fix: improved debug output and error handling in tray menu code

plugins/plugin-kubectl-tray-menu/src/electron-main.ts

@@ -17,9 +17,9 @@
 import { CreateWindowFunction } from '@kui-shell/core'
 
 /**
- * This logic will be executed in the electron-main process, and is
- * called by Kui core in response to the event issued by
- * `./tray/renderer`, whenever a new electron window opens.
+ * [Main Process]: This logic will be executed in the electron-main
+ * process, and is called by Kui core in response to the event issued
+ * by `./tray/renderer`, whenever a new electron window opens.
  */
 export async function initTray(args: { command: string }, _: unknown, createWindow: CreateWindowFunction) {
   if (args.command === '/tray/init') {

plugins/plugin-kubectl-tray-menu/src/tray/events.ts

@@ -14,20 +14,33 @@
  * limitations under the License.
  */
 
+import Debug from 'debug'
 import { EventEmitter } from 'events'
 
 const refreshEvents = new EventEmitter()
 
+/**
+ * [Main Process] Emit a kubernetes config change event. Called from
+ * electron-main, which is the touchpoint for calls from the renderer
+ * process (below).
+ */
 export function emitRefresh() {
+  Debug('plugin-kubectl-tray-menu/events')('emitRefreshFromMain')
   refreshEvents.emit('/refresh')
 }
 
+/**
+ * [Main Process] This is how tray menu watchers register for
+ * kubernetes config change event .
+ */
 export function onRefresh(cb: () => void) {
   refreshEvents.on('/refresh', cb)
 }
 
+/** [Renderer Process] */
 export async function emitRefreshFromRenderer() {
   try {
+    Debug('plugin-kubectl-tray-menu/events')('emitRefreshFromRenderer')
     const { ipcRenderer } = await import('electron')
     ipcRenderer.send(
       '/exec/invoke',

plugins/plugin-kubectl-tray-menu/src/tray/init.ts

@@ -16,7 +16,7 @@
 
 import { Capabilities } from '@kui-shell/core'
 
-/** Preloader to initialize tray menu */
+/** [Renderer Process] Preloader to initialize tray menu */
 export default async function initTray() {
   if (Capabilities.inElectron() && !process.env.KUI_NO_TRAY_MENU) {
     const { ipcRenderer } = await import('electron')

plugins/plugin-kubectl-tray-menu/src/tray/main.ts

@@ -14,6 +14,14 @@
  * limitations under the License.
  */
 
+/**
+ * [Main Process] This is the logic that will be executed in the
+ * *electron-main* process for tray menu registration. This will be
+ * invoked by our `electron-main.ts`, via the `renderer` function
+ * below, which in turn is called from our `preload.ts`.
+ */
+
+import Debug from 'debug'
 import { CreateWindowFunction } from '@kui-shell/core'
 import { productName } from '@kui-shell/client/config.d/name.json'
 
@@ -25,6 +33,8 @@ import buildContextMenu from './menus'
 let tray: null | InstanceType<typeof import('electron').Tray> = null
 
 class LiveMenu {
+  private readonly debug = Debug('plugin-kubectl-tray-menu/main')
+
   // serialized form, to avoid unnecessary repaints
   private currentContextMenu = ''
 
@@ -33,7 +43,9 @@ class LiveMenu {
     private readonly tray: import('electron').Tray,
     private readonly createWindow: CreateWindowFunction,
     private readonly periodic = setInterval(() => this.render(), 10 * 1000)
-  ) {}
+  ) {
+    this.debug('constructor')
+  }
 
   /** Avoid a flurry of re-renders */
   private debounce: null | ReturnType<typeof setTimeout> = null
@@ -43,14 +55,13 @@ class LiveMenu {
       clearTimeout(this.debounce)
     }
     this.debounce = setTimeout(async () => {
+      this.debug('render')
       try {
         // avoid blinking on linux by constantly repainting: only update
         // the tray if the model has changed
         const newContextMenu = await buildContextMenu(this.createWindow, this.render.bind(this))
-        const newContextMenuSerialized = JSON.stringify(
-          newContextMenu,
-          (key, value) => (key === 'menu' || key === 'commandsMap' || key === 'commandId' ? undefined : value),
-          2
+        const newContextMenuSerialized = JSON.stringify(newContextMenu, (key, value) =>
+          key === 'menu' || key === 'commandsMap' || key === 'commandId' ? undefined : value
         )
         if (this.currentContextMenu !== newContextMenuSerialized) {
           this.currentContextMenu = newContextMenuSerialized
@@ -65,10 +76,10 @@ class LiveMenu {
 }
 
 /**
- * This is the logic that will be executed in the *electron-main*
- * process for tray menu registration. This will be invoked by our
- * `electron-main.ts`, via the `renderer` function below, which in
- * turn is called from our `preload.ts`.
+ * [Main Process] This is the logic that will be executed in the
+ * *electron-main* process for tray menu registration. This will be
+ * invoked by our `electron-main.ts`, via the `renderer` function
+ * below, which in turn is called from our `preload.ts`.
  */
 export default async function main(createWindow: CreateWindowFunction) {
   if (tray) {

plugins/plugin-kubectl-tray-menu/src/tray/menus/contexts/current.ts

@@ -20,14 +20,19 @@ import { tellRendererToExecute } from '@kui-shell/core'
 export async function get() {
   const { execFile } = await import('child_process')
   return new Promise<string>((resolve, reject) => {
-    execFile('kubectl', ['config', 'current-context'], { windowsHide: true }, (err, stdout, stderr) => {
-      if (err) {
-        console.error(stderr)
-        reject(err)
-      } else {
-        resolve(stdout.trim())
-      }
-    })
+    try {
+      execFile('kubectl', ['config', 'current-context'], { windowsHide: true }, (err, stdout, stderr) => {
+        if (err) {
+          console.error(stderr)
+          reject(err)
+        } else {
+          resolve(stdout.trim())
+        }
+      })
+    } catch (err) {
+      console.error('Error starting current namespace process', err)
+      reject(err)
+    }
   })
 }
 
@@ -37,18 +42,29 @@ export async function set(context: string, tellRenderer = true) {
 
   if (tellRenderer) {
     // inform the renderer that we have a context-related change
-    tellRendererToExecute('kubectl ' + args.join(' '))
+    setTimeout(() => {
+      try {
+        tellRendererToExecute('kubectl ' + args.join(' '))
+      } catch (err) {
+        console.error('Error communicating context change to renderer', err)
+      }
+    }, 200)
   }
 
   const { execFile } = await import('child_process')
   return new Promise<string>((resolve, reject) => {
-    execFile('kubectl', args, { windowsHide: true }, (err, stdout, stderr) => {
-      if (err) {
-        console.error(stderr)
-        reject(err)
-      } else {
-        resolve(stdout.trim())
-      }
-    })
+    try {
+      execFile('kubectl', args, { windowsHide: true }, (err, stdout, stderr) => {
+        if (err) {
+          console.error(stderr)
+          reject(err)
+        } else {
+          resolve(stdout.trim())
+        }
+      })
+    } catch (err) {
+      console.error('Error starting use-context process', err)
+      reject(err)
+    }
   })
 }

plugins/plugin-kubectl-tray-menu/src/tray/menus/contexts/index.ts

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+import Debug from 'debug'
 import { MenuItemConstructorOptions } from 'electron'
 import { CreateWindowFunction } from '@kui-shell/core'
 
@@ -24,40 +25,61 @@ import UpdateFunction from '../../update'
 import { invalidate } from '../namespaces'
 
 class ContextWatcher {
+  private readonly debug = Debug('plugin-kubectl-tray-menu/context-watcher')
+
   public constructor(
     private readonly updateFn: UpdateFunction,
     private _contexts: MenuItemConstructorOptions[] = [Loading]
   ) {
+    this.debug('constructor')
     setTimeout(() => this.scan())
-    onRefresh(() => this.findAndSetCurrentContext(this.contexts))
+    onRefresh(this.refresh)
+  }
+
+  /** Refresh content, e.g. because the model changed in the renderer */
+  private readonly refresh = () => {
+    this.debug('refresh')
+    setTimeout(() => this.findAndSetCurrentContext(this.contexts))
   }
 
+  /** Re-generate menu model from current data */
   private async findAndSetCurrentContext(
     contexts: MenuItemConstructorOptions[],
     currentContextP = get().catch(() => '')
   ) {
-    const currentContext = await currentContextP
+    try {
+      this.debug('findAndSetCurrentContext', contexts.length)
+      const currentContext = await currentContextP
 
-    const oldCur = contexts.find(_ => _.checked)
-    const newCur = contexts.find(_ => _.id === currentContext)
-    if (oldCur) {
-      oldCur.checked = false
-    }
-    if (newCur) {
-      newCur.checked = true
+      const oldCur = contexts.find(_ => _.checked)
+      const newCur = contexts.find(_ => _.id === currentContext)
+      if (oldCur) {
+        oldCur.checked = false
+      }
+      if (newCur) {
+        newCur.checked = true
+      }
+
+      this.contexts = contexts
+    } catch (err) {
+      this.debug('findAndSetCurrentContext failure', err.message)
     }
+  }
 
-    this.contexts = contexts
+  private none(): MenuItemConstructorOptions[] {
+    return [{ label: '<none>', enabled: false }]
   }
 
-  private async setAndScan(cluster: string) {
-    await set(cluster)
+  private async setAndScan(context: string) {
+    this.debug('setAndScan')
+    await set(context)
     this._contexts = []
     invalidate()
     this.scan()
   }
 
   private async scan() {
+    this.debug('scan')
     const currentContextP = get().catch(() => '')
 
     const { execFile } = await import('child_process')
@@ -66,13 +88,14 @@ class ContextWatcher {
       ['config', 'get-contexts', '--output=name'],
       { windowsHide: true },
       async (err, stdout, stderr) => {
+        this.debug('scan done', !!err)
         if (err) {
           if (!/ENOENT/.test(err.message)) {
             // ENOENT if kubectl is not found
             console.error('Error scanning Kubernetes contexts', err.message)
             console.error(stderr)
           }
-          this.contexts = [{ label: '<none>', enabled: false }]
+          this.contexts = this.none()
         } else {
           const contexts: Record<string, string> = stdout
             .split(/\n/)

plugins/plugin-kubectl-tray-menu/src/tray/menus/namespaces/current.ts

@@ -20,19 +20,24 @@ import { tellRendererToExecute } from '@kui-shell/core'
 export async function get() {
   const { execFile } = await import('child_process')
   return new Promise<string>((resolve, reject) => {
-    execFile(
-      'kubectl',
-      ['config', 'view', '--minify', '--output=jsonpath={..namespace}'],
-      { windowsHide: true },
-      (err, stdout, stderr) => {
-        if (err) {
-          console.error(stderr)
-          reject(err)
-        } else {
-          resolve(stdout.trim())
+    try {
+      execFile(
+        'kubectl',
+        ['config', 'view', '--minify', '--output=jsonpath={..namespace}'],
+        { windowsHide: true },
+        (err, stdout, stderr) => {
+          if (err) {
+            console.error(stderr)
+            reject(err)
+          } else {
+            resolve(stdout.trim())
+          }
         }
-      }
-    )
+      )
+    } catch (err) {
+      console.error('Error starting current context process', err)
+      reject(err)
+    }
   })
 }
 
@@ -42,18 +47,29 @@ export async function set(ns: string, tellRenderer = true) {
 
   if (tellRenderer) {
     // inform the renderer that we have a context-related change
-    tellRendererToExecute('kubectl ' + args.join(' '))
+    setTimeout(() => {
+      try {
+        tellRendererToExecute('kubectl ' + args.join(' '))
+      } catch (err) {
+        console.error('Error communicating namespace change to renderer', err)
+      }
+    }, 200)
   }
 
   const { execFile } = await import('child_process')
   return new Promise<string>((resolve, reject) => {
-    execFile('kubectl', args, { windowsHide: true }, (err, stdout, stderr) => {
-      if (err) {
-        console.error(stderr)
-        reject(err)
-      } else {
-        resolve(stdout.trim())
-      }
-    })
+    try {
+      execFile('kubectl', args, { windowsHide: true }, (err, stdout, stderr) => {
+        if (err) {
+          console.error(stderr)
+          reject(err)
+        } else {
+          resolve(stdout.trim())
+        }
+      })
+    } catch (err) {
+      console.error('Error starting namespace set-current process', err)
+      reject(err)
+    }
   })
 }