strlog ·

Structured, hierarchical, leveled logging for Dart.

Features:

• Built-in primitives for bound structured record context
• Leveled records
• Built-in configurable text and JSON log formatters
• Built-in support for filtering records
• Dozens of log record handlers out of the box

The strlog package exposes three types of loggers: hierarchical, detached, and noop loggers.

A hierarchical logger is a tree-like logging structure allowing child loggers to forward records to higher-level loggers, all the way up to the highest-level logger, i.e., the root logger. The hierarchy of loggers is defined based on the logger name. The name represents a dot-separated string, where each part defines a hierarchy level.

In contrast, a detached logger is a hierarchy-free logger, meaning that it does not have a parent or children.

Lastly, a noop logger discards any records it receives.

Usage

Use dart pub to get the package:

$ dart pub add strlog

Once the package is installed, it's ready to be used.

Getting started

The easiest way to start logging records is to use the global logger provided in the global_logger package library. The global logger comes preconfigured to print logs to the console using print.

import 'package:strlog/global_logger.dart' as logger;
import 'package:strlog/strlog.dart' as log;

void main() async {
  logger.info('Greeting', const [log.Str('hello', 'world')]);
}

// => '2019-06-27 15:37:38.046859 [INFO]: Greeting hello=world'

To override the default logger, you can use the set function exposed by the global_logger package:

import 'package:strlog/formatters.dart';
import 'package:strlog/global_logger.dart' as logger;
import 'package:strlog/handlers.dart';
import 'package:strlog/strlog.dart' as log;

final handler = ConsoleHandler(formatter: JsonFormatter.withDefaults());
final _logger = log.Logger.getLogger('strlog.example')..handler = handler;

void main() async {
  // Set the newly created logger as the global one.
  logger.set(_logger);

  logger.info('Greeting', const [log.Str('hello', 'world')]);

  await handler.close();
}

For more detailed information, check out the documentation at strlog.inout.gg.

License

Released under the MIT license.