evmdeploy

A lightweight, configuration-driven Python library for compiling and deploying Solidity smart contracts to EVM-compatible blockchains.

Table of Contents

• Features
• Installation
• Setup
• Quick Start
• Core Components
  • SolidityCompiler
  • Contract
  • ArtifactStorage
  • Network Support
• Examples
• Troubleshooting
• License

---

Features

• Configuration-Driven Compilation: Define compiler versions, path remappings, and optimizer settings once using the SolidityCompiler object.
• Unified Contract API: The Contract class encapsulates ABI, bytecode, and deployment behavior in a single interface.
• Automated Deployment Flow: Built-in support for nonce management, EIP-1559 gas estimation, and transaction confirmations.
• Artifact Persistence: Save and load compiled contracts via JSON to eliminate redundant compilation steps.
• OpenZeppelin Support: Easily handle library imports with customizable path remappings.
• Multi-Chain Support: Pre-configured network settings for Ethereum Mainnet, Sepolia, Polygon, and Amoy.

Installation

You can install evmdeploy directly from PyPI:

pip install evmdeploy

Manual Installation

If you are working with the source code or want to install from the repository:

1. Clone the repository:

git clone https://github.com/rakibhossain72/evmdeploy.git
cd evmdeploy

2. Install dependencies:

pip install -r requirements.txt

3. Install the package in editable mode:

pip install -e .

Setup

The library integrates with python-dotenv for managing sensitive credentials. Create a .env file in your project root:

PRIVATE_KEY=0xyour_private_key_here
RPC_URL=https://sepolia.infura.io/v3/your_project_id

Quick Start

The following example demonstrates a complete workflow from compilation to deployment.

import os
from web3 import Web3
from dotenv import load_dotenv
from evmdeploy import SolidityCompiler, Contract

# Load credentials
load_dotenv()

# 1. Configure and Compile
compiler = SolidityCompiler(solc_version="0.8.23", optimizer=True, runs=500)
artifacts = compiler.compile("contracts/Vault.sol")
vault = Contract(artifacts["Vault"])

# 2. Setup Web3 connection
w3 = Web3(Web3.HTTPProvider(os.getenv("RPC_URL")))

# 3. Deploy Contract
# The deploy() method handles gas estimation, nonces, and waiting for confirmation.
result = vault.deploy(
    w3=w3,
    private_key=os.getenv("PRIVATE_KEY"),
    constructor_args=["0x70997970C51812dc3A010C7d01b50e0d17dc79C8"]
)

print(f"Contract Address: {result.contract_address}")
print(f"Transaction Hash: {result.tx_hash}")

# 4. Save Artifact for future use
vault.save(base_path="artifacts")

---

Core Components

SolidityCompiler

The SolidityCompiler class allows you to pre-define your build environment.

• solc_version: The Solidity compiler version (e.g., "0.8.23").
• remappings: Dictionary for import path mapping (e.g., {"@openzeppelin/": "contracts/lib/openzeppelin-contracts/"}).
• optimizer: Boolean to enable Solidity optimizer (default: True).
• runs: Optimizer runs setting (default: 200).

Contract

The primary interface for interacting with your contract's artifacts and lifecycle.

• deploy(...): Performs the full deployment transaction and returns a DeploymentResult.
• save(base_path): Persists the ABI and bytecode to a JSON file.
• from_storage(name, base_path): Class method to load a contract from saved artifacts without recompiling.
• encode_constructor_args(*args, **kwargs): Returns the ABI-encoded data for contract initialization.

ArtifactStorage

Handles reading and writing contract data to the local filesystem.

• save_artifacts(artifacts_dict): Saves multiple artifacts at once.
• load_artifact(name): Retrieves a specific artifact by its contract name.

Network Support

Use get_network(name) to access pre-defined configurations for common EVM chains:

• mainnet
• sepolia
• polygon
• amoy (Polygon Testnet)

from evmdeploy import get_network
network = get_network("sepolia")
print(f"Network: {network.name}, ChainID: {network.chain_id}")

---

Examples

• Standard Deployment: See examples/improved_deploy.py for a standard contract deployment flow.
• OpenZeppelin ERC20: See examples/oz_erc20_deploy.py for an example using external library remappings and constructor arguments.

Troubleshooting

Private Key Not Found

If you receive a message saying Please set the PRIVATE_KEY environment variable, ensure:

1. A .env file exists in the directory where you are executing the script.
2. load_dotenv() is called at the start of your script.
3. Your .env file contains PRIVATE_KEY=0x... without spaces around the =.

Compilation Failures

• Verify that the solc_version in your SolidityCompiler config is installed and matches your contract's pragma.
• Check that remappings paths are correct relative to your execution directory.

License

This project is licensed under the MIT License.