83 lines
1.7 KiB
JavaScript
83 lines
1.7 KiB
JavaScript
// @flow
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import BaseNode from './base';
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import { randomBytes } from 'crypto';
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import Big from 'big.js';
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type JsonRpcSuccess = {|
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id: string,
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result: string
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|};
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type JsonRpcError = {|
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error: {
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code: string,
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message: string,
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data?: any
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}
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|};
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type JsonRpcResponse = JsonRpcSuccess | JsonRpcError;
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// FIXME
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type EthCall = any;
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function isError(response) {}
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export default class RPCNode extends BaseNode {
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endpoint: string;
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constructor(endpoint: string) {
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super();
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this.endpoint = endpoint;
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}
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async getBalance(address: string): Promise<Big> {
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return this.post('eth_getBalance', [address, 'pending']).then(response => {
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if (response.error) {
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throw new Error(response.error.message);
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}
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// FIXME is this safe?
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return new Big(Number(response.result));
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});
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}
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// FIXME extract batching
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async ethCall(calls: EthCall[]) {
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return this.batchPost(
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calls.map(params => {
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return {
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id: randomBytes(16).toString('hex'),
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jsonrpc: '2.0',
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method: 'eth_call',
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params: [params, 'pending']
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};
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})
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);
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}
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async post(method: string, params: string[]): Promise<JsonRpcResponse> {
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return fetch(this.endpoint, {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json'
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},
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body: JSON.stringify({
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id: randomBytes(16).toString('hex'),
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jsonrpc: '2.0',
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method,
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params
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})
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}).then(r => r.json());
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}
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// FIXME
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async batchPost(requests: any[]): Promise<JsonRpcResponse[]> {
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return fetch(this.endpoint, {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json'
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},
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body: JSON.stringify(requests)
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}).then(r => r.json());
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}
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}
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