844 lines
33 KiB
JavaScript
844 lines
33 KiB
JavaScript
"use strict";
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import { ForkEvent, Provider } from "@ethersproject/abstract-provider";
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import { BigNumber } from "@ethersproject/bignumber";
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import { arrayify, hexDataLength, hexlify, hexValue, isHexString } from "@ethersproject/bytes";
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import { namehash } from "@ethersproject/hash";
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import { getNetwork } from "@ethersproject/networks";
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import { defineReadOnly, getStatic, resolveProperties } from "@ethersproject/properties";
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import { toUtf8String } from "@ethersproject/strings";
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import { poll } from "@ethersproject/web";
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import { Logger } from "@ethersproject/logger";
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import { version } from "./_version";
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const logger = new Logger(version);
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import { Formatter } from "./formatter";
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//////////////////////////////
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// Event Serializeing
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function checkTopic(topic) {
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if (topic == null) {
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return "null";
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}
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if (hexDataLength(topic) !== 32) {
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logger.throwArgumentError("invalid topic", "topic", topic);
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}
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return topic.toLowerCase();
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}
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function serializeTopics(topics) {
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// Remove trailing null AND-topics; they are redundant
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topics = topics.slice();
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while (topics[topics.length - 1] == null) {
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topics.pop();
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}
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return topics.map((topic) => {
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if (Array.isArray(topic)) {
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// Only track unique OR-topics
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let unique = {};
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topic.forEach((topic) => {
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unique[checkTopic(topic)] = true;
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});
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// The order of OR-topics does not matter
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let sorted = Object.keys(unique);
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sorted.sort();
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return sorted.join("|");
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}
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else {
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return checkTopic(topic);
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}
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}).join("&");
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}
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function deserializeTopics(data) {
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return data.split(/&/g).map((topic) => {
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return topic.split("|").map((topic) => {
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return ((topic === "null") ? null : topic);
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});
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});
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}
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function getEventTag(eventName) {
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if (typeof (eventName) === "string") {
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eventName = eventName.toLowerCase();
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if (hexDataLength(eventName) === 32) {
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return "tx:" + eventName;
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}
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if (eventName.indexOf(":") === -1) {
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return eventName;
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}
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}
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else if (Array.isArray(eventName)) {
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return "filter:*:" + serializeTopics(eventName);
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}
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else if (ForkEvent.isForkEvent(eventName)) {
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logger.warn("not implemented");
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throw new Error("not implemented");
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}
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else if (eventName && typeof (eventName) === "object") {
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return "filter:" + (eventName.address || "*") + ":" + serializeTopics(eventName.topics || []);
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}
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throw new Error("invalid event - " + eventName);
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}
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//////////////////////////////
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// Helper Object
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function getTime() {
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return (new Date()).getTime();
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}
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//////////////////////////////
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// Provider Object
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/**
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* EventType
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* - "block"
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* - "pending"
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* - "error"
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* - filter
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* - topics array
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* - transaction hash
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*/
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class Event {
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constructor(tag, listener, once) {
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defineReadOnly(this, "tag", tag);
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defineReadOnly(this, "listener", listener);
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defineReadOnly(this, "once", once);
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}
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pollable() {
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return (this.tag.indexOf(":") >= 0 || this.tag === "block" || this.tag === "pending");
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}
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}
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let defaultFormatter = null;
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let nextPollId = 1;
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export class BaseProvider extends Provider {
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constructor(network) {
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logger.checkNew(new.target, Provider);
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super();
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this.formatter = new.target.getFormatter();
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if (network instanceof Promise) {
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defineReadOnly(this, "ready", network.then((network) => {
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defineReadOnly(this, "_network", network);
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return network;
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}));
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// Squash any "unhandled promise" errors; that do not need to be handled
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this.ready.catch((error) => { });
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}
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else {
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let knownNetwork = getStatic((new.target), "getNetwork")(network);
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if (knownNetwork) {
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defineReadOnly(this, "_network", knownNetwork);
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defineReadOnly(this, "ready", Promise.resolve(this._network));
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}
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else {
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logger.throwArgumentError("invalid network", "network", network);
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}
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}
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this._lastBlockNumber = -2;
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// Events being listened to
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this._events = [];
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this._pollingInterval = 4000;
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this._emitted = { block: -2 };
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this._fastQueryDate = 0;
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}
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static getFormatter() {
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if (defaultFormatter == null) {
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defaultFormatter = new Formatter();
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}
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return defaultFormatter;
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}
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static getNetwork(network) {
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return getNetwork((network == null) ? "homestead" : network);
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}
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poll() {
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let pollId = nextPollId++;
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this.emit("willPoll", pollId);
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// Track all running promises, so we can trigger a post-poll once they are complete
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let runners = [];
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this.getBlockNumber().then((blockNumber) => {
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this._setFastBlockNumber(blockNumber);
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// If the block has not changed, meh.
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if (blockNumber === this._lastBlockNumber) {
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return;
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}
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// First polling cycle, trigger a "block" events
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if (this._emitted.block === -2) {
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this._emitted.block = blockNumber - 1;
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}
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// Notify all listener for each block that has passed
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for (let i = this._emitted.block + 1; i <= blockNumber; i++) {
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this.emit("block", i);
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}
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// The emitted block was updated, check for obsolete events
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if (this._emitted.block !== blockNumber) {
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this._emitted.block = blockNumber;
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Object.keys(this._emitted).forEach((key) => {
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// The block event does not expire
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if (key === "block") {
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return;
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}
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// The block we were at when we emitted this event
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let eventBlockNumber = this._emitted[key];
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// We cannot garbage collect pending transactions or blocks here
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// They should be garbage collected by the Provider when setting
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// "pending" events
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if (eventBlockNumber === "pending") {
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return;
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}
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// Evict any transaction hashes or block hashes over 12 blocks
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// old, since they should not return null anyways
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if (blockNumber - eventBlockNumber > 12) {
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delete this._emitted[key];
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}
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});
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}
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// First polling cycle
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if (this._lastBlockNumber === -2) {
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this._lastBlockNumber = blockNumber - 1;
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}
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// Find all transaction hashes we are waiting on
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this._events.forEach((event) => {
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let comps = event.tag.split(":");
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switch (comps[0]) {
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case "tx": {
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let hash = comps[1];
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let runner = this.getTransactionReceipt(hash).then((receipt) => {
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if (!receipt || receipt.blockNumber == null) {
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return null;
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}
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this._emitted["t:" + hash] = receipt.blockNumber;
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this.emit(hash, receipt);
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return null;
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}).catch((error) => { this.emit("error", error); });
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runners.push(runner);
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break;
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}
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case "filter": {
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let topics = deserializeTopics(comps[2]);
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let filter = {
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address: comps[1],
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fromBlock: this._lastBlockNumber + 1,
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toBlock: blockNumber,
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topics: topics
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};
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if (!filter.address) {
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delete filter.address;
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}
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let runner = this.getLogs(filter).then((logs) => {
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if (logs.length === 0) {
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return;
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}
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logs.forEach((log) => {
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this._emitted["b:" + log.blockHash] = log.blockNumber;
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this._emitted["t:" + log.transactionHash] = log.blockNumber;
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this.emit(filter, log);
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});
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return null;
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}).catch((error) => { this.emit("error", error); });
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runners.push(runner);
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break;
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}
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}
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});
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this._lastBlockNumber = blockNumber;
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return null;
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}).catch((error) => { });
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Promise.all(runners).then(() => {
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this.emit("didPoll", pollId);
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});
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}
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resetEventsBlock(blockNumber) {
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this._lastBlockNumber = blockNumber - 1;
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if (this.polling) {
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this.poll();
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}
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}
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get network() {
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return this._network;
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}
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getNetwork() {
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return this.ready;
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}
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get blockNumber() {
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return this._fastBlockNumber;
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}
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get polling() {
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return (this._poller != null);
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}
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set polling(value) {
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setTimeout(() => {
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if (value && !this._poller) {
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this._poller = setInterval(this.poll.bind(this), this.pollingInterval);
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}
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else if (!value && this._poller) {
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clearInterval(this._poller);
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this._poller = null;
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}
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}, 0);
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}
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get pollingInterval() {
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return this._pollingInterval;
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}
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set pollingInterval(value) {
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if (typeof (value) !== "number" || value <= 0 || parseInt(String(value)) != value) {
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throw new Error("invalid polling interval");
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}
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this._pollingInterval = value;
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if (this._poller) {
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clearInterval(this._poller);
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this._poller = setInterval(() => { this.poll(); }, this._pollingInterval);
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}
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}
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_getFastBlockNumber() {
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let now = getTime();
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// Stale block number, request a newer value
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if ((now - this._fastQueryDate) > 2 * this._pollingInterval) {
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this._fastQueryDate = now;
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this._fastBlockNumberPromise = this.getBlockNumber().then((blockNumber) => {
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if (this._fastBlockNumber == null || blockNumber > this._fastBlockNumber) {
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this._fastBlockNumber = blockNumber;
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}
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return this._fastBlockNumber;
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});
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}
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return this._fastBlockNumberPromise;
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}
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_setFastBlockNumber(blockNumber) {
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// Older block, maybe a stale request
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if (this._fastBlockNumber != null && blockNumber < this._fastBlockNumber) {
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return;
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}
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// Update the time we updated the blocknumber
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this._fastQueryDate = getTime();
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// Newer block number, use it
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if (this._fastBlockNumber == null || blockNumber > this._fastBlockNumber) {
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this._fastBlockNumber = blockNumber;
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this._fastBlockNumberPromise = Promise.resolve(blockNumber);
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}
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}
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// @TODO: Add .poller which must be an event emitter with a 'start', 'stop' and 'block' event;
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// this will be used once we move to the WebSocket or other alternatives to polling
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waitForTransaction(transactionHash, confirmations) {
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if (confirmations == null) {
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confirmations = 1;
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}
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if (confirmations === 0) {
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return this.getTransactionReceipt(transactionHash);
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}
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return new Promise((resolve) => {
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let handler = (receipt) => {
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if (receipt.confirmations < confirmations) {
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return;
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}
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this.removeListener(transactionHash, handler);
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resolve(receipt);
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};
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this.on(transactionHash, handler);
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});
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}
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_runPerform(method, params) {
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return this.ready.then(() => {
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// Execute all the functions now that we are "ready"
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Object.keys(params).forEach((key) => {
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params[key] = params[key]();
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});
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return resolveProperties(params).then((params) => {
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return this.perform(method, params);
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});
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});
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}
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getBlockNumber() {
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return this._runPerform("getBlockNumber", {}).then((result) => {
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let value = parseInt(result);
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if (value != result) {
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throw new Error("invalid response - getBlockNumber");
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}
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this._setFastBlockNumber(value);
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return value;
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});
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}
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getGasPrice() {
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return this._runPerform("getGasPrice", {}).then((result) => {
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return BigNumber.from(result);
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});
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}
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getBalance(addressOrName, blockTag) {
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return this._runPerform("getBalance", {
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address: () => this._getAddress(addressOrName),
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blockTag: () => this._getBlockTag(blockTag)
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}).then((result) => {
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return BigNumber.from(result);
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});
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}
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getTransactionCount(addressOrName, blockTag) {
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return this._runPerform("getTransactionCount", {
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address: () => this._getAddress(addressOrName),
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blockTag: () => this._getBlockTag(blockTag)
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}).then((result) => {
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return BigNumber.from(result).toNumber();
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});
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}
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getCode(addressOrName, blockTag) {
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return this._runPerform("getCode", {
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address: () => this._getAddress(addressOrName),
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blockTag: () => this._getBlockTag(blockTag)
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}).then((result) => {
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return hexlify(result);
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});
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}
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getStorageAt(addressOrName, position, blockTag) {
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return this._runPerform("getStorageAt", {
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address: () => this._getAddress(addressOrName),
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blockTag: () => this._getBlockTag(blockTag),
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position: () => Promise.resolve(position).then((p) => hexValue(p))
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}).then((result) => {
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return hexlify(result);
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});
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}
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// This should be called by any subclass wrapping a TransactionResponse
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_wrapTransaction(tx, hash) {
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if (hash != null && hexDataLength(hash) !== 32) {
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throw new Error("invalid response - sendTransaction");
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}
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let result = tx;
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// Check the hash we expect is the same as the hash the server reported
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if (hash != null && tx.hash !== hash) {
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logger.throwError("Transaction hash mismatch from Provider.sendTransaction.", Logger.errors.UNKNOWN_ERROR, { expectedHash: tx.hash, returnedHash: hash });
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}
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// @TODO: (confirmations? number, timeout? number)
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result.wait = (confirmations) => {
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// We know this transaction *must* exist (whether it gets mined is
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// another story), so setting an emitted value forces us to
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// wait even if the node returns null for the receipt
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if (confirmations !== 0) {
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this._emitted["t:" + tx.hash] = "pending";
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}
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return this.waitForTransaction(tx.hash, confirmations).then((receipt) => {
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if (receipt == null && confirmations === 0) {
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return null;
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}
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// No longer pending, allow the polling loop to garbage collect this
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this._emitted["t:" + tx.hash] = receipt.blockNumber;
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if (receipt.status === 0) {
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logger.throwError("transaction failed", Logger.errors.CALL_EXCEPTION, {
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transactionHash: tx.hash,
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transaction: tx,
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receipt: receipt
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});
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}
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return receipt;
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});
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};
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return result;
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}
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sendTransaction(signedTransaction) {
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return this._runPerform("sendTransaction", {
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signedTransaction: () => Promise.resolve(signedTransaction).then(t => hexlify(t))
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}).then((result) => {
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return this._wrapTransaction(this.formatter.transaction(signedTransaction), result);
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}, (error) => {
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error.transaction = this.formatter.transaction(signedTransaction);
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if (error.transaction.hash) {
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error.transactionHash = error.transaction.hash;
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}
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throw error;
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});
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}
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_getTransactionRequest(transaction) {
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return Promise.resolve(transaction).then((t) => {
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let tx = {};
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["from", "to"].forEach((key) => {
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if (t[key] == null) {
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return;
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}
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tx[key] = Promise.resolve(t[key]).then(a => (a ? this._getAddress(a) : null));
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});
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["data", "gasLimit", "gasPrice", "value"].forEach((key) => {
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if (t[key] == null) {
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return;
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}
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tx[key] = t[key];
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});
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return resolveProperties(tx).then((t) => this.formatter.transactionRequest(t));
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});
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}
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_getFilter(filter) {
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return Promise.resolve(filter).then((f) => {
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let filter = {};
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if (f.address != null) {
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filter.address = this._getAddress(f.address);
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}
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if (f.topics) {
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filter.topics = f.topics;
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}
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if (f.blockHash != null) {
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filter.blockHash = f.blockHash;
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}
|
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["fromBlock", "toBlock"].forEach((key) => {
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if (f[key] == null) {
|
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return;
|
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}
|
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filter[key] = this._getBlockTag(f[key]);
|
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});
|
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return resolveProperties(filter).then((f) => this.formatter.filter(f));
|
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});
|
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}
|
|
call(transaction, blockTag) {
|
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return this._runPerform("call", {
|
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transaction: () => this._getTransactionRequest(transaction),
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blockTag: () => this._getBlockTag(blockTag)
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}).then((result) => {
|
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return hexlify(result);
|
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});
|
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}
|
|
estimateGas(transaction) {
|
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return this._runPerform("estimateGas", {
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transaction: () => this._getTransactionRequest(transaction)
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}).then((result) => {
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return BigNumber.from(result);
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});
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}
|
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_getAddress(addressOrName) {
|
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return this.resolveName(addressOrName).then((address) => {
|
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if (address == null) {
|
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logger.throwError("ENS name not configured", Logger.errors.UNSUPPORTED_OPERATION, {
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operation: `resolveName(${JSON.stringify(addressOrName)})`
|
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});
|
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}
|
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return address;
|
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});
|
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}
|
|
_getBlock(blockHashOrBlockTag, includeTransactions) {
|
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return this.ready.then(() => {
|
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return this._getBlockTag(blockHashOrBlockTag).then((blockHashOrBlockTag) => {
|
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let params = {
|
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includeTransactions: !!includeTransactions
|
|
};
|
|
// Exactly one of blockHash or blockTag will be set
|
|
let blockHash = null;
|
|
let blockTag = null;
|
|
// If blockTag is a number (not "latest", etc), this is the block number
|
|
let blockNumber = -128;
|
|
if (isHexString(blockHashOrBlockTag, 32)) {
|
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params.blockHash = blockHashOrBlockTag;
|
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}
|
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else {
|
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try {
|
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params.blockTag = this.formatter.blockTag(blockHashOrBlockTag);
|
|
if (isHexString(params.blockTag)) {
|
|
blockNumber = parseInt(params.blockTag.substring(2), 16);
|
|
}
|
|
}
|
|
catch (error) {
|
|
logger.throwArgumentError("invalid block hash or block tag", "blockHashOrBlockTag", blockHashOrBlockTag);
|
|
}
|
|
}
|
|
return poll(() => {
|
|
return this.perform("getBlock", params).then((block) => {
|
|
// Block was not found
|
|
if (block == null) {
|
|
// For blockhashes, if we didn't say it existed, that blockhash may
|
|
// not exist. If we did see it though, perhaps from a log, we know
|
|
// it exists, and this node is just not caught up yet.
|
|
if (blockHash) {
|
|
if (this._emitted["b:" + blockHash] == null) {
|
|
return null;
|
|
}
|
|
}
|
|
// For block tags, if we are asking for a future block, we return null
|
|
if (blockTag) {
|
|
if (blockNumber > this._emitted.block) {
|
|
return null;
|
|
}
|
|
}
|
|
// Retry on the next block
|
|
return undefined;
|
|
}
|
|
// Add transactions
|
|
if (includeTransactions) {
|
|
return this.formatter.blockWithTransactions(block);
|
|
}
|
|
return this.formatter.block(block);
|
|
});
|
|
}, { onceBlock: this });
|
|
});
|
|
});
|
|
}
|
|
getBlock(blockHashOrBlockTag) {
|
|
return (this._getBlock(blockHashOrBlockTag, false));
|
|
}
|
|
getBlockWithTransactions(blockHashOrBlockTag) {
|
|
return (this._getBlock(blockHashOrBlockTag, true));
|
|
}
|
|
getTransaction(transactionHash) {
|
|
return this.ready.then(() => {
|
|
return resolveProperties({ transactionHash: transactionHash }).then(({ transactionHash }) => {
|
|
let params = { transactionHash: this.formatter.hash(transactionHash, true) };
|
|
return poll(() => {
|
|
return this.perform("getTransaction", params).then((result) => {
|
|
if (result == null) {
|
|
if (this._emitted["t:" + transactionHash] == null) {
|
|
return null;
|
|
}
|
|
return undefined;
|
|
}
|
|
let tx = this.formatter.transactionResponse(result);
|
|
if (tx.blockNumber == null) {
|
|
tx.confirmations = 0;
|
|
}
|
|
else if (tx.confirmations == null) {
|
|
return this._getFastBlockNumber().then((blockNumber) => {
|
|
// Add the confirmations using the fast block number (pessimistic)
|
|
let confirmations = (blockNumber - tx.blockNumber) + 1;
|
|
if (confirmations <= 0) {
|
|
confirmations = 1;
|
|
}
|
|
tx.confirmations = confirmations;
|
|
return this._wrapTransaction(tx);
|
|
});
|
|
}
|
|
return this._wrapTransaction(tx);
|
|
});
|
|
}, { onceBlock: this });
|
|
});
|
|
});
|
|
}
|
|
getTransactionReceipt(transactionHash) {
|
|
return this.ready.then(() => {
|
|
return resolveProperties({ transactionHash: transactionHash }).then(({ transactionHash }) => {
|
|
let params = { transactionHash: this.formatter.hash(transactionHash, true) };
|
|
return poll(() => {
|
|
return this.perform("getTransactionReceipt", params).then((result) => {
|
|
if (result == null) {
|
|
if (this._emitted["t:" + transactionHash] == null) {
|
|
return null;
|
|
}
|
|
return undefined;
|
|
}
|
|
// "geth-etc" returns receipts before they are ready
|
|
if (result.blockHash == null) {
|
|
return undefined;
|
|
}
|
|
let receipt = this.formatter.receipt(result);
|
|
if (receipt.blockNumber == null) {
|
|
receipt.confirmations = 0;
|
|
}
|
|
else if (receipt.confirmations == null) {
|
|
return this._getFastBlockNumber().then((blockNumber) => {
|
|
// Add the confirmations using the fast block number (pessimistic)
|
|
let confirmations = (blockNumber - receipt.blockNumber) + 1;
|
|
if (confirmations <= 0) {
|
|
confirmations = 1;
|
|
}
|
|
receipt.confirmations = confirmations;
|
|
return receipt;
|
|
});
|
|
}
|
|
return receipt;
|
|
});
|
|
}, { onceBlock: this });
|
|
});
|
|
});
|
|
}
|
|
getLogs(filter) {
|
|
return this._runPerform("getLogs", {
|
|
filter: () => this._getFilter(filter)
|
|
}).then((result) => {
|
|
return Formatter.arrayOf(this.formatter.filterLog.bind(this.formatter))(result);
|
|
});
|
|
}
|
|
getEtherPrice() {
|
|
return this._runPerform("getEtherPrice", {}).then((result) => {
|
|
return result;
|
|
});
|
|
}
|
|
_getBlockTag(blockTag) {
|
|
if (blockTag instanceof Promise) {
|
|
return blockTag.then((b) => this._getBlockTag(b));
|
|
}
|
|
if (typeof (blockTag) === "number" && blockTag < 0) {
|
|
if (blockTag % 1) {
|
|
logger.throwArgumentError("invalid BlockTag", "blockTag", blockTag);
|
|
}
|
|
return this._getFastBlockNumber().then((bn) => {
|
|
bn += blockTag;
|
|
if (bn < 0) {
|
|
bn = 0;
|
|
}
|
|
return this.formatter.blockTag(bn);
|
|
});
|
|
}
|
|
return Promise.resolve(this.formatter.blockTag(blockTag));
|
|
}
|
|
_getResolver(name) {
|
|
// Get the resolver from the blockchain
|
|
return this.getNetwork().then((network) => {
|
|
// No ENS...
|
|
if (!network.ensAddress) {
|
|
logger.throwError("network does support ENS", Logger.errors.UNSUPPORTED_OPERATION, { operation: "ENS", network: network.name });
|
|
}
|
|
// keccak256("resolver(bytes32)")
|
|
let data = "0x0178b8bf" + namehash(name).substring(2);
|
|
let transaction = { to: network.ensAddress, data: data };
|
|
return this.call(transaction).then((data) => {
|
|
return this.formatter.callAddress(data);
|
|
});
|
|
});
|
|
}
|
|
resolveName(name) {
|
|
// If it is a promise, resolve it then recurse
|
|
if (name instanceof Promise) {
|
|
return name.then((addressOrName) => this.resolveName(addressOrName));
|
|
}
|
|
// If it is already an address, nothing to resolve
|
|
try {
|
|
return Promise.resolve(this.formatter.address(name));
|
|
}
|
|
catch (error) { }
|
|
// Get the addr from the resovler
|
|
return this._getResolver(name).then((resolverAddress) => {
|
|
if (!resolverAddress) {
|
|
return null;
|
|
}
|
|
// keccak256("addr(bytes32)")
|
|
let data = "0x3b3b57de" + namehash(name).substring(2);
|
|
let transaction = { to: resolverAddress, data: data };
|
|
return this.call(transaction).then((data) => {
|
|
return this.formatter.callAddress(data);
|
|
});
|
|
});
|
|
}
|
|
lookupAddress(address) {
|
|
if (address instanceof Promise) {
|
|
return address.then((address) => this.lookupAddress(address));
|
|
}
|
|
address = this.formatter.address(address);
|
|
let name = address.substring(2) + ".addr.reverse";
|
|
return this._getResolver(name).then((resolverAddress) => {
|
|
if (!resolverAddress) {
|
|
return null;
|
|
}
|
|
// keccak("name(bytes32)")
|
|
let data = "0x691f3431" + namehash(name).substring(2);
|
|
return this.call({ to: resolverAddress, data: data }).then((data) => {
|
|
let bytes = arrayify(data);
|
|
// Strip off the dynamic string pointer (0x20)
|
|
if (bytes.length < 32 || !BigNumber.from(bytes.slice(0, 32)).eq(32)) {
|
|
return null;
|
|
}
|
|
bytes = bytes.slice(32);
|
|
if (bytes.length < 32) {
|
|
return null;
|
|
}
|
|
let length = BigNumber.from(bytes.slice(0, 32)).toNumber();
|
|
bytes = bytes.slice(32);
|
|
if (length > bytes.length) {
|
|
return null;
|
|
}
|
|
let name = toUtf8String(bytes.slice(0, length));
|
|
// Make sure the reverse record matches the foward record
|
|
return this.resolveName(name).then((addr) => {
|
|
if (addr != address) {
|
|
return null;
|
|
}
|
|
return name;
|
|
});
|
|
});
|
|
});
|
|
}
|
|
perform(method, params) {
|
|
return logger.throwError(method + " not implemented", Logger.errors.NOT_IMPLEMENTED, { operation: method });
|
|
}
|
|
_startPending() {
|
|
console.log("WARNING: this provider does not support pending events");
|
|
}
|
|
_stopPending() {
|
|
}
|
|
// Returns true if there are events that still require polling
|
|
_checkPolling() {
|
|
this.polling = (this._events.filter((e) => e.pollable()).length > 0);
|
|
}
|
|
_addEventListener(eventName, listener, once) {
|
|
this._events.push(new Event(getEventTag(eventName), listener, once));
|
|
if (eventName === "pending") {
|
|
this._startPending();
|
|
}
|
|
// Do we still now have any events that require polling?
|
|
this._checkPolling();
|
|
return this;
|
|
}
|
|
on(eventName, listener) {
|
|
return this._addEventListener(eventName, listener, false);
|
|
}
|
|
once(eventName, listener) {
|
|
return this._addEventListener(eventName, listener, true);
|
|
}
|
|
emit(eventName, ...args) {
|
|
let result = false;
|
|
let eventTag = getEventTag(eventName);
|
|
this._events = this._events.filter((event) => {
|
|
if (event.tag !== eventTag) {
|
|
return true;
|
|
}
|
|
setTimeout(() => {
|
|
event.listener.apply(this, args);
|
|
}, 0);
|
|
result = true;
|
|
return !(event.once);
|
|
});
|
|
// Do we still have any events that require polling? ("once" events remove themselves)
|
|
this._checkPolling();
|
|
return result;
|
|
}
|
|
listenerCount(eventName) {
|
|
if (!eventName) {
|
|
return this._events.length;
|
|
}
|
|
let eventTag = getEventTag(eventName);
|
|
return this._events.filter((event) => {
|
|
return (event.tag === eventTag);
|
|
}).length;
|
|
}
|
|
listeners(eventName) {
|
|
if (eventName == null) {
|
|
return this._events.map((event) => event.listener);
|
|
}
|
|
let eventTag = getEventTag(eventName);
|
|
return this._events
|
|
.filter((event) => (event.tag === eventTag))
|
|
.map((event) => event.listener);
|
|
}
|
|
off(eventName, listener) {
|
|
if (listener == null) {
|
|
return this.removeAllListeners(eventName);
|
|
}
|
|
let found = false;
|
|
let eventTag = getEventTag(eventName);
|
|
this._events = this._events.filter((event) => {
|
|
if (event.tag !== eventTag || event.listener != listener) {
|
|
return true;
|
|
}
|
|
if (found) {
|
|
return true;
|
|
}
|
|
found = true;
|
|
return false;
|
|
});
|
|
if (eventName === "pending" && this.listenerCount("pending") === 0) {
|
|
this._stopPending();
|
|
}
|
|
// Do we still have any events that require polling?
|
|
this._checkPolling();
|
|
return this;
|
|
}
|
|
removeAllListeners(eventName) {
|
|
if (eventName == null) {
|
|
this._events = [];
|
|
this._stopPending();
|
|
}
|
|
else {
|
|
let eventTag = getEventTag(eventName);
|
|
this._events = this._events.filter((event) => {
|
|
return (event.tag !== eventTag);
|
|
});
|
|
if (eventName === "pending") {
|
|
this._stopPending();
|
|
}
|
|
}
|
|
// Do we still have any events that require polling?
|
|
this._checkPolling();
|
|
return this;
|
|
}
|
|
}
|