Enable ignoring some paths for response time metrics

Author: ivanvs

examples/test-status-monitor/src/app.module.ts

@@ -8,9 +8,8 @@ import { HealtController } from './healtController';
 const statusMonitorConfig: StatusMonitorConfiguration = {
   pageTitle: 'Nest.js Monitoring Page',
   port: 3001,
-  path: 'status',
-  theme: 'default.css',
-  ignoreStartsWith: '',
+  path: '/status',
+  ignoreStartsWith: '/healt/alive',
   healthChecks: [
     {
       protocol: 'http',

src/config/status.monitor.configuration.ts

@@ -6,7 +6,6 @@ export interface StatusMonitorConfiguration {
   path: string;
   port: number;
   pageTitle: string;
-  theme: string;
   ignoreStartsWith: string;
   healthChecks: HealthCheckConfiguration[];
   spans: SpansConfiguration[];

src/status.monitor.controller.ts

@@ -14,8 +14,7 @@ export class StatusMonitorController {
 
   constructor(
     private readonly healtCheckService: HealthCheckService,
-    @Inject(STATUS_MONITOR_OPTIONS_PROVIDER)
-    private readonly config: StatusMonitorConfiguration,
+    @Inject(STATUS_MONITOR_OPTIONS_PROVIDER) config: StatusMonitorConfiguration,
   ) {
     const bodyClasses = Object.keys(config.chartVisibility)
       .reduce((accumulator, key) => {

src/status.monitor.middleware.ts

@@ -1,22 +1,38 @@
-import { Injectable, NestMiddleware, MiddlewareFunction } from '@nestjs/common';
+import {
+  Injectable,
+  NestMiddleware,
+  MiddlewareFunction,
+  Inject,
+} from '@nestjs/common';
 import * as onHeaders from 'on-headers';
 import { StatusMonitoringService } from './status.monitoring.service';
+import { STATUS_MONITOR_OPTIONS_PROVIDER } from './status.monitor.constants';
+import { StatusMonitorConfiguration } from './config/status.monitor.configuration';
 
 @Injectable()
 export class StatusMonitorMiddleware implements NestMiddleware {
   constructor(
     private readonly statusMonitoringService: StatusMonitoringService,
+    @Inject(STATUS_MONITOR_OPTIONS_PROVIDER)
+    private readonly config: StatusMonitorConfiguration,
   ) {}
 
   resolve(...args: any[]): MiddlewareFunction {
     return (req, res, next) => {
-      const startTime = process.hrtime();
-      onHeaders(res, () => {
-        this.statusMonitoringService.collectResponseTime(
-          res.statusCode,
-          startTime,
-        );
-      });
+      if (
+        this.config.ignoreStartsWith &&
+        !req.originalUrl.startsWith(this.config.ignoreStartsWith) &&
+        !req.originalUrl.startsWith(this.config.path)
+      ) {
+        const startTime = process.hrtime();
+        onHeaders(res, () => {
+          this.statusMonitoringService.collectResponseTime(
+            res.statusCode,
+            startTime,
+          );
+        });
+      }
+
       next();
     };
   }