// SetupLogging will initialize the logger backend and set the flags.
func SetupLogging() {
lfmt := LogFormats[os.Getenv(envLoggingFmt)]
if lfmt == "" {
lfmt = LogFormats[defaultLogFormat]
}
backend := logging.NewLogBackend(os.Stderr, "", 0)
logging.SetBackend(backend)
logging.SetFormatter(logging.MustStringFormatter(lfmt))
lvl := logging.ERROR
if logenv := os.Getenv(envLogging); logenv != "" {
var err error
lvl, err = logging.LogLevel(logenv)
if err != nil {
fmt.Println("error setting log levels", err)
}
}
SetAllLoggers(lvl)
}
// Global writer group for logs to output to
var WriterGroup = NewMirrorWriter()
type Option func()
// Configure applies the provided options sequentially from left to right
func Configure(options ...Option) {
for _, f := range options {
f()
}
}
// LdJSONFormatter Option formats the event log as line-delimited JSON
var LdJSONFormatter = func() {
logging.SetFormatter(&PoliteJSONFormatter{})
}
// TextFormatter Option formats the event log as human-readable plain-text
var TextFormatter = func() {
logging.SetFormatter(logging.DefaultFormatter)
}
func Output(w io.Writer) Option {
return func() {
backend := logging.NewLogBackend(w, "", 0)
logging.SetBackend(backend)
// TODO return previous Output option
}
}