Added mongodb provider

backend-services/friend-service/src/Database/MongoConnectionProvider.ts

+import mongoose from "mongoose";
+
+/**
+ * Useful utilities for connection to a mongo database
+ */
+export class MongoConnectionProvider {
+
+  /**
+   * Mongo db name
+   */
+  public DatabaseName: string;
+
+  /**
+   * Mongo db path
+   */
+  public DatabasePath: string;
+
+  /**
+   * Mongo db port
+   */
+  public DatabasePort: number;
+
+  /**
+   * Mongo db connection
+   */
+  public Connection: mongoose.Connection = mongoose.connection;
+
+  constructor(name: string, path: string, port: number) {
+    this.DatabaseName = name;
+    this.DatabasePath = path;
+    this.DatabasePort = port;
+  }
+
+  /**
+   * Defines connection event functionality
+   * @param connectionUri 
+   */
+  private initializeConnectionEvents = (connectionUri: string) => {
+    this.Connection
+      .on('error', () => console.log(`Error connecting to database on: ${connectionUri}`))
+      .once('open', () => console.log(`Successful connection to database on: ${connectionUri}`))
+  }
+
+  /**
+   * Constructs the MongoDb connection URI
+   * @returns 
+   */
+  public ConnectionUri = (): string => `mongodb://${this.DatabasePath}:${this.DatabasePort}/${this.DatabaseName}`
+
+  /**
+   * Initalises a new mongo connection. 
+   */
+  public Connect = async (): Promise<void> => {
+    const connectionUri = this.ConnectionUri()
+    this.initializeConnectionEvents(connectionUri)
+    await mongoose.connect(connectionUri).catch((err) => {
+      console.log(err)
+    })
+  }
+}
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