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// Copyright 2014 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 common
import (
"flag"
"fmt"
"os"
"github.com/rakyll/globalconf"
)
// Config struct
type ConfigManager struct {
ExecPath string
Debug bool
Diff bool
DiffType string
Paranoia bool
VmType int
conf *globalconf.GlobalConf
}
// Read config
//
// Initialize Config from Config File
func ReadConfig(ConfigFile string, Datadir string, EnvPrefix string) *ConfigManager {
if !FileExist(ConfigFile) {
// create ConfigFile if it does not exist, otherwise
// globalconf will panic when trying to persist flags.
fmt.Printf("config file '%s' doesn't exist, creating it\n", ConfigFile)
os.Create(ConfigFile)
}
g, err := globalconf.NewWithOptions(&globalconf.Options{
Filename: ConfigFile,
EnvPrefix: EnvPrefix,
})
if err != nil {
fmt.Println(err)
} else {
g.ParseAll()
}
cfg := &ConfigManager{ExecPath: Datadir, Debug: true, conf: g, Paranoia: true}
return cfg
}
// provides persistence for flags
func (c *ConfigManager) Save(key string, value interface{}) {
f := &flag.Flag{Name: key, Value: newConfValue(value)}
c.conf.Set("", f)
}
func (c *ConfigManager) Delete(key string) {
c.conf.Delete("", key)
}
// private type implementing flag.Value
type confValue struct {
value string
}
// generic constructor to allow persising non-string values directly
func newConfValue(value interface{}) *confValue {
return &confValue{fmt.Sprintf("%v", value)}
}
func (self confValue) String() string { return self.value }
func (self confValue) Set(s string) error { self.value = s; return nil }
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