fix: log connection state when unable to attach

[owenpearson]

this log was unhelpfully printing the channel state when it's actually the connection state preventing the channel from attaching

Summary by CodeRabbit

• Bug Fixes
  • Improved error messaging when channel attachment fails to display the relevant connection state, providing better diagnostic information for troubleshooting connection issues.

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[coderabbitai]

Walkthrough

A local variable connection_state is introduced to cache the connection state, replacing repeated direct accesses to self.__realtime.connection.state. The error message for attachment failures is updated to display the connection state rather than the channel state for clarity.

Changes

Cohort / File(s)	Summary
Connection state caching and error message refinement ably/realtime/realtime_channel.py	Introduced local variable to store connection state; replaced direct state accesses with variable references; updated error message to report connection state instead of channel state during attachment failures.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

• Single file with homogeneous, focused changes
• Clear optimization pattern (variable caching)
• Verify error message accuracy reflects intended behavior
• Confirm no unintended side effects from state access pattern change

Poem

A rabbit hops through channels fair, ✨
Caching states with utmost care,
No more repeated lookups slow,
Error messages now brightly glow,
Connection truths we now declare! 🐰

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: fixing error logging to report connection state instead of channel state when attachment fails.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-attach-error-logging

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

ably/realtime/realtime_channel.py (1)

240-245: Consider applying the same fix to the detach() method.

Similar to the issue fixed in attach(), this error message shows the channel state when the condition is actually checking the connection state. For consistency and clarity, consider updating this to show the connection state instead.

Apply this diff to align with the fix in attach():

+        connection_state = self.__realtime.connection.state
-        if self.__realtime.connection.state in [ConnectionState.CLOSING, ConnectionState.FAILED]:
+        if connection_state in [ConnectionState.CLOSING, ConnectionState.FAILED]:
             raise AblyException(
-                message=f"Unable to detach; channel state = {self.state}",
+                message=f"Unable to detach channel; connection state = {connection_state}",
                 code=90001,
                 status_code=400
             )

📜 Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 82e16dc and 80f347d.

📒 Files selected for processing (1)

• ably/realtime/realtime_channel.py (1 hunks)

🧰 Additional context used

🧬 Code graph analysis (1)

ably/realtime/realtime_channel.py (4)

ably/realtime/realtime.py (1)

• connection (132-134)

ably/realtime/connection.py (2)

• state (109-111)
• state (120-121)

ably/realtime/connectionmanager.py (1)

• state (765-766)

ably/types/connectionstate.py (1)

• ConnectionState (8-16)

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🔇 Additional comments (1)

ably/realtime/realtime_channel.py (1)

186-193: LGTM! Error message now correctly reflects the connection state.

The changes properly address the issue where the error message was showing the channel state instead of the connection state that was actually preventing the attach. Caching the connection state also improves consistency and avoids multiple property accesses.