refactor: standardize error handling in Bifrost HTTP transport

[Pratham-Mishra04]

Standardize error handling in Bifrost HTTP transport

This PR improves error handling in the Bifrost HTTP transport by:

1. Creating a consistent error response format using BifrostError objects
2. Adding a newBifrostError helper function to wrap standard errors
3. Implementing a shared handleBifrostError function for consistent error response formatting
4. Replacing direct error string responses with structured error objects
5. Preserving error status codes when available from the error object

These changes make error responses more consistent across the API and provide better context about the nature of errors, improving debuggability while maintaining backward compatibility with existing error handling.

[Pratham-Mishra04]

• refactor: standardize error handling in Bifrost HTTP transport #101 👈 (View in Graphite)
• feat: added mcp to http transport #100
• feat: add core-chatbot test application with MCP integration #99
• feat: added MCP support #94
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[coderabbitai]

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Summary by CodeRabbit

• Refactor
  • Unified and standardized error responses, ensuring all errors are now returned in a consistent JSON format.
  • Improved error messages for better clarity and user understanding when issues occur.
• Bug Fixes
  • Addressed inconsistencies in error handling to provide more reliable and informative error responses.

Summary by CodeRabbit

• Refactor
  • Improved and standardized error handling for HTTP endpoints, resulting in more consistent error responses across the application.
• Bug Fixes
  • Error responses now reliably include status codes and detailed messages in a uniform JSON format.

Walkthrough

Error handling in the Bifrost HTTP transport layer was refactored to centralize and standardize error response formatting. New helper functions were introduced for constructing and sending error responses, and existing handler methods were updated to use these helpers, ensuring consistent error semantics and HTTP status code management throughout the codebase.

Changes

File(s)	Change Summary
transports/bifrost-http/integrations/utils.go	Refactored error handling: introduced newBifrostError helper, updated sendError method signature and logic.
transports/bifrost-http/main.go	Refactored error handling in handlers: added handleBifrostError helper and updated usage in handlers.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant HTTPHandler
    participant ErrorHelper

    Client->>HTTPHandler: Sends HTTP request
    HTTPHandler->>HTTPHandler: Processes request
    alt Error occurs
        HTTPHandler->>ErrorHelper: newBifrostError(err, message)
        ErrorHelper-->>HTTPHandler: *schemas.BifrostError
        HTTPHandler->>HTTPHandler: sendError(ctx, bifrostErr)
        HTTPHandler->>Client: Sends JSON error response
    else Success
        HTTPHandler->>Client: Sends normal response
    end

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Suggested reviewers

• akshaydeo
• danpiths

Poem

A rabbit hops through code so neat,
Wrapping errors, no defeat!
Helpers gather, errors blend,
Status codes and JSON send.
Now responses all align—
Bifrost’s errors, clear and fine!
🐇✨

---

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📥 Commits

Reviewing files that changed from the base of the PR and between d807856 and a97d91a.

📒 Files selected for processing (2)

• transports/bifrost-http/integrations/utils.go (6 hunks)
• transports/bifrost-http/main.go (4 hunks)

✨ Finishing Touches

• 📝 Generate Docstrings

🧪 Generate Unit Tests

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• Commit Unit Tests in branch 06-19-enhacement_improved_error_handling_in_http_transport

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Actionable comments posted: 2

📜 Review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2c4a2ab and 4dd1f97.

📒 Files selected for processing (3)

• transports/README.md (1 hunks)
• transports/bifrost-http/integrations/utils.go (5 hunks)
• transports/bifrost-http/main.go (2 hunks)

🧰 Additional context used

🧠 Learnings (2)

📓 Common learnings

Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#94
File: core/bifrost.go:823-845
Timestamp: 2025-06-18T15:15:51.303Z
Learning: In the Bifrost project, the team prioritizes maintaining consistent error handling patterns over exposing detailed error context. All errors should be wrapped in the standard `BifrostError` structure rather than creating specific error types or exposing richer error details like exit codes or stderr output.

transports/bifrost-http/integrations/utils.go (3)

Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#67
File: transports/bifrost-http/integrations/anthropic/router.go:26-34
Timestamp: 2025-06-10T11:19:29.604Z
Learning: The Generic router in transports/bifrost-http/integrations/utils.go already handles nil pointers from RequestConverter functions. When a RequestConverter returns a nil *schemas.BifrostRequest, the Generic router automatically returns an HTTP 400 error with "Invalid request" message, making additional nil checks in individual router implementations redundant.

Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#67
File: transports/bifrost-http/integrations/anthropic/router.go:26-34
Timestamp: 2025-06-10T11:19:29.604Z
Learning: The Generic router in transports/bifrost-http/integrations/utils.go already handles nil pointers from RequestConverter functions. When a RequestConverter returns a nil *schemas.BifrostRequest, the Generic router automatically returns an HTTP 400 error, making additional nil checks in individual router implementations redundant.

Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#80
File: plugins/maxim/main.go:249-264
Timestamp: 2025-06-14T06:17:54.426Z
Learning: In the BifrostError struct, the Error field is a struct (not a pointer), so accessing bifrostErr.Error.Message, bifrostErr.Error.Code, and bifrostErr.Error.Type is safe without nil checks on the Error field itself. The Code and Type fields are of type *string.

🪛 golangci-lint (1.64.8)

transports/bifrost-http/main.go

351-351: Error return value of (*encoding/json.Encoder).Encode is not checked

(errcheck)

transports/bifrost-http/integrations/utils.go

201-201: Error return value of (*encoding/json.Encoder).Encode is not checked

(errcheck)

🔇 Additional comments (4)

transports/README.md (1)

409-409: LGTM! Good catch on the grammatical error.

The typo fix correctly changes "to attached these plugins" to "to attach these plugins," improving the documentation's readability.

transports/bifrost-http/main.go (1)

324-324: Excellent refactoring to centralize error handling.

The changes successfully consolidate error handling logic into the shared handleBifrostError function, making the codebase more maintainable and consistent. This aligns perfectly with the PR's objective of standardizing error handling.

Also applies to: 345-345

transports/bifrost-http/integrations/utils.go (2)

129-129: Excellent refactoring to standardize error handling.

The consistent use of newBifrostError() throughout the request handling flow successfully centralizes error creation and aligns with the team's preference for maintaining consistent error handling patterns using the standard BifrostError structure.

Also applies to: 140-140, 148-148, 152-152, 156-156, 164-164, 171-171, 177-177, 184-184, 211-211

---

340-359: Well-designed helper function for error standardization.

The newBifrostError helper function correctly wraps standard errors into the BifrostError structure with IsBifrostError: false, which aligns with the team's consistent error handling approach. The function properly handles both nil and non-nil error cases.

[akshaydeo]

Merge activity

• Jun 20, 4:40 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 20, 4:44 PM UTC: Graphite couldn't merge this pull request because a downstack PR feat: added mcp to http transport #100 failed to merge.