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logger.go
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logger.go
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package main
import (
"fmt"
"os"
"time"
"github.com/sirupsen/logrus"
)
var (
log *logrus.Logger
)
func setupLogger() {
log = logrus.New()
// Handle logfile
if *logFile == "" {
log.SetOutput(os.Stderr)
} else {
writer, err := os.OpenFile(*logFile, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0600)
if err != nil {
fmt.Printf("cannot open log file: %s\n", err)
os.Exit(1)
}
log.SetOutput(writer)
}
// Handle log_format
switch *logFormat {
case "json":
log.SetFormatter(&logrus.JSONFormatter{
TimestampFormat: time.RFC3339Nano,
DisableHTMLEscape: true,
})
case "plain":
log.SetFormatter(&logrus.TextFormatter{
DisableTimestamp: true,
})
case "", "default":
log.SetFormatter(&logrus.TextFormatter{
FullTimestamp: true,
})
default:
fmt.Fprintf(os.Stderr, "Invalid log_format: %s\n", *logFormat)
os.Exit(1)
}
// Handle log_level
level, err := logrus.ParseLevel(*logLevel)
if err != nil {
level = logrus.InfoLevel
log.WithField("given_level", *logLevel).
Warn("could not parse log level, defaulting to 'info'")
}
log.SetLevel(level)
}