go-logging

go-logging is a simple logging package for go that ressembles the python logging module

• Easy and intuitive to use
• Log to multiple handlers with different logging levels and different outputs
• Write your own formatters(based on "text/template") and use common functions
• Call logging functions variadically to format the log message with arguments

Logger functions and

The following functions are currently available for calling from the formatter:

1. asctime - the log record creation time in "YYYY-MM-DD HH:mm:SS" format
2. created - the log record creation time in epoch
3. filename - the name of the file calling the function
4. lineno - the line number of the file calling the function
5. fileline - the filename and lineno in this format: "filename: lineno"(**this usage is preferred when choosing to present both filename and line number)

Examples:

package main

import (
	"os"

	"github.com/omrikiei/go-logging"
)

func main() {
	// Handler with default formatter
	handler, err := logging.NewHandler(logging.DEBUG, os.Stdout)
	if err != nil {
		panic("got an error")
	}
	logging.AddHandler(handler)
	logging.Debug("Testing a debug message")
	logging.Info("Testing an info message")
	logging.Warn("Testing a warning meesage")
	logging.Error("Testing an error message")
	// Setting a different formatter
	handler.SetFormatter("{{ created }}; {{ fileline }}; {{.LevelNum}}; {{.Message}}")
	logging.Debug("Testing a debug message")
	logging.Info("Testing an info message")
	logging.Warn("Testing a warning meesage")
	logging.Error("Testing an error message")
	// Return to the previous formatter
	handler.SetFormatter(logging.DefaultFormatterPattern)
	str := "hello"
	logging.Debug("Testing a debug message with arguments %s:%d", str, 0)
	logging.Info("Testing an info message with arguments %s:%d", str, 1)
	logging.Warn("Testing a warning meesage with arguments %s:%d", str, 2)
	logging.Error("Testing an error message with arguments %s:%d", str, 3)
}

Output:

eomri-mac:tests eomri$ go run main.go
2018-08-25 01:44:25; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 17; DEBUG; Testing a debug message
2018-08-25 01:44:25; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 18; INFO; Testing an info message
2018-08-25 01:44:25; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 19; WARNING; Testing a warning meesage
2018-08-25 01:44:25; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 20; ERROR; Testing an error message
1535150665; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 23; 0; Testing a debug message
1535150665; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 24; 1; Testing an info message
1535150665; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 25; 2; Testing a warning meesage
1535150665; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 26; 3; Testing an error message
2018-08-25 01:44:25; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 30; DEBUG; Testing a debug message with arguments hello:0
eomri-mac:tests eomri$ go run main.go
2018-08-25 01:52:37; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 17; DEBUG; Testing a debug message
2018-08-25 01:52:37; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 18; INFO; Testing an info message
2018-08-25 01:52:37; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 19; WARNING; Testing a warning meesage
2018-08-25 01:52:37; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 20; ERROR; Testing an error message
1535151157; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 23; 0; Testing a debug message
1535151157; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 24; 1; Testing an info message
1535151157; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 25; 2; Testing a warning meesage
1535151157; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 26; 3; Testing an error message
2018-08-25 01:52:37; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 30; DEBUG; Testing a debug message with arguments hello:0
2018-08-25 01:52:37; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 31; INFO; Testing an info message with arguments hello:1
2018-08-25 01:52:37; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 32; WARNING; Testing a warning meesage with arguments hello:2
2018-08-25 01:52:37; /Users/eomri/go/src/github.com/omrikiei/go-logging/tests/main.go: 33; ERROR; Testing an error message with arguments hello:3
eomri-mac:tests eomri$