Onboarding Project: Maxwill

.gitignore

@@ -1,3 +1,5 @@
 /node_modules
 app.js
 app.js.map
+apiManager.js
+apiManager.js.map

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "chrome",
+            "request": "launch",
+            "name": "Debug in Chrome",
+            "url": "http://localhost:2050/",
+            "webRoot": "${workspaceFolder}",
+            "sourceMapPathOverrides": {
+                "webpack:///./*": "${webRoot}/*"
+            }
+        }
+    ]
+}

.vscode/tasks.json

@@ -0,0 +1,15 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "typescript",
+			"tsconfig": "tsconfig.json",
+			"option": "watch",
+			"problemMatcher": [
+				"$tsc-watch"
+			],
+			"group": "build",
+			"label": "tsc: watch - tsconfig.json"
+		}
+	]
+}

apiManager.ts

@@ -0,0 +1,50 @@
+class ApiManager {
+
+	private mainUrl: string;
+
+	constructor(mainUrl: string) {
+		this.mainUrl = mainUrl;
+	}
+
+	private fetchJson(url: string): Promise<any> {
+		return fetch(url)
+			.then(res => {
+				if (res.ok) {
+					return res.json();
+				} else {
+					throw new Error(`HTTP error! Status: ${res.status}`);
+				}
+			})
+			.catch(error => {
+				throw new Error(`Fetch failed: ${error}`);
+			});
+	}
+
+	/** Retrieves records from the api */
+	getRecords(fromID: number, toID: number): Promise<string[][]> {
+		return this.fetchJson(`${this.mainUrl}/records?from=${fromID}&to=${toID}`);
+	}
+
+	/** Retrieves columns from the api */
+	getColumns(): Promise<string[]> {
+		return this.fetchJson(`${this.mainUrl}/columns`);
+	}
+
+	/** Retrieves the number of records there are */
+	getRecordCount(): Promise<number> {
+		return fetch(`${this.mainUrl}/recordCount`)
+		.then(res => {
+			if(res.ok) {
+				return res.text();
+			} else {
+				throw new Error(`HTTP error? Status: ${res.status}`);
+			}
+		})
+		.then (recordCount => {
+			return parseInt(recordCount);
+		})
+		.catch(error => {
+			throw error;
+		});
+	}
+}