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|
package xdsconfig
import (
"encoding/json"
"os"
"os/user"
"path"
"path/filepath"
"strings"
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"`
RescanIntervalS int `json:"rescanIntervalS"`
}
type FileConfig struct {
WebAppDir string `json:"webAppDir"`
ShareRootDir string `json:"shareRootDir"`
SdkRootDir string `json:"sdkRootDir"`
HTTPPort string `json:"httpPort"`
SThgConf *SyncThingConf `json:"syncthing"`
LogsDir string `json:"logsDir"`
}
// getConfigFromFile 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/config.json file
// 3/ <current_dir>/config.json file
// 4/ <xds-server executable dir>/config.json file
func updateConfigFromFile(c *Config, confFile string) error {
searchIn := make([]string, 0, 3)
if confFile != "" {
searchIn = append(searchIn, confFile)
}
if usr, err := user.Current(); err == nil {
searchIn = append(searchIn, path.Join(usr.HomeDir, ".xds", "config.json"))
}
cwd, err := os.Getwd()
if err == nil {
searchIn = append(searchIn, path.Join(cwd, "config.json"))
}
exePath, err := filepath.Abs(filepath.Dir(os.Args[0]))
if err == nil {
searchIn = append(searchIn, path.Join(exePath, "config.json"))
}
var cFile *string
for _, p := range searchIn {
if _, err := os.Stat(p); err == nil {
cFile = &p
break
}
}
if cFile == nil {
// No config file found
return nil
}
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 fd.Close()
fCfg := FileConfig{}
if err := json.NewDecoder(fd).Decode(&fCfg); err != nil {
return err
}
// Support environment variables (IOW ${MY_ENV_VAR} syntax) in config.json
for _, field := range []*string{
&fCfg.WebAppDir,
&fCfg.ShareRootDir,
&fCfg.SdkRootDir,
&fCfg.LogsDir,
&fCfg.SThgConf.Home,
&fCfg.SThgConf.BinDir} {
var err error
if *field, err = common.ResolveEnvVar(*field); err != nil {
return err
}
}
// Use config file settings else use default config
if fCfg.WebAppDir == "" {
fCfg.WebAppDir = c.FileConf.WebAppDir
}
if fCfg.ShareRootDir == "" {
fCfg.ShareRootDir = c.FileConf.ShareRootDir
}
if fCfg.SdkRootDir == "" {
fCfg.SdkRootDir = c.FileConf.SdkRootDir
}
if fCfg.HTTPPort == "" {
fCfg.HTTPPort = c.FileConf.HTTPPort
}
// Resolve webapp dir (support relative or full path)
fCfg.WebAppDir = strings.Trim(fCfg.WebAppDir, " ")
if !strings.HasPrefix(fCfg.WebAppDir, "/") && exePath != "" {
// Check first from current directory
for _, rootD := range []string{cwd, exePath} {
ff := path.Join(rootD, fCfg.WebAppDir, "index.html")
if common.Exists(ff) {
fCfg.WebAppDir = path.Join(rootD, fCfg.WebAppDir)
break
}
}
}
c.FileConf = fCfg
return nil
}
|
