ExceptionLayoutRenderer - Handle Exception properties like StackTrace can throw #5741
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WalkthroughThe pull request updates the Changes
Sequence Diagram(s)sequenceDiagram
participant C as Caller
participant E as ExceptionLayoutRenderer
participant L as Logger
C->>E: Call AppendToString(exception)
E->>E: Initialize exception details
alt Retrieve details successfully
E->>E: Append message, method, stack trace, source
else Error encountered
E->>L: Log warning with concise message
E->>E: Append exception type as fallback
end
alt Inner exception exists
E->>E: Recursively process inner exception
end
E-->>C: Return constructed exception string
Poem
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🧹 Nitpick comments (1)
src/NLog/LayoutRenderers/ExceptionLayoutRenderer.cs (1)
455-462: Error handling added for Source property.The changes properly handle cases where accessing the Source property might throw an exception. However, unlike other similar methods, this one doesn't append the exception type as a fallback when an error occurs.
For consistency with other error handling methods, consider adding the exception type as fallback:
try { sb.Append(ex.Source); } catch (Exception exception) { InternalLogger.Warn(exception, "Exception-LayoutRenderer Could not output Source for Exception: {0}", ex.GetType()); + sb.Append(ex.GetType().ToString()); }
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src/NLog/LayoutRenderers/ExceptionLayoutRenderer.cs(8 hunks)
🔇 Additional comments (7)
src/NLog/LayoutRenderers/ExceptionLayoutRenderer.cs (7)
76-77: LGTM: Clean formatting change on renderingfunctions dictionary.The variable names are consistent and make the code more readable.
352-360: Good error handling for exception message extraction.The try-catch pattern handles cases where accessing an exception's Message property might itself throw an exception. The fallback to showing the exception type provides useful information to the user even when the normal path fails.
371-379: Robust error handling for TargetSite property.The added try-catch block properly handles exceptions that might occur when accessing the TargetSite property. Using the null-conditional operator on TargetSite is a good practice, as this property can be null in certain circumstances (like dynamically generated methods).
389-397: Good defensive programming for StackTrace property.The added try-catch block properly handles cases where accessing an exception's StackTrace property might throw an exception. This improves the robustness of the exception rendering.
407-425: Improved exception handling with fallback rendering.The changes provide a more robust approach to rendering exceptions by:
- Capturing critical properties early to use in the fallback output
- Implementing recursive rendering for inner exceptions when ToString() fails
- Providing a sensible fallback format that includes both type and message
This ensures meaningful output even when the exception's ToString() method fails.
435-436: LGTM: Minor code simplification.The change simplifies the expression by removing unnecessary parentheses while maintaining the same functionality.
505-515: Good error handling for accessing exception data.The changes implement proper error handling when accessing exception data by:
- Storing the data value in a local variable
- Using that variable both for output and for logging in case of error
- Continuing the loop after an error, rather than failing the entire data rendering
This approach correctly handles cases where specific data entries might be problematic while allowing other entries to still be rendered.
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Try to provide minimal fallback when possible.