configuration done in conf/conf.go init()

conf/conf.go

@@ -1,6 +1,11 @@
 package conf
 
-import "sync"
+import (
+	"sync"
+
+	"github.com/beego/beego/logs"
+	"github.com/goraz/onion"
+)
 
 type Config struct {
 	OcCatalogUrl string
@@ -9,6 +14,41 @@ type Config struct {
 var instance *Config
 var once sync.Once
 
+const defaultConfigFile = "/etc/oc/search.json"
+const localConfigFile = "./local_search.json"
+
+
+func init(){
+	
+	configFile := ""
+	var o *onion.Onion
+
+	l3 := onion.NewEnvLayerPrefix("_", "OCSEARCH_")
+	l2, err := onion.NewFileLayer(defaultConfigFile, nil)
+	if err == nil {
+		logs.Info("Config file found : " + defaultConfigFile)
+		configFile = defaultConfigFile
+	}
+	l1, err := onion.NewFileLayer(localConfigFile, nil)
+	if err == nil {
+		logs.Info("Local config file found " + localConfigFile + ", overriding default file")
+		configFile = localConfigFile
+	}
+	if configFile == "" {
+		logs.Info("No config file found, using env")
+		o = onion.New(l3)
+	} else if l1 == nil && l2 == nil {
+		o = onion.New(l1, l2, l3)
+	} else if l1 == nil {
+		o = onion.New(l2, l3)
+	} else if l2 == nil {
+		o = onion.New(l1, l3)
+	}
+
+	GetConfig().OcCatalogUrl = o.GetStringDefault("oc-catalog", "localhost:49618")
+	
+}
+
 func GetConfig() *Config {
 	once.Do(func() {
 		instance = &Config{}