metadata.js•1.33 kB
'use strict';
const format = require('./format');
function fillExcept(info, fillExceptKeys, metadataKey) {
const savedKeys = fillExceptKeys.reduce((acc, key) => {
acc[key] = info[key];
delete info[key];
return acc;
}, {});
const metadata = Object.keys(info).reduce((acc, key) => {
acc[key] = info[key];
delete info[key];
return acc;
}, {});
Object.assign(info, savedKeys, {
[metadataKey]: metadata
});
return info;
}
function fillWith(info, fillWithKeys, metadataKey) {
info[metadataKey] = fillWithKeys.reduce((acc, key) => {
acc[key] = info[key];
delete info[key];
return acc;
}, {});
return info;
}
/**
* Adds in a "metadata" object to collect extraneous data, similar to the metadata
* object in winston 2.x.
*/
module.exports = format((info, opts = {}) => {
let metadataKey = 'metadata';
if (opts.key) {
metadataKey = opts.key;
}
let fillExceptKeys = [];
if (!opts.fillExcept && !opts.fillWith) {
fillExceptKeys.push('level');
fillExceptKeys.push('message');
}
if (opts.fillExcept) {
fillExceptKeys = opts.fillExcept;
}
if (fillExceptKeys.length > 0) {
return fillExcept(info, fillExceptKeys, metadataKey);
}
if (opts.fillWith) {
return fillWith(info, opts.fillWith, metadataKey);
}
return info;
});