fix: standardize getSecret sample

[iennae]

Description

Adds consistency; try/catch;

Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• secret-manager/getSecret.js:19, tag secretmanager_get_secret

You are about to delete 1 region tag.

• secret-manager/getSecret.js:18, tag secretmanager_get_secret

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[gemini-code-assist]

Summary of Changes

Hello @iennae, 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 refactors the getSecret sample for Google Cloud Secret Manager to enhance its robustness, consistency, and adherence to best practices. The changes standardize the sample's structure, improve error handling, ensure proper resource cleanup, and make the core function more reusable.

Highlights

• Standardized Function Signature: The getSecret function has been refactored to explicitly accept projectId and secretId as parameters, making it more modular and testable. The main function now handles argument parsing from process.argv and process.env.
• Improved Error Handling: A try/catch block has been added around the client.getSecret call to gracefully handle potential API errors, providing more robust error reporting.
• Resource Management: The SecretManagerServiceClient is now properly closed using await client.close() within a finally block, ensuring efficient resource cleanup regardless of success or failure.
• Enhanced Logging: The sample's output has been refined to provide more informative messages, including specific details about the secret's replication policy or noting its absence.
• Module Export: The getSecret function is now exported via module.exports.getSecret, allowing it to be easily imported and used in other modules or for testing purposes.

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[gemini-code-assist]

Code Review

This pull request refactors the getSecret sample to improve its structure and add error handling, which is a positive change. However, my review identified a critical issue where the changes break existing tests. I've also pointed out a high-severity issue in the error handling logic that could suppress failures and a medium-severity issue regarding missing input validation. I've provided code suggestions to address these points. Once these are resolved, the sample will be much more robust and reliable.

[gemini-code-assist]

There are a couple of issues in the catch block:

1. The error message uses template literal syntax (${name}) inside a single-quoted string. This prevents string interpolation, so the literal text ${name} will be logged instead of the secret's name. To fix this, you should use backticks (`) to create a template literal string.
2. The catch block logs the error but doesn't re-throw it. This causes the getSecret function to implicitly return undefined on failure. When run from the command line, the script will then exit with a success code (0) even though an error occurred. The error should be re-thrown to ensure the process exits with a non-zero status code, correctly indicating failure.

  } catch (err) {
    console.error(`Failed to retrieve secret '${name}':`, err);
    throw err;
  }

[NimJay]

Thanks for doing this, @iennae! Changes look good.
I assume we'll have to re-update the sample (a bit more) once the samples from the "Copy-paste-runnable" workshopping is complete/approved (e.g., to move the client to global scope, etc.).

Ready the merge.