log

This a logger supporting the following outputs:

stderr
network (TCP, UDP, Unix networks)
file (zlib compression)
custom output

Installation

go get github.com/avegner/log

API

Logger has a very simple interface:

type Logger interface {
	Printf(level Level, format string, args ...interface{}) error
	SetMask(mask Level)
	Flush() error
	Child(name string) Logger
}

Printf - prints a log message with the given level
SetMask - sets enabled log levels
Flush - flushes all log outputs
Child - creates a child logger with the same parameters (mask, outputs, flags)

Each output supports the following interface:

type Outputter interface {
	io.Writer
	io.Closer
	Flush() error
}

There are standard outputs:

func NewNetOut(network, address string) (Outputter, error)

func NewFileOut(name string, perm os.FileMode, append bool, comprLevel int) (Outputter, error)

func NewStderrOut() (Outputter, error)

Any custom output implementing Outputter interface may be created.

To create a logger and a child logger:

// main scope
o, err := out.NewStderrOut()
if err != nil {
    // ...
}
mlog := log.New("main", log.ALL_LEVELS, log.STD_FLAGS, []out.Outputter{o})

// module scope
chlog := mlog.Child("module")