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82 lines
2.2 KiB
JavaScript
82 lines
2.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/* General utilities used throughout devtools. */
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/**
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* Turn the error |aError| into a string, without fail.
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*/
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this.safeErrorString = function safeErrorString(aError) {
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try {
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let errorString = aError.toString();
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if (typeof errorString === "string") {
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// Attempt to attach a stack to |errorString|. If it throws an error, or
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// isn't a string, don't use it.
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try {
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if (aError.stack) {
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let stack = aError.stack.toString();
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if (typeof stack === "string") {
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errorString += "\nStack: " + stack;
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}
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}
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} catch (ee) { }
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return errorString;
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}
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} catch (ee) { }
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return "<failed trying to find error description>";
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}
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/**
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* Report that |aWho| threw an exception, |aException|.
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*/
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this.reportException = function reportException(aWho, aException) {
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let msg = aWho + " threw an exception: " + safeErrorString(aException);
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dump(msg + "\n");
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if (Components.utils.reportError) {
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/*
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* Note that the xpcshell test harness registers an observer for
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* console messages, so when we're running tests, this will cause
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* the test to quit.
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*/
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Components.utils.reportError(msg);
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}
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}
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/**
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* Given a handler function that may throw, return an infallible handler
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* function that calls the fallible handler, and logs any exceptions it
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* throws.
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*
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* @param aHandler function
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* A handler function, which may throw.
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* @param aName string
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* A name for aHandler, for use in error messages. If omitted, we use
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* aHandler.name.
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*
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* (SpiderMonkey does generate good names for anonymous functions, but we
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* don't have a way to get at them from JavaScript at the moment.)
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*/
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this.makeInfallible = function makeInfallible(aHandler, aName) {
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if (!aName)
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aName = aHandler.name;
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return function (/* arguments */) {
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try {
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return aHandler.apply(this, arguments);
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} catch (ex) {
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let who = "Handler function";
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if (aName) {
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who += " " + aName;
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}
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reportException(who, ex);
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}
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}
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}
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