ce4c83ff
 wxy
初始提交
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'use strict';
var Promise = require('./core');
var DEFAULT_WHITELIST = [
ReferenceError,
TypeError,
RangeError
];
var enabled = false;
exports.disable = disable;
function disable() {
enabled = false;
Promise._onHandle = null;
Promise._onReject = null;
}
exports.enable = enable;
function enable(options) {
options = options || {};
if (enabled) disable();
enabled = true;
var id = 0;
var displayId = 0;
var rejections = {};
Promise._onHandle = function (promise) {
if (
promise._state === 2 && // IS REJECTED
rejections[promise._rejectionId]
) {
if (rejections[promise._rejectionId].logged) {
onHandled(promise._rejectionId);
} else {
clearTimeout(rejections[promise._rejectionId].timeout);
}
delete rejections[promise._rejectionId];
}
};
Promise._onReject = function (promise, err) {
if (promise._deferredState === 0) { // not yet handled
promise._rejectionId = id++;
rejections[promise._rejectionId] = {
displayId: null,
error: err,
timeout: setTimeout(
onUnhandled.bind(null, promise._rejectionId),
// For reference errors and type errors, this almost always
// means the programmer made a mistake, so log them after just
// 100ms
// otherwise, wait 2 seconds to see if they get handled
matchWhitelist(err, DEFAULT_WHITELIST)
? 100
: 2000
),
logged: false
};
}
};
function onUnhandled(id) {
if (
options.allRejections ||
matchWhitelist(
rejections[id].error,
options.whitelist || DEFAULT_WHITELIST
)
) {
rejections[id].displayId = displayId++;
if (options.onUnhandled) {
rejections[id].logged = true;
options.onUnhandled(
rejections[id].displayId,
rejections[id].error
);
} else {
rejections[id].logged = true;
logError(
rejections[id].displayId,
rejections[id].error
);
}
}
}
function onHandled(id) {
if (rejections[id].logged) {
if (options.onHandled) {
options.onHandled(rejections[id].displayId, rejections[id].error);
} else if (!rejections[id].onUnhandled) {
console.warn(
'Promise Rejection Handled (id: ' + rejections[id].displayId + '):'
);
console.warn(
' This means you can ignore any previous messages of the form "Possible Unhandled Promise Rejection" with id ' +
rejections[id].displayId + '.'
);
}
}
}
}
function logError(id, error) {
console.warn('Possible Unhandled Promise Rejection (id: ' + id + '):');
var errStr = (error && (error.stack || error)) + '';
errStr.split('\n').forEach(function (line) {
console.warn(' ' + line);
});
}
function matchWhitelist(error, list) {
return list.some(function (cls) {
return error instanceof cls;
});
}
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