@aws/web3-ws-provider

This is an NPM package that takes care of Signature Version 4 authentication for websocket connections to Ethereum nodes on Amazon Managed Blockchain.

Installing

Install and save as a dependency using NPM: npm install @aws/web3-ws-provider --save

Example

This example assumes that your AWS IAM-related environment variables have been set previously. For example:

export AWS_ACCESS_KEY_ID=...
export AWS_SECRET_ACCESS_KEY=...

# if your IAM credentials are temporary:
export AWS_SESSION_TOKEN=...

const Web3 = require('web3');
const AWSWebsocketProvider = require('@aws/web3-ws-provider');
const endpoint = 'wss://nd-NODEID.wss.ethereum.managedblockchain.REGION.amazonaws.com';
const web3 = new Web3(new AWSWebsocketProvider(endpoint));
web3.eth.getNodeInfo().then(console.log).then(() => {
  web3.currentProvider.connection.close();
});

You may also provide your credentials directly to the constructor arguments of a new instance of AWSWebsocketProvider() using the clientConfig options object:

const Web3 = require('web3');
const AWSWebsocketProvider = require('@aws/web3-ws-provider');

const credentials = {
  accessKeyId: process.env.AWS_ACCESS_KEY_ID, 
  secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY
};
const endpoint = 'wss://nd-NODEID.wss.ethereum.managedblockchain.REGION.amazonaws.com';
const web3 = new Web3(new AWSWebsocketProvider(endpoint, { clientConfig: { credentials: credentials }}));
web3.eth.getNodeInfo().then(console.log).then(() => {
  web3.currentProvider.connection.close();
});

This reusable WS provider can be used to create a valid WS provider in the popular Ethers.js library:

In your project's root directory, install ethers: npm install ethers --save

const ethers = require('ethers');
const AWSWebsocketProvider = require('@aws/web3-ws-provider');

const credentials = {
  accessKeyId: process.env.AWS_ACCESS_KEY_ID, 
  secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY
};
const endpoint = 'wss://nd-NODEID.wss.ethereum.managedblockchain.REGION.amazonaws.com';
const baseProvider = new AWSWebsocketProvider(endpoint, { clientConfig: { credentials: credentials }}));
let provider = new ethers.providers.WebSocketProvider(baseProvider);

Testing

To test this package, follow the instructions in test/README.

Security

See CONTRIBUTING for more information.

License

This library is licensed under the LGPL-3.0 License.