create each request logger

src/RequestLog/request-log.middleware.ts

@@ -0,0 +1,43 @@
+import { NestMiddleware } from '@nestjs/common';
+import { NextFunction } from 'express';
+import { Request, Response } from 'express';
+import { appendFile } from 'fs';
+import { join } from 'path';
+
+export class RequestLogMiddleware implements NestMiddleware {
+  async use(req: Request, res: Response, next: NextFunction) {
+    const strIP = this.extractIp(req);
+    this.log(strIP + ' ' + req.method + ' ' + decodeURI(req.url));
+
+    next();
+  }
+
+  private extractIp(req: Request): string {
+    let strIP = 'unk_IP';
+    const strRemoteAddress = req.socket.remoteAddress;
+    if (strRemoteAddress != undefined) {
+      strIP = strRemoteAddress.substring(strRemoteAddress.lastIndexOf(':') + 1);
+    }
+
+    if (!strIP || strIP === '1') {
+      if (req.hostname === 'localhost') {
+        strIP = '127.0.0.1';
+      } else {
+        strIP = 'unk_IP';
+      }
+    }
+
+    return strIP;
+  }
+
+  private log(message: string) {
+    const strTime = new Date().toISOString();
+    const logFile = join(__dirname, process.env.LOG_FILE_REQUESTS);
+    appendFile(logFile, strTime + ' ' + message + '\n', function (err) {
+      if (err) {
+        console.log('error logging ' + message);
+        console.log(err);
+      }
+    });
+  }
+}