ethers.js/packages/providers/lib.esm/base-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 { ForkEvent, Provider } from "@ethersproject/abstract-provider";
import { Base58 } from "@ethersproject/basex";
import { BigNumber } from "@ethersproject/bignumber";
import { arrayify, concat, hexConcat, hexDataLength, hexDataSlice, hexlify, hexValue, hexZeroPad, isHexString } from "@ethersproject/bytes";
import { HashZero } from "@ethersproject/constants";
import { namehash } from "@ethersproject/hash";
import { getNetwork } from "@ethersproject/networks";
import { defineReadOnly, getStatic, resolveProperties } from "@ethersproject/properties";
import { sha256 } from "@ethersproject/sha2";
import { toUtf8Bytes, toUtf8String } from "@ethersproject/strings";
import { poll } from "@ethersproject/web";
import bech32 from "bech32";
import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);
import { Formatter } from "./formatter";
//////////////////////////////
// Event Serializeing
function checkTopic(topic) {
    if (topic == null) {
        return "null";
    }
    if (hexDataLength(topic) !== 32) {
        logger.throwArgumentError("invalid topic", "topic", topic);
    }
    return topic.toLowerCase();
}
function serializeTopics(topics) {
    // Remove trailing null AND-topics; they are redundant
    topics = topics.slice();
    while (topics.length > 0 && topics[topics.length - 1] == null) {
        topics.pop();
    }
    return topics.map((topic) => {
        if (Array.isArray(topic)) {
            // Only track unique OR-topics
            const unique = {};
            topic.forEach((topic) => {
                unique[checkTopic(topic)] = true;
            });
            // The order of OR-topics does not matter
            const sorted = Object.keys(unique);
            sorted.sort();
            return sorted.join("|");
        }
        else {
            return checkTopic(topic);
        }
    }).join("&");
}
function deserializeTopics(data) {
    if (data === "") {
        return [];
    }
    return data.split(/&/g).map((topic) => {
        if (topic === "") {
            return [];
        }
        const comps = topic.split("|").map((topic) => {
            return ((topic === "null") ? null : topic);
        });
        return ((comps.length === 1) ? comps[0] : comps);
    });
}
function getEventTag(eventName) {
    if (typeof (eventName) === "string") {
        eventName = eventName.toLowerCase();
        if (hexDataLength(eventName) === 32) {
            return "tx:" + eventName;
        }
        if (eventName.indexOf(":") === -1) {
            return eventName;
        }
    }
    else if (Array.isArray(eventName)) {
        return "filter:*:" + serializeTopics(eventName);
    }
    else if (ForkEvent.isForkEvent(eventName)) {
        logger.warn("not implemented");
        throw new Error("not implemented");
    }
    else if (eventName && typeof (eventName) === "object") {
        return "filter:" + (eventName.address || "*") + ":" + serializeTopics(eventName.topics || []);
    }
    throw new Error("invalid event - " + eventName);
}
//////////////////////////////
// Helper Object
function getTime() {
    return (new Date()).getTime();
}
function stall(duration) {
    return new Promise((resolve) => {
        setTimeout(resolve, duration);
    });
}
//////////////////////////////
// Provider Object
/**
 *  EventType
 *   - "block"
 *   - "poll"
 *   - "didPoll"
 *   - "pending"
 *   - "error"
 *   - "network"
 *   - filter
 *   - topics array
 *   - transaction hash
 */
const PollableEvents = ["block", "network", "pending", "poll"];
export class Event {
    constructor(tag, listener, once) {
        defineReadOnly(this, "tag", tag);
        defineReadOnly(this, "listener", listener);
        defineReadOnly(this, "once", once);
    }
    get event() {
        switch (this.type) {
            case "tx":
                return this.hash;
            case "filter":
                return this.filter;
        }
        return this.tag;
    }
    get type() {
        return this.tag.split(":")[0];
    }
    get hash() {
        const comps = this.tag.split(":");
        if (comps[0] !== "tx") {
            return null;
        }
        return comps[1];
    }
    get filter() {
        const comps = this.tag.split(":");
        if (comps[0] !== "filter") {
            return null;
        }
        const address = comps[1];
        const topics = deserializeTopics(comps[2]);
        const filter = {};
        if (topics.length > 0) {
            filter.topics = topics;
        }
        if (address && address !== "*") {
            filter.address = address;
        }
        return filter;
    }
    pollable() {
        return (this.tag.indexOf(":") >= 0 || PollableEvents.indexOf(this.tag) >= 0);
    }
}
;
// https://github.com/satoshilabs/slips/blob/master/slip-0044.md
const coinInfos = {
    "0": { symbol: "btc", p2pkh: 0x00, p2sh: 0x05, prefix: "bc" },
    "2": { symbol: "ltc", p2pkh: 0x30, p2sh: 0x32, prefix: "ltc" },
    "3": { symbol: "doge", p2pkh: 0x1e, p2sh: 0x16 },
    "60": { symbol: "eth", ilk: "eth" },
    "61": { symbol: "etc", ilk: "eth" },
    "700": { symbol: "xdai", ilk: "eth" },
};
function bytes32ify(value) {
    return hexZeroPad(BigNumber.from(value).toHexString(), 32);
}
// Compute the Base58Check encoded data (checksum is first 4 bytes of sha256d)
function base58Encode(data) {
    return Base58.encode(concat([data, hexDataSlice(sha256(sha256(data)), 0, 4)]));
}
export class Resolver {
    constructor(provider, address, name) {
        defineReadOnly(this, "provider", provider);
        defineReadOnly(this, "name", name);
        defineReadOnly(this, "address", provider.formatter.address(address));
    }
    _fetchBytes(selector, parameters) {
        return __awaiter(this, void 0, void 0, function* () {
            // keccak256("addr(bytes32,uint256)")
            const transaction = {
                to: this.address,
                data: hexConcat([selector, namehash(this.name), (parameters || "0x")])
            };
            const result = yield this.provider.call(transaction);
            if (result === "0x") {
                return null;
            }
            const offset = BigNumber.from(hexDataSlice(result, 0, 32)).toNumber();
            const length = BigNumber.from(hexDataSlice(result, offset, offset + 32)).toNumber();
            return hexDataSlice(result, offset + 32, offset + 32 + length);
        });
    }
    _getAddress(coinType, hexBytes) {
        const coinInfo = coinInfos[String(coinType)];
        if (coinInfo == null) {
            logger.throwError(`unsupported coin type: ${coinType}`, Logger.errors.UNSUPPORTED_OPERATION, {
                operation: `getAddress(${coinType})`
            });
        }
        if (coinInfo.ilk === "eth") {
            return this.provider.formatter.address(hexBytes);
        }
        const bytes = arrayify(hexBytes);
        // P2PKH: OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
        if (coinInfo.p2pkh != null) {
            const p2pkh = hexBytes.match(/^0x76a9([0-9a-f][0-9a-f])([0-9a-f]*)88ac$/);
            if (p2pkh) {
                const length = parseInt(p2pkh[1], 16);
                if (p2pkh[2].length === length * 2 && length >= 1 && length <= 75) {
                    return base58Encode(concat([[coinInfo.p2pkh], ("0x" + p2pkh[2])]));
                }
            }
        }
        // P2SH: OP_HASH160 <scriptHash> OP_EQUAL
        if (coinInfo.p2sh != null) {
            const p2sh = hexBytes.match(/^0xa9([0-9a-f][0-9a-f])([0-9a-f]*)87$/);
            if (p2sh) {
                const length = parseInt(p2sh[1], 16);
                if (p2sh[2].length === length * 2 && length >= 1 && length <= 75) {
                    return base58Encode(concat([[coinInfo.p2sh], ("0x" + p2sh[2])]));
                }
            }
        }
        // Bech32
        if (coinInfo.prefix != null) {
            const length = bytes[1];
            // https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#witness-program
            let version = bytes[0];
            if (version === 0x00) {
                if (length !== 20 && length !== 32) {
                    version = -1;
                }
            }
            else {
                version = -1;
            }
            if (version >= 0 && bytes.length === 2 + length && length >= 1 && length <= 75) {
                const words = bech32.toWords(bytes.slice(2));
                words.unshift(version);
                return bech32.encode(coinInfo.prefix, words);
            }
        }
        return null;
    }
    getAddress(coinType) {
        return __awaiter(this, void 0, void 0, function* () {
            if (coinType == null) {
                coinType = 60;
            }
            // If Ethereum, use the standard `addr(bytes32)`
            if (coinType === 60) {
                // keccak256("addr(bytes32)")
                const transaction = {
                    to: this.address,
                    data: ("0x3b3b57de" + namehash(this.name).substring(2))
                };
                const hexBytes = yield this.provider.call(transaction);
                // No address
                if (hexBytes === "0x" || hexBytes === HashZero) {
                    return null;
                }
                return this.provider.formatter.callAddress(hexBytes);
            }
            // keccak256("addr(bytes32,uint256")
            const hexBytes = yield this._fetchBytes("0xf1cb7e06", bytes32ify(coinType));
            // No address
            if (hexBytes == null || hexBytes === "0x") {
                return null;
            }
            // Compute the address
            const address = this._getAddress(coinType, hexBytes);
            if (address == null) {
                logger.throwError(`invalid or unsupported coin data`, Logger.errors.UNSUPPORTED_OPERATION, {
                    operation: `getAddress(${coinType})`,
                    coinType: coinType,
                    data: hexBytes
                });
            }
            return address;
        });
    }
    getContentHash() {
        return __awaiter(this, void 0, void 0, function* () {
            // keccak256("contenthash()")
            const hexBytes = yield this._fetchBytes("0xbc1c58d1");
            // No contenthash
            if (hexBytes == null || hexBytes === "0x") {
                return null;
            }
            // IPFS (CID: 1, Type: DAG-PB)
            const ipfs = hexBytes.match(/^0xe3010170(([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f]*))$/);
            if (ipfs) {
                const length = parseInt(ipfs[3], 16);
                if (ipfs[4].length === length * 2) {
                    return "ipfs:/\/" + Base58.encode("0x" + ipfs[1]);
                }
            }
            // Swarm (CID: 1, Type: swarm-manifest; hash/length hard-coded to keccak256/32)
            const swarm = hexBytes.match(/^0xe40101fa011b20([0-9a-f]*)$/);
            if (swarm) {
                if (swarm[1].length === (32 * 2)) {
                    return "bzz:/\/" + swarm[1];
                }
            }
            return logger.throwError(`invalid or unsupported content hash data`, Logger.errors.UNSUPPORTED_OPERATION, {
                operation: "getContentHash()",
                data: hexBytes
            });
        });
    }
    getText(key) {
        return __awaiter(this, void 0, void 0, function* () {
            // The key encoded as parameter to fetchBytes
            let keyBytes = toUtf8Bytes(key);
            // The nodehash consumes the first slot, so the string pointer targets
            // offset 64, with the length at offset 64 and data starting at offset 96
            keyBytes = concat([bytes32ify(64), bytes32ify(keyBytes.length), keyBytes]);
            // Pad to word-size (32 bytes)
            if ((keyBytes.length % 32) !== 0) {
                keyBytes = concat([keyBytes, hexZeroPad("0x", 32 - (key.length % 32))]);
            }
            const hexBytes = yield this._fetchBytes("0x59d1d43c", hexlify(keyBytes));
            if (hexBytes == null || hexBytes === "0x") {
                return null;
            }
            return toUtf8String(hexBytes);
        });
    }
}
let defaultFormatter = null;
let nextPollId = 1;
export class BaseProvider extends Provider {
    /**
     *  ready
     *
     *  A Promise<Network> that resolves only once the provider is ready.
     *
     *  Sub-classes that call the super with a network without a chainId
     *  MUST set this. Standard named networks have a known chainId.
     *
     */
    constructor(network) {
        logger.checkNew(new.target, Provider);
        super();
        // Events being listened to
        this._events = [];
        this._emitted = { block: -2 };
        this.formatter = new.target.getFormatter();
        // If network is any, this Provider allows the underlying
        // network to change dynamically, and we auto-detect the
        // current network
        defineReadOnly(this, "anyNetwork", (network === "any"));
        if (this.anyNetwork) {
            network = this.detectNetwork();
        }
        if (network instanceof Promise) {
            this._networkPromise = network;
            // Squash any "unhandled promise" errors; that do not need to be handled
            network.catch((error) => { });
            // Trigger initial network setting (async)
            this._ready().catch((error) => { });
        }
        else {
            const knownNetwork = getStatic((new.target), "getNetwork")(network);
            if (knownNetwork) {
                defineReadOnly(this, "_network", knownNetwork);
                this.emit("network", knownNetwork, null);
            }
            else {
                logger.throwArgumentError("invalid network", "network", network);
            }
        }
        this._maxInternalBlockNumber = -1024;
        this._lastBlockNumber = -2;
        this._pollingInterval = 4000;
        this._fastQueryDate = 0;
    }
    _ready() {
        return __awaiter(this, void 0, void 0, function* () {
            if (this._network == null) {
                let network = null;
                if (this._networkPromise) {
                    try {
                        network = yield this._networkPromise;
                    }
                    catch (error) { }
                }
                // Try the Provider's network detection (this MUST throw if it cannot)
                if (network == null) {
                    network = yield this.detectNetwork();
                }
                // This should never happen; every Provider sub-class should have
                // suggested a network by here (or have thrown).
                if (!network) {
                    logger.throwError("no network detected", Logger.errors.UNKNOWN_ERROR, {});
                }
                // Possible this call stacked so do not call defineReadOnly again
                if (this._network == null) {
                    if (this.anyNetwork) {
                        this._network = network;
                    }
                    else {
                        defineReadOnly(this, "_network", network);
                    }
                    this.emit("network", network, null);
                }
            }
            return this._network;
        });
    }
    // This will always return the most recently established network.
    // For "any", this can change (a "network" event is emitted before
    // any change is refelcted); otherwise this cannot change
    get ready() {
        return poll(() => {
            return this._ready().then((network) => {
                return network;
            }, (error) => {
                // If the network isn't running yet, we will wait
                if (error.code === Logger.errors.NETWORK_ERROR && error.event === "noNetwork") {
                    return undefined;
                }
                throw error;
            });
        });
    }
    // @TODO: Remove this and just create a singleton formatter
    static getFormatter() {
        if (defaultFormatter == null) {
            defaultFormatter = new Formatter();
        }
        return defaultFormatter;
    }
    // @TODO: Remove this and just use getNetwork
    static getNetwork(network) {
        return getNetwork((network == null) ? "homestead" : network);
    }
    // Fetches the blockNumber, but will reuse any result that is less
    // than maxAge old or has been requested since the last request
    _getInternalBlockNumber(maxAge) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this._ready();
            const internalBlockNumber = this._internalBlockNumber;
            if (maxAge > 0 && internalBlockNumber) {
                try {
                    const result = yield internalBlockNumber;
                    if ((getTime() - result.respTime) <= maxAge) {
                        return result.blockNumber;
                    }
                }
                catch (error) {
                    // Don't null the dead (rejected) fetch, if it has already been updated
                    if (this._internalBlockNumber === internalBlockNumber) {
                        this._internalBlockNumber = null;
                    }
                    throw error;
                }
            }
            const reqTime = getTime();
            const checkInternalBlockNumber = resolveProperties({
                blockNumber: this.perform("getBlockNumber", {}),
                networkError: this.getNetwork().then((network) => (null), (error) => (error))
            }).then(({ blockNumber, networkError }) => {
                if (networkError) {
                    // Unremember this bad internal block number
                    if (this._internalBlockNumber === checkInternalBlockNumber) {
                        this._internalBlockNumber = null;
                    }
                    throw networkError;
                }
                const respTime = getTime();
                blockNumber = BigNumber.from(blockNumber).toNumber();
                if (blockNumber < this._maxInternalBlockNumber) {
                    blockNumber = this._maxInternalBlockNumber;
                }
                this._maxInternalBlockNumber = blockNumber;
                this._setFastBlockNumber(blockNumber); // @TODO: Still need this?
                return { blockNumber, reqTime, respTime };
            });
            this._internalBlockNumber = checkInternalBlockNumber;
            // Swallow unhandled exceptions; if needed they are handled else where
            checkInternalBlockNumber.catch((error) => {
                // Don't null the dead (rejected) fetch, if it has already been updated
                if (this._internalBlockNumber === checkInternalBlockNumber) {
                    this._internalBlockNumber = null;
                }
            });
            return (yield checkInternalBlockNumber).blockNumber;
        });
    }
    poll() {
        return __awaiter(this, void 0, void 0, function* () {
            const pollId = nextPollId++;
            // Track all running promises, so we can trigger a post-poll once they are complete
            const runners = [];
            let blockNumber = null;
            try {
                blockNumber = yield this._getInternalBlockNumber(100 + this.pollingInterval / 2);
            }
            catch (error) {
                this.emit("error", error);
                return;
            }
            this._setFastBlockNumber(blockNumber);
            // Emit a poll event after we have the latest (fast) block number
            this.emit("poll", pollId, blockNumber);
            // If the block has not changed, meh.
            if (blockNumber === this._lastBlockNumber) {
                this.emit("didPoll", pollId);
                return;
            }
            // First polling cycle, trigger a "block" events
            if (this._emitted.block === -2) {
                this._emitted.block = blockNumber - 1;
            }
            if (Math.abs((this._emitted.block) - blockNumber) > 1000) {
                logger.warn("network block skew detected; skipping block events");
                this.emit("error", logger.makeError("network block skew detected", Logger.errors.NETWORK_ERROR, {
                    blockNumber: blockNumber,
                    event: "blockSkew",
                    previousBlockNumber: this._emitted.block
                }));
                this.emit("block", blockNumber);
            }
            else {
                // Notify all listener for each block that has passed
                for (let i = this._emitted.block + 1; i <= blockNumber; i++) {
                    this.emit("block", i);
                }
            }
            // The emitted block was updated, check for obsolete events
            if (this._emitted.block !== blockNumber) {
                this._emitted.block = blockNumber;
                Object.keys(this._emitted).forEach((key) => {
                    // The block event does not expire
                    if (key === "block") {
                        return;
                    }
                    // The block we were at when we emitted this event
                    const eventBlockNumber = this._emitted[key];
                    // We cannot garbage collect pending transactions or blocks here
                    // They should be garbage collected by the Provider when setting
                    // "pending" events
                    if (eventBlockNumber === "pending") {
                        return;
                    }
                    // Evict any transaction hashes or block hashes over 12 blocks
                    // old, since they should not return null anyways
                    if (blockNumber - eventBlockNumber > 12) {
                        delete this._emitted[key];
                    }
                });
            }
            // First polling cycle
            if (this._lastBlockNumber === -2) {
                this._lastBlockNumber = blockNumber - 1;
            }
            // Find all transaction hashes we are waiting on
            this._events.forEach((event) => {
                switch (event.type) {
                    case "tx": {
                        const hash = event.hash;
                        let runner = this.getTransactionReceipt(hash).then((receipt) => {
                            if (!receipt || receipt.blockNumber == null) {
                                return null;
                            }
                            this._emitted["t:" + hash] = receipt.blockNumber;
                            this.emit(hash, receipt);
                            return null;
                        }).catch((error) => { this.emit("error", error); });
                        runners.push(runner);
                        break;
                    }
                    case "filter": {
                        const filter = event.filter;
                        filter.fromBlock = this._lastBlockNumber + 1;
                        filter.toBlock = blockNumber;
                        const runner = this.getLogs(filter).then((logs) => {
                            if (logs.length === 0) {
                                return;
                            }
                            logs.forEach((log) => {
                                this._emitted["b:" + log.blockHash] = log.blockNumber;
                                this._emitted["t:" + log.transactionHash] = log.blockNumber;
                                this.emit(filter, log);
                            });
                        }).catch((error) => { this.emit("error", error); });
                        runners.push(runner);
                        break;
                    }
                }
            });
            this._lastBlockNumber = blockNumber;
            // Once all events for this loop have been processed, emit "didPoll"
            Promise.all(runners).then(() => {
                this.emit("didPoll", pollId);
            }).catch((error) => { this.emit("error", error); });
            return;
        });
    }
    // Deprecated; do not use this
    resetEventsBlock(blockNumber) {
        this._lastBlockNumber = blockNumber - 1;
        if (this.polling) {
            this.poll();
        }
    }
    get network() {
        return this._network;
    }
    // This method should query the network if the underlying network
    // can change, such as when connected to a JSON-RPC backend
    detectNetwork() {
        return __awaiter(this, void 0, void 0, function* () {
            return logger.throwError("provider does not support network detection", Logger.errors.UNSUPPORTED_OPERATION, {
                operation: "provider.detectNetwork"
            });
        });
    }
    getNetwork() {
        return __awaiter(this, void 0, void 0, function* () {
            const network = yield this._ready();
            // Make sure we are still connected to the same network; this is
            // only an external call for backends which can have the underlying
            // network change spontaneously
            const currentNetwork = yield this.detectNetwork();
            if (network.chainId !== currentNetwork.chainId) {
                // We are allowing network changes, things can get complex fast;
                // make sure you know what you are doing if you use "any"
                if (this.anyNetwork) {
                    this._network = currentNetwork;
                    // Reset all internal block number guards and caches
                    this._lastBlockNumber = -2;
                    this._fastBlockNumber = null;
                    this._fastBlockNumberPromise = null;
                    this._fastQueryDate = 0;
                    this._emitted.block = -2;
                    this._maxInternalBlockNumber = -1024;
                    this._internalBlockNumber = null;
                    // The "network" event MUST happen before this method resolves
                    // so any events have a chance to unregister, so we stall an
                    // additional event loop before returning from /this/ call
                    this.emit("network", currentNetwork, network);
                    yield stall(0);
                    return this._network;
                }
                const error = logger.makeError("underlying network changed", Logger.errors.NETWORK_ERROR, {
                    event: "changed",
                    network: network,
                    detectedNetwork: currentNetwork
                });
                this.emit("error", error);
                throw error;
            }
            return network;
        });
    }
    get blockNumber() {
        this._getInternalBlockNumber(100 + this.pollingInterval / 2).then((blockNumber) => {
            this._setFastBlockNumber(blockNumber);
        }, (error) => { });
        return (this._fastBlockNumber != null) ? this._fastBlockNumber : -1;
    }
    get polling() {
        return (this._poller != null);
    }
    set polling(value) {
        if (value && !this._poller) {
            this._poller = setInterval(() => { this.poll(); }, this.pollingInterval);
            if (!this._bootstrapPoll) {
                this._bootstrapPoll = setTimeout(() => {
                    this.poll();
                    // We block additional polls until the polling interval
                    // is done, to prevent overwhelming the poll function
                    this._bootstrapPoll = setTimeout(() => {
                        // If polling was disabled, something may require a poke
                        // since starting the bootstrap poll and it was disabled
                        if (!this._poller) {
                            this.poll();
                        }
                        // Clear out the bootstrap so we can do another
                        this._bootstrapPoll = null;
                    }, this.pollingInterval);
                }, 0);
            }
        }
        else if (!value && this._poller) {
            clearInterval(this._poller);
            this._poller = null;
        }
    }
    get pollingInterval() {
        return this._pollingInterval;
    }
    set pollingInterval(value) {
        if (typeof (value) !== "number" || value <= 0 || parseInt(String(value)) != value) {
            throw new Error("invalid polling interval");
        }
        this._pollingInterval = value;
        if (this._poller) {
            clearInterval(this._poller);
            this._poller = setInterval(() => { this.poll(); }, this._pollingInterval);
        }
    }
    _getFastBlockNumber() {
        const now = getTime();
        // Stale block number, request a newer value
        if ((now - this._fastQueryDate) > 2 * this._pollingInterval) {
            this._fastQueryDate = now;
            this._fastBlockNumberPromise = this.getBlockNumber().then((blockNumber) => {
                if (this._fastBlockNumber == null || blockNumber > this._fastBlockNumber) {
                    this._fastBlockNumber = blockNumber;
                }
                return this._fastBlockNumber;
            });
        }
        return this._fastBlockNumberPromise;
    }
    _setFastBlockNumber(blockNumber) {
        // Older block, maybe a stale request
        if (this._fastBlockNumber != null && blockNumber < this._fastBlockNumber) {
            return;
        }
        // Update the time we updated the blocknumber
        this._fastQueryDate = getTime();
        // Newer block number, use  it
        if (this._fastBlockNumber == null || blockNumber > this._fastBlockNumber) {
            this._fastBlockNumber = blockNumber;
            this._fastBlockNumberPromise = Promise.resolve(blockNumber);
        }
    }
    waitForTransaction(transactionHash, confirmations, timeout) {
        return __awaiter(this, void 0, void 0, function* () {
            if (confirmations == null) {
                confirmations = 1;
            }
            const receipt = yield this.getTransactionReceipt(transactionHash);
            // Receipt is already good
            if ((receipt ? receipt.confirmations : 0) >= confirmations) {
                return receipt;
            }
            // Poll until the receipt is good...
            return new Promise((resolve, reject) => {
                let timer = null;
                let done = false;
                const handler = (receipt) => {
                    if (receipt.confirmations < confirmations) {
                        return;
                    }
                    if (timer) {
                        clearTimeout(timer);
                    }
                    if (done) {
                        return;
                    }
                    done = true;
                    this.removeListener(transactionHash, handler);
                    resolve(receipt);
                };
                this.on(transactionHash, handler);
                if (typeof (timeout) === "number" && timeout > 0) {
                    timer = setTimeout(() => {
                        if (done) {
                            return;
                        }
                        timer = null;
                        done = true;
                        this.removeListener(transactionHash, handler);
                        reject(logger.makeError("timeout exceeded", Logger.errors.TIMEOUT, { timeout: timeout }));
                    }, timeout);
                    if (timer.unref) {
                        timer.unref();
                    }
                }
            });
        });
    }
    getBlockNumber() {
        return __awaiter(this, void 0, void 0, function* () {
            return this._getInternalBlockNumber(0);
        });
    }
    getGasPrice() {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            return BigNumber.from(yield this.perform("getGasPrice", {}));
        });
    }
    getBalance(addressOrName, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            const params = yield resolveProperties({
                address: this._getAddress(addressOrName),
                blockTag: this._getBlockTag(blockTag)
            });
            return BigNumber.from(yield this.perform("getBalance", params));
        });
    }
    getTransactionCount(addressOrName, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            const params = yield resolveProperties({
                address: this._getAddress(addressOrName),
                blockTag: this._getBlockTag(blockTag)
            });
            return BigNumber.from(yield this.perform("getTransactionCount", params)).toNumber();
        });
    }
    getCode(addressOrName, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            const params = yield resolveProperties({
                address: this._getAddress(addressOrName),
                blockTag: this._getBlockTag(blockTag)
            });
            return hexlify(yield this.perform("getCode", params));
        });
    }
    getStorageAt(addressOrName, position, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            const params = yield resolveProperties({
                address: this._getAddress(addressOrName),
                blockTag: this._getBlockTag(blockTag),
                position: Promise.resolve(position).then((p) => hexValue(p))
            });
            return hexlify(yield this.perform("getStorageAt", params));
        });
    }
    // This should be called by any subclass wrapping a TransactionResponse
    _wrapTransaction(tx, hash) {
        if (hash != null && hexDataLength(hash) !== 32) {
            throw new Error("invalid response - sendTransaction");
        }
        const result = tx;
        // Check the hash we expect is the same as the hash the server reported
        if (hash != null && tx.hash !== hash) {
            logger.throwError("Transaction hash mismatch from Provider.sendTransaction.", Logger.errors.UNKNOWN_ERROR, { expectedHash: tx.hash, returnedHash: hash });
        }
        // @TODO: (confirmations? number, timeout? number)
        result.wait = (confirmations) => __awaiter(this, void 0, void 0, function* () {
            // We know this transaction *must* exist (whether it gets mined is
            // another story), so setting an emitted value forces us to
            // wait even if the node returns null for the receipt
            if (confirmations !== 0) {
                this._emitted["t:" + tx.hash] = "pending";
            }
            const receipt = yield this.waitForTransaction(tx.hash, confirmations);
            if (receipt == null && confirmations === 0) {
                return null;
            }
            // No longer pending, allow the polling loop to garbage collect this
            this._emitted["t:" + tx.hash] = receipt.blockNumber;
            if (receipt.status === 0) {
                logger.throwError("transaction failed", Logger.errors.CALL_EXCEPTION, {
                    transactionHash: tx.hash,
                    transaction: tx,
                    receipt: receipt
                });
            }
            return receipt;
        });
        return result;
    }
    sendTransaction(signedTransaction) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            const hexTx = yield Promise.resolve(signedTransaction).then(t => hexlify(t));
            const tx = this.formatter.transaction(signedTransaction);
            try {
                const hash = yield this.perform("sendTransaction", { signedTransaction: hexTx });
                return this._wrapTransaction(tx, hash);
            }
            catch (error) {
                error.transaction = tx;
                error.transactionHash = tx.hash;
                throw error;
            }
        });
    }
    _getTransactionRequest(transaction) {
        return __awaiter(this, void 0, void 0, function* () {
            const values = yield transaction;
            const tx = {};
            ["from", "to"].forEach((key) => {
                if (values[key] == null) {
                    return;
                }
                tx[key] = Promise.resolve(values[key]).then((v) => (v ? this._getAddress(v) : null));
            });
            ["gasLimit", "gasPrice", "value"].forEach((key) => {
                if (values[key] == null) {
                    return;
                }
                tx[key] = Promise.resolve(values[key]).then((v) => (v ? BigNumber.from(v) : null));
            });
            ["data"].forEach((key) => {
                if (values[key] == null) {
                    return;
                }
                tx[key] = Promise.resolve(values[key]).then((v) => (v ? hexlify(v) : null));
            });
            return this.formatter.transactionRequest(yield resolveProperties(tx));
        });
    }
    _getFilter(filter) {
        return __awaiter(this, void 0, void 0, function* () {
            filter = yield filter;
            const result = {};
            if (filter.address != null) {
                result.address = this._getAddress(filter.address);
            }
            ["blockHash", "topics"].forEach((key) => {
                if (filter[key] == null) {
                    return;
                }
                result[key] = filter[key];
            });
            ["fromBlock", "toBlock"].forEach((key) => {
                if (filter[key] == null) {
                    return;
                }
                result[key] = this._getBlockTag(filter[key]);
            });
            return this.formatter.filter(yield resolveProperties(result));
        });
    }
    call(transaction, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            const params = yield resolveProperties({
                transaction: this._getTransactionRequest(transaction),
                blockTag: this._getBlockTag(blockTag)
            });
            return hexlify(yield this.perform("call", params));
        });
    }
    estimateGas(transaction) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            const params = yield resolveProperties({
                transaction: this._getTransactionRequest(transaction)
            });
            return BigNumber.from(yield this.perform("estimateGas", params));
        });
    }
    _getAddress(addressOrName) {
        return __awaiter(this, void 0, void 0, function* () {
            const address = yield this.resolveName(addressOrName);
            if (address == null) {
                logger.throwError("ENS name not configured", Logger.errors.UNSUPPORTED_OPERATION, {
                    operation: `resolveName(${JSON.stringify(addressOrName)})`
                });
            }
            return address;
        });
    }
    _getBlock(blockHashOrBlockTag, includeTransactions) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            blockHashOrBlockTag = yield blockHashOrBlockTag;
            // If blockTag is a number (not "latest", etc), this is the block number
            let blockNumber = -128;
            const params = {
                includeTransactions: !!includeTransactions
            };
            if (isHexString(blockHashOrBlockTag, 32)) {
                params.blockHash = blockHashOrBlockTag;
            }
            else {
                try {
                    params.blockTag = this.formatter.blockTag(yield this._getBlockTag(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(() => __awaiter(this, void 0, void 0, function* () {
                const block = yield this.perform("getBlock", params);
                // 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 (params.blockHash != null) {
                        if (this._emitted["b:" + params.blockHash] == null) {
                            return null;
                        }
                    }
                    // For block tags, if we are asking for a future block, we return null
                    if (params.blockTag != null) {
                        if (blockNumber > this._emitted.block) {
                            return null;
                        }
                    }
                    // Retry on the next block
                    return undefined;
                }
                // Add transactions
                if (includeTransactions) {
                    let blockNumber = null;
                    for (let i = 0; i < block.transactions.length; i++) {
                        const tx = block.transactions[i];
                        if (tx.blockNumber == null) {
                            tx.confirmations = 0;
                        }
                        else if (tx.confirmations == null) {
                            if (blockNumber == null) {
                                blockNumber = yield this._getInternalBlockNumber(100 + 2 * this.pollingInterval);
                            }
                            // 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.formatter.blockWithTransactions(block);
                }
                return this.formatter.block(block);
            }), { oncePoll: this });
        });
    }
    getBlock(blockHashOrBlockTag) {
        return (this._getBlock(blockHashOrBlockTag, false));
    }
    getBlockWithTransactions(blockHashOrBlockTag) {
        return (this._getBlock(blockHashOrBlockTag, true));
    }
    getTransaction(transactionHash) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            transactionHash = yield transactionHash;
            const params = { transactionHash: this.formatter.hash(transactionHash, true) };
            return poll(() => __awaiter(this, void 0, void 0, function* () {
                const result = yield this.perform("getTransaction", params);
                if (result == null) {
                    if (this._emitted["t:" + transactionHash] == null) {
                        return null;
                    }
                    return undefined;
                }
                const tx = this.formatter.transactionResponse(result);
                if (tx.blockNumber == null) {
                    tx.confirmations = 0;
                }
                else if (tx.confirmations == null) {
                    const blockNumber = yield this._getInternalBlockNumber(100 + 2 * this.pollingInterval);
                    // 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);
            }), { oncePoll: this });
        });
    }
    getTransactionReceipt(transactionHash) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            transactionHash = yield transactionHash;
            const params = { transactionHash: this.formatter.hash(transactionHash, true) };
            return poll(() => __awaiter(this, void 0, void 0, function* () {
                const result = yield this.perform("getTransactionReceipt", params);
                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;
                }
                const receipt = this.formatter.receipt(result);
                if (receipt.blockNumber == null) {
                    receipt.confirmations = 0;
                }
                else if (receipt.confirmations == null) {
                    const blockNumber = yield this._getInternalBlockNumber(100 + 2 * this.pollingInterval);
                    // 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;
            }), { oncePoll: this });
        });
    }
    getLogs(filter) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            const params = yield resolveProperties({ filter: this._getFilter(filter) });
            const logs = yield this.perform("getLogs", params);
            logs.forEach((log) => {
                if (log.removed == null) {
                    log.removed = false;
                }
            });
            return Formatter.arrayOf(this.formatter.filterLog.bind(this.formatter))(logs);
        });
    }
    getEtherPrice() {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.getNetwork();
            return this.perform("getEtherPrice", {});
        });
    }
    _getBlockTag(blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            blockTag = yield blockTag;
            if (typeof (blockTag) === "number" && blockTag < 0) {
                if (blockTag % 1) {
                    logger.throwArgumentError("invalid BlockTag", "blockTag", blockTag);
                }
                let blockNumber = yield this._getInternalBlockNumber(100 + 2 * this.pollingInterval);
                blockNumber += blockTag;
                if (blockNumber < 0) {
                    blockNumber = 0;
                }
                return this.formatter.blockTag(blockNumber);
            }
            return this.formatter.blockTag(blockTag);
        });
    }
    getResolver(name) {
        return __awaiter(this, void 0, void 0, function* () {
            const address = yield this._getResolver(name);
            if (address == null) {
                return null;
            }
            return new Resolver(this, address, name);
        });
    }
    _getResolver(name) {
        return __awaiter(this, void 0, void 0, function* () {
            // Get the resolver from the blockchain
            const network = yield this.getNetwork();
            // No ENS...
            if (!network.ensAddress) {
                logger.throwError("network does not support ENS", Logger.errors.UNSUPPORTED_OPERATION, { operation: "ENS", network: network.name });
            }
            // keccak256("resolver(bytes32)")
            const transaction = {
                to: network.ensAddress,
                data: ("0x0178b8bf" + namehash(name).substring(2))
            };
            return this.formatter.callAddress(yield this.call(transaction));
        });
    }
    resolveName(name) {
        return __awaiter(this, void 0, void 0, function* () {
            name = yield name;
            // If it is already an address, nothing to resolve
            try {
                return Promise.resolve(this.formatter.address(name));
            }
            catch (error) {
                // If is is a hexstring, the address is bad (See #694)
                if (isHexString(name)) {
                    throw error;
                }
            }
            if (typeof (name) !== "string") {
                logger.throwArgumentError("invalid ENS name", "name", name);
            }
            // Get the addr from the resovler
            const resolver = yield this.getResolver(name);
            if (!resolver) {
                return null;
            }
            return yield resolver.getAddress();
        });
    }
    lookupAddress(address) {
        return __awaiter(this, void 0, void 0, function* () {
            address = yield address;
            address = this.formatter.address(address);
            const reverseName = address.substring(2).toLowerCase() + ".addr.reverse";
            const resolverAddress = yield this._getResolver(reverseName);
            if (!resolverAddress) {
                return null;
            }
            // keccak("name(bytes32)")
            let bytes = arrayify(yield this.call({
                to: resolverAddress,
                data: ("0x691f3431" + namehash(reverseName).substring(2))
            }));
            // 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);
            // Not a length-prefixed string
            if (bytes.length < 32) {
                return null;
            }
            // Get the length of the string (from the length-prefix)
            const length = BigNumber.from(bytes.slice(0, 32)).toNumber();
            bytes = bytes.slice(32);
            // Length longer than available data
            if (length > bytes.length) {
                return null;
            }
            const name = toUtf8String(bytes.slice(0, length));
            // Make sure the reverse record matches the foward record
            const addr = yield this.resolveName(name);
            if (addr != address) {
                return null;
            }
            return name;
        });
    }
    perform(method, params) {
        return logger.throwError(method + " not implemented", Logger.errors.NOT_IMPLEMENTED, { operation: method });
    }
    _startEvent(event) {
        this.polling = (this._events.filter((e) => e.pollable()).length > 0);
    }
    _stopEvent(event) {
        this.polling = (this._events.filter((e) => e.pollable()).length > 0);
    }
    _addEventListener(eventName, listener, once) {
        const event = new Event(getEventTag(eventName), listener, once);
        this._events.push(event);
        this._startEvent(event);
        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 stopped = [];
        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;
            if (event.once) {
                stopped.push(event);
                return false;
            }
            return true;
        });
        stopped.forEach((event) => { this._stopEvent(event); });
        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);
        }
        const stopped = [];
        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;
            stopped.push(event);
            return false;
        });
        stopped.forEach((event) => { this._stopEvent(event); });
        return this;
    }
    removeAllListeners(eventName) {
        let stopped = [];
        if (eventName == null) {
            stopped = this._events;
            this._events = [];
        }
        else {
            const eventTag = getEventTag(eventName);
            this._events = this._events.filter((event) => {
                if (event.tag !== eventTag) {
                    return true;
                }
                stopped.push(event);
                return false;
            });
        }
        stopped.forEach((event) => { this._stopEvent(event); });
        return this;
    }
}
//# sourceMappingURL=base-provider.js.map