glog

Leveled execution logs for Go.

About

This package is forked from https://github.com/golang/glog with the following changes:

• The command line options are not managed automatically (since v1.5.0). Instead, the user can call glog.WithGetOpt() to use with getopt cmd line options (instead of flags) or glog.WithConf() to manually initialize the module.

• All logs are stored in one file instead of one file per level

• Log file name is simplified and no symlinks are created

• Max log file size before rotation is configurable (--logsize)

• If --logdir is not set, the default log output is stderr

• The log filename and line are only displayed when --location is set (performance boost)

• The log line format is [L] yyyy-mm-dd hh:mm:ss.uuuuuu file:line - msg...

• A Logger wrapper was added to allow prefixed logging and per object logger

• All bridging code with default go log pkg was removed

• bugfix: use CallersFrames instead of FuncForPC to get the correct filename

• getopt.Parse() is called automatically if needed before the first output

Installation

Installation can be done as usual:

$ go get github.com/vma/glog

Usage

Initialization:

glog.WithGetopt()
[...]
getopt.Parse()

glog.WithConf(glog.Conf{
    LogDir: "/var/log",
    MaxLogSizeMB: 300,
    Verbosity: 3
})

Basic examples:

glog.Info("Prepare to repel boarders")
glog.Warning("This is a warning")
glog.Fatalf("Initialization failed: %s", err)

See the documentation for the V function for an explanation of these examples:

if glog.V(2) {
    glog.Info("Starting transaction...")
}

glog.V(2).Info("Processed", nItems, "elements")