web3-core-requestmanager

Sending JSON-RPC Requests

This feature allows you to send JSON-RPC requests to an Ethereum node. In this example, a request is sent to get the current block number from the Ethereum node.

const Web3 = require('web3');
const RequestManager = require('web3-core-requestmanager');

const web3 = new Web3('http://localhost:8545');
const requestManager = new RequestManager(web3.currentProvider);

const payload = {
  jsonrpc: '2.0',
  method: 'eth_blockNumber',
  params: [],
  id: 1
};

requestManager.send(payload, (error, result) => {
  if (error) {
    console.error('Error:', error);
  } else {
    console.log('Block Number:', result.result);
  }
});

Batch Requests

This feature allows you to send multiple JSON-RPC requests in a single batch. In this example, two requests are sent: one to get the current block number and another to get the current gas price.

const Web3 = require('web3');
const RequestManager = require('web3-core-requestmanager');

const web3 = new Web3('http://localhost:8545');
const requestManager = new RequestManager(web3.currentProvider);

const batch = new web3.BatchRequest();

batch.add(requestManager.send({
  jsonrpc: '2.0',
  method: 'eth_blockNumber',
  params: [],
  id: 1
}, (error, result) => {
  if (error) {
    console.error('Error:', error);
  } else {
    console.log('Block Number:', result.result);
  }
}));

batch.add(requestManager.send({
  jsonrpc: '2.0',
  method: 'eth_gasPrice',
  params: [],
  id: 2
}, (error, result) => {
  if (error) {
    console.error('Error:', error);
  } else {
    console.log('Gas Price:', result.result);
  }
}));

batch.execute();