Add log for actual error when resolving package version (#4016)

* Add log for actual error when resolving package version

* .

common/changes/@azure-tools/extension/logs-extension-failed-to-resolve-version_2021-03-25-17-10.json

@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@azure-tools/extension",
+      "comment": "**Add** Logging when fail to fetch pacakge metadata",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@azure-tools/extension",
+  "email": "tiguerin@microsoft.com"
+}

packages/libs/extension/package.json

@@ -43,6 +43,7 @@
     "@azure-tools/async-io": "~3.0.0",
     "@azure-tools/eventing": "~3.0.0",
     "@azure-tools/tasks": "~3.0.0",
+    "@azure/logger": "^1.0.2",
     "command-exists": "~1.2.9",
     "npm-normalize-package-bin": "1.0.1",
     "npm-package-arg": "^8.1.0",

packages/libs/extension/src/logger.ts

@@ -0,0 +1,3 @@
+import { createClientLogger } from "@azure/logger";
+
+export const logger = createClientLogger("@azure-tools/extension");

packages/libs/extension/src/main.ts

@@ -30,6 +30,7 @@ import {
   MissingStartCommandException,
   UnsatisfiedSystemRequirementException,
 } from "./exceptions";
+import { logger } from "./logger";
 
 function quoteIfNecessary(text: string): string {
   if (text && text.indexOf(" ") > -1 && text.charAt(0) != '"') {
@@ -124,7 +125,8 @@ async function fetchPackageMetadata(spec: string): Promise<any> {
       "registry": process.env.autorest_registry || "https://registry.npmjs.org",
       "full-metadata": true,
     });
-  } catch (er) {
+  } catch (error) {
+    logger.error(`Error resolving package ${spec}`, error);
     throw new UnresolvedPackageException(spec);
   }
 }