Cleanup error handling

[ardatan]

• Remove ParserCacheError and use PipelineError
• Remove From<Arc<XError>> implementations in favor of the below
• So that I could remove the extra casts and mappings
• Introduce PipelineErrorArc to support Arc<PipelineError> result from or_try_insert_with calls from parsing, planning, validation and normalization
• Remove unused ParseCacheEntry.try_new

[gemini-code-assist]

Summary of Changes

Hello, 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 error handling mechanisms within the router's pipeline, primarily focusing on consolidating error types and simplifying their propagation. The changes aim to reduce boilerplate code associated with error conversions, especially when dealing with Arc wrapped errors from caching operations, leading to a cleaner and more idiomatic Rust error handling pattern.

Highlights

• Error Type Consolidation: The ParserCacheError enum has been removed, and its error variants are now directly represented within the PipelineError enum, simplifying error propagation.
• Simplified Error Conversion: The From<Arc<XError>> implementations have been removed in favor of direct #[from] attributes on PipelineError variants, allowing for more straightforward error conversion without manual mapping or cloning Arcs.
• Introduction of PipelineErrorArc: A new PipelineErrorArc variant has been added to PipelineError to gracefully handle Result<Arc<PipelineError>> outcomes from caching mechanisms, ensuring consistent error wrapping.
• Streamlined Cache Error Handling: Error handling logic within or_try_insert_with calls in parser, normalizer, and planner caches has been simplified by removing explicit map_err(PipelineError::from) and leveraging direct error conversion.

Changelog

• bin/router/src/pipeline/error.rs
  • Added MinifyError import from graphql_tools::parser::query.
  • Updated FailedToParseOperation, FailedToMinifyParsedOperation, NormalizationError, and PlannerError variants in PipelineError to directly accept their respective error types without Arc wrapping, and added #[from] attributes where appropriate.
  • Removed the ParserCacheError enum and its impl From<Arc<ParserCacheError>> for PipelineError block.
  • Introduced a new PipelineErrorArc variant to PipelineError to wrap Arc<PipelineError>.
  • Modified graphql_error_code, graphql_error_message, and default_status_code methods to handle the new PipelineErrorArc variant.
• bin/router/src/pipeline/normalize.rs
  • Removed the NormalizationError import.
  • Removed the explicit type annotation ::<_, NormalizationError> from or_try_insert_with.
  • Removed the .map_err(PipelineError::from) call after or_try_insert_with(...).await.
  • Applied the ? operator directly to the result of or_try_insert_with(...).await.
• bin/router/src/pipeline/parser.rs
  • Removed the ParserCacheError import.
  • Removed the ParseCacheEntry::try_new associated function.
  • Removed the explicit type annotation ::<_, ParserCacheError> from or_try_insert_with.
  • Changed error returns from ParserCacheError::ValidationErrors to PipelineError::ValidationErrors.
  • Changed error returns from ParserCacheError::ParseError(Arc::new(err)) to err.into().
  • Replaced map_err with inspect_err for minify_query calls, allowing MinifyError to be directly converted via #[from].
  • Removed the .map_err(PipelineError::from) call after or_try_insert_with(...).await.
• bin/router/src/pipeline/query_plan.rs
  • Removed the .map(Arc::new) and .map_err(PipelineError::from) calls after plan_from_normalized_operation.
  • Applied the ? operator directly to the result of plan_from_normalized_operation and wrapped the successful outcome in Ok(query_plan.into()).
• lib/graphql-tools/src/parser/query/mod.rs
  • Exported MinifyError from the minify module.

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[gemini-code-assist]

Code Review

This pull request refactors the error handling logic by removing the ParserCacheError and several From<Arc<...>> implementations. It simplifies the code by leveraging #[from] attributes and the ? operator for more idiomatic error propagation. A new PipelineErrorArc variant was introduced to handle errors from the caching layer. The changes have been applied consistently across the parsing, normalization, and query planning stages. The code is correct and I have no suggestions for improvement.

[github-actions]

🐋 This PR was built and pushed to the following Docker images:

Image Names: ghcr.io/graphql-hive/router

Platforms: linux/amd64,linux/arm64

Image Tags: ghcr.io/graphql-hive/router:pr-844 ghcr.io/graphql-hive/router:sha-79dd45d

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[dotansimha]

can you please explain why we need PipelineErrorArc? why not put the Arc on higher level?

[ardatan]

What do you mean?

[dotansimha]

What part in the code makes us needing this kind or error?
It's a bit weird to be that we have PipelineError and then inside we have a variant named PipelineErrorArc that holds Arc<PipelineError>, why not just use Arc<PipelineError> in the relevant places instead?

[ardatan]

Inside the pipeline, for example the parser part of the pipeline impl, we have or_try_insert_with that is called if cache miss. But the return value is always Arc even if Error. So when it fails, it returns Arc in this case. But the actual error type is PipelineError in the flow. So I added this variant to catch Arc ones too.

[dotansimha]

I wonder if that's really needed in this case. When you have Arc<Error>, you can still do ? on it, so what the reason to have special handling for the Arc<Error>? 🤔

[ardatan]

Arc is different than Error unfortunately :/ So it is considered as a different kind. That's why i put a variant for it with "from"