Added webapp Dashboard + logic to interact with server.

[src/xds/xds-agent.git] / lib / xdsconfig / configfile.go

diff --git a/lib/xdsconfig/configfile.go b/lib/xdsconfig/configfile.go
new file mode 100644 (file)
index 0000000..a47038b
--- /dev/null
+++ b/lib/xdsconfig/configfile.go
@@ -0,0 +1,112 @@
+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"`
+       // SEB A SUP ? 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/ <current_dir>/agent-config.json file
+//  4/ <executable dir>/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")
+
+       searchIn = append(searchIn, path.Join(common.GetExePath(), "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
+}