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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/@ethersproject/providers/lib.esm
Просмотр файла: websocket-provider.js
"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
import { BigNumber } from "@ethersproject/bignumber";
import { defineReadOnly } from "@ethersproject/properties";
import { JsonRpcProvider } from "./json-rpc-provider";
import { WebSocket } from "./ws";
import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);
/**
* Notes:
*
* This provider differs a bit from the polling providers. One main
* difference is how it handles consistency. The polling providers
* will stall responses to ensure a consistent state, while this
* WebSocket provider assumes the connected backend will manage this.
*
* For example, if a polling provider emits an event which indicates
* the event occurred in blockhash XXX, a call to fetch that block by
* its hash XXX, if not present will retry until it is present. This
* can occur when querying a pool of nodes that are mildly out of sync
* with each other.
*/
let NextId = 1;
// For more info about the Real-time Event API see:
// https://geth.ethereum.org/docs/rpc/pubsub
export class WebSocketProvider extends JsonRpcProvider {
constructor(url, network) {
// This will be added in the future; please open an issue to expedite
if (network === "any") {
logger.throwError("WebSocketProvider does not support 'any' network yet", Logger.errors.UNSUPPORTED_OPERATION, {
operation: "network:any"
});
}
if (typeof (url) === "string") {
super(url, network);
}
else {
super("_websocket", network);
}
this._pollingInterval = -1;
this._wsReady = false;
if (typeof (url) === "string") {
defineReadOnly(this, "_websocket", new WebSocket(this.connection.url));
}
else {
defineReadOnly(this, "_websocket", url);
}
defineReadOnly(this, "_requests", {});
defineReadOnly(this, "_subs", {});
defineReadOnly(this, "_subIds", {});
defineReadOnly(this, "_detectNetwork", super.detectNetwork());
// Stall sending requests until the socket is open...
this.websocket.onopen = () => {
this._wsReady = true;
Object.keys(this._requests).forEach((id) => {
this.websocket.send(this._requests[id].payload);
});
};
this.websocket.onmessage = (messageEvent) => {
const data = messageEvent.data;
const result = JSON.parse(data);
if (result.id != null) {
const id = String(result.id);
const request = this._requests[id];
delete this._requests[id];
if (result.result !== undefined) {
request.callback(null, result.result);
this.emit("debug", {
action: "response",
request: JSON.parse(request.payload),
response: result.result,
provider: this
});
}
else {
let error = null;
if (result.error) {
error = new Error(result.error.message || "unknown error");
defineReadOnly(error, "code", result.error.code || null);
defineReadOnly(error, "response", data);
}
else {
error = new Error("unknown error");
}
request.callback(error, undefined);
this.emit("debug", {
action: "response",
error: error,
request: JSON.parse(request.payload),
provider: this
});
}
}
else if (result.method === "eth_subscription") {
// Subscription...
const sub = this._subs[result.params.subscription];
if (sub) {
//this.emit.apply(this, );
sub.processFunc(result.params.result);
}
}
else {
console.warn("this should not happen");
}
};
// This Provider does not actually poll, but we want to trigger
// poll events for things that depend on them (like stalling for
// block and transaction lookups)
const fauxPoll = setInterval(() => {
this.emit("poll");
}, 1000);
if (fauxPoll.unref) {
fauxPoll.unref();
}
}
// Cannot narrow the type of _websocket, as that is not backwards compatible
// so we add a getter and let the WebSocket be a public API.
get websocket() { return this._websocket; }
detectNetwork() {
return this._detectNetwork;
}
get pollingInterval() {
return 0;
}
resetEventsBlock(blockNumber) {
logger.throwError("cannot reset events block on WebSocketProvider", Logger.errors.UNSUPPORTED_OPERATION, {
operation: "resetEventBlock"
});
}
set pollingInterval(value) {
logger.throwError("cannot set polling interval on WebSocketProvider", Logger.errors.UNSUPPORTED_OPERATION, {
operation: "setPollingInterval"
});
}
poll() {
return __awaiter(this, void 0, void 0, function* () {
return null;
});
}
set polling(value) {
if (!value) {
return;
}
logger.throwError("cannot set polling on WebSocketProvider", Logger.errors.UNSUPPORTED_OPERATION, {
operation: "setPolling"
});
}
send(method, params) {
const rid = NextId++;
return new Promise((resolve, reject) => {
function callback(error, result) {
if (error) {
return reject(error);
}
return resolve(result);
}
const payload = JSON.stringify({
method: method,
params: params,
id: rid,
jsonrpc: "2.0"
});
this.emit("debug", {
action: "request",
request: JSON.parse(payload),
provider: this
});
this._requests[String(rid)] = { callback, payload };
if (this._wsReady) {
this.websocket.send(payload);
}
});
}
static defaultUrl() {
return "ws:/\/localhost:8546";
}
_subscribe(tag, param, processFunc) {
return __awaiter(this, void 0, void 0, function* () {
let subIdPromise = this._subIds[tag];
if (subIdPromise == null) {
subIdPromise = Promise.all(param).then((param) => {
return this.send("eth_subscribe", param);
});
this._subIds[tag] = subIdPromise;
}
const subId = yield subIdPromise;
this._subs[subId] = { tag, processFunc };
});
}
_startEvent(event) {
switch (event.type) {
case "block":
this._subscribe("block", ["newHeads"], (result) => {
const blockNumber = BigNumber.from(result.number).toNumber();
this._emitted.block = blockNumber;
this.emit("block", blockNumber);
});
break;
case "pending":
this._subscribe("pending", ["newPendingTransactions"], (result) => {
this.emit("pending", result);
});
break;
case "filter":
this._subscribe(event.tag, ["logs", this._getFilter(event.filter)], (result) => {
if (result.removed == null) {
result.removed = false;
}
this.emit(event.filter, this.formatter.filterLog(result));
});
break;
case "tx": {
const emitReceipt = (event) => {
const hash = event.hash;
this.getTransactionReceipt(hash).then((receipt) => {
if (!receipt) {
return;
}
this.emit(hash, receipt);
});
};
// In case it is already mined
emitReceipt(event);
// To keep things simple, we start up a single newHeads subscription
// to keep an eye out for transactions we are watching for.
// Starting a subscription for an event (i.e. "tx") that is already
// running is (basically) a nop.
this._subscribe("tx", ["newHeads"], (result) => {
this._events.filter((e) => (e.type === "tx")).forEach(emitReceipt);
});
break;
}
// Nothing is needed
case "debug":
case "poll":
case "willPoll":
case "didPoll":
case "error":
break;
default:
console.log("unhandled:", event);
break;
}
}
_stopEvent(event) {
let tag = event.tag;
if (event.type === "tx") {
// There are remaining transaction event listeners
if (this._events.filter((e) => (e.type === "tx")).length) {
return;
}
tag = "tx";
}
else if (this.listenerCount(event.event)) {
// There are remaining event listeners
return;
}
const subId = this._subIds[tag];
if (!subId) {
return;
}
delete this._subIds[tag];
subId.then((subId) => {
if (!this._subs[subId]) {
return;
}
delete this._subs[subId];
this.send("eth_unsubscribe", [subId]);
});
}
destroy() {
return __awaiter(this, void 0, void 0, function* () {
// Wait until we have connected before trying to disconnect
if (this.websocket.readyState === WebSocket.CONNECTING) {
yield (new Promise((resolve) => {
this.websocket.onopen = function () {
resolve(true);
};
this.websocket.onerror = function () {
resolve(false);
};
}));
}
// Hangup
// See: https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent#Status_codes
this.websocket.close(1000);
});
}
}
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