create get all predefined questions function

pte-api/package.json

@@ -7,10 +7,13 @@
         "@aws-sdk/client-dynamodb": "^3.188.0",
         "@aws-sdk/lib-dynamodb": "^3.188.0",
         "@types/aws-lambda": "^8.10.126",
+        "dotenv": "^16.3.1",
+        "pg": "^8.11.3",
         "ts-jest": "^29.1.1"
     },
     "devDependencies": {
         "@types/jest": "^29.5.10",
+        "@types/pg": "^8.10.9",
         "aws-sdk-client-mock": "^2.0.0",
         "jest": "^29.7.0",
         "typescript": "^5.3.2"

pte-api/src/handlers/predefined-question/get-predefined-questions.ts

@@ -0,0 +1,43 @@
+import { Client } from 'pg';
+import { APIGatewayProxyHandler } from 'aws-lambda';
+import dotenv from 'dotenv';
+
+// help get .env variable
+dotenv.config();
+
+export const getAllPredefinedQuestions: APIGatewayProxyHandler = async (event, context): Promise<any> => {
+    // create a DB client to interact with DB
+    const client = new Client({
+        host: process.env.DB_HOST,
+        port: parseInt(process.env.DB_PORT || '5432'),
+        user: process.env.DB_USER,
+        password: process.env.DB_PASSWORD,
+        database: process.env.DB_NAME
+    });
+
+    try {
+        // connect to DB
+        await client.connect();
+
+        // use query to get data from DB
+        const res = await client.query('SELECT * FROM predefined_question');
+
+        // disconnect from DB
+        await client.end();
+
+        // success: return data
+        return {
+            statusCode: 200,
+            body: JSON.stringify(res.rows)
+        };
+    } catch (err) {
+        // failure: log and return error message
+        if (err instanceof Error) {
+            console.error('Database error', err.stack);
+        }
+        return {
+            statusCode: 500,
+            body: 'Error connecting to the database'
+        };
+    }
+};

pte-api/template.yaml

@@ -33,6 +33,22 @@ Resources:
                 passthroughBehavior: "when_no_match"
                 httpMethod: "POST"
                 type: "aws_proxy"
+          /predefined-questions:
+            get:
+              produces:
+                - "application/json"
+              responses:
+                "200":
+                  description: "200 response"
+              x-amazon-apigateway-integration:
+                uri:
+                  Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${GetAllPredefinedQuestionsFunction.Arn}/invocations
+                responses:
+                  default:
+                    statusCode: "200"
+                passthroughBehavior: "when_no_match"
+                httpMethod: "POST"
+                type: "aws_proxy"
 
   HelloWorldFunction:
     Type: AWS::Serverless::Function 
@@ -48,6 +64,20 @@ Resources:
             Method: get
             RestApiId:
               Ref: HelloWorldApi
+  GetAllPredefinedQuestionsFunction:
+    Type: AWS::Serverless::Function
+    Properties:
+      CodeUri: ./
+      Handler: dist/handlers/predefined-question/get-predefined-questions.getAllPredefinedQuestions
+      Runtime: nodejs18.x
+      Events:
+        ApiEvent:
+          Type: Api
+          Properties:
+            Path: /predefined-questions
+            Method: get
+            RestApiId:
+              Ref: HelloWorldApi
 
   MyS3Bucket:
     Type: AWS::S3::Bucket