feat: improve streaming and startup responsiveness

src/main/startup-prerequisites.ts

@@ -0,0 +1,61 @@
+export type StartupPrerequisiteDependencies<ConfiguredRuntime> = {
+  prepareDeepSeekHome: () => Promise<void>
+  initializeKnowledgeAndGateway: () => Promise<void>
+  hydrateConfiguredRuntime: () => Promise<ConfiguredRuntime>
+  initializeAssistant: () => void
+}
+
+function startObserved<T>(operation: () => Promise<T>): Promise<T> {
+  let started: Promise<T>
+  try {
+    started = Promise.resolve(operation())
+  } catch (error) {
+    started = Promise.reject(error)
+  }
+  void started.catch(() => undefined)
+  return started
+}
+
+export async function runStartupPrerequisites<ConfiguredRuntime>(
+  dependencies: StartupPrerequisiteDependencies<ConfiguredRuntime>
+): Promise<ConfiguredRuntime> {
+  const deepSeekHomeReady = startObserved(
+    dependencies.prepareDeepSeekHome
+  )
+  const knowledgeAndGatewayReady = startObserved(
+    dependencies.initializeKnowledgeAndGateway
+  )
+  const configuredRuntimeReady = startObserved(
+    dependencies.hydrateConfiguredRuntime
+  )
+
+  let assistantInitializationFailed = false
+  let assistantInitializationError: unknown
+  try {
+    dependencies.initializeAssistant()
+  } catch (error) {
+    assistantInitializationFailed = true
+    assistantInitializationError = error
+  }
+
+  const [deepSeekHome, knowledgeAndGateway, configuredRuntime] =
+    await Promise.allSettled([
+      deepSeekHomeReady,
+      knowledgeAndGatewayReady,
+      configuredRuntimeReady
+    ] as const)
+
+  if (assistantInitializationFailed) {
+    throw assistantInitializationError
+  }
+  if (deepSeekHome.status === 'rejected') {
+    throw deepSeekHome.reason
+  }
+  if (knowledgeAndGateway.status === 'rejected') {
+    throw knowledgeAndGateway.reason
+  }
+  if (configuredRuntime.status === 'rejected') {
+    throw configuredRuntime.reason
+  }
+  return configuredRuntime.value
+}