app/services/server-config.service.ts

0001 import { Injectable } from '@angular/core';
0002 import { HttpClient } from '@angular/common/http';
0003 import * as jsoncParser from 'jsonc-parser';
0004 import {deepCopy} from "../utils/deep-copy";
0005 import {BehaviorSubject, Observable, catchError, map, of, firstValueFrom} from "rxjs";
0006
0007
0008 export interface ServerConfig {
0009   servedByPyrobird: boolean;
0010   apiAvailable: boolean;
0011   apiBaseUrl: string;
0012   logLevel: string;
0013 }
0014
0015 export const defaultFirebirdConfig: ServerConfig = {
0016   apiAvailable: false,
0017   apiBaseUrl: "",
0018   servedByPyrobird: false,
0019   logLevel: 'info'
0020 };
0021
0022
0023 @Injectable({
0024   providedIn: 'root'
0025 })
0026 export class ServerConfigService {
0027   private configUrl = 'assets/config.jsonc'; // URL to the JSONC config file
0028   private _config = deepCopy(defaultFirebirdConfig);
0029
0030   private triedLoading = false;
0031
0032   constructor(private http: HttpClient) {}
0033
0034   get config(): ServerConfig {
0035     if (!this.triedLoading) {
0036       this.triedLoading = true;
0037       console.error("[ServerConfigService] config() is called while config is not loaded")
0038     }
0039     return this._config;
0040   }
0041
0042   async loadConfig(): Promise<void> {
0043     try {
0044
0045       const jsoncData = await firstValueFrom(
0046         this.http.get(this.configUrl, { responseType: 'text' })
0047       );
0048       const loadedConfig = this.parseConfig(jsoncData);
0049
0050       // Merge loadedConfig over default config
0051       this._config = { ...defaultFirebirdConfig, ...loadedConfig };
0052       console.log("[ServerConfigService] Server config loaded file")
0053     } catch (error) {
0054       console.error(`Failed to load config: ${error}`);
0055       console.log(`[ServerConfigService] Default config will be used`);
0056     } finally {
0057       this.triedLoading = true;
0058     }
0059   }
0060
0061   private parseConfig(jsoncData: string): Partial<ServerConfig> {
0062     try {
0063       return jsoncParser.parse(jsoncData);
0064     } catch (parseError) {
0065       console.error('Error parsing JSONC data', parseError);
0066       return {};
0067     }
0068   }
0069
0070   /**
0071    * Sets the configuration - intended for use in unit tests only.
0072    * This method is safeguarded to be operational only in non-production environments.
0073    */
0074   public setUnitTestConfig(value: Partial<ServerConfig>) {
0075     this.triedLoading = true;
0076     this._config = {...defaultFirebirdConfig, ...value};
0077   }
0078 }