Cleaned up some of that util

logger/log.go

@@ -0,0 +1,33 @@
+package logger
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+
+	"github.com/ethereum/go-ethereum/ethutil"
+)
+
+func openLogFile(datadir string, filename string) *os.File {
+	path := ethutil.AbsolutePath(datadir, filename)
+	file, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+	if err != nil {
+		panic(fmt.Sprintf("error opening log file '%s': %v", filename, err))
+	}
+	return file
+}
+
+func New(datadir string, logFile string, logLevel int) LogSystem {
+	var writer io.Writer
+	if logFile == "" {
+		writer = os.Stdout
+	} else {
+		writer = openLogFile(datadir, logFile)
+	}
+
+	sys := NewStdLogSystem(writer, log.LstdFlags, LogLevel(logLevel))
+	AddLogSystem(sys)
+
+	return sys
+}