fix: Better error message when server not configured

The old message misleadingly claimed that an offline scan would
commence. New message instead provides a hint on how to enable it.

src/cli/ci/command.ts

@@ -82,7 +82,7 @@ export default {
 
       const configData = await parseConfigFile(config);
 
-      const scanner = buildScanner(false, configData, files);
+      const scanner = await buildScanner(false, configData, files);
 
       const [rawScanResults, findingStatuses]: [ScanResults, FindingStatusListItem[]] =
         await Promise.all([scanner.scan(), scanner.fetchFindingStatus(appIdArg, appmapDir)]);

src/cli/scan/command.ts

@@ -86,7 +86,11 @@ export default {
 
       const configData = await parseConfigFile(config);
 
-      const scanner = buildScanner(reportAllFindings, configData, files);
+      const scanner = await buildScanner(reportAllFindings, configData, files).catch(
+        (error: Error) => {
+          throw new ValidationError(error.message + '\nUse --all to perform an offline scan.');
+        }
+      );
 
       const startTime = Date.now();
 

src/cli/scan/scanner.ts

@@ -8,53 +8,36 @@ import resolveAppId from '../resolveAppId';
 import scan from '../scan';
 import { ScanResults } from '../../report/scanResults';
 
-interface Scanner {
+export interface Scanner {
   scan(): Promise<ScanResults>;
 
   fetchFindingStatus(appId?: string, appMapDir?: string): Promise<FindingStatusListItem[]>;
 }
 
-export default function scanner(
+export default async function scanner(
   reportAllFindings: boolean,
   configuration: Configuration,
   files: string[]
-): Scanner {
-  return reportAllFindings
-    ? new StandaloneScanner(configuration, files)
-    : new ServerIntegratedScanner(configuration, files);
+): Promise<Scanner> {
+  if (reportAllFindings) {
+    return new StandaloneScanner(configuration, files);
+  } else {
+    await loadConfiguration();
+    return new ServerIntegratedScanner(configuration, files);
+  }
 }
 
 abstract class ScannerBase {
   constructor(public configuration: Configuration, public files: string[]) {}
 
   async scan(): Promise<ScanResults> {
-    await this.verifyServerConfiguration();
-
     const checks = await loadConfig(this.configuration);
     const { appMapMetadata, findings } = await scan(this.files, checks);
     return new ScanResults(this.configuration, appMapMetadata, findings, checks);
   }
-
-  protected abstract verifyServerConfiguration(): Promise<boolean>;
 }
 
 class ServerIntegratedScanner extends ScannerBase implements Scanner {
-  async verifyServerConfiguration(): Promise<boolean> {
-    return new Promise((resolve) => {
-      loadConfiguration()
-        .then(() => resolve(true))
-        .catch((err) => {
-          console.warn(`⚠️ Notice ⚠️`);
-          console.warn(`⚠️ AppMap Server configuration is not available.`);
-          console.warn(`⚠️ Detailed message: ${err.toString()}`);
-          console.warn(
-            `⚠️ Scanning will continue without fetching existing findings from the server.`
-          );
-          resolve(false);
-        });
-    });
-  }
-
   async fetchFindingStatus(
     appIdArg?: string,
     appMapDir?: string