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/*
* Copyright (C) 2017 "IoT.bzh"
* Author Sebastien Douheret <sebastien@iot.bzh>
*
* 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 xdsconfig
import (
"encoding/json"
"os"
"path"
common "github.com/iotbzh/xds-common/golib"
)
type SyncThingConf struct {
BinDir string `json:"binDir"`
Home string `json:"home"`
GuiAddress string `json:"gui-address"`
GuiAPIKey string `json:"gui-apikey"`
}
type XDSServerConf struct {
URL string `json:"url"`
ConnRetry int `json:"connRetry"`
// private/not exported fields
ID string `json:"-"`
APIBaseURL string `json:"-"`
APIPartialURL string `json:"-"`
}
type FileConfig struct {
HTTPPort string `json:"httpPort"`
WebAppDir string `json:"webAppDir"`
LogsDir string `json:"logsDir"`
XDSAPIKey string `json:"xds-apikey"`
ServersConf []XDSServerConf `json:"xdsServers"`
SThgConf *SyncThingConf `json:"syncthing"`
}
// readGlobalConfig reads configuration from a config file.
// Order to determine which config file is used:
// 1/ from command line option: "--config myConfig.json"
// 2/ $HOME/.xds/agent/agent-config.json file
// 3/ /etc/xds/agent/agent-config.json file
func readGlobalConfig(c *Config, confFile string) error {
var fd *os.File
var fCfg = FileConfig{}
searchIn := make([]string, 0, 3)
if confFile != "" {
searchIn = append(searchIn, confFile)
}
if homeDir := common.GetUserHome(); homeDir != "" {
searchIn = append(searchIn, path.Join(homeDir, ".xds", "agent", "agent-config.json"))
}
searchIn = append(searchIn, "/etc/xds/agent/agent-config.json")
var cFile *string
for _, p := range searchIn {
if _, err := os.Stat(p); err == nil {
cFile = &p
break
}
}
if cFile == nil {
c.Log.Infof("No config file found")
// always resolved env vars even if no config file found!
goto resVars
}
c.Log.Infof("Use config file: %s", *cFile)
// TODO move on viper package to support comments in JSON and also
// bind with flags (command line options)
// see https://github.com/spf13/viper#working-with-flags
fd, _ = os.Open(*cFile)
defer func() {
if fd != nil {
fd.Close()
}
}()
// Decode config file content and save it in a first variable
if err := json.NewDecoder(fd).Decode(&fCfg); err != nil {
return err
}
// Decode config file content and overwrite default settings
fd.Seek(0, 0)
json.NewDecoder(fd).Decode(&c.FileConf)
// Disable Syncthing support when there is no syncthing field in config
if fCfg.SThgConf == nil {
c.FileConf.SThgConf = nil
}
// Support environment variables (IOW ${MY_ENV_VAR} syntax) in agent-config.json
resVars:
vars := []*string{
&c.FileConf.LogsDir,
&c.FileConf.WebAppDir,
}
if c.FileConf.SThgConf != nil {
vars = append(vars, &c.FileConf.SThgConf.Home,
&c.FileConf.SThgConf.BinDir)
}
for _, field := range vars {
var err error
*field, err = common.ResolveEnvVar(*field)
if err != nil {
return err
}
}
return nil
}
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