func ExampleNewLogger() {
h := log.NewStdFormatter(log.SyncWriter(os.Stdout), "", log.Llevel)
l := log.NewLogger(syslog.LOG_WARNING, h)
l.SetDefaultLevel(syslog.LOG_NOTICE, false)
// Traditional.
// Evaluates arguments unless Lazy is used, but doesn't generate
// Events above log level
l.DEBUG("hej")
l.INFO("hej")
l.NOTICE("hej")
l.WARN("hej")
l.ERROR("hej")
l.CRIT("hej")
l.ALERT("hej")
// Optimal
// Doesn't do anything but checking the log level unless
// something should be logged
// A filtering handler would still be able to discard log events
// based on level. Use Lazy to only evaluate just before formatting
// Even by doing so a filtering writer might still discard the log line
if f, ok := l.DEBUGok(); ok {
f("dav")
}
if f, ok := l.INFOok(); ok {
f("dav")
}
if f, ok := l.NOTICEok(); ok {
f("dav")
}
if f, ok := l.WARNok(); ok {
f("dav")
}
if f, ok := l.ERRORok(); ok {
f("dav")
}
if f, ok := l.CRITok(); ok {
f("dav")
}
if f, ok := l.ALERTok(); ok {
f("dav")
}
// Primitive ... Allows for dynamically choosing log level.
// Otherwise behaves like Traditional
l.Log(syslog.LOG_DEBUG, "hop")
l.Log(syslog.LOG_INFO, "hop")
l.Log(syslog.LOG_NOTICE, "hop")
l.Log(syslog.LOG_WARN, "hop")
l.Log(syslog.LOG_ERROR, "hop")
l.Log(syslog.LOG_CRIT, "hop")
l.Log(syslog.LOG_ALERT, "hop")
// Std logger compatible.
// Will log with the default-level (default "INFO") - if that log-level is enabled.
l.Print("default")
// Fatal and Panic logs with level "ALERT"
l.Fatal("fatal")
}
func ExampleGetLogger() {
l := log.GetLogger("my/lib")
h := log.NewStdFormatter(log.SyncWriter(os.Stdout), "", log.Llevel|log.Lname)
l.SetHandler(h)
l2 := log.GetLogger("my/lib/module")
l3 := l2.With("k", "v")
l3.NOTICE("notice")
// Output:
// <5> (my/lib/module) notice k=v
}
func ExampleSetPrintLevel() {
l := log.GetLogger("my/lib")
h := log.NewStdFormatter(log.SyncWriter(os.Stdout), "", log.Llevel|log.Lname)
l.SetHandler(h)
l.AutoColoring()
l.SetLevel(syslog.LOG_ERROR)
l.SetPrintLevel(syslog.LOG_NOTICE, false)
l.Print("ignoring level")
// Output:
// <5> (my/lib) ignoring level
}
func ExampleWith() {
l := log.GetLogger("my/lib")
h := log.NewStdFormatter(log.SyncWriter(os.Stdout), "", log.Llevel|log.Lname)
l.SetHandler(h)
l.SetLevel(syslog.LOG_ERROR)
l2 := l.With("key", "value")
l3 := l2.With("more", "data")
l3.ERROR("message")
// Output:
// <3> (my/lib) message more=data key=value
}