67 lines
2.1 KiB
JavaScript
67 lines
2.1 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.getProvider = exports.fetchFromProvider = void 0;
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/**
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* Makes a simple RPC call to a remote Ethereum JSON-RPC provider and passes through the response.
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* No parameter or response validation is done.
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*
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* @param url the URL for the JSON RPC provider
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* @param params the parameters for the JSON-RPC method - refer to
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* https://ethereum.org/en/developers/docs/apis/json-rpc/ for details on RPC methods
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* @returns the `result` field from the JSON-RPC response
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* @example
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* ```ts
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* const provider = 'https://mainnet.infura.io/v3/...'
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* const params = {
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* method: 'eth_getBlockByNumber',
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* params: ['latest', false],
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* }
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* const block = await fetchFromProvider(provider, params)
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* ```
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*/
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const fetchFromProvider = async (url, params) => {
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const data = JSON.stringify({
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method: params.method,
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params: params.params,
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jsonrpc: '2.0',
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id: 1,
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});
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const res = await fetch(url, {
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headers: {
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'content-type': 'application/json',
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},
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method: 'POST',
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body: data,
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});
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if (!res.ok) {
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throw new Error(`JSONRpcError: ${JSON.stringify({
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method: params.method,
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status: res.status,
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message: await res.text().catch(() => {
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return 'Could not parse error message likely because of a network error';
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}),
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}, null, 2)}`);
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}
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const json = await res.json();
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// TODO we should check json.error here
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return json.result;
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};
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exports.fetchFromProvider = fetchFromProvider;
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/**
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*
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* @param provider a URL string or {@link EthersProvider}
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* @returns the extracted URL string for the JSON-RPC Provider
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*/
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const getProvider = (provider) => {
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if (typeof provider === 'string') {
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return provider;
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}
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else if (typeof provider === 'object' && provider._getConnection !== undefined) {
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return provider._getConnection().url;
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}
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else {
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throw new Error('Must provide valid provider URL or Web3Provider');
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}
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};
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exports.getProvider = getProvider;
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//# sourceMappingURL=provider.js.map
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