ethers.js/packages/providers/lib/fallback-provider.js

"use strict";
var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
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            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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var __generator = (this && this.__generator) || function (thisArg, body) {
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};
Object.defineProperty(exports, "__esModule", { value: true });
exports.FallbackProvider = void 0;
var abstract_provider_1 = require("@ethersproject/abstract-provider");
var bignumber_1 = require("@ethersproject/bignumber");
var bytes_1 = require("@ethersproject/bytes");
var properties_1 = require("@ethersproject/properties");
var random_1 = require("@ethersproject/random");
var web_1 = require("@ethersproject/web");
var base_provider_1 = require("./base-provider");
var formatter_1 = require("./formatter");
var logger_1 = require("@ethersproject/logger");
var _version_1 = require("./_version");
var logger = new logger_1.Logger(_version_1.version);
function now() { return (new Date()).getTime(); }
// Returns to network as long as all agree, or null if any is null.
// Throws an error if any two networks do not match.
function checkNetworks(networks) {
    var result = null;
    for (var i = 0; i < networks.length; i++) {
        var network = networks[i];
        // Null! We do not know our network; bail.
        if (network == null) {
            return null;
        }
        if (result) {
            // Make sure the network matches the previous networks
            if (!(result.name === network.name && result.chainId === network.chainId &&
                ((result.ensAddress === network.ensAddress) || (result.ensAddress == null && network.ensAddress == null)))) {
                logger.throwArgumentError("provider mismatch", "networks", networks);
            }
        }
        else {
            result = network;
        }
    }
    return result;
}
function median(values, maxDelta) {
    values = values.slice().sort();
    var middle = Math.floor(values.length / 2);
    // Odd length; take the middle
    if (values.length % 2) {
        return values[middle];
    }
    // Even length; take the average of the two middle
    var a = values[middle - 1], b = values[middle];
    if (maxDelta != null && Math.abs(a - b) > maxDelta) {
        return null;
    }
    return (a + b) / 2;
}
function serialize(value) {
    if (value === null) {
        return "null";
    }
    else if (typeof (value) === "number" || typeof (value) === "boolean") {
        return JSON.stringify(value);
    }
    else if (typeof (value) === "string") {
        return value;
    }
    else if (bignumber_1.BigNumber.isBigNumber(value)) {
        return value.toString();
    }
    else if (Array.isArray(value)) {
        return JSON.stringify(value.map(function (i) { return serialize(i); }));
    }
    else if (typeof (value) === "object") {
        var keys = Object.keys(value);
        keys.sort();
        return "{" + keys.map(function (key) {
            var v = value[key];
            if (typeof (v) === "function") {
                v = "[function]";
            }
            else {
                v = serialize(v);
            }
            return JSON.stringify(key) + ":" + v;
        }).join(",") + "}";
    }
    throw new Error("unknown value type: " + typeof (value));
}
// Next request ID to use for emitting debug info
var nextRid = 1;
;
function stall(duration) {
    var cancel = null;
    var timer = null;
    var promise = (new Promise(function (resolve) {
        cancel = function () {
            if (timer) {
                clearTimeout(timer);
                timer = null;
            }
            resolve();
        };
        timer = setTimeout(cancel, duration);
    }));
    var wait = function (func) {
        promise = promise.then(func);
        return promise;
    };
    function getPromise() {
        return promise;
    }
    return { cancel: cancel, getPromise: getPromise, wait: wait };
}
var ForwardErrors = [
    logger_1.Logger.errors.CALL_EXCEPTION,
    logger_1.Logger.errors.INSUFFICIENT_FUNDS,
    logger_1.Logger.errors.NONCE_EXPIRED,
    logger_1.Logger.errors.REPLACEMENT_UNDERPRICED,
    logger_1.Logger.errors.UNPREDICTABLE_GAS_LIMIT
];
var ForwardProperties = [
    "address",
    "args",
    "errorArgs",
    "errorSignature",
    "method",
    "transaction",
];
;
function exposeDebugConfig(config, now) {
    var result = {
        weight: config.weight
    };
    Object.defineProperty(result, "provider", { get: function () { return config.provider; } });
    if (config.start) {
        result.start = config.start;
    }
    if (now) {
        result.duration = (now - config.start);
    }
    if (config.done) {
        if (config.error) {
            result.error = config.error;
        }
        else {
            result.result = config.result || null;
        }
    }
    return result;
}
function normalizedTally(normalize, quorum) {
    return function (configs) {
        // Count the votes for each result
        var tally = {};
        configs.forEach(function (c) {
            var value = normalize(c.result);
            if (!tally[value]) {
                tally[value] = { count: 0, result: c.result };
            }
            tally[value].count++;
        });
        // Check for a quorum on any given result
        var keys = Object.keys(tally);
        for (var i = 0; i < keys.length; i++) {
            var check = tally[keys[i]];
            if (check.count >= quorum) {
                return check.result;
            }
        }
        // No quroum
        return undefined;
    };
}
function getProcessFunc(provider, method, params) {
    var normalize = serialize;
    switch (method) {
        case "getBlockNumber":
            // Return the median value, unless there is (median + 1) is also
            // present, in which case that is probably true and the median
            // is going to be stale soon. In the event of a malicious node,
            // the lie will be true soon enough.
            return function (configs) {
                var values = configs.map(function (c) { return c.result; });
                // Get the median block number
                var blockNumber = median(configs.map(function (c) { return c.result; }), 2);
                if (blockNumber == null) {
                    return undefined;
                }
                blockNumber = Math.ceil(blockNumber);
                // If the next block height is present, its prolly safe to use
                if (values.indexOf(blockNumber + 1) >= 0) {
                    blockNumber++;
                }
                // Don't ever roll back the blockNumber
                if (blockNumber >= provider._highestBlockNumber) {
                    provider._highestBlockNumber = blockNumber;
                }
                return provider._highestBlockNumber;
            };
        case "getGasPrice":
            // Return the middle (round index up) value, similar to median
            // but do not average even entries and choose the higher.
            // Malicious actors must compromise 50% of the nodes to lie.
            return function (configs) {
                var values = configs.map(function (c) { return c.result; });
                values.sort();
                return values[Math.floor(values.length / 2)];
            };
        case "getEtherPrice":
            // Returns the median price. Malicious actors must compromise at
            // least 50% of the nodes to lie (in a meaningful way).
            return function (configs) {
                return median(configs.map(function (c) { return c.result; }));
            };
        // No additional normalizing required; serialize is enough
        case "getBalance":
        case "getTransactionCount":
        case "getCode":
        case "getStorageAt":
        case "call":
        case "estimateGas":
        case "getLogs":
            break;
        // We drop the confirmations from transactions as it is approximate
        case "getTransaction":
        case "getTransactionReceipt":
            normalize = function (tx) {
                if (tx == null) {
                    return null;
                }
                tx = properties_1.shallowCopy(tx);
                tx.confirmations = -1;
                return serialize(tx);
            };
            break;
        // We drop the confirmations from transactions as it is approximate
        case "getBlock":
            // We drop the confirmations from transactions as it is approximate
            if (params.includeTransactions) {
                normalize = function (block) {
                    if (block == null) {
                        return null;
                    }
                    block = properties_1.shallowCopy(block);
                    block.transactions = block.transactions.map(function (tx) {
                        tx = properties_1.shallowCopy(tx);
                        tx.confirmations = -1;
                        return tx;
                    });
                    return serialize(block);
                };
            }
            else {
                normalize = function (block) {
                    if (block == null) {
                        return null;
                    }
                    return serialize(block);
                };
            }
            break;
        default:
            throw new Error("unknown method: " + method);
    }
    // Return the result if and only if the expected quorum is
    // satisfied and agreed upon for the final result.
    return normalizedTally(normalize, provider.quorum);
}
// If we are doing a blockTag query, we need to make sure the backend is
// caught up to the FallbackProvider, before sending a request to it.
function waitForSync(config, blockNumber) {
    return __awaiter(this, void 0, void 0, function () {
        var provider;
        return __generator(this, function (_a) {
            provider = (config.provider);
            if ((provider.blockNumber != null && provider.blockNumber >= blockNumber) || blockNumber === -1) {
                return [2 /*return*/, provider];
            }
            return [2 /*return*/, web_1.poll(function () {
                    return new Promise(function (resolve, reject) {
                        setTimeout(function () {
                            // We are synced
                            if (provider.blockNumber >= blockNumber) {
                                return resolve(provider);
                            }
                            // We're done; just quit
                            if (config.cancelled) {
                                return resolve(null);
                            }
                            // Try again, next block
                            return resolve(undefined);
                        }, 0);
                    });
                }, { oncePoll: provider })];
        });
    });
}
function getRunner(config, currentBlockNumber, method, params) {
    return __awaiter(this, void 0, void 0, function () {
        var provider, _a, filter;
        return __generator(this, function (_b) {
            switch (_b.label) {
                case 0:
                    provider = config.provider;
                    _a = method;
                    switch (_a) {
                        case "getBlockNumber": return [3 /*break*/, 1];
                        case "getGasPrice": return [3 /*break*/, 1];
                        case "getEtherPrice": return [3 /*break*/, 2];
                        case "getBalance": return [3 /*break*/, 3];
                        case "getTransactionCount": return [3 /*break*/, 3];
                        case "getCode": return [3 /*break*/, 3];
                        case "getStorageAt": return [3 /*break*/, 6];
                        case "getBlock": return [3 /*break*/, 9];
                        case "call": return [3 /*break*/, 12];
                        case "estimateGas": return [3 /*break*/, 12];
                        case "getTransaction": return [3 /*break*/, 15];
                        case "getTransactionReceipt": return [3 /*break*/, 15];
                        case "getLogs": return [3 /*break*/, 16];
                    }
                    return [3 /*break*/, 19];
                case 1: return [2 /*return*/, provider[method]()];
                case 2:
                    if (provider.getEtherPrice) {
                        return [2 /*return*/, provider.getEtherPrice()];
                    }
                    return [3 /*break*/, 19];
                case 3:
                    if (!(params.blockTag && bytes_1.isHexString(params.blockTag))) return [3 /*break*/, 5];
                    return [4 /*yield*/, waitForSync(config, currentBlockNumber)];
                case 4:
                    provider = _b.sent();
                    _b.label = 5;
                case 5: return [2 /*return*/, provider[method](params.address, params.blockTag || "latest")];
                case 6:
                    if (!(params.blockTag && bytes_1.isHexString(params.blockTag))) return [3 /*break*/, 8];
                    return [4 /*yield*/, waitForSync(config, currentBlockNumber)];
                case 7:
                    provider = _b.sent();
                    _b.label = 8;
                case 8: return [2 /*return*/, provider.getStorageAt(params.address, params.position, params.blockTag || "latest")];
                case 9:
                    if (!(params.blockTag && bytes_1.isHexString(params.blockTag))) return [3 /*break*/, 11];
                    return [4 /*yield*/, waitForSync(config, currentBlockNumber)];
                case 10:
                    provider = _b.sent();
                    _b.label = 11;
                case 11: return [2 /*return*/, provider[(params.includeTransactions ? "getBlockWithTransactions" : "getBlock")](params.blockTag || params.blockHash)];
                case 12:
                    if (!(params.blockTag && bytes_1.isHexString(params.blockTag))) return [3 /*break*/, 14];
                    return [4 /*yield*/, waitForSync(config, currentBlockNumber)];
                case 13:
                    provider = _b.sent();
                    _b.label = 14;
                case 14: return [2 /*return*/, provider[method](params.transaction)];
                case 15: return [2 /*return*/, provider[method](params.transactionHash)];
                case 16:
                    filter = params.filter;
                    if (!((filter.fromBlock && bytes_1.isHexString(filter.fromBlock)) || (filter.toBlock && bytes_1.isHexString(filter.toBlock)))) return [3 /*break*/, 18];
                    return [4 /*yield*/, waitForSync(config, currentBlockNumber)];
                case 17:
                    provider = _b.sent();
                    _b.label = 18;
                case 18: return [2 /*return*/, provider.getLogs(filter)];
                case 19: return [2 /*return*/, logger.throwError("unknown method error", logger_1.Logger.errors.UNKNOWN_ERROR, {
                        method: method,
                        params: params
                    })];
            }
        });
    });
}
var FallbackProvider = /** @class */ (function (_super) {
    __extends(FallbackProvider, _super);
    function FallbackProvider(providers, quorum) {
        var _newTarget = this.constructor;
        var _this = this;
        logger.checkNew(_newTarget, FallbackProvider);
        if (providers.length === 0) {
            logger.throwArgumentError("missing providers", "providers", providers);
        }
        var providerConfigs = providers.map(function (configOrProvider, index) {
            if (abstract_provider_1.Provider.isProvider(configOrProvider)) {
                var stallTimeout = formatter_1.isCommunityResource(configOrProvider) ? 2000 : 750;
                var priority = 1;
                return Object.freeze({ provider: configOrProvider, weight: 1, stallTimeout: stallTimeout, priority: priority });
            }
            var config = properties_1.shallowCopy(configOrProvider);
            if (config.priority == null) {
                config.priority = 1;
            }
            if (config.stallTimeout == null) {
                config.stallTimeout = formatter_1.isCommunityResource(configOrProvider) ? 2000 : 750;
            }
            if (config.weight == null) {
                config.weight = 1;
            }
            var weight = config.weight;
            if (weight % 1 || weight > 512 || weight < 1) {
                logger.throwArgumentError("invalid weight; must be integer in [1, 512]", "providers[" + index + "].weight", weight);
            }
            return Object.freeze(config);
        });
        var total = providerConfigs.reduce(function (accum, c) { return (accum + c.weight); }, 0);
        if (quorum == null) {
            quorum = total / 2;
        }
        else if (quorum > total) {
            logger.throwArgumentError("quorum will always fail; larger than total weight", "quorum", quorum);
        }
        // Are all providers' networks are known
        var networkOrReady = checkNetworks(providerConfigs.map(function (c) { return (c.provider).network; }));
        // Not all networks are known; we must stall
        if (networkOrReady == null) {
            networkOrReady = new Promise(function (resolve, reject) {
                setTimeout(function () {
                    _this.detectNetwork().then(resolve, reject);
                }, 0);
            });
        }
        _this = _super.call(this, networkOrReady) || this;
        // Preserve a copy, so we do not get mutated
        properties_1.defineReadOnly(_this, "providerConfigs", Object.freeze(providerConfigs));
        properties_1.defineReadOnly(_this, "quorum", quorum);
        _this._highestBlockNumber = -1;
        return _this;
    }
    FallbackProvider.prototype.detectNetwork = function () {
        return __awaiter(this, void 0, void 0, function () {
            var networks;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4 /*yield*/, Promise.all(this.providerConfigs.map(function (c) { return c.provider.getNetwork(); }))];
                    case 1:
                        networks = _a.sent();
                        return [2 /*return*/, checkNetworks(networks)];
                }
            });
        });
    };
    FallbackProvider.prototype.perform = function (method, params) {
        return __awaiter(this, void 0, void 0, function () {
            var results, i_1, result, processFunc, configs, currentBlockNumber, i, first, _loop_1, this_1, state_1;
            var _this = this;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (!(method === "sendTransaction")) return [3 /*break*/, 2];
                        return [4 /*yield*/, Promise.all(this.providerConfigs.map(function (c) {
                                return c.provider.sendTransaction(params.signedTransaction).then(function (result) {
                                    return result.hash;
                                }, function (error) {
                                    return error;
                                });
                            }))];
                    case 1:
                        results = _a.sent();
                        // Any success is good enough (other errors are likely "already seen" errors
                        for (i_1 = 0; i_1 < results.length; i_1++) {
                            result = results[i_1];
                            if (typeof (result) === "string") {
                                return [2 /*return*/, result];
                            }
                        }
                        // They were all an error; pick the first error
                        throw results[0];
                    case 2:
                        if (!(this._highestBlockNumber === -1 && method !== "getBlockNumber")) return [3 /*break*/, 4];
                        return [4 /*yield*/, this.getBlockNumber()];
                    case 3:
                        _a.sent();
                        _a.label = 4;
                    case 4:
                        processFunc = getProcessFunc(this, method, params);
                        configs = random_1.shuffled(this.providerConfigs.map(properties_1.shallowCopy));
                        configs.sort(function (a, b) { return (a.priority - b.priority); });
                        currentBlockNumber = this._highestBlockNumber;
                        i = 0;
                        first = true;
                        _loop_1 = function () {
                            var t0, inflightWeight, _loop_2, waiting, results, result, errors;
                            return __generator(this, function (_b) {
                                switch (_b.label) {
                                    case 0:
                                        t0 = now();
                                        inflightWeight = configs.filter(function (c) { return (c.runner && ((t0 - c.start) < c.stallTimeout)); })
                                            .reduce(function (accum, c) { return (accum + c.weight); }, 0);
                                        _loop_2 = function () {
                                            var config = configs[i++];
                                            var rid = nextRid++;
                                            config.start = now();
                                            config.staller = stall(config.stallTimeout);
                                            config.staller.wait(function () { config.staller = null; });
                                            config.runner = getRunner(config, currentBlockNumber, method, params).then(function (result) {
                                                config.done = true;
                                                config.result = result;
                                                if (_this.listenerCount("debug")) {
                                                    _this.emit("debug", {
                                                        action: "request",
                                                        rid: rid,
                                                        backend: exposeDebugConfig(config, now()),
                                                        request: { method: method, params: properties_1.deepCopy(params) },
                                                        provider: _this
                                                    });
                                                }
                                            }, function (error) {
                                                config.done = true;
                                                config.error = error;
                                                if (_this.listenerCount("debug")) {
                                                    _this.emit("debug", {
                                                        action: "request",
                                                        rid: rid,
                                                        backend: exposeDebugConfig(config, now()),
                                                        request: { method: method, params: properties_1.deepCopy(params) },
                                                        provider: _this
                                                    });
                                                }
                                            });
                                            if (this_1.listenerCount("debug")) {
                                                this_1.emit("debug", {
                                                    action: "request",
                                                    rid: rid,
                                                    backend: exposeDebugConfig(config, null),
                                                    request: { method: method, params: properties_1.deepCopy(params) },
                                                    provider: this_1
                                                });
                                            }
                                            inflightWeight += config.weight;
                                        };
                                        // Start running enough to meet quorum
                                        while (inflightWeight < this_1.quorum && i < configs.length) {
                                            _loop_2();
                                        }
                                        waiting = [];
                                        configs.forEach(function (c) {
                                            if (c.done || !c.runner) {
                                                return;
                                            }
                                            waiting.push(c.runner);
                                            if (c.staller) {
                                                waiting.push(c.staller.getPromise());
                                            }
                                        });
                                        if (!waiting.length) return [3 /*break*/, 2];
                                        return [4 /*yield*/, Promise.race(waiting)];
                                    case 1:
                                        _b.sent();
                                        _b.label = 2;
                                    case 2:
                                        results = configs.filter(function (c) { return (c.done && c.error == null); });
                                        if (!(results.length >= this_1.quorum)) return [3 /*break*/, 5];
                                        result = processFunc(results);
                                        if (result !== undefined) {
                                            // Shut down any stallers
                                            configs.forEach(function (c) {
                                                if (c.staller) {
                                                    c.staller.cancel();
                                                }
                                                c.cancelled = true;
                                            });
                                            return [2 /*return*/, { value: result }];
                                        }
                                        if (!!first) return [3 /*break*/, 4];
                                        return [4 /*yield*/, stall(100).getPromise()];
                                    case 3:
                                        _b.sent();
                                        _b.label = 4;
                                    case 4:
                                        first = false;
                                        _b.label = 5;
                                    case 5:
                                        errors = configs.reduce(function (accum, c) {
                                            if (!c.done || c.error == null) {
                                                return accum;
                                            }
                                            var code = (c.error).code;
                                            if (ForwardErrors.indexOf(code) >= 0) {
                                                if (!accum[code]) {
                                                    accum[code] = { error: c.error, weight: 0 };
                                                }
                                                accum[code].weight += c.weight;
                                            }
                                            return accum;
                                        }, ({}));
                                        Object.keys(errors).forEach(function (errorCode) {
                                            var tally = errors[errorCode];
                                            if (tally.weight < _this.quorum) {
                                                return;
                                            }
                                            // Shut down any stallers
                                            configs.forEach(function (c) {
                                                if (c.staller) {
                                                    c.staller.cancel();
                                                }
                                                c.cancelled = true;
                                            });
                                            var e = (tally.error);
                                            var props = {};
                                            ForwardProperties.forEach(function (name) {
                                                if (e[name] == null) {
                                                    return;
                                                }
                                                props[name] = e[name];
                                            });
                                            logger.throwError(e.reason || e.message, errorCode, props);
                                        });
                                        // All configs have run to completion; we will never get more data
                                        if (configs.filter(function (c) { return !c.done; }).length === 0) {
                                            return [2 /*return*/, "break"];
                                        }
                                        return [2 /*return*/];
                                }
                            });
                        };
                        this_1 = this;
                        _a.label = 5;
                    case 5:
                        if (!true) return [3 /*break*/, 7];
                        return [5 /*yield**/, _loop_1()];
                    case 6:
                        state_1 = _a.sent();
                        if (typeof state_1 === "object")
                            return [2 /*return*/, state_1.value];
                        if (state_1 === "break")
                            return [3 /*break*/, 7];
                        return [3 /*break*/, 5];
                    case 7:
                        // Shut down any stallers; shouldn't be any
                        configs.forEach(function (c) {
                            if (c.staller) {
                                c.staller.cancel();
                            }
                            c.cancelled = true;
                        });
                        return [2 /*return*/, logger.throwError("failed to meet quorum", logger_1.Logger.errors.SERVER_ERROR, {
                                method: method,
                                params: params,
                                //results: configs.map((c) => c.result),
                                //errors: configs.map((c) => c.error),
                                results: configs.map(function (c) { return exposeDebugConfig(c); }),
                                provider: this
                            })];
                }
            });
        });
    };
    return FallbackProvider;
}(base_provider_1.BaseProvider));
exports.FallbackProvider = FallbackProvider;
//# sourceMappingURL=fallback-provider.js.map