partysync/dist/chunk-5FZDUERS.js

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

// src/server/index.ts
import { Server } from "partyserver";
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]
        })
      );
    }
  }
};

export {
  SyncServer
};
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