61 lines
2 KiB
JavaScript
61 lines
2 KiB
JavaScript
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#!/usr/bin/env node
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/* BEGIN JSSTYLED */
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/**
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* <https://github.com/trentm/node-bunyan/pull/473> is a change to add a
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* feature to Bunyan's log record stringification to log `undefined` values.
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* Let's attempt that with a custom raw stream.
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*
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* Note that a raw stream here isn't ideal, because using a custom raw stream
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* means that it is a pain to use some of the other built-in stream types
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* (file, rotating-file). However, it might be a satisfactory workaround for
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* some.
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*
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* Example:
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* $ node log-undefined-values.js
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* {"name":"log-undefined-values","hostname":"danger0.local","pid":28161,"level":30,"anull":null,"aundef":"[Undefined]","anum":42,"astr":"foo","msg":"hi","time":"2017-03-04T20:53:54.331Z","v":0}
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* $ node log-undefined-values.js | bunyan
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* [2017-03-04T20:54:41.874Z] INFO: log-undefined-values/28194 on danger0.local: hi (anull=null, aundef=[Undefined], anum=42, astr=foo)
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*/
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/* END JSSTYLED */
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var bunyan = require('../lib/bunyan');
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var fs = require('fs');
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function replacer() {
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// Note: If node > 0.10, then could use Set here (see `safeCyclesSet()`
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// in bunyan.js) for a performance improvement.
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var seen = [];
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return function (key, val) {
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if (val === undefined) {
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return '[Undefined]';
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} else if (!val || typeof (val) !== 'object') {
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return val;
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}
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if (seen.indexOf(val) !== -1) {
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return '[Circular]';
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}
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seen.push(val);
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return val;
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};
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}
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function LogUndefinedValuesStream(stream) {
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this.stream = stream;
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}
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LogUndefinedValuesStream.prototype.write = function (rec) {
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var str = JSON.stringify(rec, replacer()) + '\n';
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this.stream.write(str);
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}
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var log = bunyan.createLogger({
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name: 'log-undefined-values',
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streams: [ {
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level: 'info',
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type: 'raw',
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stream: new LogUndefinedValuesStream(process.stdout)
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} ]
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});
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log.info({anull: null, aundef: undefined, anum: 42, astr: 'foo'}, 'hi');
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