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* [[link-chainstack]] provides a third-party service for connecting to
* various blockchains over JSON-RPC.
*
* **Supported Networks**
*
* - Ethereum Mainnet (``mainnet``)
* - Arbitrum (``arbitrum``)
* - BNB Smart Chain Mainnet (``bnb``)
* - Polygon (``matic``)
*
* @_subsection: api/providers/thirdparty:Chainstack [providers-chainstack]
*/
import {
defineProperties, FetchRequest, assertArgument
} from "../utils/index.js";
import { showThrottleMessage } from "./community.js";
import { Network } from "./network.js";
import { JsonRpcProvider } from "./provider-jsonrpc.js";
import type { AbstractProvider } from "./abstract-provider.js";
import type { CommunityResourcable } from "./community.js";
import type { Networkish } from "./network.js";
function getApiKey(name: string): string {
switch (name) {
case "mainnet": return "39f1d67cedf8b7831010a665328c9197";
case "arbitrum": return "0550c209db33c3abf4cc927e1e18cea1"
case "bnb": return "98b5a77e531614387366f6fc5da097f8";
case "matic": return "cd9d4d70377471aa7c142ec4a4205249";
}
assertArgument(false, "unsupported network", "network", name);
}
function getHost(name: string): string {
switch(name) {
case "mainnet":
return "ethereum-mainnet.core.chainstack.com";
case "arbitrum":
return "arbitrum-mainnet.core.chainstack.com";
case "bnb":
return "bsc-mainnet.core.chainstack.com";
case "matic":
return "polygon-mainnet.core.chainstack.com";
}
assertArgument(false, "unsupported network", "network", name);
}
/**
* The **ChainstackProvider** connects to the [[link-chainstack]]
* 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-chainstack).
*/
export class ChainstackProvider extends JsonRpcProvider implements CommunityResourcable {
/**
* The API key for the Chainstack connection.
*/
readonly apiKey!: string;
/**
* Creates a new **ChainstackProvider**.
*/
constructor(_network?: Networkish, apiKey?: null | string) {
if (_network == null) { _network = "mainnet"; }
const network = Network.from(_network);
if (apiKey == null) { apiKey = getApiKey(network.name); }
const request = ChainstackProvider.getRequest(network, apiKey);
super(request, network, { staticNetwork: network });
defineProperties<ChainstackProvider>(this, { apiKey });
}
_getProvider(chainId: number): AbstractProvider {
try {
return new ChainstackProvider(chainId, this.apiKey);
} catch (error) { }
return super._getProvider(chainId);
}
isCommunityResource(): boolean {
return (this.apiKey === getApiKey(this._network.name));
}
/**
* Returns a prepared request for connecting to %%network%%
* with %%apiKey%% and %%projectSecret%%.
*/
static getRequest(network: Network, apiKey?: null | string): FetchRequest {
if (apiKey == null) { apiKey = getApiKey(network.name); }
const request = new FetchRequest(`https:/\/${ getHost(network.name) }/${ apiKey }`);
request.allowGzip = true;
if (apiKey === getApiKey(network.name)) {
request.retryFunc = async (request, response, attempt) => {
showThrottleMessage("ChainstackProvider");
return true;
};
}
return request;
}
}
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