feat: K8s apply function now correctly emulates kubectl apply behavior by either creating or updating resources (#55)

Reviewed-on: https://git.nationtech.io/NationTech/harmony/pulls/55
Co-authored-by: Jean-Gabriel Gill-Couture <jg@nationtech.io>
Co-committed-by: Jean-Gabriel Gill-Couture <jg@nationtech.io>

examples/lamp/src/main.rs

@@ -4,7 +4,7 @@ use harmony::{
     maestro::Maestro,
     modules::{
         lamp::{LAMPConfig, LAMPScore},
-        monitoring::monitoring_alerting::{AlertChannel, MonitoringAlertingStackScore},
+        monitoring::monitoring_alerting::MonitoringAlertingStackScore,
     },
     topology::{K8sAnywhereTopology, Url},
 };
@@ -43,9 +43,6 @@ async fn main() {
     .await
     .unwrap();
 
-    let url = url::Url::parse("https://discord.com/api/webhooks/dummy_channel/dummy_token")
-        .expect("invalid URL");
-
     let mut monitoring_stack_score = MonitoringAlertingStackScore::new();
     monitoring_stack_score.namespace = Some(lamp_stack.config.namespace.clone());
 

harmony/src/domain/topology/k8s.rs

@@ -2,7 +2,7 @@ use derive_new::new;
 use k8s_openapi::{ClusterResourceScope, NamespaceResourceScope};
 use kube::{
     Api, Client, Config, Error, Resource,
-    api::PostParams,
+    api::{Patch, PatchParams},
     config::{KubeConfigOptions, Kubeconfig},
 };
 use log::{debug, error, trace};
@@ -20,7 +20,10 @@ impl K8sClient {
         })
     }
 
-    pub async fn apply<K>(&self, resource: &K, ns: Option<&str>) -> Result<K, Error>
+    /// Apply a resource in namespace
+    ///
+    /// See `kubectl apply` for more information on the expected behavior of this function
+    pub async fn apply<K>(&self, resource: &K, namespace: Option<&str>) -> Result<K, Error>
     where
         K: Resource + Clone + std::fmt::Debug + DeserializeOwned + serde::Serialize,
         <K as Resource>::Scope: ApplyStrategy<K>,
@@ -29,12 +32,21 @@ impl K8sClient {
         debug!(
             "Applying resource {:?} with ns {:?}",
             resource.meta().name,
-            ns
+            namespace
         );
         trace!("{:#?}", serde_json::to_string(resource));
 
-        let api: Api<K> = <<K as Resource>::Scope as ApplyStrategy<K>>::get_api(&self.client, ns);
-        api.create(&PostParams::default(), &resource).await
+        let api: Api<K> =
+            <<K as Resource>::Scope as ApplyStrategy<K>>::get_api(&self.client, namespace);
+        // api.create(&PostParams::default(), &resource).await
+        let patch_params = PatchParams::apply("harmony");
+        let name = resource
+            .meta()
+            .name
+            .as_ref()
+            .expect("K8s Resource should have a name");
+        api.patch(name, &patch_params, &Patch::Apply(resource))
+            .await
     }
 
     pub async fn apply_many<K>(&self, resource: &Vec<K>, ns: Option<&str>) -> Result<Vec<K>, Error>

harmony/src/domain/topology/k8s_anywhere.rs

@@ -1,4 +1,4 @@
-use std::{io::Error, process::Command, sync::Arc};
+use std::{process::Command, sync::Arc};
 
 use async_trait::async_trait;
 use inquire::Confirm;
@@ -25,7 +25,7 @@ use super::{
 
 struct K8sState {
     client: Arc<K8sClient>,
-    source: K8sSource,
+    _source: K8sSource,
     message: String,
 }
 
@@ -122,7 +122,7 @@ impl K8sAnywhereTopology {
                 Some(client) => {
                     return Ok(Some(K8sState {
                         client: Arc::new(client),
-                        source: K8sSource::Kubeconfig,
+                        _source: K8sSource::Kubeconfig,
                         message: format!("Loaded k8s client from kubeconfig {kubeconfig}"),
                     }));
                 }
@@ -162,7 +162,7 @@ impl K8sAnywhereTopology {
         let state = match k3d.get_client().await {
             Ok(client) => K8sState {
                 client: Arc::new(K8sClient::new(client)),
-                source: K8sSource::LocalK3d,
+                _source: K8sSource::LocalK3d,
                 message: "Successfully installed K3D cluster and acquired client".to_string(),
             },
             Err(_) => todo!(),

harmony/src/domain/topology/oberservability/monitoring.rs

@@ -1,7 +1,6 @@
 use async_trait::async_trait;
 
 use std::fmt::Debug;
-use url::Url;
 
 use crate::interpret::InterpretError;
 

harmony/src/domain/topology/tenant/k8s.rs

@@ -3,12 +3,9 @@ use std::sync::Arc;
 use crate::{data::Id, executors::ExecutorError, topology::k8s::K8sClient};
 use async_trait::async_trait;
 use derive_new::new;
-use k8s_openapi::{
-    NamespaceResourceScope,
-    api::{
+use k8s_openapi::api::{
     core::v1::{Namespace, ResourceQuota},
     networking::v1::NetworkPolicy,
-    },
 };
 use kube::Resource;
 use serde::de::DeserializeOwned;

harmony/src/modules/helm/command.rs

@@ -311,7 +311,7 @@ impl<T: Topology + K8sclient + HelmCommand> Interpret<T> for HelmChartInterpretV
         _inventory: &Inventory,
         _topology: &T,
     ) -> Result<Outcome, InterpretError> {
-        let ns = self
+        let _ns = self
             .score
             .chart
             .namespace
@@ -339,7 +339,7 @@ impl<T: Topology + K8sclient + HelmCommand> Interpret<T> for HelmChartInterpretV
 
         let res = helm_executor.generate();
 
-        let output = match res {
+        let _output = match res {
             Ok(output) => output,
             Err(err) => return Err(InterpretError::new(err.to_string())),
         };