Store and Load Config File automatically.

modules/wamo/src/wamo.carrierMapper.module.ts

@@ -8,11 +8,18 @@
 
 /* eslint-disable no-fallthrough */
 
+import { readFile } from "fs/promises";
 import { injectable } from "inversify";
+import { join } from "path";
 import {
   exportMethod,
   exportProperty
 } from "../../../lib/decorators/moduleDecorators";
+import {
+  createFile,
+  createPath,
+  exists
+} from "../../../lib/helpers/fileMethods";
 import { getNopeLogger } from "../../../lib/logger/getLogger";
 import { InjectableNopeBaseModule } from "../../../lib/module/BaseModule.injectable";
 import { NopeObservable } from "../../../lib/observables/nopeObservable";
@@ -53,6 +60,7 @@ export class WaMOCarrierMapper
   })
   public carriers = new NopeObservable<string[]>();
   protected _carriers = new Set<string>();
+  protected _file: string;
 
   /**
    * The Logger of the Module.
@@ -77,11 +85,60 @@ export class WaMOCarrierMapper
     };
 
     this._logger = getNopeLogger("wamo-carrier-mapper-" + this.identifier);
+
+    // Create a temporary File to store the Elements
+    const _path = join(process.cwd(), "temp");
+    await createPath(_path);
+
+    // Define the File Name. It is based on the identifier.
+    this._file = join(_path, this.identifier + "_file.json");
+
+    // Now Test if the File exists:
+    if (!(await exists(this._file))) {
+
+      this._logger.warn("No configuration File defined. Creating a new one under:",this._file);
+
+      this.carriers.setContent([]);
       this.mapping.setContent({});
       
+      // Create an Empty File.
+      await this.storeConfig();
+    }    
+
+    // We now try to load the configuration
+    const loadedConfig = JSON.parse(
+      await readFile(this._file, {
+        encoding: "utf-8"
+      })
+    );
+
+    // Load the Mapping and register the Carriers.    
+    for (const carrier in loadedConfig.carriers){
+      await this.registerCarrier(carrier);
+    }
+    // Add the Products to the Carrier.
+    for (const carrier in loadedConfig.mapping){
+      await this.addProductToCarrier(carrier, loadedConfig.mapping[carrier]);
+    }
+
     await super.init();
   }
 
+  /**
+   * Function, wich will 
+   *
+   * @memberof WaMOCarrierMapper
+   */
+  @exportMethod({
+    paramsHasNoCallback: true
+  })
+  public async storeConfig(){
+    await createFile(this._file, JSON.stringify({
+      carriers: this.carriers.getContent(),
+      mapping: this.mapping.getContent()
+    }));
+  }
+
   /**
    * Helper Function to Store new Carriers. If the carrier
    * is already present => Nothing happens
@@ -93,16 +150,33 @@ export class WaMOCarrierMapper
   @exportMethod({
     paramsHasNoCallback: true
   })
-  public async registerCarrier(carrier: string) {
+  public async registerCarrier(carrier: string): Promise<void> {
     // Add the Carrier if required:
     if (!this._carriers.has(carrier)) {
       this._carriers.add(carrier);
       this.carriers.setContent(Array.from(this._carriers));
 
       this._logger.info(`New Carrier with ID "${carrier}" has been detected`);
+
+      // Update the Config.
+      await this.storeConfig();
     }
   }
 
+  /**
+   * Function, to check if there exists a mapping for the carrier or not.
+   *
+   * @param {string} carrier
+   * @return {*}  {Promise<boolean>}
+   * @memberof WaMOCarrierMapper
+   */
+  @exportMethod({
+    paramsHasNoCallback: true
+  })
+  public async isProductLinkedToCarrier(carrier: string): Promise<boolean> {
+    return this.mapping.getContent()[carrier] !== undefined;
+  }
+
   @exportMethod({
     paramsHasNoCallback: true
   })
@@ -112,6 +186,9 @@ export class WaMOCarrierMapper
     // Delete all Carriers
     this._carriers.clear();
     this.carriers.setContent([]);
+
+    // Update the Config.
+    await this.storeConfig();
   }
 
   @exportMethod({
@@ -132,6 +209,9 @@ export class WaMOCarrierMapper
 
     // Add the Carrier
     await this.registerCarrier(carrier);
+
+    // Update the Config.
+    await this.storeConfig();
   }
 
   @exportMethod({
@@ -146,6 +226,9 @@ export class WaMOCarrierMapper
 
     // Add the Carrier
     await this.registerCarrier(carrier);
+
+    // Update the Config.
+    await this.storeConfig();
   }
 
   @exportMethod({