feat: add logger service (#24)

Author: Hitesh-Kandpal

src/app/core/enums/log-level.enum.ts

@@ -0,0 +1,12 @@
+export enum LogLevel {
+  INFO = 'INFO',
+  WARN = 'WARN',
+  ERROR = 'ERROR',
+  FATAL = 'FATAL',
+}
+
+export enum Severity {
+  LOW = 'LOW',
+  MEDIUM = 'MEDIUM',
+  HIGH = 'HIGH',
+}

src/app/core/services/logger.service.ts

@@ -0,0 +1,210 @@
+import { Injectable } from '@angular/core';
+import { LogLevel, Severity } from '../enums/log-level.enum';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class LoggerService {
+  private sessionId: string;
+
+  constructor() {
+    this.sessionId = this.generateSessionId();
+  }
+
+  // eslint-disable-next-line class-methods-use-this
+  private generateSessionId(): string {
+    return `session-${new Date().getTime()}`;
+  }
+
+  private formatLog(
+    level: LogLevel,
+    severity: Severity,
+    tracebackId: string,
+    screenName: string,
+    source: string,
+    deviceInfo: string,
+    data: string,
+    message: string,
+    stackTrace = '',
+    timestamp = '',
+  ): string {
+    return JSON.stringify({
+      timestamp,
+      level,
+      tracebackId,
+      severity,
+      sessionId: this.sessionId,
+      screenName,
+      source,
+      deviceInfo,
+      data,
+      message,
+      stackTrace,
+    });
+  }
+
+  log(
+    level: LogLevel,
+    severity: Severity,
+    message: string,
+    stackTrace: string,
+    tracebackId: string = this.generateTracebackId(),
+    screenName: string = this.getScreenName(),
+    source: string = this.getSource(),
+    deviceInfo: string = this.getDeviceInfo(),
+    timestamp: string = new Date().toISOString(),
+  ): void {
+    const formattedLog = this.formatLog(
+      level,
+      severity,
+      tracebackId,
+      screenName,
+      source,
+      deviceInfo,
+      '',
+      message,
+      stackTrace,
+      timestamp,
+    );
+
+    // eslint-disable-next-line no-console
+    console.log(formattedLog);
+  }
+
+  // eslint-disable-next-line class-methods-use-this
+  private getScreenName(): string {
+    return window.location.pathname || 'unknown-screen';
+  }
+
+  // eslint-disable-next-line class-methods-use-this
+  private getSource(): string {
+    return 'app';
+  }
+
+  // eslint-disable-next-line class-methods-use-this
+  private getDeviceInfo(): string {
+    const { userAgent } = window.navigator;
+    let platform = '';
+
+    if (userAgent.match(/Win/)) {
+      platform = 'Windows';
+    } else if (userAgent.match(/Mac/)) {
+      platform = 'Mac';
+    } else if (userAgent.match(/Linux/)) {
+      platform = 'Linux';
+    } else if (userAgent.match(/Android/)) {
+      platform = 'Android';
+    } else if (userAgent.match(/iPhone|iPad|iPod/)) {
+      platform = 'iOS';
+    } else {
+      platform = 'Other';
+    }
+
+    const device = {
+      userAgent,
+      platform,
+      screenResolution: `${window.screen.width}x${window.screen.height}`,
+      viewport: `${window.innerWidth}x${window.innerHeight}`,
+      onlineStatus: navigator.onLine,
+    };
+
+    return JSON.stringify(device);
+  }
+
+  // eslint-disable-next-line class-methods-use-this
+  private generateTracebackId(): string {
+    return `${Date.now()}-${Math.random().toString(36).substring(2, 9)}`;
+  }
+
+  info(
+    severity: Severity,
+    tracebackId: string,
+    screenName: string,
+    source: string,
+    deviceInfo: string,
+    data: string,
+    message: string,
+    stackTrace?: string,
+  ): void {
+    this.log(
+      LogLevel.INFO,
+      severity || Severity.LOW,
+      tracebackId,
+      screenName,
+      source,
+      deviceInfo,
+      data,
+      message,
+      stackTrace,
+    );
+  }
+
+  warn(
+    severity: Severity,
+    tracebackId: string,
+    screenName: string,
+    source: string,
+    deviceInfo: string,
+    data: string,
+    message: string,
+    stackTrace?: string,
+  ): void {
+    this.log(
+      LogLevel.WARN,
+      severity || Severity.LOW,
+      tracebackId,
+      screenName,
+      source,
+      deviceInfo,
+      data,
+      message,
+      stackTrace,
+    );
+  }
+
+  error(
+    severity: Severity,
+    tracebackId: string,
+    screenName: string,
+    source: string,
+    deviceInfo: string,
+    data: string,
+    message: string,
+    stackTrace?: string,
+  ): void {
+    this.log(
+      LogLevel.ERROR,
+      severity || Severity.MEDIUM,
+      tracebackId,
+      screenName,
+      source,
+      deviceInfo,
+      data,
+      message,
+      stackTrace,
+    );
+  }
+
+  fatal(
+    severity: Severity,
+    tracebackId: string,
+    screenName: string,
+    source: string,
+    deviceInfo: string,
+    data: string,
+    message: string,
+    stackTrace?: string,
+  ): void {
+    this.log(
+      LogLevel.FATAL,
+      severity || Severity.HIGH,
+      tracebackId,
+      screenName,
+      source,
+      deviceInfo,
+      data,
+      message,
+      stackTrace,
+    );
+  }
+}