77 lines
2.0 KiB
JavaScript
77 lines
2.0 KiB
JavaScript
#!/usr/bin/env node
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/**
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* <https://github.com/trentm/node-bunyan/issues/130> was a request to have
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* bunyan core support logging some levels to one stream and others to another,
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* *not* limited by bunyan's current support that a stream `level` implies
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* "that level and higher".
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*
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* Let's do that with a custom raw stream.
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*/
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var bunyan = require('../lib/bunyan'),
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safeCycles = bunyan.safeCycles;
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var fs = require('fs');
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/**
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* Use case #1: cli tool that outputs errors on stderr and everything else on
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* stdout.
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*
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* First make a raw bunyan stream (i.e. an object with a `.write(rec)`).
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*/
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function SpecificLevelStream(levels, stream) {
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var self = this;
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this.levels = {};
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levels.forEach(function (lvl) {
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self.levels[bunyan.resolveLevel(lvl)] = true;
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});
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this.stream = stream;
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}
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SpecificLevelStream.prototype.write = function (rec) {
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if (this.levels[rec.level] !== undefined) {
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var str = JSON.stringify(rec, safeCycles()) + '\n';
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this.stream.write(str);
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}
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}
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var log1 = bunyan.createLogger({
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name: 'use-case-1',
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streams: [ {
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level: 'trace',
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type: 'raw',
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stream: new SpecificLevelStream(
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['trace', 'debug', 'info', 'warn'],
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process.stdout)
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}, {
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level: 'error',
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type: 'raw',
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stream: new SpecificLevelStream(
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['error'],
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process.stderr)
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} ]
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});
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log1.info('hi at info level (this should be on stdout)');
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log1.error('alert alert (this should be on stderr)');
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/**
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* Use case #2: nginx-style logger that separates error- and access-logs
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*/
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var log2 = bunyan.createLogger({
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name: 'use-case-2',
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streams: [ {
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level: 'info',
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type: 'raw',
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stream: new SpecificLevelStream(
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['info'],
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fs.createWriteStream('specific-level-streams-http.log',
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{flags: 'a', encoding: 'utf8'}))
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}, {
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level: 'warn',
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path: 'specific-level-streams-http.err.log'
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} ]
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});
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log2.info('200 GET /blah');
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log2.error('500 GET /boom');
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