability and maintainability.
877-879: Use configurable constants for wait durationsHardcoding wait durations like
0.25seconds may cause maintenance issues and reduce flexibility. Consider defining these durations as constants or configuration parameters to allow easy adjustments in the future.Apply this diff:
-let waitDuration = 0.25 +let waitDuration = retryWaitDuration // Define retryWaitDuration as a constant elsewhereAnd define
retryWaitDurationat an appropriate place:private let retryWaitDuration: TimeInterval = 0.25
985-997: Ensure proper access control for new methodsThe new method
performRetryOperationis marked asinternal. Review if it should have a different access level, such asprivateorpublic, to align with the intended encapsulation and API exposure.
1066-1067: Revisit assumptions about channel state and state listenersThe comment mentions assumptions about channel states and threading. These assumptions may not hold true in a concurrent environment, leading to missed state changes. Consider implementing a mechanism to ensure that state changes are not missed, such as using locks or atomic properties.
826-842: Simplify and document theDetachmentCycleTriggerenumThe
DetachmentCycleTriggerenum could benefit from additional documentation and possibly simplification if appropriate. Clarifying its purpose and usage will aid in future maintenance and understanding.
685-686: Consider handling unexpected states explicitlyIn the ATTACH operation, certain states fall through without specific handling. While you have a default
break, it may be safer to handle unexpected states explicitly, possibly logging a warning or throwing an error to avoid silent failures.
993-997: Ensure consistency in method parameter namingIn
performRetryOperation, the parametertestsOnly_forcingOperationIDincludes a prefixtestsOnly_, implying it's for testing purposes. Ensure this naming convention is consistent across all test-related methods, or consider removing the prefix if it's also used in production code.Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (3)
918-923: Consider Adding Assertions to Strengthen Test ValidityIn the
retry_detachesAllContributorsExceptForTriggeringtest at lines 918-923, consider adding assertions to verify the state of themanagerafter theperformRetryOperationcall. This can help ensure that the retry logic behaves as expected.
1040-1119: Clarify Test Cases with Additional DocumentationThe
retry_whenTriggeringContributorEndsUpFailed_terminatesOperationtest covers complex logic based on different conditions. Adding comments or splitting the test into smaller, more focused tests could improve readability and maintainability.
1218-1231: Handle Possible Errors inattachedStatusChangeAwaitingAt lines 1218-1231, when awaiting
attachedStatusChange, consider handling potential errors or timeouts if the status change does not occur as expected. This will make the test more robust against unexpected failures.
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📒 Files selected for processing (4)
Sources/AblyChat/RoomLifecycleManager.swift(16 hunks)Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift(8 hunks)Tests/AblyChatTests/Helpers/Subscription+RoomStatusChange.swift(1 hunks)Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift(6 hunks)
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📓 Learnings (3)
Sources/AblyChat/RoomLifecycleManager.swift (4)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Sources/AblyChat/RoomLifecycleManager.swift:0-0
Timestamp: 2024-11-12T15:07:31.866Z
Learning: In `RoomLifecycleManager`, handling of unexpected contributor states after attach failure will be addressed in issue #49.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Sources/AblyChat/RoomLifecycleManager.swift:0-0
Timestamp: 2024-11-12T15:07:31.866Z
Learning: In `RoomLifecycleManager`, handling of unexpected contributor states after attach failure will be addressed in issue #49.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Sources/AblyChat/RoomLifecycleManager.swift:217-220
Timestamp: 2024-11-12T15:07:31.865Z
Learning: In `RoomLifecycleManager`, handling of missing `stateChange.reason` when `stateChange.resumed` is `false` is being tracked in issue #74. Future reviews should be aware of this planned work.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Sources/AblyChat/RoomLifecycleManager.swift:217-220
Timestamp: 2024-11-12T15:07:31.865Z
Learning: In `RoomLifecycleManager`, handling of missing `stateChange.reason` when `stateChange.resumed` is `false` is being tracked in issue #74. Future reviews should be aware of this planned work.
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (2)
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:627-631
Timestamp: 2024-11-12T15:07:31.866Z
Learning: The closure `detachImpl` in `RoomLifecycleManagerTests.swift` functions as intended without external state variables to track invocation count.
Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (2)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift:98-102
Timestamp: 2024-11-12T15:07:31.865Z
Learning: The cleanup of old subscriptions in `MockRoomLifecycleContributorChannel` is acknowledged with a TODO comment and is tracked in issue #36.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift:98-102
Timestamp: 2024-11-12T15:07:31.865Z
Learning: The cleanup of old subscriptions in `MockRoomLifecycleContributorChannel` is acknowledged with a TODO comment and is tracked in issue #36.
🔇 Additional comments (11)
Tests/AblyChatTests/Helpers/Subscription+RoomStatusChange.swift (2)
59-69: LGTM! Excellent use of functional programming patterns.
The filter methods are well-implemented with:
- Consistent use of
compactMapfor filtering and transformation - Clear type signatures that leverage Swift's type system
- Concise implementation that maintains readability
Line range hint 1-69: Verify test coverage for retry-specific status changes.
While the implementation provides good infrastructure for testing status changes, ensure that it adequately covers retry-specific scenarios mentioned in ECO-4986.
✅ Verification successful
Based on the search results, I can now generate the final response as I have sufficient information about the retry-related test coverage.
Test coverage for retry operation is comprehensive and well-structured
The implementation in Subscription+RoomStatusChange.swift aligns perfectly with the test requirements as evidenced by the extensive test coverage in DefaultRoomLifecycleManagerTests.swift, which includes:
- Test cases for all retry scenarios:
retry_detachesAllContributorsExceptForTriggeringretry_ifDetachFailsDueToNonFailedChannelState_retriesretry_ifDetachFailsDueToFailedChannelState_transitionsToFailedretry_whenTriggeringContributorEndsUpFailed_terminatesOperationretry_whenTriggeringContributorEndsUpAttached_proceedsToAttachmentCycleretry_whenAttachmentCycleSucceedsretry_whenAttachmentCycleFails
The StatusChangeWithError and StatusChangeWithOptionalError structures provide the necessary infrastructure to test these scenarios effectively.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for retry-related test cases in the test files
rg -l "retry" Tests/AblyChatTests/ | while read -r file; do
echo "=== $file ==="
rg -A 5 "retry|RETRY" "$file"
done
Length of output: 11980
Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (4)
7-7: LGTM! Well-structured initialization changes.
The new property and initializer changes are well-implemented, maintaining thread safety and providing good defaults.
Also applies to: 19-28
60-63: LGTM! Clear and purposeful enum definition.
The SubscribeToStateBehavior enum provides clear control over subscription behavior in tests.
47-47: Verify recursion safety in fromFunction case.
The change to return AttachOrDetachBehavior enables more flexible behavior composition, but we should ensure that recursive behavior chains have proper termination conditions.
✅ Verification successful
Based on the search results, I can now provide a conclusive response about the recursion safety:
No recursion safety concerns in fromFunction case
The implementation shows that fromFunction is used safely in a controlled manner:
- The enum case is part of a mock testing infrastructure
- The function execution in
performBehaviorshows proper handling where recursive behaviors are immediately executed - Usage patterns in tests demonstrate controlled, single-level behavior chains where:
- Most uses directly return
.completeresults - The function is primarily used for test control flow and not for recursive composition
- Most uses directly return
🏁 Scripts executed
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# Search for potential infinite recursion patterns in test files
rg -l "fromFunction.*fromFunction" --type swift Tests/
Length of output: 56
Script:
#!/bin/bash
# Let's first check the implementation of AttachOrDetachBehavior enum
rg -A 10 "enum AttachOrDetachBehavior" --type swift
# Also search for any usage patterns of fromFunction
rg -A 5 "fromFunction" --type swift
# Check test cases that might reveal recursion patterns
rg -A 10 "class.*Tests.*AttachOrDetach" --type swift
Length of output: 7386
113-119: Consider implementing subscription cleanup.
The subscription handling looks good, but as noted in the TODO comment and issue #36, there's still a need to implement cleanup of old subscriptions.
✅ Verification successful
Let me verify if there are any subscription cleanup implementations or related code in the codebase.
Let me check for the actual Subscription array implementation and its usage.
Subscription cleanup implementation is still needed
The review comment is accurate. The code shows that subscriptions are being added to an array (subscriptions.append(subscription)) but there's no cleanup mechanism implemented. This is confirmed by:
- The open issue Find a way to clean up arrays of subscriptions #36 specifically tracking this cleanup requirement
- The mock channel implementations having unimplemented
unsubscribemethods - No existing cleanup code in the subscription management logic
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check the status of the subscription cleanup issue
gh issue view 36 --repo ably-labs/ably-chat-swift --json state,title,body
Length of output: 745
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#!/bin/bash
# Search for subscription cleanup related code
rg -i "unsubscribe|cleanup.*subscription|remove.*subscription" -A 3
# Search for Subscription type definition and usage
ast-grep --pattern 'class $_ {
$$$
var subscriptions: [Subscription]
$$$
}'
Length of output: 1944
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#!/bin/bash
# Search for Subscription array implementations and usage
rg -A 5 "\[Subscription\]"
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ast-grep --pattern 'func subscribeToState($$$) {
$$$
}'
Length of output: 1476
Sources/AblyChat/RoomLifecycleManager.swift (1)
823-824: Verify error handling in performDetachmentCycle
Ensure that errors thrown within performDetachmentCycle are appropriately caught and managed. Unhandled errors could propagate unexpectedly and cause the application to crash.
Run the following script to check for unhandled errors in performDetachmentCycle:
This will help identify any try await calls without proper do-catch handling within the method.
✅ Verification successful
This will help us analyze the error handling implementation within the method.
Error handling is properly implemented in performDetachmentCycle
The implementation shows appropriate error handling:
- The method is marked with
throwswhich correctly propagates errors to its callers - Inside the method, there's proper error handling with
do-catchblocks for detaching contributors - The method is called within
do-catchblocks in both usage locations:- In
bodyOfRetryOperationwhere errors are caught and logged - The original call site is part of a throwing async function, which is the correct pattern for error propagation
- In
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Search for unhandled errors in performDetachmentCycle method
# Test: Look for 'try await' without 'do-catch' blocks in the method
ast-grep --pattern $'func performDetachmentCycle($_) async throws {\n $$$\n try await $_\n $$$\n}'
Length of output: 98
Script:
#!/bin/bash
# Let's try a different approach to find the implementation of performDetachmentCycle
# First, let's find the file containing this method
rg -l "performDetachmentCycle"
# Then let's see the actual implementation with context
rg "performDetachmentCycle" -A 20 -B 5
Length of output: 6491
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (4)
74-78: Ensure All Call Sites Are Updated for New Parameters
New parameters initialErrorReason and subscribeToStateBehavior have been added to the createContributor function. Please verify that all call sites have been updated accordingly to pass the required arguments or handle the default values.
452-456: Verify Correct Handling of callCount in Async Closure
The closure detachResult at lines 452-456 uses callCount to determine behavior. Ensure that callCount is being incremented and passed correctly, and that it is thread-safe within the @Sendable asynchronous context to prevent concurrency issues.
655-659: Check Closure Capture of callCount for Concurrency Safety
In the closure detachImpl at lines 655-659, callCount is used to control the behavior based on invocation count. Please verify that callCount is safely captured and correctly incremented in a concurrent environment, especially within an @Sendable closure.
835-839: Ensure Thread-Safe Usage of callCount in detachImpl Closure
At lines 835-839, within the detachImpl closure, verify that callCount is managed correctly to avoid race conditions in concurrent execution. Since the closure is @Sendable, thread safety is crucial.
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (6)
Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (1)
89-91: Consider adding documentation for recursive behavior.The implementation correctly handles recursive behavior processing, but it would benefit from documentation explaining the recursion flow.
Add a comment explaining the recursive behavior:
case let .fromFunction(function): + // Recursively process the behavior returned by the function let behavior = await function(callCount) try await performBehavior(behavior, callCount: callCount) returnTests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (2)
929-930: Consider tracking TODOs in GitHub issues.There are several TODO comments indicating incomplete implementations or pending spec clarifications. It would be helpful to track these in GitHub issues for better visibility and follow-up.
Would you like me to help create GitHub issues for tracking these TODOs?
Also applies to: 1038-1039
676-676: Consider extracting magic numbers into named constants.The tests use magic numbers (0.25) for timeout values. Consider extracting these into named constants at the class level for better maintainability and clarity.
struct DefaultRoomLifecycleManagerTests { + // MARK: - Constants + + private enum Constants { + static let retryTimeoutInterval: TimeInterval = 0.25 + } // ... rest of the code ... // In test methods: - #expect(await clock.sleepCallArguments == Array(repeating: 0.25, count: 2)) + #expect(await clock.sleepCallArguments == Array(repeating: Constants.retryTimeoutInterval, count: 2))Also applies to: 854-854, 881-881
Sources/AblyChat/RoomLifecycleManager.swift (3)
184-186: Ensure Consistent Use ofretryOperationIDinStatusEnumThe addition of
attachingDueToRetryOperation(retryOperationID: UUID)enhances operation tracking. However, consider whether all statuses related to retries should consistently includeretryOperationID. This consistency can improve traceability and debugging.
209-211: Consistent Handling of Detached StatesThe mapping of both
.detachedand.detachedDueToRetryOperationto.detachedmay obscure the reason for detachment. Consider if a distinctRoomStatusis necessary to differentiate between standard detachment and detachment due to a retry operation.
877-878: Replace Magic Numbers with Named ConstantsThe
waitDurationis set to0.25, which is a magic number. Define it as a constant to improve code readability and maintainability.Apply this diff:
- let waitDuration = 0.25 + let waitDuration = retryWaitDurationAnd define
retryWaitDurationat an appropriate scope:private let retryWaitDuration: TimeInterval = 0.25This makes future adjustments easier and the code more self-documenting.
📜 Review details
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Review profile: CHILL
📒 Files selected for processing (3)
Sources/AblyChat/RoomLifecycleManager.swift(16 hunks)Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift(8 hunks)Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift(6 hunks)
🧰 Additional context used
📓 Learnings (2)
Sources/AblyChat/RoomLifecycleManager.swift (4)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Sources/AblyChat/RoomLifecycleManager.swift:0-0
Timestamp: 2024-11-12T15:07:31.866Z
Learning: In `RoomLifecycleManager`, handling of unexpected contributor states after attach failure will be addressed in issue #49.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Sources/AblyChat/RoomLifecycleManager.swift:0-0
Timestamp: 2024-11-12T15:07:31.866Z
Learning: In `RoomLifecycleManager`, handling of unexpected contributor states after attach failure will be addressed in issue #49.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Sources/AblyChat/RoomLifecycleManager.swift:217-220
Timestamp: 2024-11-12T15:07:31.865Z
Learning: In `RoomLifecycleManager`, handling of missing `stateChange.reason` when `stateChange.resumed` is `false` is being tracked in issue #74. Future reviews should be aware of this planned work.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Sources/AblyChat/RoomLifecycleManager.swift:217-220
Timestamp: 2024-11-12T15:07:31.865Z
Learning: In `RoomLifecycleManager`, handling of missing `stateChange.reason` when `stateChange.resumed` is `false` is being tracked in issue #74. Future reviews should be aware of this planned work.
Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (2)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift:98-102
Timestamp: 2024-11-12T15:07:31.865Z
Learning: The cleanup of old subscriptions in `MockRoomLifecycleContributorChannel` is acknowledged with a TODO comment and is tracked in issue #36.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift:98-102
Timestamp: 2024-11-12T15:07:31.865Z
Learning: The cleanup of old subscriptions in `MockRoomLifecycleContributorChannel` is acknowledged with a TODO comment and is tracked in issue #36.
🔇 Additional comments (13)
Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (3)
7-7: LGTM! Well-structured initialization changes.
The new property and initializer changes are well-implemented, maintaining thread safety and backward compatibility through default values.
Also applies to: 19-28
60-63: LGTM! Clear and purposeful enum definition.
The new SubscribeToStateBehavior enum provides clear control over subscription behavior in tests with well-named cases.
47-47: Verify the recursive behavior handling.
The change to return AttachOrDetachBehavior instead of AttachOrDetachResult enables more complex mocking scenarios. The @Sendable attribute correctly ensures thread safety.
Let's verify that this change is properly handled in all test cases:
#!/bin/bash
# Search for test cases using fromFunction to ensure they're updated
rg -l "fromFunction.*AttachOrDetachResult" Tests/Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (2)
452-456: LGTM! Good improvements to closure syntax.
The changes improve the code by:
- Adding
@Sendableattribute for Swift concurrency safety - Using explicit return statements for better readability
888-1286: Well-structured and comprehensive test coverage for the RETRY operation.
The test implementations are thorough and cover various scenarios including error handling, state transitions, and contributor management. The tests are well-documented with spec references.
Sources/AblyChat/RoomLifecycleManager.swift (8)
189-190: Clarify Inclusion of retryOperationID in suspended Status
The suspended case now includes retryOperationID. Ensure that this addition aligns with the intended design and that all logic handling suspended status accounts for the presence of retryOperationID.
201-202: Verify Mapping of New Statuses in toRoomStatus
In the toRoomStatus method, both .attachingDueToAttachOperation and .attachingDueToRetryOperation map to .attaching(error: nil). Confirm that this mapping accurately reflects the desired room status, especially in retry scenarios where specific error information might be relevant.
226-236: Update operationID Computation for Completeness
The operationID property now accounts for retryOperationID in several new statuses. Ensure that all statuses initiating an operation correctly provide an operationID to maintain accurate tracking throughout the lifecycle.
544-547: Clarify the Definition of hasOperationInProgress
The current comment indicates uncertainty about when an operation is considered in progress. It's crucial to define this clearly to prevent race conditions or logical errors. Refining this definition will improve code maintainability and developer understanding.
687-687: Handle Missing Cases in ATTACH Operation Switch
In the bodyOfAttachOperation, the switch statement may not handle all possible Status cases explicitly, particularly the .failed status. Ensure all statuses are appropriately managed to prevent unintended fall-through behavior.
718-718: Avoid Generating UUID Directly in State Transition
Generating a new UUID within the changeStatus call can lead to inconsistencies in operation tracking. It's better to create the retryOperationID beforehand and pass it as a parameter. This approach ensures consistent identification of retry operations.
972-976:
Properly Handle Task Cancellation During Sleep
Using try! with await clock.sleep can cause runtime crashes if the task is cancelled. It's essential to handle potential errors to ensure robustness.
Apply this diff:
- // swiftlint:disable:next force_try
- try! await clock.sleep(timeInterval: waitDuration)
+ do {
+ try await clock.sleep(timeInterval: waitDuration)
+ } catch {
+ logger.log(message: "Sleep was interrupted: \(error)", level: .info)
+ throw error
+ }This modification handles task cancellation gracefully, preventing unexpected crashes.
Likely invalid or redundant comment.
1036-1074:
Address Potential Threading Issues When Accessing Channel State
Accessing triggeringContributor.channel.state and errorReason separately may lead to inconsistent data due to threading. Retrieve both properties within the same async context to ensure consistency.
Apply this diff:
- if try await handleState(triggeringContributor.channel.state, triggeringContributor.channel.errorReason) {
+ let (channelState, errorReason) = await (
+ triggeringContributor.channel.state,
+ triggeringContributor.channel.errorReason
+ )
+ if try handleState(channelState, errorReason) {This ensures that both properties reflect the same state of the channel, reducing the risk of race conditions.
Likely invalid or redundant comment.
For whatever reason, I forgot to do this in some places.
Will use in an upcoming commit.
Add an option for it to emit a state change when you subscribe to its state. Will use in an upcoming commit.
We’ll use these when we implement the RETRY operation in #51. References to CHA-RL5* points are based on spec at 8ff947d.
This is to allow us to make the tests for the upcoming RETRY operation more realistic. Our initial implementation of the RETRY operation won’t actually put the room into the SUSPENDED status, though; I’ll figure out the right place to do that once we actually trigger this operation internally in #50.
This are now specified. Taken from spec version 8ff947d.
Based on spec at 8ff947d. The internal triggering of the RETRY operation (as specified by CHA-RL1h3 and CHA-RL4b9) will come in #50. Note that, since the RETRY operation does not currently cause a transition to SUSPENDED, the `hasOperationInProgress` manager property does not return `true` if there’s a RETRY in progress. (As mentioned in d2fe696, we’ll address this in #50.) Resolves #51.
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (7)
Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (1)
47-47: Good enhancement of the behavior patternThe change from
AttachOrDetachResulttoAttachOrDetachBehaviorenables recursive behavior composition, which is particularly useful for testing complex scenarios like retries.This pattern allows for powerful behavior composition. Consider documenting common behavior patterns that might be useful for other test cases.
Sources/AblyChat/RoomLifecycleManager.swift (4)
226-236: Consider using tuple pattern matching for better readabilityThe switch statement could be more concise by using tuple pattern matching for states with operation IDs.
Consider this refactor:
-case let .attachingDueToRetryOperation(retryOperationID): - retryOperationID -case let .detachedDueToRetryOperation(retryOperationID): - retryOperationID -case let .suspended(retryOperationID, _): - retryOperationID +case let .attachingDueToRetryOperation(id), + let .detachedDueToRetryOperation(id), + let .suspended(id, _): + id
877-879: Extract sleep duration as a configuration constantThe hardcoded sleep duration of 0.25 seconds should be extracted as a configuration constant for better maintainability.
Consider adding a private constant at the class level:
+private let detachRetryWaitDuration: TimeInterval = 0.25Then use it in the code:
-let waitDuration = 0.25 +let waitDuration = detachRetryWaitDuration
1013-1030: Add error type documentation for error handlingThe error handling in the retry operation could benefit from documentation about the expected error types and their handling.
Consider adding documentation:
// CHA-RL5d +/// Possible errors: +/// - ARTErrorInfo: When the contributor fails to attach +/// - CancellationError: When the operation is cancelled do { try await waitForContributorThatTriggeredRetryToBecomeAttached(triggeringContributor) } catch { // CHA-RL5e logger.log(message: "RETRY's waiting for triggering contributor to attach failed with error \(error). Ending RETRY.", level: .debug) return }
1060-1074: Consider using AsyncThrowingStream for better state handlingThe current implementation might miss state changes due to the race condition mentioned in the TODO comment. Using
AsyncThrowingStreamcould provide better control over the state change handling.Consider refactoring to use
AsyncThrowingStreamfor more reliable state change handling:let stateStream = AsyncThrowingStream<ARTRealtimeChannelState, Error> { continuation in Task { let initialState = await triggeringContributor.channel.state continuation.yield(initialState) for await stateChange in await triggeringContributor.channel.subscribeToState() { continuation.yield(stateChange.current) } } }This approach would ensure you don't miss any state changes between the initial state check and subscription setup.
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (2)
888-1027: Consider adding more documentation for complex test scenarios.While the RETRY operation tests are well-implemented and cover the specifications thoroughly, consider adding more inline documentation to explain:
- The relationship between different test cases
- The expected behavior flow in complex scenarios
- The rationale behind specific test configurations
This would make the test suite more maintainable and easier to understand for other developers.
Example documentation structure:
/// Test suite for the RETRY operation as specified in CHA-RL5 /// /// The tests in this section verify: /// 1. Basic retry behavior (CHA-RL5a) /// 2. Error handling during detachment (CHA-RL5b, CHA-RL5c) /// 3. State transitions and contributor behavior (CHA-RL5d, CHA-RL5e, CHA-RL5f) /// /// The test cases are designed to be independent but build upon each other /// to verify the complete RETRY operation lifecycle.
931-981: Consider extracting common test setup into helper methods.The test setup code for contributor state changes could be refactored into helper methods to improve readability and reduce duplication. For example:
private func setupContributorWithDetachBehavior( callCount: Int, successBehavior: MockRoomLifecycleContributorChannel.AttachOrDetachBehavior = .success, failureBehavior: MockRoomLifecycleContributorChannel.AttachOrDetachBehavior = .failure(.createUnknownError()) ) -> MockRoomLifecycleContributor { let detachImpl = { @Sendable (count: Int) -> MockRoomLifecycleContributorChannel.AttachOrDetachBehavior in if count == callCount { return successBehavior } else { return failureBehavior } } return createContributor( attachBehavior: .success, detachBehavior: .fromFunction(detachImpl) ) }This would simplify test cases like
retry_ifDetachFailsDueToNonFailedChannelState_retries().
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (3)
Sources/AblyChat/RoomLifecycleManager.swift(16 hunks)Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift(17 hunks)Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift(6 hunks)
🧰 Additional context used
📓 Learnings (2)
Sources/AblyChat/RoomLifecycleManager.swift (4)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Sources/AblyChat/RoomLifecycleManager.swift:0-0
Timestamp: 2024-11-12T15:07:31.866Z
Learning: In `RoomLifecycleManager`, handling of unexpected contributor states after attach failure will be addressed in issue #49.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#54
File: Sources/AblyChat/RoomLifecycleManager.swift:0-0
Timestamp: 2024-11-12T15:07:31.866Z
Learning: In `RoomLifecycleManager`, handling of unexpected contributor states after attach failure will be addressed in issue #49.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Sources/AblyChat/RoomLifecycleManager.swift:217-220
Timestamp: 2024-11-12T15:07:31.865Z
Learning: In `RoomLifecycleManager`, handling of missing `stateChange.reason` when `stateChange.resumed` is `false` is being tracked in issue #74. Future reviews should be aware of this planned work.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Sources/AblyChat/RoomLifecycleManager.swift:217-220
Timestamp: 2024-11-12T15:07:31.865Z
Learning: In `RoomLifecycleManager`, handling of missing `stateChange.reason` when `stateChange.resumed` is `false` is being tracked in issue #74. Future reviews should be aware of this planned work.
Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (2)
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift:98-102
Timestamp: 2024-11-12T15:07:31.865Z
Learning: The cleanup of old subscriptions in `MockRoomLifecycleContributorChannel` is acknowledged with a TODO comment and is tracked in issue #36.
Learnt from: lawrence-forooghian
PR: ably-labs/ably-chat-swift#67
File: Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift:98-102
Timestamp: 2024-11-12T15:07:31.865Z
Learning: The cleanup of old subscriptions in `MockRoomLifecycleContributorChannel` is acknowledged with a TODO comment and is tracked in issue #36.
🔇 Additional comments (8)
Tests/AblyChatTests/Mocks/MockRoomLifecycleContributorChannel.swift (4)
7-7: LGTM: Well-structured initialization changes
The new property and initializer parameters are well-designed, maintaining actor isolation and backward compatibility through sensible defaults.
Also applies to: 19-28
60-63: LGTM: Clear and purposeful enum design
The new SubscribeToStateBehavior enum is well-designed with clear, descriptive cases that support different subscription testing scenarios.
113-120: LGTM: Clean implementation of subscription behavior
The switch statement cleanly handles the different subscription behaviors while maintaining the existing subscription management pattern.
Note: The cleanup of subscriptions is already tracked in issue #36 as noted in the existing TODO comment.
89-91: Verify potential for infinite recursion
The recursive behavior handling looks correct, but we should ensure there are tests covering the termination of recursive behavior chains.
✅ Verification successful
Let's analyze the test coverage more broadly to understand how behavior chains are tested, even if they don't explicitly use nested fromFunction calls.
Recursion is safely implemented with proper test coverage
The implementation is safe because:
- The recursive behavior is controlled through test cases in
DefaultRoomLifecycleManagerTests.swiftthat verify behavior chains - The recursion always terminates through
.completeor.completeAndChangeStatecases - Test coverage includes:
- Failure scenarios with state changes
- Multiple sequential operations
- Retry scenarios with controlled iteration counts (e.g., detach operation with 3 attempts)
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for tests that verify recursive behavior chains
rg -l "fromFunction.*fromFunction" --type swift Tests/
Length of output: 56
Script:
#!/bin/bash
# Search for test cases involving behavior chains or recursive behavior
rg -A 10 "performBehavior.*behavior" --type swift Tests/
# Also search for test cases involving function behavior creation
rg -A 10 "fromFunction" --type swift Tests/
Length of output: 12163
Sources/AblyChat/RoomLifecycleManager.swift (3)
184-190: LGTM: New states for RETRY operation
The new states attachingDueToRetryOperation, detachedDueToRetryOperation, and suspended are well-designed to support the RETRY operation lifecycle. The suspended state appropriately includes both the retry operation ID and error information.
201-211: LGTM: Status mappings are consistent
The mappings from internal to public states are logically consistent:
- Both
detachedstates correctly map to.detached attachingDueToRetryOperationappropriately maps to.attaching(error: nil)suspendedcorrectly preserves the error information
972-976:
Handle task cancellation properly
The code uses force_try with a TODO comment about handling task cancellation. This should be addressed to prevent potential crashes.
Apply this fix:
-// TODO: Make this not trap in the case where the Task is cancelled
-// swiftlint:disable:next force_try
-try! await clock.sleep(timeInterval: waitDuration)
+do {
+ try await clock.sleep(timeInterval: waitDuration)
+} catch is CancellationError {
+ logger.log(message: "Sleep was cancelled during retry wait", level: .debug)
+ throw ARTErrorInfo(chatError: .operationCancelled)
+}Likely invalid or redundant comment.
Tests/AblyChatTests/DefaultRoomLifecycleManagerTests.swift (1)
74-78: LGTM: Helper method enhancements look good.
The additions to the createContributor method signature (initialErrorReason and subscribeToStateBehavior) provide good flexibility for testing various contributor states and behaviors.
Also applies to: 84-87
Resolves #51. See commit messages for more details.
Summary by CodeRabbit
New Features
Bug Fixes
Tests