Allow to configure default namespace used in terminal (#3706)

* Allow to configure default namespace used in terminal

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Fix lint issues

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

src/main/cluster.ts

@@ -216,6 +216,18 @@ export class Cluster implements ClusterModel, ClusterState {
     return toJS({ prometheus, prometheusProvider });
   }
 
+  /**
+   * defaultNamespace preference
+   *
+   * @computed
+   * @internal
+   */
+  @computed get defaultNamespace(): string {
+    const { defaultNamespace } = this.preferences;
+
+    return defaultNamespace;
+  }
+
   constructor(model: ClusterModel) {
     makeObservable(this);
     this.id = model.id;
@@ -298,10 +310,25 @@ export class Cluster implements ClusterModel, ClusterState {
           clearInterval(refreshTimer);
           clearInterval(refreshMetadataTimer);
         },
+        reaction(() => this.defaultNamespace, () => this.recreateProxyKubeconfig()),
       );
     }
   }
 
+  /**
+   * @internal
+   */
+  async recreateProxyKubeconfig() {
+    logger.info("Recreate proxy kubeconfig");
+
+    try {
+      this.kubeconfigManager.clear();
+    } catch {
+      // do nothing
+    }
+    this.getProxyKubeconfig();
+  }
+
   /**
    * internal
    */

src/main/kubeconfig-manager.ts

@@ -56,6 +56,15 @@ export class KubeconfigManager {
     return this.tempFile;
   }
 
+  async clear() {
+    if (!this.tempFile) {
+      return;
+    }
+
+    logger.info(`Deleting temporary kubeconfig: ${this.tempFile}`);
+    await fs.unlink(this.tempFile);
+  }
+
   async unlink() {
     if (!this.tempFile) {
       return;
@@ -106,7 +115,7 @@ export class KubeconfigManager {
           user: "proxy",
           name: contextName,
           cluster: contextName,
-          namespace: kubeConfig.getContextObject(contextName).namespace,
+          namespace: cluster.defaultNamespace || kubeConfig.getContextObject(contextName).namespace,
         }
       ]
     };