Infura is a hosted Ethereum node cluster that lets your users run your application without requiring them to set up their own Ethereum node or wallet. Infura behaves just like a local install of Ethereum running RPC.
For security reasons, Infura does not manage your private keys, which means infura cannot sign transactions on your behalf.
However, Truffle can sign transactions through the use of its HDWalletProvider. This provider can handle the transaction signing as well as the connection to the Ethereum network.
Install HDWalletProvider:
npm install truffle-hdwallet-providerBefore you can use Infura, you need to register for an Infura Access Token.
Notice that our INFURA provider URLs are all over SSL. Make sure you use https:// when you send requests to INFURA rather than http:// requests.
Currently, HDWalletProvider manages only one address at a time. It's the first address generated from the mnemonic.
require("babel-register");
require("babel-polyfill");
const HDWalletProvider = require("truffle-hdwallet-provider");
require("dotenv").config();
const mnemonic = "test1 test2 test3 test4 test5 test6 test7 test8 test9 test10 test11 test12";
const ropstenProviderUrl = "https://ropsten.infura.io";
const mainnetProviderUrl = "https://api.myetherapi.com/eth";
const providerRopsten = new HDWalletProvider(mnemonic, ropstenProviderUrl, 0, 50);
const providerMainnet = new HDWalletProvider(mnemonic, mainnetProviderUrl, 0, 50);
module.exports = {
networks: {
development: {
host: "localhost",
port: 8545,
network_id: "*",
gas: 4200000,
gasPrice: 20e9,
},
ganache: {
host: "localhost",
port: 7545,
network_id: "*",
gas: 4200000,
},
ropsten: {
network_id: 3,
provider: providerRopsten,
gas: 4200000,
gasPrice: 30e9,
},
mainnet: {
network_id: 1,
provider: providerMainnet,
gas: 4200000,
gasPrice: 50e9,
},
},
solc: {
optimizer: {
enabled: true,
runs: 200,
},
},
};A
providerlinks to a running node. For example parity or geth. A node has the ability to view and interact with the blockchain. So https://api.myetherapi.com/eth is a provider. Web3 provider is a website running geth or parity node which talks to Ethereum network.
You might quickly recognize that Infura works just fine without adding the Access Token to the URL. That is only partially true. While INFURA will work without identifying your requests, these requests will be subjected to more restrictive throttling and filtering of available JSON-RPC methods.