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load_config.go
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load_config.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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"
"io/ioutil"
"log"
"path/filepath"
"sync"
)
var (
configPath string
configLock sync.Mutex
config MOSNConfig
configLoadFunc ConfigLoadFunc = DefaultConfigLoad
)
// ConfigLoadFunc parse a input(usually file path) into a mosn config
type ConfigLoadFunc func(path string) *MOSNConfig
// RegisterConfigLoadFunc can replace a new config load function instead of default
func RegisterConfigLoadFunc(f ConfigLoadFunc) {
configLoadFunc = f
}
func DefaultConfigLoad(path string) *MOSNConfig {
log.Println("load config from : ", path)
content, err := ioutil.ReadFile(path)
if err != nil {
log.Fatalln("[config] [default load] load config failed, ", err)
}
cfg := &MOSNConfig{}
// translate to lower case
err = json.Unmarshal(content, cfg)
if err != nil {
log.Fatalln("[config] [default load] json unmarshal config failed, ", err)
}
return cfg
}
// Load config file and parse
func Load(path string) *MOSNConfig {
configPath, _ = filepath.Abs(path)
if cfg := configLoadFunc(path); cfg != nil {
config = *cfg
}
return &config
}