feat: Add a nop replacement for remote Navie

This provider effectively disables remote Navie and prevents
transmission of any data.

packages/cli/src/cmds/index/index.ts

@@ -21,10 +21,10 @@ import RPCServer from './rpcServer';
 import appmapData from '../../rpc/appmap/data';
 import { appmapStatsV1, appmapStatsV2 } from '../../rpc/appmap/stats';
 import LocalNavie from '../../rpc/explain/navie/navie-local';
-import RemoteNavie from '../../rpc/explain/navie/navie-remote';
 import { InteractionEvent } from '@appland/navie/dist/interaction-history';
 import { update } from '../../rpc/file/update';
 import { AI_KEY_ENV_VARS } from './aiEnvVar';
+import NopNavie from '../../rpc/explain/navie/navie-nop';
 
 export const command = 'index';
 export const describe =
@@ -131,11 +131,7 @@ export const handler = async (argv) => {
         navie.on('event', logEvent);
         return navie;
       };
-      const buildRemoteNavie = (
-        contextProvider: ContextV2.ContextProvider,
-        projectInfoProvider: ProjectInfo.ProjectInfoProvider,
-        helpProvider: Help.HelpProvider
-      ) => new RemoteNavie(contextProvider, projectInfoProvider, helpProvider);
+      const buildRemoteNavie = () => new NopNavie();
 
       const navieProvider = useLocalNavie() ? buildLocalNavie : buildRemoteNavie;
 

packages/cli/src/cmds/navie.ts

@@ -15,14 +15,15 @@ import { configureRpcDirectories } from '../lib/handleWorkingDirectory';
 import { explainHandler } from '../rpc/explain/explain';
 import INavie, { INavieProvider } from '../rpc/explain/navie/inavie';
 import LocalNavie from '../rpc/explain/navie/navie-local';
-import RemoteNavie from '../rpc/explain/navie/navie-remote';
+import type RemoteNavie from '../rpc/explain/navie/navie-remote';
 import detectAIEnvVar, { AI_KEY_ENV_VARS } from './index/aiEnvVar';
 import detectCodeEditor from '../lib/detectCodeEditor';
 import { verbose } from '../utils';
 import Trajectory from '../rpc/explain/navie/trajectory';
 import { serveAndOpenNavie } from '../lib/serveAndOpen';
 import RPCServer from './index/rpcServer';
 import { rpcMethods } from './index/rpc';
+import NopNavie from '../rpc/explain/navie/navie-nop';
 
 interface ExplainArgs {
   verbose: boolean;
@@ -136,7 +137,7 @@ export function buildNavieProvider(argv: ExplainArgs) {
     return false;
   };
 
-  const applyAIOptions = (navie: LocalNavie | RemoteNavie) => {
+  const applyAIOptions = (navie: LocalNavie | RemoteNavie | NopNavie) => {
     if (aiOptions) {
       for (const option of aiOptions) {
         const [key, value] = option.split('=');
@@ -183,13 +184,9 @@ export function buildNavieProvider(argv: ExplainArgs) {
     return navie;
   };
 
-  const buildRemoteNavie = (
-    contextProvider: ContextV2.ContextProvider,
-    projectInfoProvider: ProjectInfo.ProjectInfoProvider,
-    helpProvider: Help.HelpProvider
-  ) => {
+  const buildRemoteNavie = () => {
     loadConfiguration(true);
-    const navie = new RemoteNavie(contextProvider, projectInfoProvider, helpProvider);
+    const navie = new NopNavie();
     applyAIOptions(navie);
 
     if (argv.threadId) {

packages/cli/src/rpc/explain/navie/navie-nop.ts

@@ -0,0 +1,24 @@
+import EventEmitter from 'events';
+import { default as INavie } from './inavie';
+
+export default class NopNavie extends EventEmitter implements INavie {
+  public readonly providerName = 'nop';
+
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  setOption(key: string, _value: string | number) {
+    throw new Error(`NopNavie does not support option '${key}'`);
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  ask(_threadId: string, _question: string, _codeSelection?: string, _prompt?: string) {
+    this.emit(
+      'error',
+      new Error(`AppMap is transitioning to a fully open-source model where you bring your own LLM, giving you complete control and ensuring your data stays with you.
+
+With this change, the free hosted service is offline, but you can continue using Navie by configuring your own LLM provider.
+
+For guidance on using other LLM providers such as OpenAI and Copilot, [check out our documentation](https://appmap.io/docs/using-navie-ai/bring-your-own-model.html).`)
+    );
+    return Promise.resolve();
+  }
+}

packages/cli/tests/unit/rpc/explain/nop-navie.spec.ts

@@ -0,0 +1,21 @@
+/* eslint-disable @typescript-eslint/no-unsafe-assignment */
+import NopNavie from '../../../../src/rpc/explain/navie/navie-nop';
+
+describe('NopNavie', () => {
+  let navie: NopNavie;
+
+  beforeEach(() => {
+    navie = new NopNavie();
+  });
+
+  it('is disabled', async () => {
+    const onError = jest.fn();
+    navie.on('error', onError);
+    await navie.ask('threadId', 'question');
+    expect(onError).toHaveBeenCalledWith(
+      expect.objectContaining({
+        message: expect.stringContaining('the free hosted service is offline'),
+      })
+    );
+  });
+});