go-logger

This is a fork of the logger from gmkit.

A structured, leveled logger. Output is logfmt by default.

Usage

Minimal configuration

l := logger.New()

l.Info("some message", "anotherkey", "another value")

// Output would resemble:
// ts=2023-04-21T16:09:00.026753Z caller=github.com/jasonhancock/go-logger_test/example_test.go:43 src=go-logger.test level=info msg="some message" anotherkey="another value"

Customized config

l := logger.New(
	logger.WithDestination(os.Stdout),
	logger.WithName("myapp"),
	logger.WithLevel("info"),
	logger.WithFormat(logger.FormatLogFmt),
	logger.With("somekey", "someval"),
)

l.Info("some message", "anotherkey", "another value")

// Output would resemble:
// ts=2023-04-13T17:38:13.516398Z caller=github.com/jasonhancock/go-logger_test/example_test.go:11 somekey=someval src=myapp level=info msg="some message" anotherkey="another value"

JSON

l := logger.New(
	logger.WithFormat(logger.FormatJSON),
	logger.WithName("myapp"),
)

l.Info("some message", "anotherkey", "another value")

// Output would resemble:
// {"anotherkey":"another value","caller":"github.com/jasonhancock/go-logger_test/example_test.go:32","level":"info","msg":"some message","src":"myapp","ts":"2023-04-21T16:08:24.224597Z"}

Using the default logger

l := logger.Default()
l.Info("some message")

// Output would resemble:
// ts=2023-04-21T16:09:28.653472Z caller=github.com/jasonhancock/go-logger_test/example_test.go:51 src=default level=info msg="some message"