@lodestar/beacon-node/lib/util/error.js

A Typescript implementation of the beacon chain

import { REQUEST_ERROR_CLASS_NAME, RESPONSE_ERROR_CLASS_NAME, RequestError, ResponseError } from "@lodestar/reqresp";
import { LodestarError } from "@lodestar/utils";
/**
 * Structured clone does not work with Error objects.
 * For LodestarError, we want to specify the LodestarErrorObject with className so that we can deserialize later.
 */
export function toThreadBoundaryError(error) {
    if (error instanceof LodestarError) {
        return { error: null, object: error.toObject() };
    }
    // note that non-clonable errors will be deserialized as a generic Error object
    return { error, object: null };
}
/**
 * Only RequestError and ResponseError pass through thread boundaries.
 * If we pass more errors in the future through thread boundaries, we need to add them here.
 */
const fromObjectFnRegistry = new Map([
    [RESPONSE_ERROR_CLASS_NAME, ResponseError.fromObject],
    [REQUEST_ERROR_CLASS_NAME, RequestError.fromObject],
]);
/**
 * If error is LodestarError, deserialize it from the LodestarErrorObject.
 * Else use the generic Error object.
 */
export function fromThreadBoundaryError(error) {
    if (error.error) {
        // this is always a generic Error object
        return error.error;
    }
    let clonedError;
    const fromObjectFn = fromObjectFnRegistry.get(error.object.className);
    if (fromObjectFn) {
        clonedError = fromObjectFn(error.object);
    }
    else {
        // should not happen as a LodestarError class should implement "fromObject" method and register it
        // try our best to clone the error with the same stack trace
        clonedError = new LodestarError({ code: "UNKNOWN_ERROR_CLASS" }, `Unknown error class ${error.object.className}`, error.object.stack);
    }
    return clonedError;
}
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