actix-error

Introduction

The derive(AsApiError) library provides a powerful, derive macro for Rust developers working with Actix-Web to easily convert enum variants into structured API errors. This library simplifies error handling in web applications by enabling automatic mapping of custom error types to HTTP response errors.

Features

• Automatic Conversion: Automatically convert enum variants to ApiError instances, including status codes, error kinds, and messages.
• Customizable Error Responses: Customize error messages and HTTP status codes directly in enum definitions.
• Support for Structured Errors: Handle errors with additional context, supporting both unnamed and named fields in enum variants.
• Group Error Handling: Aggregate related errors into groups for streamlined error management.
• Integration with Actix-Web: Seamlessly integrates with Actix-Web's error handling mechanisms.

Installation

[dependencies]
actix_error = "0.2.5"

Usage

Defining Errors

Use the #[derive(AsApiError)] macro on enums to define your error types. Customize each variant with #[error] attributes to specify HTTP status codes, error messages, and more.

Handling Errors in Actix-Web

Implement your Actix-Web handlers to return your custom errors. The AsApiErrorTrait ensures they are automatically converted into appropriate HTTP responses.

async fn my_handler() -> Result<HttpResponse, MyError> {
    // Your handler logic here...
    Err(MyError::NotFound)
}

Advanced Error Handling

For errors requiring additional context, use named or unnamed fields directly in your enum variants.

#[derive(AsApiError)]
pub enum DetailedError {
    #[error(code = 500, msg = "Unexpected error occurred: {0}")]
    SystemError(String),
    #[error(status = "BadRequest", msg = "Invalid input: {field}")]
    ValidationError { field: DataField },
}

#[derive(AsApiError)]
pub enum Error {
    #[error(group)]
    Detailed(DetailedError), // Group errors together
    #[error(code = 500, msg = "Database error occurred", ignore)]
    DatabaseError(PostgresError), // Ignore the unnamed field
}

Response format

{
    "kind": "system_error",
    "message": "Unexpected error occurred: Internal Server Error"
    
}