import SimpleRpcQuery from "./simple.js"; import { Buffer } from "buffer"; import { isPromise } from "../util.js"; import { pack, unpack } from "msgpackr"; export default class StreamingRpcQuery extends SimpleRpcQuery { _options; _canceled = false; constructor(network, relay, query, options) { super(network, relay, query, options); this._options = options; } cancel() { this._canceled = true; } async queryRelay(relay) { let socket; let relayKey = relay; if (relay === "string") { relayKey = Buffer.from(relay, "hex"); } if (relay instanceof Buffer) { relayKey = relay; relay = relay.toString("hex"); } try { socket = this._network.dht.connect(relayKey); if (isPromise(socket)) { socket = await socket; } } catch (e) { return; } return new Promise((resolve, reject) => { const finish = () => { relay = relay; this._responses[relay] = {}; resolve(null); socket.end(); }; const listener = (res) => { relay = relay; this._timeoutCanceled = true; if (this._canceled) { socket.write(pack({ cancel: true })); socket.off("data", listener); finish(); return; } const response = unpack(res); if (response && response.error) { this._errors[relay] = response.error; return reject(null); } if (response?.data.done) { finish(); return; } this._options.streamHandler(response?.data.data); }; socket.on("data", listener); socket.on("error", (error) => { relay = relay; this._errors[relay] = error; reject({ error }); }); socket.write("rpc"); socket.write(pack(this._query)); }); } }