From 073318df6fc1501793d4698b576626bf91fa14f1 Mon Sep 17 00:00:00 2001
From: Rohin Srivastava <rohinsri@amazon.com>
Date: Tue, 18 Apr 2023 12:31:43 +0530
Subject: [PATCH] feat: adding logger library for ask-developer use

---
 ask-sdk-core/lib/index.ts             |  1 +
 ask-sdk-core/lib/skill/CustomSkill.ts |  3 +-
 ask-sdk-core/lib/util/Logger.ts       | 67 +++++++++++++++++++++++++++
 3 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 ask-sdk-core/lib/util/Logger.ts

diff --git a/ask-sdk-core/lib/index.ts b/ask-sdk-core/lib/index.ts
index bed7d15e..689b0a84 100644
--- a/ask-sdk-core/lib/index.ts
+++ b/ask-sdk-core/lib/index.ts
@@ -34,6 +34,7 @@ export { CustomSkillBuilder } from './skill/factory/CustomSkillBuilder';
 export { CustomSkillFactory } from './skill/factory/CustomSkillFactory';
 export { SkillBuilders } from './skill/SkillBuilders';
 export { CustomSkillConfiguration as SkillConfiguration } from './skill/CustomSkillConfiguration';
+export { Logger, MetricsType } from './util/Logger';
 export {
     getViewportDpiGroup,
     getViewportOrientation,
diff --git a/ask-sdk-core/lib/skill/CustomSkill.ts b/ask-sdk-core/lib/skill/CustomSkill.ts
index a98d92c3..6e7645c3 100644
--- a/ask-sdk-core/lib/skill/CustomSkill.ts
+++ b/ask-sdk-core/lib/skill/CustomSkill.ts
@@ -30,6 +30,7 @@ import { PersistenceAdapter } from '../attributes/persistence/PersistenceAdapter
 import { HandlerInput } from '../dispatcher/request/handler/HandlerInput';
 import { ResponseFactory } from '../response/ResponseFactory';
 import { CustomSkillConfiguration } from './CustomSkillConfiguration';
+import { Logger } from '../util/Logger';
 import ServiceClientFactory = services.ServiceClientFactory;
 import ApiClient = services.ApiClient;
 
@@ -99,7 +100,7 @@ export class CustomSkill implements Skill<RequestEnvelope, ResponseEnvelope> {
         return {
             version : '1.0',
             response,
-            userAgent : UserAgentManager.getUserAgent(),
+            userAgent : UserAgentManager.getUserAgent() + Logger.getFeatures(),
             sessionAttributes : requestEnvelope.session ? input.attributesManager.getSessionAttributes() : undefined,
         };
     }
diff --git a/ask-sdk-core/lib/util/Logger.ts b/ask-sdk-core/lib/util/Logger.ts
new file mode 100644
index 00000000..fac54722
--- /dev/null
+++ b/ask-sdk-core/lib/util/Logger.ts
@@ -0,0 +1,67 @@
+/**
+ * Logger to log SDK interfaces and functions used by a skill
+*/
+
+export enum MetricsType{
+    InSDK = 1,
+    Component = 2
+}
+
+export abstract class Logger{
+    private constructor(){}
+
+    /**
+     * Set of features used by the skill from SDK
+     */
+    private static inSDKfeatures: Set<string> = new Set<string>();
+
+
+    /**
+     * Set of components used by a skill
+     */
+    private static componentList: Set<string> = new Set<string>();
+
+    /**
+     * Method to log the feature
+     */
+    public static log(featureName: string, type: MetricsType){
+        if(type==1){
+            Logger.inSDKfeatures.add(featureName);
+        }
+        else if(type==2){
+            Logger.componentList.add(featureName);
+        }
+    }
+
+    /**
+     * Method to get the components used by the skill
+     */
+    private static getComponentList(): string{
+        const componentList = Array.from(Logger.componentList).toString();
+        if(!componentList.length){
+            return '';
+        }
+        const log = ' components:['+componentList+']';
+        return log;
+    }
+
+    /**
+     * Method to get the SDK features used by the skill
+     */
+    private static getInSDKfeatures(): string{
+        const inSDKfeatures = Array.from(Logger.inSDKfeatures).toString();
+        if(!inSDKfeatures.length){
+            return '';
+        }
+        const log = ' sdk-dependencies:['+inSDKfeatures+']';
+        return log;
+    }
+
+    /**
+     * Method to get all the features used by the skill
+     */
+    public static getFeatures(): string{
+        const log = Logger.getInSDKfeatures() + Logger.getComponentList();
+        return log;
+    }
+}
\ No newline at end of file