[ECO-5117] Fix channel ATTACH/DETACH state checks #1046

sacOO7 · 2024-11-20T12:41:14Z

Summary by CodeRabbit

New Features
- Enhanced channel state management during attachment and detachment operations.
- Improved handling for channel states such as failed and suspended.
Bug Fixes
- Resolved issues related to publishing messages when the channel is in a failed or suspended state.
Tests
- Added new test cases to validate channel behavior in various states, ensuring robust testing of attachment and detachment functionalities.

coderabbitai · 2024-11-20T12:41:21Z

Walkthrough

The changes in this pull request involve modifications to the ChannelBase class and its associated test suite, RealtimeChannelTest. The primary focus is on improving the handling of channel states during attach and detach operations, specifically addressing the failed and suspended states. The attachImpl and detachImpl methods have been updated for better state management, and new unit tests have been added to validate these behaviors.

Changes

File	Change Summary
`lib/src/main/java/io/ably/lib/realtime/ChannelBase.java`	- Enhanced state handling in `attachImpl` and `detachImpl` methods for `failed` and `suspended` states. - Updated `setState` method for state transitions. - Modified `publish` methods to check channel states.
`lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java`	- Added new tests for channel attachment and detachment in `failed` and `suspended` states. - Refined assertions in existing tests for clarity.

Assessment against linked issues

Objective	Addressed	Explanation
Implement handling for `suspended` and `failed` states during attach/detach (1045, ECO-5117)	✅
Add unit tests for channel state management during attach/detach (1045, ECO-5117)	✅

Possibly related PRs

Fix implicit attach on subscribe #1028: This PR modifies the ChannelBase class to enhance subscription functionality, which is closely related to the changes in the main PR that also focus on channel state management during attachment and detachment.
[ECO-4972] Fix implicit channel ATTACH #1043: This PR addresses issues related to channel attachment and subscription, including updates to the RealtimeChannelTest class that enhance testing for channel states, aligning with the main PR's focus on state management in the ChannelBase class.

Suggested reviewers

ttypic

Poem

In the channels where we play,
States now dance in a new way.
Failed or suspended, fear not,
Attach and detach, give it a shot!
With tests to guard our joyful spree,
Robust and clear, we hop with glee! 🐇✨

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coderabbitai

Actionable comments posted: 3

🧹 Outside diff range and nitpick comments (1)

lib/src/main/java/io/ably/lib/realtime/ChannelBase.java (1)

Line range hint 948-950: Address the TODO comment regarding test failure in setConnected

The setConnected method contains a TODO comment indicating a failing test due to explicit attach after connect. Investigate and resolve this issue to ensure that the channel correctly reattaches when the connection is reestablished, adhering to RTN15c6 and RTN15c7 specifications.

Would you like assistance in diagnosing the test failure or updating the test to reflect the intended behavior?

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Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between dc4d464 and ec5b6dd.

📒 Files selected for processing (2)

lib/src/main/java/io/ably/lib/realtime/ChannelBase.java (2 hunks)
lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java (3 hunks)

🔇 Additional comments (5)

lib/src/main/java/io/ably/lib/realtime/ChannelBase.java (5)

224-236: Verify handling of 'failed' state during attach

In the attachImpl method, when the channel state is failed, the code sets this.reason = null; and proceeds without explicitly initiating a new attach operation. Ensure that this approach aligns with the RTL4g specification, which states that the channel should proceed as if it were in the initialized state when attach is called on a failed channel.

317-322: Confirm success callback for 'initialized' and 'detached' states in detach

In the detachImpl method, when the channel state is initialized or detached, the code calls callCompletionListenerSuccess(listener);. Verify that returning success in these states is appropriate and consistent with the RTL5a specification.

322-330: Handle pending detach requests in 'detaching' and 'attaching' states

The code adds the listener to the channel's state change listeners when the state is detaching, and queues the detach request when the state is attaching. Ensure that this logic correctly handles concurrent detach operations as specified in RTL5i.

330-334: Appropriate error callback for 'failed' state during detach

In the detachImpl method, when the channel state is failed, the code constructs an ErrorInfo object based on this.reason and calls callCompletionListenerError(listener, error);. This behavior aligns with the RTL5b specification, which expects an error when detaching a channel in a failed state.

335-338: Transition from 'suspended' to 'detached' during detach

When the channel state is suspended, the code transitions the state to detached by calling setState(ChannelState.detached, null); and then invokes callCompletionListenerSuccess(listener);. This complies with the RTL5j specification, ensuring proper state management during detach operations from a suspended state.

lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java

ttypic

LGTM

coderabbitai

Actionable comments posted: 0

🧹 Outside diff range and nitpick comments (2)

lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java (2)
1071-1106: Good test coverage for detach in suspended state.

The test effectively verifies channel detach behavior when in suspended state. Consider adding a verification that channel.reason is null after successful detach, similar to the attach test.
 /* Verify onSuccess callback gets called */
 detachWaiter.waitFor();
 assertTrue(detachWaiter.success);
+assertNull("Verify error reason is cleared", channel.reason);
1108-1147: Comprehensive test for detach failure in failed state.

Good validation of error conditions and state transitions. Consider adding a test case for the scenario where the channel moves from failed to attached state while a detach operation is pending.
@Test
public void detach_pending_when_channel_moves_to_attached() {
    // Setup code...
    
    // Simulate connection failure
    ably.connection.connectionManager.requestState(ConnectionState.failed);
    channelWaiter.waitFor(ChannelState.failed);
    
    // Start detach operation
    Helpers.CompletionWaiter detachWaiter = new Helpers.CompletionWaiter();
    channel.detach(detachWaiter);
    
    // Move channel to attached state
    ably.connection.connectionManager.requestState(ConnectionState.connected);
    channelWaiter.waitFor(ChannelState.attached);
    
    // Verify detach operation completes successfully
    detachWaiter.waitFor();
    assertTrue(detachWaiter.success);
}

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between ec5b6dd and 47cd42f.

📒 Files selected for processing (1)

lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java (3 hunks)

🔇 Additional comments (2)

lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java (2)

933-933: LGTM! Improved assertion message clarity.

The updated assertion message better describes the expected state.

947-998: Well structured test for channel attach in failed state.

Good test coverage that:

Properly simulates connection failure
Verifies state transitions (attached -> failed -> attaching -> attached)
Validates error information
Checks cleanup of error reason after reattach

sacOO7 · 2024-11-20T15:02:02Z

@coderabbitai resolve

coderabbitai · 2024-11-20T15:02:12Z

✅ Actions performed

Comments resolved.

Added missing channel state check cases for attach and detach

145e254

github-actions bot temporarily deployed to staging/pull/1046/features November 20, 2024 12:42 Inactive

github-actions bot temporarily deployed to staging/pull/1046/javadoc November 20, 2024 12:43 Inactive

github-actions bot temporarily deployed to staging/pull/1046/features November 20, 2024 13:17 Inactive

sacOO7 requested a review from ttypic November 20, 2024 13:18

sacOO7 marked this pull request as ready for review November 20, 2024 13:18

github-actions bot temporarily deployed to staging/pull/1046/javadoc November 20, 2024 13:19 Inactive

coderabbitai bot reviewed Nov 20, 2024

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ttypic approved these changes Nov 20, 2024

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Added tests for channel state checks before attach and detach operations

47cd42f

sacOO7 force-pushed the fix/channel-state-checks-before-detach-attach branch from ec5b6dd to 47cd42f Compare November 20, 2024 14:52

github-actions bot deployed to staging/pull/1046/features November 20, 2024 14:53 View deployment

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sacOO7 merged commit 17624ce into main Nov 20, 2024
11 checks passed

sacOO7 deleted the fix/channel-state-checks-before-detach-attach branch November 20, 2024 18:10

coderabbitai bot mentioned this pull request Dec 5, 2024

[ECO-5163] fix: duplicated messages because of duplicated attach message #1052

Merged

coderabbitai bot mentioned this pull request Dec 16, 2024

[RTL13] Fix existing impl. for server sent DETACH #1054

Merged

coderabbitai bot mentioned this pull request Mar 14, 2025

[ECO-5246] fix: Realtime Client Reconnection Logic #1077

Merged

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[ECO-5117] Fix channel ATTACH/DETACH state checks #1046

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