fix: add catch for get conn exception #13

killagu · 2025-10-23T12:11:52Z

Summary by CodeRabbit

Improvements
- Enhanced connection timeout handling with diagnostic logging. Connections are now properly released during timeout scenarios to prevent resource leaks and improve visibility into connection issues.

gemini-code-assist · 2025-10-23T12:12:05Z

Summary of Changes

Hello @killagu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the robustness of database connection handling by introducing a dedicated mechanism to catch and log promise rejections that occur when acquiring a connection times out. It integrates the onelogger library to facilitate this logging, ensuring that connection failures are gracefully handled and reported without leading to unhandled promise rejection errors.

Highlights

Dependency Addition: The onelogger library has been added as a new dependency in package.json.
Improved Error Handling: A .catch block has been introduced for connection promises within the RDSClient to explicitly handle rejections that occur after a timeout. This prevents unhandled promise rejections and logs a warning with an enriched error message using the newly integrated onelogger.

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coderabbitai · 2025-10-23T12:12:23Z

Note

Other AI code review bot(s) detected

CodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review.

Walkthrough

Introduces the onelogger package as a dependency and integrates logging into the connection timeout handling flow in the client module. When a connection promise resolves after timeout, the code now releases the connection and logs a warning before throwing the timeout error.

Changes

Cohort / File(s)	Summary
Dependency addition `package.json`	Added onelogger (^1.0.0) to project dependencies
Logging integration `src/client.ts`	Imported getLogger from onelogger; modified getConnectionWithTimeout to release connection, log timeout warning, and then throw PoolWaitTimeoutError

Sequence Diagram

sequenceDiagram
    participant Caller
    participant getConnectionWithTimeout
    participant Pool
    participant Logger
    
    Caller->>getConnectionWithTimeout: Request connection with timeout
    getConnectionWithTimeout->>Pool: Acquire connection
    
    alt Timeout occurs first
        getConnectionWithTimeout->>Logger: Log warning via getLogger
        getConnectionWithTimeout->>Pool: conn.release()
        getConnectionWithTimeout->>Caller: throw PoolWaitTimeoutError
    else Connection acquired within timeout
        getConnectionWithTimeout->>Caller: Return connection
    end

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A logger hops in, with onelogger's glow,
When connections time out, now warnings will flow,
Release and log true, the timeout's confessed,
This rabbit's proud code is properly dressed! 🌟

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run `@coderabbitai generate docstrings` to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title "fix: add catch for get conn exception" refers to a real aspect of the changeset—the pull request does add improved handling for connection exceptions in the timeout scenario. However, the title is only partially related to the main changes, which include adding the onelogger dependency for logging infrastructure and implementing connection cleanup (via conn.release()) alongside the exception handling. The term "catch" is somewhat imprecise since the actual implementation appears to be enhancing timeout handling with logging and cleanup rather than adding a traditional try-catch block. While the title conveys that connection exception handling was improved, it doesn't capture the full scope of the changes or the significance of the logging addition.

✨ 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 pick/fix/handle_reject

📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between a1a801d and c17dbe0.

📒 Files selected for processing (2)

package.json (1 hunks)
src/client.ts (2 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

GitHub Check: Node.js / Test (ubuntu-latest, 22, mysql@8)
GitHub Check: Node.js / Test (ubuntu-latest, 20, mysql@9)

🔇 Additional comments (2)

src/client.ts (1)

6-6: LGTM!

The import statement is correct and properly integrates the onelogger dependency.

package.json (1)

22-22: The onelogger package is legitimate and has no known vulnerabilities.

The package exists on npm with version 1.0.1, has an MIT license, is hosted on GitHub (node-modules/onelogger), and has no reported security advisories.

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socket-security · 2025-10-23T12:12:58Z

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	onelogger@1.0.1

View full report

gemini-code-assist

Code Review

This pull request correctly addresses a potential unhandledRejectionError by adding a .catch block to handle connection failures that occur after a timeout. This is a good fix for improving the robustness of the connection logic. My review includes one suggestion to refine the error logging by avoiding mutation of the error object, which is a better practice for debugging and maintainability. I also recommend adding a regression test for this specific race condition to prevent future issues.

gemini-code-assist · 2025-10-23T12:13:32Z

src/client.ts

+        e.message = 'get conn failed after timeout: ' + e.message;
+        logger.warn(e);


Mutating the original error object by modifying its message property is generally considered an anti-pattern. It can obscure the original error source and make debugging more difficult. A better approach is to log the additional context along with the original error, without changing it. This makes logs clearer and preserves the original error information for easier debugging.

Suggested change

e.message = 'get conn failed after timeout: ' + e.message;

logger.warn(e);

logger.warn(`get conn failed after timeout. Original error: ${e.message}`, e);

codecov · 2025-10-23T12:15:27Z

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.21%. Comparing base (a1a801d) to head (c17dbe0).

Files with missing lines	Patch %	Lines
src/client.ts	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
- Coverage   98.46%   98.21%   -0.25%     
==========================================
  Files          10       10              
  Lines        1174     1179       +5     
  Branches      240      240              
==========================================
+ Hits         1156     1158       +2     
- Misses         18       21       +3

☔ View full report in Codecov by Sentry.
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killagu added 2 commits October 23, 2025 20:03

fix: add catch for get conn exception

acea9f9

fix: add catch for get conn exception

93e75cb

killagu changed the title ~~Pick/fix/handle reject~~ fix: add catch for get conn exception Oct 23, 2025

Merge branch 'master' into pick/fix/handle_reject

b81393f

f

c17dbe0

gemini-code-assist bot reviewed Oct 23, 2025

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fix: add catch for get conn exception #13

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killagu commented Oct 23, 2025 •

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		e.message = 'get conn failed after timeout: ' + e.message;
		logger.warn(e);

	e.message = 'get conn failed after timeout: ' + e.message;
	logger.warn(e);
	logger.warn(`get conn failed after timeout. Original error: ${e.message}`, e);

fix: add catch for get conn exception #13

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