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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const EXPORTED_SYMBOLS = ["error"];
class MessageHandlerError extends Error {
/**
* @param {(string|Error)=} x
* Optional string describing error situation or Error instance
* to propagate.
*/
constructor(x) {
super(x);
this.name = this.constructor.name;
this.status = "message handler error";
// Error's ctor does not preserve x' stack
if (typeof x?.stack !== "undefined") {
this.stack = x.stack;
}
}
/**
* @return {Object.<string, string>}
* JSON serialisation of error prototype.
*/
toJSON() {
return {
error: this.status,
message: this.message || "",
stacktrace: this.stack || "",
};
}
/**
* Unmarshals a JSON error representation to the appropriate MessageHandler
* error type.
*
* @param {Object.<string, string>} json
* Error object.
*
* @return {Error}
* Error prototype.
*/
static fromJSON(json) {
if (typeof json.error == "undefined") {
let s = JSON.stringify(json);
throw new TypeError("Undeserialisable error type: " + s);
}
if (!STATUSES.has(json.error)) {
throw new TypeError("Not of MessageHandlerError descent: " + json.error);
}
let cls = STATUSES.get(json.error);
let err = new cls();
if ("message" in json) {
err.message = json.message;
}
if ("stacktrace" in json) {
err.stack = json.stacktrace;
}
return err;
}
}
/**
* A command could not be handled by the message handler network.
*/
class UnsupportedCommandError extends MessageHandlerError {
constructor(message) {
super(message);
this.status = "unsupported message handler command";
}
}
const STATUSES = new Map([
["message handler error", MessageHandlerError],
["unsupported message handler command", UnsupportedCommandError],
]);
/** @namespace */
this.error = {
MessageHandlerError,
UnsupportedCommandError,
};