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-rw-r--r--lib/xdsconfig/configfile.go109
1 files changed, 109 insertions, 0 deletions
diff --git a/lib/xdsconfig/configfile.go b/lib/xdsconfig/configfile.go
new file mode 100644
index 0000000..e3737f4
--- /dev/null
+++ b/lib/xdsconfig/configfile.go
@@ -0,0 +1,109 @@
+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
+}