rpc-client/dist/rpcQuery.js

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import { clearTimeout, setTimeout } from "timers";
import { pack, unpack } from "msgpackr";
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import { Buffer } from "buffer";
import { blake2b } from "libskynet";
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export default class RpcQuery {
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_network;
_query;
_promise;
_timeoutTimer;
_timeout = false;
_completed = false;
_responses = {};
_promiseResolve;
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constructor(network, query) {
this._network = network;
this._query = query;
this.init();
}
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get result() {
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return this._promise;
}
handeTimeout() {
this.resolve(false, true);
}
resolve(data, timeout = false) {
clearTimeout(this._timeoutTimer);
this._timeout = timeout;
this._completed = true;
// @ts-ignore
this._promiseResolve(data);
}
async init() {
this._promise =
this._promise ??
new Promise((resolve) => {
this._promiseResolve = resolve;
});
this._timeoutTimer =
this._timeoutTimer ??
setTimeout(this.handeTimeout.bind(this), this._network.queryTimeout * 1000);
await this._network.ready;
const promises = [];
// tslint:disable-next-line:forin
for (const relay of this._network.relays) {
promises.push(this.queryRelay(relay));
}
await Promise.allSettled(promises);
this.checkResponses();
}
async queryRelay(relay) {
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let socket;
try {
socket = this._network.dht.connect(Buffer.from(relay, "hex"));
if (isPromise(socket)) {
socket = await socket;
}
}
catch (e) {
return;
}
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return new Promise((resolve, reject) => {
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let timer;
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socket.on("data", (res) => {
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clearTimeout(timer);
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socket.end();
const response = unpack(res);
if (response && response.error) {
return reject(response);
}
this._responses[relay] = response;
resolve(null);
});
socket.on("error", (error) => reject({ error }));
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socket.write("rpc");
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socket.write(pack(this._query));
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timer = setTimeout(() => {
reject("timeout");
}, this._network.relayTimeout * 1000);
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});
}
checkResponses() {
const responseStore = this._responses;
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const responseStoreData = Object.values(responseStore);
const responseObjects = responseStoreData.reduce((output, item) => {
const hash = Buffer.from(blake2b(Buffer.from(JSON.stringify(item?.data)))).toString("hex");
output[hash] = item?.data;
return output;
}, {});
const responses = responseStoreData.reduce((output, item) => {
const hash = Buffer.from(blake2b(Buffer.from(JSON.stringify(item?.data)))).toString("hex");
output[hash] = output[hash] ?? 0;
output[hash]++;
return output;
}, {});
for (const responseHash in responses) {
if (responses[responseHash] / responseStoreData.length >=
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this._network.majorityThreshold) {
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// @ts-ignore
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const response = responseObjects[responseHash];
// @ts-ignore
if (null === response) {
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this.retry();
return;
}
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this.resolve(response);
break;
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}
}
}
retry() {
this._responses = {};
if (this._completed) {
return;
}
this.init();
}
}
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function isPromise(obj) {
return (!!obj &&
(typeof obj === "object" || typeof obj === "function") &&
typeof obj.then === "function");
}