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/*
* Copyright 2019 Intel Corporation, Inc
*
* 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 (
"encoding/json"
"log"
"os"
"reflect"
)
// Configuration loads up all the values that are used to configure
// backend implementations
type Configuration struct {
CAFile string `json:"ca-file"`
ServerCert string `json:"server-cert"`
ServerKey string `json:"server-key"`
Password string `json:"password"`
DatabaseAddress string `json:"database-address"`
DatabaseType string `json:"database-type"`
PluginDir string `json:"plugin-dir"`
EtcdIP string `json:"etcd-ip"`
EtcdCert string `json:"etcd-cert"`
EtcdKey string `json:"etcd-key"`
EtcdCAFile string `json:"etcd-ca-file"`
KubeConfigDir string `json:"kube-config-dir"`
OVNCentralAddress string `json:"ovn-central-address"`
}
// Config is the structure that stores the configuration
var gConfig *Configuration
// readConfigFile reads the specified smsConfig file to setup some env variables
func readConfigFile(file string) (*Configuration, error) {
f, err := os.Open(file)
if err != nil {
return defaultConfiguration(), err
}
defer f.Close()
// Setup some defaults here
// If the json file has values in it, the defaults will be overwritten
conf := defaultConfiguration()
// Read the configuration from json file
decoder := json.NewDecoder(f)
err = decoder.Decode(conf)
if err != nil {
return conf, err
}
return conf, nil
}
func defaultConfiguration() *Configuration {
cwd, err := os.Getwd()
if err != nil {
log.Println("Error getting cwd. Using .")
cwd = "."
}
return &Configuration{
CAFile: "ca.cert",
ServerCert: "server.cert",
ServerKey: "server.key",
Password: "",
DatabaseAddress: "127.0.0.1",
DatabaseType: "mongo",
PluginDir: cwd,
EtcdIP: "127.0.0.1",
EtcdCert: "etcd.cert",
EtcdKey: "etcd.key",
EtcdCAFile: "etcd-ca.cert",
KubeConfigDir: cwd,
OVNCentralAddress: "127.0.0.1",
}
}
// GetConfiguration returns the configuration for the app.
// It will try to load it if it is not already loaded.
func GetConfiguration() *Configuration {
if gConfig == nil {
conf, err := readConfigFile("k8sconfig.json")
if err != nil {
log.Println("Error loading config file. Using defaults.")
}
gConfig = conf
}
return gConfig
}
// SetConfigValue sets a value in the configuration
// This is mostly used to customize the application and
// should be used carefully.
func SetConfigValue(key string, value string) *Configuration {
c := GetConfiguration()
if value == "" || key == "" {
return c
}
v := reflect.ValueOf(c).Elem()
if v.Kind() == reflect.Struct {
f := v.FieldByName(key)
if f.IsValid() {
if f.CanSet() {
if f.Kind() == reflect.String {
f.SetString(value)
}
}
}
}
return c
}
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