Avoid wipeout of content on restart with opened editors

The problem is that if the catalogs are not warmed up on first requests
from kaoto UI, the content is wiped out because Kaoto backend seems to
not waiting for the Catalog to be warmed up before returning an answer
and consequently it is providing an empty results as it knows nothing of
the content.

Not found an easy way to provide a non-regression test as it requires a
restart of VS Code (but maybe we can find some alternatives, reload of
workspaces/resources? the thing is that it requires the extension to be
deactivated and reactivated so that the kaoto backend shut down)

fixes #44

Signed-off-by: Aurélien Pupier <[email protected]>

CHANGELOG.md

@@ -3,6 +3,7 @@
 - Keep `Kaoto backend` output log available when Kaoto backend native executable cannot be launched. It allows to have more information what can be the issue.
 - Upgrade embedded Kaoto [UI](https://github.com/KaotoIO/kaoto-ui/releases/tag/v0.6.1) to 0.6.1 and [backend](https://github.com/KaotoIO/kaoto-backend/releases/tag/v0.6.2) to 0.6.2
 - Open Kaoto editor by default for `*.camel.(yaml|yml)` files
+- Avoid wipeout of content on restart with opened editors #144
 
 # 0.2.0
 

package.json

@@ -39,6 +39,7 @@
     "@kie-tools-core/workspace": "^0.26.0",
     "@patternfly/react-core": "4.267.6",
     "@redhat-developer/vscode-redhat-telemetry": "^0.5.4",
+    "async-wait-until": "^2.0.12",
     "react": "18.2.0",
     "react-dom": "18.2.0"
   },

src/extension/extension.ts

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+import { waitUntil } from 'async-wait-until';
 import { backendI18nDefaults, backendI18nDictionaries } from "@kie-tools-core/backend/dist/i18n";
 import { VsCodeBackendProxy } from "@kie-tools-core/backend/dist/vscode";
 import { EditorEnvelopeLocator, EnvelopeContentType, EnvelopeMapping } from "@kie-tools-core/editor/dist/api";
@@ -31,6 +32,7 @@ let telemetryService: TelemetryService;
 
 let backendProcess: child_process.ChildProcessWithoutNullStreams | undefined;
 let kaotoBackendOutputChannel: vscode.OutputChannel | undefined;
+let kaotoBackendWarmedUp: boolean = false;
 
 export async function activate(context: vscode.ExtensionContext) {
   console.info("Kaoto Editor extension is alive.");
@@ -57,6 +59,9 @@ export async function activate(context: vscode.ExtensionContext) {
     if (kaotoBackendOutputChannel) {
       const dec = new TextDecoder("utf-8");
       const text = dec.decode(data);
+      if (!kaotoBackendWarmedUp && text.includes('Catalog class io.kaoto.backend.api.metadata.catalog.StepCatalog_Subclass warmed up in')) {
+        kaotoBackendWarmedUp = true;
+      }
       kaotoBackendOutputChannel.append(text);
     }
   });
@@ -71,6 +76,12 @@ export async function activate(context: vscode.ExtensionContext) {
   const backendI18n = new I18n(backendI18nDefaults, backendI18nDictionaries, vscode.env.language);
   backendProxy = new VsCodeBackendProxy(context, backendI18n);
 
+  try {
+    await waitUntil(() => kaotoBackendWarmedUp, { timeout: 30000});
+  } catch {
+    kaotoBackendOutputChannel.append('Kaoto backend failed to warm up in 30 seconds.\n');
+  }
+
   KogitoVsCode.startExtension({
     extensionName: "redhat.vscode-kaoto",
     context: context,
@@ -88,8 +99,6 @@ export async function activate(context: vscode.ExtensionContext) {
     ]),
     backendProxy: backendProxy,
   });
-
-  console.info("Extension is successfully setup.");
 
   const redhatService = await getRedHatService(context);  
   telemetryService = await redhatService.getTelemetryService();
@@ -106,6 +115,7 @@ function getBinaryName(): string {
 }
 
 export function deactivate() {
+  kaotoBackendWarmedUp = false;
   if (backendProcess !== undefined) {
     if (kaotoBackendOutputChannel !== undefined) {
       kaotoBackendOutputChannel.append(`Kaoto backend is stopped during VS Code extension deactivation.`);

yarn.lock

@@ -1099,6 +1099,11 @@ assertion-error@^1.1.0:
   resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
   integrity sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==
 
+async-wait-until@^2.0.12:
+  version "2.0.12"
+  resolved "https://registry.yarnpkg.com/async-wait-until/-/async-wait-until-2.0.12.tgz#8a94683bf29e74642a8bcbb9385f6ea330d4383f"
+  integrity sha512-SXy/vDs6UPJMG6YeEYOQ4ilA/JnGxk187KPGqFx9O+qVxsjkSl+jH+3P50qSNyMpEmDgr8qOFGOKCJckWb1i7A==
+
 async@^2.6.4:
   version "2.6.4"
   resolved "https://registry.yarnpkg.com/async/-/async-2.6.4.tgz#706b7ff6084664cd7eae713f6f965433b5504221"