BRS-291-15: Change to use npm instead of yarn, clean up layers, use node 20

.github/workflows/on-pr.yaml

@@ -20,9 +20,9 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
-          cache: "yarn"
-          cache-dependency-path: "arSam/yarn.lock"
-      - run: yarn install --silent --frozen-lockfile
+          cache: "npm"
+          cache-dependency-path: "arSam/package-lock.json"
+      - run: npm install
 
       # Setup AWS SAM
       - name: Setup AWS SAM

README.md

@@ -140,7 +140,7 @@ The `/opt` directory is only available at runtime within the SAM docker containe
     "^/opt/baseLayer": "<rootDir>/.aws-sam/build/BaseLayer/baseLayer",
     "^/opt/constantsLayer": "<rootDir>/.aws-sam/build/ConstantsLayer/constantsLayer",
     ...,
-    "^/opt/varianceLayer": "<rootDir>/.aws-sam/build/VarianceLayer/varianceLayer"
+    "^/opt/subAreaLayer": "<rootDir>/.aws-sam/build/subAreaLayer/subAreaLayer"
   ]
 }
 ```

arSam/handlers/activity/POST/index.js

@@ -1,7 +1,16 @@
 const { marshall, unmarshall } = require('@aws-sdk/util-dynamodb');
 const { DateTime } = require('luxon');
-const { dynamodb, runQuery, TABLE_NAME, getOne, FISCAL_YEAR_FINAL_MONTH, TIMEZONE, sendResponse, logger } = require('/opt/baseLayer');
-const { calculateVariance } = require('/opt/varianceLayer');
+const { 
+  dynamodb,
+  runQuery,
+  TABLE_NAME,
+  getOne,
+  FISCAL_YEAR_FINAL_MONTH,
+  TIMEZONE,
+  sendResponse,
+  logger,
+  calculateVariance
+} = require('/opt/baseLayer');
 const { EXPORT_VARIANCE_CONFIG } = require('/opt/constantsLayer');
 
 exports.handlePost = async (event, context) => {

arSam/handlers/variance/__tests__/variance.test.js

@@ -249,7 +249,7 @@ describe("Variance Test", () => {
   });
 
   test("Variance should trigger", async () => {
-    const { calculateVariance } = require("/opt/varianceLayer");
+    const { calculateVariance } = require("/opt/baseLayer");
     const res = calculateVariance([8, 8, 8], 10, 0.2);
     expect(res).toEqual({
       averageHistoricValue: 8,
@@ -260,7 +260,7 @@ describe("Variance Test", () => {
   });
 
   test("Variance should trigger 2", async () => {
-    const { calculateVariance } = require("/opt/varianceLayer");
+    const { calculateVariance } = require("/opt/baseLayer");
     const res = calculateVariance([8.5, 8.5, 8.5], 10.8, 0.2);
     expect(res).toEqual({
       averageHistoricValue: 8.5,
@@ -271,7 +271,7 @@ describe("Variance Test", () => {
   });
 
   test("Variance should trigger 3", async () => {
-    const { calculateVariance } = require("/opt/varianceLayer");
+    const { calculateVariance } = require("/opt/baseLayer");
     const res = calculateVariance([8.5, 8.5, 8.5], 0.8, 0.2);
     expect(res).toEqual({
       averageHistoricValue: 8.5,
@@ -282,7 +282,7 @@ describe("Variance Test", () => {
   });
 
   test("Variance should not trigger", async () => {
-    const { calculateVariance } = require("/opt/varianceLayer");
+    const { calculateVariance } = require("/opt/baseLayer");
     const res = calculateVariance([10.2, 10.2, 10.2], 10.2, 0.25);
     expect(res).toEqual({
       averageHistoricValue: 10.2,
@@ -293,7 +293,7 @@ describe("Variance Test", () => {
   });
 
   test("Variance should calculate variance with two years", async () => {
-    const { calculateVariance } = require("/opt/varianceLayer");
+    const { calculateVariance } = require("/opt/baseLayer");
     const res = calculateVariance([8, 8, null], 10, 0.2);
     expect(res).toEqual({
       averageHistoricValue: 8,

arSam/layers/baseLayer/Makefile

@@ -4,7 +4,7 @@ build-BaseLayer:
 					# remove makefile in artifacts directory
 					rm "$(ARTIFACTS_DIR)/Makefile"
 					# install dependencies in artifacts directory
-					cd nodejs && yarn cache clean && yarn --update-checksums && yarn install --ignore-scripts --frozen-lockfile --modules-folder "$(ARTIFACTS_DIR)/nodejs/node_modules"
+					cd nodejs && npm install --prefix "$(ARTIFACTS_DIR)"/nodejs
 					# symlink to node_modules folder for testing purposes
 					cd "$(ARTIFACTS_DIR)" && ln -s "$(ARTIFACTS_DIR)"/nodejs/node_modules node_modules
 					# remove package.json to avoid rebuilding when changes don't relate to dependencies

arSam/layers/baseLayer/baseLayer.js

@@ -1,4 +1,4 @@
-// Logger, ResponseUtil, and DynamoUtilLayer are all included in this baseLayer
+// Logger, ResponseUtils, VarianceUtils and DynamoUtils are all included in this baseLayer
 
 // Logger
 const { createLogger, format, transports } = require('winston');
@@ -22,7 +22,7 @@ const logger = createLogger({
   transports: [new transports.Console()]
 });
 
-// ResponseUtil
+// ResponseUtils
 const sendResponse = function (code, data, context) {
   const response = {
     statusCode: code,
@@ -37,7 +37,55 @@ const sendResponse = function (code, data, context) {
   return response;
 };
 
-// DynamoUtil
+// VarianceUtils
+function calculateVariance(
+  historicalValues,
+  currentValue,
+  variancePercentage
+) {
+  const filteredInputs = historicalValues.filter((val) => val !== null && !isNaN(val));
+
+  logger.info("=== Calculating variance ===");
+  // We might receive two past years instead of three
+  const numberOfYearsProvided = filteredInputs.length;
+  logger.debug("Number of years provided:", numberOfYearsProvided);
+
+  // Get the average value across provided years
+  const averageHistoricValue = filteredInputs.reduce((acc, val) => acc + val, 0) / filteredInputs.length;
+  logger.debug("Average historic value:", averageHistoricValue);
+
+  // Calculate the percentage change only if averageHistoricValue is not zero
+  let percentageChange;
+  if (averageHistoricValue !== 0) {
+    percentageChange = Math.round(((currentValue - averageHistoricValue) / averageHistoricValue) * 100) / 100;
+  } else {
+    // Set percentageChange to 0 or some other default value if averageHistoricValue is zero
+    percentageChange = 0;
+  }
+
+  const percentageChangeAbs = Math.abs(percentageChange);
+
+  const varianceMessage = `Variance triggered: ${percentageChangeAbs >= variancePercentage ? "+" : "-"}${Math.round(percentageChangeAbs * 100)}%`;
+
+  // Since percentage change is absolute, we can subtract from variance percentage
+  // If negative, variance is triggered
+  const varianceTriggered = variancePercentage - percentageChangeAbs <= 0 ? true : false;
+  logger.info("Variance Triggered:", varianceTriggered);
+  logger.info("Variance percentageChange:", percentageChange);
+  logger.info("Variance variancePercentage:", variancePercentage);
+
+  const res = {
+    varianceMessage: varianceMessage,
+    varianceTriggered: varianceTriggered,
+    percentageChange: +percentageChange,
+    averageHistoricValue: averageHistoricValue
+  };
+  logger.info("Variance return obj:", res);
+  logger.info("=== Variance calculation complete ===");
+  return res;
+}
+
+// DynamoUtils
 const { DynamoDB } = require('@aws-sdk/client-dynamodb');
 const { marshall, unmarshall } = require('@aws-sdk/util-dynamodb');
 
@@ -309,6 +357,7 @@ async function incrementAndGetNextSubAreaID() {
 module.exports = {
   logger,
   sendResponse,
+  calculateVariance,
   ACTIVE_STATUS,
   RESERVED_STATUS,
   EXPIRED_STATUS,

arSam/layers/constantsLayer/Makefile

@@ -3,9 +3,5 @@ build-ConstantsLayer:
 					cp -r * "$(ARTIFACTS_DIR)" 
 					# remove makefile in artifacts directory
 					rm "$(ARTIFACTS_DIR)/Makefile"
-					# install dependencies in artifacts directory
-					cd nodejs && yarn cache clean && yarn --update-checksums && yarn install --ignore-scripts --frozen-lockfile --modules-folder "$(ARTIFACTS_DIR)/nodejs/node_modules"
-					# symlink to node_modules folder for testing purposes
-					cd "$(ARTIFACTS_DIR)" && ln -s "$(ARTIFACTS_DIR)"/nodejs/node_modules node_modules
 					# remove package.json to avoid rebuilding when changes don't relate to dependencies
 					rm "$(ARTIFACTS_DIR)/nodejs/package.json"

arSam/layers/constantsLayer/nodejs/package.json

@@ -1,6 +1,6 @@
 {
-    "name": "ConstantsLayer",
-    "version": "0.0.1",
-    "author": "Digitalspace <contact@digitalspace.ca>",
-    "license": "MIT"
-  } 
+  "name": "ConstantsLayer",
+  "version": "0.0.1",
+  "author": "Digitalspace <contact@digitalspace.ca>",
+  "license": "MIT"
+} 

arSam/layers/formulaLayer/Makefile

@@ -4,7 +4,7 @@ build-FormulaLayer:
 					# remove makefile in artifacts directory
 					rm "$(ARTIFACTS_DIR)/Makefile"
 					# install dependencies in artifacts directory
-					cd nodejs && yarn cache clean && yarn --update-checksums && yarn install --ignore-scripts --frozen-lockfile --modules-folder "$(ARTIFACTS_DIR)/nodejs/node_modules"
+					cd nodejs && npm install --prefix "$(ARTIFACTS_DIR)"/nodejs
 					# symlink to node_modules folder for testing purposes
 					cd "$(ARTIFACTS_DIR)" && ln -s "$(ARTIFACTS_DIR)"/nodejs/node_modules node_modules
 					# remove package.json to avoid rebuilding when changes don't relate to dependencies

arSam/layers/functionsLayer/Makefile

@@ -4,7 +4,7 @@ build-FunctionsLayer:
 					# remove makefile in artifacts directory
 					rm "$(ARTIFACTS_DIR)/Makefile"
 					# install dependencies in artifacts directory
-					cd nodejs && yarn cache clean && yarn --update-checksums && yarn install --ignore-scripts --frozen-lockfile --modules-folder "$(ARTIFACTS_DIR)/nodejs/node_modules"
+					cd nodejs && npm install --prefix "$(ARTIFACTS_DIR)"/nodejs
 					# symlink to node_modules folder for testing purposes
 					cd "$(ARTIFACTS_DIR)" && ln -s "$(ARTIFACTS_DIR)"/nodejs/node_modules node_modules
 					# remove package.json to avoid rebuilding when changes don't relate to dependencies

arSam/layers/keycloakLayer/Makefile

@@ -4,7 +4,7 @@ build-KeycloakLayer:
 					# remove makefile in artifacts directory
 					rm "$(ARTIFACTS_DIR)/Makefile"
 					# install dependencies in artifacts directory
-					cd nodejs && yarn cache clean && yarn --update-checksums && yarn install --ignore-scripts --frozen-lockfile --modules-folder "$(ARTIFACTS_DIR)/nodejs/node_modules"
+					cd nodejs && npm install --prefix "$(ARTIFACTS_DIR)"/nodejs
 					# symlink to node_modules folder for testing purposes
 					cd "$(ARTIFACTS_DIR)" && ln -s "$(ARTIFACTS_DIR)"/nodejs/node_modules node_modules
 					# remove package.json to avoid rebuilding when changes don't relate to dependencies

arSam/layers/permissionLayer/Makefile

@@ -4,7 +4,7 @@ build-PermissionLayer:
 					# remove makefile in artifacts directory
 					rm "$(ARTIFACTS_DIR)/Makefile"
 					# install dependencies in artifacts directory
-					cd nodejs && yarn cache clean && yarn --update-checksums && yarn install --ignore-scripts --frozen-lockfile --modules-folder "$(ARTIFACTS_DIR)/nodejs/node_modules"
+					cd nodejs && npm install --prefix "$(ARTIFACTS_DIR)"/nodejs
 					# symlink to node_modules folder for testing purposes
 					cd "$(ARTIFACTS_DIR)" && ln -s "$(ARTIFACTS_DIR)"/nodejs/node_modules node_modules
 					# remove package.json to avoid rebuilding when changes don't relate to dependencies

arSam/layers/subAreaLayer/Makefile

@@ -4,7 +4,7 @@ build-SubAreaLayer:
 					# remove makefile in artifacts directory
 					rm "$(ARTIFACTS_DIR)/Makefile"
 					# install dependencies in artifacts directory
-					cd nodejs && yarn cache clean && yarn --update-checksums && yarn install --ignore-scripts --frozen-lockfile --modules-folder "$(ARTIFACTS_DIR)/nodejs/node_modules"
+					cd nodejs && npm install --prefix "$(ARTIFACTS_DIR)"/nodejs
 					# symlink to node_modules folder for testing purposes
 					cd "$(ARTIFACTS_DIR)" && ln -s "$(ARTIFACTS_DIR)"/nodejs/node_modules node_modules
 					# remove package.json to avoid rebuilding when changes don't relate to dependencies