Logger

Logger

Manages all log messages from SDK modules, you can use this logger to add your custom messages and set your custom log handlers to forward all messages to your own monitoring system.

By default all loggers are set in level OFF (Logger.OFF), and there are available the following log levels.

This module is based on js-logger you can refer to its documentation or following our examples.

Properties
Name Type Description
TRACE LogLevel

Logger.TRACE
DEBUG LogLevel

Logger.DEBUG
INFO LogLevel

Logger.INFO
TIME LogLevel

Logger.TIME
WARN LogLevel

Logger.WARN
ERROR LogLevel

Logger.ERROR
OFF LogLevel

Logger.OFF
Source:

Examples

// Log a message
Logger.info('This is an info log', 445566)
// [Global] 2021-04-05T15:58:44.893Z - This is an info log 445566
// Create a named logger
const myLogger = Logger.get('CustomLogger')
myLogger.setLevel(Logger.WARN)
myLogger.warn('This is a warning log')
// [CustomLogger] 2021-04-05T15:59:53.377Z - This is a warning log
// Profiling
// Start timing something
Logger.time('Timer name')

// ... some time passes ...

// Stop timing something.
Logger.timeEnd('Timer name')
// Timer name: 35282.997802734375 ms

Methods

# (static) get(name) → {Object}

Gets or creates a named logger. Named loggers are used to group log messages that refers to a common context.

Parameters:
Name Type Description
name String
Source:
Returns:

Logger object with same properties and functions as Logger except history and handlers related functions.

Type
Object
Example 
const myLogger = Logger.get('MyLogger')
// Set logger level
myLogger.setLevel(Logger.DEBUG)

myLogger.debug('This is a debug log')
myLogger.info('This is a info log')
myLogger.warn('This is a warning log')

// Get logger level
myLogger.getLevel()
// {value: 3, name: 'INFO'}

# (static) getHistory() → {Array.<String>}

Get all logs generated during a session. All logs are recollected besides the log level selected by the user.

Source:
Returns:

All logs recollected from level TRACE.

Type
Array.<String>
Example 
Logger.getHistory()
// Outupt
// [
//   "[Director] 2021-04-05T14:09:26.625Z - Getting publisher connection data for stream name:  1xxx2",
//   "[Director] 2021-04-05T14:09:27.064Z - Getting publisher response",
//   "[Publish]  2021-04-05T14:09:27.066Z - Broadcasting"
// ]

# (static) getHistoryMaxSize()

Get the maximum count of logs preserved during a session.

Source:
Example 
Logger.getHistoryMaxSize()

# (static) getLevel() → {LogLevel}

Get global current logger level. Also you can get the level of any particular logger.

Source:
Returns:
Type
LogLevel
Example 
// Global Level
Logger.getLevel()
// Output
// {value: 2, name: 'DEBUG'}

// Module Level
Logger.get('Publish').getLevel()
// Output
// {value: 5, name: 'WARN'}

# (static) setHandler(handler, level)

Add your custom log handler to Logger at the specified level.

Parameters:
Name Type Description
handler loggerHandler

Your custom log handler function.
level LogLevel

Log level to filter messages.
Source:
Example 
const myHandler = (messages, context) => {
 // You can filter by logger
 if (context.name === 'Publish') {
   sendToMyLogger(messages[0])
 }

 // You can filter by logger level
 if (context.level.value >= Logger.INFO.value) {
   sendToMyLogger(messages[0])
 }
}

Logger.setHandler(myHandler, Logger.INFO)

# (static) setHistoryMaxSize(maxSize)

Set the maximum count of logs to preserve during a session. By default it is set to 10000.

Parameters:
Name Type Description
maxSize Number

Max size of log history. Set 0 to disable history or -1 to unlimited log history.
Source:
Example 
Logger.setHistoryMaxSize(100)

# (static) setLevel(level)

Set log level to all loggers.

Parameters:
Name Type Description
level LogLevel

New log level to be set.
Source:
Example 
// Global Level
Logger.setLevel(Logger.DEBUG)

// Module Level
Logger.get('Publish').setLevel(Logger.DEBUG)