fix: de-duplicate backend servers list mapped from topology

harmony/src/domain/topology/load_balancer.rs

@@ -28,13 +28,7 @@ pub trait LoadBalancer: Send + Sync {
         &self,
         service: &LoadBalancerService,
     ) -> Result<(), ExecutorError> {
-        debug!(
-            "Listing LoadBalancer services {:?}",
-            self.list_services().await
-        );
-        if !self.list_services().await.contains(service) {
-            self.add_service(service).await?;
-        }
+        self.add_service(service).await?;
         Ok(())
     }
 }

harmony/src/infra/opnsense/load_balancer.rs

@@ -24,19 +24,13 @@ impl LoadBalancer for OPNSenseFirewall {
     }
 
     async fn add_service(&self, service: &LoadBalancerService) -> Result<(), ExecutorError> {
-        warn!(
-            "TODO : the current implementation does not check / cleanup / merge with existing haproxy services properly. Make sure to manually verify that the configuration is correct after executing any operation here"
-        );
         let mut config = self.opnsense_config.write().await;
+        let mut load_balancer = config.load_balancer();
+
         let (frontend, backend, servers, healthcheck) =
             harmony_load_balancer_service_to_haproxy_xml(service);
-        let mut load_balancer = config.load_balancer();
-        load_balancer.add_backend(backend);
-        load_balancer.add_frontend(frontend);
-        load_balancer.add_servers(servers);
-        if let Some(healthcheck) = healthcheck {
-            load_balancer.add_healthcheck(healthcheck);
-        }
+
+        load_balancer.configure_service(frontend, backend, servers, healthcheck);
 
         Ok(())
     }
@@ -104,7 +98,7 @@ pub(crate) fn haproxy_xml_config_to_harmony_loadbalancer(
                 .backends
                 .backends
                 .iter()
-                .find(|b| b.uuid == frontend.default_backend);
+                .find(|b| Some(b.uuid.clone()) == frontend.default_backend);
 
             let mut health_check = None;
             match matching_backend {
@@ -114,8 +108,7 @@ pub(crate) fn haproxy_xml_config_to_harmony_loadbalancer(
                 }
                 None => {
                     warn!(
-                        "HAProxy config could not find a matching backend for frontend {:?}",
-                        frontend
+                        "HAProxy config could not find a matching backend for frontend {frontend:?}"
                     );
                 }
             }
@@ -150,11 +143,11 @@ pub(crate) fn get_servers_for_backend(
         .servers
         .iter()
         .filter_map(|server| {
+            let address = server.address.clone()?;
+            let port = server.port?;
+
             if backend_servers.contains(&server.uuid.as_str()) {
-                return Some(BackendServer {
-                    address: server.address.clone(),
-                    port: server.port,
-                });
+                return Some(BackendServer { address, port });
             }
             None
         })
@@ -322,7 +315,7 @@ pub(crate) fn harmony_load_balancer_service_to_haproxy_xml(
         name: format!("frontend_{}", service.listening_port),
         bind: service.listening_port.to_string(),
         mode: "tcp".to_string(), // TODO do not depend on health check here
-        default_backend: backend.uuid.clone(),
+        default_backend: Some(backend.uuid.clone()),
         ..Default::default()
     };
     info!("HAPRoxy frontend and backend mode currently hardcoded to tcp");
@@ -336,8 +329,8 @@ fn server_to_haproxy_server(server: &BackendServer) -> HAProxyServer {
         uuid: Uuid::new_v4().to_string(),
         name: format!("{}_{}", &server.address, &server.port),
         enabled: 1,
-        address: server.address.clone(),
-        port: server.port,
+        address: Some(server.address.clone()),
+        port: Some(server.port),
         mode: "active".to_string(),
         server_type: "static".to_string(),
         ..Default::default()
@@ -360,8 +353,8 @@ mod tests {
         let mut haproxy = HAProxy::default();
         let server = HAProxyServer {
             uuid: "server1".to_string(),
-            address: "192.168.1.1".to_string(),
-            port: 80,
+            address: Some("192.168.1.1".to_string()),
+            port: Some(80),
             ..Default::default()
         };
         haproxy.servers.servers.push(server);
@@ -386,8 +379,8 @@ mod tests {
         let mut haproxy = HAProxy::default();
         let server = HAProxyServer {
             uuid: "server1".to_string(),
-            address: "192.168.1.1".to_string(),
-            port: 80,
+            address: Some("192.168.1.1".to_string()),
+            port: Some(80),
             ..Default::default()
         };
         haproxy.servers.servers.push(server);
@@ -406,8 +399,8 @@ mod tests {
         let mut haproxy = HAProxy::default();
         let server = HAProxyServer {
             uuid: "server1".to_string(),
-            address: "192.168.1.1".to_string(),
-            port: 80,
+            address: Some("192.168.1.1".to_string()),
+            port: Some(80),
             ..Default::default()
         };
         haproxy.servers.servers.push(server);
@@ -428,16 +421,16 @@ mod tests {
         let mut haproxy = HAProxy::default();
         let server = HAProxyServer {
             uuid: "server1".to_string(),
-            address: "some-hostname.test.mcd".to_string(),
-            port: 80,
+            address: Some("some-hostname.test.mcd".to_string()),
+            port: Some(80),
             ..Default::default()
         };
         haproxy.servers.servers.push(server);
 
         let server = HAProxyServer {
             uuid: "server2".to_string(),
-            address: "192.168.1.2".to_string(),
-            port: 8080,
+            address: Some("192.168.1.2".to_string()),
+            port: Some(8080),
             ..Default::default()
         };
         haproxy.servers.servers.push(server);

harmony/src/modules/okd/bootstrap_load_balancer.rs

@@ -54,6 +54,7 @@ impl OKDBootstrapLoadBalancerScore {
             },
         }
     }
+
     fn topology_to_backend_server(topology: &HAClusterTopology, port: u16) -> Vec<BackendServer> {
         let mut backend: Vec<_> = topology
             .control_plane
@@ -67,6 +68,8 @@ impl OKDBootstrapLoadBalancerScore {
             address: topology.bootstrap_host.ip.to_string(),
             port,
         });
+
+        backend.dedup();
         backend
     }
 }

opnsense-config-xml/src/data/dnsmasq.rs

@@ -36,6 +36,27 @@ pub struct DnsMasq {
     pub dhcp_options: Vec<DhcpOptions>,
     pub dhcp_boot: Vec<DhcpBoot>,
     pub dhcp_tags: Vec<RawXml>,
+    pub hosts: Vec<DnsmasqHost>,
+}
+
+#[derive(Default, PartialEq, Debug, YaSerialize, YaDeserialize, Clone)]
+#[yaserde(rename = "hosts")]
+pub struct DnsmasqHost {
+    #[yaserde(attribute = true)]
+    pub uuid: String,
+    pub host: String,
+    pub domain: MaybeString,
+    pub local: MaybeString,
+    pub ip: MaybeString,
+    pub cnames: MaybeString,
+    pub client_id: MaybeString,
+    pub hwaddr: MaybeString,
+    pub lease_time: MaybeString,
+    pub ignore: Option<u8>,
+    pub set_tag: MaybeString,
+    pub descr: MaybeString,
+    pub comments: MaybeString,
+    pub aliases: MaybeString,
 }
 
 // Represents the <dhcp> element and its nested fields.

opnsense-config-xml/src/data/haproxy.rs

@@ -77,7 +77,7 @@ impl YaSerializeTrait for HAProxyId {
     }
 }
 
-#[derive(PartialEq, Debug)]
+#[derive(PartialEq, Debug, Clone)]
 pub struct HAProxyId(String);
 
 impl Default for HAProxyId {
@@ -310,7 +310,7 @@ pub struct Frontend {
     pub bind_options: MaybeString,
     pub mode: String,
     #[yaserde(rename = "defaultBackend")]
-    pub default_backend: String,
+    pub default_backend: Option<String>,
     pub ssl_enabled: i32,
     pub ssl_certificates: MaybeString,
     pub ssl_default_certificate: MaybeString,
@@ -543,8 +543,8 @@ pub struct HAProxyServer {
     pub enabled: u8,
     pub name: String,
     pub description: MaybeString,
-    pub address: String,
-    pub port: u16,
+    pub address: Option<String>,
+    pub port: Option<u16>,
     pub checkport: MaybeString,
     pub mode: String,
     pub multiplexer_protocol: MaybeString,

opnsense-config-xml/src/data/opnsense.rs

@@ -189,7 +189,7 @@ pub struct System {
     pub timeservers: String,
     pub webgui: WebGui,
     pub usevirtualterminal: u8,
-    pub disablenatreflection: String,
+    pub disablenatreflection: Option<String>,
     pub disableconsolemenu: u8,
     pub disablevlanhwfilter: u8,
     pub disablechecksumoffloading: u8,
@@ -256,7 +256,7 @@ pub struct Firmware {
     #[yaserde(rename = "type")]
     pub firmware_type: MaybeString,
     pub subscription: MaybeString,
-    pub reboot: MaybeString,
+    pub reboot: Option<MaybeString>,
 }
 
 #[derive(Default, PartialEq, Debug, YaSerialize, YaDeserialize)]
@@ -1449,6 +1449,9 @@ pub struct Vip {
     pub advbase: Option<MaybeString>,
     pub advskew: Option<MaybeString>,
     pub descr: Option<MaybeString>,
+    pub peer: Option<MaybeString>,
+    pub peer6: Option<MaybeString>,
+    pub nosync: Option<MaybeString>,
 }
 
 #[derive(Default, PartialEq, Debug, YaSerialize, YaDeserialize)]

opnsense-config/src/config/manager/ssh.rs

@@ -29,8 +29,7 @@ impl SshConfigManager {
 
         self.opnsense_shell
             .exec(&format!(
-                "cp /conf/config.xml /conf/backup/{}",
-                backup_filename
+                "cp /conf/config.xml /conf/backup/{backup_filename}"
             ))
             .await
     }

opnsense-config/src/modules/load_balancer.rs

@@ -1,11 +1,8 @@
-use std::sync::Arc;
-
-use log::warn;
+use crate::{config::OPNsenseShell, Error};
 use opnsense_config_xml::{
     Frontend, HAProxy, HAProxyBackend, HAProxyHealthCheck, HAProxyServer, OPNsense,
 };
-
-use crate::{config::OPNsenseShell, Error};
+use std::{collections::HashSet, sync::Arc};
 
 pub struct LoadBalancerConfig<'a> {
     opnsense: &'a mut OPNsense,
@@ -40,21 +37,67 @@ impl<'a> LoadBalancerConfig<'a> {
         self.with_haproxy(|haproxy| haproxy.general.enabled = enabled as i32);
     }
 
-    pub fn add_backend(&mut self, backend: HAProxyBackend) {
-        warn!("TODO make sure this new backend does not refer non-existing entities like servers or health checks");
-        self.with_haproxy(|haproxy| haproxy.backends.backends.push(backend));
+    /// Configures a service by removing any existing service on the same port
+    /// and then adding the new definition. This ensures idempotency.
+    pub fn configure_service(
+        &mut self,
+        frontend: Frontend,
+        backend: HAProxyBackend,
+        servers: Vec<HAProxyServer>,
+        healthcheck: Option<HAProxyHealthCheck>,
+    ) {
+        self.remove_service_by_bind_address(&frontend.bind);
+        self.remove_servers(&servers);
+
+        self.add_new_service(frontend, backend, servers, healthcheck);
     }
 
-    pub fn add_frontend(&mut self, frontend: Frontend) {
-        self.with_haproxy(|haproxy| haproxy.frontends.frontend.push(frontend));
+    // Remove the corresponding real servers based on their name if they already exist.
+    fn remove_servers(&mut self, servers: &[HAProxyServer]) {
+        let server_names: HashSet<_> = servers.iter().map(|s| s.name.clone()).collect();
+        self.with_haproxy(|haproxy| {
+            haproxy
+                .servers
+                .servers
+                .retain(|s| !server_names.contains(&s.name));
+        });
     }
 
-    pub fn add_healthcheck(&mut self, healthcheck: HAProxyHealthCheck) {
-        self.with_haproxy(|haproxy| haproxy.healthchecks.healthchecks.push(healthcheck));
+    /// Removes a service and its dependent components based on the frontend's bind address.
+    /// This performs a cascading delete of the frontend, backend, servers, and health check.
+    fn remove_service_by_bind_address(&mut self, bind_address: &str) {
+        self.with_haproxy(|haproxy| {
+            let Some(old_frontend) = remove_frontend_by_bind_address(haproxy, bind_address) else {
+                return;
+            };
+
+            let Some(old_backend) = remove_backend(haproxy, old_frontend) else {
+                return;
+            };
+
+            remove_healthcheck(haproxy, &old_backend);
+            remove_linked_servers(haproxy, &old_backend);
+        });
     }
 
-    pub fn add_servers(&mut self, mut servers: Vec<HAProxyServer>) {
-        self.with_haproxy(|haproxy| haproxy.servers.servers.append(&mut servers));
+    /// Adds the components of a new service to the HAProxy configuration.
+    /// This function de-duplicates servers by name to prevent configuration errors.
+    fn add_new_service(
+        &mut self,
+        frontend: Frontend,
+        backend: HAProxyBackend,
+        servers: Vec<HAProxyServer>,
+        healthcheck: Option<HAProxyHealthCheck>,
+    ) {
+        self.with_haproxy(|haproxy| {
+            if let Some(check) = healthcheck {
+                haproxy.healthchecks.healthchecks.push(check);
+            }
+
+            haproxy.servers.servers.extend(servers);
+            haproxy.backends.backends.push(backend);
+            haproxy.frontends.frontend.push(frontend);
+        });
     }
 
     pub async fn reload_restart(&self) -> Result<(), Error> {
@@ -82,3 +125,50 @@ impl<'a> LoadBalancerConfig<'a> {
         Ok(())
     }
 }
+
+fn remove_frontend_by_bind_address(haproxy: &mut HAProxy, bind_address: &str) -> Option<Frontend> {
+    let pos = haproxy
+        .frontends
+        .frontend
+        .iter()
+        .position(|f| f.bind == bind_address);
+
+    match pos {
+        Some(pos) => Some(haproxy.frontends.frontend.remove(pos)),
+        None => None,
+    }
+}
+
+fn remove_backend(haproxy: &mut HAProxy, old_frontend: Frontend) -> Option<HAProxyBackend> {
+    let default_backend = old_frontend.default_backend?;
+    let pos = haproxy
+        .backends
+        .backends
+        .iter()
+        .position(|b| b.uuid == default_backend);
+
+    match pos {
+        Some(pos) => Some(haproxy.backends.backends.remove(pos)),
+        None => None, // orphaned frontend, shouldn't happen
+    }
+}
+
+fn remove_healthcheck(haproxy: &mut HAProxy, backend: &HAProxyBackend) {
+    if let Some(uuid) = &backend.health_check.content {
+        haproxy
+            .healthchecks
+            .healthchecks
+            .retain(|h| h.uuid != *uuid);
+    }
+}
+
+/// Remove the backend's servers. This assumes servers are not shared between services.
+fn remove_linked_servers(haproxy: &mut HAProxy, backend: &HAProxyBackend) {
+    if let Some(server_uuids_str) = &backend.linked_servers.content {
+        let server_uuids_to_remove: HashSet<_> = server_uuids_str.split(',').collect();
+        haproxy
+            .servers
+            .servers
+            .retain(|s| !server_uuids_to_remove.contains(s.uuid.as_str()));
+    }
+}