[ECO-4952] Start implementing room lifecycle spec #1
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This is based on [1] at b4a495e. It’s generated some questions, which I’ve asked on that PR. Note that the spec has been through a few revisions since I started implementing this; I’ve tried to keep everything in sync but some older stuff might still be accidentally there. I’ve implemented most of the specified behaviour for the ATTACH, DETACH, and RELEASE operations. I have not yet implemented RETRY since it’s quite different to those three and I wanted to get eyes on this first chunk of work; have created ably#51 for implementing it. Of the operations that I have implemented, I have not implemented the following (this is accurately reflected by the @SPEC… tags in the tests): - Lifecycle behaviour that relates to another ongoing operation (created ably#52) - Lifecycle behaviour relating to “transient disconnect timeouts” (created ably#48) - Lifecycle behaviour that occurs “asynchronously” outside an operation (created ably#50) - CHA-RL1g2, which refers to emitting “discontinuity events” which are a concept not yet implemented; this will come in ably#53. The room lifecycle manager introduced by this commit is currently a standalone object, which is not integrated with the rest of the SDK. I’ve created ably#47 for doing this integration work. The @SPEC… tags are based on the on the JS rules [2] @ 8c9ce8b, but I camel-cased them and also decided that: - if a test doesn't relate to a spec point, it doesn't need any markers - there should be a way to know that a spec point is tested across multiple tests - there should be a way of marking a spec point as implemented but not tested (so that can show up differently in reporting; important given that we’re also going to use this report as a to-do list of what still needs to be implemented) Part of ably#28. [1] ably/specification#200 [2] https://github.com/ably/ably-js/blob/main/CONTRIBUTING.md#tests-alignment-with-the-ably-features-specification
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This is a benchmark review for experiment This pull request was cloned from Experiment configurationreview_config:
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# CodeRabbit examples:
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- https://github.com/2lambda123/galaxyproject-galaxy/pull/12
- https://github.com/a0v0/avtoolz/pull/79
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# Examples where CodeRabbit does not generate diagrams
- https://github.com/baptisteArno/typebot.io/pull/1778
- https://github.com/btipling/foundations/pull/33
- https://github.com/btipling/foundations/pull/31
- https://github.com/chintu-777/jaeger/pull/1
- https://github.com/coji/remix-docs-ja/pull/55
- https://github.com/DaveMBush/SmartNgRX/pull/622
- https://github.com/DaveMBush/SmartNgRX/pull/481
- https://github.com/dkittle/party-connections/pull/6
- https://github.com/Drajad-Kusuma-Adi/onstudy-backend/pull/6
- https://github.com/imaami/libcanth/pull/2
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- https://github.com/agdas/vscode/pull/2
- https://github.com/agluszak/hirschgarten/pull/2
- https://github.com/4DNucleome/PartSeg/pull/1183
- https://github.com/ably/ably-cocoa/pull/1973
- https://github.com/ably-labs/ably-chat-swift/pull/54
- https://github.com/ably-labs/ably-chat-swift/pull/35
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Reviewer's Guide by SourceryThis pull request implements a significant portion of the room lifecycle specification for the Ably Chat SDK. It introduces a new File-Level Changes
Sequence DiagramsATTACH Operation SequencesequenceDiagram
participant Client
participant RLM as RoomLifecycleManager
participant Contributor
Client->>RLM: performAttachOperation()
RLM->>RLM: changeStatus(to: .attaching)
loop For each contributor
RLM->>Contributor: attach()
alt Attach succeeds
Contributor-->>RLM: Success
else Attach fails
Contributor-->>RLM: Error
RLM->>RLM: changeStatus(to: .suspended or .failed)
RLM-->>Client: Throw error
end
end
RLM->>RLM: changeStatus(to: .attached)
RLM-->>Client: Operation complete
DETACH Operation SequencesequenceDiagram
participant Client
participant RLM as RoomLifecycleManager
participant Contributor
Client->>RLM: performDetachOperation()
RLM->>RLM: changeStatus(to: .detaching)
loop For each contributor
RLM->>Contributor: detach()
alt Detach succeeds
Contributor-->>RLM: Success
else Detach fails
Contributor-->>RLM: Error
RLM->>RLM: Retry logic
end
end
alt All detaches successful
RLM->>RLM: changeStatus(to: .detached)
RLM-->>Client: Operation complete
else Any detach failed
RLM->>RLM: changeStatus(to: .failed)
RLM-->>Client: Throw error
end
Tips
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SourceryAI
reviewed
Sep 20, 2024
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Hey @ruancomelli - I've reviewed your changes - here's some feedback:
Overall Comments:
- Consider breaking down some of the larger functions in RoomLifecycleManager (e.g., performAttachOperation, performDetachOperation) into smaller, more focused functions to improve readability and maintainability.
- The error handling approach with custom error types and extensive mapping is complex. Consider exploring a more unified error handling strategy in the future to reduce potential inconsistencies.
Here's what I looked at during the review
- 🟡 General issues: 3 issues found
- 🟡 Documentation: 1 issue found
Help me be more useful! Please click 👍 or 👎 on each comment to tell me if it was helpful.
Comment on lines
+98
to
+107
| switch contributorState { | ||
| case .suspended: | ||
| // CHA-RL1h2 | ||
| let error = ARTErrorInfo(chatError: .attachmentFailed(feature: contributor.feature, underlyingError: contributorAttachError)) | ||
| changeStatus(to: .suspended, error: error) | ||
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| // CHA-RL1h3 | ||
| throw error | ||
| case .failed: | ||
| // CHA-RL1h4 |
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suggestion: Consider creating specific error types for contributor failures
The current approach of catching all errors and then checking the contributor's state could potentially mask important error information. Consider creating specific error types that encapsulate both the error and the resulting state. This would allow for more precise error handling without relying on checking the state after the fact.
| } | ||
| default: | ||
| // CHA-RL2h3: Retry until detach succeeds, with a pause before each attempt | ||
| while true { |
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suggestion: Add a retry limit or timeout for detach operations
The current implementation of retrying detach operations has no upper bound, which could lead to infinite loops in certain edge cases. Consider adding a maximum retry count or a timeout mechanism to ensure the operation eventually terminates, even in failure scenarios.
| // CHA-RL2h1 | ||
| guard let contributorError = await contributor.channel.errorReason else { | ||
| // TODO: The spec assumes this will be populated, but working in a multi-threaded environment means it might not be (https://github.com/ably-labs/ably-chat-swift/issues/49) | ||
| preconditionFailure("Contributor entered FAILED but its errorReason is not set") |
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suggestion: Consider more graceful error handling in release builds
While using preconditionFailure is appropriate for catching programmer errors in debug builds, consider implementing a more graceful handling of these cases in release builds. This could involve falling back to a more general error type or providing a default error reason, ensuring that the application can continue functioning even in unexpected scenarios.
| @@ -28,3 +28,46 @@ To check formatting and code quality, run `swift run BuildTool lint`. Run with ` | |||
| - We should aim to make it easy for consumers of the SDK to be able to mock out the SDK in the tests for their own code. A couple of things that will aid with this: | |||
| - Describe the SDK’s functionality via protocols (when doing so would still be sufficiently idiomatic to Swift). | |||
| - When defining a `struct` that is emitted by the public API of the library, make sure to define a public memberwise initializer so that users can create one to be emitted by their mocks. (There is no way to make Swift’s autogenerated memberwise initializer public, so you will need to write one yourself. In Xcode, you can do this by clicking at the start of the type declaration and doing Editor → Refactor → Generate Memberwise Initializer.) | |||
| - When writing code that implements behaviour specified by the Chat SDK features spec, add a comment that references the identifier of the relevant spec item. | |||
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| ### Testing guidelines | |||
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suggestion (documentation): Consider adding a brief explanation of the purpose of spec tags
It might be helpful to briefly explain why these spec tags are used at the beginning of the 'Attributing tests to a spec point' section. This would provide immediate context for developers.
This was referenced Sep 20, 2024
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Note: This is based on top of ably#60; please review that one first.
This is based on ably/specification#200 at
b4a495e. It’s generated some questions, which I’ve asked on that PR.Note that the spec has been through a few revisions since I started implementing this; I’ve tried to keep everything in sync but some older stuff might still be accidentally there.
I’ve implemented most of the specified behaviour for the
ATTACH,DETACH, andRELEASEoperations. I have not yet implementedRETRYsince it’s quite different to those three and I wanted to get eyes on this first chunk of work; have created ably#51 for implementing it.Of the operations that I have implemented, I have not implemented the following (this is accurately reflected by the
@spec…tags in the tests):RETRYoperation where spec says to ably/ably-chat-swift#50)The room lifecycle manager introduced by this commit is currently a standalone object, which is not integrated with the rest of the SDK. I’ve created ably#47 for doing this integration work.
The
@spec…tags are based on the on the JS rules @8c9ce8b, but I camel-cased them and also decided that:Part of ably#28.
Summary by CodeRabbit
New Features
RoomLifecycleManagerto manage chat room contributor states effectively.SimpleClockprotocol to facilitate asynchronous task management in testing.RoomLifecycleContributorChannelfor testing purposes.Bug Fixes
Tests
RoomLifecycleManagerto ensure robust lifecycle management of chat rooms.