Distinguish between Mezmo error vs no logs for specified time period

[dthaler]

Summary by CodeRabbit

• Bug Fixes

  • Enhanced error handling for service key configuration issues, allowing for more robust null value management.
  • Updated methods to return null instead of empty strings when data retrieval fails.

• New Features

  • Improved logging and error reporting for JSON responses, particularly when certain properties may be absent.

[coderabbitai]

Walkthrough

The changes in the MezmoFetcher class focus on updating method return types to nullable strings, enhancing error handling, and improving robustness in managing potential null values. The method GetMezmoDataAsync now returns string?, allowing for null returns in specific error scenarios. Similar adjustments are made in related methods, with checks for empty strings replaced by checks for null. Error handling has been refined to avoid unnecessary logging when certain properties are absent in JSON responses.

Changes

File Path	Change Summary
OrcanodeMonitor/Core/MezmoFetcher.cs	- Updated GetMezmoDataAsync to return string? instead of string.
	- Adjusted error handling to return null instead of an empty string.
	- Modified GetMezmoRecentLogAsync, UpdateMezmoHostsAsync, and UpdateMezmoViewsAsync to handle nullable strings.
	- Refined error handling in UpdateMezmoViewsAsync to not log errors for missing hosts property.

Possibly related PRs

• Add Mezmo state tracking #161: This PR introduces new methods for Mezmo API interactions, including GetMezmoDataAsync, which is directly related to the changes made in the MezmoFetcher class regarding the handling of nullable return types.
• Generate Mezmo events #162: This PR modifies the GetMezmoRecentLogAsync method, which is relevant as it also deals with the Mezmo API and includes updates to the method that the main PR changes, specifically regarding return types and error handling.
• Add logging for HTTP failures #179: This PR removes Mezmo-related functionality from the Fetcher class, which is relevant as it indicates changes in the handling of Mezmo data that could impact the overall architecture and error handling in the MezmoFetcher class.

Poem

🐇 In the land of code where rabbits play,
Nullable strings brighten the day.
Errors now handled with care and delight,
Fetching data, all feels just right!
Hops of joy with each new return,
In the world of Mezmo, we happily learn! 🌼

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📜 Recent review details

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Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between acbf4d8 and 42bc0dc.

📒 Files selected for processing (1)

• OrcanodeMonitor/Core/MezmoFetcher.cs (6 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• OrcanodeMonitor/Core/MezmoFetcher.cs

---

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[coderabbitai]

Actionable comments posted: 2

🧹 Outside diff range and nitpick comments (1)

OrcanodeMonitor/Core/MezmoFetcher.cs (1)

85-86: Consider adding more descriptive error logging.

While the error handling is correct, consider adding more context to help diagnose issues when GetMezmoDataAsync returns null. This could include the URL being queried and the time range.

-                if (jsonString == null)
-                {
-                    // Error.
-                    return null;
-                }
+                if (jsonString == null)
+                {
+                    logger.LogDebug($"Failed to fetch Mezmo logs for {node.S3NodeName} between {from} and {to}");
+                    return null;
+                }

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between 7becca2 and acbf4d8.

📒 Files selected for processing (1)

• OrcanodeMonitor/Core/MezmoFetcher.cs (6 hunks)

🔇 Additional comments (2)

OrcanodeMonitor/Core/MezmoFetcher.cs (2)

36-36: LGTM: Improved error handling with nullable return type.

The changes enhance error handling by clearly distinguishing between Mezmo errors (returning null) and empty responses (returning empty string). This aligns with C# best practices and the PR's objective.

Also applies to: 44-44, 63-63

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261-261: LGTM: Improved error handling for views without hosts.

Good change to not log an error when a view doesn't have hosts, as this is an expected case for certain view types.