🚀 zkSync Era In-Memory Node 🚀

This crate provides an in-memory node that supports forking the state from other networks.

The goal of this crate is to offer a fast solution for integration testing, bootloader and system contract testing, and prototyping.

🔗 For a detailed walkthrough, refer to the official documentation.

📌 Overview

The In-Memory Node is designed for local testing and uses an in-memory database for storing state information. It also employs simplified hashmaps for tracking blocks and transactions. When in fork mode, it fetches missing storage data from a remote source if not available locally. Additionally, it uses the remote server (openchain) to resolve the ABI and topics to human-readable names.

⚠️ Caution

Please note that era-test-node is still in its alpha stage. Some features might not be fully supported yet and may not work as intended. However, it is open-sourced, and contributions are welcome!

📊 Limitations & Features

🚫 Limitations	✅ Features
No communication between Layer 1 and Layer 2.	Can fork the state of mainnet, testnet, or custom network.
Many APIs are not yet implemented.	Can replay existing mainnet or testnet transactions.
No support for accessing historical data.	Uses local bootloader and system contracts.
Only one transaction allowed per Layer 1 batch.	Operates deterministically in non-fork mode.
Fixed values returned for zk Gas estimation.	Starts up quickly with pre-configured 'rich' accounts.
Redeploy requires MetaMask cache reset.	Supports hardhat's console.log debugging.
	Resolves names of ABI functions and Events using openchain.

🛠 Prerequisites

1. Rust: era-test-node is written in Rust. Ensure you have Rust installed on your machine. Download Rust here.

2. Other Dependencies: This crate relies on rocksDB. If you face any compile errors due to rocksDB, install the necessary dependencies with:

   apt-get install -y cmake pkg-config libssl-dev clang

📥 Installation & Setup

1. Download era-test-node from latest Release

2. Extract the binary and mark as executable:

   tar xz -f era_test_node.tar.gz -C /usr/local/bin/
   chmod +x /usr/local/bin/era_test_node

3. Start the node:

   era_test_node run

🧑‍💻 Running Locally

1. Compile Rust project and start the node:

   make run

📄 System Contracts

The system contract within the node can be specified via the --dev-system-contracts option. It can take one of the following options:

• built-in: Use the compiled built-in contracts
• built-in-no-verify: Use the compiled built-in contracts, but without signature verification
• local: Load contracts from ZKSYNC_HOME

📃 Logging

The node may be started in either of debug, info, warn or error logging levels via the --log option:

era_test_node --log=error run

Additionally, the file path can be provided via the --log-file-path option (defaults to ./era_test_node.log):

era_test_node --log=error --log-file-path=run.log run

The logging can be configured during runtime via the config_setLogLevel and config_setLogging methods.

📃 Caching

The node will cache certain network request by default to disk in the .cache directory. Alternatively the caching can be disabled or set to in-memory only via the --cache=none|memory|disk parameter.

era_test_node --cache=none run

era_test_node --cache=memory run

Additionally when using --cache=disk, the cache directory may be specified via --cache-dir and the cache may be reset on startup via --reset-cache parameters.

era_test_node --cache=disk --cache-dir=/tmp/foo --reset-cache run

🌐 Network Details

• L2 RPC: http://localhost:8011
• Network Id: 260

Note: The existing implementation does not support communication with Layer 1. As a result, an L1 RPC is not available.

🍴 Forking Networks

To fork the mainnet:

era_test_node fork mainnet

Tip: You can also fork the testnet with era_test_node fork testnet.

🔄 Replay Remote Transactions Locally

If you wish to replay a remote transaction locally for deep debugging, use the following command:

era_test_node replay_tx testnet 0x7f039bcbb1490b855be37e74cf2400503ad57f51c84856362f99b0cbf1ef478a

📞 Sending Network Calls

You can send network calls against a running era-test-node. For example, to check the testnet LINK balance or mainnet USDT, use curl or foundry-zksync.

curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x40609141Db628BeEE3BfAB8034Fc2D8278D0Cc78", "data":"0x06fdde03"}, "latest"],"id":1}' http://localhost:8011

🔍 Seeing more details of the transactions

By default, the tool is just printing the basic information about the executed transactions (like status, gas used etc).

But with --show-calls flag, it can print more detailed call traces, and with --resolve-hashes, it will ask openchain for ABI names.

era_test_node --show-calls=user --resolve-hashes replay_tx testnet 0x7f039bcbb1490b855be37e74cf2400503ad57f51c84856362f99b0cbf1ef478a

Executing 0x7f039bcbb1490b855be37e74cf2400503ad57f51c84856362f99b0cbf1ef478a
┌─────────────────────────┐
│   TRANSACTION SUMMARY   │
└─────────────────────────┘
Transaction: SUCCESS
Initiator: 0x55362182242a4de20ea8a0ec055b2134bb24e23d
Payer: 0x55362182242a4de20ea8a0ec055b2134bb24e23d
Gas - Limit: 797128 | Used: 351250 | Refunded: 445878

==== Console logs: 

==== 18 call traces.  Use --show-calls flag or call config_setShowCalls to display more info.
Call(Normal) 0x55362182242a4de20ea8a0ec055b2134bb24e23d           validateTransaction(bytes32, bytes32, tuple)   730485
  Call(Normal) 0x0000000000000000000000000000000000000001                 0xbb1e83e6   698040
Call(Normal) 0x55362182242a4de20ea8a0ec055b2134bb24e23d           payForTransaction(bytes32, bytes32, tuple)   703647
Call(Normal) 0x55362182242a4de20ea8a0ec055b2134bb24e23d           executeTransaction(bytes32, bytes32, tuple)   647199
    Call(Mimic) 0x6eef3310e09df3aa819cc2aa364d4f3ad2e6ffe3           swapExactETHForTokens(uint256,address[],address,uint256)   596358
      Call(Normal) 0x053f26a020de152a947b8ba7d8974c85c5fc5b81           getPair(address,address)   577647

You can use the following options to get more granular information during transaction processing:

• --show-storage-logs <SHOW_STORAGE_LOGS>: Show storage log information.
  [default: none]
  [possible values: none, read, write, all]

• --show-vm-details <SHOW_VM_DETAILS>: Show VM details information.
  [default: none]
  [possible values: none, all]

• --show-gas-details <SHOW_GAS_DETAILS>: Show Gas details information.
  [default: none]
  [possible values: none, all]

Example:

era_test_node --show-storage-logs=all --show-vm-details=all --show-gas-details=all run

💰 Using Rich Wallets

For testing and development purposes, the era-test-node comes pre-configured with a set of 'rich' wallets. These wallets are loaded with test funds, allowing you to simulate transactions and interactions without the need for real assets.

Here's a list of the available rich wallets:

Account Address	Private Key
0x36615Cf349d7F6344891B1e7CA7C72883F5dc049	0x7726827caac94a7f9e1b160f7ea819f172f7b6f9d2a97f992c38edeab82d4110
0xa61464658AfeAf65CccaaFD3a512b69A83B77618	0xac1e735be8536c6534bb4f17f06f6afc73b2b5ba84ac2cfb12f7461b20c0bbe3
0x0D43eB5B8a47bA8900d84AA36656c92024e9772e	0xd293c684d884d56f8d6abd64fc76757d3664904e309a0645baf8522ab6366d9e
0xA13c10C0D5bd6f79041B9835c63f91de35A15883	0x850683b40d4a740aa6e745f889a6fdc8327be76e122f5aba645a5b02d0248db8
0x8002cD98Cfb563492A6fB3E7C8243b7B9Ad4cc92	0xf12e28c0eb1ef4ff90478f6805b68d63737b7f33abfa091601140805da450d93
0x4F9133D1d3F50011A6859807C837bdCB31Aaab13	0xe667e57a9b8aaa6709e51ff7d093f1c5b73b63f9987e4ab4aa9a5c699e024ee8
0xbd29A1B981925B94eEc5c4F1125AF02a2Ec4d1cA	0x28a574ab2de8a00364d5dd4b07c4f2f574ef7fcc2a86a197f65abaec836d1959
0xedB6F5B4aab3dD95C7806Af42881FF12BE7e9daa	0x74d8b3a188f7260f67698eb44da07397a298df5427df681ef68c45b34b61f998
0xe706e60ab5Dc512C36A4646D719b889F398cbBcB	0xbe79721778b48bcc679b78edac0ce48306a8578186ffcb9f2ee455ae6efeace1
0xE90E12261CCb0F3F7976Ae611A29e84a6A85f424	0x3eb15da85647edd9a1159a4a13b9e7c56877c4eb33f614546d4db06a51868b1c

Feel free to use these wallets in your tests, but remember, they are for development purposes only and should not be used in production or with real assets.

🔧 Supported APIs

See our list of Supported APIs here.

🤖 CI/CD Testing with GitHub Actions

A GitHub Action is available for integrating era-test-node into your CI/CD environments. This action offers high configurability and streamlines the process of testing your applications in an automated way.

You can find this GitHub Action in the marketplace here.

📝 Example Usage

Below is an example yaml configuration to use the era-test-node GitHub Action in your workflow:

name: Run Era Test Node Action

on:
  push:
    branches: [ main ]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
    - name: Checkout code
      uses: actions/checkout@v2

    - name: Run Era Test Node
      uses: dutterbutter/era-test-node-action@latest

🤝 Contributing

We welcome contributions from the community! If you're interested in contributing to the zkSync Era In-Memory Node, please take a look at our CONTRIBUTING.md for guidelines and details on the process.

Thank you for making zkSync Era In-Memory Node better! 🙌