casper_json_rpc

Trait ErrorCodeT

Source 
pub trait ErrorCodeT:
    Into<(i64, &'static str)>
    + for<'de> Deserialize<'de>
    + Copy
    + Eq
    + Debug { }
Expand description

A marker trait for a type suitable for use as an error code when constructing an Error.

The implementing type must also implement Into<(i64, &'static str)> where the tuple represents the “code” and “message” fields of the Error.

As per the JSON-RPC specification, the code must not fall in the reserved range, i.e. it must not be between -32768 and -32000 inclusive.

Generally the “message” will be a brief const &str, where additional request-specific info can be provided via the additional_info parameter of Error::new.

§Example

use serde::{Deserialize, Serialize};
use casper_json_rpc::ErrorCodeT;

#[derive(Copy, Clone, Eq, PartialEq, Serialize, Deserialize, Debug)]
#[repr(i64)]
pub enum ErrorCode {
    /// The requested item was not found.
    NoSuchItem = -1,
    /// Failed to put the requested item to storage.
    FailedToPutItem = -2,
}

impl From<ErrorCode> for (i64, &'static str) {
    fn from(error_code: ErrorCode) -> Self {
        match error_code {
            ErrorCode::NoSuchItem => (error_code as i64, "No such item"),
            ErrorCode::FailedToPutItem => (error_code as i64, "Failed to put item"),
        }
    }
}

impl ErrorCodeT for ErrorCode {}

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§