Blue-Green Deployment Coordinator for Upgradeable Contracts

WHAT IT DOES

Blue-Green Deployment Coordinator for Upgradeable Contracts streamlines the process of upgrading proxy contracts using the blue-green deployment pattern. It takes a proxy address, the current (blue) implementation address, and the new (green) implementation address, then prepares a deployment plan. The tool checks that all contracts exist on-chain, reads the current implementation from the proxy's storage slot (ERC1967 standard), and verifies that the blue and green implementations are different. It presents a clear review screen showing the current state, the proposed change, and a step-by-step action plan. When you're ready, it constructs and sends the upgradeTo() transaction to the proxy, executing the switch from blue to green. After the transaction is confirmed, it updates the review to show the new state. This tool reduces the risk of manual errors in upgrade transactions by providing visibility, validation, and a structured workflow for one of the most critical operations in upgradeable contract management.

HOW TO USE

Connect your wallet to access the EVM network. Enter the proxy contract address, the current blue implementation address, and the new green implementation address. Optionally specify a deployer address—if left blank, the connected wallet address is used. Click "Prepare Deployment Plan." The tool fetches the current implementation from the proxy's storage, verifies all contracts exist, and builds a review. The review shows the proxy address, deployer, current implementation, both blue and green addresses, and status badges indicating whether the proxy matches blue and whether green is different from blue. If green is different, an "Execute Blue-Green Upgrade" button appears. Click it to send the upgrade transaction. Your wallet will prompt you to confirm the transaction. After confirmation, the tool waits for the receipt and updates the review to reflect the new state. You can then verify that the proxy now points to the green implementation.

THE REAL MECHANISM

The tool uses the ethers.js library to interact with the blockchain. For preparation, it first calls eth_getCode on all three addresses to verify contract existence. It then reads the ERC1967 implementation slot (0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc) using eth_getStorageAt to determine the current implementation address. The review presents this information transparently. For execution, the tool uses the proxy's upgradeTo(address) function via a minimal ABI. It estimates gas using estimateGas and applies a 20% buffer to reduce the risk of out-of-gas errors. The transaction is sent using the wallet's signer, and the tool waits for the receipt to confirm success. If the transaction reverts, the tool captures and displays the revert reason using the reasonOf helper. All data is processed client-side with no external dependencies beyond the RPC provider.

WHAT IT CANNOT SEE

This tool cannot automatically rollback if the new implementation fails during execution—rollback requires a separate manual upgrade transaction. It cannot detect off-chain deployment errors such as incorrect constructor arguments or failed deployment scripts. It cannot verify contract source code on Etherscan or any other block explorer—you must verify your contracts separately. It cannot test the new implementation in isolation before deployment—it assumes you have already deployed and tested the green implementation. It cannot simulate user traffic routing or coordinate traffic shifting between environments. It cannot coordinate across multiple proxy contracts in a single transaction—each proxy requires a separate upgrade call. It cannot detect if the proxy is paused or if the upgrade is blocked by an owner check—it will attempt the call and report the revert reason. The tool does not validate that the green implementation is compatible with the proxy's storage layout—that is your responsibility.

PLEASE NOTE

Blue-Green Deployment Coordinator works exclusively with Ethereum Virtual Machine (EVM) compatible chains including Ethereum, Goerli, Sepolia, Polygon, BSC, Arbitrum, Optimism, Avalanche, and others. It requires the proxy contract to follow the ERC1967 standard or expose an upgradeTo function. The tool reads data and sends transactions, so it requires a connected wallet with sufficient gas funds. All processing occurs client-side in your browser; no data is sent to any external server. The tool is free to use and does not require authentication. Use with caution—upgrading a proxy contract is an irreversible action if the new implementation is faulty.