[#158] Rework app settings

Update settings by sighup using one lock/unlock operation

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

cmd/http-gw/settings.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/hex"
 	"fmt"
+	"io"
 	"math"
 	"os"
 	"path"
@@ -505,6 +506,37 @@ func fetchReconnectInterval(cfg *viper.Viper) time.Duration {
 	return reconnect
 }
 
+func fetchIndexPageTemplate(v *viper.Viper, l *zap.Logger) (string, bool) {
+	if !v.GetBool(cfgIndexPageEnabled) {
+		return "", false
+	}
+
+	reader, err := os.Open(v.GetString(cfgIndexPageTemplatePath))
+	if err != nil {
+		l.Warn(logs.FailedToReadIndexPageTemplate, zap.Error(err))
+		return "", true
+	}
+
+	tmpl, err := io.ReadAll(reader)
+	if err != nil {
+		l.Warn(logs.FailedToReadIndexPageTemplate, zap.Error(err))
+		return "", true
+	}
+
+	l.Info(logs.SetCustomIndexPageTemplate)
+	return string(tmpl), true
+}
+
+func fetchDefaultNamespaces(v *viper.Viper) []string {
+	namespaces := v.GetStringSlice(cfgResolveDefaultNamespaces)
+
+	for i := range namespaces { // to be set namespaces in env variable as `HTTP_GW_RESOLVE_BUCKET_DEFAULT_NAMESPACES="" "root"`
+		namespaces[i] = strings.Trim(namespaces[i], "\"")
+	}
+
+	return namespaces
+}
+
 func fetchServers(v *viper.Viper, log *zap.Logger) []ServerInfo {
 	var servers []ServerInfo
 	seen := make(map[string]struct{})