113 lines
2.9 KiB
JavaScript
113 lines
2.9 KiB
JavaScript
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'use strict';
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var Promise = require('./core');
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var DEFAULT_WHITELIST = [
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ReferenceError,
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TypeError,
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RangeError
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];
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var enabled = false;
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exports.disable = disable;
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function disable() {
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enabled = false;
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Promise._onHandle = null;
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Promise._onReject = null;
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}
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exports.enable = enable;
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function enable(options) {
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options = options || {};
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if (enabled) disable();
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enabled = true;
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var id = 0;
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var displayId = 0;
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var rejections = {};
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Promise._onHandle = function (promise) {
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if (
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promise._state === 2 && // IS REJECTED
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rejections[promise._rejectionId]
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) {
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if (rejections[promise._rejectionId].logged) {
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onHandled(promise._rejectionId);
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} else {
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clearTimeout(rejections[promise._rejectionId].timeout);
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}
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delete rejections[promise._rejectionId];
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}
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};
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Promise._onReject = function (promise, err) {
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if (promise._deferredState === 0) { // not yet handled
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promise._rejectionId = id++;
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rejections[promise._rejectionId] = {
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displayId: null,
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error: err,
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timeout: setTimeout(
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onUnhandled.bind(null, promise._rejectionId),
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// For reference errors and type errors, this almost always
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// means the programmer made a mistake, so log them after just
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// 100ms
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// otherwise, wait 2 seconds to see if they get handled
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matchWhitelist(err, DEFAULT_WHITELIST)
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? 100
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: 2000
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),
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logged: false
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};
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}
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};
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function onUnhandled(id) {
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if (
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options.allRejections ||
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matchWhitelist(
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rejections[id].error,
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options.whitelist || DEFAULT_WHITELIST
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)
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) {
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rejections[id].displayId = displayId++;
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if (options.onUnhandled) {
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rejections[id].logged = true;
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options.onUnhandled(
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rejections[id].displayId,
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rejections[id].error
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);
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} else {
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rejections[id].logged = true;
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logError(
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rejections[id].displayId,
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rejections[id].error
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);
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}
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}
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}
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function onHandled(id) {
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if (rejections[id].logged) {
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if (options.onHandled) {
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options.onHandled(rejections[id].displayId, rejections[id].error);
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} else if (!rejections[id].onUnhandled) {
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console.warn(
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'Promise Rejection Handled (id: ' + rejections[id].displayId + '):'
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);
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console.warn(
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' This means you can ignore any previous messages of the form "Possible Unhandled Promise Rejection" with id ' +
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rejections[id].displayId + '.'
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);
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}
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}
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}
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}
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function logError(id, error) {
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console.warn('Possible Unhandled Promise Rejection (id: ' + id + '):');
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var errStr = (error && (error.stack || error)) + '';
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errStr.split('\n').forEach(function (line) {
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console.warn(' ' + line);
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});
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}
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function matchWhitelist(error, list) {
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return list.some(function (cls) {
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return error instanceof cls;
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});
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}
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