Simple scheduling for short-running Docker containers https://blog.iamthefij.com/2018/11/19/introducing-dockron-scheduling/
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// Package slog is a super simple logger that allows a few convenience methods
// for handling debug vs warning/error logs. It also adds a few conveniences for
// handling errors.
package slog
import (
"log"
"os"
)
var (
// DebugLevel indicates if we should log at the debug level
DebugLevel = true
// Default set of flags to use
defaultFlags = log.LstdFlags | log.Lmsgprefix
// Loggers for various levels. Prefixes are padded to align logged content
loggerInfo = log.New(os.Stderr, "INFO ", defaultFlags)
loggerWarning = log.New(os.Stderr, "WARNING ", defaultFlags)
loggerError = log.New(os.Stderr, "ERROR ", defaultFlags)
loggerDebug = log.New(os.Stderr, "DEBUG ", defaultFlags)
// Convenience for calling functions for all loggers in one method
allLoggers = []*log.Logger{
loggerInfo,
loggerWarning,
loggerError,
loggerDebug,
}
)
// SetFlags allows changing the logger flags using flags found in `log`
func SetFlags(flag int) {
for _, logger := range allLoggers {
logger.SetFlags(flag)
}
}
// Log formats logs directly to the main logger
func Log(format string, v ...interface{}) {
log.Printf(format, v...)
}
// Info formats logs with an INFO prefix
func Info(format string, v ...interface{}) {
loggerInfo.Printf(format, v...)
}
// Warning will log with a WARNING prefix
func Warning(format string, v ...interface{}) {
loggerWarning.Printf(format, v...)
}
// Error will log with a ERROR prefix
func Error(format string, v ...interface{}) {
loggerError.Printf(format, v...)
}
// Debug will log with a DEBUG prefix if DebugLevel is set
func Debug(format string, v ...interface{}) {
if !DebugLevel {
return
}
loggerDebug.Printf(format, v...)
}
// WarnOnErr if error provided, will provide a warning if an error is provided
func WarnOnErr(err error, format string, v ...interface{}) {
if err != nil {
loggerWarning.Printf(format, v...)
loggerError.Print(err)
}
}
// FatalOnErr if error provided, will log out details of an error and exit
func FatalOnErr(err error, format string, v ...interface{}) {
if err != nil {
loggerError.Printf(format, v...)
loggerError.Fatal(err)
}
}
// PanicOnErr if error provided, will log out details of an error and exit
func PanicOnErr(err error, format string, v ...interface{}) {
if err != nil {
loggerError.Printf(format, v...)
loggerError.Panic(err)
}
}