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/config.json file func readGlobalConfig(c *Config, confFile string) error { 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") 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() // Decode config file content and save it in a first variable fCfg := FileConfig{} 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 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 }