web3-core-requestmanager

What is web3-core-requestmanager?

The web3-core-requestmanager package is a core component of the Web3.js library, which is used to interact with Ethereum blockchain nodes. It provides the functionality to send JSON-RPC requests to Ethereum nodes and handle the responses. This package is essential for managing the communication between the client application and the Ethereum network.

What are web3-core-requestmanager's main functionalities?

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();

Other packages similar to web3-core-requestmanager

ethers

The ethers.js library is a complete and compact library for interacting with the Ethereum blockchain and its ecosystem. It provides similar functionalities to web3-core-requestmanager, such as sending JSON-RPC requests and managing communication with Ethereum nodes. Ethers.js is known for its simplicity and ease of use.

web3

The web3.js library is a comprehensive library for interacting with the Ethereum blockchain. It includes the web3-core-requestmanager package as one of its core components. Web3.js provides a wide range of functionalities, including sending JSON-RPC requests, managing accounts, and interacting with smart contracts.

ethjs

Ethjs is a lightweight and modular library for interacting with the Ethereum blockchain. It provides similar functionalities to web3-core-requestmanager, such as sending JSON-RPC requests and managing communication with Ethereum nodes. Ethjs is designed to be simple and efficient, making it a good choice for lightweight applications.

README

web3-core-requestmanager

This is a sub-package of web3.js.

This requestmanager package is used by most web3.js packages.

Please read the documentation for more.

Installation

Node.js

npm install web3-core-requestmanager

Usage

const Web3WsProvider = require('web3-providers-ws');
const Web3RequestManager = require('web3-core-requestmanager');

const requestManager = new Web3RequestManager(new Web3WsProvider('ws://localhost:8546'));