feat: add code for getting coverage per req (#108)

Signed-off-by: Sarthak Shyngle <50234097+Sarthak160@users.noreply.github.com>

Author: Sarthak160

.vscode/settings.json

@@ -23,10 +23,13 @@
     "@types/express": "^4.17.21",
     "@types/node": "^20.11.16",
     "axios": "^1.6.7",
+    "cors": "^2.8.5",
+    "merge-descriptors": "^2.0.0",
     "tree-kill": "^1.2.2",
     "typescript": "^5.3.3"
   },
   "devDependencies": {
-    "@types/axios": "^0.14.0"
+    "@types/axios": "^0.14.0",
+    "@types/cors": "^2.8.17"
   }
 }

package-lock.json

@@ -0,0 +1,116 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+import { Request, Response, NextFunction } from "express";
+const fs = require('fs');
+const yaml = require('js-yaml');
+
+
+// middleware
+export default function middleware(
+
+): (req: Request, res: Response, next: NextFunction) => void {
+  // console.log("Inside middleware...");
+  return (req: Request, res: Response, next: NextFunction) => {
+    res.on("finish", () => {
+
+      afterMiddleware(req, res);
+    });
+    next();
+
+  };
+}
+
+
+export function afterMiddleware(req: Request, res: Response) {
+  let id = req.get("KEPLOY-TEST-ID");
+  if (!id) {
+    console.error("No test ID found in the request headers");
+    return;
+  }
+  let executedLinesByFile = GetCoverage();
+
+  let currentData = {
+    id: id,
+    executedLinesByFile: executedLinesByFile
+  };
+
+  const filePath = 'dedupData.yaml';
+
+  let existingData = [];
+
+  try {
+    const fileContent = fs.readFileSync(filePath, 'utf-8');
+    existingData = yaml.load(fileContent) || [];
+  } catch (error) {
+    // Handle the case where the file doesn't exist or is not valid YAML
+    // console.error("Error reading existing file:", error);
+  }
+
+
+
+  // Add or update the entry for the current id
+  existingData.push(currentData);
+
+  // Convert the array to YAML format
+  const yamlData = yaml.dump(existingData);
+
+  // Write the updated YAML data back to the file
+  fs.writeFileSync(filePath, yamlData, 'utf-8');
+
+  // Log to the console
+  // console.log("Executed lines by file:", executedLinesByFile);
+  // console.log("Data has been appended and logged to", filePath);
+}
+
+// isJsonValid checks whether o is a valid JSON or not
+
+let count = 0;
+const executedLinebyEachTest = new Array();
+function GetCoverage() {
+  // console.log("Inside GetCoverage");
+  count++;
+  let executedLinesByFile = {};
+  // iterate over global.__coverage__
+  // @ts-ignore
+  for (const filename in global.__coverage__) {
+    // console.log("FIlenamae", filename);
+    // while (1) {
+    // @ts-ignore
+    let coverageData = global.__coverage__[filename];
+    // console.log("Inside GetCoverage " + count);
+    // console.log(coverageData);
+
+
+    // for (const filePath of Object.keys(coverageData)) {
+    const executedLines = new Set();
+    const fileCoverage = coverageData;
+    const statementMap = fileCoverage.statementMap;
+    const hitCounts = fileCoverage.s;
+    if (count > 1) {
+      // iterate over hitcounts and subtract the previous hitcounts
+      // @ts-ignore
+      var prevHitCounts = executedLinebyEachTest[count - 2];
+
+      for (const statementId in hitCounts) {
+        hitCounts[statementId] = Math.abs(
+          hitCounts[statementId] - prevHitCounts[statementId]
+        );
+      }
+    }
+
+    for (const statementId in statementMap) {
+      if (hitCounts[statementId] > 0) {
+        const executedLine = statementMap[statementId].start.line;
+        executedLines.add(executedLine);
+      }
+    }
+    // @ts-ignore
+    executedLinesByFile[filename] = Array.from(executedLines).sort((a, b) => a - b);
+    // }
+    // @ts-ignore
+    executedLinebyEachTest.push({ ...hitCounts });
+
+    // console.log("Executed lines by file:", executedLinesByFile);
+    // extract s from the coverage data
+  }
+  return executedLinesByFile;
+}

package.json

@@ -0,0 +1,28 @@
+// @ts-ignore
+import Hook from "require-in-the-middle";
+import expressMiddleware from "./middleware";
+import bodyParser from "body-parser";
+import cors from "cors";
+import mixin from "merge-descriptors";
+
+
+// @ts-ignore
+Hook(["express"], function (exports) {
+  const expressApp = exports;
+  function keployWrappedExpress() {
+    const keployApp = expressApp();
+
+    keployApp.use(bodyParser.json());
+    keployApp.use(cors());
+    keployApp.use(expressMiddleware());
+    keployApp.appliedMiddleware = true;
+    return keployApp;
+  }
+
+  // copy the properties and methods of exported Function object into wrapped Funtion(keployWrappedExpress).
+  // In order to prevent "express._Method_ or express._Field_ is not declared" error.
+  mixin(keployWrappedExpress, expressApp, false);
+  exports = keployWrappedExpress;
+  return exports;
+});
+export {};