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

You can install the package either using NPM or using Yarn

Using NPM

npm install web3-core-requestmanager

Using Yarn

yarn add 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'));