Hjiang/adpat error #51
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Summary of Changes
Hello @dentiny, 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!
I've updated the moonlink crate to adopt the snafu error handling library. This change aims to improve the clarity and debuggability of errors by providing more structured error types and automatically capturing contextual information like file paths and line numbers. The primary impact is a more robust and easier-to-diagnose error reporting system within the moonlink component.
Highlights
- New Error Handling Crate: I've introduced the
snafucrate into the project, which is a Rust library designed to simplify error handling by providing macros for defining custom error types with rich context and location information. - Error Enum Refactoring: The core
moonlink::Errorenum has been refactored to leveragesnafu's capabilities. This includes updating error variants to use#[snafu(display(...))]for formatted messages and structuring error fields to hold relevant data, such as IDs or messages, directly within the error type. - Snafu Demonstration and Testing: To demonstrate the new error handling approach, I've added a new
SnafuErrorenum and a test function (failed_file_creation) that showcases how to usesnafuto create and propagate errors with source context and file location information. - Enhanced Error Context with Location: I've integrated the
location!macro fromsnafuinto an existing error creation point withintable_handler.rs, specifically forIcebergMessageerrors. This ensures that when such an error occurs, it automatically includes the file and line number where it was created, aiding in debugging.
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Code Review
This pull request successfully migrates the error handling from thiserror to snafu, which is a great improvement for creating more structured and context-rich errors. The changes are generally well-implemented. I've provided a few suggestions to make the snafu usage more idiomatic and to improve code organization by separating test-only code from production modules. These changes should help reduce boilerplate and improve maintainability.
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| #[error("UTF-8 conversion error: {0}")] | ||
| Utf8(#[from] std::string::FromUtf8Error), | ||
| #[snafu(display("UTF-8 conversion error: {source}"))] |
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Instead of adding a manual impl From<FromUtf8Error> for Error on lines 55-59, you can leverage snafu's from attribute to generate it automatically. This is more idiomatic and reduces boilerplate code. You can then remove the manual impl block.
| #[snafu(display("UTF-8 conversion error: {source}"))] | |
| #[snafu(display("UTF-8 conversion error: {source}"), from(std::string::FromUtf8Error))] |
| ////////========== | ||
| #[derive(Clone, Debug, Snafu)] | ||
| pub enum SnafuError { | ||
| #[snafu(display("Unable to create file {}", path.display()))] | ||
| TestError { | ||
| source: Arc<std::io::Error>, | ||
| path: std::path::PathBuf, | ||
| location: Location, | ||
| }, | ||
| } | ||
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| pub type SnafuResult<T> = result::Result<T, SnafuError>; | ||
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| impl SnafuError { | ||
| pub fn io_error(source: std::io::Error, path: impl Into<PathBuf>, location: Location) -> Self { | ||
| SnafuError::TestError { | ||
| source: Arc::new(source), | ||
| path: path.into(), | ||
| location, | ||
| } | ||
| } | ||
| } |
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This SnafuError enum and its implementation appear to be for testing purposes only. To keep production code clean and maintainable, it's best to move test-specific code into test modules or behind a test-utils feature flag. Consider moving this to the tests module in src/moonlink/src/storage/io_utils.rs where it's used.
| /// Util function to test snafu error. | ||
| pub(crate) async fn failed_file_creation() -> SnafuResult<()> { | ||
| let mut file = tokio::fs::File::create("/tmp/non_existent_dir/example.txt") | ||
| .await | ||
| .map_err(|e| SnafuError::io_error(e, "/path", location!()))?; | ||
| Ok(()) | ||
| } |
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This function failed_file_creation is only used for testing but is defined in the main module. It should be moved into the #[cfg(test)] mod tests { ... } block below to separate test code from production code.
Summary
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