logmorphic
v0.0.5
Published
isomorphic logger library supports saving log to browser storage
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logmorphic
isomorphic logger. you can also save to localStorage.
API
// `<script src='node_modules/logmorphic/index.js></script>` in browser
// or
// `npm install logmorphic` in node
var Logger = Logger || require('logmorphic').Logger;
var format = '[%date] %category %level (%file) - %message';
var appLogger = Logger.getLogger('APP', {
loglevel: 'DEBUG',
format: format,
storage: {
type: 'localStorage',
key: 'log',
limit: 1000 * 10 // 10K
}
});
var a = { hoge: 100 };
appLogger.trace('the value of "hoge" at', a, 'is', 100);
appLogger.debug('the value of "hoge" at', a, 'is', 100);
appLogger.info('the value of "hoge" at', a, 'is', 100);
appLogger.warn('the value of "hoge" at', a, 'is', 100);
appLogger.error('the value of "hoge" at', a, 'is', 100);
appLogger.fatal('the value of "hoge" at', a, 'is', 100);
output (no TRACE
because of loglevel
settings to DEBUG
)
$ node sample/sample.js
[2015-03-06T07:11:00.036Z] APP DEBUG (sample.js:16) - the value of "hoge" at {"hoge":100} is 100
[2015-03-06T07:11:00.038Z] APP INFO (sample.js:17) - the value of "hoge" at {"hoge":100} is 100
[2015-03-06T07:11:00.039Z] APP WARN (sample.js:18) - the value of "hoge" at {"hoge":100} is 100
[2015-03-06T07:11:00.039Z] APP ERROR (sample.js:19) - the value of "hoge" at {"hoge":100} is 100
[2015-03-06T07:11:00.040Z] APP FATAL (sample.js:20) - the value of "hoge" at {"hoge":100} is 100
- TRACE/DEBUG/INFO log outs to
STDOUT
- WANR/ERROR/FATAL log outs to
STDERROR
or open sample/index.html
in browser
format
format has these place-holder
%date
: current date time withdate.toISOString()
. change format with overrideLogger.prototype._date
.%level
: level of log name in upper case (DEBUG
,INFO
,WARN
,ERROR
,FATAL
).%category
: set bygetLogger()
first arg.%message
: given args to logger. string or serialized number/object/functions.%file
: file name and line number, but has performace consideration.
caution: %file
is build by stack trace from Error object because JS doesn't has API for that.
this is heavy operation, so consider carefully in production environment.
using file
only in develop environment and replace format in production are recomended.
if you wanna get more info in production, use logger.trace()
or out the given Error instance,
which has stack
property.
localStorage
save logs to localStorage on browser by specifying storage
option.
saving are non blocking using setTimeout
.
- type: storage type, default to 'localStorage' and supported that only now.
- key: key of storage column, default to 'logStorage'. keep all log in 1 column of storage for avoid occupy storage, and save order of log.
- limit: limit for save to storage, defalut to 20K. remove as FIFO
install & commands
$ npm install logmorphic
you can call all build task from npm run-scripts. (actually it calls gulp task, please see package.json scripts directive.
$ npm install
$ npm test
$ npm run lint
TypeScript support
use logmorphic.d.ts for typescript.
FAQ
how to save logs to the file ?
logmorphic currentry doesn't support logging to file. because system usually running with process management tools like supervisord, forever, monit etc they usually have logging support which gets log from STDOUT/STDERROR, and saves to file, logserver, fluentd etc, and also log-rotation, log-versioning, log-destroy or so. just use that.
CHANGELOG
- v0.0.5: update dependencies and fix for new .eslintrc
License
MIT: http://jxck.mit-license.org/