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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/. */
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
Log: "chrome://remote/content/shared/Log.sys.mjs",
});
ChromeUtils.defineLazyGetter(lazy, "logger", () =>
lazy.Log.get(lazy.Log.TYPES.CDP)
);
export class RemoteAgentError extends Error {
constructor(message = "", cause = undefined) {
cause = cause || message;
super(cause);
this.name = this.constructor.name;
this.message = message;
this.cause = cause;
this.notify();
}
notify() {
console.error(this);
lazy.logger.error(this.toString({ stack: true }));
}
toString({ stack = false } = {}) {
return RemoteAgentError.format(this, { stack });
}
static format(e, { stack = false } = {}) {
return formatError(e, { stack });
}
/**
* Takes a serialised CDP error and reconstructs it
* as a RemoteAgentError.
*
* The error must be of this form:
*
* {"message": "TypeError: foo is not a function\n
* execute@chrome://remote/content/cdp/sessions/Session.sys.mjs:73:39\n
* onMessage@chrome://remote/content/cdp/sessions/TabSession.sys.mjs:65:20"}
*
* This approach has the notable deficiency that it cannot deal
* with causes to errors because of the unstructured nature of CDP
* errors. A possible future improvement would be to extend the
* error serialisation to include discrete fields for each data
* property.
*
* @param {object} json
* CDP error encoded as a JSON object, which must have a
* "message" field, where the first line will make out the error
* message and the subsequent lines the stacktrace.
*
* @returns {RemoteAgentError}
*/
static fromJSON(json) {
const [message, ...stack] = json.message.split("\n");
const err = new RemoteAgentError();
err.message = message.slice(0, -1);
err.stack = stack.map(s => s.trim()).join("\n");
err.cause = null;
return err;
}
}
/**
* A fatal error that it is not possible to recover from
* or send back to the client.
*
* Constructing this error will force the application to quit.
*/
export class FatalError extends RemoteAgentError {
constructor(...args) {
super(...args);
this.quit();
}
notify() {
lazy.logger.fatal(this.toString({ stack: true }));
}
quit(mode = Ci.nsIAppStartup.eForceQuit) {
Services.startup.quit(mode);
}
}
/** When an operation is not yet implemented. */
export class UnsupportedError extends RemoteAgentError {}
/** The requested remote method does not exist. */
export class UnknownMethodError extends RemoteAgentError {
constructor(domain, command = null) {
if (command) {
super(`${domain}.${command}`);
} else {
super(domain);
}
}
}
function formatError(error, { stack = false } = {}) {
const els = [];
els.push(error.name);
if (error.message) {
els.push(": ");
els.push(error.message);
}
if (stack && error.stack) {
els.push(":\n");
const stack = error.stack.trim().split("\n");
els.push(stack.map(line => `\t${line}`).join("\n"));
if (error.cause) {
els.push("\n");
els.push("caused by: " + formatError(error.cause, { stack }));
}
}
return els.join("");
}
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