Models: add simple model class

index.js

@@ -1,4 +1,5 @@
 const Router = require('./lib/router');
 const App = require('./lib/app');
+const Model = require('./lib/model');
 
-module.exports = { Router, App };
+module.exports = { Router, App, Model };

lib/model.js

@@ -0,0 +1,50 @@
+class Model {
+	static KV_BINDING = null;
+	static PREFIX = '';
+
+	static get_id(id) {
+		const separator = this.PREFIX ? '-' : '';
+		return `${this.PREFIX}${separator}${id}`;
+	}
+
+	static id(instance) {
+		return instance.id;
+	}
+
+	static get(id) {
+		return this.KV_BINDING.get(this.get_id(id)).then(data => {
+			if(data === null) {
+				return null;
+			}
+
+			const model_data = JSON.parse(data);
+			return this.fromJSON(model_data);
+		});
+	}
+
+	static bind_kv(binding) {
+		this.KV_BINDING = binding;
+	}
+
+	static fromJSON(data) {
+		return new this(data);
+	}
+
+	toJSON() {
+		return {...this};
+	}
+
+	save() {
+		const id = this.constructor.id(this);
+		if(!id) {
+			throw new Error('Cannot save model with no id');
+		}
+
+		return this.constructor.KV_BINDING.put(
+			this.constructor.get_id(id),
+			JSON.stringify(this)
+		).then(() => this);
+	}
+}
+
+module.exports = Model;

package.json

@@ -10,7 +10,8 @@
   "license": "MIT",
   "devDependencies": {
     "chai": "^4.3.6",
-    "mocha": "^9.2.1"
+    "mocha": "^9.2.1",
+    "sinon": "^13.0.1"
   },
   "publishConfig": {
     "access": "public"