zksync-web3-rs

Table of Contents

• Getting Started with zkSync Web3 SDK
  • Prerequisites
  • Adding dependencies
  • First steps
    • Importing dependencies
    • Creating a Wallet
    • Connecting to the zkSync Network
    • Creating a Payment Transaction
    • Sending the Transaction
    • Checking zkSync account balance
  • Simple Transfer Example
    • Clone the Repository
    • Run a zkSync localnet
    • Run the Simple Transfer Example
  • Conclusion

Getting Started with zkSync Web3 SDK

While most of the existing SDKs should work out of the box, deploying smart contracts or using unique zkSync features, like account abstraction, requires providing additional fields to those that Ethereum transactions have by default.

To provide easy access to all of the features of zkSync Era, the zksync-web3-rs Rust SDK was created, which is made in a way that has an interface very similar to those of ethers. In fact, ethers is a peer dependency of our library and most of the objects exported by zksync-web3-rs (e.g. Provider etc.) inherit from the corresponding ethers objects and override only the fields that need to be changed.

The library is made in such a way that after replacing ethers with zksync-web3-rs most client apps will work out of box.

Prerequisites

Before you begin, make sure you have the following prerequisites:

• Rust: Ensure that Rust is installed on your system. You can install Rust by following the instructions at https://www.rust-lang.org/tools/install.

• Git: Install Git on your system if you haven't already. You can find installation instructions at https://git-scm.com/book/en/v2/Getting-Started-Installing-Git.

• zkSync CLI (only if you want to run a localnet): Install the zkSync CLI on your system

  This particular CLI command uses Docker under the hood, you should also have Docker installed on your system. You can find installation instructions at https://docs.docker.com/get-docker/.

  git clone https://github.com/lambdaclass/zksync-cli.git
  cd zksync-cli
  npm i -g && npm run build
  zksync-cli localnet up

Adding dependencies

Add the following dependencies to your Cargo.toml file:

zksync-web3-rs = { git = "https://www.github.com/lambdaclass/zksync-web3-rs" }

Maybe consider adding tokio as dependency since we are using a lot of async/await functions. If this example is meant to be done in the main function the #[tokio::main] annotation is needed.

First steps

In the following steps, we will show you how to create a payment transaction using the zksync-web3-rs library.

Importing dependencies

Import the zksync-web3-rs library into your project by adding the following line to the top of your main.rs file:

use zksync-web3-rs as zksync;

Creating a Wallet

To create a wallet, you need to provide the private key of the Ethereum account that will be used to sign the transaction. You can create a wallet using the following code:

We set the chain id to 270 because we are using the zkSync Era node. If you want to use the mainnet, you should set the chain id to 9. https://era.zksync.io/docs/api/hardhat/testing.html#connect-wallet-to-local-nodes

use zksync::{Signer, k256::ecdsa::SigningKey};

let private_key: Wallet<SigningKey> = "0x7726827caac94a7f9e1b160f7ea819f172f7b6f9d2a97f992c38edeab82d4110".parse().unwrap();
let zksync_era_chain_id: u64 = 270;

let wallet = zksync::Wallet::with_chain_id(private_key, zksync_era_chain_id);

Connecting to the zkSync Network

To connect to the zkSync network, you need to provide the URL of the zkSync node. The localnet runs both an Ethereum node (L1) on port 8545 and an Era node (L2) on port 3050. You can connect to the zkSync Era network using the following code:

let provider = zksync::Provider::try_from("http://65.21.140.36:3050").unwrap();

Creating a Payment Transaction

To create a payment transaction, you need to provide the sender's address, the receiver's address, and the amount to transfer. You can create a payment transaction using the following code:

use zksync::zks_provider::ZKSProvider;

let sender_address: zksync::Address = "0x36615Cf349d7F6344891B1e7CA7C72883F5dc049".parse().unwrap();
let receiver_address: zksync::Address = "0xa61464658AfeAf65CccaaFD3a512b69A83B77618".parse().unwrap();
let amount_to_transfer = zksync::U256::from(1);

let mut payment_request = zksync::Eip1559TransactionRequest::new()
    .from(sender_address)
    .to(receiver_address)
    .value(amount_to_transfer);

let fee = provider
    .clone()
    .estimate_fee(payment_request.clone())
    .await
    .unwrap();

payment_request = payment_request.max_priority_fee_per_gas(fee.max_priority_fee_per_gas);
payment_request = payment_request.max_fee_per_gas(fee.max_fee_per_gas);

let transaction: zksync::TypedTransaction = payment_request.into();

Sending the Transaction

To send the transaction, you need to provide the wallet and the transaction. You can send the transaction using the following code:

In case you are wondering, the transaction is signed in the send_transaction method.

use zksync::MiddlewareBuilder;

let signer_middleware = provider.clone().with_signer(wallet);

let payment_response: zksync::TransactionReceipt =
    zksync::SignerMiddleware::send_transaction(&signer_middleware, transaction, None)
        .await
        .unwrap()
        .await
        .unwrap()
        .unwrap();

Checking zkSync account balance

let sender_balance = provider
    .get_balance(sender_address, None)
    .await
    .unwrap();

Simple Transfer Example

There's an executable example involving the previous steps in the examples folder. To run the example, follow the steps below:

Clone the Repository

To get started, clone the zksync-web3-rs repository from GitHub. Open a terminal or command prompt and execute the following commands:

git clone https://github.com/lambdaclass/zksync-web3-rs.git
cd zksync-web3-rs

Run a zkSync localnet

To run the zkSync localnet, execute the following command:

zksync-cli localnet up

Run the Simple Transfer Example

To run the payment transaction example using EIP1559 transactions on zkSync Era, run the following command:

make simple_payment HOST=<host> PORT=<port> AMOUNT=<amount_to_transfer> SENDER_ADDRESS=<sender> RECEIVER_ADDRESS=<receiver> PRIVATE_KEY=<pk> NETWORK=<net>

• HOST: The IP address or hostname of the node.
• PORT: The port number of the node.
• AMOUNT: The amount to transfer.
• SENDER_ADDRESS: The address of the sender's Ethereum account, represented in hexadecimal format with the 0x prefix. For example, 0x123abc....
• RECEIVER_ADDRESS: The address of the receiver's Ethereum account, represented in hexadecimal format with the 0x prefix. For example, 0x456def....
• PRIVATE_KEY: The private key of an Ethereum account with sufficient funds to perform the transaction, represented in hexadecimal format with the 0x prefix.
• NETWORK: The network you want to connect to. There are two options: era which will connect to the L2 node and eth which will connect to the L1 node.

Note: Ensure that you have properly configured the environment variables or provided the required values as command-line arguments.

This command executes the simple_payment binary using the provided Makefile.

Conclusion

Congratulations! You have successfully completed the "Getting Started" guide for the zksync-web3-rs SDK. You have learned how to send a simple payment transaction example using EIP1559 transactions on zkSync Era.

By exploring the example code and the repository's documentation, you can further enhance your understanding of interacting with zkSync Era's testnet using the zksync-web3-rs SDK.

Feel free to experiment with different configurations and explore other functionalities provided by the SDK.

If you have any questions or need further assistance, don't hesitate to reach out to the repository's community or maintainers.

Happy coding!