Derive Macro GrpcError 

#[derive(GrpcError)]
{
    // Attributes available to this derive:
    #[grpc]
    #[grpc_error]
    #[tracing]
}

Derive macro for gRPC error enums.

Generates:

• From<Self> for tonic::Status

Enum-level defaults can be declared with #[grpc_error(...)] and overridden per variant with #[grpc(...)].

Supported attributes:

• code = "invalid_argument"
• message = "custom text"
• message = field_name
• transparent (variant-only)
• tracing = <level> inside #[grpc_error(...)] or #[grpc(...)]
• #[tracing(level)]: backward-compatible shorthand at variant level

gRPC code values accepted by #[grpc(code = "...")]:

• ok
• cancelled
• unknown
• invalid_argument
• deadline_exceeded
• not_found
• already_exists
• permission_denied
• resource_exhausted
• failed_precondition
• aborted
• out_of_range
• unimplemented
• internal
• unavailable
• data_loss
• unauthenticated

Example

use sword::prelude::*;
use thiserror::Error;

#[derive(Debug, Error, GrpcError)]
#[grpc_error(code = "internal", tracing = error)]
enum UserError {
    #[grpc(code = "not_found", tracing = info)]
    #[error("User not found: {id}")]
    NotFound { id: String },

    #[grpc(code = "invalid_argument", message = client_message)]
    #[error("Validation error: {internal}")]
    Validation {
        client_message: String,
        internal: String,
    },

    #[grpc(transparent)]
    #[error("Database error: {0}")]
    Database(#[from] anyhow::Error),
}