feat: Update NginxConfigProvider to return Result with ServiceError for upstream and upstream target

apps/api/src/services/nginx/info/upstream_target.rs

@@ -6,6 +6,7 @@ use uuid::Uuid;
 use database::generated::entities::{upstream, upstream_target};
 
 use crate::{
+    errors::service_error::ServiceError,
     services::nginx::{builder::NginxConfigProvider, traits::indentable::Indentable},
     set_if_some,
 };
@@ -128,8 +129,8 @@ impl From<UpstreamTargetCreateInfo> for upstream_target::ActiveModel {
 }
 
 impl NginxConfigProvider for UpstreamTargetInfo {
-    fn to_nginx_config(&self, indent: Option<usize>) -> String {
-        format!(
+    fn to_nginx_config(&self, indent: Option<usize>) -> Result<String, ServiceError> {
+        Ok(format!(
             "server {}:{} weight={}{}{};",
             self.target_host,
             self.target_port,
@@ -137,7 +138,7 @@ impl NginxConfigProvider for UpstreamTargetInfo {
             if self.is_backup { " backup" } else { "" },
             if !self.enabled { " down" } else { "" },
         )
-        .indent(indent.unwrap_or(0))
+        .indent(indent.unwrap_or(0)))
     }
 }