config.go

// Copyright 2018. box.la authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config

import (
	"path/filepath"
	"os"
	"path"
	"os/user"
	"runtime"
	"os/exec"
	"github.com/BurntSushi/toml"
	logger "github.com/alecthomas/log4go"
)

var cfg Config

var (
	rootPath string
	filePath string
)


func init() {
	main, _ := exec.LookPath(os.Args[0])
	file, _ := filepath.Abs(main)
	rootPath = path.Dir(file)
}


func GetConfig() Config{
	return cfg
}


func LoadConfig(configPath, defaultFileName string) (*Config, error) {
	configPath = GetConfigFilePath(configPath, defaultFileName)
	_, err := toml.DecodeFile(configPath, &cfg)

	if err != nil {
		return nil, err
	}
	return &cfg, nil
}

// configPath 不为空时，不检查fileName
func GetConfigFilePath(configPath, defaultFileName string) string {
	for i := 0; i < 3; i++ {
		if configPath != "" {
			if _, err := os.Stat(configPath); !os.IsNotExist(err) {
				break
			}
		}
		if i == 0 {
			configPath = path.Join(GetFilePath(), defaultFileName)
		} else if i == 1 {
			configPath = path.Join(DefaultConfigDir(), defaultFileName)
		}
	}
	return configPath
}

func DefaultConfigDir() string {
	home := homeDir()
	if home != "" {
		if runtime.GOOS == "darwin" {
			return filepath.Join(home, ".bcmonitor")
		} else if runtime.GOOS == "windows" {
			return filepath.Join(home, "AppData", "Roaming", "bcmonitor")
		} else {
			return filepath.Join(home, ".bcmonitor")
		}
	}

	return ""
}

func homeDir() string {
	if home := os.Getenv("HOME"); home != "" {
		return home
	}

	if usr, err := user.Current(); err == nil {
		return usr.HomeDir
	}

	return ""
}

func GetFilePath() string {
	return filePath
}

//func InitLogger() {
//	//logger.LoadConfiguration(path.Join(rootPath, "log.xml"))
//
//}

func InitLogger() {
	logFile := path.Join(rootPath, "log.xml")
	for i := 0; i < 3; i++ {
		if _, err := os.Stat(logFile); !os.IsNotExist(err) {
			break
		}
		if i == 0 {
			logFile = path.Join(filePath, "log.xml")
		} else if i == 1 {
			logFile = path.Join(DefaultConfigDir(), "log.xml")
		}
	}
	logger.LoadConfiguration(logFile)
}