go-ethereum/logger/log.go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package logger

import (
	"fmt"
	"io"
	"log"
	"os"

	"github.com/ethereum/go-ethereum/common"
)

func openLogFile(datadir string, filename string) *os.File {
	path := common.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)
	}

	var sys LogSystem
	sys = NewStdLogSystem(writer, log.LstdFlags, LogLevel(logLevel))
	AddLogSystem(sys)

	return sys
}

func NewJSONsystem(datadir string, logFile string) LogSystem {
	var writer io.Writer
	if logFile == "-" {
		writer = os.Stdout
	} else {
		writer = openLogFile(datadir, logFile)
	}

	var sys LogSystem
	sys = NewJsonLogSystem(writer)
	AddLogSystem(sys)

	return sys
}