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; error messages now report connection state information more accurately to help diagnose connection-related issues.

[coderabbitai]

Walkthrough

The attach flow in the Ably realtime channel now caches the connection state in a local variable instead of repeatedly accessing it. The error message reported on validation failure was updated to reflect the actual connection state value rather than the channel state.

Changes

Cohort / File(s)	Summary
Connection State Caching ably/realtime/channel.py	Cache connection state in local variable during attach flow and update error message to report connection state instead of channel state.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A rabbit optimizes the flow,
Caching states high and low,
Error messages now ring so true,
Connection status shining through! 🐰✨

🚥 Pre-merge checks | ✅ 3

✅ 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 'fix: log connection state when unable to attach' accurately describes the main change: improving 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%.

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🧪 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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Review profile: CHILL

Plan: Pro

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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.

[coderabbitai]

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

ably/realtime/channel.py (1)

187-192: ⚠️ Potential issue | 🟡 Minor

Same bug exists here: error message reports channel state but checks connection state.

The detach method has the same issue that was fixed in attach. The condition checks connection.state but the error message incorrectly reports the channel state.

🐛 Proposed fix to match the attach() fix

+        connection_state = self.__realtime.connection.state
         # RTL5g, RTL5b - raise exception if state invalid
-        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
             )

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@ably/realtime/channel.py` around lines 187 - 192, The error raised in
detach() checks self.__realtime.connection.state but the AblyException message
reports the channel state (self.state); update the message in the detach()
AblyException to reflect the connection state (e.g., include
self.__realtime.connection.state) or include both states for clarity so the
message matches the condition checked (refer to detach, attach, AblyException,
self.__realtime.connection.state, self.state).

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Outside diff comments:
In `@ably/realtime/channel.py`:
- Around line 187-192: The error raised in detach() checks
self.__realtime.connection.state but the AblyException message reports the
channel state (self.state); update the message in the detach() AblyException to
reflect the connection state (e.g., include self.__realtime.connection.state) or
include both states for clarity so the message matches the condition checked
(refer to detach, attach, AblyException, self.__realtime.connection.state,
self.state).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d163931c-4d78-41f8-a274-117be35096a9

📥 Commits

Reviewing files that changed from the base of the PR and between 80f347d and 8085a4f.

📒 Files selected for processing (1)

• ably/realtime/channel.py