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/**
* [[link-blockscout]] provides a third-party service for connecting to
* various blockchains over JSON-RPC.
*
* **Supported Networks**
*
* - Ethereum Mainnet (``mainnet``)
* - Sepolia Testnet (``sepolia``)
* - Holesky Testnet (``holesky``)
* - Ethereum Classic (``classic``)
* - Arbitrum (``arbitrum``)
* - Base (``base``)
* - Base Sepolia Testnet (``base-sepolia``)
* - Gnosis (``xdai``)
* - Optimism (``optimism``)
* - Optimism Sepolia Testnet (``optimism-sepolia``)
* - Polygon (``matic``)
*
* @_subsection: api/providers/thirdparty:Blockscout [providers-blockscout]
*/
import {
assertArgument, defineProperties, FetchRequest, isHexString
} from "../utils/index.js";
import { Network } from "./network.js";
import { JsonRpcProvider } from "./provider-jsonrpc.js";
import type { AbstractProvider, PerformActionRequest } from "./abstract-provider.js";
import type { CommunityResourcable } from "./community.js";
import type { Networkish } from "./network.js";
import type { JsonRpcPayload, JsonRpcError } from "./provider-jsonrpc.js";
function getUrl(name: string): string {
switch(name) {
case "mainnet":
return "https:/\/eth.blockscout.com/api/eth-rpc";
case "sepolia":
return "https:/\/eth-sepolia.blockscout.com/api/eth-rpc";
case "holesky":
return "https:/\/eth-holesky.blockscout.com/api/eth-rpc";
case "classic":
return "https:/\/etc.blockscout.com/api/eth-rpc";
case "arbitrum":
return "https:/\/arbitrum.blockscout.com/api/eth-rpc";
case "base":
return "https:/\/base.blockscout.com/api/eth-rpc";
case "base-sepolia":
return "https:/\/base-sepolia.blockscout.com/api/eth-rpc";
case "matic":
return "https:/\/polygon.blockscout.com/api/eth-rpc";
case "optimism":
return "https:/\/optimism.blockscout.com/api/eth-rpc";
case "optimism-sepolia":
return "https:/\/optimism-sepolia.blockscout.com/api/eth-rpc";
case "xdai":
return "https:/\/gnosis.blockscout.com/api/eth-rpc";
}
assertArgument(false, "unsupported network", "network", name);
}
/**
* The **BlockscoutProvider** connects to the [[link-blockscout]]
* JSON-RPC end-points.
*
* By default, a highly-throttled API key is used, which is
* appropriate for quick prototypes and simple scripts. To
* gain access to an increased rate-limit, it is highly
* recommended to [sign up here](link-blockscout).
*/
export class BlockscoutProvider extends JsonRpcProvider implements CommunityResourcable {
/**
* The API key.
*/
readonly apiKey!: null | string;
/**
* Creates a new **BlockscoutProvider**.
*/
constructor(_network?: Networkish, apiKey?: null | string) {
if (_network == null) { _network = "mainnet"; }
const network = Network.from(_network);
if (apiKey == null) { apiKey = null; }
const request = BlockscoutProvider.getRequest(network);
super(request, network, { staticNetwork: network });
defineProperties<BlockscoutProvider>(this, { apiKey });
}
_getProvider(chainId: number): AbstractProvider {
try {
return new BlockscoutProvider(chainId, this.apiKey);
} catch (error) { }
return super._getProvider(chainId);
}
isCommunityResource(): boolean {
return (this.apiKey === null);
}
getRpcRequest(req: PerformActionRequest): null | { method: string, args: Array<any> } {
// Blockscout enforces the TAG argument for estimateGas
const resp = super.getRpcRequest(req);
if (resp && resp.method === "eth_estimateGas" && resp.args.length == 1) {
resp.args = resp.args.slice();
resp.args.push("latest");
}
return resp;
}
getRpcError(payload: JsonRpcPayload, _error: JsonRpcError): Error {
const error = _error ? _error.error: null;
// Blockscout currently drops the VM result and replaces it with a
// human-readable string, so we need to make it machine-readable.
if (error && error.code === -32015 && !isHexString(error.data || "", true)) {
const panicCodes = <Record<string, string>>{
"assert(false)": "01",
"arithmetic underflow or overflow": "11",
"division or modulo by zero": "12",
"out-of-bounds array access; popping on an empty array": "31",
"out-of-bounds access of an array or bytesN": "32"
};
let panicCode = "";
if (error.message === "VM execution error.") {
// eth_call passes this message
panicCode = panicCodes[error.data] || "";
} else if (panicCodes[error.message || ""]) {
panicCode = panicCodes[error.message || ""];
}
if (panicCode) {
error.message += ` (reverted: ${ error.data })`;
error.data = "0x4e487b7100000000000000000000000000000000000000000000000000000000000000" + panicCode;
}
} else if (error && error.code === -32000) {
if (error.message === "wrong transaction nonce") {
error.message += " (nonce too low)";
}
}
return super.getRpcError(payload, _error);
}
/**
* Returns a prepared request for connecting to %%network%%
* with %%apiKey%%.
*/
static getRequest(network: Network): FetchRequest {
const request = new FetchRequest(getUrl(network.name));
request.allowGzip = true;
return request;
}
}
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