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* [[link-etherscan]] provides a third-party service for connecting to
* various blockchains over a combination of JSON-RPC and custom API
* endpoints.
*
* **Supported Networks**
*
* - Ethereum Mainnet (``mainnet``)
* - Goerli Testnet (``goerli``)
* - Sepolia Testnet (``sepolia``)
* - Holesky Testnet (``holesky``)
* - Arbitrum (``arbitrum``)
* - Arbitrum Goerli Testnet (``arbitrum-goerli``)
* - Base (``base``)
* - Base Sepolia Testnet (``base-sepolia``)
* - BNB Smart Chain Mainnet (``bnb``)
* - BNB Smart Chain Testnet (``bnbt``)
* - Optimism (``optimism``)
* - Optimism Goerli Testnet (``optimism-goerli``)
* - Polygon (``matic``)
* - Polygon Mumbai Testnet (``matic-mumbai``)
* - Polygon Amoy Testnet (``matic-amoy``)
*
* @_subsection api/providers/thirdparty:Etherscan [providers-etherscan]
*/
import { AbiCoder } from "../abi/index.js";
import { Contract } from "../contract/index.js";
import { accessListify, Transaction } from "../transaction/index.js";
import {
defineProperties,
hexlify, toQuantity,
FetchRequest,
assert, assertArgument, isError,
// parseUnits,
toUtf8String
} from "../utils/index.js";
import { AbstractProvider } from "./abstract-provider.js";
import { Network } from "./network.js";
import { NetworkPlugin } from "./plugins-network.js";
import { showThrottleMessage } from "./community.js";
import { PerformActionRequest } from "./abstract-provider.js";
import type { Networkish } from "./network.js";
//import type { } from "./pagination";
import type { TransactionRequest } from "./provider.js";
const THROTTLE = 2000;
function isPromise<T = any>(value: any): value is Promise<T> {
return (value && typeof(value.then) === "function");
}
/**
* When subscribing to the ``"debug"`` event on an Etherscan-based
* provider, the events receive a **DebugEventEtherscanProvider**
* payload.
*
* @_docloc: api/providers/thirdparty:Etherscan
*/
export type DebugEventEtherscanProvider = {
action: "sendRequest",
id: number,
url: string,
payload: Record<string, any>
} | {
action: "receiveRequest",
id: number,
result: any
} | {
action: "receiveError",
id: number,
error: any
};
const EtherscanPluginId = "org.ethers.plugins.provider.Etherscan";
/**
* A Network can include an **EtherscanPlugin** to provide
* a custom base URL.
*
* @_docloc: api/providers/thirdparty:Etherscan
*/
export class EtherscanPlugin extends NetworkPlugin {
/**
* The Etherscan API base URL.
*/
readonly baseUrl!: string;
/**
* Creates a new **EtherscanProvider** which will use
* %%baseUrl%%.
*/
constructor(baseUrl: string) {
super(EtherscanPluginId);
defineProperties<EtherscanPlugin>(this, { baseUrl });
}
clone(): EtherscanPlugin {
return new EtherscanPlugin(this.baseUrl);
}
}
const skipKeys = [ "enableCcipRead" ];
let nextId = 1;
/**
* The **EtherscanBaseProvider** is the super-class of
* [[EtherscanProvider]], which should generally be used instead.
*
* Since the **EtherscanProvider** includes additional code for
* [[Contract]] access, in //rare cases// that contracts are not
* used, this class can reduce code size.
*
* @_docloc: api/providers/thirdparty:Etherscan
*/
export class EtherscanProvider extends AbstractProvider {
/**
* The connected network.
*/
readonly network!: Network;
/**
* The API key or null if using the community provided bandwidth.
*/
readonly apiKey!: null | string;
readonly #plugin: null | EtherscanPlugin;
/**
* Creates a new **EtherscanBaseProvider**.
*/
constructor(_network?: Networkish, _apiKey?: string) {
const apiKey = (_apiKey != null) ? _apiKey: null;
super();
const network = Network.from(_network);
this.#plugin = network.getPlugin<EtherscanPlugin>(EtherscanPluginId);
defineProperties<EtherscanProvider>(this, { apiKey, network });
// Test that the network is supported by Etherscan
this.getBaseUrl();
}
/**
* Returns the base URL.
*
* If an [[EtherscanPlugin]] is configured on the
* [[EtherscanBaseProvider_network]], returns the plugin's
* baseUrl.
*/
getBaseUrl(): string {
if (this.#plugin) { return this.#plugin.baseUrl; }
switch(this.network.name) {
case "mainnet":
return "https:/\/api.etherscan.io";
case "goerli":
return "https:/\/api-goerli.etherscan.io";
case "sepolia":
return "https:/\/api-sepolia.etherscan.io";
case "holesky":
return "https:/\/api-holesky.etherscan.io";
case "arbitrum":
return "https:/\/api.arbiscan.io";
case "arbitrum-goerli":
return "https:/\/api-goerli.arbiscan.io";
case "base":
return "https:/\/api.basescan.org";
case "base-sepolia":
return "https:/\/api-sepolia.basescan.org";
case "bnb":
return "https:/\/api.bscscan.com";
case "bnbt":
return "https:/\/api-testnet.bscscan.com";
case "matic":
return "https:/\/api.polygonscan.com";
case "matic-amoy":
return "https:/\/api-amoy.polygonscan.com";
case "matic-mumbai":
return "https:/\/api-testnet.polygonscan.com";
case "optimism":
return "https:/\/api-optimistic.etherscan.io";
case "optimism-goerli":
return "https:/\/api-goerli-optimistic.etherscan.io";
default:
}
assertArgument(false, "unsupported network", "network", this.network);
}
/**
* Returns the URL for the %%module%% and %%params%%.
*/
getUrl(module: string, params: Record<string, string>): string {
const query = Object.keys(params).reduce((accum, key) => {
const value = params[key];
if (value != null) {
accum += `&${ key }=${ value }`
}
return accum
}, "");
const apiKey = ((this.apiKey) ? `&apikey=${ this.apiKey }`: "");
return `${ this.getBaseUrl() }/api?module=${ module }${ query }${ apiKey }`;
}
/**
* Returns the URL for using POST requests.
*/
getPostUrl(): string {
return `${ this.getBaseUrl() }/api`;
}
/**
* Returns the parameters for using POST requests.
*/
getPostData(module: string, params: Record<string, any>): Record<string, any> {
params.module = module;
params.apikey = this.apiKey;
return params;
}
async detectNetwork(): Promise<Network> {
return this.network;
}
/**
* Resolves to the result of calling %%module%% with %%params%%.
*
* If %%post%%, the request is made as a POST request.
*/
async fetch(module: string, params: Record<string, any>, post?: boolean): Promise<any> {
const id = nextId++;
const url = (post ? this.getPostUrl(): this.getUrl(module, params));
const payload = (post ? this.getPostData(module, params): null);
this.emit("debug", { action: "sendRequest", id, url, payload: payload });
const request = new FetchRequest(url);
request.setThrottleParams({ slotInterval: 1000 });
request.retryFunc = (req, resp, attempt: number) => {
if (this.isCommunityResource()) {
showThrottleMessage("Etherscan");
}
return Promise.resolve(true);
};
request.processFunc = async (request, response) => {
const result = response.hasBody() ? JSON.parse(toUtf8String(response.body)): { };
const throttle = ((typeof(result.result) === "string") ? result.result: "").toLowerCase().indexOf("rate limit") >= 0;
if (module === "proxy") {
// This JSON response indicates we are being throttled
if (result && result.status == 0 && result.message == "NOTOK" && throttle) {
this.emit("debug", { action: "receiveError", id, reason: "proxy-NOTOK", error: result });
response.throwThrottleError(result.result, THROTTLE);
}
} else {
if (throttle) {
this.emit("debug", { action: "receiveError", id, reason: "null result", error: result.result });
response.throwThrottleError(result.result, THROTTLE);
}
}
return response;
};
if (payload) {
request.setHeader("content-type", "application/x-www-form-urlencoded; charset=UTF-8");
request.body = Object.keys(payload).map((k) => `${ k }=${ payload[k] }`).join("&");
}
const response = await request.send();
try {
response.assertOk();
} catch (error) {
this.emit("debug", { action: "receiveError", id, error, reason: "assertOk" });
assert(false, "response error", "SERVER_ERROR", { request, response });
}
if (!response.hasBody()) {
this.emit("debug", { action: "receiveError", id, error: "missing body", reason: "null body" });
assert(false, "missing response", "SERVER_ERROR", { request, response });
}
const result = JSON.parse(toUtf8String(response.body));
if (module === "proxy") {
if (result.jsonrpc != "2.0") {
this.emit("debug", { action: "receiveError", id, result, reason: "invalid JSON-RPC" });
assert(false, "invalid JSON-RPC response (missing jsonrpc='2.0')", "SERVER_ERROR", { request, response, info: { result } });
}
if (result.error) {
this.emit("debug", { action: "receiveError", id, result, reason: "JSON-RPC error" });
assert(false, "error response", "SERVER_ERROR", { request, response, info: { result } });
}
this.emit("debug", { action: "receiveRequest", id, result });
return result.result;
} else {
// getLogs, getHistory have weird success responses
if (result.status == 0 && (result.message === "No records found" || result.message === "No transactions found")) {
this.emit("debug", { action: "receiveRequest", id, result });
return result.result;
}
if (result.status != 1 || (typeof(result.message) === "string" && !result.message.match(/^OK/))) {
this.emit("debug", { action: "receiveError", id, result });
assert(false, "error response", "SERVER_ERROR", { request, response, info: { result } });
}
this.emit("debug", { action: "receiveRequest", id, result });
return result.result;
}
}
/**
* Returns %%transaction%% normalized for the Etherscan API.
*/
_getTransactionPostData(transaction: TransactionRequest): Record<string, string> {
const result: Record<string, string> = { };
for (let key in transaction) {
if (skipKeys.indexOf(key) >= 0) { continue; }
if ((<any>transaction)[key] == null) { continue; }
let value = (<any>transaction)[key];
if (key === "type" && value === 0) { continue; }
if (key === "blockTag" && value === "latest") { continue; }
// Quantity-types require no leading zero, unless 0
if ((<any>{ type: true, gasLimit: true, gasPrice: true, maxFeePerGs: true, maxPriorityFeePerGas: true, nonce: true, value: true })[key]) {
value = toQuantity(value);
} else if (key === "accessList") {
value = "[" + accessListify(value).map((set) => {
return `{address:"${ set.address }",storageKeys:["${ set.storageKeys.join('","') }"]}`;
}).join(",") + "]";
} else if (key === "blobVersionedHashes") {
if (value.length === 0) { continue; }
// @TODO: update this once the API supports blobs
assert(false, "Etherscan API does not support blobVersionedHashes", "UNSUPPORTED_OPERATION", {
operation: "_getTransactionPostData",
info: { transaction }
});
} else {
value = hexlify(value);
}
result[key] = value;
}
return result;
}
/**
* Throws the normalized Etherscan error.
*/
_checkError(req: PerformActionRequest, error: Error, transaction: any): never {
// Pull any message out if, possible
let message = "";
if (isError(error, "SERVER_ERROR")) {
// Check for an error emitted by a proxy call
try {
message = (<any>error).info.result.error.message;
} catch (e) { }
if (!message) {
try {
message = (<any>error).info.message;
} catch (e) { }
}
}
if (req.method === "estimateGas") {
if (!message.match(/revert/i) && message.match(/insufficient funds/i)) {
assert(false, "insufficient funds", "INSUFFICIENT_FUNDS", {
transaction: req.transaction
});
}
}
if (req.method === "call" || req.method === "estimateGas") {
if (message.match(/execution reverted/i)) {
let data = "";
try {
data = (<any>error).info.result.error.data;
} catch (error) { }
const e = AbiCoder.getBuiltinCallException(req.method, <any>req.transaction, data);
e.info = { request: req, error }
throw e;
}
}
if (message) {
if (req.method === "broadcastTransaction") {
const transaction = Transaction.from(req.signedTransaction);
if (message.match(/replacement/i) && message.match(/underpriced/i)) {
assert(false, "replacement fee too low", "REPLACEMENT_UNDERPRICED", {
transaction
});
}
if (message.match(/insufficient funds/)) {
assert(false, "insufficient funds for intrinsic transaction cost", "INSUFFICIENT_FUNDS", {
transaction
});
}
if (message.match(/same hash was already imported|transaction nonce is too low|nonce too low/)) {
assert(false, "nonce has already been used", "NONCE_EXPIRED", {
transaction
});
}
}
}
// Something we could not process
throw error;
}
async _detectNetwork(): Promise<Network> {
return this.network;
}
async _perform(req: PerformActionRequest): Promise<any> {
switch (req.method) {
case "chainId":
return this.network.chainId;
case "getBlockNumber":
return this.fetch("proxy", { action: "eth_blockNumber" });
case "getGasPrice":
return this.fetch("proxy", { action: "eth_gasPrice" });
case "getPriorityFee":
// This is temporary until Etherscan completes support
if (this.network.name === "mainnet") {
return "1000000000";
} else if (this.network.name === "optimism") {
return "1000000";
} else {
throw new Error("fallback onto the AbstractProvider default");
}
/* Working with Etherscan to get this added:
try {
const test = await this.fetch("proxy", {
action: "eth_maxPriorityFeePerGas"
});
console.log(test);
return test;
} catch (e) {
console.log("DEBUG", e);
throw e;
}
*/
/* This might be safe; but due to rounding neither myself
or Etherscan are necessarily comfortable with this. :)
try {
const result = await this.fetch("gastracker", { action: "gasoracle" });
console.log(result);
const gasPrice = parseUnits(result.SafeGasPrice, "gwei");
const baseFee = parseUnits(result.suggestBaseFee, "gwei");
const priorityFee = gasPrice - baseFee;
if (priorityFee < 0) { throw new Error("negative priority fee; defer to abstract provider default"); }
return priorityFee;
} catch (error) {
console.log("DEBUG", error);
throw error;
}
*/
case "getBalance":
// Returns base-10 result
return this.fetch("account", {
action: "balance",
address: req.address,
tag: req.blockTag
});
case "getTransactionCount":
return this.fetch("proxy", {
action: "eth_getTransactionCount",
address: req.address,
tag: req.blockTag
});
case "getCode":
return this.fetch("proxy", {
action: "eth_getCode",
address: req.address,
tag: req.blockTag
});
case "getStorage":
return this.fetch("proxy", {
action: "eth_getStorageAt",
address: req.address,
position: req.position,
tag: req.blockTag
});
case "broadcastTransaction":
return this.fetch("proxy", {
action: "eth_sendRawTransaction",
hex: req.signedTransaction
}, true).catch((error) => {
return this._checkError(req, <Error>error, req.signedTransaction);
});
case "getBlock":
if ("blockTag" in req) {
return this.fetch("proxy", {
action: "eth_getBlockByNumber",
tag: req.blockTag,
boolean: (req.includeTransactions ? "true": "false")
});
}
assert(false, "getBlock by blockHash not supported by Etherscan", "UNSUPPORTED_OPERATION", {
operation: "getBlock(blockHash)"
});
case "getTransaction":
return this.fetch("proxy", {
action: "eth_getTransactionByHash",
txhash: req.hash
});
case "getTransactionReceipt":
return this.fetch("proxy", {
action: "eth_getTransactionReceipt",
txhash: req.hash
});
case "call": {
if (req.blockTag !== "latest") {
throw new Error("EtherscanProvider does not support blockTag for call");
}
const postData = this._getTransactionPostData(req.transaction);
postData.module = "proxy";
postData.action = "eth_call";
try {
return await this.fetch("proxy", postData, true);
} catch (error) {
return this._checkError(req, <Error>error, req.transaction);
}
}
case "estimateGas": {
const postData = this._getTransactionPostData(req.transaction);
postData.module = "proxy";
postData.action = "eth_estimateGas";
try {
return await this.fetch("proxy", postData, true);
} catch (error) {
return this._checkError(req, <Error>error, req.transaction);
}
}
/*
case "getLogs": {
// Needs to complain if more than one address is passed in
const args: Record<string, any> = { action: "getLogs" }
if (params.filter.fromBlock) {
args.fromBlock = checkLogTag(params.filter.fromBlock);
}
if (params.filter.toBlock) {
args.toBlock = checkLogTag(params.filter.toBlock);
}
if (params.filter.address) {
args.address = params.filter.address;
}
// @TODO: We can handle slightly more complicated logs using the logs API
if (params.filter.topics && params.filter.topics.length > 0) {
if (params.filter.topics.length > 1) {
logger.throwError("unsupported topic count", Logger.Errors.UNSUPPORTED_OPERATION, { topics: params.filter.topics });
}
if (params.filter.topics.length === 1) {
const topic0 = params.filter.topics[0];
if (typeof(topic0) !== "string" || topic0.length !== 66) {
logger.throwError("unsupported topic format", Logger.Errors.UNSUPPORTED_OPERATION, { topic0: topic0 });
}
args.topic0 = topic0;
}
}
const logs: Array<any> = await this.fetch("logs", args);
// Cache txHash => blockHash
let blocks: { [tag: string]: string } = {};
// Add any missing blockHash to the logs
for (let i = 0; i < logs.length; i++) {
const log = logs[i];
if (log.blockHash != null) { continue; }
if (blocks[log.blockNumber] == null) {
const block = await this.getBlock(log.blockNumber);
if (block) {
blocks[log.blockNumber] = block.hash;
}
}
log.blockHash = blocks[log.blockNumber];
}
return logs;
}
*/
default:
break;
}
return super._perform(req);
}
async getNetwork(): Promise<Network> {
return this.network;
}
/**
* Resolves to the current price of ether.
*
* This returns ``0`` on any network other than ``mainnet``.
*/
async getEtherPrice(): Promise<number> {
if (this.network.name !== "mainnet") { return 0.0; }
return parseFloat((await this.fetch("stats", { action: "ethprice" })).ethusd);
}
/**
* Resolves to a [Contract]] for %%address%%, using the
* Etherscan API to retreive the Contract ABI.
*/
async getContract(_address: string): Promise<null | Contract> {
let address = this._getAddress(_address);
if (isPromise(address)) { address = await address; }
try {
const resp = await this.fetch("contract", {
action: "getabi", address });
const abi = JSON.parse(resp);
return new Contract(address, abi, this);
} catch (error) {
return null;
}
}
isCommunityResource(): boolean {
return (this.apiKey == null);
}
}
|