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kutuluk/loglevel-plugin-prefix: Plugin for loglevel message prefixing

Plugin for loglevel message prefixing.

npm install loglevel-plugin-prefix

This plugin is under active development and should be considered as an unstable. No guarantees regarding API stability are made. Backward compatibility is guaranteed only by path releases.

This method registers plugin for loglevel. This method must be called at least once before any call to the apply method. Repeated calls to this method are ignored.

loglevel - the root logger, imported from loglevel module

This method applies the plugin to the logger. Before using this method, the reg method must be called, otherwise a warning will be logged. From the next release, the call apply before reg will throw an error.

logger - any logger of loglevel

options - an optional configuration object

var defaults = {
  template: '[%t] %l:',
  levelFormatter: function (level) {
    return level.toUpperCase();
  },
  nameFormatter: function (name) {
    return name || 'root';
  },
  timestampFormatter: function (date) {
    return date.toTimeString().replace(/.*(\d{2}:\d{2}:\d{2}).*/, '$1');
  },
  format: undefined
};

Plugin formats the prefix using template option as a printf-like format. The template is a string containing zero or more placeholder tokens. Each placeholder token is replaced with the value from loglevel messages parameters. Supported placeholders are:

• %l - level of message
• %n - name of logger
• %t - timestamp of message

The levelFormatter, nameFormatter and timestampFormatter is a functions for formatting corresponding values.

Alternatively, you can use format option. This is a function that receives formatted values (level, name, timestamp) and should returns a prefix string.

If both format and template are present in the configuration, the template parameter is ignored. When both these parameters are missing in the configuration, the inherited behavior is used.

<script src="https://unpkg.com/loglevel/dist/loglevel.min.js"></script>
<script src="https://unpkg.com/loglevel-plugin-prefix@^0.8/dist/loglevel-plugin-prefix.min.js"></script>

<script>
  var logger = log.noConflict();
  var prefixer = prefix.noConflict();
  prefixer.reg(logger);
  prefixer.apply(logger);
  logger.warn('prefixed message');
</script>

Output

[16:53:46] WARN: prefixed message

const chalk = require('chalk');
const log = require('loglevel');
const prefix = require('loglevel-plugin-prefix');

const colors = {
  TRACE: chalk.magenta,
  DEBUG: chalk.cyan,
  INFO: chalk.blue,
  WARN: chalk.yellow,
  ERROR: chalk.red,
};

prefix.reg(log);
log.enableAll();

prefix.apply(log, {
  format(level, name, timestamp) {
    return `${chalk.gray(`[${timestamp}]`)} ${colors[level.toUpperCase()](level)} ${chalk.green(`${name}:`)}`;
  },
});

prefix.apply(log.getLogger('critical'), {
  format(level, name, timestamp) {
    return chalk.red.bold(`[${timestamp}] ${level} ${name}:`);
  },
});

log.trace('trace');
log.debug('debug');
log.getLogger('critical').info('Something significant happened');
log.log('log');
log.info('info');
log.warn('warn');
log.error('error');

Output

const log = require('loglevel');
const prefix = require('loglevel-plugin-prefix');

prefix.reg(log);
log.enableAll();

prefix.apply(log, {
  template: '[%t] %l (%n) static text:',
  levelFormatter(level) {
    return level.toUpperCase();
  },
  nameFormatter(name) {
    return name || 'global';
  },
  timestampFormatter(date) {
    return date.toISOString();
  },
});

log.info('%s prefix', 'template');

const fn = (level, name, timestamp) => `[${timestamp}] ${level} (${name}) static text:`;

prefix.apply(log, { format: fn });

log.info('%s prefix', 'functional');

prefix.apply(log, { template: '[%t] %l (%n) static text:' });

log.info('again %s prefix', 'template');

Output

[2017-05-29T12:53:46.000Z] INFO (global) static text: template prefix
[2017-05-29T12:53:46.000Z] INFO (global) static text: functional prefix
[2017-05-29T12:53:46.000Z] INFO (global) static text: again template prefix

const log = require('loglevel');
const prefix = require('loglevel-plugin-prefix');

prefix.reg(log);
log.enableAll();

log.info('root');

const chicken = log.getLogger('chicken');
chicken.info('chicken');

prefix.apply(chicken, { template: '%l (%n):' });
chicken.info('chicken');

prefix.apply(log);
log.info('root');

const egg = log.getLogger('egg');
egg.info('egg');

const fn = (level, name) => `${level} (${name}):`;

prefix.apply(egg, { format: fn });
egg.info('egg');

prefix.apply(egg, {
  levelFormatter(level) {
    return level.toLowerCase();
  },
});
egg.info('egg');

chicken.info('chicken');
log.info('root');

Output

root
chicken
INFO (chicken): chicken
[16:53:46] INFO: root
[16:53:46] INFO: egg
INFO (egg): egg
info (egg): egg
INFO (chicken): chicken
[16:53:46] INFO: root

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