transforms/serialize-error.js

// Copyright (c) 2015 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

var isError = require('core-util-is').isError;
var Entry = require('../entry.js');

module.exports = serializableError;

function serializableError(entry) {
    var meta = entry.meta;
    if (isError(meta)) {
        makeSerializable(meta);
    } else if (typeof meta === 'object' && meta !== null) {
        Object.keys(meta).forEach(function (k) {
            if (isError(meta[k])) {
                makeSerializable(meta[k]);
            }
        });
    }

    return new Entry(entry.level, entry.message, entry.meta, entry.path);
}

function makeSerializable(error) {
    if (isConfigurable(error, 'message')) {
        Object.defineProperty(error, 'message', {
            value: error.message,
            enumerable: true,
            configurable: true
        });
    }

    if (isConfigurable(error, 'stack')) {
        Object.defineProperty(error, 'stack', {
            value: error.stack,
            enumerable: true,
            configurable: true
        });
    }
}

function isConfigurable(obj, field) {
    var dp = Object.getOwnPropertyDescriptor(obj, field);
    return dp && dp.configurable;
}