ethers.js/src.ts/providers/provider-alchemy.ts
2022-09-08 23:21:08 -04:00

115 lines
3.6 KiB
TypeScript

import {
defineProperties, FetchRequest, throwArgumentError, throwError
} from "../utils/index.js";
import { showThrottleMessage } from "./community.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";
const defaultApiKey = "_gg7wSSi0KMBsdKnGVfHDueq6xMB9EkC"
function getHost(name: string): string {
switch(name) {
case "homestead":
return "eth-mainnet.alchemyapi.io";
case "ropsten":
return "eth-ropsten.alchemyapi.io";
case "rinkeby":
return "eth-rinkeby.alchemyapi.io";
case "goerli":
return "eth-goerli.alchemyapi.io";
case "kovan":
return "eth-kovan.alchemyapi.io";
case "matic":
return "polygon-mainnet.g.alchemy.com";
case "maticmum":
return "polygon-mumbai.g.alchemy.com";
case "arbitrum":
return "arb-mainnet.g.alchemy.com";
case "arbitrum-rinkeby":
return "arb-rinkeby.g.alchemy.com";
case "optimism":
return "opt-mainnet.g.alchemy.com";
case "optimism-kovan":
return "opt-kovan.g.alchemy.com";
}
return throwArgumentError("unsupported network", "network", name);
}
export class AlchemyProvider extends JsonRpcProvider implements CommunityResourcable {
readonly apiKey!: string;
constructor(_network: Networkish = "homestead", apiKey?: null | string) {
const network = Network.from(_network);
if (apiKey == null) { apiKey = defaultApiKey; }
const request = AlchemyProvider.getRequest(network, apiKey);
super(request, network, { staticNetwork: network });
defineProperties<AlchemyProvider>(this, { apiKey });
}
_getProvider(chainId: number): AbstractProvider {
try {
return new AlchemyProvider(chainId, this.apiKey);
} catch (error) { }
return super._getProvider(chainId);
}
async _perform(req: PerformActionRequest): Promise<any> {
// https://docs.alchemy.com/reference/trace-transaction
if (req.method === "getTransactionResult") {
const trace = await this.send("trace_transaction", [ req.hash ]);
if (trace == null) { return null; }
let data: undefined | string;
let error = false;
try {
data = trace[0].result.output;
error = (trace[0].error === "Reverted");
} catch (error) { }
if (data) {
if (error) {
throwError("an error occurred during transaction executions", "CALL_EXCEPTION", {
data
});
}
return data;
}
return throwError("could not parse trace result", "BAD_DATA", { value: trace });
}
return await super._perform(req);
}
isCommunityResource(): boolean {
return (this.apiKey === defaultApiKey);
}
static getRequest(network: Network, apiKey?: string): FetchRequest {
if (apiKey == null) { apiKey = defaultApiKey; }
const request = new FetchRequest(`https:/\/${ getHost(network.name) }/v2/${ apiKey }`);
request.allowGzip = true;
if (apiKey === defaultApiKey) {
request.retryFunc = async (request, response, attempt) => {
showThrottleMessage("alchemy");
return true;
}
}
return request;
}
}