partysync/dist/server/index.js

Experimental library to synchronize state between a Durable Object and client. See [design discussion](https://github.com/cloudflare/partykit/issues/147).

import { Server } from "partyserver";

//#region src/server/index.ts
var SyncServer = class extends Server {
	static options = { hibernate: true };
	onAction(channel, action) {
		throw new Error("onAction not implemented, you should implement this in your server");
	}
	async onMessage(connection, message) {
		if (typeof message !== "string") {
			console.error("Received non-string message");
			return;
		}
		let json;
		try {
			json = JSON.parse(message);
		} catch (err) {
			connection.send(JSON.stringify({
				type: "exception",
				rpc: true,
				exception: [`Failed to parse message: ${err.message}`]
			}));
			return;
		}
		const channel = json.channel;
		if ("sync" in json && json.sync) {
			connection.send(JSON.stringify({
				sync: true,
				channel,
				payload: [...json.from ? this.ctx.storage.sql.exec(`SELECT * FROM ${channel} WHERE deleted_at IS NULL AND updated_at > ?`, json.from).raw() : this.ctx.storage.sql.exec(`SELECT * FROM ${channel} WHERE deleted_at IS NULL`).raw()]
			}));
			return;
		}
		const { id: messageId, action } = json;
		try {
			const result = await this.onAction(channel, action);
			connection.send(JSON.stringify({
				type: "success",
				rpc: true,
				channel,
				id: messageId,
				result
			}));
			this.broadcast(JSON.stringify({
				broadcast: true,
				type: "update",
				channel,
				payload: result
			}), [connection.id]);
		} catch (err) {
			connection.send(JSON.stringify({
				type: "error",
				rpc: true,
				channel,
				id: messageId,
				error: [err.message]
			}));
		}
	}
};

//#endregion
export { SyncServer };
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