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config.go
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config.go
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/*
Copyright Greg Haskins <gregory.haskins@gmail.com> 2017, All Rights Reserved.
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package config
import (
"fmt"
"os"
"path/filepath"
"github.com/spf13/viper"
)
func dirExists(path string) bool {
fi, err := os.Stat(path)
if err != nil {
return false
}
return fi.IsDir()
}
func AddConfigPath(v *viper.Viper, p string) {
if v != nil {
v.AddConfigPath(p)
} else {
viper.AddConfigPath(p)
}
}
//----------------------------------------------------------------------------------
// TranslatePath()
//----------------------------------------------------------------------------------
// Translates a relative path into a fully qualified path relative to the config
// file that specified it. Absolute paths are passed unscathed.
//----------------------------------------------------------------------------------
func TranslatePath(base, p string) string {
if filepath.IsAbs(p) {
return p
}
return filepath.Join(base, p)
}
//----------------------------------------------------------------------------------
// TranslatePathInPlace()
//----------------------------------------------------------------------------------
// Translates a relative path into a fully qualified path in-place (updating the
// pointer) relative to the config file that specified it. Absolute paths are
// passed unscathed.
//----------------------------------------------------------------------------------
func TranslatePathInPlace(base string, p *string) {
*p = TranslatePath(base, *p)
}
//----------------------------------------------------------------------------------
// GetPath()
//----------------------------------------------------------------------------------
// GetPath allows configuration strings that specify a (config-file) relative path
//
// For example: Assume our config is located in /etc/hyperledger/fabric/core.yaml with
// a key "msp.configPath" = "msp/config.yaml".
//
// This function will return:
// GetPath("msp.configPath") -> /etc/hyperledger/fabric/msp/config.yaml
//
//----------------------------------------------------------------------------------
func GetPath(key string) string {
p := viper.GetString(key)
if p == "" {
return ""
}
return TranslatePath(filepath.Dir(viper.ConfigFileUsed()), p)
}
const OfficialPath = "/etc/hyperledger/fabric"
//----------------------------------------------------------------------------------
// InitViper()
//----------------------------------------------------------------------------------
// Performs basic initialization of our viper-based configuration layer.
// Primary thrust is to establish the paths that should be consulted to find
// the configuration we need. If v == nil, we will initialize the global
// Viper instance
//----------------------------------------------------------------------------------
func InitViper(v *viper.Viper, configName string) error {
var altPath = os.Getenv("FABRIC_CFG_PATH")
if altPath != "" {
// If the user has overridden the path with an envvar, its the only path
// we will consider
if !dirExists(altPath) {
return fmt.Errorf("FABRIC_CFG_PATH %s does not exist", altPath)
}
AddConfigPath(v, altPath)
} else {
// If we get here, we should use the default paths in priority order:
//
// *) CWD
// *) /etc/hyperledger/fabric
// CWD
AddConfigPath(v, "./")
// And finally, the official path
if dirExists(OfficialPath) {
AddConfigPath(v, OfficialPath)
}
}
// Now set the configuration file.
if v != nil {
v.SetConfigName(configName)
} else {
viper.SetConfigName(configName)
}
return nil
}